feat(更新依赖): 更新guigo、gmsm

.gitea/workflows/build.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 set -e
 export TZ=Asia/Shanghai
-GOOS=js GOARCH=wasm CGO_ENABLED=0 go build -o assets/webui/ofdgo.wasm -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/wasm.go
+export Version="$(git show -s --format='%ct-%H' HEAD)"
-GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o main -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/webui.go
+GOOS=js GOARCH=wasm CGO_ENABLED=0 go build -o assets/webui/wasm/ofdgo.wasm -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/wasm.go
+GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o main -trimpath -ldflags "-s -w -buildid= -X github.com/xiaoqidun/ofdgo/internal/build.Version=$Version" ./cmd/webui/webui.go

.gitignore

@@ -1,8 +1,9 @@
 .idea/
 .vscode/
 .devcontainer/
+releases/
 go.work
 go.work.sum
-assets/webui/ofdgo.wasm
 *.exe
 *.exe~
+assets/webui/wasm/ofdgo.wasm

Dockerfile

@@ -1,5 +1,5 @@
 # 基础镜像
-FROM alpine:3.24.2
+FROM alpine:3.24.3
 
 # 作者信息
 LABEL authors="肖其顿 (XIAO QI DUN)"

README.md

@@ -3,20 +3,28 @@
 
 # 主要能力
 - 文档处理：创建、读写、拆分、合并、压缩
-- 渲染转换：矢量、位图、导入、导出、批量
+- 文档阅读：搜索、缩放、旋转、双页、连续
-- 文档安全：签名、签章、验签、加密、解密
+- 文档管理：新建、导入、切换、排序、删除
+- 版本管理：创建、改名、切换、另存、删除
 - 页面管理：添加、导入、复制、排序、删除
-- 文字处理：插入、编辑、排版、搜索、提取
+- 文档编辑：选区、重排、事务、撤销、重做
-- 字体处理：内嵌、外置、裁剪、匹配、提取
+- 文字处理：插入、编辑、替换、排版、提取
+- 文字样式：混排、粗体、斜体、阴影、底色
+- 字体处理：匹配、内嵌、外置、子集、提取
 - 图片处理：插入、替换、缩放、裁剪、提取
 - 图形处理：绘制、变换、组合、对齐、分布
-- 文档管理：添加、切换、改名、排序、删除
+- 色彩管理：调色、渐变、图案、透明、转换
-- 版本管理：创建、切换、改名、另存、删除
+- 文档结构：图层、模板、目录、书签、标引
-- 文档结构：目录、书签、模板、标引、扩展
+- 资源管理：导入、绑定、替换、提取、清理
 - 注解管理：批注、高亮、水印、印章、链接
-- 动作管理：跳转、链接、附件、音频、视频
+- 交互动作：跳转、链接、附件、音频、视频
-- 资源管理：字体、图片、色彩、媒体、附件
+- 电子发票：提取、创建、编辑、校验、同步
+- 文档安全：签名、签章、验签、加密、解密
 - 三维处理：解析、材质、纹理、动画、渲染
+- 页面渲染：矢量、位图、裁剪、蒙版、合成
+- 批量转换：选页、并行、进度、取消、打包
+- 打印输出：预览、双面、合印、小册、海报
+- 应用交互：标签、链接、关联、拖放、复用
 
 # 在线使用
 [OFDGo WebUI](https://ofdgo.aite.me/)，将OFDGo编译为WASM提供服务
@@ -50,13 +58,35 @@ docker run -d -p 80:80 ccr.ccs.tencentyun.com/xiaoqidun/ofdgo:latest
 :: 1. 编译OFDGo WASM
 set GOOS=js
 set GOARCH=wasm
-go build -o assets/webui/ofdgo.wasm -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/wasm.go
+go build -o assets/webui/wasm/ofdgo.wasm -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/wasm.go
 :: 2. 编译OFDGo WebUI
 set GOOS=windows
 set GOARCH=amd64
 go build -o ofdgo_webui.exe -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/webui.go
 ```
 
+# 原生桌面
+基于 [GUIGo](https://github.com/xiaoqidun/guigo) 实现，运行前需参照其说明安装系统依赖
+
+```batch
+set CGO_ENABLED=0
+
+:: 构建Linux arm64（aarch64）
+set GOOS=linux
+set GOARCH=arm64
+go build -o ofdgo_linux_arm64 -trimpath -ldflags "-s -w -buildid=" ./cmd/webview
+
+:: 构建Linux amd64（x64/x86_64）
+set GOOS=linux
+set GOARCH=amd64
+go build -o ofdgo_linux_amd64 -trimpath -ldflags "-s -w -buildid=" ./cmd/webview
+
+:: 构建Windows amd64（x64/x86_64）
+set GOOS=windows
+set GOARCH=amd64
+go build -o ofdgo_windows_amd64.exe -trimpath -ldflags "-H windowsgui -s -w -buildid=" ./cmd/webview
+```
+
 # 安装引擎
 ```shell
 go get -u github.com/xiaoqidun/ofdgo
@@ -67,6 +97,7 @@ go get -u github.com/xiaoqidun/ofdgo
 package main
 
 import (
+	"context"
 	"log"
 	"os"
 
@@ -95,12 +126,11 @@ func main() {
 		log.Fatal(err)
 	}
 	// 3. 保存文档
-	ofdFile, err := os.Create("test.ofd")
+	output, err := ofdgo.NewFileOutput("test.ofd")
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer ofdFile.Close()
+	if _, err := editor.SaveAs(context.Background(), output, ofdgo.WriteOptions{}); err != nil {
-	if _, err := editor.WriteTo(ofdFile); err != nil {
 		log.Fatal(err)
 	}
 }
@@ -111,15 +141,20 @@ func main() {
 package main
 
 import (
+	"context"
 	"log"
-	"os"
 
 	"github.com/xiaoqidun/ofdgo"
 )
 
 func main() {
 	// 1. 打开文档
-	reader, err := ofdgo.Open("test.ofd")
+	input, err := ofdgo.OpenFile(context.Background(), "test.ofd", ofdgo.InputOptions{})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer input.Close()
+	reader, err := ofdgo.NewReader(input)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -131,12 +166,11 @@ func main() {
 	}
 	editor.Info.Title = "编辑后的"
 	// 3. 另存文档
-	ofdFile, err := os.Create("edited.ofd")
+	output, err := ofdgo.NewFileOutput("edited.ofd")
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer ofdFile.Close()
+	if _, err := editor.SaveAs(context.Background(), output, ofdgo.WriteOptions{}); err != nil {
-	if _, err := editor.WriteTo(ofdFile); err != nil {
 		log.Fatal(err)
 	}
 }
@@ -156,15 +190,11 @@ import (
 
 func main() {
 	// 1. 打开文档
-	pdfFile, err := os.Open("test.pdf")
+	input, err := ofdgo.OpenFile(context.Background(), "test.pdf", ofdgo.InputOptions{})
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer pdfFile.Close()
-	info, err := pdfFile.Stat()
 	if err != nil {
 		log.Fatal(err)
 	}
+	defer input.Close()
 	// 2. 创建文件
 	ofdFile, err := os.Create("test.ofd")
 	if err != nil {
@@ -172,7 +202,7 @@ func main() {
 	}
 	defer ofdFile.Close()
 	// 3. 转换文档
-	report, err := ofdgo.ConvertPDF(context.Background(), pdfFile, info.Size(), ofdFile, ofdgo.PDFImportOptions{})
+	report, err := ofdgo.ConvertPDF(context.Background(), input, ofdFile, ofdgo.PDFImportOptions{})
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -188,6 +218,7 @@ func main() {
 package main
 
 import (
+	"context"
 	"log"
 	"os"
 
@@ -196,7 +227,12 @@ import (
 
 func main() {
 	// 1. 打开OFD文件
-	reader, err := ofdgo.Open("test.ofd")
+	input, err := ofdgo.OpenFile(context.Background(), "test.ofd", ofdgo.InputOptions{})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer input.Close()
+	reader, err := ofdgo.NewReader(input)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -220,6 +256,7 @@ func main() {
 package main
 
 import (
+	"context"
 	"log"
 	"os"
 
@@ -228,12 +265,13 @@ import (
 
 func main() {
 	// 1. 打开OFD文件
-	data, err := os.ReadFile("test.ofd")
+	input, err := ofdgo.OpenFile(context.Background(), "test.ofd", ofdgo.InputOptions{})
 	if err != nil {
 		log.Fatal(err)
 	}
+	defer input.Close()
 	// 2. 验证OFD签名
-	reports, err := ofdgo.VerifySignaturesBytes(data)
+	reports, err := ofdgo.VerifySignatures(input)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -261,5 +299,44 @@ func main() {
 }
 ```
 
+# 提取发票
+```go
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"log"
+	"os"
+
+	"github.com/xiaoqidun/ofdgo"
+)
+
+func main() {
+	// 1. 打开OFD文件
+	input, err := ofdgo.OpenFile(context.Background(), "invoice.ofd", ofdgo.InputOptions{})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer input.Close()
+	reader, err := ofdgo.NewReader(input)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer reader.Close()
+	// 2. 提取发票信息
+	report, err := reader.Invoices()
+	if err != nil {
+		log.Fatal(err)
+	}
+	// 3. 输出提取结果
+	encoder := json.NewEncoder(os.Stdout)
+	encoder.SetIndent("", "  ")
+	if err := encoder.Encode(report); err != nil {
+		log.Fatal(err)
+	}
+}
+```
+
 # 授权协议
 本项目使用 [Apache License 2.0](https://github.com/xiaoqidun/ofdgo/blob/main/LICENSE) 授权协议

assets/webui/assets.go

@@ -14,25 +14,14 @@
 
 package webuiassets
 
-import (
+import "embed"
-	"crypto/sha256"
-	"embed"
-	"encoding/hex"
-)
 
 // FS WebUI嵌入静态文件
 //
-//go:embed index.html ofdgo.css ofdgo.js ofdgo.json ofdgo.svg ofdgo.wasm ofdgo_edit.js ofdgo_font.js ofdgo_wasm.js ofdgo_work.js wasm_exec.js
+//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_theme.js ofdgo_util.js ofdgo_view.js ofdgo_wasm.js ofdgo_work.js wasm_exec.js
 var FS embed.FS
 
-// Checksum 计算WebUI嵌入资源校验值
+// NativeFS WebView嵌入静态文件
-// 返回: string SHA-256十六进制校验值
+//
-func Checksum() string {
+//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_theme.js ofdgo_util.js ofdgo_view.js
-	hash := sha256.New()
+var NativeFS embed.FS
-	entries, _ := FS.ReadDir(".")
-	for _, entry := range entries {
-		data, _ := FS.ReadFile(entry.Name())
-		hash.Write(data)
-	}
-	return hex.EncodeToString(hash.Sum(nil))
-}

assets/webui/ofdgo.json

@@ -22,6 +22,12 @@
 			"src": "./ofdgo.svg",
 			"sizes": "any",
 			"type": "image/svg+xml"
+		},
+		{
+			"src": "./ofdgo.png",
+			"sizes": "512x512",
+			"type": "image/png",
+			"purpose": "any"
 		}
 	]
 }

assets/webui/ofdgo_font.js

@@ -1,39 +1,59 @@
+import { bindDropdownPointer, positionDropdown } from "./ofdgo_util.js";
+
 const DATABASE = "ofdgo";
 
 export class FontPicker {
-	constructor(input, toggle, list, onChange, onOpen) {
+	constructor(input, toggle, list, onChange, onOpen, groupFonts) {
-		Object.assign(this, { input, toggle, list, onChange, onOpen, fonts: [], value: "", active: -1, open: false });
+		Object.assign(this, { input, toggle, list, onChange, onOpen, groupFonts, fonts: [], groups: [], value: "", active: -1, open: false });
 		input.addEventListener("input", () => this.show(input.value));
 		input.addEventListener("focus", () => input.select());
-		input.addEventListener("click", () => { if (!this.open) this.show(); });
+		input.addEventListener("pointerdown", event => { if (event.button === 0 && !this.open) event.preventDefault(); });
+		input.addEventListener("click", () => { if (!this.open) { input.focus(); input.select(); this.show(); } });
 		input.addEventListener("keydown", event => this.keyDown(event));
 		input.addEventListener("blur", () => { this.commitExact(); this.close(); });
 		toggle.addEventListener("pointerdown", event => event.preventDefault());
 		toggle.addEventListener("click", () => {
 			if (this.open) this.close();
-			else { input.focus(); this.show(); }
+			else { input.focus(); input.select(); this.show(); }
-		});
-		list.addEventListener("pointerdown", event => {
-			if (event.target.closest("[role=option]")) event.preventDefault();
-		});
-		list.addEventListener("click", event => {
-			const option = event.target.closest("[role=option]");
-			if (option) this.choose(Number(option.dataset.index));
 		});
+		bindDropdownPointer(list, index => this.choose(index));
 		window.addEventListener("resize", () => this.close());
 	}
 
-	setFonts(fonts, selected) {
+	setFonts(fonts, selected, preserve = false) {
-		this.close();
+		const open = preserve && this.open;
+		if (!open) this.close();
 		this.fonts = fonts;
+		this.groups = fonts.map((_, index) => [index]);
 		this.names = new Map();
 		for (const font of fonts) {
-			const name = (font.fullName || font.name).normalize("NFKC").toLocaleLowerCase();
+			const name = (font.menuFamily || font.fullName || font.name).normalize("NFKC").toLocaleLowerCase();
 			this.names.set(name, (this.names.get(name) || 0) + 1);
 		}
-		const key = font => font?.id || font?.postscriptName;
+		const key = font => font?.richKey || font?.id || font?.postscriptName;
 		this.value = !fonts.length ? "" : selected === null ? "-1" : String(Math.max(0, fonts.findIndex(font => key(font) === key(selected))));
-		this.restore();
+		if (open) {
+			const active = this.matches[this.active]?.font;
+			this.show(this.query, false);
+			const index = active ? this.matches.findIndex(({ font }) => !font.disabled && key(font) === key(active)) : -1;
+			if (index >= 0) this.activate(index);
+		} else this.restore();
+		if (this.groupFonts) this.grouping = this.groupFonts(fonts).then(groups => {
+			if (this.fonts !== fonts) return;
+			this.groups = groups;
+			this.names.clear();
+			for (const group of groups) {
+				const font = fonts[group[0]], name = (font.menuFamily || font.fullName || font.name).normalize("NFKC").toLocaleLowerCase();
+				this.names.set(name, (this.names.get(name) || 0) + 1);
+			}
+			if (this.open) {
+				const active = this.matches[this.active]?.index;
+				this.show(this.query, false);
+				const index = this.matches.findIndex(({ group, font }) => group.includes(active) && !font.disabled);
+				if (index >= 0) this.activate(index);
+			}
+			else this.restore();
+		}).catch(() => {});
 	}
 
 	setDisabled(disabled) {
@@ -43,36 +63,45 @@ export class FontPicker {
 
 	restore() {
 		const font = this.fonts[Number(this.value)];
-		this.input.value = font?.fullName || font?.name || "";
+		const value = font?.menuFamily || font?.fullName || font?.name || "";
+		if (this.input.value !== value) {
+			this.input.value = value;
+			if (document.activeElement === this.input) this.input.select();
+		}
 		this.input.scrollLeft = 0;
 		this.input.title = font ? [this.input.value, this.sourceLabel(font)].filter(Boolean).join(" · ") : "";
-		this.input.setAttribute("aria-expanded", String(this.open));
-		this.input.removeAttribute("aria-activedescendant");
 	}
 
 	sourceLabel(font) {
-		const name = (font.fullName || font.name).normalize("NFKC").toLocaleLowerCase();
+		const name = (font.menuFamily || font.fullName || font.name).normalize("NFKC").toLocaleLowerCase();
 		if (this.names.get(name) < 2) return "";
 		return font.embedded ? "内嵌" : font.file || ["stored", "upload"].includes(font.source) ? "上传" : "系统";
 	}
 
 	show(query = "", load = true) {
 		if (this.input.disabled) return;
+		this.query = query;
 		const normalize = value => value.normalize("NFKC").toLocaleLowerCase().replace(/\s+/g, " ").trim();
 		const terms = normalize(query).split(" ").filter(Boolean);
-		this.matches = this.fonts.map((font, index) => ({ font, index })).filter(({ font }) => {
+		this.matches = this.groups.map(group => {
-			const name = normalize([font.fullName, font.name, font.family, font.style, font.postscriptName, ...(font.names || [])].filter(Boolean).join(" "));
+			const index = group.find(index => !this.fonts[index].bold && !this.fonts[index].italic && !this.fonts[index].disabled) ?? group[0];
+			return { font: this.fonts[index], index, group };
+		}).filter(({ group }) => {
+			const name = normalize(group.flatMap(index => {
+				const font = this.fonts[index];
+				return [font.menuFamily, font.menuStyle, font.fullName, font.name, font.family, font.style, font.postscriptName, ...(font.names || [])];
+			}).filter(Boolean).join(" "));
 			return terms.every(term => name.includes(term));
 		});
 		this.list.replaceChildren();
 		for (const { font, index } of this.matches) {
 			const option = document.createElement("div");
+			option.className = "font-option";
 			option.id = `${this.list.id}-${index}`;
 			option.dataset.index = String(index);
-			option.setAttribute("role", "option");
+			option.setAttribute("data-disabled", String(Boolean(font.disabled)));
-			option.setAttribute("aria-disabled", String(Boolean(font.disabled)));
 			const name = document.createElement("span");
-			name.textContent = font.fullName || font.name;
+			name.textContent = font.menuFamily || font.fullName || font.name;
 			option.append(name);
 			const source = this.sourceLabel(font);
 			if (source) {
@@ -92,30 +121,24 @@ export class FontPicker {
 		}
 		if (!this.open) this.list.showPopover();
 		this.open = true;
-		this.input.setAttribute("aria-expanded", "true");
 		this.position();
-		const selected = this.matches.findIndex(({ font, index }) => !font.disabled && String(index) === this.value);
+		const selected = this.matches.findIndex(({ font, group }) => !font.disabled && group.includes(Number(this.value)));
 		this.activate(selected < 0 ? this.matches.findIndex(({ font }) => !font.disabled) : selected);
 		if (load) this.onOpen?.();
 	}
 
 	position() {
 		if (!this.open) return;
-		const rect = this.input.parentElement.getBoundingClientRect();
+		if (!positionDropdown(this.list, this.input.parentElement)) this.close();
-		if (rect.right <= 0 || rect.left >= window.innerWidth) { this.close(); return; }
-		const width = Math.min(rect.width, window.innerWidth - 16);
-		Object.assign(this.list.style, { left: `${Math.max(8, Math.min(rect.left, window.innerWidth - width - 8))}px`,
-			top: `${rect.bottom + 4}px`, width: `${width}px`, maxHeight: `${Math.max(40, Math.min(280, window.innerHeight - rect.bottom - 12))}px` });
 	}
 
 	activate(index) {
 		this.active = index;
-		[...this.list.children].forEach((option, i) => option.setAttribute("aria-selected", String(i === index)));
+		[...this.list.children].forEach((option, i) => option.setAttribute("data-selected", String(i === index)));
 		const option = this.list.children[index];
 		if (option) {
-			this.input.setAttribute("aria-activedescendant", option.id);
 			option.scrollIntoView({ block: "nearest" });
-		} else this.input.removeAttribute("aria-activedescendant");
+		}
 	}
 
 	choose(index) {
@@ -123,16 +146,27 @@ export class FontPicker {
 		const changed = this.value !== String(index);
 		this.value = String(index);
 		this.close();
-		if (changed) return this.onChange();
+		if (changed) {
+			const task = this.changing = Promise.resolve(this.onChange());
+			return task.finally(() => { if (this.changing === task) this.changing = null; });
+		}
 	}
 
 	commitExact() {
 		const value = this.input.value.trim().toLocaleLowerCase();
 		const matches = font => font && !font.disabled
-			&& [font.fullName, font.name, font.postscriptName, ...(font.names || [])].some(name => name?.toLocaleLowerCase() === value);
+			&& [font.menuFamily, font.fullName, font.name, font.postscriptName, ...(font.names || [])].some(name => name?.toLocaleLowerCase() === value);
 		const selected = Number(this.value);
 		const index = matches(this.fonts[selected]) ? selected : this.fonts.findIndex(matches);
-		if (index >= 0) this.choose(index);
+		if (index >= 0) return this.choose(index);
+	}
+
+	prepareCommit(event) {
+		if (this.open && (!event || ![this.input, this.toggle, this.list].some(node => node.contains(event.target)))) {
+			this.commitExact();
+			this.close();
+		}
+		return this.changing;
 	}
 
 	close() {
@@ -141,7 +175,7 @@ export class FontPicker {
 	}
 
 	keyDown(event) {
-		if (event.isComposing) return;
+		if (event.isComposing || event.key === "Tab" && (event.ctrlKey || event.metaKey || event.altKey)) return;
 		if (!["Escape", "Enter", "ArrowDown", "ArrowUp", "Tab"].includes(event.key)) return;
 		event.stopPropagation();
 		if (event.key === "Escape") {
@@ -163,7 +197,8 @@ export class FontPicker {
 }
 
 export class FontManager {
-	constructor({ onChange, onPermissionChange }) {
+	constructor({ onChange, onPermissionChange, host = null }) {
+		this.host = host;
 		this.userFonts = [];
 		this.localFonts = [];
 		this.catalog = [];
@@ -271,7 +306,7 @@ export class FontManager {
 
 	async queryLocal() {
 		try {
-			const available = await window.queryLocalFonts();
+			const available = this.host ? await this.host.fonts() : await window.queryLocalFonts();
 			this.catalog = available;
 			this.catalogLoaded = true;
 			this.permission = "granted";
@@ -298,6 +333,7 @@ export class FontManager {
 	}
 
 	async read(font) {
+		if (font.nativeFile) return font.nativeFile;
 		if (font.blob) {
 			const blob = await font.blob();
 			return new Uint8Array(await blob.arrayBuffer());
@@ -316,13 +352,44 @@ export class FontManager {
 		}), ...this.catalog];
 	}
 
-	async loadFaces(inspect) {
+	async loadFaces(inspect, current = () => true) {
-		while (true) {
+		while (current()) {
 			const file = this.userFonts.find(font => font.enabled && !font.faces);
-			if (!file) return;
+			if (!file) break;
 			try { file.faces = await inspect(await this.read(file)); }
-			catch { file.faces = []; }
+			catch { if (!current()) return; file.faces = []; }
 		}
+		const pending = this.catalog.filter(font => font.blob && !font.menuFamily && !font.metadataFailed);
+		await Promise.all(Array.from({ length: Math.min(4, pending.length) }, async () => {
+			while (current() && pending.length) {
+				const font = pending.shift();
+				try {
+					const faces = await inspect(await this.read(font));
+					const face = faces.find(face => face.postscriptName === font.postscriptName);
+					if (face) Object.assign(font, { index: face.index, menuFamily: face.menuFamily, menuStyle: face.menuStyle, familyKey: face.familyKey, bold: face.bold, italic: face.italic, names: face.names });
+					else font.metadataFailed = true;
+				} catch { if (current()) font.metadataFailed = true; }
+			}
+		}));
+	}
+
+	async defaultFont(order, inspect, current = () => true) {
+		const fonts = this.editorFonts().filter(font => !font.disabled);
+		if (!fonts.length) return;
+		const families = [["DengXian", "等线"], ["Microsoft YaHei", "微软雅黑"], ["PingFang SC", "苹方-简", "苹方 简体"],
+			["Noto Sans SC", "Noto Sans CJK SC"], ["Source Han Sans SC", "Source Han Sans CN", "思源黑体", "思源黑体 CN"]];
+		const indices = await order(fonts, families);
+		let fallback = fonts.length;
+		for (const index of indices) {
+			if (!current()) return;
+			try {
+				await inspect(fonts[index], "中文汉字编辑水印，。！？");
+				if (current()) return fonts[index];
+			} catch (error) {
+				if (error.missingGlyphs) fallback = Math.min(fallback, index);
+			}
+		}
+		if (current()) return fonts[fallback];
 	}
 
 	async add(fonts) {
@@ -402,7 +469,7 @@ export class FontManager {
 		for (const font of fonts) {
 			if (disabled.has(this.localName(font))) continue;
 			const names = [this.localName(font), font.postscriptName && `${font.postscriptName}.ttf`,
-				font.family && `${[font.family, font.style].filter(Boolean).join(" ")}.ttf`];
+				font.family && `${[font.family, font.style].filter(Boolean).join(" ")}.ttf`, ...(font.names || []).map(name => `${name}.ttf`)];
 			for (const name of names) {
 				if (name && !entries.has(name)) entries.set(name, font);
 			}
@@ -411,10 +478,15 @@ export class FontManager {
 	}
 
 	canReadLocal() {
-		return typeof window.queryLocalFonts === "function";
+		return !!this.host || typeof window.queryLocalFonts === "function";
 	}
 
 	async refreshPermission() {
+		if (this.host) {
+			this.permission = "granted";
+			this.onPermissionChange();
+			return;
+		}
 		if (!this.canReadLocal() || !navigator.permissions?.query) {
 			this.onPermissionChange();
 			return;

assets/webui/ofdgo_host.js

@@ -0,0 +1,845 @@
+let engineModule = null;
+let engineScheduler = null;
+let engineSequence = 0;
+const engineRuntimes = new Map();
+
+function requestKey(worker, data) {
+	return worker.shared ? JSON.stringify([data.engineID, data.id]) : data.id;
+}
+
+export function engineLimits() {
+	engineScheduler ||= new BrowserScheduler();
+	return {parallelism: engineScheduler.capacity, memoryBytes: engineScheduler.budget};
+}
+
+class BrowserScheduler {
+	constructor() {
+		this.budget = Math.max(256, Math.min(2048, (navigator.deviceMemory || 2) * 256)) * 1024 * 1024;
+		this.capacity = Math.max(1, Math.min((navigator.hardwareConcurrency || 2) - 1, Math.floor(this.budget / (128 << 20))));
+		this.limit = Math.min(this.capacity, Math.max(1, Math.floor(this.budget / (512 << 20))));
+		this.workers = new Set();
+		this.queue = [];
+		this.sequence = 0;
+	}
+
+	get memory() {
+		return [...this.workers].reduce((total, worker) => total + Math.max(worker.memory, worker.reservation), 0);
+	}
+
+	active() {
+		return [...this.workers].reduce((total, worker) => total + new Set([...worker.operations.values()].map(data => data.engineID)).size, 0);
+	}
+
+	owner(worker, data) {
+		return worker.shared ? worker.sessions.get(data.engineID) : worker;
+	}
+
+	priority(task) {
+		return Number(task.worker.batch || this.owner(task.worker, task.data)?.foreground === false) + Number(!!task.data.preload || !!task.data.background);
+	}
+
+	submit(worker, data, transfer) {
+		if (data.preload && this.owner(worker, data)?.pagesPaused) {
+			worker.receive({data:{engineID:data.engineID, id:data.id, ok:false, canceled:true, error:"预加载已暂停"}});
+			return;
+		}
+		this.queue.push({worker, data, transfer, queued:performance.now(), order:++this.sequence});
+		this.drain();
+	}
+
+	send(task) {
+		const {worker, data, transfer} = task;
+		worker.requests.set(requestKey(worker, data), performance.now());
+		worker.operations.set(requestKey(worker, data), data);
+		try { worker.worker.postMessage(data, transfer); }
+		catch (error) {
+			worker.requests.delete(requestKey(worker, data));
+			worker.operations.delete(requestKey(worker, data));
+			worker.receive({data:{engineID:data.engineID, id:data.id, ok:false, error:error.message}});
+		}
+	}
+
+	complete(worker, data) {
+		if (data.memory) worker.memory = data.memory;
+		if (data.id == null || data.type) return;
+		const key = requestKey(worker, data);
+		const started = worker.requests.get(key);
+		const elapsed = data.elapsed ?? (started === undefined ? 0 : performance.now() - started);
+		const operation = worker.operations.get(key), owner = this.owner(worker, data);
+		if (worker.primary && started !== undefined && data.ok && owner) {
+			if (operation?.name === "ofdgoOpen") owner.openTime = elapsed;
+			if (operation?.name === "ofdgoRenderPage") owner.pageTime = owner.pageTime ? owner.pageTime * 0.75 + elapsed * 0.25 : elapsed;
+		}
+		worker.requests.delete(key);
+		worker.operations.delete(key);
+		if (this.memory > this.budget) this.limit = Math.max(1, this.limit - 1);
+		else if (started !== undefined && data.ok && elapsed > 100 && this.memory + Math.max(128 << 20, worker.memory) < this.budget) this.limit = Math.min(this.capacity, this.limit + 1);
+	}
+
+	drain() {
+		if (this.draining) return;
+		this.draining = true;
+		try {
+			if (this.queue.length) for (const worker of [...this.workers].sort((a,b) => b.memory-a.memory)) {
+				if (this.memory + (64 << 20) <= this.budget) break;
+				if (!worker.requests.size) worker.reclaim?.();
+			}
+			this.queue.sort((a, b) => this.priority(a) - this.priority(b) + (a.queued - b.queued) / 2000);
+			for (let i = 0; i < this.queue.length;) {
+				const task = this.queue[i];
+				if (task.worker.closed) { this.queue.splice(i, 1); continue; }
+				if (this.queue.some(previous => previous.worker === task.worker && previous.data.engineID === task.data.engineID && previous.order < task.order)) { i++; continue; }
+				const busy = [...task.worker.operations.values()].some(data => data.engineID === task.data.engineID && data.name !== "ofdgoSaveSnapshot");
+				const snapshot = task.data.name === "ofdgoSaveSnapshot" && [...task.worker.operations.values()].some(data => data.engineID === task.data.engineID && data.name === "ofdgoSaveSnapshot");
+				const active = this.active();
+				const interactive = task.worker.primary && this.owner(task.worker, task.data)?.foreground === true && !task.data.preload && !task.data.background;
+				const foregroundActive = [...this.workers].some(worker => [...worker.operations.values()].some(data => data.name !== "ofdgoSaveSnapshot" && worker.primary && this.owner(worker, data)?.foreground === true && !data.preload && !data.background));
+				const continuing = task.worker.primary && [...task.worker.operations.values()].some(data => data.engineID === task.data.engineID);
+				const available = continuing || active < this.limit || interactive && !foregroundActive && active < this.limit + 1;
+				if (busy || snapshot || !available || !task.worker.primary && active && this.memory + (64 << 20) > this.budget) { i++; continue; }
+				this.queue.splice(i, 1);
+				this.send(task);
+			}
+		} finally { this.draining = false; }
+	}
+
+	cancel(worker, data) {
+		const index = this.queue.findIndex(task => task.worker === worker && requestKey(worker, task.data) === requestKey(worker, data));
+		if (index < 0) return false;
+		const task = this.queue.splice(index, 1)[0];
+		worker.receive({data:{engineID:task.data.engineID, id:data.id, ok:false, canceled:true, error:"操作已取消"}});
+		this.drain();
+		return true;
+	}
+
+	pause(worker, engineID) {
+		const paused = this.queue.filter(task => task.worker === worker && task.data.engineID === engineID && task.data.preload);
+		this.queue = this.queue.filter(task => !paused.includes(task));
+		for (const task of paused) worker.receive({data:{engineID, id:task.data.id, ok:false, canceled:true, error:"预加载已暂停"}});
+	}
+
+	remove(worker) {
+		this.workers.delete(worker);
+		this.queue = this.queue.filter(task => task.worker !== worker);
+		worker.requests.clear();
+		worker.operations.clear();
+		this.drain();
+	}
+}
+
+class BrowserWorker {
+	constructor(options) {
+		engineScheduler ||= new BrowserScheduler();
+		this.primary = !!options.primary;
+		this.shared = !!options.shared;
+		this.engineID = this.shared ? null : `engine-${++engineSequence}`;
+		this.sessions = new Map();
+		this.closingSessions = new Set();
+		this.batch = !options.primary && !options.page;
+		this.requests = new Map();
+		this.operations = new Map();
+		this.foreground = !this.batch;
+		this.pagesPaused = false;
+		this.memory = 64 << 20;
+		this.reservation = 0;
+		this.closed = false;
+		this.url = String(options.url || "./ofdgo_wasm.js");
+		this.worker = new Worker(this.url);
+		engineScheduler.workers.add(this);
+		this.worker.onmessage = event => {
+			if (this.closed || event.data.type === "module") return;
+			engineScheduler.complete(this, event.data);
+			if (event.data.type === "exit" && (!this.shared || !event.data.engineID)) this.terminate();
+			try { this.receive(event); }
+			finally { engineScheduler.drain(); }
+		};
+		this.worker.onerror = event => { this.terminate(); this.fail("onerror", event); };
+		this.worker.onmessageerror = event => { this.terminate(); this.fail("onmessageerror", event); };
+		this.worker.addEventListener("message", event => {
+			if (event.data.type !== "module") return;
+			event.stopImmediatePropagation();
+			engineModule ||= WebAssembly.compileStreaming(fetch("./ofdgo.wasm")).catch(error => { engineModule = null; throw error; });
+			engineModule.then(module => { if (!this.closed) this.worker.postMessage({ type:"module", module }); }, error => { if (!this.closed) this.worker.postMessage({ type:"module", error:error.message }); });
+		});
+		if (!this.shared) this.worker.postMessage({type:"open", engineID:this.engineID});
+	}
+
+	receive(event) {
+		if (!event.data.engineID && !["progress", "exit"].includes(event.data.type)) return;
+		if (!this.shared) {
+			if (event.data.engineID && event.data.engineID !== this.engineID) return;
+			this.onmessage?.(event);
+			return;
+		}
+		if (event.data.type === "closed") {
+			if (!this.closingSessions.delete(event.data.engineID)) return;
+			for (const [key, data] of this.operations) if (data.engineID === event.data.engineID) {
+				this.requests.delete(key);
+				this.operations.delete(key);
+			}
+			if (!this.sessions.size && !this.closingSessions.size) this.terminate();
+			return;
+		}
+		const targets = event.data.engineID ? [this.sessions.get(event.data.engineID)] : [...this.sessions.values()];
+		for (const session of targets) session?.receive(event);
+	}
+
+	fail(name, event) {
+		if (!this.shared) { this[name]?.(event); return; }
+		for (const session of [...this.sessions.values()]) {
+			session.terminate();
+			session[name]?.(event);
+		}
+	}
+
+	postMessage(data, transfer) {
+		if (this.closed) throw new DOMException("引擎已关闭", "AbortError");
+		if (!this.shared) data = {...data, engineID:this.engineID};
+		if (data.type) {
+			if (data.type === "cancel" && engineScheduler.cancel(this, data)) return;
+			this.worker.postMessage(data, transfer);
+		} else engineScheduler.submit(this, data, transfer);
+	}
+
+	setForeground(foreground) {
+		this.foreground = !!foreground;
+		this.pausePages(!this.foreground);
+	}
+
+	pausePages(paused = true) {
+		this.pagesPaused = !!paused;
+		if (this.pagesPaused) engineScheduler.pause(this, this.engineID);
+		engineScheduler.drain();
+	}
+
+	terminate() {
+		if (this.closed) return;
+		this.closed = true;
+		if (engineRuntimes.get(this.url) === this) engineRuntimes.delete(this.url);
+		this.closingSessions.clear();
+		this.worker.terminate();
+		engineScheduler.remove(this);
+	}
+}
+
+class BrowserSession {
+	constructor(options) {
+		const url = String(options.url || "./ofdgo_wasm.js");
+		let runtime = engineRuntimes.get(url);
+		if (!runtime || runtime.closed) {
+			runtime = new BrowserWorker({primary:true, shared:true, url});
+			engineRuntimes.set(url, runtime);
+		}
+		this.runtime = runtime;
+		this.engineID = `engine-${++engineSequence}`;
+		this.requests = new Set();
+		this.foreground = true;
+		this.pagesPaused = false;
+		this.closed = false;
+		runtime.sessions.set(this.engineID, this);
+		runtime.postMessage({type:"open", engineID:this.engineID});
+	}
+
+	receive(event) {
+		if (this.closed) return;
+		if (event.data.id != null && !event.data.type) this.requests.delete(event.data.id);
+		if (event.data.type === "exit") this.terminate();
+		this.onmessage?.(event);
+	}
+
+	postMessage(data, transfer) {
+		if (this.closed) throw new DOMException("引擎已关闭", "AbortError");
+		if (!data.type) this.requests.add(data.id);
+		this.runtime.postMessage({...data, engineID:this.engineID}, transfer);
+	}
+
+	setForeground(foreground) {
+		this.foreground = !!foreground;
+		this.pausePages(!this.foreground);
+	}
+
+	pausePages(paused = true) {
+		this.pagesPaused = !!paused;
+		if (this.pagesPaused) engineScheduler.pause(this.runtime, this.engineID);
+		engineScheduler.drain();
+	}
+
+	terminate() {
+		if (this.closed) return;
+		this.closed = true;
+		this.runtime.sessions.delete(this.engineID);
+		engineScheduler.queue = engineScheduler.queue.filter(task => task.worker !== this.runtime || task.data.engineID !== this.engineID);
+		this.requests.clear();
+		if (!this.runtime.closed) {
+			this.runtime.closingSessions.add(this.engineID);
+			this.runtime.postMessage({type:"close", engineID:this.engineID});
+		}
+		engineScheduler.drain();
+	}
+}
+
+export function createEngineWorker(options = {}) {
+	if (nativeHost) return nativeHost.worker();
+	if (options.page || options.batch) return new BrowserWorker(options);
+	if (options.primary) return new BrowserSession(options);
+	return new BrowserEngine(options);
+}
+
+export async function documentBytes(file) {
+	if (file?.nativeFile) return file;
+	if (file instanceof Blob) return new Response(file.stream()).blob();
+	return new Uint8Array(await file.arrayBuffer());
+}
+
+class BrowserEngine {
+	constructor(options) {
+		this.primary = createEngineWorker({primary:true, url:options.url});
+		this.engineID = this.primary.engineID;
+		this.workerURL = options.url;
+		this.primary.onmessage = event => {
+			const data = event.data;
+			if (data.memory) this.memory = data.memory;
+			if (this.source) this.parallelism = engineScheduler.limit;
+			const rendered = data.id != null && !data.type && this.requests.delete(data.id);
+			this.onmessage?.(event);
+			if (rendered && data.ok) this.dispatchPages();
+		};
+		this.primary.onerror = event => this.onerror?.(event);
+		this.primary.onmessageerror = event => this.onmessageerror?.(event);
+		this.requests = new Map();
+		this.fontRequests = new Map();
+		this.primaryPages = new Set();
+		this.slots = new Set();
+		this.sequence = 0;
+		this.revision = 0;
+		this.memory = 0;
+		this.parallelism = 1;
+		this.budget = engineScheduler.budget;
+		this.closed = false;
+		this.source = null;
+		this.pageSource = null;
+		this.foreground = true;
+		this.pagesPaused = false;
+	}
+
+	configurePages(source) {
+		const current = this.pageSource;
+		const fonts = (source?.fonts || []).map(font => font?.data !== undefined ? {name:font.name, data:font.data} : font);
+		const sameNames = JSON.stringify(source?.fontNames || []) === JSON.stringify(current?.fontNames || []);
+		const sameFonts = current && fonts.length === current.fonts.length && fonts.every((font, index) => font === current.fonts[index] || font?.data !== undefined && font.name === current.fonts[index]?.name && font.data === current.fonts[index]?.data);
+		if (source && current && source.file === current.file && !!source.pdf === !!current.pdf && (source.document || 0) === current.document && (source.version || "") === current.version && source.annotations === current.annotations && source.revision === current.revision && sameFonts && sameNames) return;
+		this.invalidatePages();
+		if (!source || this.closed) return;
+		this.pageSource = {...source, fonts, document:source.document || 0, version:source.version || ""};
+		this.source = {...source, file: source.file instanceof Blob ? source.file : new Blob([source.file])};
+		this.parallelism = engineScheduler.limit;
+	}
+
+	setForeground(foreground) {
+		this.foreground = !!foreground;
+		this.primary.setForeground(this.foreground);
+		for (const slot of this.slots) slot.worker.setForeground(this.foreground);
+		this.pausePages(!this.foreground);
+	}
+
+	pausePages(paused = true) {
+		this.pagesPaused = !!paused;
+		this.primary.pausePages(this.pagesPaused);
+		for (const slot of this.slots) slot.worker.pausePages(this.pagesPaused);
+	}
+
+	invalidatePages() {
+		this.revision++;
+		this.primaryPages.clear();
+		this.source = null;
+		this.pageSource = null;
+		this.parallelism = 1;
+		this.startupTime = 0;
+		this.primary.pageTime = 0;
+		for (const slot of this.slots) this.closeSlot(slot);
+	}
+
+	closeSlot(slot, error = new DOMException("页面加载已取消", "AbortError")) {
+		if (!this.slots.delete(slot)) return;
+		slot.worker.terminate();
+		for (const [id, request] of this.fontRequests) if (request.worker === slot.worker) this.fontRequests.delete(id);
+		slot.rejectReady(error);
+		for (const pending of slot.pending.values()) pending.reject(error);
+		slot.pending.clear();
+	}
+
+	createSlot(source) {
+		const started = performance.now();
+		const worker = createEngineWorker({page:true, url:this.workerURL});
+		worker.setForeground(this.foreground);
+		worker.pausePages(this.pagesPaused);
+		const slot = {worker, pending: new Map(), busy: false, memory: Math.max(128 << 20, this.memory), pages:new Set(), lastPage:0};
+		worker.reservation = slot.memory;
+		worker.reclaim = () => { if (!slot.busy) this.closeSlot(slot); };
+		const ready = new Promise((resolve, reject) => {
+			slot.rejectReady = reject;
+			worker.onmessage = ({data}) => {
+				if (data.memory) slot.memory = data.memory;
+				if (this.source) this.parallelism = engineScheduler.limit;
+				if (data.type === "ready") { resolve(); return; }
+				if (data.type === "exit") { this.closeSlot(slot, new Error("页面加载失败")); return; }
+				if (data.type === "font") {
+					const request = `${slot.worker.engineID}:${data.request}`;
+					this.fontRequests.set(request, {worker:slot.worker, request:data.request});
+					this.onmessage?.({data:{...data, id:slot.requestID, request}});
+					return;
+				}
+				if (data.type) return;
+				const request = slot.pending.get(data.id);
+				if (!request) return;
+				slot.pending.delete(data.id);
+				if (data.ok) request.resolve(data);
+				else request.reject(Object.assign(new Error(data.error), {code:data.code, name:data.canceled ? "AbortError" : "Error"}));
+			};
+			worker.onerror = worker.onmessageerror = () => this.closeSlot(slot, new Error("页面加载失败"));
+		});
+		this.slots.add(slot);
+		slot.ready = ready.then(async () => {
+			let opened = source.pdf
+				? await this.callSlot(slot, "ofdgoOpenPDF", [source.file, source.fonts, null, source.annotations, source.fontNames])
+				: await this.callSlot(slot, "ofdgoOpen", [source.file, source.fonts, source.annotations]);
+			if ((source.document || 0) !== (opened.data.documentIndex || 0)) opened = await this.callSlot(slot, "ofdgoSelectDocument", [source.document]);
+			if ((source.version || "") !== (opened.data.documentVersion || "")) await this.callSlot(slot, "ofdgoSelectVersion", [source.version || ""]);
+			if (this.slots.has(slot)) this.startupTime = performance.now() - started;
+		});
+		slot.ready.catch(() => {});
+		return slot;
+	}
+
+	callSlot(slot, name, args, preload = false) {
+		return new Promise((resolve, reject) => {
+			if (!this.slots.has(slot)) { reject(new DOMException("页面加载已取消", "AbortError")); return; }
+			const id = --this.sequence;
+			slot.pending.set(id, {resolve, reject});
+			try { slot.worker.postMessage({id, name, args, preload}); }
+			catch (error) { slot.pending.delete(id); reject(error); }
+		});
+	}
+
+	pageSlot(data) {
+		if (this.primaryPages.has(data.args[0])) return null;
+		const preferred = [...this.slots].find(slot => !slot.busy && slot.pages.has(data.args[0]));
+		const pending = [...this.requests.values()].filter(slot => slot === null).length - Number(this.requests.has(data.id));
+		if (!preferred && pending <= 0) return null;
+		let slot = preferred || [...this.slots].filter(slot => !slot.busy).sort((a,b) => Math.abs(a.lastPage-data.args[0])-Math.abs(b.lastPage-data.args[0]))[0];
+		const worthwhile = (this.primary.pageTime || 0) * pending >= Math.max(50, this.startupTime || this.primary.openTime || 0);
+		if (!slot && worthwhile && this.foreground && !this.pagesPaused && this.slots.size < this.parallelism - 1
+			&& engineScheduler.memory + Math.max(128 << 20, this.memory) <= this.budget) slot = this.createSlot(this.source);
+		return slot;
+	}
+
+	dispatchPages() {
+		if (this.closed || !this.source || !this.foreground || this.pagesPaused) return;
+		const draining = engineScheduler.draining;
+		engineScheduler.draining = true;
+		try {
+			const queued = engineScheduler.queue.filter(task => task.worker === this.primary.runtime && task.data.engineID === this.engineID).sort((a,b) => a.order-b.order);
+			for (const task of queued) {
+				if (task.data.name !== "ofdgoRenderPage") break;
+				if (this.requests.get(task.data.id) !== null) continue;
+				let slot;
+				try { slot = this.pageSlot(task.data); } catch { break; }
+				if (!slot) break;
+				engineScheduler.queue.splice(engineScheduler.queue.indexOf(task), 1);
+				this.primary.requests.delete(task.data.id);
+				this.renderSlot(slot, task.data, task.transfer);
+			}
+		} finally { engineScheduler.draining = draining; }
+	}
+
+	postMessage(data, transfer) {
+		if (this.closed) return;
+		if (data.type === "font" && typeof data.request === "string") {
+			const request = this.fontRequests.get(data.request);
+			if (request) {
+				this.fontRequests.delete(data.request);
+				request.worker.postMessage({...data, request:request.request}, transfer);
+			}
+			return;
+		}
+		if (!data.type && data.preload && this.pagesPaused) {
+			this.onmessage?.({data:{engineID:this.engineID, id:data.id, ok:false, canceled:true, error:"预加载已暂停"}});
+			return;
+		}
+		if (data.type === "cancel") {
+			const slot = this.requests.get(data.id);
+			if (slot && slot !== this.primary) this.closeSlot(slot);
+			else this.primary.postMessage(data);
+			return;
+		}
+		if (!data.type && data.name !== "ofdgoRenderPage" && ![
+			"ofdgoLoadPDF", "ofdgoDocumentInfo", "ofdgoDocumentVersions", "ofdgoDocumentNavigation", "ofdgoOpenLinks", "ofdgoOutlineLinks", "ofdgoRenderBackends", "ofdgoSVGFontData",
+			"ofdgoSearchPage", "ofdgoPageTextString", "ofdgoResources", "ofdgoResourceReferences", "ofdgoResourceTargets",
+			"ofdgoResourceLocations", "ofdgoFontPreview", "ofdgoFontFaces", "ofdgoFontFace", "ofdgoMatchFontFiles",
+			"ofdgoImages", "ofdgoStructureTargets", "ofdgoStructureObjects", "ofdgoPackageDocuments", "ofdgoVerifySignatures",
+			"ofdgoAnnotationInfos", "ofdgoInvoices", "ofdgoInvoice", "ofdgoExportInvoice", "ofdgoValidateInvoice",
+			"ofdgoActionList", "ofdgoPageSettings", "ofdgoReadAnnotation", "ofdgoPreviewSignatureSeal",
+			"ofdgoExportFormats", "ofdgoOutputFormats", "ofdgoParsePageRange", "ofdgoExportPage", "ofdgoExportDocument",
+			"ofdgoPreparePrint", "ofdgoLayoutPrint", "ofdgoPrintSide", "ofdgoPrintPDF", "ofdgoDiscardPrint",
+			"ofdgoExportAttachment", "ofdgoExportResource", "ofdgoExportMedia", "ofdgoExportVersion"
+		].includes(data.name)) this.invalidatePages();
+		const slot = data.name === "ofdgoRenderPage" && this.source ? this.pageSlot(data) : null;
+		if (!slot) {
+			if (data.name === "ofdgoRenderPage") this.requests.set(data.id, null);
+			this.primary.postMessage(data, transfer);
+			return;
+		}
+		this.renderSlot(slot, data, transfer);
+	}
+
+	renderSlot(slot, data, transfer) {
+		slot.busy = true;
+		slot.requestID = data.id;
+		this.requests.set(data.id, slot);
+		const revision = this.revision;
+		let fallback = false;
+		slot.ready.then(() => this.callSlot(slot, data.name, data.args, !!data.preload)).then(result => {
+			if (revision !== this.revision) throw new DOMException("页面加载已取消", "AbortError");
+			if (this.source.pdf && ((JSON.parse(result.data.annotations || "null") || []).length || result.data.links?.length)) {
+				this.primaryPages.add(data.args[0]);
+				this.requests.set(data.id, this.primary);
+				fallback = true;
+				this.primary.postMessage(data, transfer);
+				return;
+			}
+			slot.lastPage = data.args[0];
+			slot.pages.delete(slot.lastPage);
+			slot.pages.add(slot.lastPage);
+			if (slot.pages.size > 16) slot.pages.delete(slot.pages.values().next().value);
+			if (!this.closed) this.onmessage?.({data: {...result, engineID:this.engineID, id: data.id}});
+		}).catch(error => {
+			if (!this.closed && revision === this.revision && error.name !== "AbortError") {
+				this.closeSlot(slot, error);
+				this.parallelism = Math.max(1, this.slots.size + 1);
+				this.requests.set(data.id, this.primary);
+				fallback = true;
+				this.primary.postMessage(data, transfer);
+				return;
+			}
+			if (!this.closed) this.onmessage?.({data: {engineID:this.engineID, id: data.id, ok: false, error: error.message, canceled: error.name === "AbortError"}});
+		}).finally(() => {
+			if (!fallback) this.requests.delete(data.id);
+			slot.busy = false;
+			slot.worker.reservation = 0;
+			const memory = engineScheduler.memory;
+			if (memory > this.budget) { this.closeSlot(slot); this.parallelism = Math.max(1, this.slots.size + 1); }
+			this.dispatchPages();
+			engineScheduler.drain();
+		});
+	}
+
+	terminate() {
+		if (this.closed) return;
+		this.closed = true;
+		this.invalidatePages();
+		this.primary.terminate();
+		this.requests.clear();
+	}
+}
+
+export function saveFilePicker(options) {
+	return nativeHost ? nativeHost.savePicker(options) : window.showSaveFilePicker ? window.showSaveFilePicker(options) : null;
+}
+
+export function directoryPicker() {
+	return nativeHost ? nativeHost.directoryPicker() : window.showDirectoryPicker({mode:"readwrite"});
+}
+
+class NativeFile {
+	constructor(value) {
+		Object.assign(this, value);
+		if (value.handle) this.handle = new NativeHandle(nativeHost, value.handle);
+		this.byteLength = this.size;
+		this.type ||= "application/octet-stream";
+		if (value.temporary) nativeHost?.resources?.register(this, value.nativeFile);
+	}
+
+	async arrayBuffer(signal) {
+		const response = await fetch(this.url, {signal});
+		if (!response.ok) throw new Error("读取文件失败");
+		return response.arrayBuffer();
+	}
+
+	toJSON() {
+		return {nativeFile:this.nativeFile, size:this.size, name:this.name};
+	}
+
+	async text() {
+		return new TextDecoder().decode(await this.arrayBuffer());
+	}
+}
+
+class NativeHandle {
+	constructor(host, value) {
+		this.host = host;
+		Object.assign(this, value);
+	}
+
+	toJSON() {
+		return {nativeHandle:this.nativeHandle, name:this.name, kind:this.kind};
+	}
+
+	async getFile() {
+		return new NativeFile(await this.host.call("file", {handle:this.nativeHandle}));
+	}
+
+	async getFileHandle(name, options = {}) {
+		return new NativeHandle(this.host, await this.host.call("child", {handle:this.nativeHandle, name, create:!!options.create, directory:false}));
+	}
+
+	async getDirectoryHandle(name, options = {}) {
+		return new NativeHandle(this.host, await this.host.call("child", {handle:this.nativeHandle, name, create:!!options.create, directory:true}));
+	}
+
+	removeEntry(name, options = {}) {
+		return this.host.call("remove", {handle:this.nativeHandle, name, recursive:!!options.recursive});
+	}
+
+	async createWritable() {
+		const {writer} = await this.host.call("write.begin", {handle:this.nativeHandle});
+		return {
+			write: data => this.host.call("write.data", {writer, data}),
+			close: () => this.host.call("write.commit", {writer}),
+			abort: () => this.host.call("write.abort", {writer}),
+		};
+	}
+}
+
+class NativeHost {
+	constructor(bridge) {
+		this.bridge = bridge;
+		this.parallelism = 1;
+		this.cacheBytes = 32 * 1024 * 1024;
+		this.reading = 0;
+		this.readQueue = [];
+		this.resources = typeof FinalizationRegistry === "function" ? new FinalizationRegistry(file => {
+			this.call("release", {file}).catch(() => {});
+		}) : null;
+	}
+
+	call(name, value, signal) {
+		return this.bridge.call(`ofdgo.host.${name}`, value, {signal});
+	}
+
+	async readResource(file, signal) {
+		if (this.reading >= this.parallelism) await new Promise(resolve => this.readQueue.push(resolve));
+		else this.reading++;
+		try {
+			signal?.throwIfAborted();
+			return await file.arrayBuffer(signal);
+		} finally {
+			try { await this.call("release", {file:file.nativeFile}); }
+			finally {
+				const next = this.readQueue.shift();
+				if (next) next();
+				else this.reading--;
+			}
+		}
+	}
+
+	async decode(value, signal) {
+		const reads = [];
+		const visit = (item, field, replace) => {
+			if (!item || typeof item !== "object" || item instanceof Blob || item instanceof ArrayBuffer || ArrayBuffer.isView(item)) return;
+			if (item.nativeFile) {
+				const file = new NativeFile(item);
+				if (field === "file") replace(file);
+				else reads.push(this.readResource(file, signal).then(bytes => replace(field === "blob" ? new Blob([bytes], {type:item.type}) : new Uint8Array(bytes))));
+				return;
+			}
+			for (const [child, content] of Object.entries(item)) {
+				if (content && typeof content === "object") visit(content, Array.isArray(item) ? "" : child, result => item[child] = result);
+			}
+		};
+		visit(value, "", result => value = result);
+		const results = await Promise.allSettled(reads);
+		const failed = results.find(result => result.status === "rejected");
+		if (failed) throw failed.reason;
+		return value;
+	}
+
+	async release(value) {
+		if (value instanceof Blob || value instanceof ArrayBuffer || ArrayBuffer.isView(value)) return;
+		if (value?.nativeFile && value.temporary) {
+			await this.call("release", {file:value.nativeFile}).catch(() => {});
+			return;
+		}
+		if (value && typeof value === "object") {
+			for (const item of Object.values(value)) await this.release(item);
+		}
+	}
+
+	worker() {
+		const host = this;
+		let closed = false;
+		let unsubscribe;
+		let pending = Promise.resolve();
+		let termination = null;
+		const readers = new Set();
+		const inputs = new Set();
+		const requests = new Map();
+		const completions = new Map();
+		const emit = data => {
+			if (data.type === "result") { completions.get(data.id)?.(data.result); return; }
+			if (!closed) worker.onmessage?.({data:{...data, engineID:worker.engineID}});
+		};
+		const ready = host.call("engine.open", {}).then(({engine, parallelism, cacheBytes}) => {
+			worker.engineID = engine;
+			if (closed) return engine;
+			host.parallelism = Math.max(1, parallelism || 1);
+			host.cacheBytes = cacheBytes || host.cacheBytes;
+			unsubscribe = host.bridge.on(`ofdgo.engine.${engine}`, emit);
+			emit({type:"ready"});
+			return engine;
+		}).catch(error => { if (!closed) worker.onerror?.({message:error.message}); throw error; });
+		const worker = {
+			engineID:null,
+			foreground:true,
+			pagesPaused:false,
+			onmessage:null,
+			onerror:null,
+			configurePages() {},
+			setForeground(foreground) {
+				worker.foreground = !!foreground;
+				worker.pausePages(!worker.foreground);
+			},
+			pausePages(paused = true) {
+				worker.pagesPaused = !!paused;
+			},
+			postMessage(data) {
+				if (closed) return;
+				if (data.type === "cancel") {
+					requests.get(data.id)?.abort();
+					return;
+				}
+				if (data.type === "font") return;
+				if (["ofdgoDetectFormat", "ofdgoOpen", "ofdgoOpenPDF"].includes(data.name)) {
+					const input = data.args?.[0];
+					if (input?.nativeFile && !input.temporary) inputs.add(input.nativeFile);
+				}
+				const controller = new AbortController();
+				requests.set(data.id, controller);
+				const parallel = data.name === "ofdgoRenderPage";
+				const barrier = parallel ? pending : Promise.all([pending, ...readers]);
+				const operation = barrier.then(async () => {
+					const engine = await ready;
+					if (closed) return;
+					if (data.preload && worker.pagesPaused) throw new DOMException("预加载已暂停", "AbortError");
+					controller.signal.throwIfAborted();
+					const args = {engine, id:data.id, name:data.name, args:data.args};
+					let result;
+					if (data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles") {
+						const completed = new Promise(resolve => completions.set(data.id, resolve));
+						const cancel = () => host.call("engine.cancel", {engine, id:data.id}).catch(() => {});
+						controller.signal.addEventListener("abort", cancel, {once:true});
+						try {
+							await host.call("engine.start", args);
+							if (controller.signal.aborted) cancel();
+							result = await completed;
+							await host.call("engine.finish", {engine, id:data.id});
+						} finally {
+							controller.signal.removeEventListener("abort", cancel);
+							completions.delete(data.id);
+						}
+					} else result = await host.call("engine.call", args, controller.signal);
+					if (closed) { await host.release(result); return; }
+					let decoded;
+					try {
+						controller.signal.throwIfAborted();
+						decoded = await host.decode(result, controller.signal);
+						controller.signal.throwIfAborted();
+					}
+					catch (error) { await host.release(result); throw error; }
+					if (closed) { await host.release(result); return; }
+					emit({id:data.id, ...decoded});
+				}).catch(error => emit({id:data.id, ok:false, error:error.message, code:error.code, canceled:error.name === "AbortError"})).finally(() => requests.delete(data.id));
+				if (parallel) {
+					readers.add(operation);
+					operation.finally(() => readers.delete(operation));
+				} else if (data.name !== "ofdgoSaveSnapshot") pending = operation;
+			},
+			terminate() {
+				if (closed) return termination;
+				closed = true;
+				for (const controller of requests.values()) controller.abort();
+				termination = ready.then(engine => host.call("engine.close", {engine})).catch(() => {}).finally(async () => {
+					unsubscribe?.();
+					for (const resolve of completions.values()) resolve({ok:false, canceled:true, error:"会话已关闭"});
+					completions.clear();
+					await Promise.all([...inputs].map(file => host.call("release", {file}).catch(() => {})));
+					inputs.clear();
+				});
+				return termination;
+			},
+		};
+		ready.catch(() => {});
+		return worker;
+	}
+
+	async savePicker(options) {
+		return new NativeHandle(this, await this.call("save", options));
+	}
+
+	async directoryPicker() {
+		return new NativeHandle(this, await this.call("directory", {}));
+	}
+
+	async fonts() {
+		return (await this.call("fonts", {})).map(({file, ...font}) => ({...font, nativeFile:new NativeFile(file)}));
+	}
+
+	async start(onFiles, onError) {
+		let launching = Promise.resolve();
+		this.bridge.on("ofdgo.launch", values => {
+			launching = launching.then(async () => {
+				try { await onFiles(values.map(value => new NativeFile(value)), true); }
+				finally { await this.call("launch.done", {}); }
+			}).catch(onError);
+		});
+		this.bridge.on("ofdgo.files", async values => {
+			try { await onFiles(values.map(value => new NativeFile(value))); }
+			catch (error) { onError(error); }
+		});
+		this.bridge.on("ofdgo.error", message => onError(new Error(message)));
+		const title = document.querySelector("title");
+		if (title) new MutationObserver(() => this.call("title", {title:document.title}).catch(onError)).observe(title, {childList:true});
+		await this.call("ready", {});
+	}
+
+	async discardFiles(files) {
+		await Promise.all(files.filter(file => file.drop && file.nativeFile).map(file => this.call("drop.release", {file:file.nativeFile})));
+	}
+
+	installFileInputs(onError) {
+		document.addEventListener("click", async event => {
+			const input = event.target;
+			if (!(input instanceof HTMLInputElement) || input.type !== "file" || input.disabled) return;
+			event.preventDefault();
+			try {
+				const files = (await this.call("open", {multiple:input.multiple, directory:input.webkitdirectory, accept:input.accept})).map(value => new NativeFile(value));
+				if (!files.length) return;
+				const transfer = new DataTransfer();
+				for (const file of files) transfer.items.add(new File([], file.name, {type:file.type}));
+				delete input.files;
+				input.files = transfer.files;
+				Object.defineProperty(input, "files", {configurable:true, get:() => input.value ? files : []});
+				input.dispatchEvent(new Event("input", {bubbles:true}));
+				input.dispatchEvent(new Event("change", {bubbles:true}));
+			} catch (error) { if (error.name !== "AbortError") onError(error); }
+		}, true);
+	}
+
+	async download(data, mime, name) {
+		const handle = await this.savePicker({suggestedName:name});
+		const writer = await handle.createWritable();
+		try { await writer.write(data); await writer.close(); }
+		catch (error) { await writer.abort().catch(() => {}); throw error; }
+	}
+}
+
+export const nativeHost = globalThis.guigo ? new NativeHost(globalThis.guigo) : null;

assets/webui/ofdgo_print.js

@@ -0,0 +1,493 @@
+let printQueue = Promise.resolve();
+
+export class PrintDialog {
+	constructor(options) {
+		Object.assign(this, options);
+		const panel = this.panel || document.querySelector("#printPanel");
+		this.el = Object.fromEntries(["Panel", "Form", "Settings", "Printer", "Properties", "Copies", "Collation", "Duplex", "BackReverse", "BackRotate", "Contents", "Scope", "Range", "Parity", "Reverse", "Mode", "Paper", "Width", "Height", "Orientation", "Scaling", "Scale", "MarginTop", "MarginRight", "MarginBottom", "MarginLeft", "Grid", "PageOrder", "Gap", "Binding", "BookletSheets", "SheetFrom", "SheetTo", "Overlap", "Sides", "Rotate", "Grayscale", "Borders", "CropMarks", "Raster", "DPI", "DPIValue", "TileOnlyLarge", "Labels", "Preview", "Previous", "Next", "PreviewNumber", "PageControl", "PageCount", "Status", "Spinner", "ProgressTrack", "ProgressBar", "Cancel", "Submit"].map(name => [name, name === "Panel" ? panel : panel.querySelector(`#print${name}`)]));
+		this.printerOptions = this.el.Printer.innerHTML;
+		this.paperOptions = this.el.Paper.innerHTML;
+		this.settings = new WeakMap();
+		this.queue = Promise.resolve();
+		this.sequence = 0;
+		this.urls = [];
+		this.el.Settings.addEventListener("input", event => { if (event.target === this.el.Printer) this.choosePrinter(); else this.schedule(); });
+		this.el.Properties.addEventListener("click", () => this.properties());
+		this.el.Form.addEventListener("submit", event => { event.preventDefault(); this.print(); });
+		this.el.Cancel.addEventListener("click", () => this.el.Panel.close());
+		this.el.Panel.addEventListener("close", () => this.close());
+		this.el.Panel.addEventListener("cancel", event => { if (this.waiting) event.preventDefault(); });
+		this.el.Previous.addEventListener("click", () => this.preview(this.side - 1));
+		this.el.Next.addEventListener("click", () => this.preview(this.side + 1));
+		this.el.PreviewNumber.addEventListener("change", () => this.preview(Number(this.el.PreviewNumber.value) - 1));
+		this.el.PreviewNumber.addEventListener("keydown", event => {
+			if (event.key !== "Enter") return;
+			event.preventDefault();
+			if (!event.repeat) this.el.PreviewNumber.dispatchEvent(new Event("change"));
+		});
+		this.observer = new ResizeObserver(([entry]) => { this.previewSize = entry.contentRect; this.resize(); });
+		this.observer.observe(this.el.Preview);
+		this.afterPrint = () => { if (this.waiting === "browser") this.finishPrint("打印窗口已关闭"); };
+		this.beforePrint = () => {
+			if (!this.context || !this.el.Panel.open) return;
+			const root = document.querySelector("#ofdgoPrintDocument");
+			if (!root?.children.length) {
+				this.root = root || this.createRoot();
+				this.root.textContent = "请先在OFDGo中打开打印预览，准备完整文档后打印。";
+			}
+		};
+		window.addEventListener("afterprint", this.afterPrint);
+		window.addEventListener("beforeprint", this.beforePrint);
+	}
+
+	open(context) {
+		if (this.context) return;
+		const saved = this.settings.get(context.tab)?.get(context.document);
+		this.context = context;
+		this.restoring = true;
+		this.prepared = false;
+		this.layout = null;
+		this.job = this.profile = null;
+		this.side = 0;
+		this.sequence++;
+		this.el.Printer.innerHTML = this.printerOptions;
+		this.el.Paper.innerHTML = this.paperOptions;
+		this.el.Form.reset();
+		this.orientation = saved?.orientation ?? this.el.Orientation.value;
+		this.duplexBeforeBooklet = saved?.duplex ?? this.el.Duplex.value;
+		this.scalingBeforeBooklet = saved?.scaling ?? this.el.Scaling.value;
+		this.restore(saved);
+		this.mode = this.el.Mode.value;
+		if (!saved) this.el.Scope.value = context.selection.length ? "selected" : "all";
+		this.el.Scope.querySelector('option[value="selected"]').disabled = !context.selection.length;
+		this.el.Sides.value = this.manual() ? "front" : "all";
+		if (!saved) this.el.Contents.value = context.annotations ? "documentAndAnnotations" : "document";
+		this.status();
+		this.el.Preview.replaceChildren();
+		this.show(this.el.Panel);
+		this.loadDevices(saved);
+	}
+
+	isDevice() { return this.el.Printer.value.startsWith("device:"); }
+	manual() { return this.el.Duplex.value.startsWith("manual"); }
+
+	async loadDevices(saved) {
+		const sequence = ++this.sequence;
+		const selected = saved?.values.Printer;
+		this.loading = true;
+		this.controls();
+		const browser = this.el.Printer.querySelector('option[value="browser"]');
+		browser.disabled = !!this.nativeHost || typeof window.print !== "function";
+		if (browser.disabled) this.el.Printer.value = "pdf";
+		try {
+			if (this.nativeHost) {
+				this.status("正在读取设备", true);
+				const capabilities = await this.nativeHost.call("print.capabilities", {});
+				if (!this.current(sequence)) return;
+				this.capabilities = capabilities;
+				browser.disabled = !capabilities.systemDialog;
+				const printers = capabilities.direct ? await this.nativeHost.call("print.printers", {}) : [];
+				if (!this.current(sequence)) return;
+				for (const printer of printers) this.el.Printer.add(new Option(printer.name, `device:${printer.name}`));
+				const printer = printers.find(printer => printer.default) || printers[0];
+				this.el.Printer.value = printer ? `device:${printer.name}` : "pdf";
+			}
+		} catch (error) { if (this.current(sequence)) this.status(error.message); }
+		finally {
+			if (this.current(sequence)) {
+				this.loading = false;
+				if ([...this.el.Printer.options].some(option => option.value === selected && !option.disabled)) this.el.Printer.value = selected;
+				await this.choosePrinter(this.el.Printer.value === selected ? saved : null);
+			}
+		}
+	}
+
+	async choosePrinter(saved) {
+		const sequence = ++this.sequence;
+		const paper = this.el.Paper.value;
+		this.layout = this.job = this.profile = null;
+		this.loading = true;
+		this.status();
+		this.controls();
+		if (!this.isDevice()) {
+			this.el.Paper.innerHTML = this.paperOptions;
+			this.el.Paper.value = paper;
+			if (!this.el.Paper.value) {
+				const [width, height] = paper.split(",").map(Number);
+				if (width > 0 && height > 0 && Number.isFinite(width) && Number.isFinite(height)) {
+					this.el.Paper.value = "custom";
+					this.el.Width.value = width;
+					this.el.Height.value = height;
+				} else this.el.Paper.value = "210,297";
+			}
+		}
+		this.el.Properties.hidden = true;
+		try {
+			if (this.isDevice()) {
+				this.status("正在读取纸张", true);
+				const profile = await this.nativeHost.call("print.query", {printer:this.el.Printer.value.slice(7), copies:1, duplex:"simplex"});
+				if (!this.current(sequence)) return;
+				this.profile = profile;
+				this.el.Paper.replaceChildren(...profile.papers.map(paper => new Option(paper.name, `${paper.width},${paper.height}`)));
+				if (profile.customPaper) this.el.Paper.add(new Option("自定义", "custom"));
+				this.el.Paper.value = `${profile.options.width},${profile.options.height}`;
+				if (!this.el.Paper.value && profile.customPaper) { this.el.Paper.value = "custom"; this.el.Width.value = profile.options.width; this.el.Height.value = profile.options.height; }
+				if (!this.el.Paper.value) throw new Error("设备默认纸张不在支持列表中");
+				this.el.Orientation.value = profile.options.orientation;
+				this.el.Copies.max = Math.min(999, profile.maxCopies || 999);
+				this.el.Copies.value = 1;
+				this.el.Grayscale.checked = profile.options.color === "grayscale";
+				this.el.Grayscale.disabled = !profile.color;
+				this.el.Properties.hidden = !profile.properties;
+			} else this.el.Grayscale.disabled = false;
+		} catch (error) { if (this.current(sequence)) { this.status(error.message); return; } }
+		finally { if (this.current(sequence)) { this.loading = false; this.controls(); } }
+		if (this.current(sequence)) {
+			this.restore(saved);
+			if (this.el.Scope.value === "selected" && !this.context.selection.length) this.el.Scope.value = "all";
+			this.restoring = false;
+			this.schedule();
+		}
+	}
+
+	async properties() {
+		if (!this.isDevice() || this.running || this.loading) return;
+		const sequence = this.sequence;
+		this.loading = true;
+		this.status("正在打开属性", true);
+		this.controls();
+		try { await this.nativeHost.call("print.properties", {printer:this.el.Printer.value.slice(7)}); }
+		catch (error) { if (this.current(sequence)) this.status(error.message); }
+		finally { if (this.current(sequence)) { this.loading = false; await this.choosePrinter(); } }
+	}
+
+	deviceOptions() {
+		const [width, height] = this.el.Paper.value === "custom" ? [Number(this.el.Width.value), Number(this.el.Height.value)] : this.el.Paper.value.split(",").map(Number);
+		const manual = this.manual(), partial = this.el.Sides.value !== "all";
+		return {printer:this.el.Printer.value.slice(7), width, height, orientation:this.el.Orientation.value,
+			copies:Number(this.el.Copies.value), collation:this.el.Collation.checked ? "collated" : "uncollated",
+			duplex:manual || partial ? "simplex" : this.el.Duplex.value, color:this.el.Grayscale.checked ? "grayscale" : "color",
+			scale:1, pagesPerSide:1, margins:{top:0,right:0,bottom:0,left:0},
+			...(this.capabilities?.backgrounds ? {backgrounds:true} : {}), ...(this.capabilities?.headersFooters ? {headersFooters:false} : {})};
+	}
+
+	options(profile) {
+		const el = this.el;
+		const number = name => {
+			const value = Number(el[name].value);
+			if (!el[name].value.trim() || !Number.isFinite(value)) throw new Error("请输入有效数值");
+			return value;
+		};
+		let [paperWidth, paperHeight] = el.Paper.value === "source" ? [0, 0] : el.Paper.value === "custom" ? [number("Width"), number("Height")] : el.Paper.value.split(",").map(Number);
+		if (el.Orientation.value === "landscape") [paperWidth, paperHeight] = [paperHeight, paperWidth];
+		if (profile) [paperWidth, paperHeight] = [profile.width, profile.height];
+		const scope = el.Scope.value;
+		const [rows, columns] = el.Grid.value.split(",").map(Number);
+		if (scope === "selected" && !this.context.selection.length) throw new Error("未选择页面");
+		if (scope === "range" && !el.Range.value.trim()) throw new Error("请输入页码范围");
+		const manual = this.manual(), duplex = el.Duplex.value.replace("manualL", "l").replace("manualS", "s");
+		if (manual && this.isDevice() && number("Copies") !== 1) throw new Error("手动双面每次仅支持1份");
+		return {
+			...(scope === "current" ? {pages:[this.context.page]} : scope === "selected" ? {pages:this.context.selection} : scope === "range" ? {pageRange:el.Range.value.trim()} : {}),
+			mode:el.Mode.value, scaling:el.Scaling.value, paperWidth, paperHeight,
+			margins:{top:number("MarginTop"), right:number("MarginRight"), bottom:number("MarginBottom"), left:number("MarginLeft")},
+			...(profile ? {printableArea:{x:profile.printableArea.x, y:profile.printableArea.y, w:profile.printableArea.width, h:profile.printableArea.height}} : {}),
+			copies:this.isDevice() ? number("Copies") : 1, collate:el.Collation.checked, duplex,
+			scale:el.Scale.disabled ? 1 : number("Scale") / 100, rotate:el.Rotate.checked, reverse:el.Reverse.checked !== (manual && el.Sides.value === "back" && el.BackReverse.checked), parity:el.Parity.value, sides:el.Sides.value,
+			backRotate:manual && el.BackRotate.checked,
+			rows, columns, pageOrder:el.PageOrder.value, gap:el.Gap.disabled ? 0 : number("Gap"), binding:el.Binding.value, bookletSheets:!el.BookletSheets.disabled && el.BookletSheets.value ? number("BookletSheets") : 0, overlap:el.Overlap.disabled ? 0 : number("Overlap"),
+			...(el.Mode.value === "booklet" ? {sheetFrom:el.SheetFrom.value ? number("SheetFrom") : 0, sheetTo:el.SheetTo.value ? number("SheetTo") : 0} : {}),
+			contents:el.Contents.value, grayscale:el.Grayscale.checked, borders:el.Borders.checked, cropMarks:el.CropMarks.checked, raster:el.Raster.checked, dpi:number("DPI"), tileOnlyLarge:el.TileOnlyLarge.checked, labels:el.Labels.checked
+		};
+	}
+
+	schedule() {
+		const el = this.el, mode = el.Mode.value;
+		const source = el.Paper.querySelector('option[value="source"]');
+		if (source) source.disabled = mode !== "single";
+		if (mode !== "single" && el.Paper.value === "source") el.Paper.value = "210,297";
+		if (mode === "booklet" && this.mode !== "booklet") {
+			this.orientation = el.Orientation.value;
+			this.duplexBeforeBooklet = el.Duplex.value;
+			this.scalingBeforeBooklet = el.Scaling.value;
+			el.Scaling.value = "shrink";
+			el.Duplex.value = this.isDevice() && !this.profile?.duplex ? "manualShortEdge" : "shortEdge";
+		} else if (mode !== "booklet" && this.mode === "booklet") {
+			el.Orientation.value = this.orientation;
+			el.Duplex.value = this.duplexBeforeBooklet;
+			el.Scaling.value = this.scalingBeforeBooklet;
+		}
+		if (mode === "booklet") el.Orientation.value = "landscape";
+		this.mode = mode;
+		if (this.isDevice() && !this.profile?.duplex && ["longEdge", "shortEdge"].includes(el.Duplex.value)) el.Duplex.value = el.Duplex.value === "longEdge" ? "manualLongEdge" : "manualShortEdge";
+		if (mode === "booklet" && el.Duplex.value === "simplex") el.Duplex.value = this.isDevice() && !this.profile?.duplex ? "manualShortEdge" : "shortEdge";
+		if (el.Duplex.value === "simplex") el.Sides.value = "all";
+		const isManual = this.manual();
+		el.Sides.querySelector('option[value="all"]').disabled = isManual;
+		if (isManual && el.Sides.value === "all") el.Sides.value = "front";
+		for (const option of el.Duplex.options) option.disabled = this.isDevice() && !this.profile?.duplex && ["longEdge", "shortEdge"].includes(option.value) || mode === "booklet" && ["simplex", "longEdge", "manualLongEdge"].includes(option.value);
+		el.Orientation.disabled = mode === "booklet" || el.Paper.value === "source";
+		const rows = {device:this.isDevice(), sides:el.Duplex.value !== "simplex", manual:isManual, range:el.Scope.value === "range", paper:el.Paper.value === "custom", scale:el.Scaling.value === "custom" || mode === "poster", multiple:mode === "multiple", gap:mode === "multiple" || mode === "booklet", booklet:mode === "booklet", poster:mode === "poster"};
+		for (const row of el.Panel.querySelectorAll("[data-print-row]")) {
+			row.hidden = !rows[row.dataset.printRow];
+			for (const input of row.querySelectorAll("input, select")) input.disabled = row.hidden;
+		}
+		el.Scaling.disabled = mode === "poster" || mode === "booklet";
+		el.DPI.disabled = !el.Raster.checked && !el.Grayscale.checked;
+		const sequence = ++this.sequence;
+		this.layout = null;
+		this.job = null;
+		this.status();
+		this.controls();
+		clearTimeout(this.timer);
+		this.timer = setTimeout(() => {
+			this.queue = this.queue.catch(() => {}).then(() => this.refresh(sequence));
+		}, 160);
+	}
+
+	async refresh(sequence) {
+		if (!this.current(sequence)) return;
+		const context = this.context;
+		try {
+			if (!this.el.Form.checkValidity()) {
+				if (this.el.Panel.open) this.el.Form.reportValidity();
+				else this.status("请检查打印设置");
+				return;
+			}
+			this.status("正在准备预览", true);
+			const deviceOptions = this.isDevice() ? this.deviceOptions() : null;
+			const profile = deviceOptions ? await this.nativeHost.call("print.query", deviceOptions) : null;
+			if (!this.current(sequence)) return;
+			this.profile = profile;
+			const options = this.options(profile);
+			const layout = await context.call(this.prepared ? "ofdgoLayoutPrint" : "ofdgoPreparePrint", options);
+			if (!this.current(sequence)) return;
+			this.prepared = true;
+			this.layout = layout;
+			if (this.isDevice()) this.el.Copies.max = Math.min(999, this.profile.maxCopies || 999, layout.copiesLimit > 0 ? layout.copiesLimit : 999);
+			await this.preview(Math.min(this.side, layout.sides.length - 1));
+			if (!this.current(sequence) || this.layout !== layout) return;
+			this.job = {deviceOptions, fingerprint:profile?.fingerprint, manual:this.manual(), sides:options.sides, backContent:layout.backContent};
+			this.status();
+			if (layout.sides.some(side => side.placements.some(placement => placement.clipped))) this.status("内容超出可打印区域");
+			if (this.manual() && options.sides === "back" && !layout.backContent) this.status("背面为空白");
+		} catch (error) {
+			if (this.current(sequence)) this.status(error.code === "printDenied" ? "文档禁止打印" : error.message);
+		} finally {
+			if (this.current(sequence)) this.controls();
+		}
+	}
+
+	current(sequence = this.sequence) { return sequence === this.sequence && this.context && !this.context.tab.closed; }
+
+	async preview(index) {
+		if (!this.layout || this.running) return;
+		if (!Number.isInteger(index) || index < 0 || index >= this.layout.sides.length) { this.controls(); return; }
+		const sequence = this.sequence, preview = this.previewSequence = (this.previewSequence || 0) + 1;
+		this.side = index;
+		this.controls();
+		try {
+			let {svg} = await this.context.call("ofdgoPrintSide", index);
+			if (!this.current(sequence) || preview !== this.previewSequence) return;
+			if (this.profile) {
+				const area = this.profile.printableArea;
+				svg = svg.replace("</svg>", `<rect x="${area.x}" y="${area.y}" width="${area.width}" height="${area.height}" fill="none" stroke="#88949e" stroke-width="0.2" stroke-dasharray="1 1"/></svg>`);
+			}
+			const url = URL.createObjectURL(new Blob([svg], {type:"image/svg+xml"}));
+			const img = new Image();
+			img.src = url;
+			try { await img.decode(); } catch (error) { URL.revokeObjectURL(url); throw error; }
+			if (!this.current(sequence) || preview !== this.previewSequence) { URL.revokeObjectURL(url); return; }
+			if (this.previewURL) URL.revokeObjectURL(this.previewURL);
+			this.previewURL = url;
+			this.el.Preview.replaceChildren(img);
+			this.resize();
+		} catch (error) { if (this.current(sequence) && preview === this.previewSequence) { this.status(error.message); this.layout = null; this.controls(); } }
+	}
+
+	resize() {
+		const img = this.el.Preview.querySelector("img"), side = this.layout?.sides[this.side];
+		if (!img || !side || !this.previewSize) return;
+		const factor = Math.min(this.previewSize.width / side.width, this.previewSize.height / side.height);
+		img.style.width = `${Math.max(1, side.width * factor)}px`;
+		img.style.height = `${Math.max(1, side.height * factor)}px`;
+	}
+
+	status(text = "", busy = false, completed = 0, total = 0) {
+		this.el.Status.textContent = total ? `${text} · ${completed} / ${total}` : text;
+		this.el.Spinner.hidden = !busy;
+		this.el.ProgressTrack.hidden = !busy || !total;
+		this.el.ProgressBar.style.width = `${total ? completed / total * 100 : 0}%`;
+	}
+
+	controls() {
+		const count = this.layout?.sides.length || 0, busy = !!this.running || !!this.loading;
+		this.el.DPIValue.textContent = this.el.DPI.value;
+		this.el.Settings.disabled = busy;
+		this.el.Submit.disabled = !count || !this.job || busy;
+		if (this.el.Printer.value !== "pdf" && this.manual() && this.el.Sides.value === "back" && !this.layout?.backContent) this.el.Submit.disabled = true;
+		this.el.Previous.disabled = busy || !count || this.side === 0;
+		this.el.Next.disabled = busy || !count || this.side + 1 === count;
+		this.el.PreviewNumber.disabled = busy || !count;
+		this.el.PreviewNumber.max = count || 1;
+		this.el.PreviewNumber.value = count ? this.side + 1 : 1;
+		this.el.PageCount.textContent = String(count);
+		this.el.PageControl.style.setProperty("--page-width", `${String(count || 1).length + 0.5}ch`);
+		this.el.Cancel.textContent = busy && !this.waiting ? "取消" : "关闭";
+		this.el.Cancel.disabled = !!this.waiting;
+	}
+
+	restore(saved) {
+		for (const [name, value] of Object.entries(saved?.values || {})) {
+			if (name === "Printer") continue;
+			const node = this.el[name];
+			if (node.type === "checkbox") node.checked = value;
+			else if (!node.options || [...node.options].some(option => option.value === value)) node.value = value;
+		}
+	}
+
+	remember() {
+		const context = this.context;
+		if (!context || this.restoring) return;
+		let settings = this.settings.get(context.tab);
+		if (!settings) this.settings.set(context.tab, settings = new Map());
+		const values = {};
+		for (const [name, node] of Object.entries(this.el)) if (node.closest("#printSettings") && name !== "Sides" && node.matches("input, select")) values[name] = node.type === "checkbox" ? node.checked : node.value;
+		settings.set(context.document, {values, orientation:this.orientation, duplex:this.duplexBeforeBooklet, scaling:this.scalingBeforeBooklet});
+	}
+
+	createRoot() {
+		const root = document.createElement("div");
+		root.id = "ofdgoPrintDocument";
+		document.body.append(root);
+		return root;
+	}
+
+	async print() {
+		if (!this.layout || !this.job || this.running) return;
+		this.previewSequence++;
+		if (this.el.Printer.value === "pdf") return this.pdf();
+		const sequence = this.sequence, context = this.context;
+		const job = this.job;
+		this.running = true;
+		this.controls();
+		this.status("正在等待打印", true);
+		const previous = printQueue;
+		let release;
+		printQueue = new Promise(resolve => { release = resolve; });
+		await previous;
+		if (!this.current(sequence)) { release(); return; }
+		this.releasePrint = release;
+		try {
+			this.root = document.querySelector("#ofdgoPrintDocument") || this.createRoot();
+			this.root.replaceChildren();
+			const style = document.createElement("style");
+			style.textContent = this.layout.sides.map((side, i) => `@page ofdgoPrint${i}{size:${side.width}mm ${side.height}mm;margin:0}`).join("");
+			this.root.append(style);
+			this.status("正在准备纸面", true, 0, this.layout.sides.length);
+			for (let i = 0; i < this.layout.sides.length; i++) {
+				if (!this.current(sequence)) throw new DOMException("打印已取消", "AbortError");
+				const {svg} = await context.call("ofdgoPrintSide", i);
+				if (!this.current(sequence)) throw new DOMException("打印已取消", "AbortError");
+				const url = URL.createObjectURL(new Blob([svg], {type:"image/svg+xml"}));
+				this.urls.push(url);
+				const img = new Image(), section = document.createElement("section"), side = this.layout.sides[i];
+				img.src = url;
+				section.append(img);
+				section.style.cssText = `page:ofdgoPrint${i};width:${side.width}mm;height:${side.height}mm`;
+				this.root.append(section);
+				await img.decode();
+				if (this.current(sequence)) this.status("正在准备纸面", true, i + 1, this.layout.sides.length);
+			}
+			await document.fonts.ready;
+			if (!this.current(sequence)) throw new DOMException("打印已取消", "AbortError");
+			if (this.el.Panel.open) {
+				this.previousTitle = document.title;
+				document.title = this.printTitle = context.name;
+			}
+			this.waiting = this.nativeHost ? "native" : "browser";
+			this.controls();
+			this.status(job.deviceOptions ? "正在提交打印" : "正在打开打印", true);
+			if (job.deviceOptions) {
+				const result = await this.nativeHost.call("print", {...job.deviceOptions, fingerprint:job.fingerprint});
+				this.finishPrint(result?.submitted ? "打印已提交" : "打印作业未被接受");
+				if (this.current(sequence) && result?.submitted && job.manual && job.sides === "front") {
+					if (job.backContent) { this.el.Sides.value = "back"; this.schedule(); }
+					else this.status("背面为空白");
+				}
+			} else if (this.nativeHost) {
+				const capabilities = await this.nativeHost.call("print.capabilities", {});
+				if (!this.current(sequence)) throw new DOMException("打印已取消", "AbortError");
+				if (!capabilities.systemDialog) throw new Error("当前运行时不支持系统打印");
+				if (!capabilities.dialogCompletion) this.waiting = "browser";
+				await this.nativeHost.call("print.dialog", {kind:"system"});
+				if (capabilities.dialogCompletion) this.finishPrint("打印窗口已关闭");
+			} else if (typeof window.print === "function") window.print();
+			else throw new Error("当前浏览器不支持打印");
+		} catch (error) {
+			if (this.releasePrint === release) this.finishPrint();
+			if (this.current(sequence)) {
+				this.status(error.name === "AbortError" ? "打印已取消" : error.message);
+			}
+		} finally {
+			if (this.current(sequence)) {
+				if (!this.waiting) this.running = false;
+				this.controls();
+			}
+		}
+	}
+
+	finishPrint(message = "") {
+		if (this.previousTitle !== undefined) {
+			if (document.title === this.printTitle) document.title = this.previousTitle;
+			delete this.previousTitle;
+		}
+		if (this.releasePrint) this.root?.replaceChildren();
+		for (const url of this.urls) URL.revokeObjectURL(url);
+		this.urls = [];
+		this.releasePrint?.();
+		this.releasePrint = null;
+		this.status(message);
+		this.waiting = this.running = false;
+		this.controls();
+		if (this.destroyed) window.removeEventListener("afterprint", this.afterPrint);
+	}
+
+	async pdf() {
+		if (!this.layout || this.running) return;
+		const sequence = this.sequence, context = this.context;
+		this.running = true;
+		this.controls();
+		this.status("正在生成文件", true);
+		try {
+			const result = await context.call("ofdgoPrintPDF");
+			if (this.current(sequence)) {
+				await this.download(result.bytes, "application/pdf", `${context.name.replace(/\.[^.]+$/, "")}-打印.pdf`);
+				if (this.current(sequence)) this.status("文件已生成");
+			}
+		} catch (error) { if (this.current(sequence)) this.status(error.message); }
+		finally { if (this.current(sequence)) { this.running = false; this.controls(); } }
+	}
+
+	close() {
+		const context = this.context;
+		this.remember();
+		this.sequence++;
+		clearTimeout(this.timer);
+		if (context) this.cancel(context.tab);
+		if (!this.waiting) this.finishPrint();
+		if (this.previewURL) URL.revokeObjectURL(this.previewURL);
+		this.previewURL = null;
+		this.el.Preview.replaceChildren();
+		this.context = null;
+		this.queue = this.queue.catch(() => {}).then(() => context?.call("ofdgoDiscardPrint").catch(() => {}));
+	}
+
+	destroy() {
+		this.destroyed = true;
+		this.close();
+		this.observer.disconnect();
+		window.removeEventListener("beforeprint", this.beforePrint);
+		if (!this.waiting) window.removeEventListener("afterprint", this.afterPrint);
+	}
+}

assets/webui/ofdgo_theme.js

@@ -0,0 +1,42 @@
+(() => {
+	const root = document.documentElement;
+	const preference = matchMedia("(prefers-color-scheme: dark)");
+	const key = "ofdgo.theme";
+	let mode = root.dataset.themeMode || "system";
+	let host = null, report = null, pending = Promise.resolve();
+	if (!root.dataset.themeMode) {
+		try { mode = localStorage.getItem(key) || "system"; } catch {}
+	}
+	if (!["system", "light", "dark"].includes(mode)) mode = "system";
+	function apply() {
+		root.dataset.themeMode = mode;
+		root.dataset.theme = mode === "system" ? preference.matches ? "dark" : "light" : mode;
+		document.querySelector('meta[name="theme-color"]').content = root.dataset.theme === "dark" ? "#272e33" : "#fafbfc";
+		for (const button of document.querySelectorAll("[data-theme-choice]")) button.dataset.pressed = String(button.dataset.themeChoice === mode);
+	}
+	function sync() {
+		if (!host) return;
+		const value = {mode, dark: root.dataset.theme === "dark"};
+		pending = pending.then(() => host.call("appearance", value)).catch(error => report(error));
+	}
+	function set(value) {
+		mode = value;
+		apply();
+		if (!host) {
+			try { localStorage.setItem(key, mode); } catch {}
+		}
+		sync();
+	}
+	preference.addEventListener("change", () => {
+		if (mode !== "system") return;
+		apply();
+		sync();
+	});
+	window.addEventListener("storage", event => {
+		if (host || event.key !== key && event.key !== null) return;
+		mode = ["light", "dark"].includes(event.newValue) ? event.newValue : "system";
+		apply();
+	});
+	window.ofdgoTheme = {set, connect(value, onError) { host = value; report = onError; apply(); sync(); }};
+	apply();
+})();

assets/webui/ofdgo_util.js

@@ -0,0 +1,550 @@
+export class DocumentDialogs {
+	constructor({ document: root = document, targets = [], titlebar = null } = {}) {
+		Object.assign(this, { document: root, targets, titlebar, owner: null, records: new Map(), tabs: new Map(), released: new WeakSet(), inert: new Map(), styles: new Map() });
+		this.backdrop = root.createElement("div");
+		this.backdrop.className = "document-dialog-backdrop";
+		this.backdrop.hidden = true;
+		Object.assign(this.backdrop.style, { position: "fixed", inset: "0", background: "var(--backdrop)", zIndex: "1000" });
+		root.body.append(this.backdrop);
+		root.addEventListener("keydown", event => {
+			if (event.defaultPrevented || this.applicationOpen()) return;
+			const panel = this.current()?.stack.at(-1);
+			if (!panel) return;
+			if (event.key === "Tab" && !event.ctrlKey && !event.altKey && !event.metaKey) {
+				const selector = "button, input, select, textarea, a[href], [tabindex], [contenteditable=true]";
+				const elements = [this.titlebar, panel].filter(Boolean).flatMap(root => [...root.querySelectorAll(selector)])
+					.filter(node => node.tabIndex >= 0 && !node.disabled && !node.closest("[inert]") && node.getClientRects().length);
+				const index = elements.indexOf(root.activeElement), direction = event.shiftKey ? -1 : 1;
+				const target = index < 0 ? event.shiftKey ? elements.at(-1) : elements[0] : elements[(index + direction + elements.length) % elements.length];
+				event.preventDefault();
+				if (target) target.focus();
+				else panel.focus();
+				return;
+			}
+			if (event.key !== "Escape") return;
+			event.preventDefault();
+			event.stopPropagation();
+			this.cancel(panel);
+		}, true);
+		this.backdrop.addEventListener("pointerdown", event => { event.preventDefault(); this.focus(); });
+		root.defaultView.addEventListener("resize", () => this.paint());
+	}
+
+	register(panel, { shared = true, persistent = false } = {}) {
+		if (this.records.has(panel)) return panel;
+		const record = { show: panel.show.bind(panel), showModal: panel.showModal.bind(panel), close: panel.close.bind(panel), owner: null, application: false, shared, clicks: new WeakMap(), initial: shared && !persistent ? this.snapshot(panel) : null };
+		this.records.set(panel, record);
+		panel.showModal = panel.show = () => this.openFor(this.owner, panel);
+		panel.close = value => {
+			if (record.application) record.close(value);
+			else this.closeFor(this.owner, panel, value);
+		};
+		panel.requestClose = value => {
+			if (record.application) {
+				const event = new this.document.defaultView.Event("cancel", { cancelable: true });
+				if (panel.dispatchEvent(event)) record.close(value);
+			} else this.cancel(panel, value);
+		};
+		panel.addEventListener("close", () => {
+			if (record.application) { record.application = false; this.paint(); }
+		});
+		panel.addEventListener("click", event => { record.clicks.set(event, this.owner); }, true);
+		panel.addEventListener("click", event => {
+			if (!record.application && (record.clicks.get(event) !== this.owner || !this.current()?.stack.includes(panel))) event.preventDefault();
+		});
+		panel.addEventListener("submit", event => {
+			if (record.application || event.defaultPrevented) return;
+			const method = event.submitter?.getAttribute("formmethod") || event.target.getAttribute("method");
+			if (method?.toLowerCase() !== "dialog") return;
+			event.preventDefault();
+			this.closeFor(this.owner, panel, event.submitter?.value || "");
+		});
+		return panel;
+	}
+
+	current(tab = this.owner) {
+		return tab ? this.tabs.get(tab) : null;
+	}
+
+	entry(tab, panel) {
+		if (!tab || this.released.has(tab)) throw new Error("Document dialog owner is unavailable");
+		this.register(panel);
+		if (!this.tabs.has(tab)) this.tabs.set(tab, { entries: new Map(), stack: [] });
+		const entries = this.tabs.get(tab).entries;
+		if (!entries.has(panel)) entries.set(panel, { snapshot: this.records.get(panel).initial, setup: [], updates: [], resolve: null, promise: null });
+		return entries.get(panel);
+	}
+
+	setOwner(tab) {
+		if (this.owner === tab) return;
+		if (this.owner) this.suspend(this.owner);
+		if (tab) this.restore(tab);
+	}
+
+	openFor(tab, panel, setup) {
+		const entry = this.entry(tab, panel);
+		if (setup) entry.setup.push(setup);
+		const state = this.tabs.get(tab);
+		state.stack = state.stack.filter(value => value !== panel);
+		state.stack.push(panel);
+		if (tab !== this.owner) return panel;
+		this.unpaint();
+		this.records.get(panel).owner = tab;
+		this.prepare(entry, panel);
+		if (!this.records.get(panel).shared) this.document.body.append(panel);
+		if (!panel.open) this.records.get(panel).show();
+		this.paint();
+		this.focus();
+		return panel;
+	}
+
+	request(panel, tab = this.owner, setup) {
+		if (!tab || this.released.has(tab)) return Promise.resolve(null);
+		const entry = this.entry(tab, panel);
+		if (entry.promise) return entry.promise;
+		entry.promise = new Promise(resolve => { entry.resolve = resolve; });
+		const promise = entry.promise;
+		this.openFor(tab, panel, setup);
+		return promise;
+	}
+
+	updateFor(tab, panel, setup) {
+		if (!tab || this.released.has(tab)) return false;
+		const entry = this.current(tab)?.entries.get(panel);
+		if (!entry) return false;
+		if (tab === this.owner && this.records.get(panel).owner === tab) setup(panel);
+		else entry.updates.push(setup);
+		return true;
+	}
+
+	closeFor(tab, panel, value) {
+		const state = this.current(tab), entry = state?.entries.get(panel);
+		if (!state?.stack.includes(panel)) return;
+		const visible = tab === this.owner;
+		if (visible) {
+			this.unpaint();
+			if (value !== undefined) panel.returnValue = String(value);
+			panel.removeAttribute("open");
+			if (this.records.get(panel).initial) entry.snapshot = this.snapshot(panel);
+		}
+		const result = value === undefined ? visible ? panel.returnValue : entry.snapshot?.returnValue ?? panel.returnValue : String(value);
+		state.stack = state.stack.filter(value => value !== panel);
+		const resolve = entry.resolve;
+		entry.resolve = entry.promise = null;
+		entry.setup = [];
+		if (visible) {
+			this.paint();
+			panel.dispatchEvent(new this.document.defaultView.Event("close"));
+			this.focus();
+		}
+		resolve?.(result);
+	}
+
+	cancel(panel, value) {
+		const event = new this.document.defaultView.Event("cancel", { cancelable: true });
+		if (panel.dispatchEvent(event)) this.closeFor(this.owner, panel, value);
+	}
+
+	suspend(tab) {
+		if (tab !== this.owner) return;
+		this.unpaint();
+		for (const [panel, entry] of this.current(tab)?.entries || []) {
+			const record = this.records.get(panel);
+			if (record.application || record.owner !== tab) continue;
+			if (record.initial) entry.snapshot = this.snapshot(panel);
+			else if (!record.shared) {
+				entry.focus = panel.contains(this.document.activeElement) ? this.document.activeElement : null;
+				panel.remove();
+			}
+			panel.removeAttribute("open");
+		}
+		this.owner = null;
+		this.paint();
+	}
+
+	restore(tab) {
+		if (!tab || this.released.has(tab)) return false;
+		if (this.owner === tab) return true;
+		if (this.owner) this.suspend(this.owner);
+		if (!this.tabs.has(tab)) this.tabs.set(tab, { entries: new Map(), stack: [] });
+		this.owner = tab;
+		const state = this.current(tab);
+		for (const [panel, entry] of state.entries) {
+			const record = this.records.get(panel);
+			if (record.application) continue;
+			if (record.initial) this.applySnapshot(entry.snapshot, panel);
+			else if (!record.shared) this.document.body.append(panel);
+			record.owner = tab;
+		}
+		for (const [panel, entry] of state.entries) {
+			if (this.records.get(panel).application) continue;
+			for (const update of entry.updates.splice(0)) update(panel);
+		}
+		for (const panel of state.stack) {
+			this.prepare(state.entries.get(panel), panel);
+			if (!panel.open) this.records.get(panel).show();
+		}
+		this.paint();
+		this.focus(true);
+		return true;
+	}
+
+	release(tab) {
+		if (!tab || this.released.has(tab)) return;
+		const visible = this.owner === tab;
+		if (visible) this.suspend(tab);
+		const state = this.current(tab);
+		this.tabs.delete(tab);
+		this.released.add(tab);
+		for (const entry of state?.entries.values() || []) entry.resolve?.(null);
+		for (const [panel] of state?.entries || []) {
+			const record = this.records.get(panel);
+			if (!record.shared) {
+				panel.remove();
+				this.records.delete(panel);
+				continue;
+			}
+			if (record.application || record.owner !== tab) continue;
+			if (record.initial) this.applySnapshot(record.initial, panel);
+			record.owner = null;
+		}
+		state?.entries.clear();
+		if (state) state.stack.length = 0;
+	}
+
+	showApplication(panel) {
+		this.register(panel);
+		if ([...this.tabs.values()].some(state => state.stack.includes(panel))) throw new Error("Document dialog is already in use");
+		const record = this.records.get(panel);
+		record.application = true;
+		try { record.showModal(); }
+		catch (error) { record.application = false; throw error; }
+	}
+
+	applicationOpen() {
+		return [...this.records.values()].some(record => record.application);
+	}
+
+	prepare(entry, panel) {
+		for (const setup of entry.setup.splice(0)) setup(panel);
+	}
+
+	snapshot(panel) {
+		const nodes = [panel, ...panel.querySelectorAll("*")].map(node => ({ node,
+			children: [...node.childNodes], attributes: [...node.attributes].filter(attribute => node !== panel || attribute.name !== "open").map(attribute => [attribute.name, attribute.value]),
+			value: "value" in node && node.type !== "file" ? node.value : undefined,
+			checked: node.checked, indeterminate: node.indeterminate, selected: node.selected,
+			files: node.type === "file" ? [...node.files] : undefined, scrollTop: node.scrollTop, scrollLeft: node.scrollLeft,
+			selectionStart: node.selectionStart, selectionEnd: node.selectionEnd, selectionDirection: node.selectionDirection,
+			text: [...node.childNodes].filter(child => child.nodeType === 3).map(child => [child, child.data]) }));
+		const focus = panel.contains(this.document.activeElement) ? this.document.activeElement : null;
+		const range = this.document.getSelection();
+		const selection = !focus?.matches("input, textarea") && range?.anchorNode && panel.contains(range.anchorNode) && panel.contains(range.focusNode)
+			? { anchor: range.anchorNode, start: range.anchorOffset, focus: range.focusNode, end: range.focusOffset } : null;
+		return { nodes, focus, selection, returnValue: panel.returnValue };
+	}
+
+	applySnapshot(snapshot, panel) {
+		panel.removeAttribute("open");
+		for (const item of snapshot.nodes) {
+			const { node, children, attributes } = item;
+			if (node.childNodes.length !== children.length || children.some((child, index) => node.childNodes[index] !== child)) node.replaceChildren(...children);
+			for (const attribute of [...node.attributes]) if (!attributes.some(([name]) => name === attribute.name)) node.removeAttribute(attribute.name);
+			for (const [name, value] of attributes) if (node.getAttribute(name) !== value) node.setAttribute(name, value);
+			for (const [text, value] of item.text) text.data = value;
+		}
+		for (const item of snapshot.nodes) {
+			const { node } = item;
+			if (item.value !== undefined && node.tagName !== "SELECT") node.value = item.value;
+			for (const key of ["checked", "indeterminate", "selected"]) if (item[key] !== undefined) node[key] = item[key];
+			if (item.files !== undefined) {
+				const transfer = new this.document.defaultView.DataTransfer();
+				for (const file of item.files) transfer.items.add(file);
+				node.files = transfer.files;
+			}
+			if (item.selectionStart != null && typeof node.setSelectionRange === "function") node.setSelectionRange(item.selectionStart, item.selectionEnd, item.selectionDirection);
+			node.scrollTop = item.scrollTop;
+			node.scrollLeft = item.scrollLeft;
+		}
+		panel.returnValue = snapshot.returnValue;
+	}
+
+	unpaint() {
+		for (const [node, value] of this.inert) node.inert = value;
+		this.inert.clear();
+		for (const [panel, styles] of this.styles) for (const [name, [value, priority]] of styles) {
+			if (value) panel.style.setProperty(name, value, priority);
+			else panel.style.removeProperty(name);
+		}
+		this.styles.clear();
+	}
+
+	paint() {
+		this.unpaint();
+		const stack = this.current()?.stack || [];
+		const top = stack.at(-1);
+		this.backdrop.hidden = !top;
+		if (!top) return;
+		const inset = Math.max(0, this.titlebar?.getBoundingClientRect().bottom || 0);
+		this.backdrop.style.top = `${inset}px`;
+		this.backdrop.style.zIndex = String(1000 + (stack.length - 1) * 2);
+		const disable = node => {
+			if (!node || node === this.titlebar || node === this.backdrop || this.records.has(node)) return;
+			if (node.contains(this.titlebar) || [...this.records.keys()].some(panel => node.contains(panel))) {
+				for (const child of node.children) disable(child);
+				return;
+			}
+			if (!this.inert.has(node)) this.inert.set(node, node.inert);
+			node.inert = true;
+		};
+		for (const target of typeof this.targets === "function" ? this.targets() : this.targets) disable(target);
+		for (const [index, panel] of stack.entries()) {
+			if (panel !== top) { this.inert.set(panel, panel.inert); panel.inert = true; }
+			const values = { position: "fixed", inset: `${inset}px 0 0`, zIndex: String(1001 + index * 2), maxHeight: `calc(100dvh - ${inset + 24}px)`, "--dialog-inset": `${inset}px` };
+			const styles = new Map();
+			for (const [key, value] of Object.entries(values)) {
+				const name = key.replace(/[A-Z]/g, letter => `-${letter.toLowerCase()}`);
+				styles.set(name, [panel.style.getPropertyValue(name), panel.style.getPropertyPriority(name)]);
+				panel.style.setProperty(name, value);
+			}
+			this.styles.set(panel, styles);
+		}
+	}
+
+	focus(restore = false) {
+		const panel = this.current()?.stack.at(-1);
+		if (!panel || this.applicationOpen()) return;
+		const saved = restore ? this.current().entries.get(panel)?.snapshot?.focus || this.current().entries.get(panel)?.focus : null;
+		const target = saved?.isConnected && panel.contains(saved) ? saved : panel.querySelector("[autofocus], button:not(:disabled), input:not(:disabled), select:not(:disabled), textarea:not(:disabled), [tabindex]") || panel;
+		if (restore || !panel.contains(this.document.activeElement)) target.focus({ preventScroll: true });
+		const selection = restore && this.current().entries.get(panel)?.snapshot?.selection;
+		if (selection?.anchor?.isConnected && selection.focus?.isConnected) this.document.getSelection().setBaseAndExtent(selection.anchor, selection.start, selection.focus, selection.end);
+		if (restore) for (const item of this.current().entries.get(panel)?.snapshot?.nodes || []) { item.node.scrollTop = item.scrollTop; item.node.scrollLeft = item.scrollLeft; }
+	}
+}
+
+export function positionDropdown(list, anchor, fit = false) {
+	const rect = anchor.getBoundingClientRect(), viewport = window.visualViewport;
+	const left = viewport?.offsetLeft || 0, top = viewport?.offsetTop || 0;
+	const width = viewport?.width || window.innerWidth, height = viewport?.height || window.innerHeight;
+	if (rect.right <= left || rect.left >= left + width || rect.bottom <= top || rect.top >= top + height) return false;
+	const below = top + height - rect.bottom - 12, above = rect.top - top - 12;
+	const limit = Math.min(280, Math.max(below, above));
+	if (limit < 20) return false;
+	const minimum = Math.min(rect.width, width - 16);
+	Object.assign(list.style, { width: fit ? "max-content" : `${minimum}px`, minWidth: `${minimum}px`, maxWidth: `${width - 16}px`, maxHeight: `${limit}px` });
+	const size = list.getBoundingClientRect();
+	Object.assign(list.style, { left: `${Math.max(left + 8, Math.min(rect.left, left + width - size.width - 8))}px`,
+		top: `${below >= size.height || below >= above ? rect.bottom + 4 : rect.top - size.height - 4}px` });
+	return true;
+}
+
+export function bindDropdownPointer(list, choose) {
+	list.addEventListener("pointerdown", event => {
+		if (event.pointerType !== "touch" && event.target.closest("[data-index]")) event.preventDefault();
+	});
+	list.addEventListener("mousedown", event => { if (event.target.closest("[data-index]")) event.preventDefault(); });
+	list.addEventListener("click", event => {
+		const option = event.target.closest("[data-index]");
+		if (option) choose(Number(option.dataset.index));
+	});
+}
+
+export class SelectPicker {
+	constructor(onOpen) {
+		Object.assign(this, { onOpen, select: null, options: [], active: -1, selected: -1, query: "", queryTime: 0, frame: 0, touchClick: false });
+		this.list = document.createElement("div");
+		this.list.className = "dropdown-list";
+		this.list.setAttribute("popover", "manual");
+		bindDropdownPointer(this.list, index => this.choose(index));
+		window.addEventListener("pointerdown", event => {
+			if (event.button !== 0) return;
+			this.touchClick = false;
+			const select = event.target.closest("select");
+			if (select && !select.matches(":disabled")) event.preventDefault();
+			if (this.select && event.target !== this.select && !this.list.contains(event.target)) this.close();
+		}, true);
+		window.addEventListener("pointerup", event => {
+			const select = event.target.closest("select");
+			if (event.pointerType !== "touch" || !select || select.matches(":disabled")) return;
+			event.preventDefault();
+			if (this.select === select) this.close();
+			else this.show(select);
+			this.touchClick = true;
+		}, true);
+		window.addEventListener("mousedown", event => {
+			if (event.button === 0 && event.target.closest("select")) event.preventDefault();
+		}, true);
+		window.addEventListener("click", event => {
+			const select = event.target.closest("select");
+			if (!select || select.matches(":disabled")) return;
+			event.preventDefault();
+			if (this.touchClick) { this.touchClick = false; return; }
+			if (this.select === select) this.close();
+			else this.show(select);
+		}, true);
+		window.addEventListener("keydown", event => this.keyDown(event), true);
+		window.addEventListener("focusin", event => {
+			if (this.select && event.target !== this.select && !this.list.contains(event.target)) this.close();
+		});
+		window.addEventListener("scroll", event => {
+			if (this.select && !this.list.contains(event.target)) this.position();
+		}, true);
+		window.addEventListener("resize", () => this.close());
+		window.addEventListener("blur", () => this.close());
+		window.addEventListener("pagehide", () => this.close());
+		document.addEventListener("close", event => {
+			if (this.select && event.target.contains(this.select)) this.close();
+		}, true);
+		document.addEventListener("reset", event => {
+			if (this.select?.form === event.target) this.close();
+		}, true);
+		document.addEventListener("change", event => {
+			if (event.target === this.select) this.render();
+		}, true);
+	}
+
+	show(select) {
+		this.close();
+		this.onOpen?.();
+		select.focus({ preventScroll: true });
+		if (!select.isConnected || select.matches(":disabled")) return;
+		this.select = select;
+		(select.closest("dialog") || document.body).append(this.list);
+		this.render();
+		if (!this.select) return;
+		this.list.showPopover();
+		this.position();
+		if (!this.select) return;
+		this.activate(this.active);
+		this.observer = new MutationObserver(() => this.render());
+		this.observer.observe(select, { subtree: true, childList: true, characterData: true, attributes: true });
+		this.watch();
+	}
+
+	render() {
+		const select = this.select;
+		if (!select) return;
+		const previous = this.options[this.active]?.option, changed = this.selected !== select.selectedIndex;
+		this.selected = select.selectedIndex;
+		this.options = [...select.options].filter(option => !option.hidden && !option.parentElement.hidden).map(option => ({
+			option, disabled: option.disabled || option.parentElement.tagName === "OPTGROUP" && option.parentElement.disabled,
+		}));
+		if (!this.options.length) { this.close(); return; }
+		this.list.replaceChildren();
+		let group = null;
+		for (const [index, { option, disabled }] of this.options.entries()) {
+			if (option.parentElement.tagName === "OPTGROUP" && group !== option.parentElement) {
+				group = option.parentElement;
+				const heading = document.createElement("div");
+				heading.className = "dropdown-group";
+				heading.textContent = group.label;
+				this.list.append(heading);
+			}
+			const row = document.createElement("div");
+			row.className = "dropdown-option";
+			row.dataset.index = String(index);
+			row.dataset.disabled = String(disabled);
+			const label = document.createElement("span");
+			label.textContent = option.label;
+			row.append(label);
+			row.title = option.title;
+			this.list.append(row);
+		}
+		const selected = this.options.findIndex(({ option, disabled }) => !disabled && option === (changed ? select.selectedOptions[0] : previous));
+		this.activate(selected < 0 ? this.options.findIndex(({ disabled }) => !disabled) : selected);
+		if (this.list.matches(":popover-open")) this.position();
+	}
+
+	watch() {
+		const select = this.select;
+		if (!select) return;
+		if (!select.isConnected || select.matches(":disabled") || !select.getClientRects().length || select.closest("[hidden], [inert], dialog:not([open])")) {
+			this.close();
+			return;
+		}
+		if (this.selected !== select.selectedIndex) this.render();
+		if (this.select) this.frame = requestAnimationFrame(() => this.watch());
+	}
+
+	position() {
+		if (this.select && !positionDropdown(this.list, this.select, true)) this.close();
+	}
+
+	activate(index) {
+		this.active = index;
+		for (const row of this.list.querySelectorAll(".dropdown-option")) {
+			row.dataset.selected = String(Number(row.dataset.index) === index);
+			if (row.dataset.selected === "true" && this.list.matches(":popover-open")) row.scrollIntoView({ block: "nearest" });
+		}
+	}
+
+	choose(index) {
+		const select = this.select, item = this.options[index];
+		if (!select || select.matches(":disabled") || !item || item.disabled || !select.contains(item.option)) return;
+		const changed = select.selectedIndex !== item.option.index;
+		select.selectedIndex = item.option.index;
+		this.close();
+		if (changed) {
+			select.dispatchEvent(new Event("input", { bubbles: true }));
+			select.dispatchEvent(new Event("change", { bubbles: true }));
+		}
+	}
+
+	close() {
+		if (!this.select) return;
+		this.observer?.disconnect();
+		this.observer = null;
+		cancelAnimationFrame(this.frame);
+		this.frame = 0;
+		this.list.hidePopover();
+		this.list.remove();
+		this.list.replaceChildren();
+		this.select = null;
+		this.options = [];
+		this.active = this.selected = -1;
+		this.query = "";
+		this.queryTime = 0;
+	}
+
+	keyDown(event) {
+		if (event.defaultPrevented || event.isComposing) return;
+		this.touchClick = false;
+		if (event.ctrlKey || event.metaKey || event.key === "Tab") { this.close(); return; }
+		const select = event.target.closest("select");
+		if (!select || select.matches(":disabled") || event.altKey && !["ArrowDown", "ArrowUp"].includes(event.key)) return;
+		const key = event.key, open = this.select === select;
+		if (key === "Escape") {
+			if (!open) return;
+			this.close();
+		} else if (key === "F4" || event.altKey) {
+			if (open) this.close();
+			else this.show(select);
+		} else if (["Enter", " "].includes(key)) {
+			if (open) this.choose(this.active);
+			else this.show(select);
+		} else if (["ArrowDown", "ArrowUp", "Home", "End", "PageDown", "PageUp"].includes(key)) {
+			if (!open) this.show(select);
+			if (this.select && (open || !["ArrowDown", "ArrowUp"].includes(key))) {
+				const available = this.options.flatMap(({ disabled }, index) => disabled ? [] : [index]);
+				const at = available.indexOf(this.active), direction = ["ArrowUp", "PageUp"].includes(key) ? -1 : 1;
+				const step = key.startsWith("Page") ? Math.max(1, Math.floor(this.list.clientHeight / (this.list.querySelector(".dropdown-option")?.offsetHeight || 32)) - 1) : 1;
+				const next = key === "Home" ? 0 : key === "End" ? available.length - 1 : Math.max(0, Math.min(available.length - 1, at + direction * step));
+				this.activate(available[next] ?? -1);
+			}
+		} else if (key.length === 1) {
+			if (!open) this.show(select);
+			const now = performance.now();
+			this.query = (now - this.queryTime < 700 ? this.query : "") + key.toLocaleLowerCase();
+			this.queryTime = now;
+			const repeated = [...this.query].every(value => value === this.query[0]), query = repeated ? this.query[0] : this.query;
+			const start = repeated ? this.active + 1 : Math.max(0, this.active);
+			for (let offset = 0; offset < this.options.length; offset++) {
+				const index = (start + offset) % this.options.length, item = this.options[index];
+				if (!item.disabled && item.option.label.trim().toLocaleLowerCase().startsWith(query)) { this.activate(index); break; }
+			}
+		} else return;
+		event.preventDefault();
+		event.stopImmediatePropagation();
+	}
+}

assets/webui/ofdgo_wasm.js

@@ -1,11 +1,15 @@
 importScripts("./wasm_exec.js");
 
-let pending = Promise.resolve();
+const engines = new Map();
-const operations = new Map();
+let resolveRuntime;
-const fontRequests = new Map();
+let rejectRuntime;
+const runtimeReady = new Promise((resolve, reject) => { resolveRuntime = resolve; rejectRuntime = reject; });
+runtimeReady.catch(() => {});
 let fontSequence = 0;
+let engineMemory = null;
 
-function requestFont(id, signal, name, done) {
+function requestFont(engine, id, signal, name, done) {
+	const fontRequests = engine.fontRequests;
 	if (signal.aborted) { done(null, "", true); return; }
 	const request = ++fontSequence;
 	const cancel = () => {
@@ -17,23 +21,79 @@ function requestFont(id, signal, name, done) {
 		signal.removeEventListener("abort", cancel);
 		done(result.bytes, result.error || "", signal.aborted);
 	});
-	self.postMessage({ id, type: "font", request, name });
+	self.postMessage({ engineID: engine.id, id, type: "font", request, name });
 }
 self.onmessage = ({ data }) => {
+	if (data.type === "module") {
+		if (data.error) exitWASM(new Error(data.error));
+		else loadWASM(data.module).catch(exitWASM);
+		return;
+	}
+	const engineID = data.engineID;
+	if (typeof engineID !== "string" || !engineID) {
+		self.postMessage({ engineID, id: data.id, ok: false, error: "missing engine ID" });
+		return;
+	}
+	if (data.type === "open") {
+		if (engines.has(engineID)) {
+			self.postMessage({ engineID, type: "exit", error: "engine already exists" });
+			return;
+		}
+		const engine = { id: engineID, operations: new Map(), fontRequests: new Map(), active: new Set(), closed: false };
+		engines.set(engineID, engine);
+		engine.pending = runtimeReady.then(async () => {
+			if (engine.closed) return;
+			const opened = JSON.parse(globalThis.ofdgoEngineOpen(engineID));
+			if (!opened.ok) throw new Error(opened.error);
+			const backends = JSON.parse(await globalThis.ofdgoEngineCall(engineID, "ofdgoRenderBackends", null));
+			if (!backends.ok) throw new Error(backends.error);
+			if (!engine.closed) self.postMessage({ engineID, type: "ready", backends: backends.data, memory: engineMemory.buffer.byteLength });
+		}).catch(error => {
+			engine.closed = true;
+			self.postMessage({ engineID, type: "exit", error: error.message });
+		});
+		return;
+	}
+	const engine = engines.get(engineID);
+	if (!engine && data.type === "close") {
+		self.postMessage({ engineID, type: "closed" });
+		return;
+	}
+	if (!engine || engine.closed && data.type !== "close") {
+		self.postMessage({ engineID, id: data.id, ok: false, error: "unknown or closed engine" });
+		return;
+	}
+	if (data.type === "close") {
+		engine.closed = true;
+		for (const operation of engine.operations.values()) operation.abort();
+		engine.pending.then(async () => {
+			await Promise.all([...engine.active]);
+			await runtimeReady;
+			globalThis.ofdgoEngineClose(engineID);
+			engines.delete(engineID);
+			self.postMessage({ engineID, type: "closed" });
+		}).catch(() => engines.delete(engineID));
+		return;
+	}
 	if (data.type === "font") {
-		fontRequests.get(data.request)?.(data);
+		engine.fontRequests.get(data.request)?.(data);
-		fontRequests.delete(data.request);
+		engine.fontRequests.delete(data.request);
 		return;
 	}
 	if (data.type === "cancel") {
-		operations.get(data.id)?.abort();
+		engine.operations.get(data.id)?.abort();
 		return;
 	}
-	if (data.name === "ofdgoResources") operations.set(data.id, new AbortController());
+	engine.operations.set(data.id, new AbortController());
-	if (data.name === "ofdgoImportImages" || data.name === "ofdgoExportImages" || data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" || data.name === "ofdgoConvertPDF" || data.name === "ofdgoExportPage" || data.name === "ofdgoExportDocument" || data.name === "ofdgoExportAttachment" || data.name === "ofdgoExportResource" || data.name === "ofdgoExportMedia" || data.name === "ofdgoExportVersion" || data.name === "ofdgoSaveDocument" || data.name === "ofdgoSaveSigned" || data.name === "ofdgoImportPages") {
+	engine.pending = engine.pending.then(() => {
-		operations.set(data.id, new AbortController());
+		const operation = (data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" ? handleBatchMessage(engine, data) : handleMessage(engine, data)).catch(error => {
-	}
+			engine.operations.delete(data.id);
-	pending = pending.then(() => data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" ? handleBatchMessage(data) : handleMessage(data));
+			self.postMessage({ engineID, id: data.id, ok: false, error: error.message });
+		});
+		engine.active.add(operation);
+		operation.finally(() => engine.active.delete(operation));
+		if (data.name !== "ofdgoSaveSnapshot") return operation;
+	});
 };
 
 async function availableOutput(directory, base, format) {
@@ -49,7 +109,9 @@ async function availableOutput(directory, base, format) {
 	}
 }
 
-async function handleBatchMessage({ id, name, args }) {
+async function handleBatchMessage(engine, { id, name, args }) {
+	const operations = engine.operations;
+	const postMessage = (data, transfer) => self.postMessage({ ...data, engineID: engine.id }, transfer);
 	const signal = operations.get(id).signal;
 	const channel = new MessageChannel();
 	const finish = (done, err) => {
@@ -79,17 +141,20 @@ async function handleBatchMessage({ id, name, args }) {
 		if (name === "ofdgoConvertFile") {
 			const [file, options, fonts, destination] = args;
 			credentials = options.credentials;
-			const formats = JSON.parse(globalThis.ofdgoOutputFormats()).data;
+			const formats = JSON.parse(await globalThis.ofdgoEngineCall(engine.id, "ofdgoOutputFormats", null)).data;
 			const format = formats.find(item => item.value === options.format);
 			if (!format) throw new Error("不支持此格式");
 			root = destination;
 			const base = options.base.replace(/[<>:"/\\|?*\x00-\x1f]/g, "_").replace(/[. ]+$/g, "") || "document";
-			const target = root ? await availableOutput(root, base, format) : { stem: base, name: format.paged ? base : `${base}.${format.extension}` };
+			const target = root ? await navigator.locks.request("ofdgo-convert-output", { signal }, async () => {
-			if (root && format.paged) {
+				signal.throwIfAborted();
-				directory = await root.getDirectoryHandle(target.name, { create: true });
+				const target = await availableOutput(root, base, format);
+				if (format.paged) directory = await root.getDirectoryHandle(target.name, { create: true });
+				else { await root.getFileHandle(target.name, { create: true }); directory = root; }
 				created = target.name;
-				self.postMessage({ id, type: "output", name: created });
+				postMessage({ id, type: "output", name: created });
-			} else directory = root;
+				return target;
+			}) : { stem: base, name: format.paged ? base : `${base}.${format.extension}` };
 			const boundary = async (action, pageName) => {
 				signal.throwIfAborted();
 				if (action === "open") {
@@ -100,7 +165,7 @@ async function handleBatchMessage({ id, name, args }) {
 						const handle = await directory.getFileHandle(fileName, { create: true });
 						if (!format.paged) {
 							created = fileName;
-							self.postMessage({ id, type: "output", name: created });
+							postMessage({ id, type: "output", name: created });
 						}
 						current.handle = handle;
 						output = await handle.createWritable();
@@ -113,19 +178,19 @@ async function handleBatchMessage({ id, name, args }) {
 					chunks = [];
 				}
 			};
-			payload = await globalThis.ofdgoConvertFile(read(file), file.size, options, write,
+			payload = await globalThis.ofdgoEngineCall(engine.id, "ofdgoConvertFile", done => finish(done), read(file), file.size, options, write,
 				(phase, completed, total, done) => {
-					self.postMessage({ id, type: "conversion", phase, completed, total });
+					postMessage({ id, type: "conversion", phase, completed, total, memory: engineMemory.buffer.byteLength });
 					finish(done);
 				},
 				(action, pageName, done) => boundary(action, pageName).then(() => finish(done), err => finish(done, err)),
-				done => finish(done), fonts, (name, done) => requestFont(id, signal, name, done));
+				done => finish(done), fonts, (name, done) => requestFont(engine, id, signal, name, done));
 		} else {
 			const [entries, handle, compression] = args;
 			if (handle) output = await handle.createWritable();
-			payload = await globalThis.ofdgoPackFiles(entries.map(entry => ({ name: entry.name, size: entry.file.size })),
+			payload = await globalThis.ofdgoEngineCall(engine.id, "ofdgoPackFiles", done => finish(done), entries.map(entry => ({ name: entry.name, size: entry.file.size })),
 				index => read(entries[index].file), write,
-				(completed, total, done) => { self.postMessage({ id, type: "conversion", phase: "pack", completed, total }); finish(done); },
+				(completed, total, done) => { postMessage({ id, type: "conversion", phase: "pack", completed, total, memory: engineMemory.buffer.byteLength }); finish(done); },
 				done => finish(done), compression);
 		}
 		signal.throwIfAborted();
@@ -144,7 +209,7 @@ async function handleBatchMessage({ id, name, args }) {
 		}
 		result.data.size = size;
 		operations.delete(id);
-		self.postMessage({ id, ...result });
+		postMessage({ id, ...result, memory: engineMemory.buffer.byteLength });
 	} catch (err) {
 		await output?.abort().catch(() => {});
 		let message = signal.aborted ? "转换已取消" : err.message;
@@ -152,7 +217,7 @@ async function handleBatchMessage({ id, name, args }) {
 			try { await root.removeEntry(created, { recursive: true }); }
 			catch (cleanupError) { message += `；清理失败：${cleanupError.message}`; }
 		}
-		self.postMessage({ id, ok: false, error: message, code: err.code, canceled: signal.aborted });
+		postMessage({ id, ok: false, error: message, code: err.code, canceled: signal.aborted, memory: engineMemory.buffer.byteLength });
 	} finally {
 		credentials?.password?.fill(0);
 		credentials?.key?.fill(0);
@@ -162,19 +227,32 @@ async function handleBatchMessage({ id, name, args }) {
 		operations.delete(id);
 	}
 }
-async function handleMessage({ id, name, args }) {
+async function handleMessage(engine, { id, name, args }) {
+	const operations = engine.operations;
+	const postMessage = (data, transfer) => self.postMessage({ ...data, engineID: engine.id }, transfer);
 	let output;
+	let saveFile;
+	let saveStamp;
 	let channel;
 	const signal = operations.get(id)?.signal;
-	const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages";
+	const cancellable = ["ofdgoPreparePrint", "ofdgoLayoutPrint", "ofdgoPrintSide", "ofdgoPrintPDF", "ofdgoResources", "ofdgoPrepareSave", "ofdgoSaveSnapshot", "ofdgoImportDocuments", "ofdgoImportImages", "ofdgoExportImages", "ofdgoOpenPDF", "ofdgoExportPage", "ofdgoExportDocument", "ofdgoExportAttachment", "ofdgoExportResource", "ofdgoExportMedia", "ofdgoExportVersion", "ofdgoSaveDocument", "ofdgoSaveSigned", "ofdgoImportPages"].includes(name);
-	const converting = name === "ofdgoConvertPDF";
+	const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages" || name === "ofdgoImportDocuments";
-	const saving = name === "ofdgoSaveDocument" || name === "ofdgoSaveSigned";
+	const converting = name === "ofdgoOpenPDF";
-	const resources = name === "ofdgoResources";
+	const saving = name === "ofdgoSaveDocument" || name === "ofdgoSaveSnapshot" || name === "ofdgoSaveSigned";
+	const resources = ["ofdgoPreparePrint", "ofdgoLayoutPrint", "ofdgoPrintSide", "ofdgoPrintPDF", "ofdgoResources", "ofdgoPrepareSave"].includes(name);
+	if (engine.pdf) {
+		const checked = JSON.parse(await globalThis.ofdgoEngineCall(engine.id, "ofdgoCheckDocument", null, name));
+		if (!checked.ok) { postMessage({id, ...checked}); operations.delete(id); return; }
+	}
 	const key = name === "ofdgoOpen" ? args[3]?.key : name === "ofdgoSaveSigned" || name === "ofdgoLoadImport" ? args[1]?.key : null;
 	const keyPassword = name === "ofdgoOpen" ? args[3]?.keyPassword : name === "ofdgoSaveSigned" || name === "ofdgoLoadImport" ? args[1]?.keyPassword : null;
 	const password = converting ? args[2] : name === "ofdgoSetEncryption" ? args[0]?.password : name === "ofdgoOpen" ? args[3]?.password : name === "ofdgoLoadImport" ? args[1]?.password : null;
 	try {
 		signal?.throwIfAborted();
+		if (["ofdgoOpen", "ofdgoOpenPDF", "ofdgoLoadImport"].includes(name) && args[0] instanceof Blob) {
+			const file = args[0], reader = new FileReaderSync();
+			args[0] = {size: file.size, read: (offset, size) => new Uint8Array(reader.readAsArrayBuffer(file.slice(offset, offset + size)))};
+		}
 		if (name === "ofdgoDetectFormat") {
 			const file = args[0], reader = new FileReaderSync();
 			channel = new MessageChannel();
@@ -203,7 +281,7 @@ async function handleMessage({ id, name, args }) {
 		}
 		const chunks = [];
 		let size = 0;
-		if (signal) {
+		if (cancellable) {
 			channel = new MessageChannel();
 			const finish = (done, err, commit = false) => {
 				channel.port1.onmessage = () => {
@@ -216,12 +294,15 @@ async function handleMessage({ id, name, args }) {
 				args.push(done => finish(done));
 			} else if (importing || converting) {
 				args.push((phase, completed, total, done) => {
-					self.postMessage({ id, type: importing ? "import" : "conversion", phase, completed, total });
+					postMessage({ id, type: importing ? "import" : "conversion", phase, completed, total });
 					finish(done, null, importing && phase === "commit");
 				});
-				if (converting) args.push((name, done) => requestFont(id, signal, name, done));
+				if (converting) args.push((name, done) => requestFont(engine, id, signal, name, done));
 			} else {
-				const file = args.pop();
+				const destination = args.pop();
+				const file = destination?.fileHandle || destination;
+				saveFile = file;
+				saveStamp = destination?.saveStamp;
 				const compression = saving && name !== "ofdgoSaveSigned" && args.at(-1)?.mode !== undefined ? args.pop() : null;
 				const indices = saving ? args.shift() : null;
 				if (file) output = await file.createWritable();
@@ -241,33 +322,55 @@ async function handleMessage({ id, name, args }) {
 				});
 				if (name === "ofdgoExportDocument") {
 					args.push((completed, total, done) => {
-						self.postMessage({ id, type: "export", stage: "pages", completed, total });
+						postMessage({ id, type: "export", stage: "pages", completed, total });
 						finish(done);
 					});
 				} else if (name === "ofdgoExportVersion") {
 					args.push((phase, completed, total, done) => {
-						self.postMessage({ id, type: "export", stage: "prepare", phase, completed, total });
+						postMessage({ id, type: "export", stage: "prepare", phase, completed, total });
 						finish(done);
 					}, done => finish(done));
 				} else if (saving) {
 					args.push((phase, completed, total, done) => {
-						self.postMessage({ id, type: "export", stage: "prepare", phase, completed, total });
+						postMessage({ id, type: "export", stage: "prepare", phase, completed, total });
 						finish(done);
 					});
-					if (compression) args.push(indices, compression, done => finish(done));
+					if (compression || name === "ofdgoSaveSnapshot") args.push(indices, compression || {mode: 0}, done => finish(done));
 					else if (indices != null) args.push(indices);
 				}
 				if (!saving && args.some(value => value?.mode !== undefined)) args.push(done => finish(done));
 			}
 		}
-		const payload = await globalThis[name](...args);
+		if (engine.pdf && name !== "ofdgoOpenPDF") {
+			channel ||= new MessageChannel();
+			const context = await globalThis.ofdgoEngineCall(engine.id, "ofdgoPDFContext", null, (phase, completed, total, done) => {
+				postMessage({id, type: "conversion", phase, completed, total});
+				channel.port1.onmessage = () => done("", signal.aborted);
+				channel.port2.postMessage(null);
+			}, (name, done) => requestFont(engine, id, signal, name, done));
+			engine.pdf = JSON.parse(context).data === true;
+		}
+		const started = name === "ofdgoOpen" || name === "ofdgoRenderPage" ? performance.now() : null;
+		const payload = await globalThis.ofdgoEngineCall(engine.id, name, done => {
+			channel ||= new MessageChannel();
+			channel.port1.onmessage = () => done("", signal.aborted);
+			channel.port2.postMessage(null);
+		}, ...args);
 		signal?.throwIfAborted();
 		const result = typeof payload === "string" ? JSON.parse(payload) : payload;
-		if (signal && !importing && !converting && !resources && result.ok) {
+		if (result.ok && name === "ofdgoOpenPDF") engine.pdf = true;
-			operations.delete(id);
+		if (result.ok && (name === "ofdgoOpen" || name === "ofdgoLoadPDF" && result.data.done)) engine.pdf = false;
+		if (started !== null && result.ok) result.elapsed = performance.now() - started;
+		if (cancellable && !importing && !converting && !resources && result.ok) {
 			result.data.size = size;
-			if (name !== "ofdgoExportMedia") self.postMessage({ id, type: "export", stage: "save" });
+			if (name !== "ofdgoExportMedia") postMessage({ id, type: "export", stage: "save" });
 			if (output) {
+				if (saveStamp) {
+					const current = await saveFile.getFile();
+					if (current.size !== saveStamp.size || current.lastModified !== saveStamp.modified) throw new Error("文件已被修改，请另存");
+				}
+				signal.throwIfAborted();
+				operations.delete(id);
 				await output.close();
 			} else {
 				result.data.blob = new Blob(chunks, { type: result.data.mime });
@@ -276,16 +379,16 @@ async function handleMessage({ id, name, args }) {
 			await output.abort();
 		}
 		output = null;
-		const transfer = result.data?.bytes ? [result.data.bytes.buffer] : (result.data?.images || []).map((image) => image.bytes.buffer);
+		const transfer = [...new Set([result.data?.bytes, ...(result.data?.images || []).map(image => image.bytes), ...(result.data?.fonts || []).map(font => font.data)].filter(bytes => bytes?.byteLength).map(bytes => bytes.buffer))];
-		self.postMessage({ id, ...result }, transfer);
+		postMessage({ id, ...result, memory: engineMemory.buffer.byteLength }, transfer);
 	} catch (err) {
 		await output?.abort().catch(() => {});
-		const result = { id, ok: false, error: err.message };
+		const result = { id, ok: false, error: err.message, errorName: err.name };
 		if (signal?.aborted) {
-			result.error = resources ? "查询已取消" : importing ? "导入已取消" : converting ? "转换已取消" : "导出已取消";
+			result.error = resources ? "查询已取消" : importing ? "导入已取消" : converting ? "转换已取消" : cancellable ? "导出已取消" : "操作已取消";
 			result.canceled = true;
 		}
-		self.postMessage(result);
+		postMessage(result);
 	} finally {
 		password?.fill(0);
 		key?.fill(0);
@@ -297,23 +400,20 @@ async function handleMessage({ id, name, args }) {
 }
 
 function exitWASM(err) {
+	rejectRuntime(err || new Error("引擎运行中断"));
 	self.postMessage({ type: "exit", error: err?.message || "引擎运行中断" });
 	self.close();
 }
 
-async function loadWASM() {
+async function loadWASM(module) {
 	const go = new Go();
-	self.postMessage({ type: "progress", phase: "download", text: "正在下载引擎", percent: 16 });
+	const instance = await WebAssembly.instantiate(module, go.importObject);
-	const response = await fetch("./ofdgo.wasm");
+	engineMemory = instance.exports.mem;
-	self.postMessage({ type: "progress", phase: "compile", text: "正在编译引擎", percent: 35 });
-	const { instance } = await WebAssembly.instantiateStreaming(response, go.importObject);
 	self.postMessage({ type: "progress", phase: "start", text: "正在启动引擎", percent: 58 });
 	go.run(instance).then(exitWASM, exitWASM);
 	if (!go.exited) {
-		const backends = JSON.parse(globalThis.ofdgoRenderBackends());
+		resolveRuntime();
-		if (!backends.ok) throw new Error(backends.error);
-		self.postMessage({ type: "ready", backends: backends.data });
 	}
 }
 
-loadWASM().catch(exitWASM);
+self.postMessage({ type: "module" });

assets/webui/ofdgo_work.js

@@ -1,6 +1,6 @@
 const CACHE_PREFIX = `ofdgo:${self.registration.scope}:app:`;
 const META_CACHE = `${CACHE_PREFIX}meta`;
-const ASSETS = ["./", "ofdgo.css", "ofdgo.js", "ofdgo.json", "ofdgo.svg", "ofdgo.wasm", "ofdgo_edit.js", "ofdgo_font.js", "ofdgo_wasm.js", "ofdgo_work.js", "wasm_exec.js"]
+const ASSETS = ["./", "ofdgo.css", "ofdgo.ico", "ofdgo.js", "ofdgo.json", "ofdgo.png", "ofdgo.svg", "ofdgo.wasm", "ofdgo_edit.js", "ofdgo_font.js", "ofdgo_host.js", "ofdgo_print.js", "ofdgo_theme.js", "ofdgo_util.js", "ofdgo_view.js", "ofdgo_wasm.js", "ofdgo_work.js", "wasm_exec.js"]
 	.map((path) => new URL(path, self.registration.scope).href);
 const CLIENT_PREFIX = new URL("__client/", self.registration.scope).href;
 
@@ -92,6 +92,8 @@ async function readResource(event, navigation) {
 		bundle = await readBundle(meta, CLIENT_PREFIX + event.clientId);
 	}
 	if (!bundle || !await caches.has(bundle.name)) {
+		const client = await self.clients.get(event.clientId);
+		if (client && resourceURL(client.url) !== self.registration.scope) return fetch(event.request);
 		return Response.error();
 	}
 	if (event.resultingClientId) {
@@ -106,8 +108,9 @@ async function readResource(event, navigation) {
 }
 
 async function updateBundle(meta) {
+	const signal = AbortSignal.timeout(120000);
 	const resources = await Promise.all(ASSETS.map(async (url) => {
-		const response = await fetch(new Request(url, { cache: "no-store" }));
+		const response = await fetch(new Request(url, { cache: "no-store", signal }));
 		if (!response.ok || response.redirected) {
 			throw new Error("资源下载失败");
 		}

assets/webui/wasm/assets.go

@@ -0,0 +1,22 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package wasmassets
+
+import "embed"
+
+// FS WebUI嵌入WASM引擎
+//
+//go:embed ofdgo.wasm
+var FS embed.FS

build.bat

@@ -0,0 +1,18 @@
+setlocal
+set Version=
+for /f %%V in ('git show -s --format^=%%ct-%%H HEAD') do set Version=%%V
+
+set GOOS=linux
+set GOARCH=arm64
+set CGO_ENABLED=0
+go build -o releases/ofdgo_linux_arm64 -trimpath -ldflags "-s -w -buildid= -X github.com/xiaoqidun/ofdgo/internal/build.Version=%Version%" ./cmd/webview
+
+set GOOS=linux
+set GOARCH=amd64
+set CGO_ENABLED=0
+go build -o releases/ofdgo_linux_amd64 -trimpath -ldflags "-s -w -buildid= -X github.com/xiaoqidun/ofdgo/internal/build.Version=%Version%" ./cmd/webview
+
+set GOOS=windows
+set GOARCH=amd64
+set CGO_ENABLED=0
+go build -o releases/ofdgo_windows_amd64.exe -trimpath -ldflags "-H windowsgui -s -w -buildid= -X github.com/xiaoqidun/ofdgo/internal/build.Version=%Version%" ./cmd/webview

cmd/webui/webui.go

@@ -18,6 +18,9 @@ package main
 
 import (
 	"bytes"
+	"crypto/sha256"
+	"embed"
+	"encoding/hex"
 	"flag"
 	"fmt"
 	"net/http"
@@ -25,6 +28,8 @@ import (
 	"time"
 
 	"github.com/xiaoqidun/ofdgo/assets/webui"
+	"github.com/xiaoqidun/ofdgo/assets/webui/wasm"
+	"github.com/xiaoqidun/ofdgo/internal/build"
 )
 
 func main() {
@@ -39,12 +44,18 @@ func main() {
 // 返回: http.Handler HTTP处理器
 func serveWebUI() http.Handler {
 	files := http.FileServerFS(webuiassets.FS)
-	checksum := webuiassets.Checksum()
+	wasm := http.FileServerFS(wasmassets.FS)
+	checksum := resourceChecksum()
 	serviceWorker, _ := webuiassets.FS.ReadFile("ofdgo_work.js")
 	serviceWorker = append([]byte(fmt.Sprintf("const BUNDLE_CHECKSUM = %q;\n", checksum)), serviceWorker...)
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Cache-Control", "no-store")
 		w.Header().Set("X-OFDGo-Checksum", checksum)
+		w.Header().Set("X-OFDGo-Build-Version", build.Version)
+		if r.URL.Path == "/ofdgo.wasm" {
+			wasm.ServeHTTP(w, r)
+			return
+		}
 		if r.URL.Path == "/ofdgo_work.js" {
 			http.ServeContent(w, r, "ofdgo_work.js", time.Time{}, bytes.NewReader(serviceWorker))
 			return
@@ -52,3 +63,17 @@ func serveWebUI() http.Handler {
 		files.ServeHTTP(w, r)
 	})
 }
+
+// resourceChecksum 计算WebUI界面与WASM引擎的资源校验值
+// 返回: string SHA-256十六进制校验值
+func resourceChecksum() string {
+	hash := sha256.New()
+	for _, resources := range []embed.FS{webuiassets.FS, wasmassets.FS} {
+		entries, _ := resources.ReadDir(".")
+		for _, entry := range entries {
+			data, _ := resources.ReadFile(entry.Name())
+			hash.Write(data)
+		}
+	}
+	return hex.EncodeToString(hash.Sum(nil))
+}

cmd/webview/webview.go

@@ -0,0 +1,59 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build (windows && amd64) || (linux && (amd64 || arm64))
+
+package main
+
+import (
+	"os"
+	"strings"
+)
+
+// commandLine 读取桌面参数并处理参数错误
+// 返回: []string 文件路径, string 浏览器数据目录
+func commandLine() ([]string, string) {
+	paths, dataDir, ok := parseArguments(os.Args[1:])
+	if !ok {
+		os.Exit(2)
+	}
+	return paths, dataDir
+}
+
+// parseArguments 解析双横线选项及后续文件路径
+// 入参: args 启动参数
+// 返回: []string 文件路径, string 浏览器数据目录, bool 参数是否有效
+func parseArguments(args []string) ([]string, string, bool) {
+	var dataDir string
+	for len(args) > 0 {
+		arg := args[0]
+		switch {
+		case arg == "--":
+			return args[1:], dataDir, true
+		case arg == "--data-dir":
+			if len(args) < 2 || strings.HasPrefix(args[1], "-") {
+				return nil, dataDir, false
+			}
+			dataDir, args = args[1], args[1:]
+		case strings.HasPrefix(arg, "--data-dir="):
+			dataDir = strings.TrimPrefix(arg, "--data-dir=")
+		case strings.HasPrefix(arg, "-"):
+			return nil, dataDir, false
+		default:
+			return args, dataDir, true
+		}
+		args = args[1:]
+	}
+	return nil, dataDir, true
+}

cmd/webview/webview_linux.go

@@ -0,0 +1,33 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build linux && (amd64 || arm64)
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/xiaoqidun/ofdgo/internal/webview"
+)
+
+func main() {
+	paths, dataDir := commandLine()
+	if err := webview.Run(context.Background(), paths, dataDir); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}

cmd/webview/webview_unsupported.go

@@ -0,0 +1,27 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !(windows && amd64) && !(linux && (amd64 || arm64))
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	fmt.Fprintln(os.Stderr, "OFDGo WebView Unsupported")
+	os.Exit(1)
+}

cmd/webview/webview_windows.go

@@ -0,0 +1,38 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build windows && amd64
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"syscall"
+	"unsafe"
+
+	"github.com/xiaoqidun/ofdgo/internal/webview"
+)
+
+func main() {
+	paths, dataDir := commandLine()
+	if err := webview.Run(context.Background(), paths, dataDir); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		message, _ := syscall.UTF16PtrFromString(err.Error())
+		title, _ := syscall.UTF16PtrFromString("OFDGo")
+		syscall.NewLazyDLL("user32.dll").NewProc("MessageBoxW").Call(0, uintptr(unsafe.Pointer(message)), uintptr(unsafe.Pointer(title)), 0x10)
+		os.Exit(1)
+	}
+}

go.mod

@@ -3,16 +3,18 @@ module github.com/xiaoqidun/ofdgo
 go 1.26.0
 
 require (
-	github.com/andybalholm/brotli v1.2.6
+	github.com/andybalholm/brotli v1.2.7
-	github.com/emmansun/gmsm v0.45.0
+	github.com/emmansun/gmsm v0.45.2
 	github.com/go-text/typesetting v0.3.5
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20261010204837-88a7f6b56918
-	github.com/xiaoqidun/j2kgo v1.0.1
+	github.com/xiaoqidun/guigo v0.0.0-20261030153939-c39abf593a0f
-	github.com/xiaoqidun/jbig2 v1.1.7
+	github.com/xiaoqidun/j2kgo v1.0.2
-	github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5
+	github.com/xiaoqidun/jbig2 v1.1.8
+	github.com/xiaoqidun/pdfgo v0.0.0-20261026125713-90454771d5d0
 	golang.org/x/crypto v0.58.0
 	golang.org/x/image v0.47.0
+	golang.org/x/sys v0.49.0
 	golang.org/x/text v0.43.0
 )
 
@@ -25,6 +27,7 @@ require (
 	github.com/ByteArena/poly2tri-go v0.0.0-20170716161910-d102ad91854f // indirect
 	github.com/benoitkugler/textlayout v0.3.2 // indirect
 	github.com/benoitkugler/textprocessing v0.0.6 // indirect
+	github.com/ebitengine/purego v0.11.2 // indirect
 	github.com/go-fonts/latin-modern v0.3.3 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
@@ -33,7 +36,6 @@ require (
 	github.com/tdewolff/parse/v2 v2.8.16 // indirect
 	github.com/yuin/goldmark v1.8.5 // indirect
 	golang.org/x/net v0.60.0 // indirect
-	golang.org/x/sys v0.49.0 // indirect
 	modernc.org/knuth v0.6.0 // indirect
 	modernc.org/token v1.1.0 // indirect
 	star-tex.org/x/tex v0.7.1 // indirect

go.sum

@@ -20,16 +20,18 @@ github.com/ByteArena/poly2tri-go v0.0.0-20170716161910-d102ad91854f h1:l7moT9o/v
 github.com/ByteArena/poly2tri-go v0.0.0-20170716161910-d102ad91854f/go.mod h1:vIOkSdX3NDCPwgu8FIuTat2zDF0FPXXQ0RYFRy+oQic=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b h1:slYM766cy2nI3BwyRiyQj/Ud48djTMtMebDqepE95rw=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b/go.mod h1:1KcenG0jGWcpt8ov532z81sp/kMMUG485J2InIOyADM=
-github.com/andybalholm/brotli v1.2.6 h1:ftYnfj6usCp+UGV5kSJ3+chpMQgU+gJf/AxsUQ52REI=
+github.com/andybalholm/brotli v1.2.7 h1:UgafRPGMam5ySHfRkhthMqOFA6IFoeF3D7mWIDLjG5A=
-github.com/andybalholm/brotli v1.2.6/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/andybalholm/brotli v1.2.7/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/benoitkugler/pstokenizer v1.0.0/go.mod h1:l1G2Voirz0q/jj0TQfabNxVsa8HZXh/VMxFSRALWTiE=
 github.com/benoitkugler/textlayout v0.3.2 h1:Y/LTkwpQ9G0Fia9yhPmZA9IR5AnE8Cq30j3C+Gx5/IE=
 github.com/benoitkugler/textlayout v0.3.2/go.mod h1:o+1hFV+JSHBC9qNLIuwVoLedERU7sBPgEFcuSgfvi/w=
 github.com/benoitkugler/textlayout-testdata v0.1.1/go.mod h1:i/qZl09BbUOtd7Bu/W1CAubRwTWrEXWq6JwMkw8wYxo=
 github.com/benoitkugler/textprocessing v0.0.6 h1:obkMyj62GEPg3xUVYqROlCN22z1OleuZm6ULqX9Om1g=
 github.com/benoitkugler/textprocessing v0.0.6/go.mod h1:Io0gN08/PXEzrSOWFa88xHx2Xv3VjvLMY7H76YoI23A=
-github.com/emmansun/gmsm v0.45.0 h1:PU/6ObyR3g05YN3jn1L5GZDowzyAi8Xhkq4svzYNyiA=
+github.com/ebitengine/purego v0.11.2 h1:WWiTx8rD8zYdOwSj8O/NiNbsOvSAgJMTlyV1XlbUSeU=
-github.com/emmansun/gmsm v0.45.0/go.mod h1:HgLSvmdePGLo+Fo2PNgdTQU6lqAepSyriSQJRpECY6w=
+github.com/ebitengine/purego v0.11.2/go.mod h1:DCHPP08djqhNSoTfImcnHYQRZmd0qhakvrozqaEYhGQ=
+github.com/emmansun/gmsm v0.45.2 h1:GUqMkdHDrEvxqcRtIfhkyqMzgwtiQsnCVYtioOdYlQc=
+github.com/emmansun/gmsm v0.45.2/go.mod h1:RfnfrzyB9XbDi73nF1NHbJeqJj+a6pg/pXr5lrZKMok=
 github.com/go-fonts/latin-modern v0.3.3 h1:g2xNgI8yzdNzIVm+qvbMryB6yGPe0pSMss8QT3QwlJ0=
 github.com/go-fonts/latin-modern v0.3.3/go.mod h1:tHaiWDGze4EPB0Go4cLT5M3QzRY3peya09Z/8KSCrpY=
 github.com/go-text/typesetting v0.3.5 h1:XZPUooClHY0Vf/rFyUyuPRNEkawARaFzLMQcXLSEyPk=
@@ -58,12 +60,14 @@ github.com/tdewolff/parse/v2 v2.8.16 h1:bLk5svUOQRkW/Y2SJ+DeENSIkZBcTIkq+Atyv5D8
 github.com/tdewolff/parse/v2 v2.8.16/go.mod h1:XdsoSFThlVIRIajAuqz1evNY7bagZS8LBOPA3aVopwQ=
 github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
-github.com/xiaoqidun/j2kgo v1.0.1 h1:W0SytzjvgiOhXwq+JNRSVKLB847fjGOvGWTNKqmwvo0=
+github.com/xiaoqidun/guigo v0.0.0-20261030153939-c39abf593a0f h1:wek1tEiTjf0i5eT6w6ILJLEPwdXP+TaH3qtRBOO1xeI=
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-github.com/xiaoqidun/jbig2 v1.1.7 h1:118d2lQn2ZsupmXazK+2p23Jp5xQ09btBmPUoYoa/+Y=
+github.com/xiaoqidun/j2kgo v1.0.2 h1:OAjjEOfaBaQzBNcj9wx+eM68UI5pewR6SzNZa1R1DIw=
-github.com/xiaoqidun/jbig2 v1.1.7/go.mod h1:9jromqVwMqlptUDEt6Yip8vqYA5I1YjhG7FgMl/Z2dA=
+github.com/xiaoqidun/j2kgo v1.0.2/go.mod h1:DCwAfuDzCDYqUiAlZ7BDwigTjaXw7o9L1FtEma/D1aA=
-github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5 h1:eJuai2A2q9R8Mo/oKXiIpNc41uzolkKplPWXUmYiHcU=
+github.com/xiaoqidun/jbig2 v1.1.8 h1:dERPW7F8gs18a/DOD9gXHR3fP1Vl6KhCNsLnq5l3BIo=
-github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5/go.mod h1:FUQ8+TfNoec6tZCdsckx+rrD25JACm7EzuZyFH37QHg=
+github.com/xiaoqidun/jbig2 v1.1.8/go.mod h1:9jromqVwMqlptUDEt6Yip8vqYA5I1YjhG7FgMl/Z2dA=
+github.com/xiaoqidun/pdfgo v0.0.0-20261026125713-90454771d5d0 h1:fBOCrYQedZ3ZxAlpI5bXeVs+/kWxWbVrt0iFlmTYMpU=
+github.com/xiaoqidun/pdfgo v0.0.0-20261026125713-90454771d5d0/go.mod h1:AaabzsObZ8Z76AcaWbo6swRROrJsblyIGB7HbieeJA4=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=

internal/base/file/file.go

@@ -0,0 +1,232 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package file
+
+import (
+	"context"
+	"crypto/rand"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+// ErrChanged 表示目标文件已被其他操作修改
+var ErrChanged = errors.New("file changed since opening")
+
+// ErrBusy 表示目标文件正在写入
+var ErrBusy = errors.New("file save is in progress")
+
+// activeFiles 协调当前进程内的目标写入
+var activeFiles sync.Map
+
+// Target 保存文件路径及最近确认的文件状态，可跨次写入复用
+type Target struct {
+	mu   sync.Mutex
+	name string
+	info os.FileInfo
+}
+
+// Writer 写入同目录临时文件，提交前检查取消及目标冲突
+type Writer struct {
+	mu     sync.Mutex
+	target *Target
+	file   *os.File
+	ctx    context.Context
+	err    error
+	closed bool
+}
+
+// NewTemp 创建私有输入缓存文件，调用方负责关闭和删除
+// 入参: directory 缓存目录，空值使用系统临时目录
+// 返回: *os.File 缓存文件, error 创建错误
+func NewTemp(directory string) (*os.File, error) {
+	if directory == "" {
+		directory = os.TempDir()
+	}
+	for range 100 {
+		n, err := rand.Int(rand.Reader, big.NewInt(10000000))
+		if err != nil {
+			return nil, err
+		}
+		name := filepath.Join(directory, fmt.Sprintf("ofdgo-%07d.tmp", n.Int64()))
+		file, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
+		if errors.Is(err, os.ErrExist) {
+			continue
+		}
+		return file, err
+	}
+	return nil, os.ErrExist
+}
+
+// NewTarget 记录目标当前状态，允许目标尚不存在
+// 入参: name 目标路径
+// 返回: *Target 保存目标, error 路径或文件错误
+func NewTarget(name string) (*Target, error) {
+	if name == "" {
+		return nil, os.ErrInvalid
+	}
+	name, err := filepath.Abs(name)
+	if err != nil {
+		return nil, err
+	}
+	info, err := os.Lstat(name)
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		return nil, err
+	}
+	if info != nil && !info.Mode().IsRegular() {
+		return nil, fmt.Errorf("save target is not a regular file")
+	}
+	return &Target{name: name, info: info}, nil
+}
+
+// check 检查目标是否保持最近确认的状态
+// 返回: error 文件状态错误
+func (t *Target) check() error {
+	info, err := os.Lstat(t.name)
+	if errors.Is(err, os.ErrNotExist) {
+		if t.info == nil {
+			return nil
+		}
+		return ErrChanged
+	}
+	if err != nil {
+		return err
+	}
+	if t.info == nil || !os.SameFile(t.info, info) || t.info.Size() != info.Size() || !t.info.ModTime().Equal(info.ModTime()) {
+		return ErrChanged
+	}
+	if info.Mode().Perm()&0222 == 0 {
+		return os.ErrPermission
+	}
+	return nil
+}
+
+// Begin 创建独占写入事务，调用方必须提交或终止
+// 入参: ctx 取消上下文
+// 返回: *Writer 事务, error 创建错误
+func (t *Target) Begin(ctx context.Context) (*Writer, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if _, loaded := activeFiles.LoadOrStore(t.name, true); loaded {
+		return nil, ErrBusy
+	}
+	if err := t.check(); err != nil {
+		activeFiles.Delete(t.name)
+		return nil, err
+	}
+	for range 100 {
+		n, err := rand.Int(rand.Reader, big.NewInt(10000000))
+		if err != nil {
+			activeFiles.Delete(t.name)
+			return nil, err
+		}
+		name := fmt.Sprintf("%s.%07d.tmp", t.name, n.Int64())
+		f, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
+		if errors.Is(err, os.ErrExist) {
+			continue
+		}
+		if err != nil {
+			activeFiles.Delete(t.name)
+			return nil, err
+		}
+		return &Writer{target: t, file: f, ctx: ctx}, nil
+	}
+	activeFiles.Delete(t.name)
+	return nil, os.ErrExist
+}
+
+// Write 追加数据并记录写入错误
+// 入参: data 数据
+// 返回: int 写入长度, error 写入错误
+func (w *Writer) Write(data []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.closed {
+		return 0, os.ErrClosed
+	}
+	if w.err == nil {
+		w.err = w.ctx.Err()
+	}
+	if w.err != nil {
+		return 0, w.err
+	}
+	n, err := w.file.Write(data)
+	if err == nil && n != len(data) {
+		err = io.ErrShortWrite
+	}
+	w.err = err
+	return n, err
+}
+
+// Commit 完成写入并替换目标，成功后刷新目标状态
+// 返回: error 提交错误
+func (w *Writer) Commit() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.closed {
+		return os.ErrClosed
+	}
+	w.closed = true
+	defer activeFiles.Delete(w.target.name)
+	defer os.Remove(w.file.Name())
+	w.target.mu.Lock()
+	defer w.target.mu.Unlock()
+	if err := errors.Join(w.err, w.ctx.Err(), w.target.check()); err != nil {
+		return errors.Join(err, w.file.Close())
+	}
+	if w.target.info != nil {
+		if err := w.file.Chmod(w.target.info.Mode().Perm()); err != nil {
+			return errors.Join(err, w.file.Close())
+		}
+	}
+	if err := w.file.Sync(); err != nil {
+		return errors.Join(err, w.file.Close())
+	}
+	info, err := w.file.Stat()
+	if err = errors.Join(err, w.file.Close(), w.ctx.Err()); err != nil {
+		return err
+	}
+	if err := w.target.check(); err != nil {
+		return err
+	}
+	if err := Replace(w.file.Name(), w.target.name); err != nil {
+		return err
+	}
+	w.target.info = info
+	if current, err := os.Stat(w.target.name); err == nil {
+		w.target.info = current
+	}
+	return nil
+}
+
+// Abort 丢弃临时输出，不改变目标
+// 返回: error 清理错误
+func (w *Writer) Abort() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.closed {
+		return nil
+	}
+	w.closed = true
+	defer activeFiles.Delete(w.target.name)
+	return errors.Join(w.file.Close(), os.Remove(w.file.Name()))
+}

internal/base/file/file_other.go

@@ -0,0 +1,33 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !windows
+
+package file
+
+import "os"
+
+// Open 打开文件，路径替换后已有读取句柄仍有效
+// 入参: name 文件路径
+// 返回: *os.File 文件, error 打开错误
+func Open(name string) (*os.File, error) {
+	return os.Open(name)
+}
+
+// Replace 替换目标路径
+// 入参: source 临时路径, target 目标路径
+// 返回: error 替换错误
+func Replace(source, target string) error {
+	return os.Rename(source, target)
+}

internal/base/file/file_windows.go

@@ -0,0 +1,81 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package file
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+// replaceFileProc 保留目标文件属性并替换文件内容
+var replaceFileProc = syscall.NewLazyDLL("kernel32.dll").NewProc("ReplaceFileW")
+
+// Open 保留替换共享权限，路径替换后已有读取句柄仍有效
+// 入参: name 文件路径
+// 返回: *os.File 文件, error 打开错误
+func Open(name string) (*os.File, error) {
+	path, err := nativePath(name)
+	if err != nil {
+		return nil, err
+	}
+	handle, err := syscall.CreateFile(path, syscall.GENERIC_READ, syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE, nil, syscall.OPEN_EXISTING, syscall.FILE_ATTRIBUTE_NORMAL, 0)
+	if err != nil {
+		return nil, &os.PathError{Op: "open", Path: name, Err: err}
+	}
+	return os.NewFile(uintptr(handle), name), nil
+}
+
+// Replace 替换目标，目标不存在时重命名
+// 入参: source 临时路径, target 目标路径
+// 返回: error 替换错误
+func Replace(source, target string) error {
+	from, err := nativePath(source)
+	if err != nil {
+		return err
+	}
+	to, err := nativePath(target)
+	if err != nil {
+		return err
+	}
+	result, _, err := replaceFileProc.Call(uintptr(unsafe.Pointer(to)), uintptr(unsafe.Pointer(from)), 0, 0, 0, 0)
+	if result != 0 {
+		return nil
+	}
+	if err == syscall.ERROR_FILE_NOT_FOUND {
+		return os.Rename(source, target)
+	}
+	return &os.LinkError{Op: "replace", Old: source, New: target, Err: err}
+}
+
+// nativePath 转换绝对长路径
+// 入参: name 路径
+// 返回: *uint16 原生路径, error 转换错误
+func nativePath(name string) (*uint16, error) {
+	path, err := filepath.Abs(name)
+	if err != nil {
+		return nil, err
+	}
+	if !strings.HasPrefix(path, `\\?\`) {
+		if strings.HasPrefix(path, `\\`) {
+			path = `\\?\UNC\` + path[2:]
+		} else {
+			path = `\\?\` + path
+		}
+	}
+	return syscall.UTF16PtrFromString(path)
+}

internal/base/font/cff.go

@@ -131,6 +131,14 @@ func NormalizeCFFCharstringsAt(data []byte, unitsPerEm uint16) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	if _, cid := dict[1230]; !cid {
+		for op := 1231; op <= 1238; op++ {
+			if _, exists := dict[op]; exists {
+				delete(dict, op)
+				changed = true
+			}
+		}
+	}
 	if transform != nil {
 		scale := 1 / float64(unitsPerEm)
 		dict[1207] = []float64{scale, 0, 0, scale, 0, 0}
@@ -260,6 +268,21 @@ func SanitizeCFF(data []byte) ([]byte, error) {
 		if kind == 1 {
 			return normalizeCFFType1(data, topDict)
 		}
+		private, err := readType2Private(data, topDict[18], &type2Font{})
+		if err != nil {
+			return nil, err
+		}
+		count := len(private)
+		if err := normalizeCFFPrivate(private); err != nil {
+			return nil, err
+		}
+		if len(private) != count {
+			font, err := readType2Font(data)
+			if err != nil {
+				return nil, err
+			}
+			return rebuildNamedCFF(data, font, font.chars, nil)
+		}
 		return data, nil
 	}
 	fdArrOff, err := cffDictOffset(data, topDict, 1236)
@@ -316,10 +339,9 @@ func SanitizeCFF(data []byte) ([]byte, error) {
 		localSubrData = data[start:end]
 	}
 	charStringsData := data[charStringsOff:charEnd]
-	delete(topDict, 1230)
+	for op := 1230; op <= 1238; op++ {
-	delete(topDict, 1236)
+		delete(topDict, op)
-	delete(topDict, 1237)
+	}
-	delete(topDict, 1234)
 	delete(topDict, 15)
 	delete(topDict, 16)
 	var finalPrivData []byte
@@ -342,17 +364,21 @@ func SanitizeCFF(data []byte) ([]byte, error) {
 	return encodeSanitizedCFF(data[:hdrSize], nameIndexData, topDict, stringIndexData, globalSubrIndexData, charStringsData, finalPrivData, localSubrData), nil
 }
 
-// normalizeCFFPrivate 移除旧版CFF中不生效的缺省字段，拒绝需要额外解释的取值
+// normalizeCFFPrivate 移除废弃的加粗阈值及未加密标记，拒绝加密字形程序
 // 入参: dict 私有字典
 // 返回: error 不支持的旧版行为
 func normalizeCFFPrivate(dict cffDict) error {
-	for op, value := range map[int]float64{1215: 0, 1216: -1} {
+	if values, ok := dict[1215]; ok {
-		if values, ok := dict[op]; ok {
+		if len(values) != 1 || !finite(values[0]) {
-			if len(values) != 1 || values[0] != value {
+			return fmt.Errorf("invalid legacy CFF bold threshold")
-				return fmt.Errorf("unsupported legacy CFF private operator %d", op)
 		}
-			delete(dict, op)
+		delete(dict, 1215)
 	}
+	if values, ok := dict[1216]; ok {
+		if len(values) != 1 || values[0] != -1 {
+			return fmt.Errorf("unsupported legacy CFF private operator 1216")
+		}
+		delete(dict, 1216)
 	}
 	return nil
 }
@@ -475,10 +501,9 @@ func sanitizeMultiFDCFF(data []byte, hdrSize int, nameIndexData []byte, topDict
 		}
 		inlined[gid] = output.Bytes()
 	}
-	delete(topDict, 1230)
+	for op := 1230; op <= 1238; op++ {
-	delete(topDict, 1236)
+		delete(topDict, op)
-	delete(topDict, 1237)
+	}
-	delete(topDict, 1234)
 	delete(topDict, 15)
 	delete(topDict, 16)
 	delete(topDict, 1206)
@@ -826,10 +851,8 @@ func encodeNumberCFF(buf *bytes.Buffer, val float64) {
 // 返回: []byte 编码后的索引数据
 func encodeCFFIndex(items []([]byte)) []byte {
 	count := len(items)
-	buf := new(bytes.Buffer)
-	binary.Write(buf, binary.BigEndian, uint16(count))
 	if count == 0 {
-		return buf.Bytes()
+		return []byte{0, 0}
 	}
 	totalSize := 0
 	for _, item := range items {
@@ -845,25 +868,21 @@ func encodeCFFIndex(items []([]byte)) []byte {
 	if totalSize+1 > 16777215 {
 		offSize = 4
 	}
-	buf.WriteByte(byte(offSize))
+	base := 3 + (count+1)*offSize
+	data := make([]byte, base+totalSize)
+	binary.BigEndian.PutUint16(data, uint16(count))
+	data[2] = byte(offSize)
 	offset := 1
-	putOffset(buf, offset, offSize)
+	for i := 0; i <= count; i++ {
-	for _, item := range items {
+		for j := 0; j < offSize; j++ {
-		offset += len(item)
+			data[3+i*offSize+offSize-1-j] = byte(offset >> (8 * j))
-		putOffset(buf, offset, offSize)
 		}
-	for _, item := range items {
+		if i < count {
-		buf.Write(item)
+			copy(data[base+offset-1:], items[i])
+			offset += len(items[i])
 		}
-	return buf.Bytes()
 	}
-
+	return data
-// putOffset 写入指定大小的偏移量
-// 入参: buf 缓冲区, val 偏移值, size 字节大小
-func putOffset(buf *bytes.Buffer, val int, size int) {
-	tmp := make([]byte, 4)
-	binary.BigEndian.PutUint32(tmp, uint32(val))
-	buf.Write(tmp[4-size:])
 }
 
 // getCFFIndexCount 读取CFF索引的计数和大小
@@ -1042,6 +1061,9 @@ func getCFFCharsetInfo(data []byte, numGlyphs int) ([]int, string, string, int,
 	if topDictData == nil {
 		return nil, "", "", 0, false
 	}
+	if _, _, _, err := scanCFFIndex(data, stringIndexOff); err != nil {
+		return nil, "", "", 0, false
+	}
 	td := parseCFFDict(topDictData)
 	registry, ordering := getCFFROS(data, stringIndexOff, td)
 	actual, err := parseCFFAndCountGlyphs(data)
@@ -1073,7 +1095,18 @@ func getCmapFromCFF(data []byte, numGlyphs int) map[rune]uint16 {
 	if !ok {
 		return nil
 	}
-	mapping := make(map[rune]uint16)
+	return cffCharsetMapping(data, sids, registry, ordering, stringIndexOff)
+}
+
+// cffCharsetMapping 根据已解析的CFF字符集恢复Unicode映射
+// 入参: data CFF数据, sids 字符标识, registry 注册机构, ordering 字符集, stringIndexOff 字符串索引偏移
+// 返回: map[rune]uint16 恢复的映射表
+func cffCharsetMapping(data []byte, sids []int, registry, ordering string, stringIndexOff int) map[rune]uint16 {
+	capacity := max(0, len(sids)-1)
+	if registry == "" || registry == "Adobe" && ordering == "GB1" {
+		capacity *= 2
+	}
+	mapping := make(map[rune]uint16, capacity)
 	if registry == "Adobe" && ordering == "GB1" {
 		for gid, cid := range sids {
 			if gid == 0 {
@@ -1106,7 +1139,7 @@ func getCmapFromCFF(data []byte, numGlyphs int) map[rune]uint16 {
 			}
 		} else {
 			idx := sid - 391
-			name = readStringIndexItem(data, stringIndexOff, idx)
+			name = string(readStringIndexItem(data, stringIndexOff, idx))
 		}
 		r := rune(0)
 		if name != "" {
@@ -1133,11 +1166,11 @@ func GetCFFCIDRuneMap(data []byte) map[uint16]rune {
 	if err != nil {
 		return nil
 	}
-	sids, registry, _, _, ok := getCFFCharsetInfo(cffData, numGlyphs)
+	sids, registry, ordering, stringIndexOff, ok := getCFFCharsetInfo(cffData, numGlyphs)
 	if !ok || registry == "" {
 		return nil
 	}
-	mapping := getCmapFromCFF(cffData, numGlyphs)
+	mapping := cffCharsetMapping(cffData, sids, registry, ordering, stringIndexOff)
 	if len(mapping) == 0 {
 		return nil
 	}
@@ -1193,7 +1226,7 @@ func getCFFData(data []byte) []byte {
 		}
 		offset := int(binary.BigEndian.Uint32(data[pos+8 : pos+12]))
 		length := int(binary.BigEndian.Uint32(data[pos+12 : pos+16]))
-		if offset < 0 || length < 0 || offset+length > len(data) {
+		if offset < 0 || length < 0 || offset > len(data) || length > len(data)-offset {
 			return nil
 		}
 		return data[offset : offset+length]
@@ -1275,31 +1308,29 @@ func parseCFFCharset(data []byte, offset, count int) ([]int, error) {
 
 // readStringIndexItem 读取CFF字符串索引项
 // 入参: data CFF数据, offset 索引偏移, idx 索引号
-// 返回: string 读取的字符串
+// 返回: []byte 共享原始数据的只读字符串，索引无效时为nil
-func readStringIndexItem(data []byte, offset int, idx int) string {
+func readStringIndexItem(data []byte, offset int, idx int) []byte {
-	if offset >= len(data) {
+	if offset < 0 || offset > len(data)-2 || idx < 0 {
-		return ""
+		return nil
 	}
 	count := int(binary.BigEndian.Uint16(data[offset:]))
+	if idx >= count || offset > len(data)-3 {
+		return nil
+	}
 	offSize := int(data[offset+2])
-	if idx >= count {
+	if offSize < 1 || offSize > 4 || count+1 > (len(data)-offset-3)/offSize {
-		return ""
+		return nil
 	}
 	offArrayStart := offset + 3
 	p1 := offArrayStart + idx*offSize
 	p2 := p1 + offSize
-	if p2+offSize > len(data) {
-		return ""
-	}
 	loc1 := readCFFOffset(data, p1, offSize)
 	loc2 := readCFFOffset(data, p2, offSize)
 	dataStart := offArrayStart + (count+1)*offSize
-	start := dataStart + loc1 - 1
+	if loc1 < 1 || loc2 < loc1 || loc2-1 > len(data)-dataStart {
-	length := loc2 - loc1
+		return nil
-	if start < 0 || start+length > len(data) {
-		return ""
 	}
-	return string(data[start : start+length])
+	return data[dataStart+loc1-1 : dataStart+loc2-1]
 }
 
 // getCFFROS 读取CID字体ROS信息
@@ -1323,7 +1354,7 @@ func getCFFSIDString(data []byte, stringIndexOff int, sid int) string {
 		return cffStandardStrings[sid]
 	}
 	if sid > 390 {
-		return readStringIndexItem(data, stringIndexOff, sid-391)
+		return string(readStringIndexItem(data, stringIndexOff, sid-391))
 	}
 	return ""
 }

internal/base/font/cff_subset.go

@@ -231,6 +231,9 @@ func rebuildNamedCFF(data []byte, font *type2Font, chars [][]byte, ids []uint16)
 	if err != nil {
 		return nil, err
 	}
+	if err := normalizeCFFPrivate(private); err != nil {
+		return nil, err
+	}
 	privateData, err := encodeCFFSubsetPrivate(private)
 	if err != nil {
 		return nil, err

internal/base/font/file.go

@@ -16,6 +16,7 @@ package font
 
 import (
 	"bytes"
+	"crypto/sha256"
 	"encoding/binary"
 	"fmt"
 	"strings"
@@ -23,6 +24,8 @@ import (
 )
 
 // Face 字体文件中的字体名称与零起始索引，不依赖文件名
+// Family和Style为排版族，MenuFamily和MenuStyle为兼容四款式的菜单名称
+// FamilyKey区分兼容族、厂商和版本，未知时为空；Bold和Italic表示字体固有样式
 type Face struct {
 	Index          int      `json:"index"`
 	FullName       string   `json:"fullName"`
@@ -30,12 +33,24 @@ type Face struct {
 	Style          string   `json:"style"`
 	PostScriptName string   `json:"postscriptName"`
 	Names          []string `json:"names"`
+	MenuFamily     string   `json:"menuFamily"`
+	MenuStyle      string   `json:"menuStyle"`
+	FamilyKey      string   `json:"familyKey"`
+	Bold           bool     `json:"bold"`
+	Italic         bool     `json:"italic"`
 }
 
 // FaceInfo 从名称表读取字体信息
 // 入参: data 名称表数据, index 零起始字体索引
 // 返回: Face 字体信息
 func FaceInfo(data []byte, index int) Face {
+	return faceInfoLanguage(data, index, 0xffff, 0xffff)
+}
+
+// faceInfoLanguage 优先读取指定平台和语言的显示名称，保留标识及全部别名
+// 入参: data 名称表数据, index 字体索引, platform 平台标识, language 语言标识
+// 返回: Face 字体信息
+func faceInfoLanguage(data []byte, index int, platform, language uint16) Face {
 	records, values := fontNameValues(data)
 	name := func(ids ...uint16) string {
 		for _, id := range ids {
@@ -49,7 +64,52 @@ func FaceInfo(data []byte, index int) Face {
 		}
 		return ""
 	}
-	return Face{Index: index, FullName: name(4, 6, 16, 1), Family: name(16, 1), Style: name(17, 2), PostScriptName: name(6), Names: fontNamesFromValues(records, values)}
+	localized := func(ids ...uint16) string {
+		for _, id := range ids {
+			for _, record := range records {
+				if record.Platform == platform && record.Language == language && record.Name == id {
+					if value := strings.TrimSpace(values[[4]uint16{record.Platform, record.Encoding, record.Language, id}]); value != "" {
+						return value
+					}
+				}
+			}
+		}
+		return name(ids...)
+	}
+	key := ""
+	if family, version := name(1), name(5); family != "" && version != "" {
+		key = fmt.Sprintf("%x", sha256.Sum256([]byte(strings.Join([]string{family, version, name(8)}, "\x00"))))
+	}
+	family, style := localized(1), localized(2)
+	if family == "" {
+		family = localized(16, 4, 6)
+	}
+	if style == "" {
+		style = localized(17)
+	}
+	return Face{Index: index, FullName: localized(4, 6, 16, 1), Family: localized(16, 1), Style: localized(17, 2), PostScriptName: name(6), Names: fontNamesFromValues(records, values), MenuFamily: family, MenuStyle: style, FamilyKey: key}
+}
+
+// TableFaceInfo 读取名称及字体固有款式，名称键不随显示语言变化
+// 入参: tables 字体表, index 集合索引, platform 平台标识, language 语言标识
+// 返回: Face 字体信息
+func TableFaceInfo(tables map[string][]byte, index int, platform, language uint16) Face {
+	face := faceInfoLanguage(tables["name"], index, platform, language)
+	key := face.FamilyKey
+	if head := tables["head"]; len(head) >= 46 {
+		key += string(head[4:8])
+		style := binary.BigEndian.Uint16(head[44:])
+		face.Bold, face.Italic = style&1 != 0, style&2 != 0
+	}
+	if os2 := tables["OS/2"]; len(os2) >= 64 {
+		key += string(os2[58:62])
+		style := binary.BigEndian.Uint16(os2[62:])
+		face.Bold, face.Italic = style&32 != 0, style&1 != 0 || style&512 != 0
+	}
+	if face.FamilyKey != "" {
+		face.FamilyKey = fmt.Sprintf("%x", sha256.Sum256([]byte(key)))
+	}
+	return face
 }
 
 // FileCount 校验字体或集合头并读取字体数量
@@ -78,6 +138,13 @@ func FileCount(data []byte) (int, error) {
 // 入参: data OpenType数据
 // 返回: []Face 字体列表, error 格式或名称表错误
 func ReadFaces(data []byte) ([]Face, error) {
+	return ReadLocalizedFaces(data, 0xffff, 0xffff)
+}
+
+// ReadLocalizedFaces 读取指定平台和语言的字体名称，缺失时沿用名称表顺序
+// 入参: data OpenType数据, platform 名称表平台标识, language 名称表语言标识
+// 返回: []Face 字体列表, error 格式或名称表错误
+func ReadLocalizedFaces(data []byte, platform, language uint16) ([]Face, error) {
 	count, err := FileCount(data)
 	if err != nil {
 		return nil, err
@@ -88,7 +155,7 @@ func ReadFaces(data []byte) ([]Face, error) {
 		if err != nil {
 			return nil, err
 		}
-		face := FaceInfo(tables["name"], index)
+		face := TableFaceInfo(tables, index, platform, language)
 		if face.FullName == "" {
 			return nil, fmt.Errorf("font %d has no usable name", index)
 		}

internal/base/font/glyf.go

@@ -235,7 +235,7 @@ func (f *Outliner) phantomPoints(id uint16, data []byte) [4]ttPoint {
 	return [4]ttPoint{{x: left * 64, ox: left * 64}, {x: (left + int32(f.Font.GlyphAdvance(id))) * 64, ox: (left + int32(f.Font.GlyphAdvance(id))) * 64}, {y: top * 64, oy: top * 64}, {y: (top - int32(f.Font.GlyphVerticalAdvance(id))) * 64, oy: (top - int32(f.Font.GlyphVerticalAdvance(id))) * 64}}
 }
 
-// ttRecoverableHint 判断栈参数、指令引用或控制流错误是否允许保留执行前轮廓
+// ttRecoverableHint 判断栈参数、区点轮廓及函数引用或控制流错误是否允许保留执行前轮廓
 // 入参: err 指令错误
 // 返回: bool 是否可恢复
 func ttRecoverableHint(err error) bool {

internal/base/font/hint.go

@@ -25,7 +25,7 @@ import (
 // errTTStackUnderflow 表示字形程序缺少必需的栈参数
 var errTTStackUnderflow = errors.New("TrueType instruction stack underflow")
 
-// errTTInvalidReference 表示字形指令引用不存在的点或函数
+// errTTInvalidReference 表示字形指令引用不存在的区、点、轮廓或函数
 var errTTInvalidReference = errors.New("invalid TrueType instruction reference")
 
 // errTTInvalidControlFlow 表示条件分支未闭合或跳转超出字节码范围
@@ -380,7 +380,8 @@ func (v *ttInterpreter) execute(code []byte, depth int) error {
 			case op >= 0x13 && op <= 0x16:
 				z := v.pop()
 				if z < 0 || z > 1 {
-					return fmt.Errorf("invalid TrueType zone")
+					v.err = fmt.Errorf("%w: zone %d", errTTInvalidReference, z)
+					break
 				}
 				if op == 0x16 {
 					g.zone = [3]int32{z, z, z}
@@ -854,7 +855,7 @@ func (v *ttInterpreter) shift(op byte) {
 	if op <= 0x35 {
 		contour := v.pop()
 		if contour < 0 || int64(contour) >= int64(len(v.ends)) {
-			v.err = fmt.Errorf("invalid TrueType contour reference")
+			v.err = fmt.Errorf("%w: contour %d", errTTInvalidReference, contour)
 			return
 		}
 		if contour > 0 {
@@ -864,7 +865,7 @@ func (v *ttInterpreter) shift(op byte) {
 	} else {
 		target = v.pop()
 		if target < 0 || target > 1 {
-			v.err = fmt.Errorf("invalid TrueType zone")
+			v.err = fmt.Errorf("%w: zone %d", errTTInvalidReference, target)
 			return
 		}
 		to = len(v.zones[target])

internal/base/font/match.go

@@ -174,7 +174,7 @@ func NormalizeName(name string) string {
 // 返回: bool 是否为字体文件
 func IsFontFileName(name string) bool {
 	switch strings.ToLower(path.Ext(name)) {
-	case ".ttf", ".otf", ".ttc":
+	case ".ttf", ".otf", ".ttc", ".otc":
 		return true
 	default:
 		return false

internal/base/font/name.go

@@ -142,7 +142,7 @@ func fontNameValues(data []byte) ([]fontNameRecord, map[[4]uint16]string) {
 	values := make(map[[4]uint16]string)
 	for _, record := range records {
 		switch record.Name {
-		case 1, 2, 4, 6, 16, 17:
+		case 1, 2, 4, 5, 6, 8, 16, 17:
 		default:
 			continue
 		}

internal/base/font/sfnt.go

@@ -17,9 +17,11 @@ package font
 import (
 	"encoding/binary"
 	"fmt"
+	"iter"
 	"maps"
 	"slices"
 	"sync"
+	"unicode/utf8"
 
 	"github.com/go-text/typesetting/font/opentype/tables"
 )
@@ -34,10 +36,12 @@ type SFNT struct {
 	reverse                            map[uint16][]rune
 }
 
-// sfntCmap 保存编码记录及对应字符映射，标记已解析的共享子表
+// sfntCmap 保存编码记录及字符映射，连续区间与共享子表不重复展开
 type sfntCmap struct {
 	platform, encoding, format uint16
 	mapping                    map[rune]uint16
+	groups                     []byte
+	entries                    uint64
 	duplicate                  bool
 }
 
@@ -90,7 +94,7 @@ func ParseSFNTTables(table map[string][]byte) (*SFNT, error) {
 		if cmap.duplicate {
 			continue
 		}
-		for _, glyph := range cmap.mapping {
+		for _, glyph := range cmap.pairs() {
 			if glyph >= f.count {
 				return nil, fmt.Errorf("cmap glyph index out of range")
 			}
@@ -119,7 +123,7 @@ func readSFNTCmaps(data []byte) ([]sfntCmap, error) {
 	}
 	count := int(binary.BigEndian.Uint16(data[2:]))
 	result := make([]sfntCmap, 0, count)
-	parsed := make(map[uint32]map[rune]uint16)
+	parsed := make(map[uint32]sfntCmap)
 	for i := range count {
 		record := data[4+8*i:]
 		offset := binary.BigEndian.Uint32(record[4:])
@@ -128,23 +132,44 @@ func readSFNTCmaps(data []byte) ([]sfntCmap, error) {
 		}
 		sub := data[offset:]
 		format := binary.BigEndian.Uint16(sub)
-		mapping, found := parsed[offset]
+		cmap, found := parsed[offset]
 		if !found {
-			mapping = make(map[rune]uint16)
+			cmap.mapping = make(map[rune]uint16)
 			var err error
 			switch format {
 			case 0:
-				parseCmapFormat0(sub, mapping)
+				parseCmapFormat0(sub, cmap.mapping)
 			case 4:
-				parseCmapFormat4(sub, mapping)
+				parseCmapFormat4(sub, cmap.mapping)
 			case 6:
-				parseCmapFormat6(sub, mapping)
+				parseCmapFormat6(sub, cmap.mapping)
 			case 12:
-				parseCmapFormat12(sub, mapping)
+				if len(sub) >= 16 {
+					length := uint64(binary.BigEndian.Uint32(sub[4:]))
+					count := uint64(binary.BigEndian.Uint32(sub[12:]))
+					if length >= 16 && length <= uint64(len(sub)) && count <= (length-16)/12 {
+						cmap.groups = sub[16 : 16+12*count]
+						for offset := 0; offset < len(cmap.groups); offset += 12 {
+							first := binary.BigEndian.Uint32(cmap.groups[offset:])
+							last := binary.BigEndian.Uint32(cmap.groups[offset+4:])
+							if first > last || offset != 0 && first <= binary.BigEndian.Uint32(cmap.groups[offset-8:]) {
+								cmap.groups = nil
+								parseCmapFormat12(sub, cmap.mapping)
+								break
+							}
+						}
+						if cmap.groups != nil {
+							cmap.mapping = nil
+							for range cmap.pairs() {
+								cmap.entries++
+							}
+						}
+					}
+				}
 			case 2:
-				mapping, err = parseCmapFormat2(sub)
+				cmap.mapping, err = parseCmapFormat2(sub)
 			case 8, 10, 13:
-				mapping, err = parseCmapExtended(sub)
+				cmap.mapping, err = parseCmapExtended(sub)
 			case 14:
 			default:
 				return nil, fmt.Errorf("unsupported cmap format %d", format)
@@ -152,13 +177,67 @@ func readSFNTCmaps(data []byte) ([]sfntCmap, error) {
 			if err != nil {
 				return nil, err
 			}
-			parsed[offset] = mapping
+			parsed[offset] = cmap
 		}
-		result = append(result, sfntCmap{platform: binary.BigEndian.Uint16(record), encoding: binary.BigEndian.Uint16(record[2:]), format: format, mapping: mapping, duplicate: found})
+		cmap.platform, cmap.encoding, cmap.format, cmap.duplicate = binary.BigEndian.Uint16(record), binary.BigEndian.Uint16(record[2:]), format, found
+		result = append(result, cmap)
 	}
 	return result, nil
 }
 
+// pairs 按原映射返回字符与字形，连续编码段不展开存储
+// 返回: iter.Seq2[rune, uint16] 非零有效字符映射
+func (c sfntCmap) pairs() iter.Seq2[rune, uint16] {
+	return func(yield func(rune, uint16) bool) {
+		for char, glyph := range c.mapping {
+			if !yield(char, glyph) {
+				return
+			}
+		}
+		for offset := 0; offset+12 <= len(c.groups); offset += 12 {
+			group := c.groups[offset:]
+			first, last, glyph := binary.BigEndian.Uint32(group), binary.BigEndian.Uint32(group[4:]), binary.BigEndian.Uint32(group[8:])
+			if first > last || first > utf8.MaxRune || glyph > 65535 {
+				continue
+			}
+			end := min(uint64(last), uint64(first)+65535-uint64(glyph), uint64(utf8.MaxRune))
+			for char := uint64(first); char <= end; char++ {
+				id := uint16(uint64(glyph) + char - uint64(first))
+				if id != 0 && utf8.ValidRune(rune(char)) && !yield(rune(char), id) {
+					return
+				}
+			}
+		}
+	}
+}
+
+// lookup 查找原字符映射，连续编码段使用有序区间查询
+// 入参: char 字符
+// 返回: uint16 字形编号, bool 是否存在映射
+func (c sfntCmap) lookup(char rune) (uint16, bool) {
+	if glyph, ok := c.mapping[char]; ok {
+		return glyph, true
+	}
+	if !utf8.ValidRune(char) {
+		return 0, false
+	}
+	low, high := 0, len(c.groups)/12
+	for low < high {
+		middle := low + (high-low)/2
+		group := c.groups[middle*12:]
+		first, last := binary.BigEndian.Uint32(group), binary.BigEndian.Uint32(group[4:])
+		if uint32(char) < first {
+			high = middle
+		} else if uint32(char) > last {
+			low = middle + 1
+		} else {
+			glyph := uint64(binary.BigEndian.Uint32(group[8:])) + uint64(uint32(char)-first)
+			return uint16(glyph), glyph > 0 && glyph <= 65535
+		}
+	}
+	return 0, false
+}
+
 // UnitsPerEm 返回字体设计单位
 // 返回: uint16 每em单位数
 func (f *SFNT) UnitsPerEm() uint16 { return f.units }
@@ -172,7 +251,7 @@ func (f *SFNT) NumGlyphs() uint16 { return f.count }
 func (f *SFNT) CmapEntries() uint64 {
 	var count uint64
 	for _, cmap := range f.cmaps {
-		count += uint64(len(cmap.mapping))
+		count += uint64(len(cmap.mapping)) + cmap.entries
 	}
 	return count
 }
@@ -185,14 +264,14 @@ func (f *SFNT) GlyphIndex(char rune) uint16 {
 		if cmap.duplicate {
 			continue
 		}
-		if gid := cmap.mapping[char]; gid != 0 {
+		if gid, ok := cmap.lookup(char); ok && gid != 0 {
 			return gid
 		}
 	}
 	return 0
 }
 
-// glyphCharacters 返回指向指定字形的全部字符
+// glyphCharacters 返回指向指定字形的全部字符，连续区间按需反查
 // 入参: gid 字形编号
 // 返回: []rune 排序后的字符
 func (f *SFNT) glyphCharacters(gid uint16) []rune {
@@ -204,7 +283,7 @@ func (f *SFNT) glyphCharacters(gid uint16) []rune {
 				continue
 			}
 			for char, glyph := range cmap.mapping {
-				if glyph != 0 && !seen[char] {
+				if glyph != 0 && !seen[char] && f.GlyphIndex(char) == glyph {
 					f.reverse[glyph] = append(f.reverse[glyph], char)
 					seen[char] = true
 				}
@@ -214,7 +293,28 @@ func (f *SFNT) glyphCharacters(gid uint16) []rune {
 			slices.Sort(chars)
 		}
 	})
-	return f.reverse[gid]
+	if gid == 0 {
+		return nil
+	}
+	chars := slices.Clone(f.reverse[gid])
+	for _, cmap := range f.cmaps {
+		if cmap.duplicate {
+			continue
+		}
+		for offset := 0; offset+12 <= len(cmap.groups); offset += 12 {
+			group := cmap.groups[offset:]
+			first, last, glyph := binary.BigEndian.Uint32(group), binary.BigEndian.Uint32(group[4:]), binary.BigEndian.Uint32(group[8:])
+			if first > last || uint32(gid) < glyph {
+				continue
+			}
+			char := uint64(first) + uint64(uint32(gid)-glyph)
+			if char <= uint64(last) && char <= utf8.MaxRune && utf8.ValidRune(rune(char)) && f.GlyphIndex(rune(char)) == gid {
+				chars = append(chars, rune(char))
+			}
+		}
+	}
+	slices.Sort(chars)
+	return slices.Compact(chars)
 }
 
 // GlyphAdvance 返回水平字宽

internal/base/font/subset.go

@@ -197,7 +197,7 @@ func subsetSourceSFNT(sfnt *SFNT, usage *Usage, size int) []byte {
 	for char := range usage.Characters {
 		id := sfnt.GlyphIndex(char)
 		for _, cmap := range unicodeTables {
-			if alternate, ok := cmap.mapping[char]; ok && alternate != id {
+			if alternate, ok := cmap.lookup(char); ok && alternate != id {
 				return nil
 			}
 		}

internal/base/font/ttf.go

@@ -29,7 +29,6 @@ func NormalizeOS2(data []byte) []byte {
 	var size int
 	switch binary.BigEndian.Uint16(data) {
 	case 0:
-		// 旧式68字节表保持原样，不将截断的78字节表推断为旧式表。
 		size = 78
 	case 1:
 		size = 86

internal/base/font/type1.go

@@ -198,6 +198,9 @@ func ParseType1Program(data []byte) (Type1Program, error) {
 		return Type1Program{}, fmt.Errorf("Type1 font has no glyphs")
 	}
 	for index := range program.subrs {
+		if program.subrs[index] == nil {
+			continue
+		}
 		program.subrs[index], err = type1CharString(program.subrs[index], program.lenIV)
 		if err != nil {
 			return Type1Program{}, err
@@ -212,6 +215,61 @@ func ParseType1Program(data []byte) (Type1Program, error) {
 	return program, nil
 }
 
+// NormalizePDFType1 修复完整加密分段之后的PFB明文尾部，不补齐加密或字形数据
+// 入参: data 原始PFB程序
+// 返回: []byte 原程序或独立修复容器, bool 是否修复, error 容器或程序错误
+func NormalizePDFType1(data []byte) ([]byte, bool, error) {
+	if len(data) < 6 || data[0] != 0x80 {
+		return data, false, nil
+	}
+	binarySeen := false
+	for offset := 0; offset+2 <= len(data) && data[offset] == 0x80; {
+		kind := data[offset+1]
+		if kind == 3 {
+			return data, false, nil
+		}
+		if offset+6 > len(data) || kind != 1 && kind != 2 {
+			return data, false, fmt.Errorf("incomplete PFB segment header")
+		}
+		length := uint64(binary.LittleEndian.Uint32(data[offset+2:]))
+		remaining := len(data) - offset - 6
+		if binarySeen && kind == 1 && remaining == 0 {
+			result := append(bytes.Clone(data[:offset]), 0x80, 3)
+			if _, err := ParseType1Program(result); err != nil {
+				return nil, false, err
+			}
+			return result, true, nil
+		}
+		if length > uint64(remaining) {
+			return nil, false, fmt.Errorf("incomplete PFB encrypted or text segment")
+		}
+		if binarySeen && kind == 1 && length == 0 {
+			tail := data[offset+6:]
+			if len(tail) < 2 || !bytes.Equal(tail[len(tail)-2:], []byte{0x80, 3}) {
+				return data, false, fmt.Errorf("unbounded PFB text trailer")
+			}
+			text := bytes.TrimSpace(tail[:len(tail)-2])
+			if !bytes.HasSuffix(text, []byte("cleartomark")) {
+				return data, false, fmt.Errorf("PFB trailer lacks cleartomark")
+			}
+			for _, b := range bytes.TrimSuffix(text, []byte("cleartomark")) {
+				if b != '0' && !type1Space(b) {
+					return data, false, fmt.Errorf("unexpected PFB text trailer")
+				}
+			}
+			result := bytes.Clone(data)
+			binary.LittleEndian.PutUint32(result[offset+2:], uint32(len(tail)-2))
+			if _, err := ParseType1Program(result); err != nil {
+				return nil, false, err
+			}
+			return result, true, nil
+		}
+		binarySeen = binarySeen || kind == 2
+		offset += 6 + int(length)
+	}
+	return data, false, nil
+}
+
 // readType1Header 读取明文字体矩阵及加密数据起点
 // 入参: data Type1程序
 // 返回: []float64 字体矩阵, int 加密起点, error 头部错误

internal/base/font/util.go

@@ -87,23 +87,127 @@ func FileTables(data []byte, index int) (map[string][]byte, error) {
 	return tables, nil
 }
 
+// NormalizePDFProgram 修复可确定的PDF内嵌SFNT封装，不补造TrueType轮廓或字形编号
+// 入参: data 原始字体程序
+// 返回: []byte 原程序或独立修复程序, bool 是否修复, error 无法确认的目录或度量错误
+func NormalizePDFProgram(data []byte) ([]byte, bool, error) {
+	if len(data) < 12 || string(data[:4]) != "OTTO" && string(data[:4]) != "\x00\x01\x00\x00" && string(data[:4]) != "true" {
+		return data, false, nil
+	}
+	count := int(binary.BigEndian.Uint16(data[4:6]))
+	if count == 0 || count > (len(data)-12)/16 {
+		return nil, false, fmt.Errorf("unrecoverable PDF font directory size")
+	}
+	first := len(data)
+	for n := 0; n < count; n++ {
+		record := data[12+n*16:]
+		start, size := uint64(binary.BigEndian.Uint32(record[8:])), uint64(binary.BigEndian.Uint32(record[12:]))
+		if size != 0 && start >= 12 && start+size <= uint64(len(data)) {
+			first = min(first, int(start))
+		}
+	}
+	changed := false
+	if first < 12+count*16 {
+		if (first-12)%16 != 0 {
+			return nil, false, fmt.Errorf("ambiguous PDF font directory overlap")
+		}
+		actual := (first - 12) / 16
+		for n := 0; n < count; n++ {
+			record := data[12+n*16:]
+			printable := true
+			for _, b := range record[:4] {
+				printable = printable && b >= 32 && b <= 126
+			}
+			if printable != (n < actual) {
+				return nil, false, fmt.Errorf("ambiguous PDF font table count")
+			}
+			if n < actual {
+				start, size := uint64(binary.BigEndian.Uint32(record[8:])), uint64(binary.BigEndian.Uint32(record[12:]))
+				if size != 0 && (start < uint64(first) || start+size > uint64(len(data))) {
+					return nil, false, fmt.Errorf("incomplete PDF font table")
+				}
+			}
+		}
+		data = bytes.Clone(data)
+		binary.BigEndian.PutUint16(data[4:6], uint16(actual))
+		changed = true
+	}
+	tables, err := FileTables(data, 0)
+	if err != nil {
+		return nil, false, err
+	}
+	if head := tables["head"]; len(head) > 54 && len(head) <= 57 {
+		tables["head"] = head[:54]
+		changed = true
+	}
+	if hhea := tables["hhea"]; len(hhea) > 36 && len(hhea) <= 39 && binary.BigEndian.Uint32(hhea) == 0x00010000 {
+		tables["hhea"] = hhea[:36]
+		changed = true
+	}
+	if maxp := tables["maxp"]; tables["glyf"] != nil && len(maxp) > 32 && len(maxp) <= 35 && binary.BigEndian.Uint32(maxp) == 0x00010000 {
+		tables["maxp"] = maxp[:32]
+		changed = true
+	}
+	if post := tables["post"]; len(post) > 32 && binary.BigEndian.Uint32(post) == 0x00030000 {
+		tables["post"] = post[:32]
+		changed = true
+	}
+	if cvt := tables["cvt "]; len(cvt)%2 != 0 && cvt[len(cvt)-1] == 0 {
+		tables["cvt "] = cvt[:len(cvt)-1]
+		changed = true
+	}
+	if len(tables["CFF "]) != 0 && len(tables["head"]) == 0 && len(tables["maxp"]) == 0 && len(tables["hhea"]) == 0 && len(tables["hmtx"]) == 0 {
+		program, _, err := WrapCFFToOTF(tables["CFF "])
+		return program, true, err
+	}
+	if maxp := tables["maxp"]; len(tables["CFF "]) != 0 && tables["glyf"] == nil && len(maxp) >= 6 && (binary.BigEndian.Uint32(maxp) == 0x00010000 || binary.BigEndian.Uint32(maxp) == 0x00005000 && len(maxp) != 6) {
+		count, err := parseCFFAndCountGlyphs(tables["CFF "])
+		if err != nil {
+			return nil, false, err
+		}
+		if count != int(binary.BigEndian.Uint16(maxp[4:6])) {
+			program, _, err := WrapCFFToOTF(tables["CFF "])
+			if err != nil {
+				return nil, false, err
+			}
+			rebuilt, err := FileTables(program, 0)
+			if err != nil {
+				return nil, false, err
+			}
+			if len(tables["head"]) < 20 || !bytes.Equal(tables["head"][18:20], rebuilt["head"][18:20]) {
+				return nil, false, fmt.Errorf("CFF and SFNT design units differ")
+			}
+			return program, true, nil
+		}
+		tables["maxp"] = buildCFFMaxpTable(uint16(count))
+		changed = true
+	}
+	if !changed {
+		return data, false, nil
+	}
+	program, err := SerializeOTF(tables)
+	return program, true, err
+}
+
 // calcTableChecksum 计算字体表校验和
 // 入参: data 表数据
 // 返回: uint32 校验和
 func calcTableChecksum(data []byte) uint32 {
-	var sum uint32
+	var a, b, c, d uint32
-	length := len(data)
+	for len(data) >= 16 {
-	for i := 0; i < length; i += 4 {
+		a += binary.BigEndian.Uint32(data[:4])
-		if i+4 <= length {
+		b += binary.BigEndian.Uint32(data[4:8])
-			sum += binary.BigEndian.Uint32(data[i : i+4])
+		c += binary.BigEndian.Uint32(data[8:12])
-		} else {
+		d += binary.BigEndian.Uint32(data[12:16])
-			var val uint32
+		data = data[16:]
-			rem := data[i:]
-			for j, b := range rem {
-				val |= uint32(b) << (24 - 8*j)
 	}
-			sum += val
+	sum := a + b + c + d
+	for len(data) >= 4 {
+		sum += binary.BigEndian.Uint32(data[:4])
+		data = data[4:]
 	}
+	for i, value := range data {
+		sum += uint32(value) << (24 - 8*i)
 	}
 	return sum
 }

internal/base/geom/arc.go

@@ -116,7 +116,7 @@ func centerArc(start Point, arc Segment) (geometryArc, error) {
 	}
 	angle := math.Mod(arc.Rotation, 360) * math.Pi / 180
 	sine, cosine := math.Sincos(angle)
-	dx, dy := (start.X-arc.End.X)/2, (start.Y-arc.End.Y)/2
+	dx, dy := arcCoordinateMean(start.X, -arc.End.X), arcCoordinateMean(start.Y, -arc.End.Y)
 	x, y := cosine*dx+sine*dy, -sine*dx+cosine*dy
 	scale := math.Hypot(x/rx, y/ry)
 	if scale > 1 {
@@ -139,13 +139,24 @@ func centerArc(start Point, arc Segment) (geometryArc, error) {
 	if !arc.Sweep && delta > 0 {
 		delta -= 2 * math.Pi
 	}
-	center := Point{cosine*cx - sine*cy + (start.X+arc.End.X)/2, sine*cx + cosine*cy + (start.Y+arc.End.Y)/2}
+	center := Point{cosine*cx - sine*cy + arcCoordinateMean(start.X, arc.End.X), sine*cx + cosine*cy + arcCoordinateMean(start.Y, arc.End.Y)}
 	if !finite(center.X) || !finite(center.Y) || !finite(rx) || !finite(ry) || !finite(delta) || !finite(theta) || delta == 0 {
 		return geometryArc{}, fmt.Errorf("invalid arc extent")
 	}
 	return geometryArc{center, Point{rx * cosine, rx * sine}, Point{-ry * sine, ry * cosine}, theta, delta}, nil
 }
 
+// arcCoordinateMean 计算有限坐标均值，仅在求和溢出时先减半，避免微小坐标提前下溢
+// 入参: a 第一个坐标, b 第二个坐标
+// 返回: float64 坐标均值
+func arcCoordinateMean(a, b float64) float64 {
+	value := (a + b) / 2
+	if math.IsInf(value, 0) {
+		return a/2 + b/2
+	}
+	return value
+}
+
 // point 计算椭圆参数对应的坐标
 // 入参: angle 参数角
 // 返回: Point 椭圆上的点

internal/base/geom/matrix.go

@@ -125,7 +125,7 @@ func (m Matrix) Invert() (Matrix, bool) {
 	return n, true
 }
 
-// matrixProductDifference 计算两个乘积之差，检查溢出、下溢及相消造成的精度损失
+// matrixProductDifference 补偿乘积相减的舍入残差，检查溢出、下溢及严重相消
 // 入参: a 第一个乘数, b 第二个乘数, c 第三个乘数, d 第四个乘数
 // 返回: float64 乘积之差, bool 是否可直接用于求逆
 func matrixProductDifference(a, b, c, d float64) (float64, bool) {
@@ -134,6 +134,9 @@ func matrixProductDifference(a, b, c, d float64) (float64, bool) {
 	if !finite(value) || x == 0 && a != 0 && b != 0 || y == 0 && c != 0 && d != 0 {
 		return value, false
 	}
+	if x != 0 && y != 0 {
+		value = math.FMA(a, b, -y) + math.FMA(-c, d, y)
+	}
 	return value, x == 0 && y == 0 || math.Abs(value) >= 0x1p-1022 && math.Abs(value) >= 0x1p-48*math.Max(math.Abs(x), math.Abs(y))
 }
 
@@ -169,7 +172,7 @@ func TranslationMatrix(x, y float64) Matrix {
 // YScale 获取Y轴缩放比例
 // 返回: float64 缩放比例
 func (m Matrix) YScale() float64 {
-	return math.Sqrt(m.c*m.c + m.d*m.d)
+	return math.Hypot(m.c, m.d)
 }
 
 // Equal 比较毫米坐标，使用固定绝对误差，不受绘图库全局精度影响

internal/base/geom/stroke.go

@@ -17,6 +17,7 @@ package geom
 import (
 	"fmt"
 	"math"
+	"slices"
 )
 
 // UnsupportedError 表示当前几何实现无法展开的描边形态
@@ -347,7 +348,22 @@ func (line geometryPolyline) stroke(result Path, options StrokeOptions) (Path, e
 		}
 		return result, nil
 	}
-	directions := make([]Point, len(points)-1)
+	segments := len(points) - 1
+	joins := segments - 1
+	caps := 0
+	if line.closed {
+		joins++
+	} else if options.Cap == "Round" {
+		caps = 8
+	} else if options.Cap == "Square" {
+		caps = 10
+	}
+	joinSize := 4
+	if options.Join == "" || options.Join == "Miter" {
+		joinSize = 5
+	}
+	result = slices.Grow(result, min(segments*5+joins*joinSize+caps, 1<<20-len(result)))
+	directions := make([]Point, segments)
 	for i := range directions {
 		a, b := points[i], points[i+1]
 		length := math.Hypot(b.X-a.X, b.Y-a.Y)

internal/base/geom/transform.go

@@ -33,10 +33,7 @@ func (p Path) Transform(matrix Matrix) (Path, error) {
 		}
 	}
 	matrixScale := math.Max(math.Max(math.Abs(matrix.a), math.Abs(matrix.b)), math.Max(math.Abs(matrix.c), math.Abs(matrix.d)))
-	determinant := 0.0
+	determinant, _ := matrixProductSum(matrix.a, matrix.d, -matrix.b, matrix.c)
-	if matrixScale != 0 {
-		determinant = (matrix.a/matrixScale)*(matrix.d/matrixScale) - (matrix.b/matrixScale)*(matrix.c/matrixScale)
-	}
 	transform := func(p Point) Point {
 		x, y := matrix.Transform(p.X, p.Y)
 		return Point{x, y}

internal/base/image/color.go

@@ -96,7 +96,7 @@ func pngColorProfile(ctx context.Context, data []byte) ([]byte, *pngColor, error
 		if err != nil {
 			return nil, nil, err
 		}
-		profile, err := io.ReadAll(io.LimitReader(contextInput{ReadCloser: reader, context: ctx}, profileLimit+1))
+		profile, err := io.ReadAll(io.LimitReader(contextInput{ReadCloser: reader, ctx: ctx}, profileLimit+1))
 		closeErr := reader.Close()
 		if err != nil {
 			return nil, nil, err
@@ -249,7 +249,7 @@ func jpegColorProfile(ctx context.Context, data []byte, model color.Model) ([]by
 	return profile, nil
 }
 
-// jpegDisplayImage 统一JPEG显示变换，保留源分量并使用文档内嵌ICC
+// jpegDisplayImage 统一JPEG显示变换，保留源分量并精确复用相邻同色的ICC结果
 // 入参: ctx 取消上下文, source 源像素, profile 颜色配置，可为nil
 // 返回: image.Image 显示像素, error 变换或取消错误
 func jpegDisplayImage(ctx context.Context, source image.Image, profile *pdfgo.ColorSpace) (image.Image, error) {
@@ -265,6 +265,12 @@ func jpegDisplayImage(ctx context.Context, source image.Image, profile *pdfgo.Co
 		return nil, fmt.Errorf("JPEG color image dimensions exceed capacity")
 	}
 	pixels := image.NewNRGBA64(bounds)
+	var intent pdfgo.Name
+	if profile != nil {
+		intent = profile.DefaultIntent()
+	}
+	var previous color.CMYK
+	var previousPixel color.NRGBA64
 	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
 		for x := bounds.Min.X; x < bounds.Max.X; x++ {
 			if (x-bounds.Min.X)&255 == 0 {
@@ -283,12 +289,18 @@ func jpegDisplayImage(ctx context.Context, source image.Image, profile *pdfgo.Co
 				})
 				continue
 			}
+			if previousPixel.A != 0 && ink == previous {
+				pixels.SetNRGBA64(x, y, previousPixel)
+				continue
+			}
 			values := [4]float64{float64(ink.C) / 255, float64(ink.M) / 255, float64(ink.Y) / 255, float64(ink.K) / 255}
-			rgb, err := profile.SRGB(values[:], profile.DefaultIntent())
+			rgb, err := profile.SRGB(values[:], intent)
 			if err != nil {
 				return nil, err
 			}
-			pixels.SetNRGBA64(x, y, color.NRGBA64{R: colorWord(rgb[0]), G: colorWord(rgb[1]), B: colorWord(rgb[2]), A: 65535})
+			previous = ink
+			previousPixel = color.NRGBA64{R: colorWord(rgb[0]), G: colorWord(rgb[1]), B: colorWord(rgb[2]), A: 65535}
+			pixels.SetNRGBA64(x, y, previousPixel)
 		}
 	}
 	return &colorImage{NRGBA64: pixels, source: source}, nil

internal/base/image/encoded.go

@@ -139,7 +139,7 @@ func (img *EncodedImage) decodeContext(ctx context.Context, pending chan struct{
 		close(pending)
 		img.mu.Unlock()
 	}()
-	pixels, _, err := image.Decode(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(img.data)), context: ctx})
+	pixels, _, err := image.Decode(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(img.data)), ctx: ctx})
 	if err == nil && (img.format == "jpeg" || img.profile != nil) {
 		var profile *pdfgo.ColorSpace
 		if img.profile != nil {
@@ -184,7 +184,7 @@ func newEncodedImage(data []byte) (*EncodedImage, error) {
 // 入参: ctx 取消上下文, data 只读图片编码
 // 返回: *EncodedImage 惰性图片, error 头信息、格式或取消错误
 func newEncodedImageContext(ctx context.Context, data []byte) (*EncodedImage, error) {
-	config, format, err := image.DecodeConfig(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
+	config, format, err := image.DecodeConfig(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), ctx: ctx})
 	if cancelErr := ctx.Err(); cancelErr != nil {
 		return nil, cancelErr
 	}

internal/base/image/image.go

@@ -170,7 +170,7 @@ func DecodeContext(ctx context.Context, data []byte) (img image.Image, format st
 		img, err := DecodeTIFF(ctx, data, layout)
 		return img, "tiff", err
 	}
-	img, format, err = image.Decode(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
+	img, format, err = image.Decode(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), ctx: ctx})
 	if err == nil {
 		return img, NormalizeFormat(format), nil
 	}
@@ -267,7 +267,7 @@ func DecodeConfigDataContext(ctx context.Context, data []byte) (config image.Con
 		cfg.Width, cfg.Height = size.X, size.Y
 		return cfg, "tiff", nil
 	}
-	cfg, format, err := image.DecodeConfig(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
+	cfg, format, err := image.DecodeConfig(contextInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), ctx: ctx})
 	if err == nil {
 		return cfg, NormalizeFormat(format), nil
 	}
@@ -451,13 +451,11 @@ func GrayAt(img image.Image, x, y int) color.Gray {
 	case *colorImage:
 		return GrayAt(src.source, x, y)
 	case *maskedTIFFImage:
-		if src.NRGBA64At(x, y).A == 0 {
+		if src.alphaAt(x, y) == 0 {
 			return color.Gray{}
 		}
-		bounds, size := src.source.Bounds(), src.bounds.Size()
+		point := src.samplePoint(src.source.Bounds(), x, y)
-		sx := bounds.Min.X + int((uint64(x-src.bounds.Min.X)*uint64(bounds.Dx())+uint64(bounds.Dx()/2))/uint64(size.X))
+		return GrayAt(src.source, point.X, point.Y)
-		sy := bounds.Min.Y + int((uint64(y-src.bounds.Min.Y)*uint64(bounds.Dy())+uint64(bounds.Dy()/2))/uint64(size.Y))
-		return GrayAt(src.source, sx, sy)
 	case *transparentEdgeImage:
 		if x <= src.rect.Min.X || y <= src.rect.Min.Y || x >= src.rect.Max.X-1 || y >= src.rect.Max.Y-1 {
 			return color.Gray{}
@@ -534,6 +532,39 @@ func NRGBAAt(img image.Image, x, y int) color.NRGBA {
 // 返回: uint32 十六位透明度
 func AlphaAt(img image.Image, x, y int) uint32 {
 	switch source := img.(type) {
+	case *maskedTIFFImage:
+		return source.alphaAt(x, y)
+	case *image.YCbCr, *image.CMYK, *image.Gray, *image.Gray16:
+		return 65535
+	case *image.NYCbCrA:
+		if !image.Pt(x, y).In(source.Rect) {
+			return 0
+		}
+		return uint32(source.A[source.AOffset(x, y)]) * 257
+	case *orientedTIFFImage:
+		point, ok := source.sourcePoint(x, y)
+		if !ok {
+			return 0
+		}
+		return AlphaAt(source.source, point.X, point.Y)
+	case *planarTIFFImage:
+		if !image.Pt(x, y).In(source.bounds) {
+			return 0
+		}
+		if source.alpha != 0 {
+			index := 3
+			if source.cmyk {
+				index = 4
+			} else if source.gray || len(source.palette) != 0 {
+				index = 1
+			}
+			return uint32(source.sampleAt(index, x, y))
+		}
+		if len(source.palette) != 0 {
+			index := uint32(source.sampleAt(0, x, y)) * uint32(len(source.palette)-1) / 65535
+			return uint32(source.palette[index].A)
+		}
+		return 65535
 	case *image.RGBA:
 		if !(image.Point{X: x, Y: y}).In(source.Rect) {
 			return 0
@@ -722,6 +753,7 @@ func WithTransparentEdge(ctx context.Context, img image.Image) (image.Image, int
 	hasZero, hasVisible := false, false
 	var pixels []byte
 	var stride, step int
+	wideAlpha := false
 	switch src := source.(type) {
 	case *image.NRGBA:
 		pixels, stride, step = src.Pix, src.Stride, 4
@@ -729,9 +761,17 @@ func WithTransparentEdge(ctx context.Context, img image.Image) (image.Image, int
 		pixels, stride, step = src.Pix, src.Stride, 4
 	case *image.Alpha:
 		pixels, stride, step = src.Pix, src.Stride, 1
+	case *image.NRGBA64:
+		pixels, stride, step, wideAlpha = src.Pix, src.Stride, 8, true
+	case *image.RGBA64:
+		pixels, stride, step, wideAlpha = src.Pix, src.Stride, 8, true
+	case *image.Alpha16:
+		pixels, stride, step, wideAlpha = src.Pix, src.Stride, 2, true
+	case *colorImage:
+		pixels, stride, step, wideAlpha = src.Pix, src.Stride, 8, true
 	}
 	if pixels != nil {
-		hasZero = pixels[step-1] == 0
+		hasZero = pixels[step-1] == 0 && (!wideAlpha || pixels[step-2] == 0)
 		hasVisible = !hasZero
 	scan:
 		for y := 0; y < h; y++ {
@@ -745,7 +785,7 @@ func WithTransparentEdge(ctx context.Context, img image.Image) (image.Image, int
 						return nil, 0, err
 					}
 				}
-				if (pixels[offset] == 0) != hasZero {
+				if (pixels[offset] == 0 && (!wideAlpha || pixels[offset-1] == 0)) != hasZero {
 					hasZero, hasVisible = true, true
 					break scan
 				}

internal/base/image/input.go

@@ -22,14 +22,14 @@ import (
 // contextInput 在读取图像编码时检查调用方取消状态
 type contextInput struct {
 	io.ReadCloser
-	context context.Context
+	ctx context.Context
 }
 
 // Read 检查取消状态后读取原始数据
 // 入参: data 数据缓冲区
 // 返回: int 读取字节数, error 读取或取消错误
 func (r contextInput) Read(data []byte) (int, error) {
-	if err := r.context.Err(); err != nil {
+	if err := r.ctx.Err(); err != nil {
 		return 0, err
 	}
 	return r.ReadCloser.Read(data)

internal/base/image/scale.go

@@ -56,7 +56,7 @@ func (s rasterImageSource) RGBA64At(x, y int) color.RGBA64 {
 	return color.RGBA64{R: uint16(r), G: uint16(g), B: uint16(b), A: uint16(a)}
 }
 
-// drawRasterAxisImage 按像素中心进行轴向缩放，逐行复用横向采样并保留镜像与小数坐标
+// drawRasterAxisImage 轴向缩放复用逐行采样，细轴按面积覆盖并保留镜像与小数坐标
 // 入参: dst 目标图像, src 源图像, m 像素变换, op 合成操作
 // 返回: bool 是否使用轴向采样
 func drawRasterAxisImage(dst draw.Image, src image.Image, m [6]float64, op draw.Op) bool {
@@ -78,8 +78,14 @@ func drawRasterAxisImage(dst draw.Image, src image.Image, m [6]float64, op draw.
 		return true
 	}
 	if float64(r.Dx())*math.Min(float64(r.Dy()), math.Ceil(4*math.Max(1, sy))+2) > rasterScaleBufferLimit/32 {
+		if sx*float64(b.Dx()) < 1 || sy*float64(b.Dy()) < 1 {
+			return drawRasterFootprintImage(dst, src, m, op, r)
+		}
 		return false
 	}
+	if !rasterFootprintWeightsFit(b, r, m) {
+		return drawRasterFootprintImage(dst, src, m, op, r)
+	}
 	xs := rasterImageAxis(r.Min.X, r.Max.X, b.Min.X, b.Max.X, m[0], m[4])
 	ys := rasterImageAxis(r.Min.Y, r.Max.Y, b.Min.Y, b.Max.Y, m[3], m[5])
 	if len(xs) == 0 || len(ys) == 0 {
@@ -139,10 +145,13 @@ func drawRasterAxisImage(dst draw.Image, src image.Image, m [6]float64, op draw.
 	return true
 }
 
-// rasterImageAxis 按连续源坐标生成CatmullRom权重，不对图像几何边界取整
+// rasterImageAxis 按连续源坐标生成CatmullRom权重，亚像素细轴使用面积覆盖权重
 // 入参: first 目标起点, end 目标终点, source 源起点, limit 源终点, scale 缩放比例, offset 平移距离
 // 返回: []rasterAxisSample 轴向采样表
 func rasterImageAxis(first, end, source, limit int, scale, offset float64) []rasterAxisSample {
+	if math.Abs(scale)*float64(limit-source) < 1 {
+		return rasterImageFootprintAxis(first, end, source, limit, scale, offset)
+	}
 	result := make([]rasterAxisSample, 0, end-first)
 	argument := math.Min(1, math.Abs(scale))
 	support := draw.CatmullRom.Support / argument
@@ -183,17 +192,150 @@ func rasterImageAxis(first, end, source, limit int, scale, offset float64) []ras
 	return result
 }
 
+// rasterFootprintWeightsFit 检查细轴权重表的合计预算，乘法前排除溢出
+// 入参: source 源边界, target 目标范围, m 像素变换
+// 返回: bool 权重表是否符合预算
+func rasterFootprintWeightsFit(source, target image.Rectangle, m [6]float64) bool {
+	budget := rasterScaleBufferLimit / 8
+	for _, axis := range [...]struct {
+		source, target int
+		scale          float64
+	}{{source.Dx(), target.Dx(), m[0]}, {source.Dy(), target.Dy(), m[3]}} {
+		if math.Abs(axis.scale)*float64(axis.source) < 1 && axis.target > 0 {
+			n, samples := axis.source, min(2, axis.target)
+			if n > budget/samples {
+				return false
+			}
+			budget -= n * samples
+		}
+	}
+	return true
+}
+
+// rasterImageWeightSpan 提供单个目标像素的源范围和权重，不分配整轴权重表
+// 入参: pixel 目标像素, source 源起点, limit 源终点, scale 缩放比例, offset 平移距离
+// 返回: int 源起点, int 源终点, func(int)float64 源权重
+func rasterImageWeightSpan(pixel, source, limit int, scale, offset float64) (int, int, func(int) float64) {
+	if math.Abs(scale)*float64(limit-source) < 1 {
+		left, right := (float64(pixel)-offset)/scale, (float64(pixel+1)-offset)/scale
+		if right < left {
+			left, right = right, left
+		}
+		if right <= float64(source) || left >= float64(limit) {
+			return 0, 0, nil
+		}
+		return source, limit, func(x int) float64 {
+			return math.Max(0, math.Min(float64(x)+1, right)-math.Max(float64(x), left)) * math.Abs(scale)
+		}
+	}
+	center := (float64(pixel) + .5 - offset) / scale
+	if center < float64(source) || center >= float64(limit) {
+		return 0, 0, nil
+	}
+	center -= .5
+	argument := math.Min(1, math.Abs(scale))
+	support := draw.CatmullRom.Support / argument
+	start := int(max(float64(source), math.Floor(center-support)))
+	stop := int(min(float64(limit), math.Ceil(center+support)))
+	weight := func(x int) float64 {
+		distance := math.Abs((float64(x) - center) * argument)
+		if distance < draw.CatmullRom.Support {
+			return draw.CatmullRom.At(distance)
+		}
+		return 0
+	}
+	var total float64
+	for x := start; x < stop; x++ {
+		total += weight(x)
+	}
+	return start, stop, func(x int) float64 { return weight(x) / total }
+}
+
+// drawRasterFootprintImage 在细轴权重超预算时按原累加顺序逐点绘制
+// 入参: dst 目标图像, src 源图像, m 像素变换, op 合成操作, target 目标范围
+// 返回: bool 是否完成绘制
+func drawRasterFootprintImage(dst draw.Image, src image.Image, m [6]float64, op draw.Op, target image.Rectangle) bool {
+	pixels, ok := src.(image.RGBA64Image)
+	if !ok {
+		pixels = rasterImageSource{src}
+	}
+	b := src.Bounds()
+	output := image.NewRGBA64(image.Rect(0, 0, 1, 1))
+	var value [1]rasterImagePixel
+	for y := target.Min.Y; y < target.Max.Y; y++ {
+		firstY, endY, wy := rasterImageWeightSpan(y, b.Min.Y, b.Max.Y, m[3], m[5])
+		if firstY == endY {
+			continue
+		}
+		for x := target.Min.X; x < target.Max.X; x++ {
+			firstX, endX, wx := rasterImageWeightSpan(x, b.Min.X, b.Max.X, m[0], m[4])
+			if firstX == endX {
+				continue
+			}
+			value[0] = rasterImagePixel{}
+			for sy := firstY; sy < endY; sy++ {
+				var row rasterImagePixel
+				for sx := firstX; sx < endX; sx++ {
+					p, weight := pixels.RGBA64At(sx, sy), wx(sx)
+					if weight != 0 {
+						row.r += float64(p.R) * weight
+						row.g += float64(p.G) * weight
+						row.b += float64(p.B) * weight
+						row.a += float64(p.A) * weight
+					}
+				}
+				if weight := wy(sy); weight != 0 {
+					value[0].r += row.r * weight
+					value[0].g += row.g * weight
+					value[0].b += row.b * weight
+					value[0].a += row.a * weight
+				}
+			}
+			rasterImageWriteRow(dst, output, value[:], x, y, op)
+		}
+	}
+	return true
+}
+
+// rasterImageFootprintAxis 对不足一个目标像素的整轴保留真实交叠面积及预乘透明度
+// 入参: first 目标起点, end 目标终点, source 源起点, limit 源终点, scale 缩放比例, offset 平移距离
+// 返回: []rasterAxisSample 轴向覆盖权重
+func rasterImageFootprintAxis(first, end, source, limit int, scale, offset float64) []rasterAxisSample {
+	lo, hi := float64(source)*scale+offset, float64(limit)*scale+offset
+	if hi < lo {
+		lo, hi = hi, lo
+	}
+	result := make([]rasterAxisSample, 0, min(2, end-first))
+	for pixel := first; pixel < end; pixel++ {
+		if math.Min(float64(pixel+1), hi) > math.Max(float64(pixel), lo) {
+			result = append(result, rasterAxisSample{pixel: pixel, first: source})
+		}
+	}
+	buffer := make([]float64, len(result)*(limit-source))
+	for index := range result {
+		sample := &result[index]
+		left, right := (float64(sample.pixel)-offset)/scale, (float64(sample.pixel+1)-offset)/scale
+		if right < left {
+			left, right = right, left
+		}
+		n := limit - source
+		sample.weights, buffer = buffer[:n:n], buffer[n:]
+		for i := range sample.weights {
+			x := float64(source + i)
+			sample.weights[i] = math.Max(0, math.Min(x+1, right)-math.Max(x, left)) * math.Abs(scale)
+		}
+	}
+	return result
+}
+
 // rasterImageHorizontal 按源列复用像素，保留各目标像素的权重累加顺序与中间精度
 // 入参: row 横向缓冲, src 源像素, samples 采样表, y 源行坐标
 func rasterImageHorizontal(row []rasterImagePixel, src image.RGBA64Image, samples []rasterAxisSample, y int) {
 	clear(row)
 	first, last := samples[0], samples[len(samples)-1]
 	reversed := first.first > last.first || first.first == last.first && len(first.weights) > len(last.weights)
-	start, end := samples[0].first, samples[0].first+len(samples[0].weights)
+	start := min(first.first, last.first)
-	for _, sample := range samples[1:] {
+	end := max(first.first+len(first.weights), last.first+len(last.weights))
-		start = min(start, sample.first)
-		end = max(end, sample.first+len(sample.weights))
-	}
 	active, next := 0, 0
 	for x := start; x < end; x++ {
 		for next < len(samples) {
@@ -217,6 +359,7 @@ func rasterImageHorizontal(row []rasterImagePixel, src image.RGBA64Image, sample
 			active++
 		}
 		p := src.RGBA64At(x, y)
+		r, g, b, a := float64(p.R), float64(p.G), float64(p.B), float64(p.A)
 		for column := active; column < next; column++ {
 			index := column
 			if reversed {
@@ -226,10 +369,10 @@ func rasterImageHorizontal(row []rasterImagePixel, src image.RGBA64Image, sample
 			weight := sample.weights[x-sample.first]
 			if weight != 0 {
 				value := &row[index]
-				value.r += float64(p.R) * weight
+				value.r += r * weight
-				value.g += float64(p.G) * weight
+				value.g += g * weight
-				value.b += float64(p.B) * weight
+				value.b += b * weight
-				value.a += float64(p.A) * weight
+				value.a += a * weight
 			}
 		}
 	}

internal/base/image/storage.go

@@ -42,10 +42,14 @@ func StorageCost(img image.Image, limit int) int {
 		}
 		cost += cap(encoded.profile)
 		if encoded.profile != nil || encoded.pngColor != nil || encoded.config.ColorModel == color.CMYKModel {
-			if w > (limit-cost)/12/h {
+			pixelSize := 12
+			if encoded.config.ColorModel == color.RGBA64Model || encoded.config.ColorModel == color.NRGBA64Model {
+				pixelSize = 16
+			}
+			if w > (limit-cost)/pixelSize/h {
 				return limit + 1
 			}
-			pixels = w * h * 12
+			pixels = w * h * pixelSize
 		}
 		if result := encoded.result.Load(); result != nil && result.image != nil {
 			pixels = max(pixels, StorageCost(result.image, limit-cost))

internal/base/image/tiff.go

@@ -165,7 +165,7 @@ func readTIFFDirectory(ctx context.Context, input io.Reader, order binary.ByteOr
 		if offset < position {
 			return result, position, ErrTIFFRandomAccess
 		}
-		reader := contextInput{ReadCloser: io.NopCloser(input), context: ctx}
+		reader := contextInput{ReadCloser: io.NopCloser(input), ctx: ctx}
 		if _, err := io.CopyN(io.Discard, reader, offset-position); err != nil {
 			return result, position, err
 		}

internal/base/image/tiff_mask.go

@@ -49,6 +49,36 @@ func (s *maskedTIFFImage) Bounds() image.Rectangle { return s.bounds }
 // 返回: color.Model 颜色模型
 func (s *maskedTIFFImage) ColorModel() color.Model { return color.NRGBA64Model }
 
+// samplePoint 将显示坐标映射到主图或蒙版的像素中心
+// 入参: bounds 采样图像范围, x 横坐标, y 纵坐标
+// 返回: image.Point 采样坐标
+func (s *maskedTIFFImage) samplePoint(bounds image.Rectangle, x, y int) image.Point {
+	size := s.bounds.Size()
+	x, y = x-s.bounds.Min.X, y-s.bounds.Min.Y
+	if bounds.Size() == size {
+		return bounds.Min.Add(image.Pt(x, y))
+	}
+	return image.Pt(
+		bounds.Min.X+int((uint64(x)*uint64(bounds.Dx())+uint64(bounds.Dx()/2))/uint64(size.X)),
+		bounds.Min.Y+int((uint64(y)*uint64(bounds.Dy())+uint64(bounds.Dy()/2))/uint64(size.Y)),
+	)
+}
+
+// alphaAt 读取蒙版与主图透明度，不解算主图颜色
+// 入参: x 横坐标, y 纵坐标
+// 返回: uint32 十六位透明度
+func (s *maskedTIFFImage) alphaAt(x, y int) uint32 {
+	if !image.Pt(x, y).In(s.bounds) {
+		return 0
+	}
+	mask := s.samplePoint(s.mask.Bounds(), x, y)
+	if NRGBA64At(s.mask, mask.X, mask.Y).R == 0 {
+		return 0
+	}
+	source := s.samplePoint(s.source.Bounds(), x, y)
+	return AlphaAt(s.source, source.X, source.Y)
+}
+
 // NRGBA64At 按像素中心读取主图及蒙版，零位隐藏原图并保留隐藏颜色
 // 入参: x 横坐标, y 纵坐标
 // 返回: color.NRGBA64 非预乘十六位颜色
@@ -56,16 +86,10 @@ func (s *maskedTIFFImage) NRGBA64At(x, y int) color.NRGBA64 {
 	if !image.Pt(x, y).In(s.bounds) {
 		return color.NRGBA64{}
 	}
-	size := s.bounds.Size()
+	source := s.samplePoint(s.source.Bounds(), x, y)
-	x, y = x-s.bounds.Min.X, y-s.bounds.Min.Y
+	pixel := NRGBA64At(s.source, source.X, source.Y)
-	b := s.source.Bounds()
+	mask := s.samplePoint(s.mask.Bounds(), x, y)
-	sx := b.Min.X + int((uint64(x)*uint64(b.Dx())+uint64(b.Dx()/2))/uint64(size.X))
+	if NRGBA64At(s.mask, mask.X, mask.Y).R == 0 {
-	sy := b.Min.Y + int((uint64(y)*uint64(b.Dy())+uint64(b.Dy()/2))/uint64(size.Y))
-	pixel := NRGBA64At(s.source, sx, sy)
-	b = s.mask.Bounds()
-	mx := b.Min.X + int((uint64(x)*uint64(b.Dx())+uint64(b.Dx()/2))/uint64(size.X))
-	my := b.Min.Y + int((uint64(y)*uint64(b.Dy())+uint64(b.Dy()/2))/uint64(size.Y))
-	if NRGBA64At(s.mask, mx, my).R == 0 {
 		pixel.A = 0
 	}
 	return pixel

internal/base/image/tiff_profile.go

@@ -99,11 +99,11 @@ func applyImageColorProfile(ctx context.Context, source image.Image, profile *pd
 	model := source.ColorModel()
 	premultiplied := model == color.RGBAModel || model == color.RGBA64Model
 	table := newTIFFProfileTable(source)
+	components, intent := profile.Components(), profile.DefaultIntent()
 	result := image.NewNRGBA64(bounds)
 	var previous [4]float64
 	var previousPixel color.NRGBA64
 	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
-		misses := 0
 		for x := bounds.Min.X; x < bounds.Max.X; x++ {
 			if (x-bounds.Min.X)&255 == 0 {
 				if err := ctx.Err(); err != nil {
@@ -154,17 +154,13 @@ func applyImageColorProfile(ctx context.Context, source image.Image, profile *pd
 				alpha = pixel.A
 				values = [4]float64{float64(pixel.R) / 65535, float64(pixel.G) / 65535, float64(pixel.B) / 65535}
 			}
-			if misses < 32 {
 			if previousPixel.A != 0 && values == previous {
 				pixel := previousPixel
 				pixel.A = alpha
 				result.SetNRGBA64(x, y, pixel)
-					misses = 0
 				continue
 			}
 			previous = values
-				misses++
-			}
 			if linearSRGB {
 				for i := range 3 {
 					if values[i] <= 0.04045 {
@@ -174,7 +170,7 @@ func applyImageColorProfile(ctx context.Context, source image.Image, profile *pd
 					}
 				}
 			}
-			rgb, err := profile.SRGB(values[:profile.Components()], profile.DefaultIntent())
+			rgb, err := profile.SRGB(values[:components], intent)
 			if err != nil {
 				return nil, err
 			}
@@ -182,11 +178,7 @@ func applyImageColorProfile(ctx context.Context, source image.Image, profile *pd
 			for i, value := range rgb {
 				channels[i] = uint16(math.Round(max(0, min(1, value)) * 65535))
 			}
-			if misses < 32 {
 			previousPixel = color.NRGBA64{R: channels[0], G: channels[1], B: channels[2], A: 65535}
-			} else {
-				previousPixel.A = 0
-			}
 			if slot >= 0 {
 				table[slot] = color.NRGBA64{R: channels[0], G: channels[1], B: channels[2], A: 65535}
 			}

internal/base/threed/u3d_lineset.go

@@ -211,11 +211,11 @@ func (s *u3dLineState) accumulateCorners(mesh *U3DMesh, shadingIndex uint32, cor
 }
 
 // value 按指定上下文和位宽读取点集或线集字段
-// 入参: context 压缩上下文, small 是否为8位字段
+// 入参: ctx 压缩上下文, small 是否为8位字段
 // 返回: uint32 字段值
-func (r *u3dLineReader) value(context int, small bool) uint32 {
+func (r *u3dLineReader) value(ctx int, small bool) uint32 {
 	if r.bits != nil {
-		return r.bits.dynamicValue(&r.hist[context], small)
+		return r.bits.dynamicValue(&r.hist[ctx], small)
 	}
 	if small {
 		return uint32(r.values.u8())

internal/base/threed/u3d_motion.go

@@ -167,15 +167,15 @@ func (r *u3dResourceReader) motionFrame(frame *U3DKeyFrame, previous U3DKeyFrame
 }
 
 // motionDifference 用共享幅值上下文恢复一至三个差分分量
-// 入参: previous 前一帧分量, scale 逆量化系数, context 符号上下文，下一项为幅值上下文
+// 入参: previous 前一帧分量, scale 逆量化系数, ctx 符号上下文，下一项为幅值上下文
 // 返回: [3]float32 重建分量, error 符号、数值或读取错误
-func (r *u3dResourceReader) motionDifference(previous []float32, scale float32, context int) (values [3]float32, err error) {
+func (r *u3dResourceReader) motionDifference(previous []float32, scale float32, ctx int) (values [3]float32, err error) {
-	signs := r.value(context, true)
+	signs := r.value(ctx, true)
 	if signs >= 1<<len(previous) {
 		return values, fmt.Errorf("invalid U3D motion difference signs")
 	}
 	for index, prior := range previous {
-		difference := float64(r.value(context+1, false)) * float64(scale)
+		difference := float64(r.value(ctx+1, false)) * float64(scale)
 		if signs&(1<<index) != 0 {
 			difference = -difference
 		}

internal/base/threed/u3d_resource_reader.go

@@ -30,9 +30,9 @@ type u3dResourceReader struct {
 }
 
 // value 读取指定上下文的压缩字段，首次使用时初始化算术区间
-// 入参: context 压缩上下文, small 是否为8位字段
+// 入参: ctx 压缩上下文, small 是否为8位字段
 // 返回: uint32 字段值
-func (r *u3dResourceReader) value(context int, small bool) uint32 {
+func (r *u3dResourceReader) value(ctx int, small bool) uint32 {
 	if r.err() != nil {
 		return 0
 	}
@@ -52,7 +52,7 @@ func (r *u3dResourceReader) value(context int, small bool) uint32 {
 			return nil
 		}
 	}
-	return r.bits.dynamicValue(&r.hist[context], small)
+	return r.bits.dynamicValue(&r.hist[ctx], small)
 }
 
 // u32 读取普通32位字段，压缩开始后沿用当前算术区间

internal/build/build.go

@@ -0,0 +1,17 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package build
+
+var Version string

internal/codec/pdf/color.go

@@ -340,3 +340,18 @@ func PaintChannels(values [4]float64, compatible bool, marked *[4]bool) [4]bool
 	}
 	return channels
 }
+
+// OpaqueBlack 判断不受底层分色影响的全黑设备色
+// 入参: paint PDF颜色与不透明度
+// 返回: bool 是否为不透明全黑CMYK颜色
+func OpaqueBlack(paint pdfgo.Paint) bool {
+	return paint.Alpha == 1 && paint.CMYK != nil && paint.CMYK[3] == 1
+}
+
+// OverprintNeedsSeparation 判断彩色CMYK套印是否依赖分色输出
+// 入参: paint PDF颜色与不透明度
+// 返回: bool 是否需要保留分色语义
+func OverprintNeedsSeparation(paint pdfgo.Paint) bool {
+	_, process := paint.Process.CMYKMask()
+	return (paint.CMYK != nil || process) && !OpaqueBlack(paint)
+}

internal/codec/pdf/export.go

@@ -31,10 +31,11 @@ type TextPage struct {
 	Replacements []pdfgo.TextReplacement
 }
 
-// WriteOptions 保存PDF最终写出所需的像素、文字和导航修正
+// WriteOptions 保存PDF最终写出所需的元数据、像素、文字和导航修正
 // Images逐页记录绘制图像，nil图像表示不替换；Links保留全部链接位置，包括矩形区域的nil项
 // PrepareRewrite在页面引用确定后填充导航动作，不得提前写出PDF
 type WriteOptions struct {
+	Information    pdfgo.Dictionary
 	Images         [][]image.Image
 	Text           []TextPage
 	Links          map[int][]*pdfgo.LinkRegion
@@ -49,7 +50,7 @@ type WriteOptions struct {
 // 返回: error 资源、压缩或写入错误
 func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOptions) error {
 	nativeWrite := settings.PrepareRewrite != nil
-	if !settings.ExactImages && !settings.ExactText && !nativeWrite && settings.Optimization.Compression.Mode == pdfgo.CompressionUnchanged {
+	if !settings.ExactImages && !settings.ExactText && !nativeWrite && len(settings.Information) == 0 && settings.Optimization.Compression.Mode == pdfgo.CompressionUnchanged {
 		if err := ctx.Err(); err != nil {
 			return err
 		}
@@ -65,6 +66,10 @@ func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOpt
 	}
 	defer reader.Close()
 	if !settings.ExactImages && !settings.ExactText && !nativeWrite {
+		if len(settings.Information) != 0 {
+			_, err := reader.RewriteTo(ctx, writer, pdfgo.RewriteOptions{Information: settings.Information, Optimization: settings.Optimization})
+			return err
+		}
 		_, err := reader.OptimizeTo(ctx, writer, settings.Optimization)
 		return err
 	}
@@ -171,7 +176,7 @@ func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOpt
 	if pages != len(settings.Images) {
 		return fmt.Errorf("PDF output page missing")
 	}
-	options := pdfgo.RewriteOptions{Images: images, ImageOptions: pdfgo.ImageWriteOptions{PreblendBinary: true}, LinkRegions: links, TextReplacements: texts, Optimization: settings.Optimization}
+	options := pdfgo.RewriteOptions{Information: settings.Information, Images: images, ImageOptions: pdfgo.ImageWriteOptions{PreblendBinary: true}, LinkRegions: links, TextReplacements: texts, Optimization: settings.Optimization}
 	if nativeWrite {
 		if err := settings.PrepareRewrite(ctx, reader, references, &options); err != nil {
 			return err

internal/codec/pdf/geometry.go

@@ -17,6 +17,8 @@ package pdf
 import (
 	"context"
 	"fmt"
+	"math"
+	"strconv"
 
 	basegeom "github.com/xiaoqidun/ofdgo/internal/base/geom"
 	"github.com/xiaoqidun/pdfgo"
@@ -99,3 +101,67 @@ func GlyphPath(outline basegeom.Path, matrix pdfgo.Matrix) (pdfgo.Path, error) {
 	}
 	return path, nil
 }
+
+// PathBounds 逐段计算变换后的控制点边界，不创建临时点集合
+// 入参: ctx 取消上下文, path PDF路径, matrix 坐标变换
+// 返回: basegeom.Box 控制点边界，空路径返回零值, error 取消错误
+func PathBounds(ctx context.Context, path pdfgo.Path, matrix pdfgo.Matrix) (basegeom.Box, error) {
+	if err := ctx.Err(); err != nil {
+		return basegeom.Box{}, err
+	}
+	minX, minY, maxX, maxY := math.Inf(1), math.Inf(1), math.Inf(-1), math.Inf(-1)
+	found := false
+	for _, segment := range path.Segments {
+		if err := ctx.Err(); err != nil {
+			return basegeom.Box{}, err
+		}
+		for index, point := range segment.Points {
+			if index&255 == 0 {
+				if err := ctx.Err(); err != nil {
+					return basegeom.Box{}, err
+				}
+			}
+			point = matrix.Apply(point)
+			minX, minY = math.Min(minX, point.X), math.Min(minY, point.Y)
+			maxX, maxY = math.Max(maxX, point.X), math.Max(maxY, point.Y)
+			found = true
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return basegeom.Box{}, err
+	}
+	if !found {
+		return basegeom.Box{}, nil
+	}
+	return basegeom.Box{X: minX, Y: minY, W: math.Max(maxX-minX, 1e-6), H: math.Max(maxY-minY, 1e-6)}, nil
+}
+
+// PathData 转换路径并在分段处理时检查取消
+// 入参: ctx 取消上下文, path PDF路径, matrix 坐标变换, origin 对象边界
+// 返回: string OFD路径数据, error 取消错误
+func PathData(ctx context.Context, path pdfgo.Path, matrix pdfgo.Matrix, origin basegeom.Box) (string, error) {
+	if err := ctx.Err(); err != nil {
+		return "", err
+	}
+	data := make([]byte, 0, len(path.Segments)*48)
+	for index, segment := range path.Segments {
+		if err := ctx.Err(); err != nil {
+			return "", err
+		}
+		if index != 0 {
+			data = append(data, ' ')
+		}
+		data = append(data, segment.Operator...)
+		for _, point := range segment.Points {
+			point = matrix.Apply(point)
+			data = append(data, ' ')
+			data = strconv.AppendFloat(data, point.X-origin.X, 'g', -1, 64)
+			data = append(data, ' ')
+			data = strconv.AppendFloat(data, point.Y-origin.Y, 'g', -1, 64)
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return "", err
+	}
+	return string(data), nil
+}

internal/codec/pdf/image.go

@@ -28,6 +28,18 @@ import (
 	"github.com/xiaoqidun/pdfgo"
 )
 
+// StencilImage 按当前填充色读取模板图像，不分配整幅彩色样本
+type StencilImage struct {
+	Source image.Image
+	Fill   color.NRGBA64
+}
+
+// NativeImage 按源像素输出原生过程色，不分配完整显示颜色缓冲
+type NativeImage struct {
+	Source *pdfgo.ImageProcess
+	Space  *pdfgo.ColorSpace
+}
+
 // EncodeCMYKTIFF 将直接四色图像保存为十六位无损TIFF，不经过显示颜色转换
 // 入参: ctx 取消上下文, source PDF源图像
 // 返回: []byte 含ICC和非预乘透明度的TIFF，非四色图像为nil, error 解码或编码错误
@@ -143,18 +155,6 @@ func EncodeCMYKTIFF(ctx context.Context, source *pdfgo.Image) ([]byte, error) {
 	return data, nil
 }
 
-// StencilImage 按当前填充色读取模板图像，不分配整幅彩色样本
-type StencilImage struct {
-	Source image.Image
-	Fill   color.NRGBA64
-}
-
-// NativeImage 按源像素输出原生过程色，不分配完整显示颜色缓冲
-type NativeImage struct {
-	Source *pdfgo.ImageProcess
-	Space  *pdfgo.ColorSpace
-}
-
 // ColorModel 保留填充色和模板的有效采样精度
 // 返回: color.Model 非预乘颜色模型
 func (s *StencilImage) ColorModel() color.Model {

internal/codec/pdf/mesh.go

@@ -0,0 +1,306 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pdf
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"slices"
+	"sync"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// meshVertex 保存局部毫米坐标及原曲面参数
+type meshVertex struct {
+	point pdfgo.Point
+	u, v  float64
+}
+
+// MeshTriangle 保存按输出精度细分的曲面网格
+type MeshTriangle struct {
+	vertices [3]meshVertex
+	patch    int
+}
+
+// meshSample 保存采样点参数，patch为一基编号，零表示未覆盖
+type meshSample struct {
+	u, v  float64
+	patch int
+}
+
+// MeshRasterOptions 保存网格采样的坐标、精度及并行配置
+// Matrix将PDF页面坐标转换为毫米，Origin为输出块的毫米原点
+type MeshRasterOptions struct {
+	Matrix        pdfgo.Matrix
+	Origin        pdfgo.Point
+	DPI           float64
+	Width, Height int
+	Workers       int
+	SoftMask      bool
+}
+
+// MeshEdge 按坐标及颜色分量匹配相邻三角形的共享边，不改变顶点顺序
+// 入参: previous 前一三角形, current 当前三角形
+// 返回: int OFD共享边标志，零表示独立三角形
+func MeshEdge(previous, current pdfgo.MeshTriangle) int {
+	if previous.Points[2] != current.Points[1] || !slices.Equal(previous.Colors[2], current.Colors[1]) {
+		return 0
+	}
+	for _, index := range [2]int{1, 0} {
+		if previous.Points[index] == current.Points[0] && slices.Equal(previous.Colors[index], current.Colors[0]) {
+			return 2 - index
+		}
+	}
+	return 0
+}
+
+// MeshTriangles 按曲面二阶导数界细分，将几何误差控制在输出像素的十六分之一内
+// 入参: ctx 取消上下文, mesh 原始曲面, matrix 页面变换, dpi 输出精度
+// 返回: []MeshTriangle 细分结果, error 取消或坐标错误
+func MeshTriangles(ctx context.Context, mesh *pdfgo.MeshGradient, matrix pdfgo.Matrix, dpi float64) ([]MeshTriangle, error) {
+	matrix = matrix.Mul(mesh.Matrix)
+	var triangles []MeshTriangle
+	for index, patch := range mesh.Patches {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		for i := range patch.Points {
+			for j := range patch.Points[i] {
+				patch.Points[i][j] = matrix.Apply(patch.Points[i][j])
+			}
+		}
+		var duu, dvv, duv float64
+		for i := 0; i < 4; i++ {
+			for j := 0; j < 4; j++ {
+				a := patch.Points[i][j]
+				if i < 2 {
+					b, c := patch.Points[i+1][j], patch.Points[i+2][j]
+					duu = math.Max(duu, 6*math.Hypot(c.X-2*b.X+a.X, c.Y-2*b.Y+a.Y))
+				}
+				if j < 2 {
+					b, c := patch.Points[i][j+1], patch.Points[i][j+2]
+					dvv = math.Max(dvv, 6*math.Hypot(c.X-2*b.X+a.X, c.Y-2*b.Y+a.Y))
+				}
+				if i < 3 && j < 3 {
+					b, c, d := patch.Points[i+1][j], patch.Points[i][j+1], patch.Points[i+1][j+1]
+					duv = math.Max(duv, 9*math.Hypot(d.X-b.X-c.X+a.X, d.Y-b.Y-c.Y+a.Y))
+				}
+			}
+		}
+		steps := math.Max(1, math.Ceil(math.Sqrt(8*(duu+dvv+2*duv)*dpi/25.4)))
+		if !finite(steps) || steps >= math.Sqrt(float64(int(^uint(0)>>1)/2)) {
+			return nil, fmt.Errorf("mesh subdivision exceeds platform integer range")
+		}
+		n := int(steps)
+		row := make([]meshVertex, n+1)
+		for i := range row {
+			if i%CompositeTileSize == 0 {
+				if err := ctx.Err(); err != nil {
+					return nil, err
+				}
+			}
+			u := float64(i) / steps
+			row[i] = meshVertex{patch.PointAt(u, 0), u, 0}
+		}
+		for j := 1; j <= n; j++ {
+			if err := ctx.Err(); err != nil {
+				return nil, err
+			}
+			v := float64(j) / steps
+			left := meshVertex{patch.PointAt(0, v), 0, v}
+			for i := 1; i <= n; i++ {
+				u := float64(i) / steps
+				right := meshVertex{patch.PointAt(u, v), u, v}
+				a, b := row[i-1], row[i]
+				triangles = append(triangles, MeshTriangle{[3]meshVertex{a, b, left}, index}, MeshTriangle{[3]meshVertex{b, right, left}, index})
+				row[i-1], left = left, right
+			}
+			row[n] = left
+		}
+	}
+	for index, triangle := range mesh.Triangles {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		vertices := [3]meshVertex{
+			{matrix.Apply(triangle.Points[0]), 0, 0},
+			{matrix.Apply(triangle.Points[1]), 1, 0},
+			{matrix.Apply(triangle.Points[2]), 0, 1},
+		}
+		triangles = append(triangles, MeshTriangle{vertices, len(mesh.Patches) + index})
+	}
+	return triangles, nil
+}
+
+// MeshPixels 对输出块执行四倍超采样，曲面重叠按后补片及较大v、u取值
+// 入参: ctx 取消上下文, mesh 原曲面, triangles 已细分网格, space 混合空间, converter 已准备的颜色转换, options 采样配置
+// 返回: []ShadingPixel 颜色及覆盖, error 几何、颜色或取消错误
+func MeshPixels(ctx context.Context, mesh *pdfgo.MeshGradient, triangles []MeshTriangle, space *pdfgo.ColorSpace, converter pdfgo.ColorConverter, options MeshRasterOptions) ([]ShadingPixel, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	const samples = 4
+	w, h := options.Width*samples, options.Height*samples
+	grid := make([]meshSample, w*h)
+	scale := options.DPI / 25.4 * samples
+	for _, triangle := range triangles {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		vertices := triangle.vertices
+		for i := range vertices {
+			vertices[i].point.X = (vertices[i].point.X - options.Origin.X) * scale
+			vertices[i].point.Y = (vertices[i].point.Y - options.Origin.Y) * scale
+		}
+		a, b, d := vertices[0].point, vertices[1].point, vertices[2].point
+		denominator := (b.Y-d.Y)*(a.X-d.X) + (d.X-b.X)*(a.Y-d.Y)
+		if denominator == 0 {
+			continue
+		}
+		minX, maxX := math.Min(a.X, math.Min(b.X, d.X)), math.Max(a.X, math.Max(b.X, d.X))
+		minY, maxY := math.Min(a.Y, math.Min(b.Y, d.Y)), math.Max(a.Y, math.Max(b.Y, d.Y))
+		if maxX < 0 || maxY < 0 || minX >= float64(w) || minY >= float64(h) {
+			continue
+		}
+		endX := int(math.Min(float64(w), math.Ceil(maxX)))
+		endY := int(math.Min(float64(h), math.Ceil(maxY)))
+		for y := int(math.Max(0, math.Floor(minY))); y < endY; y++ {
+			if err := ctx.Err(); err != nil {
+				return nil, err
+			}
+			for x := int(math.Max(0, math.Floor(minX))); x < endX; x++ {
+				px, py := float64(x)+.5, float64(y)+.5
+				l0 := ((b.Y-d.Y)*(px-d.X) + (d.X-b.X)*(py-d.Y)) / denominator
+				l1 := ((d.Y-a.Y)*(px-d.X) + (a.X-d.X)*(py-d.Y)) / denominator
+				l2 := 1 - l0 - l1
+				if l0 < -1e-10 || l1 < -1e-10 || l2 < -1e-10 {
+					continue
+				}
+				u := math.Max(0, math.Min(1, l0*vertices[0].u+l1*vertices[1].u+l2*vertices[2].u))
+				v := math.Max(0, math.Min(1, l0*vertices[0].v+l1*vertices[1].v+l2*vertices[2].v))
+				current := &grid[y*w+x]
+				if triangle.patch+1 > current.patch || triangle.patch+1 == current.patch && (v > current.v || v == current.v && u > current.u) {
+					*current = meshSample{u, v, triangle.patch + 1}
+				}
+			}
+		}
+	}
+	pixels := make([]ShadingPixel, options.Width*options.Height)
+	var background [4]float64
+	if mesh.Background != nil {
+		var err error
+		background, err = converter.Convert(mesh.Background[:mesh.Space.Components()])
+		if err != nil {
+			return nil, err
+		}
+	}
+	var inverse pdfgo.Matrix
+	if mesh.Bounds != nil {
+		var ok bool
+		inverse, ok = options.Matrix.Mul(mesh.Matrix).Inverse()
+		if !ok {
+			return nil, fmt.Errorf("singular mesh bounds transform")
+		}
+	}
+	sampleRows := func(start, end int) error {
+		colors := make(map[[4]float64][4]float64)
+		colorants := PrepareShadingColorants(pdfgo.Paint{Mesh: mesh}, space, options.SoftMask)
+		var sampler *pdfgo.MeshSampler
+		if colorants == nil {
+			sampler = mesh.NewSampler()
+		}
+		for y := start * samples; y < end*samples; y++ {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+			for x := 0; x < w; x++ {
+				if box := mesh.Bounds; box != nil {
+					point := inverse.Apply(pdfgo.Point{X: options.Origin.X + (float64(x)+.5)/scale, Y: options.Origin.Y + (float64(y)+.5)/scale})
+					if point.X < box.XMin || point.X > box.XMax || point.Y < box.YMin || point.Y > box.YMax {
+						continue
+					}
+				}
+				sample := grid[y*w+x]
+				if sample.patch == 0 && mesh.Background == nil {
+					continue
+				}
+				values := background
+				if sample.patch != 0 {
+					var err error
+					if colorants != nil {
+						values, err = colorants.MeshAt(sample.patch-1, sample.u, sample.v)
+					} else {
+						values, err = sampler.ValuesAt(sample.patch-1, sample.u, sample.v)
+					}
+					if err != nil {
+						return err
+					}
+					if cached, ok := colors[values]; ok {
+						values = cached
+					} else if colorants == nil {
+						source := values
+						values, err = converter.Convert(values[:mesh.Space.Components()])
+						if err != nil {
+							return err
+						}
+						if len(colors) == 2*CompositeTileSize {
+							clear(colors)
+						}
+						colors[source] = values
+					}
+				}
+				pixel := &pixels[(y/samples)*options.Width+x/samples]
+				for i, value := range values {
+					pixel.Values[i] += value
+				}
+				pixel.Shape++
+			}
+		}
+		return ctx.Err()
+	}
+	workers := min(max(1, options.Workers), max(1, options.Height/32))
+	if workers == 1 {
+		if err := sampleRows(0, options.Height); err != nil {
+			return nil, err
+		}
+	} else {
+		var group sync.WaitGroup
+		errors := make([]error, workers)
+		for worker := range workers {
+			group.Go(func() {
+				errors[worker] = sampleRows(worker*options.Height/workers, (worker+1)*options.Height/workers)
+			})
+		}
+		group.Wait()
+		for _, err := range errors {
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	for i := range pixels {
+		pixel := &pixels[i]
+		if pixel.Shape == 0 {
+			continue
+		}
+		for j := range pixel.Values {
+			pixel.Values[j] /= pixel.Shape
+		}
+		pixel.Shape /= samples * samples
+	}
+	return pixels, nil
+}

internal/codec/pdf/metadata.go

@@ -0,0 +1,85 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pdf
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// NormalizeDate 校验PDF日期，非严格模式修正单层外括号及完整时区偏移的分隔符
+// 入参: text PDF日期字符串, strict 是否严格校验
+// 返回: string 标准日期字符串, error 日期错误
+func NormalizeDate(text string, strict bool) (string, error) {
+	if text == "" {
+		return text, nil
+	}
+	_, err := pdfgo.ParseDate(text)
+	if err == nil || strict {
+		return text, err
+	}
+	normalized := text
+	if strings.HasPrefix(normalized, "(") && strings.HasSuffix(normalized, ")") {
+		normalized = normalized[1 : len(normalized)-1]
+		if _, parseErr := pdfgo.ParseDate(normalized); parseErr == nil {
+			return normalized, nil
+		}
+	}
+	offset := len(normalized) - 5
+	if offset < 6 || normalized[offset] != '+' && normalized[offset] != '-' {
+		return text, err
+	}
+	for _, digit := range normalized[offset+1:] {
+		if digit < '0' || digit > '9' {
+			return text, err
+		}
+	}
+	normalized = normalized[:offset+3] + "'" + normalized[offset+3:] + "'"
+	if _, parseErr := pdfgo.ParseDate(normalized); parseErr != nil {
+		return text, err
+	}
+	return normalized, nil
+}
+
+// MetadataDate 保留当地日历日期，PDF省略时区按GMT，XMP省略日或时区时不推算
+// 入参: text 来源日期, xmp 是否为XMP日期
+// 返回: time.Time 解析值, bool 是否精确到日, bool 是否可比较绝对时间, error 日期错误
+func MetadataDate(text string, xmp bool) (time.Time, bool, bool, error) {
+	if text == "" {
+		return time.Time{}, false, false, nil
+	}
+	if !xmp {
+		date, err := pdfgo.ParseDate(text)
+		return date, err == nil && date.Year() > 0, err == nil, err
+	}
+	if !strings.Contains(text, ",") {
+		for _, layout := range []string{time.RFC3339Nano, "2006-01-02T15:04Z07:00", "2006-01-02T15:04:05", "2006-01-02T15:04", "2006-01-02", "2006-01", "2006"} {
+			if date, err := time.Parse(layout, text); err == nil {
+				zoned := strings.Contains(layout, "Z07:00")
+				if zoned && !strings.HasSuffix(text, "Z") {
+					zone := text[len(text)-6:]
+					if zone[1:3] > "23" || zone[4:] > "59" {
+						return time.Time{}, false, false, fmt.Errorf("invalid XMP time zone")
+					}
+				}
+				return date, len(text) >= 10 && date.Year() > 0, zoned, nil
+			}
+		}
+	}
+	return time.Time{}, false, false, fmt.Errorf("invalid XMP date")
+}

internal/codec/pdf/print.go

@@ -0,0 +1,375 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pdf
+
+import (
+	"bytes"
+	"compress/zlib"
+	"context"
+	"encoding/hex"
+	"fmt"
+	"image"
+	"io"
+	"maps"
+	"math"
+	"slices"
+	"strconv"
+	"strings"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// PrintPlacement 保存源PDF页索引及毫米纸面上的变换和裁剪
+type PrintPlacement struct {
+	Page   int
+	Matrix [6]float64
+	Clip   [4]float64
+}
+
+// PrintSheet 保存一个纸面的物理尺寸、放置内容和辅助线
+type PrintSheet struct {
+	Width, Height  float64
+	Placements     []PrintPlacement
+	Lines          [][4]float64
+	Label          string
+	LabelX, LabelY float64
+}
+
+// printPDFObjects 写出自有打印对象，原PDF资源仅复制实际引用的部分
+type printPDFObjects struct {
+	ctx     context.Context
+	objects []pdfgo.Object
+	copied  map[pdfgo.Reference]pdfgo.Reference
+	source  *pdfgo.Reader
+}
+
+// printPDFNumbers 编码内容流数值，不使用PDF语法不接受的科学记数法
+// 入参: out 内容流缓冲区, values 待编码数值
+func printPDFNumbers(out *bytes.Buffer, values ...float64) {
+	for _, value := range values {
+		out.WriteString(strconv.FormatFloat(value, 'f', -1, 64))
+		out.WriteByte(' ')
+	}
+}
+
+// add 登记一个独立输出对象
+// 入参: object 待登记对象
+// 返回: pdfgo.Reference 输出对象引用
+func (p *printPDFObjects) add(object pdfgo.Object) pdfgo.Reference {
+	p.objects = append(p.objects, object)
+	return pdfgo.Reference{Number: int64(len(p.objects))}
+}
+
+// copy 递归复制资源并改写引用，保留流编码及资源共享
+// 入参: object 待复制对象, depth 当前递归深度
+// 返回: pdfgo.Object 改写引用后的对象, error 资源、嵌套或取消错误
+func (p *printPDFObjects) copy(object pdfgo.Object, depth int) (pdfgo.Object, error) {
+	if err := p.ctx.Err(); err != nil {
+		return nil, err
+	}
+	if depth > 256 {
+		return nil, fmt.Errorf("print PDF resource nesting too deep")
+	}
+	switch value := object.(type) {
+	case pdfgo.Reference:
+		if next, ok := p.copied[value]; ok {
+			return next, nil
+		}
+		next := p.add(nil)
+		p.copied[value] = next
+		resolved, err := p.source.Object(value)
+		if err != nil {
+			return nil, err
+		}
+		copied, err := p.copy(resolved, depth+1)
+		if err != nil {
+			return nil, err
+		}
+		p.objects[next.Number-1] = copied
+		return next, nil
+	case pdfgo.Dictionary:
+		result := make(pdfgo.Dictionary, len(value))
+		for key, item := range value {
+			copied, err := p.copy(item, depth+1)
+			if err != nil {
+				return nil, err
+			}
+			result[key] = copied
+		}
+		return result, nil
+	case pdfgo.Array:
+		result := make(pdfgo.Array, len(value))
+		for i, item := range value {
+			copied, err := p.copy(item, depth+1)
+			if err != nil {
+				return nil, err
+			}
+			result[i] = copied
+		}
+		return result, nil
+	case *pdfgo.Stream:
+		dict := maps.Clone(value.Dictionary)
+		delete(dict, "Length")
+		copied, err := p.copy(dict, depth+1)
+		if err != nil {
+			return nil, err
+		}
+		return &pdfgo.Stream{Dictionary: copied.(pdfgo.Dictionary), Data: value.Data}, nil
+	default:
+		return object, nil
+	}
+}
+
+// WritePrintPDF 将源页面作为独立表单放置，保持矢量、文字、资源及透明组
+// 入参: ctx 输出上下文, writer 输出流, source 源PDF数据, sheets 有序纸面
+// 返回: error 资源、编码、写入或取消错误
+func WritePrintPDF(ctx context.Context, writer io.Writer, source []byte, sheets []PrintSheet) error {
+	var reader *pdfgo.Reader
+	if len(source) > 0 {
+		var err error
+		reader, err = pdfgo.NewReader(bytes.NewReader(source), int64(len(source)))
+		if err != nil {
+			return err
+		}
+		defer reader.Close()
+	}
+	p := &printPDFObjects{ctx: ctx, objects: make([]pdfgo.Object, 2), copied: make(map[pdfgo.Reference]pdfgo.Reference), source: reader}
+	var pages []*pdfgo.Page
+	if reader != nil {
+		if err := reader.WalkPages(ctx, func(_ int, page *pdfgo.Page) error { pages = append(pages, page); return nil }); err != nil {
+			return err
+		}
+	}
+	forms := make(map[int]pdfgo.Reference)
+	var children pdfgo.Array
+	const pt = 72.0 / 25.4
+	for _, sheet := range sheets {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		var content bytes.Buffer
+		objects := make(pdfgo.Dictionary)
+		for _, placement := range sheet.Placements {
+			if placement.Page < 0 || placement.Page >= len(pages) {
+				return fmt.Errorf("print PDF page outside source")
+			}
+			page := pages[placement.Page]
+			if page.Rotation != 0 || page.UserUnit != 1 {
+				return fmt.Errorf("print PDF backend must normalize page rotation and units")
+			}
+			form, ok := forms[placement.Page]
+			if !ok {
+				resources, err := p.copy(page.Resources, 0)
+				if err != nil {
+					return err
+				}
+				var data bytes.Buffer
+				if _, err := page.WriteContent(ctx, &data); err != nil {
+					return err
+				}
+				box := page.MediaBox
+				dict := pdfgo.Dictionary{"Type": pdfgo.Name("XObject"), "Subtype": pdfgo.Name("Form"), "FormType": pdfgo.Integer(1), "BBox": pdfgo.Array{pdfgo.Real(box.XMin), pdfgo.Real(box.YMin), pdfgo.Real(box.XMax), pdfgo.Real(box.YMax)}, "Resources": resources}
+				if group := page.Dictionary["Group"]; group != nil {
+					copied, err := p.copy(group, 0)
+					if err != nil {
+						return err
+					}
+					dict["Group"] = copied
+				}
+				form = p.add(&pdfgo.Stream{Dictionary: dict, Data: data.Bytes()})
+				forms[placement.Page] = form
+			}
+			name := pdfgo.Name(fmt.Sprintf("P%d", placement.Page))
+			objects[name] = form
+			c, m := placement.Clip, placement.Matrix
+			hs := (page.MediaBox.YMax - page.MediaBox.YMin) / pt
+			x0, y0 := page.MediaBox.XMin, page.MediaBox.YMin
+			content.WriteString("q ")
+			printPDFNumbers(&content, c[0]*pt, (sheet.Height-c[1]-c[3])*pt, c[2]*pt, c[3]*pt)
+			content.WriteString("re W n ")
+			printPDFNumbers(&content, m[0], -m[1], -m[2], m[3], (m[2]*hs+m[4])*pt-m[0]*x0+m[2]*y0, (sheet.Height-m[3]*hs-m[5])*pt+m[1]*x0-m[3]*y0)
+			fmt.Fprintf(&content, "cm /%s Do Q\n", name)
+		}
+		for _, line := range sheet.Lines {
+			content.WriteString("q 0 G ")
+			printPDFNumbers(&content, 0.15*pt)
+			content.WriteString("w ")
+			printPDFNumbers(&content, line[0]*pt, (sheet.Height-line[1])*pt)
+			content.WriteString("m ")
+			printPDFNumbers(&content, line[2]*pt, (sheet.Height-line[3])*pt)
+			content.WriteString("l S Q\n")
+		}
+		resources := pdfgo.Dictionary{"XObject": objects}
+		if sheet.Label != "" {
+			content.WriteString("q 0 g BT /Label 7.94 Tf 1 0 0 1 ")
+			printPDFNumbers(&content, sheet.LabelX*pt, (sheet.Height-sheet.LabelY)*pt)
+			content.WriteString("Tm ")
+			if err := printPDFObject(&content, pdfgo.String(sheet.Label), 0); err != nil {
+				return err
+			}
+			content.WriteString(" Tj ET Q\n")
+			resources["Font"] = pdfgo.Dictionary{"Label": pdfgo.Dictionary{"Type": pdfgo.Name("Font"), "Subtype": pdfgo.Name("Type1"), "BaseFont": pdfgo.Name("Helvetica")}}
+		}
+		stream := p.add(&pdfgo.Stream{Dictionary: pdfgo.Dictionary{}, Data: content.Bytes()})
+		children = append(children, p.add(pdfgo.Dictionary{"Type": pdfgo.Name("Page"), "Parent": pdfgo.Reference{Number: 2}, "MediaBox": pdfgo.Array{pdfgo.Integer(0), pdfgo.Integer(0), pdfgo.Real(sheet.Width * pt), pdfgo.Real(sheet.Height * pt)}, "Resources": resources, "Contents": stream}))
+	}
+	return p.write(writer, children)
+}
+
+// WritePrintImages 逐纸面消费光栅结果，不在输出对象中保留未压缩像素
+// 入参: ctx 输出上下文, writer 输出流, sheets 有序纸面, render 按索引渲染纸面
+// 返回: error 渲染、编码、写入或取消错误
+func WritePrintImages(ctx context.Context, writer io.Writer, sheets []PrintSheet, render func(int) (image.Image, error)) error {
+	p := &printPDFObjects{ctx: ctx, objects: make([]pdfgo.Object, 2)}
+	var children pdfgo.Array
+	const pt = 72.0 / 25.4
+	for i, sheet := range sheets {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		img, err := render(i)
+		if err != nil {
+			return err
+		}
+		var data bytes.Buffer
+		compressed := zlib.NewWriter(&data)
+		b := img.Bounds()
+		row := make([]byte, b.Dx()*3)
+		for y := b.Min.Y; y < b.Max.Y; y++ {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+			for x := b.Min.X; x < b.Max.X; x++ {
+				r, g, blue, _ := img.At(x, y).RGBA()
+				offset := (x - b.Min.X) * 3
+				row[offset], row[offset+1], row[offset+2] = byte(r>>8), byte(g>>8), byte(blue>>8)
+			}
+			if _, err := compressed.Write(row); err != nil {
+				return err
+			}
+		}
+		if err := compressed.Close(); err != nil {
+			return err
+		}
+		picture := p.add(&pdfgo.Stream{Dictionary: pdfgo.Dictionary{"Type": pdfgo.Name("XObject"), "Subtype": pdfgo.Name("Image"), "Width": pdfgo.Integer(b.Dx()), "Height": pdfgo.Integer(b.Dy()), "ColorSpace": pdfgo.Name("DeviceRGB"), "BitsPerComponent": pdfgo.Integer(8), "Filter": pdfgo.Name("FlateDecode")}, Data: data.Bytes()})
+		var content bytes.Buffer
+		content.WriteString("q ")
+		printPDFNumbers(&content, sheet.Width*pt, 0, 0, sheet.Height*pt, 0, 0)
+		content.WriteString("cm /I Do Q\n")
+		stream := p.add(&pdfgo.Stream{Dictionary: pdfgo.Dictionary{}, Data: content.Bytes()})
+		children = append(children, p.add(pdfgo.Dictionary{"Type": pdfgo.Name("Page"), "Parent": pdfgo.Reference{Number: 2}, "MediaBox": pdfgo.Array{pdfgo.Integer(0), pdfgo.Integer(0), pdfgo.Real(sheet.Width * pt), pdfgo.Real(sheet.Height * pt)}, "Resources": pdfgo.Dictionary{"XObject": pdfgo.Dictionary{"I": picture}}, "Contents": stream}))
+	}
+	return p.write(writer, children)
+}
+
+// write 写出完整对象表和交叉引用，失败时由调用方丢弃输出
+// 入参: writer 输出流, children 页面对象引用
+// 返回: error 编码、写入或取消错误
+func (p *printPDFObjects) write(writer io.Writer, children pdfgo.Array) error {
+	p.objects[0] = pdfgo.Dictionary{"Type": pdfgo.Name("Catalog"), "Pages": pdfgo.Reference{Number: 2}}
+	p.objects[1] = pdfgo.Dictionary{"Type": pdfgo.Name("Pages"), "Count": pdfgo.Integer(len(children)), "Kids": children}
+	var out bytes.Buffer
+	out.WriteString("%PDF-1.7\n%\xe2\xe3\xcf\xd3\n")
+	offsets := make([]int, len(p.objects))
+	for i, object := range p.objects {
+		if err := p.ctx.Err(); err != nil {
+			return err
+		}
+		offsets[i] = out.Len()
+		fmt.Fprintf(&out, "%d 0 obj\n", i+1)
+		if err := printPDFObject(&out, object, 0); err != nil {
+			return err
+		}
+		out.WriteString("\nendobj\n")
+	}
+	xref := out.Len()
+	fmt.Fprintf(&out, "xref\n0 %d\n0000000000 65535 f \n", len(offsets)+1)
+	for _, offset := range offsets {
+		fmt.Fprintf(&out, "%010d 00000 n \n", offset)
+	}
+	fmt.Fprintf(&out, "trailer\n<</Size %d/Root 1 0 R>>\nstartxref\n%d\n%%%%EOF\n", len(offsets)+1, xref)
+	return Write(p.ctx, out.Bytes(), writer, WriteOptions{})
+}
+
+// printPDFObject 编码已复制的标准PDF对象，名称和字符串按字节转义
+// 入参: out 对象缓冲区, object 待编码对象, depth 当前递归深度
+// 返回: error 类型或嵌套错误
+func printPDFObject(out *bytes.Buffer, object pdfgo.Object, depth int) error {
+	if depth > 256 {
+		return fmt.Errorf("print PDF object nesting too deep")
+	}
+	switch value := object.(type) {
+	case nil:
+		out.WriteString("null")
+	case pdfgo.Boolean:
+		fmt.Fprintf(out, "%t", value)
+	case pdfgo.Integer:
+		fmt.Fprintf(out, "%d", value)
+	case pdfgo.Real:
+		if math.IsNaN(float64(value)) || math.IsInf(float64(value), 0) {
+			return fmt.Errorf("invalid print PDF number")
+		}
+		out.WriteString(strconv.FormatFloat(float64(value), 'f', -1, 64))
+	case pdfgo.Reference:
+		fmt.Fprintf(out, "%d %d R", value.Number, value.Generation)
+	case pdfgo.Name:
+		out.WriteByte('/')
+		for _, b := range []byte(value) {
+			if b <= 32 || b >= 127 || strings.ContainsRune("()<>[]{}/%#", rune(b)) {
+				fmt.Fprintf(out, "#%02X", b)
+			} else {
+				out.WriteByte(b)
+			}
+		}
+	case pdfgo.String:
+		out.WriteByte('<')
+		out.WriteString(hex.EncodeToString(value))
+		out.WriteByte('>')
+	case pdfgo.Array:
+		out.WriteByte('[')
+		for _, item := range value {
+			if err := printPDFObject(out, item, depth+1); err != nil {
+				return err
+			}
+			out.WriteByte(' ')
+		}
+		out.WriteByte(']')
+	case pdfgo.Dictionary:
+		out.WriteString("<<")
+		for _, key := range slices.Sorted(maps.Keys(value)) {
+			if err := printPDFObject(out, key, depth+1); err != nil {
+				return err
+			}
+			out.WriteByte(' ')
+			if err := printPDFObject(out, value[key], depth+1); err != nil {
+				return err
+			}
+			out.WriteByte('\n')
+		}
+		out.WriteString(">>")
+	case *pdfgo.Stream:
+		dict := maps.Clone(value.Dictionary)
+		dict["Length"] = pdfgo.Integer(len(value.Data))
+		if err := printPDFObject(out, dict, depth+1); err != nil {
+			return err
+		}
+		out.WriteString("\nstream\n")
+		out.Write(value.Data)
+		out.WriteString("\nendstream")
+	default:
+		return fmt.Errorf("unsupported print PDF object %T", object)
+	}
+	return nil
+}

internal/codec/pdf/scratch.go

@@ -0,0 +1,97 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pdf
+
+import "image"
+
+// CompositeTileSize 限定单次合成块的像素边长
+const CompositeTileSize = 256
+
+// CompositeBuffers 在一次局部合成中保留至多八个块容量内的空闲缓冲
+type CompositeBuffers[T any] [8][]T
+
+// RasterBuffers 保存按像素尺寸复用的独占覆盖画布
+type RasterBuffers [8]*image.RGBA
+
+// CoverageRow 读取完整范围内的原生覆盖行，其他类型沿用逐点采样
+// 入参: coverage 覆盖图像, y 行坐标, left 起始列, right 结束列
+// 返回: []byte RGBA像素或空值
+func CoverageRow(coverage image.Image, y, left, right int) []byte {
+	buffer, ok := coverage.(*image.RGBA)
+	if !ok || y < buffer.Rect.Min.Y || y >= buffer.Rect.Max.Y || left < buffer.Rect.Min.X || right > buffer.Rect.Max.X || left >= right {
+		return nil
+	}
+	start := buffer.PixOffset(left, y)
+	return buffer.Pix[start : start+4*(right-left)]
+}
+
+// Acquire 借用尚未初始化的独立缓冲，嵌套调用不复用活动缓冲
+// 入参: count 所需元素数量
+// 返回: []T 可由当前调用独占的缓冲
+func (s *CompositeBuffers[T]) Acquire(count int) []T {
+	selected := -1
+	for i, buffer := range s {
+		if cap(buffer) >= count && (selected < 0 || cap(buffer) < cap(s[selected])) {
+			selected = i
+		}
+	}
+	if selected < 0 {
+		return make([]T, count)
+	}
+	buffer := s[selected]
+	s[selected] = nil
+	return buffer[:count]
+}
+
+// Release 归还已不再访问的缓冲，超出块容量或空闲槽数量时直接释放
+// 入参: buffer 当前调用借用的缓冲
+func (s *CompositeBuffers[T]) Release(buffer []T) {
+	if len(buffer) == 0 || cap(buffer) > CompositeTileSize*CompositeTileSize {
+		return
+	}
+	for i, stored := range s {
+		if stored == nil {
+			s[i] = buffer
+			return
+		}
+	}
+}
+
+// Acquire 借用尺寸相同的独占画布，不清空已有像素
+// 入参: rect 输出像素范围
+// 返回: *image.RGBA 当前调用独占的画布
+func (s *RasterBuffers) Acquire(rect image.Rectangle) *image.RGBA {
+	for i, stored := range s {
+		if stored != nil && stored.Rect == rect {
+			s[i] = nil
+			return stored
+		}
+	}
+	return image.NewRGBA(rect)
+}
+
+// Release 归还块容量内的画布，超出容量或空闲槽数量时直接释放
+// 入参: buffer 当前调用借用的画布
+func (s *RasterBuffers) Release(buffer *image.RGBA) {
+	if buffer == nil || cap(buffer.Pix) > 4*CompositeTileSize*CompositeTileSize {
+		return
+	}
+	for i, stored := range s {
+		if stored == nil {
+			s[i] = buffer
+			return
+		}
+	}
+}

internal/codec/pdf/shading.go

@@ -18,6 +18,12 @@ import (
 	"github.com/xiaoqidun/pdfgo"
 )
 
+// ShadingPixel 保存抗锯齿覆盖率与混合空间分量
+type ShadingPixel struct {
+	Values [4]float64
+	Shape  float64
+}
+
 // ShadingColorants 复用原始浓度缓冲及原生通道映射，不跨并发采样共享
 type ShadingColorants struct {
 	paint   pdfgo.Paint

internal/codec/pdf/text.go

@@ -0,0 +1,102 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pdf
+
+import (
+	"math"
+	"reflect"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// MergeReplacement 统一同一替换区段内的坐标原点，不重新塑形或调整字距
+// 入参: marks 连续文字图元, replacement 整段原文
+// 返回: *pdfgo.TextMark 合并文字, bool 是否可等价合并
+func MergeReplacement(marks []*pdfgo.TextMark, replacement *pdfgo.ReplacementText) (*pdfgo.TextMark, bool) {
+	first := marks[0]
+	style := first.Style
+	paint := style.Fill
+	if first.Font == nil || len(first.Font.Program) == 0 || first.Mode != 0 || first.Size <= 0 || first.HorizontalScale <= 0 || first.Clip != nil || style.SoftMask != nil || style.Transfer != nil || style.AlphaIsShape || style.FillOverprint || paint.Alpha != 1 || !NormalBlend(style.BlendMode) || paint.Tiling != nil || paint.Axial != nil || paint.Radial != nil || paint.Mesh != nil || paint.Function != nil {
+		return nil, false
+	}
+	inverse, ok := first.Matrix.Inverse()
+	if !ok {
+		return nil, false
+	}
+	count := 0
+	sequence := first.Sequence
+	for _, mark := range marks {
+		if mark.Font != first.Font || mark.Size != first.Size || mark.HorizontalScale != first.HorizontalScale || mark.Mode != first.Mode || mark.Clip != nil || len(mark.Glyphs) != len(mark.Positions) || !reflect.DeepEqual(mark.Style, style) {
+			return nil, false
+		}
+		if mark.Matrix[0] != first.Matrix[0] || mark.Matrix[1] != first.Matrix[1] || mark.Matrix[2] != first.Matrix[2] || mark.Matrix[3] != first.Matrix[3] {
+			return nil, false
+		}
+		count += len(mark.Glyphs)
+		sequence = CommonSequence(sequence, mark.Sequence)
+	}
+	if count == 0 {
+		return nil, false
+	}
+	merged := *first
+	merged.Replacement = replacement
+	merged.Sequence = sequence
+	merged.Glyphs = make([]pdfgo.Glyph, 0, count)
+	merged.Positions = make([]pdfgo.Point, 0, count)
+	for _, mark := range marks {
+		dx, dy := mark.Matrix[4]-first.Matrix[4], mark.Matrix[5]-first.Matrix[5]
+		offset := pdfgo.Point{X: inverse[0]*dx + inverse[2]*dy, Y: inverse[1]*dx + inverse[3]*dy}
+		for _, point := range mark.Positions {
+			point.X += offset.X
+			point.Y += offset.Y
+			if math.IsNaN(point.X) || math.IsNaN(point.Y) || math.IsInf(point.X, 0) || math.IsInf(point.Y, 0) {
+				return nil, false
+			}
+			merged.Positions = append(merged.Positions, point)
+		}
+		merged.Glyphs = append(merged.Glyphs, mark.Glyphs...)
+	}
+	return &merged, true
+}
+
+// CommonSequence 查找两个内容区段的最近共同外层，不将合并内容归入单个子区段
+// 入参: first 首个区段, second 后续区段
+// 返回: *pdfgo.ContentSequence 共同区段，没有共同区段时为空
+func CommonSequence(first, second *pdfgo.ContentSequence) *pdfgo.ContentSequence {
+	if first == second {
+		return first
+	}
+	if first == nil || second == nil {
+		return nil
+	}
+	depth := func(sequence *pdfgo.ContentSequence) int {
+		count := 0
+		for ; sequence != nil; sequence = sequence.Parent {
+			count++
+		}
+		return count
+	}
+	a, b := depth(first), depth(second)
+	for ; a > b; a-- {
+		first = first.Parent
+	}
+	for ; b > a; b-- {
+		second = second.Parent
+	}
+	for first != second {
+		first, second = first.Parent, second.Parent
+	}
+	return first
+}

internal/webui/webui_print.go

@@ -0,0 +1,141 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package webui
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	"github.com/xiaoqidun/ofdgo"
+)
+
+// preparePrint 从当前编辑入口创建独立打印快照，业务选项由公开库统一校验
+// 入参: args 排版选项及可选输出任务标识
+// 返回: any 纸面布局, error 快照、权限或排版错误
+func (e *businessEngine) preparePrint(args []platformValue) (any, error) {
+	if e.currentSession == nil || len(args) == 0 {
+		return nil, fmt.Errorf("ofd document is not opened")
+	}
+	var options ofdgo.PrintOptions
+	if err := json.Unmarshal([]byte(platformJSON(args[0])), &options); err != nil {
+		return nil, err
+	}
+	ctx := e.operationContext()
+	if len(args) > 1 {
+		ctx = e.newOutputContext(args[1])
+	}
+	editor := e.currentEditor
+	if editor == nil {
+		var err error
+		editor, err = e.currentSession.Reader.EditorContext(ctx)
+		if err != nil {
+			return nil, err
+		}
+	}
+	source := e.currentSession.Renderer
+	dirs, fonts := source.FontSources()
+	document, err := editor.PreparePrint(ctx, options, ofdgo.WithRenderBackends(source.Backends()), ofdgo.WithFontDirs(dirs...), ofdgo.WithFontFS(fonts...))
+	if err != nil {
+		return nil, err
+	}
+	if e.printDocument != nil {
+		_ = e.printDocument.Close()
+	}
+	e.printDocument = document
+	data, err := json.Marshal(document.Layout())
+	if err != nil {
+		return nil, err
+	}
+	return successResult(platformParseJSON(data)), nil
+}
+
+// layoutPrint 在既有快照上调整排版，预览期间不重复复制源包
+// 入参: args 新排版选项及可选输出任务标识
+// 返回: any 新纸面布局, error 状态、权限或排版错误
+func (e *businessEngine) layoutPrint(args []platformValue) (any, error) {
+	if e.printDocument == nil || len(args) == 0 {
+		return nil, fmt.Errorf("print document is not prepared")
+	}
+	var options ofdgo.PrintOptions
+	if err := json.Unmarshal([]byte(platformJSON(args[0])), &options); err != nil {
+		return nil, err
+	}
+	ctx := e.operationContext()
+	if len(args) > 1 {
+		ctx = e.newOutputContext(args[1])
+	}
+	next, err := e.printDocument.Reconfigure(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+	_ = e.printDocument.Close()
+	e.printDocument = next
+	data, err := json.Marshal(next.Layout())
+	if err != nil {
+		return nil, err
+	}
+	return successResult(platformParseJSON(data)), nil
+}
+
+// printSide 按需输出一个纸面，不使用阅读区缓存或缩略图
+// 入参: args 零基纸面索引及可选输出任务标识
+// 返回: any 内嵌资源的SVG纸面, error 状态或渲染错误
+func (e *businessEngine) printSide(args []platformValue) (any, error) {
+	if e.printDocument == nil || len(args) == 0 {
+		return nil, fmt.Errorf("print document is not prepared")
+	}
+	ctx := e.operationContext()
+	if len(args) > 1 {
+		ctx = e.newOutputContext(args[1])
+	}
+	var output bytes.Buffer
+	if err := e.printDocument.RenderSVG(ctx, args[0].Int(), &output); err != nil {
+		return nil, err
+	}
+	return successResult(map[string]any{"svg": output.String()}), nil
+}
+
+// printPDF 输出和预览相同的打印布局，便于另存或交给第三方打印系统
+// 入参: args 可选输出任务标识
+// 返回: any PDF数据及媒体类型, error 状态或输出错误
+func (e *businessEngine) printPDF(args []platformValue) (any, error) {
+	if e.printDocument == nil {
+		return nil, fmt.Errorf("print document is not prepared")
+	}
+	ctx := e.operationContext()
+	if len(args) > 0 {
+		ctx = e.newOutputContext(args[0])
+	}
+	var output bytes.Buffer
+	if err := e.printDocument.WritePDF(ctx, &output); err != nil {
+		return nil, err
+	}
+	return successResult(map[string]any{"bytes": bytesToJS(output.Bytes()), "mime": "application/pdf"}), nil
+}
+
+// discardPrint 释放当前打印快照，可重复调用
+// 入参: _ 保留的调用参数
+// 返回: any 空结果, error 资源释放错误
+func (e *businessEngine) discardPrint(_ []platformValue) (any, error) {
+	if e.printDocument != nil {
+		err := e.printDocument.Close()
+		e.printDocument = nil
+		if err != nil {
+			return nil, err
+		}
+	}
+	return successResult(nil), nil
+}

internal/webui/webui_wasm.go

@@ -0,0 +1,295 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build js && wasm
+
+package webui
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"syscall/js"
+
+	"github.com/xiaoqidun/ofdgo"
+)
+
+const (
+	platformTypeNumber   = js.TypeNumber
+	platformTypeString   = js.TypeString
+	platformTypeBoolean  = js.TypeBoolean
+	platformTypeObject   = js.TypeObject
+	platformTypeFunction = js.TypeFunction
+)
+
+// platformValue 浏览器参数值
+type platformValue = js.Value
+
+// wasmEngines 管理共享资源的独立浏览器业务会话
+type wasmEngines struct {
+	resources *ofdgo.Resources
+	engines   map[string]*businessEngine
+}
+
+// RunWASM 注册浏览器WASM接口并阻塞运行
+func RunWASM() {
+	resources, _ := ofdgo.NewResources(ofdgo.ResourceOptions{Parallelism: 1, MemoryLimit: 64 << 20, CacheBytes: 48 << 20, SnapshotBytes: 32 << 20})
+	engines := &wasmEngines{resources: resources, engines: make(map[string]*businessEngine)}
+	registerCallback("ofdgoEngineOpen", engines.open)
+	registerAsyncCallback("ofdgoEngineCall", engines.call)
+	registerCallback("ofdgoEngineClose", engines.close)
+	select {}
+}
+
+// open 创建具有稳定标识的独立业务会话
+// 入参: args 会话标识
+// 返回: any 空结果, error 参数或会话错误
+func (w *wasmEngines) open(args []js.Value) (any, error) {
+	if len(args) != 1 || args[0].Type() != js.TypeString || args[0].String() == "" {
+		return nil, fmt.Errorf("missing engine ID")
+	}
+	id := args[0].String()
+	if w.engines[id] != nil {
+		return nil, fmt.Errorf("engine already exists: %s", id)
+	}
+	w.engines[id] = &businessEngine{resources: w.resources}
+	return nil, nil
+}
+
+// call 按会话标识分派业务命令，统一绑定本次调用的取消上下文
+// 入参: args 会话标识、命令、取消检查点及业务参数
+// 返回: any 业务结果, error 调用错误
+func (w *wasmEngines) call(args []js.Value) (any, error) {
+	if len(args) < 3 || args[0].Type() != js.TypeString || args[1].Type() != js.TypeString {
+		return nil, fmt.Errorf("missing engine ID or operation")
+	}
+	e := w.engines[args[0].String()]
+	if e == nil {
+		return nil, fmt.Errorf("unknown engine: %s", args[0].String())
+	}
+	name := args[1].String()
+	fn := e.businessCommands()[name]
+	if fn == nil {
+		return nil, fmt.Errorf("unknown operation: %s", name)
+	}
+	if err := e.checkDocument(name); err != nil {
+		return nil, err
+	}
+	e.ctx = context.Background()
+	if args[2].Type() == js.TypeFunction {
+		e.ctx = e.newOutputContext(args[2])
+	}
+	ctx := e.ctx
+	if name != "ofdgoSaveSnapshot" && e.currentSession != nil {
+		e.currentSession.Renderer.OutputContext = ctx
+	}
+	defer func() {
+		if e.ctx == ctx {
+			e.ctx = nil
+		}
+		if name != "ofdgoSaveSnapshot" && e.currentSession != nil {
+			e.currentSession.Renderer.OutputContext = context.Background()
+		}
+	}()
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if err := e.preparePDF(name, args[3:]); err != nil {
+		return nil, err
+	}
+	return fn(args[3:])
+}
+
+// close 释放会话的文档、编辑器、导入及剪贴板，不关闭共享资源
+// 入参: args 会话标识
+// 返回: any 空结果, error 参数或关闭错误
+func (w *wasmEngines) close(args []js.Value) (any, error) {
+	if len(args) != 1 || args[0].Type() != js.TypeString || args[0].String() == "" {
+		return nil, fmt.Errorf("missing engine ID")
+	}
+	id := args[0].String()
+	e := w.engines[id]
+	if e == nil {
+		return nil, nil
+	}
+	delete(w.engines, id)
+	_, _ = e.discardPrint(nil)
+	e.clearPDF()
+	e.clearImport()
+	err := e.currentSession.Close()
+	*e = businessEngine{}
+	return nil, err
+}
+
+// awaitExport 等待浏览器处理导出检查点
+// 入参: fn 浏览器回调, args 回调参数
+// 返回: error 写入错误或取消原因
+func awaitExport(fn js.Value, args ...any) error {
+	done := make(chan error)
+	callback := js.FuncOf(func(this js.Value, args []js.Value) any {
+		var err error
+		if args[1].Bool() {
+			err = context.Canceled
+		} else if message := args[0].String(); message != "" {
+			err = fmt.Errorf("%s", message)
+		}
+		done <- err
+		return nil
+	})
+	defer callback.Release()
+	fn.Invoke(append(args, callback)...)
+	return <-done
+}
+
+// registerCallback 注册浏览器回调函数
+// 入参: name 回调名称, fn 回调函数
+func registerCallback(name string, fn func([]js.Value) (any, error)) {
+	cb := js.FuncOf(func(this js.Value, args []js.Value) any {
+		return callbackResult(fn, args)
+	})
+	js.Global().Set(name, cb)
+}
+
+// registerAsyncCallback 注册异步回调，为浏览器处理数据和取消请求让出事件循环
+// 入参: name 回调名称, fn 回调函数
+func registerAsyncCallback(name string, fn func([]js.Value) (any, error)) {
+	cb := js.FuncOf(func(this js.Value, args []js.Value) any {
+		executor := js.FuncOf(func(this js.Value, callbacks []js.Value) any {
+			resolve := callbacks[0]
+			go func() {
+				resolve.Invoke(callbackResult(fn, args))
+			}()
+			return nil
+		})
+		defer executor.Release()
+		return js.Global().Get("Promise").New(executor)
+	})
+	js.Global().Set(name, cb)
+}
+
+// callbackResult 转换浏览器接口结果
+// 入参: fn 回调函数, args 回调参数
+// 返回: any 浏览器结果
+func callbackResult(fn func([]js.Value) (any, error), args []js.Value) any {
+	data, err := (&businessEngine{}).safeCall(fn, args)
+	if err != nil {
+		result := failureResult(err)
+		return (&businessEngine{}).encodeResult(result)
+	}
+	if result, ok := data.(js.Value); ok {
+		return result
+	}
+	return (&businessEngine{}).encodeResult(apiResult{OK: true, Data: data})
+}
+
+// loadConversionFont 按需读取浏览器已授权字体，不预读系统字体目录
+// 入参: load 浏览器读取函数, name 字体文件名
+// 返回: []byte 字体内容, error 读取错误或取消原因
+func (e *businessEngine) loadConversionFont(load js.Value, name string) ([]byte, error) {
+	done := make(chan error, 1)
+	var data []byte
+	callback := js.FuncOf(func(this js.Value, args []js.Value) any {
+		var err error
+		if args[2].Bool() {
+			err = context.Canceled
+		} else if message := args[1].String(); message != "" {
+			err = fmt.Errorf("%s", message)
+		} else {
+			data, err = e.bytesFromJS(args[0])
+		}
+		done <- err
+		return nil
+	})
+	defer callback.Release()
+	load.Invoke(name, callback)
+	err := <-done
+	return data, err
+}
+
+// successResult 创建成功接口结果
+// 入参: data 返回数据
+// 返回: js.Value 接口结果
+func successResult(data any) js.Value {
+	result := js.Global().Get("Object").New()
+	result.Set("ok", true)
+	result.Set("data", data)
+	return result
+}
+
+// bytesToJS 将字节数据转换为Uint8Array
+// 入参: data 字节数据
+// 返回: js.Value Uint8Array对象
+func bytesToJS(data []byte) js.Value {
+	value := js.Global().Get("Uint8Array").New(len(data))
+	js.CopyBytesToJS(value, data)
+	return value
+}
+
+// bytesFromJS 从浏览器值读取二进制数据
+// 入参: value 浏览器值
+// 返回: []byte 二进制数据, error 错误信息
+func (e *businessEngine) bytesFromJS(value js.Value) ([]byte, error) {
+	if value.IsUndefined() || value.IsNull() {
+		return nil, fmt.Errorf("missing binary data")
+	}
+	uint8Array := js.Global().Get("Uint8Array")
+	arrayBuffer := js.Global().Get("ArrayBuffer")
+	if value.InstanceOf(arrayBuffer) {
+		value = uint8Array.New(value)
+	}
+	if !value.InstanceOf(uint8Array) {
+		return nil, fmt.Errorf("binary data must be Uint8Array or ArrayBuffer")
+	}
+	data := make([]byte, value.Get("byteLength").Int())
+	if n := js.CopyBytesToGo(data, value); n != len(data) {
+		return nil, fmt.Errorf("copied %d of %d bytes", n, len(data))
+	}
+	return data, nil
+}
+
+// platformValueOf 转换浏览器参数
+func platformValueOf(v any) platformValue { return js.ValueOf(v) }
+
+// platformNull 返回空参数
+func platformNull() platformValue { return js.Null() }
+
+// platformCopyBytes 复制浏览器字节
+func platformCopyBytes(dst []byte, src platformValue) int { return js.CopyBytesToGo(dst, src) }
+
+// platformJSON 编码小参数
+func platformJSON(v platformValue) string {
+	return js.Global().Get("JSON").Call("stringify", v).String()
+}
+
+// platformParseJSON 解析结构参数
+func platformParseJSON(data []byte) map[string]any {
+	var result map[string]any
+	if err := json.Unmarshal(data, &result); err != nil {
+		panic(err)
+	}
+	return result
+}
+
+// inputFromValue 读取浏览器随机输入或二进制数据
+func (e *businessEngine) inputFromValue(value platformValue) (*ofdgo.Input, error) {
+	if value.Type() == platformTypeObject && !value.IsNull() && value.Get("read").Type() == platformTypeFunction {
+		return ofdgo.NewInput(&browserReaderAt{read: value.Get("read"), size: int64(value.Get("size").Float())}, int64(value.Get("size").Float()))
+	}
+	data, err := e.bytesFromJS(value)
+	if err != nil {
+		return nil, err
+	}
+	return ofdgo.NewInput(bytes.NewReader(data), int64(len(data)))
+}

internal/webview/webview_files.go

@@ -0,0 +1,622 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package webview
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"math/big"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/xiaoqidun/ofdgo"
+	basefile "github.com/xiaoqidun/ofdgo/internal/base/file"
+)
+
+// fileEntry 保存窗口授权的文件或目录
+type fileEntry struct {
+	path       string
+	name       string
+	data       []byte
+	file       *os.File
+	stop       func() bool
+	directory  bool
+	owned      bool
+	temporary  bool
+	saveTarget ofdgo.Output
+	readers    int
+	retired    bool
+	dropHandle string
+}
+
+// fileStore 管理窗口范围内的文件授权和临时数据
+type fileStore struct {
+	mu        sync.Mutex
+	entries   map[string]*fileEntry
+	writers   map[string]*fileWriter
+	temporary string
+	closed    bool
+}
+
+// fileWriter 在同目录临时文件中保存输出
+type fileWriter struct {
+	id     string
+	store  *fileStore
+	output ofdgo.WriteTransaction
+}
+
+// newFileStore 创建独立文件授权表
+// 返回: *fileStore 文件授权表, error 创建错误
+func newFileStore() (*fileStore, error) {
+	dir, err := temporaryDirectory()
+	if err != nil {
+		return nil, err
+	}
+	return &fileStore{entries: make(map[string]*fileEntry), writers: make(map[string]*fileWriter), temporary: dir}, nil
+}
+
+// temporaryDirectory 创建独立临时目录
+// 返回: string 目录路径, error 创建错误
+func temporaryDirectory() (string, error) {
+	for i := 0; i < 100; i++ {
+		n, err := rand.Int(rand.Reader, big.NewInt(10000000))
+		if err != nil {
+			return "", err
+		}
+		path := filepath.Join(os.TempDir(), fmt.Sprintf("ofdgo-%07d", n.Int64()))
+		err = os.Mkdir(path, 0700)
+		if os.IsExist(err) {
+			continue
+		}
+		return path, err
+	}
+	return "", os.ErrExist
+}
+
+// temporaryFile 创建临时文件
+// 入参: dir 所在目录, prefix 文件名前缀
+// 返回: *os.File 临时文件, error 创建错误
+func temporaryFile(dir, prefix string) (*os.File, error) {
+	for i := 0; i < 100; i++ {
+		n, err := rand.Int(rand.Reader, big.NewInt(10000000))
+		if err != nil {
+			return nil, err
+		}
+		path := filepath.Join(dir, fmt.Sprintf("%s%07d.tmp", prefix, n.Int64()))
+		file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
+		if os.IsExist(err) {
+			continue
+		}
+		return file, err
+	}
+	return nil, os.ErrExist
+}
+
+// add 登记已有授权文件
+// 入参: name 文件路径, directory 是否为目录
+// 返回: map[string]any 句柄描述, error 登记错误
+func (s *fileStore) add(name string, directory bool) (map[string]any, error) {
+	info, err := os.Stat(name)
+	if err != nil {
+		return nil, err
+	}
+	if info.IsDir() != directory {
+		return nil, fmt.Errorf("文件类型不匹配")
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	id := rand.Text()
+	entry := &fileEntry{path: name, name: filepath.Base(name), directory: directory}
+	if !directory {
+		entry.saveTarget, err = ofdgo.NewFileOutput(name)
+		if err != nil {
+			return nil, err
+		}
+	}
+	s.entries[id] = entry
+	return s.descriptor(id), nil
+}
+
+// addDrop 登记拖放文件及读取快照，失败时撤销本次授权
+// 入参: name 拖放文件路径
+// 返回: map[string]any 文件描述, error 登记错误
+func (s *fileStore) addDrop(name string) (map[string]any, error) {
+	handle, err := s.add(name, false)
+	if err != nil {
+		return nil, err
+	}
+	id := handle["nativeHandle"].(string)
+	file, err := s.file(id)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil && !s.closed {
+		if entry := s.entries[file["nativeFile"].(string)]; entry != nil && s.entries[id] != nil {
+			entry.dropHandle = id
+			file["drop"] = true
+			return file, nil
+		}
+		err = os.ErrNotExist
+	}
+	delete(s.entries, id)
+	if file != nil {
+		key := file["nativeFile"].(string)
+		if entry := s.entries[key]; entry != nil {
+			delete(s.entries, key)
+			if entry.file != nil {
+				entry.file.Close()
+			}
+		}
+	}
+	if err == nil {
+		err = os.ErrClosed
+	}
+	return nil, err
+}
+
+// discardDrop 撤销未接收的拖放文件及其授权，不删除源文件
+// 入参: id 拖放读取快照标识
+func (s *fileStore) discardDrop(id string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	entry := s.entries[id]
+	if entry == nil || entry.dropHandle == "" {
+		return
+	}
+	delete(s.entries, entry.dropHandle)
+	delete(s.entries, id)
+	entry.retired = true
+	if entry.file != nil && entry.readers == 0 {
+		entry.file.Close()
+	}
+}
+
+// save 登记用户选择的输出路径
+// 入参: name 输出文件路径
+// 返回: map[string]any 句柄描述
+func (s *fileStore) save(name string) map[string]any {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	id := rand.Text()
+	s.entries[id] = &fileEntry{path: name, name: filepath.Base(name)}
+	return s.descriptor(id)
+}
+
+// descriptor 返回文件句柄，不暴露本机路径
+// 入参: id 授权标识
+// 返回: map[string]any 句柄描述
+func (s *fileStore) descriptor(id string) map[string]any {
+	entry := s.entries[id]
+	kind := "file"
+	if entry.directory {
+		kind = "directory"
+	}
+	return map[string]any{"nativeHandle": id, "name": entry.name, "kind": kind}
+}
+
+// file 创建独立读取快照并返回资源描述
+// 入参: id 授权标识
+// 返回: map[string]any 资源描述, error 读取错误
+func (s *fileStore) file(id string) (map[string]any, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	entry := s.entries[id]
+	if entry == nil || entry.directory {
+		return nil, fmt.Errorf("文件授权无效")
+	}
+	handle := s.descriptor(id)
+	size := int64(len(entry.data))
+	if entry.data == nil {
+		file, err := basefile.Open(entry.path)
+		if err != nil {
+			return nil, err
+		}
+		info, err := file.Stat()
+		if err != nil {
+			file.Close()
+			return nil, err
+		}
+		size = info.Size()
+		id = rand.Text()
+		entry = &fileEntry{path: entry.path, name: entry.name, file: file}
+		s.entries[id] = entry
+	}
+	return map[string]any{"nativeFile": id, "name": entry.name, "size": size, "url": "/__native/data/" + id, "handle": handle}, nil
+}
+
+// resolve 按授权标识读取文件并保持随机读取句柄
+// 入参: id 授权标识
+// 返回: io.ReaderAt 随机读取器, int64 文件大小, error 读取错误
+func (s *fileStore) resolve(id string) (io.ReaderAt, int64, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	entry := s.entries[id]
+	if entry == nil || entry.directory {
+		return nil, 0, fmt.Errorf("文件授权无效")
+	}
+	if entry.data != nil {
+		return bytes.NewReader(entry.data), int64(len(entry.data)), nil
+	}
+	if entry.file == nil {
+		file, err := basefile.Open(entry.path)
+		if err != nil {
+			return nil, 0, err
+		}
+		entry.file = file
+	}
+	info, err := entry.file.Stat()
+	if err != nil {
+		return nil, 0, err
+	}
+	return entry.file, info.Size(), nil
+}
+
+// bytes 登记原生输出，页面退出时释放未读取数据
+// 入参: ctx 页面上下文, data 输出数据
+// 返回: map[string]any 资源描述，页面取消或授权表关闭时返回nil
+func (s *fileStore) bytes(ctx context.Context, data []byte) map[string]any {
+	if data == nil {
+		data = []byte{}
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.closed || ctx.Err() != nil {
+		return nil
+	}
+	id := rand.Text()
+	s.entries[id] = &fileEntry{data: data, name: "data", stop: context.AfterFunc(ctx, func() { s.release(id) })}
+	return map[string]any{"nativeFile": id, "size": len(data), "name": "data", "url": "/__native/data/" + id, "temporary": true}
+}
+
+// resource 创建独立资源读取句柄
+// 入参: id 文件标识
+// 返回: io.ReaderAt 随机读取器, int64 文件大小, func() error 关闭函数, error 读取错误
+func (s *fileStore) resource(id string) (io.ReaderAt, int64, func() error, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	entry := s.entries[id]
+	if entry == nil || entry.directory {
+		return nil, 0, nil, os.ErrNotExist
+	}
+	if entry.data != nil {
+		return bytes.NewReader(entry.data), int64(len(entry.data)), nil, nil
+	}
+	if entry.file != nil && !entry.temporary {
+		info, err := entry.file.Stat()
+		if err != nil {
+			return nil, 0, nil, err
+		}
+		entry.readers++
+		var once sync.Once
+		var closeErr error
+		return entry.file, info.Size(), func() error {
+			once.Do(func() {
+				s.mu.Lock()
+				defer s.mu.Unlock()
+				entry.readers--
+				if entry.retired && entry.readers == 0 {
+					closeErr = entry.file.Close()
+				}
+			})
+			return closeErr
+		}, nil
+	}
+	file, err := basefile.Open(entry.path)
+	if err != nil {
+		return nil, 0, nil, err
+	}
+	info, err := file.Stat()
+	if err != nil {
+		file.Close()
+		return nil, 0, nil, err
+	}
+	return file, info.Size(), file.Close, nil
+}
+
+// release 释放读取快照、内存结果或临时文件，保留在途读取及源文件
+// 入参: id 资源标识
+func (s *fileStore) release(id string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if entry := s.entries[id]; entry != nil && (entry.data != nil || entry.temporary || entry.file != nil) {
+		delete(s.entries, id)
+		entry.retired = true
+		if entry.stop != nil {
+			entry.stop()
+		}
+		if entry.file != nil && entry.readers == 0 {
+			entry.file.Close()
+		}
+		if entry.temporary {
+			os.Remove(entry.path)
+		}
+	}
+}
+
+// child 在已授权目录中查找或创建直接子项
+// 入参: id 目录授权标识, name 子项名称, directory 是否为目录, create 是否允许创建
+// 返回: map[string]any 句柄描述, error 访问错误
+func (s *fileStore) child(id, name string, directory, create bool) (map[string]any, error) {
+	if !fs.ValidPath(name) || name == "." || strings.ContainsAny(name, "/\\:") {
+		return nil, fmt.Errorf("文件名无效")
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	parent := s.entries[id]
+	if parent == nil || !parent.directory {
+		return nil, fmt.Errorf("目录授权无效")
+	}
+	path := filepath.Join(parent.path, name)
+	for key, entry := range s.entries {
+		if entry.path == path && entry.directory == directory {
+			if _, err := os.Stat(path); err == nil {
+				return s.descriptor(key), nil
+			}
+		}
+	}
+	root, err := os.OpenRoot(parent.path)
+	if err != nil {
+		return nil, err
+	}
+	defer root.Close()
+	info, err := root.Stat(name)
+	created := false
+	if errors.Is(err, os.ErrNotExist) && create {
+		if directory {
+			err = root.Mkdir(name, 0755)
+		} else {
+			var file *os.File
+			file, err = root.OpenFile(name, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
+			if err == nil {
+				err = file.Close()
+			}
+		}
+		if err != nil {
+			return nil, err
+		}
+		created = true
+		info, err = root.Stat(name)
+	}
+	if err != nil {
+		return nil, err
+	}
+	if info.IsDir() != directory {
+		return nil, fmt.Errorf("文件类型不匹配")
+	}
+	key := rand.Text()
+	s.entries[key] = &fileEntry{path: filepath.Join(parent.path, name), name: name, directory: directory, owned: created}
+	return s.descriptor(key), nil
+}
+
+// reserve 为批量输出独占创建入口并避开已有文件
+// 入参: id 目录授权标识, base 基础名称, extension 扩展名, directory 是否创建目录
+// 返回: string 输出基础名称, string 输出入口名称, error 创建错误
+func (s *fileStore) reserve(id, base, extension string, directory bool) (string, string, error) {
+	if !fs.ValidPath(base) || base == "." || strings.ContainsAny(base+extension, "/\\:") {
+		return "", "", fmt.Errorf("文件名无效")
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	parent := s.entries[id]
+	if parent == nil || !parent.directory {
+		return "", "", fmt.Errorf("目录授权无效")
+	}
+	root, err := os.OpenRoot(parent.path)
+	if err != nil {
+		return "", "", err
+	}
+	defer root.Close()
+	for suffix := 0; ; suffix++ {
+		stem := base
+		if suffix > 0 {
+			stem = fmt.Sprintf("%s (%d)", base, suffix+1)
+		}
+		name := stem
+		if !directory {
+			name += "." + extension
+		}
+		if directory {
+			err = root.Mkdir(name, 0755)
+		} else {
+			var file *os.File
+			file, err = root.OpenFile(name, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
+			if err == nil {
+				err = file.Close()
+				if err != nil {
+					root.Remove(name)
+				}
+			}
+		}
+		if errors.Is(err, os.ErrExist) {
+			continue
+		}
+		if err != nil {
+			return "", "", err
+		}
+		s.entries[rand.Text()] = &fileEntry{path: filepath.Join(parent.path, name), name: name, directory: directory, owned: true}
+		return stem, name, nil
+	}
+}
+
+// begin 创建文件写入事务
+// 入参: ctx 取消上下文, id 输出授权标识
+// 返回: *fileWriter 事务写入器, error 创建错误
+func (s *fileStore) begin(ctx context.Context, id string) (*fileWriter, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.closed {
+		return nil, os.ErrClosed
+	}
+	entry := s.entries[id]
+	if entry == nil || entry.directory || entry.path == "" {
+		return nil, fmt.Errorf("输出授权无效")
+	}
+	if entry.saveTarget == nil {
+		var err error
+		entry.saveTarget, err = ofdgo.NewFileOutput(entry.path)
+		if err != nil {
+			return nil, err
+		}
+	}
+	output, err := entry.saveTarget.Begin(ctx)
+	if err != nil {
+		return nil, err
+	}
+	writer := &fileWriter{id: rand.Text(), store: s, output: output}
+	s.writers[writer.id] = writer
+	return writer, nil
+}
+
+// remove 清理由当前窗口创建的目录子项
+// 入参: id 目录授权标识, name 子项名称, recursive 是否递归删除
+// 返回: error 删除错误
+func (s *fileStore) remove(id, name string, recursive bool) error {
+	if !fs.ValidPath(name) || name == "." || strings.ContainsAny(name, "/\\:") {
+		return fmt.Errorf("文件名无效")
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	parent := s.entries[id]
+	if parent == nil || !parent.directory {
+		return fmt.Errorf("目录授权无效")
+	}
+	target := filepath.Join(parent.path, name)
+	owned := false
+	for _, entry := range s.entries {
+		if entry.path == target && entry.owned {
+			owned = true
+			break
+		}
+	}
+	if !owned {
+		if _, err := os.Stat(target); errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+		return fmt.Errorf("只能清理本次创建的输出")
+	}
+	root, err := os.OpenRoot(parent.path)
+	if err != nil {
+		return err
+	}
+	defer root.Close()
+	for key, entry := range s.entries {
+		if entry.path == target || recursive && strings.HasPrefix(entry.path, target+string(filepath.Separator)) {
+			entry.retired = true
+			if entry.file != nil && entry.readers == 0 {
+				entry.file.Close()
+			}
+			delete(s.entries, key)
+		}
+	}
+	if recursive {
+		return root.RemoveAll(name)
+	}
+	return root.Remove(name)
+}
+
+// Write 追加输出数据
+// 入参: data 输出数据
+// 返回: int 写入字节数, error 写入错误
+func (w *fileWriter) Write(data []byte) (int, error) {
+	return w.output.Write(data)
+}
+
+// Close 同步并替换目标文件
+// 返回: error 提交错误
+func (w *fileWriter) Close() error {
+	defer w.release()
+	if err := w.output.Commit(); err != nil {
+		return errors.Join(err, w.output.Abort())
+	}
+	return nil
+}
+
+// Abort 删除未提交的临时输出
+// 返回: error 清理错误
+func (w *fileWriter) Abort() error {
+	defer w.release()
+	return w.output.Abort()
+}
+
+// release 移除已结束的写入事务
+func (w *fileWriter) release() {
+	w.store.mu.Lock()
+	defer w.store.mu.Unlock()
+	delete(w.store.writers, w.id)
+}
+
+// serve 提供窗口内资源，不建立网络监听器
+// 入参: w 响应写入器, r 资源请求
+func (s *fileStore) serve(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Cache-Control", "no-store")
+	if !strings.HasPrefix(r.URL.Path, "/__native/data/") || r.Method != http.MethodGet && r.Method != http.MethodHead {
+		http.NotFound(w, r)
+		return
+	}
+	id := strings.TrimPrefix(r.URL.Path, "/__native/data/")
+	reader, size, err := s.resolve(id)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	s.mu.Lock()
+	entry := s.entries[id]
+	s.mu.Unlock()
+	if entry == nil {
+		http.NotFound(w, r)
+		return
+	}
+	http.ServeContent(w, r, entry.name, time.Time{}, io.NewSectionReader(reader, 0, size))
+}
+
+// close 释放授权文件与未提交输出
+// 返回: error 清理错误
+func (s *fileStore) close() error {
+	s.mu.Lock()
+	if s.closed {
+		s.mu.Unlock()
+		return nil
+	}
+	s.closed = true
+	writers := s.writers
+	entries := s.entries
+	s.writers = make(map[string]*fileWriter)
+	s.entries = make(map[string]*fileEntry)
+	s.mu.Unlock()
+	var err error
+	for _, writer := range writers {
+		err = errors.Join(err, writer.Abort())
+	}
+	for _, entry := range entries {
+		if entry.stop != nil {
+			entry.stop()
+		}
+		s.mu.Lock()
+		entry.retired = true
+		if entry.file != nil && entry.readers == 0 {
+			err = errors.Join(err, entry.file.Close())
+		}
+		s.mu.Unlock()
+	}
+	return errors.Join(err, os.RemoveAll(s.temporary))
+}

internal/webview/webview_linux.go

@@ -0,0 +1,64 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package webview
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// conversionMemory 未提供系统内存探测时仅按并行数调度
+var conversionMemory func() int64
+
+// instanceDirectory 解析数据目录的实际路径，使符号链接复用同一实例
+// 入参: path 数据目录路径
+// 返回: string 规范路径, error 路径解析错误
+func instanceDirectory(path string) (string, error) {
+	return filepath.EvalSymlinks(path)
+}
+
+// fontNameLanguage 获取Linux区域设置对应的OpenType名称表标识
+// 返回: uint16 名称表平台标识, uint16 显示语言标识
+func fontNameLanguage() (uint16, uint16) {
+	locale := ""
+	for _, name := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if locale = os.Getenv(name); locale != "" {
+			break
+		}
+	}
+	locale = strings.ToLower(strings.ReplaceAll(locale, "-", "_"))
+	locale, _, _ = strings.Cut(locale, ".")
+	locale, _, _ = strings.Cut(locale, "@")
+	switch locale {
+	case "zh", "zh_cn", "zh_hans":
+		return 3, 0x0804
+	case "zh_hk":
+		return 3, 0x0c04
+	case "zh_mo":
+		return 3, 0x1404
+	case "zh_tw", "zh_hant":
+		return 3, 0x0404
+	case "zh_sg":
+		return 3, 0x1004
+	case "ja", "ja_jp":
+		return 3, 0x0411
+	case "ko", "ko_kr":
+		return 3, 0x0412
+	case "c", "posix", "en", "en_us":
+		return 3, 0x0409
+	}
+	return 0xffff, 0xffff
+}

internal/webview/webview_other.go

@@ -0,0 +1,35 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !windows && !linux
+
+package webview
+
+import "path/filepath"
+
+// conversionMemory 未提供系统内存探测时仅按并行数调度
+var conversionMemory func() int64
+
+// instanceDirectory 解析数据目录的实际路径
+// 入参: path 数据目录路径
+// 返回: string 规范路径, error 路径解析错误
+func instanceDirectory(path string) (string, error) {
+	return filepath.EvalSymlinks(path)
+}
+
+// fontNameLanguage 未指定系统显示语言时沿用字体名称表顺序
+// 返回: uint16 未指定平台标识, uint16 未指定语言标识
+func fontNameLanguage() (uint16, uint16) {
+	return 0xffff, 0xffff
+}

internal/webview/webview_theme.go

@@ -0,0 +1,130 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !js || !wasm
+
+package webview
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/xiaoqidun/guigo"
+	webuiassets "github.com/xiaoqidun/ofdgo/assets/webui"
+)
+
+// applicationTheme 保存应用主题偏好及最后一次解析的系统外观
+type applicationTheme struct {
+	Mode string `json:"mode"`
+	Dark bool   `json:"dark"`
+}
+
+// themeColors 返回应用对应外观的原生标题栏配色
+// 入参: dark 是否使用深色
+// 返回: guigo.TitleBarColors 标题栏配色
+func themeColors(dark bool) guigo.TitleBarColors {
+	if dark {
+		return guigo.TitleBarColors{Background: "#20272b", Foreground: "#e0e7eb", InactiveBackground: "#242b30", InactiveForeground: "#9aa8b1"}
+	}
+	return guigo.TitleBarColors{Background: "#e8edee", Foreground: "#263238", InactiveBackground: "#eef1f3", InactiveForeground: "#728087"}
+}
+
+// loadTheme 在创建窗口前读取用户目录中的主题偏好
+// 返回: error 读取或解析错误
+func (h *Host) loadTheme() error {
+	h.theme = applicationTheme{Mode: "system"}
+	data, err := os.ReadFile(h.themePath)
+	if os.IsNotExist(err) {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+	if err := json.Unmarshal(data, &h.theme); err != nil {
+		return err
+	}
+	return h.theme.validate()
+}
+
+// validate 检查应用主题及解析后的配色是否一致
+// 返回: error 偏好错误
+func (a applicationTheme) validate() error {
+	if a.Mode != "system" && a.Mode != "light" && a.Mode != "dark" {
+		return fmt.Errorf("主题无效")
+	}
+	if a.Mode == "light" && a.Dark || a.Mode == "dark" && !a.Dark {
+		return fmt.Errorf("主题配色无效")
+	}
+	return nil
+}
+
+// themeIndex 在页面首次绘制前提供当前主题偏好
+// 返回: []byte 页面内容, error 资源读取错误
+func (h *Host) themeIndex() ([]byte, error) {
+	data, err := webuiassets.NativeFS.ReadFile("index.html")
+	if err != nil {
+		return nil, err
+	}
+	h.themeMu.Lock()
+	mode := h.theme.Mode
+	h.themeMu.Unlock()
+	if mode == "" {
+		mode = "system"
+	}
+	return bytes.Replace(data, []byte(`<html lang="zh-CN">`), []byte(`<html lang="zh-CN" data-theme-mode="`+mode+`">`), 1), nil
+}
+
+// setTheme 串行保存应用偏好并同步当前窗口配色
+// 入参: value 已解析的主题偏好
+// 返回: error 校验、持久化或窗口更新错误
+func (h *Host) setTheme(value applicationTheme) error {
+	if err := value.validate(); err != nil {
+		return err
+	}
+	h.themeMu.Lock()
+	defer h.themeMu.Unlock()
+	h.mu.Lock()
+	window := h.window
+	h.mu.Unlock()
+	if window == nil {
+		return fmt.Errorf("窗口尚未就绪")
+	}
+	if h.theme != value {
+		data, err := json.Marshal(value)
+		if err != nil {
+			return err
+		}
+		file, err := os.CreateTemp(filepath.Dir(h.themePath), "appearance-*")
+		if err != nil {
+			return err
+		}
+		defer os.Remove(file.Name())
+		_, writeErr := file.Write(data)
+		closeErr := file.Close()
+		if writeErr != nil {
+			return writeErr
+		}
+		if closeErr != nil {
+			return closeErr
+		}
+		if err := os.Rename(file.Name(), h.themePath); err != nil {
+			return err
+		}
+		h.theme = value
+	}
+	return window.SetTitleBarColors(themeColors(value.Dark))
+}

internal/webview/webview_windows.go

@@ -0,0 +1,78 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package webview
+
+import (
+	"os"
+	"strings"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+// memoryStatusProc 查询系统物理内存和提交额度
+var memoryStatusProc = syscall.NewLazyDLL("kernel32.dll").NewProc("GlobalMemoryStatusEx")
+
+// instanceDirectory 解析数据目录的实际路径，使目录联接及大小写别名复用同一实例
+// 入参: path 数据目录路径
+// 返回: string 规范路径, error 路径解析错误
+func instanceDirectory(path string) (string, error) {
+	dir, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer dir.Close()
+	buffer := make([]uint16, 256)
+	for {
+		n, err := windows.GetFinalPathNameByHandle(windows.Handle(dir.Fd()), &buffer[0], uint32(len(buffer)), 0)
+		if err != nil {
+			return "", err
+		}
+		if n < uint32(len(buffer)) {
+			return strings.ToLower(windows.UTF16ToString(buffer[:n])), nil
+		}
+		buffer = make([]uint16, n+1)
+	}
+}
+
+// fontNameLanguage 获取系统显示语言对应的OpenType名称表标识
+// 返回: uint16 名称表平台标识, uint16 系统显示语言标识
+func fontNameLanguage() (uint16, uint16) {
+	language, _, _ := syscall.NewLazyDLL("kernel32.dll").NewProc("GetUserDefaultUILanguage").Call()
+	return 3, uint16(language)
+}
+
+// conversionMemory 预留系统内存后返回可用于新增转换的额度
+// 返回: int64 可用字节数，查询失败时暂停扩容
+func conversionMemory() int64 {
+	status := struct {
+		length           uint32
+		load             uint32
+		total            uint64
+		available        uint64
+		totalPage        uint64
+		availablePage    uint64
+		totalVirtual     uint64
+		availableVirtual uint64
+		extended         uint64
+	}{}
+	status.length = uint32(unsafe.Sizeof(status))
+	ok, _, _ := memoryStatusProc.Call(uintptr(unsafe.Pointer(&status)))
+	if ok == 0 {
+		return 0
+	}
+	return max(0, int64(min(status.available, status.availablePage))-int64(status.total/8))
+}

ofdgo.go

@@ -17,42 +17,267 @@ package ofdgo
 
 import (
 	"archive/zip"
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
 	"image"
 	"io"
 	"io/fs"
+	"os"
+	"runtime"
+	"sync"
+
+	basefile "github.com/xiaoqidun/ofdgo/internal/base/file"
 )
 
-// Open 打开OFD文件
+// Input 统一文件、内存及顺序流的随机读取，可并发读取和关闭，不可复制
-// 返回的阅读器持有文件，使用完毕后需调用Close
+// 调用方应在阅读、编辑及转换结束后调用Close，借入的数据需在此期间保持不变
-// 入参: path 文件路径, options 阅读选项
+// 借入的随机读取器应支持并发ReadAt，Close不会关闭调用方传入的读取器
-// 返回: *Reader 阅读器实例, error 错误信息
+type Input struct {
-func Open(path string, options ...ReaderOption) (*Reader, error) {
+	mu     sync.RWMutex
-	r, err := zip.OpenReader(path)
+	reader io.ReaderAt
-	if err != nil {
+	size   int64
-		return nil, err
+	path   string
-	}
+	file   *os.File
-	reader := &Reader{
+	temp   bool
-		Path:   path,
-		Zip:    &r.Reader,
-		Closer: r,
-	}
-	if err := reader.open(options); err != nil {
-		reader.Close()
-		return nil, err
-	}
-	return reader, nil
 }
 
-// NewReader 从IO读取器创建OFD阅读器
+// InputOptions 设置顺序输入的缓存及大小限制，单位为字节
-// 读取器的生命周期由调用方管理，Reader.Close不会关闭它
+// MemoryLimit为0时使用8MiB，浏览器WASM仅用内存；负值表示仅用内存
-// 入参: r IO读取器, size 数据大小, options 阅读选项
+// TempDir为空时使用系统临时目录，不自动创建调用方指定的目录
+// MaxSize为0时不限制输入大小，OpenFile和ReadInput均检查此限制
+// 无临时文件系统的平台可显式使用仅内存模式，并通过MaxSize限制输入
+type InputOptions struct {
+	MemoryLimit int64
+	MaxSize     int64
+	TempDir     string
+}
+
+// OpenFile 打开文件输入，不复制文件内容，Close释放文件句柄
+// 入参: ctx 取消上下文, path 文件路径, options 输入选项
+// 返回: *Input 输入源, error 打开或大小错误
+func OpenFile(ctx context.Context, path string, options InputOptions) (*Input, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	f, err := basefile.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	info, err := f.Stat()
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	if !info.Mode().IsRegular() {
+		f.Close()
+		return nil, fmt.Errorf("input is not a regular file")
+	}
+	input, err := NewInput(f, info.Size())
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	input.file, input.path = f, path
+	if err := input.checkOptions(ctx, options); err != nil {
+		input.Close()
+		return nil, err
+	}
+	return input, nil
+}
+
+// NewInput 借用指定长度的随机读取源，不复制数据或接管其生命周期
+// 入参: reader 随机读取器, size 数据大小
+// 返回: *Input 输入源, error 参数错误
+func NewInput(reader io.ReaderAt, size int64) (*Input, error) {
+	if reader == nil || size < 0 {
+		return nil, fmt.Errorf("invalid input")
+	}
+	return &Input{reader: reader, size: size}, nil
+}
+
+// ReadInput 从当前位置接收顺序输入，超过内存阈值后转入临时文件
+// 已知大小且支持随机访问的可定位读取器直接复用，不移动其当前位置
+// 不关闭传入流；取消无法中断阻塞的Read，调用方应自行设置超时或关闭流
+// 入参: ctx 取消上下文, reader 输入流, options 输入选项
+// 返回: *Input 输入源, error 读取、缓存或取消错误
+func ReadInput(ctx context.Context, reader io.Reader, options InputOptions) (*Input, error) {
+	if reader == nil || options.MaxSize < 0 {
+		return nil, fmt.Errorf("invalid input options")
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if random, ok := reader.(io.ReaderAt); ok {
+		if seeker, ok := reader.(io.Seeker); ok {
+			var size int64 = -1
+			if sized, ok := reader.(interface{ Size() int64 }); ok {
+				size = sized.Size()
+			} else if stated, ok := reader.(interface{ Stat() (os.FileInfo, error) }); ok {
+				info, err := stated.Stat()
+				if err != nil {
+					return nil, err
+				}
+				if info.Mode().IsRegular() {
+					size = info.Size()
+				}
+			}
+			if size >= 0 {
+				offset, err := seeker.Seek(0, io.SeekCurrent)
+				if err != nil {
+					return nil, err
+				}
+				if offset < 0 || offset > size {
+					return nil, fmt.Errorf("invalid input offset")
+				}
+				input, err := NewInput(io.NewSectionReader(random, offset, size-offset), size-offset)
+				if err != nil {
+					return nil, err
+				}
+				if err := input.checkOptions(ctx, options); err != nil {
+					return nil, err
+				}
+				return input, nil
+			}
+		}
+	}
+	limit := options.MemoryLimit
+	if limit == 0 {
+		limit = 8 << 20
+		if runtime.GOOS == "js" {
+			limit = -1
+		}
+	}
+	input := &Input{}
+	success := false
+	defer func() {
+		if !success {
+			input.Close()
+		}
+	}()
+	var memory bytes.Buffer
+	buffer := make([]byte, 64<<10)
+	empty := 0
+	for {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		n, err := reader.Read(buffer)
+		if n < 0 || n > len(buffer) {
+			return nil, fmt.Errorf("invalid input read count")
+		}
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+		if failure := ctx.Err(); failure != nil {
+			return nil, failure
+		}
+		if n > 0 {
+			empty = 0
+			if input.size > int64(^uint64(0)>>1)-int64(n) || options.MaxSize > 0 && int64(n) > options.MaxSize-input.size {
+				return nil, fmt.Errorf("input exceeds size limit")
+			}
+			if input.file == nil && limit >= 0 && input.size+int64(n) > limit {
+				file, failure := basefile.NewTemp(options.TempDir)
+				if failure != nil {
+					return nil, failure
+				}
+				input.file, input.temp = file, true
+				if _, failure = file.Write(memory.Bytes()); failure != nil {
+					return nil, failure
+				}
+				memory = bytes.Buffer{}
+			}
+			var output io.Writer = &memory
+			if input.file != nil {
+				output = input.file
+			}
+			if _, failure := output.Write(buffer[:n]); failure != nil {
+				return nil, failure
+			}
+			input.size += int64(n)
+		} else if err == nil {
+			empty++
+			if empty >= 100 {
+				return nil, io.ErrNoProgress
+			}
+		}
+		if err != nil {
+			break
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	input.reader = bytes.NewReader(memory.Bytes())
+	if input.file != nil {
+		input.reader = input.file
+	}
+	success = true
+	return input, nil
+}
+
+// checkOptions 检查取消状态及输入大小
+// 入参: ctx 取消上下文, options 输入选项
+// 返回: error 取消或大小错误
+func (s *Input) checkOptions(ctx context.Context, options InputOptions) error {
+	if options.MaxSize < 0 || options.MaxSize > 0 && s.size > options.MaxSize {
+		return fmt.Errorf("input exceeds size limit")
+	}
+	return ctx.Err()
+}
+
+// Size 返回输入字节数，关闭后仍可查询
+// 返回: int64 数据大小
+func (s *Input) Size() int64 {
+	return s.size
+}
+
+// ReadAt 读取指定位置的数据，关闭后返回os.ErrClosed
+// 入参: data 目标缓冲区, offset 字节偏移
+// 返回: int 读取字节数, error 读取错误
+func (s *Input) ReadAt(data []byte, offset int64) (int, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	if s.reader == nil {
+		return 0, os.ErrClosed
+	}
+	return io.NewSectionReader(s.reader, 0, s.size).ReadAt(data, offset)
+}
+
+// Close 释放自有文件和缓存，等待正在进行的读取结束，可重复调用
+// 返回: error 文件关闭或临时文件删除错误
+func (s *Input) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.reader = nil
+	if s.file == nil {
+		return nil
+	}
+	file := s.file
+	s.file = nil
+	err := file.Close()
+	if s.temp {
+		err = errors.Join(err, os.Remove(file.Name()))
+	}
+	return err
+}
+
+// NewReader 从统一输入源创建OFD阅读器，不接管输入源生命周期
+// 阅读器及其派生编辑器使用结束后，调用方再关闭输入源
+// 入参: input 输入源, options 阅读选项
 // 返回: *Reader 阅读器实例, error 错误信息
-func NewReader(r io.ReaderAt, size int64, options ...ReaderOption) (*Reader, error) {
+func NewReader(input *Input, options ...ReaderOption) (*Reader, error) {
-	zr, err := zip.NewReader(r, size)
+	if input == nil {
+		return nil, fmt.Errorf("missing input")
+	}
+	zr, err := zip.NewReader(input, input.Size())
 	if err != nil {
 		return nil, err
 	}
 	reader := &Reader{
+		Path: input.path,
 		Zip:  zr,
 	}
 	if err := reader.open(options); err != nil {
@@ -65,6 +290,9 @@ func NewReader(r io.ReaderAt, size int64, options ...ReaderOption) (*Reader, err
 // 入参: reader 阅读器, opts 渲染选项
 // 返回: *Renderer 渲染器实例
 func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
+	if reader.resources == nil {
+		reader.resources, _ = NewResources(ResourceOptions{})
+	}
 	r := &Renderer{
 		Reader:                reader,
 		DPI:                   300.0,
@@ -72,7 +300,7 @@ func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
 		DrawParams:            reader.drawParamCache,
 		CompositeGraphicUnits: reader.compositeGraphicUnitCache,
 		templatePageCache:     make(map[string]*PageContent),
-		imageCache:            &renderCache[string, image.Image]{limit: imageCacheLimit},
+		imageCache:            resourceCache[string, image.Image](reader.resources, imageCacheLimit),
 		backends:              defaultRenderBackends(),
 		backendStates:         make(map[any]any),
 	}

ofdgo_annot.go

@@ -276,7 +276,7 @@ func (r *Reader) parseAnnotations(ctx context.Context, doc *Document) error {
 			continue
 		}
 		var pageAnnot PageAnnot
-		err = xml.NewDecoder(imageInput{ReadCloser: af, context: ctx}).Decode(&pageAnnot)
+		err = xml.NewDecoder(imageInput{ReadCloser: af, ctx: ctx}).Decode(&pageAnnot)
 		_ = af.Close()
 		if err != nil {
 			continue
@@ -310,7 +310,7 @@ func (r *Reader) annotationIndexContext(ctx context.Context, doc *Document) (Ann
 	}
 	defer f.Close()
 	var annotations Annotations
-	if err := xml.NewDecoder(imageInput{ReadCloser: f, context: ctx}).Decode(&annotations); err != nil {
+	if err := xml.NewDecoder(imageInput{ReadCloser: f, ctx: ctx}).Decode(&annotations); err != nil {
 		return Annotations{}, err
 	}
 	pageIDs := make(map[string]string, len(doc.Pages.Page))

ofdgo_archive.go

@@ -28,8 +28,7 @@ import (
 // ArchiveFile 描述已生成的归档文件，不关闭调用方提供的源读取器
 type ArchiveFile struct {
 	Name  string
-	Source io.ReaderAt
+	Input *Input
-	Size   int64
 }
 
 // ArchiveOptions 设置ZIP封装，压缩不重新编码归档内已生成的文档
@@ -47,13 +46,13 @@ func WriteArchive(ctx context.Context, writer io.Writer, files []ArchiveFile, op
 	}
 	names := map[string]bool{}
 	for _, file := range files {
-		if !fs.ValidPath(file.Name) || file.Name == "." || strings.Contains(file.Name, "\\") || names[file.Name] || file.Source == nil || file.Size < 0 {
+		if !fs.ValidPath(file.Name) || file.Name == "." || strings.Contains(file.Name, "\\") || names[file.Name] || file.Input == nil {
 			return 0, fmt.Errorf("invalid archive file %q", file.Name)
 		}
 		names[file.Name] = true
 	}
 	var count int64
-	archive := zip.NewWriter(convertWriter{context: ctx, writer: writer, count: &count})
+	archive := zip.NewWriter(convertWriter{ctx: ctx, writer: writer, count: &count})
 	configureArchive(archive, options.Compression)
 	var buffer []byte
 	for i, file := range files {
@@ -77,15 +76,15 @@ func WriteArchive(ctx context.Context, writer io.Writer, files []ArchiveFile, op
 		if err != nil {
 			return count, err
 		}
-		input := convertReader{context: ctx, source: file.Source}
+		input := convertReader{ctx: ctx, input: file.Input}
 		if buffer == nil {
 			buffer = make([]byte, 32<<10)
 		}
-		written, err := io.CopyBuffer(entry, io.NewSectionReader(input, 0, file.Size), buffer)
+		written, err := io.CopyBuffer(entry, io.NewSectionReader(input, 0, file.Input.Size()), buffer)
 		if err != nil {
 			return count, err
 		}
-		if written != file.Size {
+		if written != file.Input.Size() {
 			return count, io.ErrUnexpectedEOF
 		}
 	}

ofdgo_compression.go

@@ -70,6 +70,7 @@ type outputOptimization struct {
 	protected bool
 	completed int
 	deflater  *flate.Writer
+	resources *editorResourceSelection
 }
 
 // outputCompressionBuffer 限制候选ZIP编码，不能缩小时终止本次压缩
@@ -99,13 +100,16 @@ func (e *Editor) WriteToWithOptions(ctx context.Context, writer io.Writer, optio
 		return 0, err
 	}
 	var count int64
-	return snapshot.WriteTo(convertWriter{context: ctx, writer: writer, count: &count})
+	return snapshot.WriteTo(convertWriter{ctx: ctx, writer: writer, count: &count})
 }
 
-// WritePagesToWithOptions 按指定顺序另存页面，仅为所选页面准备资源和压缩计划
+// WritePagesTo 按指定顺序另存页面，仅为所选页面准备资源和压缩计划
+// 保留关联资源、目录、注释和签章外观，生成新文档标识，不改变原文档和撤销记录
+// 签章外观不代表原签名在导出文档中仍有效，页码不可重复或为空
 // 入参: ctx 取消上下文, writer 输出流, indexes 零基页码, options 输出配置
 // 返回: int64 已写入字节数, error 错误信息
-func (e *Editor) WritePagesToWithOptions(ctx context.Context, writer io.Writer, indexes []int, options WriteOptions) (int64, error) {
+func (e *Editor) WritePagesTo(ctx context.Context, writer io.Writer, indexes []int, options WriteOptions) (int64, error) {
+	ctx = e.runtimeResources.context(ctx)
 	if err := ctx.Err(); err != nil {
 		return 0, err
 	}
@@ -116,13 +120,14 @@ func (e *Editor) WritePagesToWithOptions(ctx context.Context, writer io.Writer,
 	snapshot.OnWriteProgress = editorProgress(e.OnWriteProgress).withContext(ctx)
 	snapshot.output = &outputOptimization{ctx: ctx, options: options.Compression}
 	var count int64
-	return snapshot.WritePagesTo(convertWriter{context: ctx, writer: writer, count: &count}, indexes)
+	return snapshot.writePagesTo(convertWriter{ctx: ctx, writer: writer, count: &count}, indexes)
 }
 
 // outputSnapshot 创建只读输出配置，原签名存在时仅调整ZIP封装
 // 入参: ctx 取消上下文, options 输出配置
 // 返回: *Editor 输出快照, error 配置或资源错误
 func (e *Editor) outputSnapshot(ctx context.Context, options WriteOptions) (*Editor, error) {
+	ctx = e.runtimeResources.context(ctx)
 	if err := ctx.Err(); err != nil {
 		return nil, err
 	}
@@ -130,12 +135,7 @@ func (e *Editor) outputSnapshot(ctx context.Context, options WriteOptions) (*Edi
 		return nil, err
 	}
 	snapshot := *e
-	snapshot.OnWriteProgress = func(stage string, completed, total int) error {
+	snapshot.OnWriteProgress = editorProgress(e.OnWriteProgress).withContext(ctx)
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		return editorProgress(e.OnWriteProgress).report(stage, completed, total)
-	}
 	snapshot.output = &outputOptimization{ctx: ctx, options: options.Compression}
 	if options.Compression.Mode == CompressionUnchanged {
 		return &snapshot, nil
@@ -216,7 +216,7 @@ func (r *Reader) compressionImageSafety(ctx context.Context, images []ImageInfo)
 		if err != nil {
 			return nil, false, err
 		}
-		buffer := bufio.NewReader(imageInput{ReadCloser: input, context: ctx})
+		buffer := bufio.NewReader(imageInput{ReadCloser: input, ctx: ctx})
 		found, err := editorXMLPrefix(buffer)
 		if err != nil || !found && (structured || strings.EqualFold(path.Ext(name), ".xml")) {
 			safe = false
@@ -437,7 +437,7 @@ func (e *Editor) compressOutputFile(file *zip.File, buffer []byte, limit int) ([
 		deflater.Reset(output)
 	}
 	defer deflater.Close()
-	source := imageInput{ReadCloser: input, context: e.output.ctx}
+	source := imageInput{ReadCloser: input, ctx: e.output.ctx}
 	_, err = io.CopyBuffer(deflater, source, buffer)
 	if output.exceeded {
 		_, err = io.CopyBuffer(io.Discard, source, buffer)
@@ -547,7 +547,7 @@ func (e *Editor) writeOutputFile(archive *zip.Writer, file *zip.File, buffer []b
 	if err != nil {
 		return err
 	}
-	if _, err := io.CopyBuffer(entry, imageInput{ReadCloser: io.NopCloser(payload), context: e.output.ctx}, buffer); err != nil {
+	if _, err := io.CopyBuffer(entry, imageInput{ReadCloser: io.NopCloser(payload), ctx: e.output.ctx}, buffer); err != nil {
 		return err
 	}
 	e.output.completed++

ofdgo_compression_fonts.go

@@ -1,110 +0,0 @@
-// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ofdgo
-
-import (
-	"context"
-	"encoding/xml"
-	"strings"
-)
-
-// compressionFontUsage 按文档合并共享字体用字，版本编辑仅统计选中入口
-// 入参: ctx 取消上下文, documents 文档入口, resources 资源索引, references 各文件引用, read 输出文件读取方法
-// 返回: map[string]*editorFontUsage 各字体文件的用字，无法确定作用域时为空, error 读取或取消错误
-func (r *Reader) compressionFontUsage(ctx context.Context, documents map[string]bool, resources []string, references map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
-	selected := ""
-	if r.OFD.DocBody[r.documentIndex].versioned {
-		var err error
-		selected, err = r.DocumentRootContext(ctx)
-		if err != nil {
-			return nil, err
-		}
-	}
-	scoped, err := resourceReferenceScopes(ctx, documents, resources, references, selected)
-	if err != nil || scoped == nil {
-		return nil, err
-	}
-	return resourceFontUsage(ctx, resources, scoped, read)
-}
-
-// resourceFontUsage 按已确认的文档作用域合并各字体文件的字符和字形引用
-// 入参: ctx 取消上下文, resources 资源索引, scoped 各索引的用字范围, read 输出文件读取方法
-// 返回: map[string]*editorFontUsage 各字体文件的用字, error 读取或取消错误
-func resourceFontUsage(ctx context.Context, resources []string, scoped map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
-	result := make(map[string]*editorFontUsage)
-	protected := make(map[string]bool)
-	for _, name := range resources {
-		if err := ctx.Err(); err != nil {
-			return nil, err
-		}
-		refs := scoped[name]
-		if refs == nil {
-			continue
-		}
-		data, err := read(name)
-		if err != nil {
-			return nil, err
-		}
-		root, err := parseEditorXMLContext(ctx, data)
-		if err != nil {
-			return nil, err
-		}
-		for font := range editorResourceNodes(root, "Fonts", "Font") {
-			if err := ctx.Err(); err != nil {
-				return nil, err
-			}
-			file := font.child("FontFile")
-			if file == nil {
-				continue
-			}
-			var value string
-			if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
-				return nil, err
-			}
-			location := editorResourceLocation(name, root.attr("BaseLoc"), value)
-			alternate := cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))
-			id, charset := editorResourceID(font.attr("ID")), font.attr("Charset")
-			unsafe := id == "" || charset != "" && !strings.EqualFold(charset, "unicode") || location != alternate
-			for i, path := range [2]string{location, alternate} {
-				if i == 1 && path == location {
-					continue
-				}
-				if result[path] == nil {
-					result[path] = newEditorFontUsage()
-				}
-				result[path].merge(refs.fonts[id], unsafe)
-			}
-		}
-		for media := range editorResourceNodes(root, "MultiMedias", "MultiMedia") {
-			file := media.child("MediaFile")
-			if file == nil {
-				continue
-			}
-			var value string
-			if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
-				return nil, err
-			}
-			for _, location := range []string{editorResourceLocation(name, root.attr("BaseLoc"), value), cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))} {
-				protected[location] = true
-			}
-		}
-	}
-	for location := range protected {
-		if usage := result[location]; usage != nil {
-			usage.unsafe = true
-		}
-	}
-	return result, ctx.Err()
-}

ofdgo_compression_images.go

@@ -15,10 +15,17 @@
 package ofdgo
 
 import (
+	"bytes"
 	"context"
+	"encoding/binary"
+	"errors"
 	"fmt"
 	"image"
+	"io"
 	"math"
+
+	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
+	"github.com/xiaoqidun/pdfgo"
 )
 
 // compressionPatternImageLimit 限制底纹尺寸分析的变换组合数，超限时保留原图尺寸
@@ -397,3 +404,173 @@ func (v *compressionImages) patternImages(color *FillColor, object Matrix) error
 	}
 	return nil
 }
+
+// outputImageFormat 识别可由资源压缩生成的图片格式
+// 入参: data 图片编码
+// 返回: string 标准资源格式，未识别时为空
+func outputImageFormat(data []byte) string {
+	if baseimage.IsJPEG(data) {
+		return "JPEG"
+	}
+	if baseimage.IsPNG(data) {
+		return "PNG"
+	}
+	return ""
+}
+
+// optimizeImageResource 优化可完整保留的BMP及TIFF，复用图像压缩和降采样策略
+// 原始模式及无法保留的色彩配置不转换，仅采用小于原始编码的结果
+// 入参: ctx 取消上下文, data 图片编码, options 压缩选项, size 像素需求
+// 返回: []byte 图片编码，可能引用输入, error 解码、编码或取消错误
+func optimizeImageResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
+	if err := options.Validate(); err != nil {
+		return nil, err
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if options.Mode != CompressionUnchanged && baseimage.IsTIFF(data) {
+		return optimizeTIFFResource(ctx, data, options, size)
+	}
+	if options.Mode == CompressionUnchanged || !bytes.HasPrefix(data, []byte("BM")) {
+		return pdfgo.OptimizeImageResource(ctx, data, options, size)
+	}
+	return optimizeBMPResource(ctx, data, options, size)
+}
+
+// optimizeBMPResource 压缩可保留色彩与密度的位图，未知元数据及高精度位域保持原样
+// 入参: ctx 取消上下文, data BMP编码, options 压缩选项, size 像素需求
+// 返回: []byte 图片编码, error 解码、编码或取消错误
+func optimizeBMPResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
+	offset, width, height, depth, compression, err := baseimage.ParseBMPHeader(data)
+	if err != nil {
+		return data, nil
+	}
+	if height < 0 {
+		height = -height
+	}
+	if int64(width)*int64(height) > outputOptimizationBufferLimit/4 || compression != 0 && compression != 3 {
+		return data, nil
+	}
+	header := binary.LittleEndian.Uint32(data[14:18])
+	if header != 40 && header != 108 && header != 124 {
+		return data, nil
+	}
+	if header >= 108 && binary.LittleEndian.Uint32(data[70:74]) != 0x73524742 {
+		return data, nil
+	}
+	if header == 124 && (binary.LittleEndian.Uint32(data[122:126]) != 0 || binary.LittleEndian.Uint32(data[126:130]) != 0 || binary.LittleEndian.Uint32(data[130:134]) != 0) {
+		return data, nil
+	}
+	stride := (int64(width)*int64(depth) + 31) / 32 * 4
+	if int64(offset)+stride*int64(height) != int64(len(data)) {
+		return data, nil
+	}
+	density, ok := baseimage.BMPDensity(data)
+	if !ok {
+		return data, nil
+	}
+	if depth == 16 || depth == 32 {
+		masks, err := baseimage.BMPColorMasks(data, offset, depth, compression)
+		if err != nil {
+			return data, nil
+		}
+		if options.Mode == CompressionLossless {
+			for _, mask := range masks {
+				if mask.Max > 255 {
+					return data, nil
+				}
+			}
+		}
+	}
+	var pixels image.Image
+	if depth == 16 || compression == 3 {
+		pixels, err = baseimage.DecodeBMPContext(ctx, data)
+	} else {
+		pixels, _, err = image.Decode(imageInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), ctx: ctx})
+	}
+	if err != nil {
+		return nil, err
+	}
+	return optimizeRasterResource(ctx, data, pixels, options, size, density)
+}
+
+// optimizeRasterResource 编码已解码的资源图片，同步降采样后的像素密度，仅采用更小结果
+// 先降采样再编码，绝对密度按最终尺寸量化，相对密度保留精确比例
+// 有密度时保留PNG，未知密度按最终像素选择编码格式
+// 入参: ctx 取消上下文, data 原编码, pixels 像素, options 压缩选项, size 像素需求, density 像素密度
+// 返回: []byte 图片编码, error 编码或取消错误
+func optimizeRasterResource(ctx context.Context, data []byte, pixels image.Image, options CompressionOptions, size image.Point, density baseimage.Density) ([]byte, error) {
+	hasDensity := density.X != 0 || density.Y != 0
+	before := pixels.Bounds().Size()
+	if options.Mode == CompressionLossy {
+		var err error
+		pixels, err = pdfgo.ResizeImage(ctx, pixels, size)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var ok bool
+	density, ok = density.Scale(before, pixels.Bounds().Size())
+	if !ok {
+		return data, ctx.Err()
+	}
+	var candidate []byte
+	var err error
+	if hasDensity {
+		var encoded bytes.Buffer
+		err = pdfgo.EncodePNGWithOptions(ctx, &encoded, pixels, options)
+		candidate = encoded.Bytes()
+	} else {
+		candidate, err = pdfgo.EncodeImageResource(ctx, pixels, options)
+	}
+	if err != nil {
+		if errors.Is(err, io.ErrShortBuffer) {
+			return data, ctx.Err()
+		}
+		return nil, err
+	}
+	if hasDensity {
+		if len(candidate) > outputOptimizationBufferLimit-baseimage.PNGDensityChunkSize {
+			return data, ctx.Err()
+		}
+		candidate, ok = baseimage.WithPNGDensity(candidate, density)
+		if !ok {
+			return data, ctx.Err()
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if len(candidate) < len(data) {
+		return candidate, nil
+	}
+	return data, nil
+}
+
+// optimizeTIFFResource 压缩单目录TIFF，保留方向、透明度、采样精度及像素密度
+// 主图或单个瓦片的预计缓冲超限时保留原编码
+// 入参: ctx 取消上下文, data TIFF编码, options 压缩选项, size 显示像素需求
+// 返回: []byte 图片编码，不可完整转换时保留原文, error 编码或取消错误
+func optimizeTIFFResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
+	layout, err := baseimage.ReadTIFFLayoutContext(ctx, bytes.NewReader(data))
+	if err != nil {
+		return data, ctx.Err()
+	}
+	pixelSize := int64(layout.DecodedPixelBytes())
+	if int64(layout.Width) > outputOptimizationBufferLimit/pixelSize/int64(layout.Height) {
+		return data, ctx.Err()
+	}
+	if layout.TileWidth != 0 && int64(layout.TileWidth) > outputOptimizationBufferLimit/pixelSize/int64(layout.TileHeight) {
+		return data, ctx.Err()
+	}
+	density, ok := baseimage.TIFFConversionDensity(data, layout)
+	if !ok {
+		return data, ctx.Err()
+	}
+	pixels, err := baseimage.DecodeTIFF(ctx, data, layout)
+	if err != nil {
+		return data, ctx.Err()
+	}
+	return optimizeRasterResource(ctx, data, pixels, options, size, density)
+}

ofdgo_compression_parallel.go

@@ -20,22 +20,19 @@ import (
 	"crypto/sha256"
 	"image"
 	"io"
-	"runtime"
 	"sync"
 
 	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
 )
 
-// outputImageBatchLimit 限制并行批次持有的原始编码，超限图片单独处理
+// outputImageWorkingSetLimit 指定未提供任务预算时的图像成本估算上限
-const outputImageBatchLimit = 16 << 20
+const outputImageWorkingSetLimit = 256 << 20
-
-// outputImageWorkingSetLimit 限制并行批次的像素工作量估算，超限图片单独处理
-const outputImageWorkingSetLimit = 64 << 20
 
 // outputImageJob 保存独立图片任务，不访问编辑文档或调用进度回调
 type outputImageJob struct {
 	key        outputImageKey
 	data       []byte
+	workingSet int
 	candidate  []byte
 	err        error
 }
@@ -46,6 +43,21 @@ type outputImageSource struct {
 	format string
 }
 
+// outputImageContext 保留调用方取消检查并支持提前结束并行任务
+type outputImageContext struct {
+	context.Context
+	parent context.Context
+}
+
+// Err 检查调用方及本次任务的取消状态
+// 返回: error 取消错误
+func (c outputImageContext) Err() error {
+	if err := c.Context.Err(); err != nil {
+		return err
+	}
+	return c.parent.Err()
+}
+
 // outputImageOptions 统一资源压缩及像素需求，受保护图片只进行无损编码
 // 入参: key 资源路径
 // 返回: CompressionOptions 实际策略, image.Point 像素需求
@@ -62,35 +74,70 @@ func (e *Editor) outputImageOptions(key string) (CompressionOptions, image.Point
 	return options, demand
 }
 
-// prepareOutputImages 有界并行优化独立图片，读取、缓存及进度仍在调用线程处理
+// prepareOutputImages 有界并行优化独立图片，完成后补入任务，读取、缓存及进度保持串行
 // 入参: keys 资源路径, load 串行读取方法，空值表示跳过, results 候选缓存, sources 原始资源摘要，可为空
 // 返回: error 读取、进度或取消错误
 func (e *Editor) prepareOutputImages(keys []string, load func(string) ([]byte, error), results map[outputImageKey][]byte, sources map[string]outputImageSource) error {
-	workers := min(2, runtime.GOMAXPROCS(0))
+	workers := conversionWorkers(e.output.ctx)
 	if workers < 2 || len(keys) < 2 {
 		return nil
 	}
-	batch := make([]outputImageJob, 0, workers)
+	limit := int(min(int64(workers)*(64<<20), int64(int(^uint(0)>>1)-1)))
-	size, workingSet := 0, 0
+	encodedLimit := limit
-	run := func() error {
+	if pool, _ := e.output.ctx.Value(conversionPoolKey{}).(*ConversionPool); pool != nil {
-		if err := e.runOutputImages(batch, results); err != nil {
+		available := pool.memoryLimit()
+		if available == 0 {
+			return nil
+		}
+		if available > 0 {
+			limit = int(min(available, int64(int(^uint(0)>>1))))
+			encodedLimit = limit
+		}
+	}
+	base, cancel := context.WithCancel(e.output.ctx)
+	ctx := outputImageContext{Context: base, parent: e.output.ctx}
+	var group sync.WaitGroup
+	defer func() {
+		cancel()
+		group.Wait()
+	}()
+	completed := make(chan outputImageJob, workers)
+	pending := make(map[outputImageKey]bool)
+	running, size, workingSet := 0, 0, 0
+	finish := func() error {
+		job := <-completed
+		running--
+		size -= len(job.data)
+		workingSet -= job.workingSet
+		delete(pending, job.key)
+		if err := e.output.ctx.Err(); err != nil {
 			return err
 		}
-		clear(batch)
+		results[job.key] = nil
-		batch, size, workingSet = batch[:0], 0, 0
+		if job.err == nil && len(job.candidate) < len(job.data) {
+			results[job.key] = job.candidate
+		}
 		return nil
 	}
 	for _, key := range keys {
 		if err := e.output.ctx.Err(); err != nil {
 			return err
 		}
-		if err := editorProgress(e.OnWriteProgress).report("compress", e.output.completed, 0); err != nil {
+		for len(completed) != 0 || running == workers {
+			if err := finish(); err != nil {
+				return err
+			}
+		}
+		if err := editorProgress(e.OnWriteProgress).withContext(e.output.ctx).report("compress", e.output.completed, 0); err != nil {
 			return err
 		}
 		data, err := load(key)
 		if err != nil {
 			return err
 		}
+		if err := e.output.ctx.Err(); err != nil {
+			return err
+		}
 		if len(data) == 0 {
 			continue
 		}
@@ -102,54 +149,69 @@ func (e *Editor) prepareOutputImages(keys []string, load func(string) ([]byte, e
 		if _, cached := results[cacheKey]; cached {
 			continue
 		}
-		duplicate := false
+		if pending[cacheKey] {
-		for _, job := range batch {
-			duplicate = duplicate || job.key == cacheKey
-		}
-		if duplicate {
 			continue
 		}
-		cost := outputImageWorkingSet(e.output.ctx, data)
+		cost := imageWorkingSet(e.output.ctx, data, limit)
-		if len(batch) != 0 && (len(data) > outputImageBatchLimit-size || cost > outputImageWorkingSetLimit-workingSet) {
+		for running != 0 && (len(data) > encodedLimit-size || cost > limit-workingSet) {
-			if err := run(); err != nil {
+			if err := finish(); err != nil {
 				return err
 			}
 		}
-		batch = append(batch, outputImageJob{key: cacheKey, data: data})
+		job := outputImageJob{key: cacheKey, data: data, workingSet: cost}
+		if len(data) >= encodedLimit || cost >= limit {
+			if err := e.runOutputImages([]outputImageJob{job}, results); err != nil {
+				return err
+			}
+			continue
+		}
+		pending[cacheKey] = true
+		running++
 		size += len(data)
 		workingSet += cost
-		if len(batch) == workers || size >= outputImageBatchLimit || workingSet >= outputImageWorkingSetLimit {
+		group.Go(func() {
-			if err := run(); err != nil {
+			job.candidate, job.err = optimizeOutputImage(ctx, job)
+			completed <- job
+		})
+	}
+	for running != 0 {
+		if err := finish(); err != nil {
 			return err
 		}
 	}
-	}
+	return e.output.ctx.Err()
-	return run()
 }
 
 // outputImageWorkingSet 按原图尺寸估算解码和重采样缓冲，不以降采样目标代替原图
 // 通常预留两份16位RGBA缓冲，TIFF另计分量、瓦片及蒙版存储；格式或尺寸不明时单独处理
 // 入参: ctx 取消上下文, data 原始图像编码
-// 返回: int 编码及像素缓冲的估算字节数，上限为单批预算
+// 返回: int 编码及像素缓冲的估算字节数，上限为outputImageWorkingSetLimit
 func outputImageWorkingSet(ctx context.Context, data []byte) int {
-	if len(data) >= outputImageWorkingSetLimit {
+	return imageWorkingSet(ctx, data, outputImageWorkingSetLimit)
-		return outputImageWorkingSetLimit
+}
+
+// imageWorkingSet 按当前预算估算图像解码工作量
+// 入参: ctx 取消上下文, data 图像编码, limit 估算上限
+// 返回: int 工作量字节数
+func imageWorkingSet(ctx context.Context, data []byte, limit int) int {
+	if len(data) >= limit {
+		return limit
 	}
 	input := bytes.NewReader(data)
-	available := outputImageWorkingSetLimit - len(data)
+	available := limit - len(data)
 	if baseimage.IsTIFF(data) {
 		layout, err := baseimage.ReadTIFFLayoutContext(ctx, input)
 		if err != nil {
-			return outputImageWorkingSetLimit
+			return limit
 		}
 		return len(data) + tiffImageWorkingSet(layout, available)
 	}
-	config, _, err := baseimage.DecodeConfig(imageInput{ReadCloser: io.NopCloser(input), context: ctx})
+	config, _, err := baseimage.DecodeConfig(imageInput{ReadCloser: io.NopCloser(input), ctx: ctx})
 	if err != nil || config.Width <= 0 || config.Height <= 0 {
-		return outputImageWorkingSetLimit
+		return limit
 	}
 	if config.Width > available/16/config.Height {
-		return outputImageWorkingSetLimit
+		return limit
 	}
 	return len(data) + config.Width*config.Height*16
 }
@@ -187,7 +249,7 @@ func tiffImageWorkingSet(layout baseimage.TIFFLayout, limit int) int {
 func (e *Editor) runOutputImages(jobs []outputImageJob, results map[outputImageKey][]byte) error {
 	ctx := e.output.ctx
 	optimize := func(job *outputImageJob) {
-		job.candidate, job.err = optimizeImageResource(ctx, job.data, job.key.options, job.key.size)
+		job.candidate, job.err = optimizeOutputImage(ctx, *job)
 	}
 	if len(jobs) == 1 {
 		optimize(&jobs[0])
@@ -209,3 +271,23 @@ func (e *Editor) runOutputImages(jobs []outputImageJob, results map[outputImageK
 	}
 	return nil
 }
+
+// optimizeOutputImage 在共享预算内优化独立图像
+// 入参: ctx 转换上下文, job 图像任务
+// 返回: []byte 候选编码, error 转换错误
+func optimizeOutputImage(ctx context.Context, job outputImageJob) ([]byte, error) {
+	if pool, _ := ctx.Value(conversionPoolKey{}).(*ConversionPool); pool != nil {
+		if job.workingSet == 0 {
+			limit := outputImageWorkingSetLimit
+			if available := pool.memoryLimit(); available > 0 {
+				limit = int(min(available, int64(int(^uint(0)>>1))))
+			}
+			job.workingSet = imageWorkingSet(ctx, job.data, limit)
+		}
+		if err := pool.acquire(ctx, true, int64(job.workingSet)); err != nil {
+			return nil, err
+		}
+		defer pool.release(true, int64(job.workingSet))
+	}
+	return optimizeImageResource(ctx, job.data, job.key.options, job.key.size)
+}

ofdgo_compression_pattern.go

@@ -67,7 +67,7 @@ func (e *Editor) compressPatternPaints() error {
 				}
 				hash := sha256.New()
 				var size int64
-				x := newOFDXML(convertWriter{writer: hash, count: &size, context: e.output.ctx})
+				x := newOFDXML(convertWriter{writer: hash, count: &size, ctx: e.output.ctx})
 				x.ctx = e.output.ctx
 				x.color("FillColor", fill)
 				x.color("StrokeColor", (*FillColor)(stroke))

ofdgo_compression_profiles.go

@@ -1,136 +0,0 @@
-// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ofdgo
-
-import (
-	"context"
-	"fmt"
-	"maps"
-	"slices"
-)
-
-// editorProfileReference 记录颜色配置文件所在的资源索引及颜色空间标识
-type editorProfileReference struct {
-	index string
-	id    string
-}
-
-// compactResourceProfiles 合并相同颜色配置文件，保留颜色空间声明和独立文件引用
-// 入参: ctx 取消上下文, reader 原包，可为空, parts 输出改动, profiles 配置文件引用, protected 不可替换的文件, removed 待移除文件
-// 返回: error 读取、改写或取消错误
-func compactResourceProfiles(ctx context.Context, reader *Reader, parts map[string][]byte, profiles map[string][]editorProfileReference, protected, removed map[string]bool) error {
-	if len(profiles) < 2 {
-		return ctx.Err()
-	}
-	seen := make(map[[32]byte]string)
-	aliases := make(map[string]string)
-	indexes := make(map[string]map[string]string)
-	ordered := slices.Sorted(maps.Keys(profiles))
-	sizes := make(map[string]uint64, len(profiles))
-	counts := make(map[uint64]int)
-	for _, name := range ordered {
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		if protected[name] {
-			continue
-		}
-		size, err := outputResourceSize(reader, parts, name)
-		if err != nil {
-			return err
-		}
-		sizes[name] = size
-		counts[size]++
-	}
-	var buffer []byte
-	for _, name := range ordered {
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		if protected[name] || counts[sizes[name]] < 2 {
-			continue
-		}
-		if buffer == nil {
-			buffer = make([]byte, 32*1024)
-		}
-		key, err := outputResourceDigest(ctx, reader, parts, name, buffer)
-		if err != nil {
-			return err
-		}
-		first, found := seen[key]
-		if !found {
-			seen[key] = name
-			continue
-		}
-		aliases[name] = first
-		for _, reference := range profiles[name] {
-			if indexes[reference.index] == nil {
-				indexes[reference.index] = make(map[string]string)
-			}
-			indexes[reference.index][reference.id] = first
-		}
-	}
-	updates := make(map[string][]byte, len(indexes))
-	for _, name := range slices.Sorted(maps.Keys(indexes)) {
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		data, ok := parts[name]
-		if !ok {
-			if reader == nil {
-				return fmt.Errorf("file not found: %s", name)
-			}
-			var err error
-			data, err = reader.readFileViewContext(ctx, name)
-			if err != nil {
-				return err
-			}
-		}
-		root, err := parseEditorXMLContext(ctx, data)
-		if err != nil {
-			return err
-		}
-		var patches []editorXMLPatch
-		for _, group := range root.children {
-			if !group.matchesOFD("ColorSpaces") {
-				continue
-			}
-			for _, node := range group.children {
-				if err := ctx.Err(); err != nil {
-					return err
-				}
-				location := indexes[name][editorResourceID(node.attr("ID"))]
-				if !node.matchesOFD("ColorSpace") || location == "" {
-					continue
-				}
-				patch, err := editorXMLAttributePatch(data, node, "Profile", "/"+location)
-				if err != nil {
-					return err
-				}
-				patches = append(patches, patch)
-			}
-		}
-		updates[name] = editorPatchXML(data, patches)
-	}
-	if err := ctx.Err(); err != nil {
-		return err
-	}
-	maps.Copy(parts, updates)
-	for name := range aliases {
-		removed[name] = true
-		delete(parts, name)
-	}
-	return nil
-}

ofdgo_compression_raster.go

@@ -1,197 +0,0 @@
-// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ofdgo
-
-import (
-	"bytes"
-	"context"
-	"encoding/binary"
-	"errors"
-	"image"
-	"io"
-
-	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
-	"github.com/xiaoqidun/pdfgo"
-)
-
-// outputImageFormat 识别可由资源压缩生成的图片格式
-// 入参: data 图片编码
-// 返回: string 标准资源格式，未识别时为空
-func outputImageFormat(data []byte) string {
-	if baseimage.IsJPEG(data) {
-		return "JPEG"
-	}
-	if baseimage.IsPNG(data) {
-		return "PNG"
-	}
-	return ""
-}
-
-// optimizeImageResource 优化可完整保留的BMP及TIFF，复用图像压缩和降采样策略
-// 原始模式及无法保留的色彩配置不转换，仅采用小于原始编码的结果
-// 入参: ctx 取消上下文, data 图片编码, options 压缩选项, size 像素需求
-// 返回: []byte 图片编码，可能引用输入, error 解码、编码或取消错误
-func optimizeImageResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
-	if err := options.Validate(); err != nil {
-		return nil, err
-	}
-	if err := ctx.Err(); err != nil {
-		return nil, err
-	}
-	if options.Mode != CompressionUnchanged && baseimage.IsTIFF(data) {
-		return optimizeTIFFResource(ctx, data, options, size)
-	}
-	if options.Mode == CompressionUnchanged || !bytes.HasPrefix(data, []byte("BM")) {
-		return pdfgo.OptimizeImageResource(ctx, data, options, size)
-	}
-	return optimizeBMPResource(ctx, data, options, size)
-}
-
-// optimizeBMPResource 压缩可保留色彩与密度的位图，未知元数据及高精度位域保持原样
-// 入参: ctx 取消上下文, data BMP编码, options 压缩选项, size 像素需求
-// 返回: []byte 图片编码, error 解码、编码或取消错误
-func optimizeBMPResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
-	offset, width, height, depth, compression, err := baseimage.ParseBMPHeader(data)
-	if err != nil {
-		return data, nil
-	}
-	if height < 0 {
-		height = -height
-	}
-	if int64(width)*int64(height) > outputOptimizationBufferLimit/4 || compression != 0 && compression != 3 {
-		return data, nil
-	}
-	header := binary.LittleEndian.Uint32(data[14:18])
-	if header != 40 && header != 108 && header != 124 {
-		return data, nil
-	}
-	if header >= 108 && binary.LittleEndian.Uint32(data[70:74]) != 0x73524742 {
-		return data, nil
-	}
-	if header == 124 && (binary.LittleEndian.Uint32(data[122:126]) != 0 || binary.LittleEndian.Uint32(data[126:130]) != 0 || binary.LittleEndian.Uint32(data[130:134]) != 0) {
-		return data, nil
-	}
-	stride := (int64(width)*int64(depth) + 31) / 32 * 4
-	if int64(offset)+stride*int64(height) != int64(len(data)) {
-		return data, nil
-	}
-	density, ok := baseimage.BMPDensity(data)
-	if !ok {
-		return data, nil
-	}
-	if depth == 16 || depth == 32 {
-		masks, err := baseimage.BMPColorMasks(data, offset, depth, compression)
-		if err != nil {
-			return data, nil
-		}
-		if options.Mode == CompressionLossless {
-			for _, mask := range masks {
-				if mask.Max > 255 {
-					return data, nil
-				}
-			}
-		}
-	}
-	var pixels image.Image
-	if depth == 16 || compression == 3 {
-		pixels, err = baseimage.DecodeBMPContext(ctx, data)
-	} else {
-		pixels, _, err = image.Decode(imageInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
-	}
-	if err != nil {
-		return nil, err
-	}
-	return optimizeRasterResource(ctx, data, pixels, options, size, density)
-}
-
-// optimizeRasterResource 编码已解码的资源图片，同步降采样后的像素密度，仅采用更小结果
-// 先降采样再编码，绝对密度按最终尺寸量化，相对密度保留精确比例
-// 有密度时保留PNG，未知密度按最终像素选择编码格式
-// 入参: ctx 取消上下文, data 原编码, pixels 像素, options 压缩选项, size 像素需求, density 像素密度
-// 返回: []byte 图片编码, error 编码或取消错误
-func optimizeRasterResource(ctx context.Context, data []byte, pixels image.Image, options CompressionOptions, size image.Point, density baseimage.Density) ([]byte, error) {
-	hasDensity := density.X != 0 || density.Y != 0
-	before := pixels.Bounds().Size()
-	if options.Mode == CompressionLossy {
-		var err error
-		pixels, err = pdfgo.ResizeImage(ctx, pixels, size)
-		if err != nil {
-			return nil, err
-		}
-	}
-	var ok bool
-	density, ok = density.Scale(before, pixels.Bounds().Size())
-	if !ok {
-		return data, ctx.Err()
-	}
-	var candidate []byte
-	var err error
-	if hasDensity {
-		var encoded bytes.Buffer
-		err = pdfgo.EncodePNGWithOptions(ctx, &encoded, pixels, options)
-		candidate = encoded.Bytes()
-	} else {
-		candidate, err = pdfgo.EncodeImageResource(ctx, pixels, options)
-	}
-	if err != nil {
-		if errors.Is(err, io.ErrShortBuffer) {
-			return data, ctx.Err()
-		}
-		return nil, err
-	}
-	if hasDensity {
-		if len(candidate) > outputOptimizationBufferLimit-baseimage.PNGDensityChunkSize {
-			return data, ctx.Err()
-		}
-		candidate, ok = baseimage.WithPNGDensity(candidate, density)
-		if !ok {
-			return data, ctx.Err()
-		}
-	}
-	if err := ctx.Err(); err != nil {
-		return nil, err
-	}
-	if len(candidate) < len(data) {
-		return candidate, nil
-	}
-	return data, nil
-}
-
-// optimizeTIFFResource 压缩单目录TIFF，保留方向、透明度、采样精度及像素密度
-// 主图或单个瓦片的预计缓冲超限时保留原编码
-// 入参: ctx 取消上下文, data TIFF编码, options 压缩选项, size 显示像素需求
-// 返回: []byte 图片编码，不可完整转换时保留原文, error 编码或取消错误
-func optimizeTIFFResource(ctx context.Context, data []byte, options CompressionOptions, size image.Point) ([]byte, error) {
-	layout, err := baseimage.ReadTIFFLayoutContext(ctx, bytes.NewReader(data))
-	if err != nil {
-		return data, ctx.Err()
-	}
-	pixelSize := int64(layout.DecodedPixelBytes())
-	if int64(layout.Width) > outputOptimizationBufferLimit/pixelSize/int64(layout.Height) {
-		return data, ctx.Err()
-	}
-	if layout.TileWidth != 0 && int64(layout.TileWidth) > outputOptimizationBufferLimit/pixelSize/int64(layout.TileHeight) {
-		return data, ctx.Err()
-	}
-	density, ok := baseimage.TIFFConversionDensity(data, layout)
-	if !ok {
-		return data, ctx.Err()
-	}
-	pixels, err := baseimage.DecodeTIFF(ctx, data, layout)
-	if err != nil {
-		return data, ctx.Err()
-	}
-	return optimizeRasterResource(ctx, data, pixels, options, size, density)
-}

ofdgo_compression_resources.go

@@ -35,6 +35,12 @@ type outputImageKey struct {
 	size    image.Point
 }
 
+// editorProfileReference 记录颜色配置文件所在的资源索引及颜色空间标识
+type editorProfileReference struct {
+	index string
+	id    string
+}
+
 // compressResourceParts 优化输出图片并合并相同资源文件，保留资源标识及各自属性
 // 入参: parts 输出改动, reader 原包，可为空, removed 已移除条目
 // 返回: error 读取或取消错误
@@ -294,7 +300,7 @@ func (e *Editor) compressResourceReferences(parts map[string][]byte, reader *Rea
 				candidate, cached := imageResults[cacheKey]
 				var err error
 				if !cached {
-					candidate, err = optimizeImageResource(e.output.ctx, data, options, demand)
+					candidate, err = optimizeOutputImage(e.output.ctx, outputImageJob{data: data, key: outputImageKey{options: options, size: demand}})
 					if err := e.output.ctx.Err(); err != nil {
 						return err
 					}
@@ -460,7 +466,7 @@ func outputResourceDigest(ctx context.Context, reader *Reader, parts map[string]
 		}
 	}
 	hash := sha256.New()
-	_, err := io.CopyBuffer(hash, imageInput{ReadCloser: input, context: ctx}, buffer)
+	_, err := io.CopyBuffer(hash, imageInput{ReadCloser: input, ctx: ctx}, buffer)
 	closeErr := input.Close()
 	if err != nil {
 		return [32]byte{}, err
@@ -470,3 +476,200 @@ func outputResourceDigest(ctx context.Context, reader *Reader, parts map[string]
 	}
 	return [32]byte(hash.Sum(nil)), ctx.Err()
 }
+
+// compressionFontUsage 按文档合并共享字体用字，版本编辑仅统计选中入口
+// 入参: ctx 取消上下文, documents 文档入口, resources 资源索引, references 各文件引用, read 输出文件读取方法
+// 返回: map[string]*editorFontUsage 各字体文件的用字，无法确定作用域时为空, error 读取或取消错误
+func (r *Reader) compressionFontUsage(ctx context.Context, documents map[string]bool, resources []string, references map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
+	selected := ""
+	if r.OFD.DocBody[r.documentIndex].versioned {
+		var err error
+		selected, err = r.DocumentRootContext(ctx)
+		if err != nil {
+			return nil, err
+		}
+	}
+	scoped, err := resourceReferenceScopes(ctx, documents, resources, references, selected)
+	if err != nil || scoped == nil {
+		return nil, err
+	}
+	return resourceFontUsage(ctx, resources, scoped, read)
+}
+
+// resourceFontUsage 按已确认的文档作用域合并各字体文件的字符和字形引用
+// 入参: ctx 取消上下文, resources 资源索引, scoped 各索引的用字范围, read 输出文件读取方法
+// 返回: map[string]*editorFontUsage 各字体文件的用字, error 读取或取消错误
+func resourceFontUsage(ctx context.Context, resources []string, scoped map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
+	result := make(map[string]*editorFontUsage)
+	protected := make(map[string]bool)
+	for _, name := range resources {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		refs := scoped[name]
+		if refs == nil {
+			continue
+		}
+		data, err := read(name)
+		if err != nil {
+			return nil, err
+		}
+		root, err := parseEditorXMLContext(ctx, data)
+		if err != nil {
+			return nil, err
+		}
+		for font := range editorResourceNodes(root, "Fonts", "Font") {
+			if err := ctx.Err(); err != nil {
+				return nil, err
+			}
+			file := font.child("FontFile")
+			if file == nil {
+				continue
+			}
+			var value string
+			if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
+				return nil, err
+			}
+			location := editorResourceLocation(name, root.attr("BaseLoc"), value)
+			alternate := cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))
+			id, charset := editorResourceID(font.attr("ID")), font.attr("Charset")
+			unsafe := id == "" || charset != "" && !strings.EqualFold(charset, "unicode") || location != alternate
+			for i, path := range [2]string{location, alternate} {
+				if i == 1 && path == location {
+					continue
+				}
+				if result[path] == nil {
+					result[path] = newEditorFontUsage()
+				}
+				result[path].merge(refs.fonts[id], unsafe)
+			}
+		}
+		for media := range editorResourceNodes(root, "MultiMedias", "MultiMedia") {
+			file := media.child("MediaFile")
+			if file == nil {
+				continue
+			}
+			var value string
+			if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
+				return nil, err
+			}
+			for _, location := range []string{editorResourceLocation(name, root.attr("BaseLoc"), value), cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))} {
+				protected[location] = true
+			}
+		}
+	}
+	for location := range protected {
+		if usage := result[location]; usage != nil {
+			usage.unsafe = true
+		}
+	}
+	return result, ctx.Err()
+}
+
+// compactResourceProfiles 合并相同颜色配置文件，保留颜色空间声明和独立文件引用
+// 入参: ctx 取消上下文, reader 原包，可为空, parts 输出改动, profiles 配置文件引用, protected 不可替换的文件, removed 待移除文件
+// 返回: error 读取、改写或取消错误
+func compactResourceProfiles(ctx context.Context, reader *Reader, parts map[string][]byte, profiles map[string][]editorProfileReference, protected, removed map[string]bool) error {
+	if len(profiles) < 2 {
+		return ctx.Err()
+	}
+	seen := make(map[[32]byte]string)
+	aliases := make(map[string]string)
+	indexes := make(map[string]map[string]string)
+	ordered := slices.Sorted(maps.Keys(profiles))
+	sizes := make(map[string]uint64, len(profiles))
+	counts := make(map[uint64]int)
+	for _, name := range ordered {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		if protected[name] {
+			continue
+		}
+		size, err := outputResourceSize(reader, parts, name)
+		if err != nil {
+			return err
+		}
+		sizes[name] = size
+		counts[size]++
+	}
+	var buffer []byte
+	for _, name := range ordered {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		if protected[name] || counts[sizes[name]] < 2 {
+			continue
+		}
+		if buffer == nil {
+			buffer = make([]byte, 32*1024)
+		}
+		key, err := outputResourceDigest(ctx, reader, parts, name, buffer)
+		if err != nil {
+			return err
+		}
+		first, found := seen[key]
+		if !found {
+			seen[key] = name
+			continue
+		}
+		aliases[name] = first
+		for _, reference := range profiles[name] {
+			if indexes[reference.index] == nil {
+				indexes[reference.index] = make(map[string]string)
+			}
+			indexes[reference.index][reference.id] = first
+		}
+	}
+	updates := make(map[string][]byte, len(indexes))
+	for _, name := range slices.Sorted(maps.Keys(indexes)) {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		data, ok := parts[name]
+		if !ok {
+			if reader == nil {
+				return fmt.Errorf("file not found: %s", name)
+			}
+			var err error
+			data, err = reader.readFileViewContext(ctx, name)
+			if err != nil {
+				return err
+			}
+		}
+		root, err := parseEditorXMLContext(ctx, data)
+		if err != nil {
+			return err
+		}
+		var patches []editorXMLPatch
+		for _, group := range root.children {
+			if !group.matchesOFD("ColorSpaces") {
+				continue
+			}
+			for _, node := range group.children {
+				if err := ctx.Err(); err != nil {
+					return err
+				}
+				location := indexes[name][editorResourceID(node.attr("ID"))]
+				if !node.matchesOFD("ColorSpace") || location == "" {
+					continue
+				}
+				patch, err := editorXMLAttributePatch(data, node, "Profile", "/"+location)
+				if err != nil {
+					return err
+				}
+				patches = append(patches, patch)
+			}
+		}
+		updates[name] = editorPatchXML(data, patches)
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	maps.Copy(parts, updates)
+	for name := range aliases {
+		removed[name] = true
+		delete(parts, name)
+	}
+	return nil
+}

ofdgo_convert.go

@@ -15,11 +15,17 @@
 package ofdgo
 
 import (
+	"archive/zip"
+	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
+	"runtime"
 	"slices"
 	"strings"
+	"sync"
+	"time"
 
 	"github.com/xiaoqidun/pdfgo"
 )
@@ -45,6 +51,8 @@ type ConvertProgress struct {
 // Input为空时识别源格式，Format为输出格式，Pages使用零基索引，nil表示全部页面
 // PageRange使用一基页码表达式，与Pages互斥，空字符串表示全部页面
 // SkipUnchanged仅在未压缩、源格式与目标相同且未选页时不写出数据
+// Pool可由多个独立转换共享，nil时不限制文件间并发
+// Resources提供共享计算与缓存策略，显式Pool优先控制计算调度
 // 整份PDF同格式压缩直接重写PDF对象，其余PDF先转换为OFD对象再输出
 // RendererOptions同时用于PDF局部合成和输出，在PDF.RendererOptions之后应用
 // Backends统一配置转换与输出，优先于PDF和RendererOptions中的后端设置
@@ -53,11 +61,13 @@ type ConvertProgress struct {
 // PageOutput仅用于逐页格式，同步调用export写出一页并自行处理提交或回滚；此时output可为nil
 // 未提供PageOutput时，逐页格式打包ZIP；所有回调返回错误均会停止转换
 type ConvertOptions struct {
+	Resources       *Resources
 	Input           string
 	Format          string
 	Pages           []int
 	PageRange       string
 	SkipUnchanged   bool
+	Pool            *ConversionPool
 	Compression     CompressionOptions
 	Fonts           FontMode
 	Backends        *RenderBackends
@@ -80,19 +90,42 @@ type ConvertReport struct {
 	Fonts     []FontChange    `json:"fonts,omitempty"`
 }
 
+// ConversionPoolOptions 设置共享转换并行度及图像工作集预算
+// Parallelism为0时使用GOMAXPROCS，MemoryLimit为0时不指定固定预算
+// AvailableMemory返回可用于新增任务的字节数，nil表示不探测，回调须支持并发调用
+// 内存预算用于调度，不限制解析器及运行时的实际分配
+type ConversionPoolOptions struct {
+	Parallelism     int
+	MemoryLimit     int64
+	AvailableMemory func() int64
+}
+
+// ConversionPool 协调独立转换和图像任务，配置在创建后不变，可跨会话复用
+type ConversionPool struct {
+	options ConversionPoolOptions
+	mu      sync.Mutex
+	changed chan struct{}
+	active  int
+	images  int
+	memory  int64
+}
+
 // convertReader 将取消上下文传递到随机读取
 type convertReader struct {
-	context context.Context
+	ctx   context.Context
-	source  io.ReaderAt
+	input io.ReaderAt
 }
 
 // convertWriter 将取消上下文传递到写入并统计实际字节数
 type convertWriter struct {
-	context context.Context
+	ctx    context.Context
 	writer io.Writer
 	count  *int64
 }
 
+// conversionPoolKey 标识单次转换使用的共享预算
+type conversionPoolKey struct{}
+
 // OutputFormats 返回独立的输出格式列表，不依赖WebUI或具体渲染后端
 // 返回: []OutputFormat 输出格式列表
 func OutputFormats() []OutputFormat {
@@ -111,9 +144,23 @@ func OutputFormats() []OutputFormat {
 // 原始模式完整OFD另存保持源字节；选页和跨格式输出重新生成文档，压缩仅作用于输出副本
 // 输入按需随机读取，输出分块写出；解析对象及后端可能缓存资源，不保证恒定内存
 // 出错时报告保留已有诊断，调用方应丢弃未完成输出；只有返回nil才表示转换成功
-// 入参: ctx 取消上下文, source 源数据, size 源字节数, output 输出流, options 转换选项
+// 入参: ctx 取消上下文, input 输入源, output 输出流, options 转换选项
 // 返回: ConvertReport 转换报告, error 错误信息
-func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writer, options ConvertOptions) (report ConvertReport, err error) {
+func Convert(ctx context.Context, input *Input, output io.Writer, options ConvertOptions) (report ConvertReport, err error) {
+	if options.Resources != nil {
+		if options.Pool == nil {
+			options.Pool = options.Resources.pool
+		}
+		options.ReaderOptions = append(slices.Clone(options.ReaderOptions), WithResources(options.Resources))
+		options.PDF.Resources = options.Resources
+	}
+	if options.Pool != nil {
+		if err = options.Pool.acquire(ctx, false, 0); err != nil {
+			return report, err
+		}
+		defer options.Pool.release(false, 0)
+		ctx = context.WithValue(ctx, conversionPoolKey{}, options.Pool)
+	}
 	if err = options.Compression.Validate(); err != nil {
 		return report, err
 	}
@@ -165,13 +212,14 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 	if err = progress("open", 0, 0); err != nil {
 		return report, err
 	}
-	if source == nil || size <= 0 {
+	if input == nil || input.Size() <= 0 {
-		return report, fmt.Errorf("empty document source")
+		return report, fmt.Errorf("empty document input")
 	}
-	source = convertReader{context: ctx, source: source}
+	size := input.Size()
+	operationInput := &Input{reader: convertReader{ctx: ctx, input: input}, size: size}
 	report.Input = strings.ToLower(strings.TrimSpace(options.Input))
 	if report.Input == "" {
-		report.Input, err = DetectFormat(source, size)
+		report.Input, err = DetectFormat(operationInput)
 		if err != nil {
 			return report, err
 		}
@@ -190,7 +238,7 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 		return report, fmt.Errorf("missing output writer")
 	}
 	if report.Input == "pdf" && format == "pdf" && options.Compression.Mode != CompressionUnchanged && options.Pages == nil && strings.TrimSpace(options.PageRange) == "" {
-		pdfReader, openErr := pdfgo.NewReaderWithOptions(source, size, pdfgo.ReaderOptions{Password: options.PDF.Password, PasswordUTF8: options.PDF.PasswordUTF8})
+		pdfReader, openErr := pdfgo.NewReaderWithOptions(operationInput, size, pdfgo.ReaderOptions{Password: options.PDF.Password, PasswordUTF8: options.PDF.PasswordUTF8})
 		if openErr != nil {
 			return report, openErr
 		}
@@ -224,13 +272,13 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 			}
 			return nil
 		}
-		editor, report.PDF, err = ImportPDF(ctx, source, size, pdfOptions)
+		editor, report.PDF, err = ImportPDF(ctx, operationInput, pdfOptions)
 		if err != nil {
 			return report, err
 		}
 		count = editor.PageCount()
 	case "ofd":
-		reader, err = NewReader(source, size, options.ReaderOptions...)
+		reader, err = NewReader(operationInput, options.ReaderOptions...)
 		if err != nil {
 			return report, err
 		}
@@ -251,13 +299,13 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 		return report, err
 	}
 	report.Pages = len(indices)
-	writer := convertWriter{context: ctx, writer: output, count: &report.Bytes}
+	writer := convertWriter{ctx: ctx, writer: output, count: &report.Bytes}
 	if format == "ofd" {
 		if options.Pages == nil && editor == nil && options.Fonts == FontKeep && options.Compression.Mode == CompressionUnchanged {
 			if err = progress("write", 0, 0); err != nil {
 				return report, err
 			}
-			_, err = io.Copy(writer, io.NewSectionReader(source, 0, size))
+			_, err = io.Copy(writer, io.NewSectionReader(operationInput, 0, size))
 			report.Unchanged = err == nil
 			return report, err
 		}
@@ -292,7 +340,7 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 				if err = progress("write", 0, 0); err != nil {
 					return report, err
 				}
-				_, err = io.Copy(writer, io.NewSectionReader(source, 0, size))
+				_, err = io.Copy(writer, io.NewSectionReader(operationInput, 0, size))
 				report.Unchanged = err == nil
 				return report, err
 			}
@@ -300,7 +348,7 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 		if options.Pages == nil {
 			_, err = editor.WriteToWithOptions(ctx, writer, WriteOptions{Compression: options.Compression})
 		} else {
-			_, err = editor.WritePagesToWithOptions(ctx, writer, indices, WriteOptions{Compression: options.Compression})
+			_, err = editor.WritePagesTo(ctx, writer, indices, WriteOptions{Compression: options.Compression})
 		}
 		return report, err
 	}
@@ -343,7 +391,7 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 				return report, readErr
 			}
 			if err = options.PageOutput(index, func(output io.Writer) error {
-				return renderer.RenderTo(page, convertWriter{context: ctx, writer: output, count: &report.Bytes}, format)
+				return renderer.RenderTo(page, convertWriter{ctx: ctx, writer: output, count: &report.Bytes}, format)
 			}); err != nil {
 				return report, fmt.Errorf("export page %d: %w", index+1, err)
 			}
@@ -353,21 +401,25 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 	return report, err
 }
 
-// ReadAt 读取指定位置的数据并响应取消
+// ReadAt 读取前后响应取消，保留读取字节数和源错误
 // 入参: data 目标缓冲, offset 源偏移
 // 返回: int 读取字节数, error 读取错误
 func (r convertReader) ReadAt(data []byte, offset int64) (int, error) {
-	if err := r.context.Err(); err != nil {
+	if err := r.ctx.Err(); err != nil {
 		return 0, err
 	}
-	return r.source.ReadAt(data, offset)
+	n, err := r.input.ReadAt(data, offset)
+	if err == nil {
+		err = r.ctx.Err()
+	}
+	return n, err
 }
 
-// Write 写出数据并响应取消及短写
+// Write 写入前后响应取消，保留写入及短写错误
 // 入参: data 待写数据
 // 返回: int 写入字节数, error 写入错误
 func (w convertWriter) Write(data []byte) (int, error) {
-	if err := w.context.Err(); err != nil {
+	if err := w.ctx.Err(); err != nil {
 		return 0, err
 	}
 	n, err := w.writer.Write(data)
@@ -375,5 +427,181 @@ func (w convertWriter) Write(data []byte) (int, error) {
 	if err == nil && n != len(data) {
 		err = io.ErrShortWrite
 	}
+	if err == nil {
+		err = w.ctx.Err()
+	}
 	return n, err
 }
+
+// WriteString 写入字符串并保留底层原生写入能力，前后响应取消
+// 入参: data 待写文本
+// 返回: int 写入字节数, error 写入、短写或取消错误
+func (w convertWriter) WriteString(data string) (int, error) {
+	if err := w.ctx.Err(); err != nil {
+		return 0, err
+	}
+	n, err := io.WriteString(w.writer, data)
+	*w.count += int64(n)
+	if err == nil && n != len(data) {
+		err = io.ErrShortWrite
+	}
+	if err == nil {
+		err = w.ctx.Err()
+	}
+	return n, err
+}
+
+// DetectFormat 按文件内容识别PDF或OFD，不读取压缩内容或关闭输入
+// 识别结果不代表文档完整有效，仍需通过对应阅读器解析
+// 入参: input 输入源
+// 返回: string 格式标识pdf或ofd, error 读取错误或不支持的格式
+func DetectFormat(input *Input) (string, error) {
+	if input == nil || input.Size() <= 0 {
+		return "", fmt.Errorf("empty document input")
+	}
+	size := input.Size()
+	var header [1024]byte
+	data := header[:min(size, int64(len(header)))]
+	n, err := input.ReadAt(data, 0)
+	if err != nil && err != io.EOF {
+		return "", err
+	}
+	if n != len(data) {
+		return "", io.ErrUnexpectedEOF
+	}
+	if bytes.HasPrefix(data, []byte("%PDF-")) {
+		return "pdf", nil
+	}
+	archive, err := zip.NewReader(input, size)
+	if err == nil {
+		reader := &Reader{Zip: archive}
+		if err := reader.indexPackage(); err != nil {
+			return "", err
+		}
+		if reader.fileNames["OFD.xml"] || reader.fileNames["Encryptions.xml"] {
+			return "ofd", nil
+		}
+	} else {
+		if !errors.Is(err, zip.ErrFormat) {
+			return "", err
+		}
+		if bytes.Contains(data, []byte("%PDF-")) {
+			return "pdf", nil
+		}
+	}
+	return "", fmt.Errorf("unsupported input format")
+}
+
+// NewConversionPool 创建共享转换调度器，不启动后台任务
+// 入参: options 并行及内存选项
+// 返回: *ConversionPool 调度器, error 配置错误
+func NewConversionPool(options ConversionPoolOptions) (*ConversionPool, error) {
+	if options.Parallelism < 0 || options.MemoryLimit < 0 {
+		return nil, fmt.Errorf("invalid conversion pool options")
+	}
+	if options.Parallelism == 0 {
+		options.Parallelism = runtime.GOMAXPROCS(0)
+	}
+	return &ConversionPool{options: options, changed: make(chan struct{})}, nil
+}
+
+// Parallelism 返回同时运行的转换数量上限
+// 返回: int 并行上限
+func (p *ConversionPool) Parallelism() int { return p.options.Parallelism }
+
+// memoryLimit 读取当前可分配的图像工作量预算
+// 返回: int64 可用字节数，负值表示未设置预算
+func (p *ConversionPool) memoryLimit() int64 {
+	limit := int64(-1)
+	if p.options.MemoryLimit > 0 {
+		limit = p.options.MemoryLimit
+	}
+	if p.options.AvailableMemory != nil {
+		available := max(0, p.options.AvailableMemory())
+		if limit < 0 || available < limit {
+			limit = available
+		}
+	}
+	return limit
+}
+
+// acquire 等待转换或图像预算，超预算图像可独占运行
+// 入参: ctx 取消上下文, image 是否为图像任务, size 图像工作量
+// 返回: error 取消错误
+func (p *ConversionPool) acquire(ctx context.Context, image bool, size int64) error {
+	var timer *time.Timer
+	defer func() {
+		if timer != nil {
+			timer.Stop()
+		}
+	}()
+	for {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		limit := p.memoryLimit()
+		p.mu.Lock()
+		allowed := p.active < p.options.Parallelism && (p.active == 0 || limit != 0)
+		if image {
+			allowed = p.images < p.options.Parallelism && (p.images == 0 || limit < 0 || size <= limit-p.memory)
+		}
+		if allowed {
+			if image {
+				p.images++
+				p.memory += size
+			} else {
+				p.active++
+			}
+			p.mu.Unlock()
+			return nil
+		}
+		changed := p.changed
+		p.mu.Unlock()
+		var tick <-chan time.Time
+		if p.options.AvailableMemory != nil {
+			if timer == nil {
+				timer = time.NewTimer(250 * time.Millisecond)
+			} else {
+				timer.Reset(250 * time.Millisecond)
+			}
+			tick = timer.C
+		}
+		select {
+		case <-ctx.Done():
+		case <-changed:
+		case <-tick:
+		}
+		if timer != nil {
+			timer.Stop()
+		}
+	}
+}
+
+// release 归还任务预算并唤醒等待者
+// 入参: image 是否为图像任务, size 图像工作量
+func (p *ConversionPool) release(image bool, size int64) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	if image {
+		p.images--
+		p.memory -= size
+	} else {
+		p.active--
+	}
+	close(p.changed)
+	p.changed = make(chan struct{})
+}
+
+// conversionWorkers 按当前文件数量分配内部计算任务
+// 入参: ctx 转换上下文
+// 返回: int 内部并行数
+func conversionWorkers(ctx context.Context) int {
+	p, _ := ctx.Value(conversionPoolKey{}).(*ConversionPool)
+	if p == nil {
+		return runtime.GOMAXPROCS(0)
+	}
+	p.mu.Lock()
+	active := p.active
+	p.mu.Unlock()
+	return max(1, p.options.Parallelism/max(1, active))
+}

ofdgo_crypto.go

@@ -17,7 +17,18 @@ package ofdgo
 import (
 	"bytes"
 	"crypto"
+	"crypto/cipher"
+	"crypto/ecdsa"
+	"crypto/rand"
 	"errors"
+	"fmt"
+	"io"
+
+	"github.com/emmansun/gmsm/padding"
+	"github.com/emmansun/gmsm/sm2"
+	"github.com/emmansun/gmsm/sm3"
+	"github.com/emmansun/gmsm/sm4"
+	"github.com/emmansun/gmsm/smx509"
 )
 
 // 加密错误可通过errors.Is识别，不包含口令或私钥
@@ -48,15 +59,9 @@ type CryptoProvider interface {
 	EncryptKey(certificate, key []byte) ([]byte, error)
 }
 
-// ReaderOption 阅读器的凭据与密码提供者选项
+// ReaderOption 阅读器的凭据、密码提供者与资源选项
 type ReaderOption func(*readerOptions)
 
-// readerOptions 保存打开文档时的会话参数
-type readerOptions struct {
-	credentials []Credentials
-	provider    CryptoProvider
-}
-
 // EncryptionRecipient 证书加密接收者，Certificate为SM2公钥证书的DER编码
 type EncryptionRecipient struct {
 	UserName    string
@@ -85,12 +90,22 @@ type EncryptionInfo struct {
 	PolicyRequired bool
 }
 
+// readerOptions 保存打开文档时的会话参数
+type readerOptions struct {
+	resources   *Resources
+	credentials []Credentials
+	provider    CryptoProvider
+}
+
 // encryptionState 保存解密来源与可继承的输出策略
 type encryptionState struct {
 	info    EncryptionInfo
 	options *EncryptionOptions
 }
 
+// GMCryptoProvider 使用纯Go国密实现，可在原生环境和WASM使用
+type GMCryptoProvider struct{}
+
 // WithCredentials 添加解密凭据，多次调用可解开多层加密
 // 入参: credentials 解密凭据
 // 返回: ReaderOption 阅读选项
@@ -145,3 +160,157 @@ func cloneEncryptionOptions(options *EncryptionOptions) *EncryptionOptions {
 	}
 	return &copy
 }
+
+// Encryption 获取当前保存策略，不暴露口令或私钥
+// 返回: EncryptionInfo 加密状态
+func (e *Editor) Encryption() EncryptionInfo {
+	return e.encryption.summary()
+}
+
+// SetEncryption 设置后续保存的加密策略，nil显式选择明文保存
+// 打开单用户口令或证书加密文档时默认继承原策略；多人口令和多层加密需显式选择输出策略
+// 新的加密密钥与初始向量在每次保存时独立生成，设置不改变文档内容或撤销历史
+// 入参: options 加密策略
+// 返回: error 错误信息
+func (e *Editor) SetEncryption(options *EncryptionOptions) error {
+	if options == nil {
+		e.encryption = nil
+		return nil
+	}
+	if err := validateEncryptionOptions(*options); err != nil {
+		return err
+	}
+	info := EncryptionInfo{Encrypted: true, Method: "1.1.1", Layers: 1}
+	if len(options.Password) != 0 {
+		info.Users = []string{options.UserName}
+	} else {
+		info.Method = "1.1.2"
+		for _, recipient := range options.Recipients {
+			info.Users = append(info.Users, recipient.UserName)
+		}
+	}
+	e.encryption = &encryptionState{info: info, options: cloneEncryptionOptions(options)}
+	return nil
+}
+
+// writeEncrypted 在全部准备及加密成功后写出结果，取消不产生输出
+// 输出流自身写入失败时调用方仍需丢弃本次输出
+// 入参: writer 输出流
+// 返回: int64 写入字节数, error 错误信息
+func (e *Editor) writeEncrypted(writer io.Writer) (int64, error) {
+	if e.encryption.options == nil {
+		return 0, ErrEncryptionPolicyRequired
+	}
+	var plaintext bytes.Buffer
+	if _, err := e.writePlaintext(&plaintext); err != nil {
+		return 0, err
+	}
+	defer clear(plaintext.Bytes())
+	r, err := NewReader(&Input{reader: bytes.NewReader(plaintext.Bytes()), size: int64(plaintext.Len())})
+	if err != nil {
+		return 0, err
+	}
+	defer r.Close()
+	parts, err := r.packageData()
+	if err != nil {
+		return 0, err
+	}
+	defer func() {
+		for _, data := range parts {
+			clear(data)
+		}
+	}()
+	data, err := encryptPackageParts(parts, *e.encryption.options, editorProgress(e.OnWriteProgress))
+	if err != nil {
+		return 0, err
+	}
+	return io.Copy(writer, bytes.NewReader(data))
+}
+
+// EncryptSM4 使用SM4-CBC及PKCS#7填充加密
+// 入参: key 密钥, iv 初始向量, plaintext 明文
+// 返回: []byte 密文, error 错误信息
+func (GMCryptoProvider) EncryptSM4(key, iv, plaintext []byte) ([]byte, error) {
+	block, err := sm4.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	if len(iv) != block.BlockSize() {
+		return nil, fmt.Errorf("invalid SM4 IV length")
+	}
+	out := padding.NewPKCS7Padding(sm4.BlockSize).Pad(bytes.Clone(plaintext))
+	cipher.NewCBCEncrypter(block, iv).CryptBlocks(out, out)
+	return out, nil
+}
+
+// DecryptSM4 解密SM4-CBC并校验PKCS#7填充
+// 入参: key 密钥, iv 初始向量, ciphertext 密文
+// 返回: []byte 明文, error 错误信息
+func (GMCryptoProvider) DecryptSM4(key, iv, ciphertext []byte) ([]byte, error) {
+	block, err := sm4.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	if len(iv) != block.BlockSize() || len(ciphertext) == 0 || len(ciphertext)%block.BlockSize() != 0 {
+		return nil, ErrInvalidCredentials
+	}
+	out := make([]byte, len(ciphertext))
+	cipher.NewCBCDecrypter(block, iv).CryptBlocks(out, ciphertext)
+	plain, err := padding.NewPKCS7Padding(sm4.BlockSize).ConstantTimeUnpad(out)
+	if err != nil {
+		clear(out)
+		return nil, ErrInvalidCredentials
+	}
+	return plain, nil
+}
+
+// PasswordKey 按GB/T32918派生16字节口令密钥
+// 入参: password UTF-8口令
+// 返回: []byte 密钥, error 错误信息
+func (GMCryptoProvider) PasswordKey(password []byte) ([]byte, error) {
+	if len(password) == 0 {
+		return nil, ErrCredentialsRequired
+	}
+	return sm3.Kdf(password, sm4.BlockSize), nil
+}
+
+// EncryptKey 使用SM2公钥证书封装文件密钥
+// 入参: certificate DER证书, key 文件密钥
+// 返回: []byte ASN.1密文, error 错误信息
+func (GMCryptoProvider) EncryptKey(certificate, key []byte) ([]byte, error) {
+	cert, err := parseEncryptionCertificate(certificate)
+	if err != nil {
+		return nil, err
+	}
+	return sm2.EncryptASN1(rand.Reader, cert.PublicKey.(*ecdsa.PublicKey), key)
+}
+
+// ParseEncryptionCertificate 解析单张SM2加密证书并返回DER副本
+// 仅检查格式、算法和密钥用途，接收者身份及信任应由调用方确认
+// 入参: certificate PEM或DER证书
+// 返回: []byte DER证书, error 错误信息
+func ParseEncryptionCertificate(certificate []byte) ([]byte, error) {
+	cert, err := parseEncryptionCertificate(certificate)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.Clone(cert.Raw), nil
+}
+
+// parseEncryptionCertificate 解析并检查加密证书
+// 入参: certificate PEM或DER证书
+// 返回: *smx509.Certificate 证书, error 错误信息
+func parseEncryptionCertificate(certificate []byte) (*smx509.Certificate, error) {
+	cert, err := parseSignatureCertificate(certificate)
+	if err != nil {
+		return nil, err
+	}
+	public, ok := cert.PublicKey.(*ecdsa.PublicKey)
+	if !ok || !sm2.IsSM2PublicKey(public) {
+		return nil, fmt.Errorf("SM2 encryption certificate required")
+	}
+	if cert.KeyUsage != 0 && cert.KeyUsage&(smx509.KeyUsageKeyEncipherment|smx509.KeyUsageDataEncipherment|smx509.KeyUsageKeyAgreement) == 0 {
+		return nil, fmt.Errorf("certificate does not permit encryption")
+	}
+	return cert, nil
+}

ofdgo_crypto_editor.go

@@ -1,86 +0,0 @@
-// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ofdgo
-
-import (
-	"bytes"
-	"io"
-)
-
-// Encryption 获取当前保存策略，不暴露口令或私钥
-// 返回: EncryptionInfo 加密状态
-func (e *Editor) Encryption() EncryptionInfo {
-	return e.encryption.summary()
-}
-
-// SetEncryption 设置后续保存的加密策略，nil显式选择明文保存
-// 打开单用户口令或证书加密文档时默认继承原策略；多人口令和多层加密需显式选择输出策略
-// 新的加密密钥与初始向量在每次保存时独立生成，设置不改变文档内容或撤销历史
-// 入参: options 加密策略
-// 返回: error 错误信息
-func (e *Editor) SetEncryption(options *EncryptionOptions) error {
-	if options == nil {
-		e.encryption = nil
-		return nil
-	}
-	if err := validateEncryptionOptions(*options); err != nil {
-		return err
-	}
-	info := EncryptionInfo{Encrypted: true, Method: "1.1.1", Layers: 1}
-	if len(options.Password) != 0 {
-		info.Users = []string{options.UserName}
-	} else {
-		info.Method = "1.1.2"
-		for _, recipient := range options.Recipients {
-			info.Users = append(info.Users, recipient.UserName)
-		}
-	}
-	e.encryption = &encryptionState{info: info, options: cloneEncryptionOptions(options)}
-	return nil
-}
-
-// writeEncrypted 在全部准备及加密成功后写出结果，取消不产生输出
-// 输出流自身写入失败时调用方仍需丢弃本次输出
-// 入参: writer 输出流
-// 返回: int64 写入字节数, error 错误信息
-func (e *Editor) writeEncrypted(writer io.Writer) (int64, error) {
-	if e.encryption.options == nil {
-		return 0, ErrEncryptionPolicyRequired
-	}
-	var plaintext bytes.Buffer
-	if _, err := e.writePlaintext(&plaintext); err != nil {
-		return 0, err
-	}
-	defer clear(plaintext.Bytes())
-	r, err := NewReader(bytes.NewReader(plaintext.Bytes()), int64(plaintext.Len()))
-	if err != nil {
-		return 0, err
-	}
-	defer r.Close()
-	parts, err := r.packageData()
-	if err != nil {
-		return 0, err
-	}
-	defer func() {
-		for _, data := range parts {
-			clear(data)
-		}
-	}()
-	data, err := encryptPackageParts(parts, *e.encryption.options, editorProgress(e.OnWriteProgress))
-	if err != nil {
-		return 0, err
-	}
-	return io.Copy(writer, bytes.NewReader(data))
-}

ofdgo_crypto_gm.go

@@ -1,120 +0,0 @@
-// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ofdgo
-
-import (
-	"bytes"
-	"crypto/cipher"
-	"crypto/ecdsa"
-	"crypto/rand"
-	"fmt"
-
-	"github.com/emmansun/gmsm/padding"
-	"github.com/emmansun/gmsm/sm2"
-	"github.com/emmansun/gmsm/sm3"
-	"github.com/emmansun/gmsm/sm4"
-	"github.com/emmansun/gmsm/smx509"
-)
-
-// GMCryptoProvider 使用纯Go国密实现，可在原生环境和WASM使用
-type GMCryptoProvider struct{}
-
-// EncryptSM4 使用SM4-CBC及PKCS#7填充加密
-// 入参: key 密钥, iv 初始向量, plaintext 明文
-// 返回: []byte 密文, error 错误信息
-func (GMCryptoProvider) EncryptSM4(key, iv, plaintext []byte) ([]byte, error) {
-	block, err := sm4.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-	if len(iv) != block.BlockSize() {
-		return nil, fmt.Errorf("invalid SM4 IV length")
-	}
-	out := padding.NewPKCS7Padding(sm4.BlockSize).Pad(bytes.Clone(plaintext))
-	cipher.NewCBCEncrypter(block, iv).CryptBlocks(out, out)
-	return out, nil
-}
-
-// DecryptSM4 解密SM4-CBC并校验PKCS#7填充
-// 入参: key 密钥, iv 初始向量, ciphertext 密文
-// 返回: []byte 明文, error 错误信息
-func (GMCryptoProvider) DecryptSM4(key, iv, ciphertext []byte) ([]byte, error) {
-	block, err := sm4.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-	if len(iv) != block.BlockSize() || len(ciphertext) == 0 || len(ciphertext)%block.BlockSize() != 0 {
-		return nil, ErrInvalidCredentials
-	}
-	out := make([]byte, len(ciphertext))
-	cipher.NewCBCDecrypter(block, iv).CryptBlocks(out, ciphertext)
-	plain, err := padding.NewPKCS7Padding(sm4.BlockSize).ConstantTimeUnpad(out)
-	if err != nil {
-		clear(out)
-		return nil, ErrInvalidCredentials
-	}
-	return plain, nil
-}
-
-// PasswordKey 按GB/T32918派生16字节口令密钥
-// 入参: password UTF-8口令
-// 返回: []byte 密钥, error 错误信息
-func (GMCryptoProvider) PasswordKey(password []byte) ([]byte, error) {
-	if len(password) == 0 {
-		return nil, ErrCredentialsRequired
-	}
-	return sm3.Kdf(password, sm4.BlockSize), nil
-}
-
-// EncryptKey 使用SM2公钥证书封装文件密钥
-// 入参: certificate DER证书, key 文件密钥
-// 返回: []byte ASN.1密文, error 错误信息
-func (GMCryptoProvider) EncryptKey(certificate, key []byte) ([]byte, error) {
-	cert, err := parseEncryptionCertificate(certificate)
-	if err != nil {
-		return nil, err
-	}
-	return sm2.EncryptASN1(rand.Reader, cert.PublicKey.(*ecdsa.PublicKey), key)
-}
-
-// ParseEncryptionCertificate 解析单张SM2加密证书并返回DER副本
-// 仅检查格式、算法和密钥用途，接收者身份及信任应由调用方确认
-// 入参: certificate PEM或DER证书
-// 返回: []byte DER证书, error 错误信息
-func ParseEncryptionCertificate(certificate []byte) ([]byte, error) {
-	cert, err := parseEncryptionCertificate(certificate)
-	if err != nil {
-		return nil, err
-	}
-	return bytes.Clone(cert.Raw), nil
-}
-
-// parseEncryptionCertificate 解析并检查加密证书
-// 入参: certificate PEM或DER证书
-// 返回: *smx509.Certificate 证书, error 错误信息
-func parseEncryptionCertificate(certificate []byte) (*smx509.Certificate, error) {
-	cert, err := parseSignatureCertificate(certificate)
-	if err != nil {
-		return nil, err
-	}
-	public, ok := cert.PublicKey.(*ecdsa.PublicKey)
-	if !ok || !sm2.IsSM2PublicKey(public) {
-		return nil, fmt.Errorf("SM2 encryption certificate required")
-	}
-	if cert.KeyUsage != 0 && cert.KeyUsage&(smx509.KeyUsageKeyEncipherment|smx509.KeyUsageDataEncipherment|smx509.KeyUsageKeyAgreement) == 0 {
-		return nil, fmt.Errorf("certificate does not permit encryption")
-	}
-	return cert, nil
-}

ofdgo_crypto_package.go

@@ -93,7 +93,7 @@ type encryptionEntry struct {
 // 入参: data 明文OFD包, options 加密策略
 // 返回: []byte 加密OFD包, error 错误信息
 func EncryptPackage(data []byte, options EncryptionOptions) ([]byte, error) {
-	r, err := NewReader(bytes.NewReader(data), int64(len(data)))
+	r, err := NewReader(&Input{reader: bytes.NewReader(data), size: int64(len(data))})
 	if err != nil {
 		return nil, err
 	}
@@ -113,6 +113,7 @@ func (r *Reader) open(options []ReaderOption) error {
 	for _, option := range options {
 		option(&settings)
 	}
+	r.resources = settings.resources
 	if settings.provider == nil {
 		settings.provider = GMCryptoProvider{}
 	}

ofdgo_editor.go

@@ -40,7 +40,7 @@ import (
 const editorPathValidationLimit = 1024
 
 // Editor 编辑OFD文档，长度单位为毫米，页面索引从0开始，实例需串行使用
-// Info可修改文档元数据，通过方法管理页面、对象和资源，WriteTo另存结果，不覆盖输入
+// Info可修改文档元数据，通过方法管理页面、对象和资源，WriteTo输出副本，Save和SaveAs通过输出事务保存
 // OnWriteProgress可选，按fonts、pages、references、resources、compress、write阶段同步回报进度，返回错误则停止保存
 // completed和total为当前阶段已处理及总工作项，compress累计完成条目数且total为0，write阶段不计数
 // 阶段可重复，准备完成不代表保存成功
@@ -50,6 +50,7 @@ type Editor struct {
 	Info               DocInfo
 	pages              []PageContent
 	resources          []editorResource
+	runtimeResources   *Resources
 	fonts              map[string]*FontResource
 	fontRegistration   editorFontRegistration
 	fontDirs           []string
@@ -73,7 +74,12 @@ type Editor struct {
 	outlines           []byte
 	encryption         *encryptionState
 	output             *outputOptimization
+	saveTarget         Output
+	snapshotArchive    *editorSnapshotArchive
 	validatedPaths     *renderCache[string, bool]
+	changes            EditorChanges
+	transactionChanges *EditorChanges
+	objectIndex        *editorObjectIndex
 	richIndex          *richTextIndex
 }
 
@@ -152,11 +158,13 @@ func (e *Editor) Backends() RenderBackends {
 // NewEditor 创建空白文档，保存前至少添加一页
 // 返回: *Editor 文档编辑器
 func NewEditor() *Editor {
+	resources, _ := NewResources(ResourceOptions{})
 	var id [16]byte
 	rand.Read(id[:])
 	id[6] = id[6]&0x0f | 0x40
 	id[8] = id[8]&0x3f | 0x80
 	return &Editor{
+		runtimeResources: resources,
 		Info: DocInfo{
 			DocID:        hex.EncodeToString(id[:]),
 			CreationDate: time.Now().Format("2006-01-02"),
@@ -170,6 +178,30 @@ func NewEditor() *Editor {
 	}
 }
 
+// SetResources 替换后续操作的资源策略，需与编辑操作串行调用
+// 已创建的阅读器和快照继续使用原策略，不修改文档或撤销记录
+// 入参: resources 共享策略，nil使用默认策略
+func (e *Editor) SetResources(resources *Resources) {
+	if resources == nil {
+		resources, _ = NewResources(ResourceOptions{})
+	}
+	if resources == e.runtimeResources {
+		return
+	}
+	e.runtimeResources = resources
+	e.snapshotArchive = nil
+	e.fontRenderer = nil
+	e.fontSourcesCache = newFontSourceCache(resources)
+	e.validatedPaths = nil
+	if e.source != nil {
+		source := *e.source
+		e.source = &source
+		e.source.reader = cloneEditorReader(e.source.reader)
+		e.source.reader.resources = resources
+		e.source.reader.pageContents = resourceCache[pageContentKey, PageContent](resources, 16<<20)
+	}
+}
+
 // PageCount 获取当前页数
 // 返回: int 页数
 func (e *Editor) PageCount() int {
@@ -194,7 +226,14 @@ func (e *Editor) SetInfo(info DocInfo) {
 // 入参: index 页面索引
 // 返回: *PageContent 页面内容, error 错误信息
 func (e *Editor) Page(index int) (*PageContent, error) {
-	page, err := e.page(index)
+	return e.PageContext(context.Background(), index)
+}
+
+// PageContext 获取独立页面副本，读取、解析及整理对象时响应取消
+// 入参: ctx 取消上下文, index 页面索引
+// 返回: *PageContent 页面内容, error 读取或取消错误
+func (e *Editor) PageContext(ctx context.Context, index int) (*PageContent, error) {
+	page, err := e.pageContext(ctx, index)
 	if err != nil {
 		return nil, err
 	}
@@ -204,9 +243,11 @@ func (e *Editor) Page(index int) (*PageContent, error) {
 		layer := &result.Content.Layer[i]
 		layer.TextObject, layer.PathObject, layer.ImageObject, layer.CompositeGraphicUnit = nil, nil, nil, nil
 		for _, object := range layer.Objects {
+			if err := ctx.Err(); err != nil {
+				return nil, err
+			}
 			switch object.Type {
 			case "TextObject":
-				object.TextObject.layout = nil
 				layer.TextObject = append(layer.TextObject, object.TextObject)
 			case "PathObject":
 				layer.PathObject = append(layer.PathObject, object.PathObject)
@@ -589,7 +630,9 @@ func (e *Editor) Object(page int, id string) (GraphicObject, error) {
 	}
 	object, err := cloneEditorObject(layer.Objects[index])
 	object.origin = e.objectOrigin(id)
-	e.attachRichTextSnapshot(page, &object)
+	if err := e.attachRichTextSnapshot(page, &object); err != nil {
+		return GraphicObject{}, err
+	}
 	return object, err
 }
 
@@ -757,13 +800,7 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 	if err != nil {
 		return err
 	}
-	if err := LayoutText(obj, value, options, metrics); err != nil {
+	return LayoutText(obj, value, options, metrics)
-		return err
-	}
-	if obj.layout == nil && e.objectOrigin(obj.ID) != nil {
-		obj.layout = &textLayout{value: obj.Text(), options: options}
-	}
-	return nil
 }
 
 // newRenderer 使用编辑器字体来源和完整后端配置创建资源度量器
@@ -771,7 +808,7 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 // 返回: *Renderer 度量器
 func (e *Editor) newRenderer(reader *Reader) *Renderer {
 	if e.fontSourcesCache == nil {
-		e.fontSourcesCache = newFontSourceCache()
+		e.fontSourcesCache = newFontSourceCache(e.runtimeResources)
 	}
 	renderer := NewRenderer(reader, WithFontDirs(e.fontDirs...), WithFontFS(e.fontFS...), WithRenderBackends(e.backends))
 	renderer.fontSourcesCache = e.fontSourcesCache.child()
@@ -791,11 +828,21 @@ func (r editorResource) definition() string {
 // 入参: index 页面索引
 // 返回: *PageContent 页面内容, error 错误信息
 func (e *Editor) page(index int) (*PageContent, error) {
+	return e.pageContext(context.Background(), index)
+}
+
+// pageContext 按索引加载内部页面并响应取消
+// 入参: ctx 取消上下文, index 页面索引
+// 返回: *PageContent 页面内容, error 读取或取消错误
+func (e *Editor) pageContext(ctx context.Context, index int) (*PageContent, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
 	if index < 0 || index >= len(e.pages) {
 		return nil, fmt.Errorf("page index %d out of range", index)
 	}
 	if e.source != nil {
-		if err := e.loadSourcePage(index); err != nil {
+		if err := e.loadSourcePageContext(ctx, index); err != nil {
 			return nil, err
 		}
 	}
@@ -843,13 +890,8 @@ func (e *Editor) findObject(page int, id string) (*Layer, int, error) {
 	if err != nil {
 		return nil, 0, err
 	}
-	for i := range content.Content.Layer {
+	if position, ok := e.objectPositions(content)[id]; ok {
-		layer := &content.Content.Layer[i]
+		return &content.Content.Layer[position.layer], position.index, nil
-		for index, object := range layer.Objects {
-			if editorObjectID(object) == id && id != "" {
-				return layer, index, nil
-			}
-		}
 	}
 	return nil, 0, fmt.Errorf("object %q not found on page %d", id, page)
 }
@@ -1323,7 +1365,7 @@ func (v *editorValidation) creationPath(value string) error {
 // 返回: *renderCache[string, bool] 校验缓存
 func (e *Editor) pathValidationCache() *renderCache[string, bool] {
 	if e.validatedPaths == nil {
-		e.validatedPaths = &renderCache[string, bool]{limit: 8 << 20}
+		e.validatedPaths = resourceCache[string, bool](e.runtimeResources, 8<<20)
 	}
 	return e.validatedPaths
 }