feat(编辑创建): 支持图片建页

assets/webui/index.html

@@ -164,7 +164,7 @@
 				<span>擦除</span>
 			</div>
 			<div class="editor-group">
-				<select id="addPageButton" aria-label="新增页面" title="新增页面"><option value="" hidden>新增</option><option value="blank">空白</option><option value="import">插页</option></select>
+				<select id="addPageButton" aria-label="新增页面" title="新增页面"><option value="" hidden>新增</option><option value="blank">空白</option><option value="import">插页</option><option value="images">图片</option></select>
 				<button id="copyPageButton" class="button" type="button" aria-label="复制页面">复制</button>
 				<button id="deletePageButton" class="button" type="button" aria-label="删除页面">删除</button>
 				<button id="movePagePrevButton" class="button" type="button" aria-label="页面前移">前移</button>
@@ -284,11 +284,14 @@
 		</dialog>
 		<dialog id="createPanel" class="form-dialog" aria-label="新建文档">
 			<form id="createForm">
+				<div id="createModeRow" class="form-row"><label for="createMode">来源</label><select id="createMode"><option value="blank">空白</option><option value="images">图片</option></select></div>
 				<div class="form-row">
 					<label for="createName">名称</label>
 					<input id="createName" type="text" value="未命名" required autofocus>
 				</div>
-				<div class="form-pair">
+				<div id="createImagesRow" class="form-row" hidden><label for="createImages">图片</label><input id="createImages" type="file" accept=".png,.jpg,.jpeg,.jb2,.jbig2" multiple disabled></div>
+				<div id="createSizeRow" class="form-row" hidden><label for="createSize">尺寸</label><select id="createSize" disabled><option value="image">随图</option><option value="custom">自定</option></select></div>
+				<div id="createDimensions" class="form-pair">
 					<div class="form-row">
 						<label for="createWidth">宽度</label>
 						<div class="form-unit"><input id="createWidth" type="number" value="210" min="1" step="any" required><span>mm</span></div>
@@ -298,10 +301,12 @@
 						<div class="form-unit"><input id="createHeight" type="number" value="297" min="1" step="any" required><span>mm</span></div>
 					</div>
 				</div>
+				<div id="createMarginRow" class="form-row" hidden><label for="createMargin">边距</label><div class="form-unit"><input id="createMargin" type="number" value="0" min="0" step="any" required disabled><span>mm</span></div></div>
+				<div id="createPositionRow" class="form-row" hidden><label for="createPosition">位置</label><select id="createPosition" disabled><option value="before">页前</option><option value="after" selected>页后</option><option value="first">开头</option><option value="last">末尾</option></select></div>
 				<div class="form-actions">
 					<div id="createStatus" class="form-status" role="status"></div>
 					<button id="createCancel" class="button" type="button">取消</button>
-					<button class="button" type="submit">新建</button>
+					<button id="createSubmit" class="button" type="submit">新建</button>
 				</div>
 			</form>
 		</dialog>

assets/webui/ofdgo.js

@@ -55,6 +55,8 @@ const state = {
 	importPageCount: 0,
 	importEncrypted: false,
 	importing: false,
+	imageImporting: false,
+	createInsert: false,
 	pageSelection: new Set(),
 	pageSelectionAnchor: null,
 	pageMultiSelect: false,
@@ -359,6 +361,12 @@ const el = {
 	pageCancel: document.querySelector("#pageCancel"),
 	saveButton: document.querySelector("#saveButton"),
 	createPanel: document.querySelector("#createPanel"),
+	createMode: document.querySelector("#createMode"),
+	createImages: document.querySelector("#createImages"),
+	createSize: document.querySelector("#createSize"),
+	createMargin: document.querySelector("#createMargin"),
+	createPosition: document.querySelector("#createPosition"),
+	createSubmit: document.querySelector("#createSubmit"),
 	createForm: document.querySelector("#createForm"),
 	createName: document.querySelector("#createName"),
 	createWidth: document.querySelector("#createWidth"),
@@ -886,6 +894,7 @@ el.addPageButton.addEventListener("change", async () => {
 	if (canvasEditor.input && !await canvasEditor.commitText()) return;
 	if (canvasEditor.crop && !await canvasEditor.commitCrop()) return;
 	if (action === "import") { openImportPanel(); return; }
+	if (action === "images") { openCreatePanel(true); return; }
 	const page = currentPageInfo();
 	return changeDocument("ofdgoChangePage", null, "add", state.pageIndex, page.width, page.height);
 });
@@ -1110,7 +1119,13 @@ el.editButton.addEventListener("click", toggleEditor);
 el.editButton.addEventListener("pointerdown", (event) => {
 	if (canvasEditor.input) event.preventDefault();
 });
-el.createCancel.addEventListener("click", () => el.createPanel.close());
+el.createCancel.addEventListener("click", () => state.imageImporting ? cancelExport() : el.createPanel.close());
+el.createPanel.addEventListener("cancel", event => {
+	if (state.imageImporting) { event.preventDefault(); cancelExport(); }
+});
+el.createPanel.addEventListener("close", () => { el.createImages.value = ""; });
+el.createMode.addEventListener("change", updateCreateOptions);
+el.createSize.addEventListener("change", updateCreateOptions);
 el.createForm.addEventListener("submit", createDocument);
 editorClick(el.insertTextButton, toggleTextTool);
 editorClick(el.insertImageButton, () => openInsertPanel());
@@ -1987,30 +2002,75 @@ function confirmTextReflow(item) {
 		|| window.confirm("将重新排版原文，是否继续？"));
 }
 
-function openCreatePanel() {
+function openCreatePanel(insert = false) {
 	if (document.body.hasAttribute("aria-busy")) {
 		return;
 	}
 	el.createForm.reset();
+	state.createInsert = insert === true;
+	el.createMode.value = state.createInsert ? "images" : "blank";
+	el.createSubmit.textContent = state.createInsert ? "插入" : "新建";
+	el.createPanel.setAttribute("aria-label", state.createInsert ? "插入图片" : "新建文档");
+	el.createCancel.disabled = false;
+	updateCreateOptions();
 	el.createStatus.textContent = "";
 	el.createPanel.showModal();
 }
 
+function updateCreateOptions() {
+	const images = el.createMode.value === "images", busy = Boolean(state.imageImporting);
+	const toggle = (id, visible) => { document.getElementById(id).hidden = !visible; };
+	toggle("createModeRow", !state.createInsert);
+	el.createName.closest(".form-row").hidden = Boolean(state.createInsert);
+	el.createName.disabled = busy || Boolean(state.createInsert);
+	el.createMode.disabled = busy;
+	for (const [id, input] of [["createImagesRow", el.createImages], ["createSizeRow", el.createSize], ["createMarginRow", el.createMargin]]) {
+		toggle(id, images);
+		input.disabled = busy || !images;
+	}
+	el.createImages.required = images;
+	const custom = !images || el.createSize.value === "custom";
+	toggle("createDimensions", custom);
+	el.createWidth.disabled = el.createHeight.disabled = busy || !custom;
+	toggle("createPositionRow", Boolean(state.createInsert));
+	el.createPosition.disabled = busy || !state.createInsert;
+	el.createSubmit.disabled = busy;
+}
+
+function imagePageRequest() {
+	const files = [...el.createImages.files].sort((a, b) => a.name.localeCompare(b.name, undefined, { numeric: true }));
+	const size = el.createSize.value;
+	return [files, {
+		Width: size === "image" ? 0 : Number(el.createWidth.value),
+		Height: size === "image" ? 0 : Number(el.createHeight.value),
+		Margin: Number(el.createMargin.value),
+	}];
+}
+
 async function createDocument(event) {
 	event.preventDefault();
+	if (state.createInsert) {
+		const at = { before: state.pageIndex, after: state.pageIndex + 1, first: 0, last: state.doc.pageCount }[el.createPosition.value];
+		if (await changeDocument("ofdgoImportImages", null, ...imagePageRequest(), at, "", state.renderAnnotations)) el.createPanel.close();
+		return;
+	}
 	if (document.body.hasAttribute("aria-busy") || !discardChanges()) {
 		return;
 	}
 	const title = el.createName.value.trim() || "未命名";
 	clearSecurityForms();
 	const openSeq = ++state.openSeq;
+	const images = el.createMode.value === "images";
+	state.imageImporting = images;
 	setBusy(true, "正在新建文档", null, "正在新建文档");
 	try {
 		await ensureWASM();
 		if (openSeq !== state.openSeq) {
 			return;
 		}
-		const doc = await callWASM("ofdgoCreateDocument", title, Number(el.createWidth.value), Number(el.createHeight.value), state.renderAnnotations);
+		const doc = images
+			? await callWASM("ofdgoImportImages", ...imagePageRequest(), -1, title, state.renderAnnotations)
+			: await callWASM("ofdgoCreateDocument", title, Number(el.createWidth.value), Number(el.createHeight.value), state.renderAnnotations);
 		if (openSeq !== state.openSeq) {
 			return;
 		}
@@ -2039,6 +2099,12 @@ async function createDocument(event) {
 			el.createStatus.textContent = err.message;
 		}
 	} finally {
+		if (images) {
+			state.imageImporting = false;
+			state.exportRequestID = 0;
+			el.cancelExportButton.hidden = true;
+			el.createCancel.disabled = false;
+		}
 		if (openSeq === state.openSeq) {
 			setBusy(false);
 			updateControls();
@@ -2731,7 +2797,8 @@ async function changeDocument(name, item, ...args) {
 	const before = editorLocation(), revision = state.editorInfo.revision;
 	const restoring = name === "ofdgoUndo" || name === "ofdgoRedo";
 	const { scrollLeft, scrollTop } = el.viewerPanel;
-	const importing = name === "ofdgoImportPages";
+	const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages";
+	state.imageImporting = name === "ofdgoImportImages";
 	if (importing) state.importing = true;
 	setBusy(true, importing ? "正在导入" : "", null);
 	try {
@@ -2847,6 +2914,8 @@ async function changeDocument(name, item, ...args) {
 				el.pageStatus.textContent = err.message;
 			} else if (el.paragraphPanel.open) {
 				el.paragraphStatus.textContent = err.message;
+			} else if (el.createPanel.open) {
+				el.createStatus.textContent = err.message;
 			} else if (el.importPanel.open) {
 				el.importStatus.textContent = err.message;
 			} else {
@@ -2856,6 +2925,8 @@ async function changeDocument(name, item, ...args) {
 	} finally {
 		if (importing) {
 			state.importing = false;
+			state.imageImporting = false;
+			el.createCancel.disabled = false;
 			state.exportRequestID = 0;
 			el.cancelExportButton.hidden = true;
 			el.importCancel.disabled = false;
@@ -3299,6 +3370,13 @@ async function loadWASM() {
 					}
 				}
 			} else if (data.type === "import") {
+				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && state.imageImporting) {
+					const text = data.phase === "commit" ? "正在完成" : `正在导入 ${data.completed} / ${data.total} 张`;
+					el.createStatus.textContent = text;
+					setProgress(text, data.total ? data.completed / data.total * 100 : null);
+					if (data.phase === "commit") el.createCancel.disabled = el.cancelExportButton.disabled = true;
+					return;
+				}
 				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && state.importing && !el.importCancel.disabled) {
 					const label = { ids: "正在检查", pages: "正在导入", resources: "正在读取", commit: "正在完成" }[data.phase];
 					el.importStatus.textContent = data.total ? `${label} ${data.completed} / ${data.total} 页` : label;
@@ -5100,7 +5178,10 @@ function cancelExport() {
 		return;
 	}
 	el.cancelExportButton.disabled = true;
-	if (state.importing) {
+	if (state.imageImporting) {
+		el.createCancel.disabled = true;
+		el.createStatus.textContent = "正在取消";
+	} else if (state.importing) {
 		el.importCancel.disabled = true;
 		el.importStatus.textContent = "正在取消";
 	}
@@ -7991,11 +8072,11 @@ async function callWASM(name, ...args) {
 			request.fontData = new Map();
 			args.push([...request.localFonts.keys()]);
 		}
-		if (name === "ofdgoExportImages" || name === "ofdgoConvertPDF" || name === "ofdgoExportPage" || name === "ofdgoExportDocument" || name === "ofdgoExportAttachment" || name === "ofdgoSaveDocument" || name === "ofdgoSaveEncrypted" || name === "ofdgoSaveSigned" || name === "ofdgoImportPages") {
+		if (name === "ofdgoImportImages" || name === "ofdgoExportImages" || name === "ofdgoConvertPDF" || name === "ofdgoExportPage" || name === "ofdgoExportDocument" || name === "ofdgoExportAttachment" || name === "ofdgoSaveDocument" || name === "ofdgoSaveEncrypted" || name === "ofdgoSaveSigned" || name === "ofdgoImportPages") {
 			state.exportRequestID = id;
 			el.cancelExportButton.hidden = false;
 			el.cancelExportButton.disabled = false;
-			el.cancelExportButton.title = { ofdgoConvertPDF: "取消转换", ofdgoSaveDocument: "取消保存", ofdgoSaveEncrypted: "取消保存", ofdgoSaveSigned: "取消签署", ofdgoImportPages: "取消导入", ofdgoExportAttachment: "取消下载" }[name] || "取消导出";
+			el.cancelExportButton.title = { ofdgoImportImages: "取消导入", ofdgoConvertPDF: "取消转换", ofdgoSaveDocument: "取消保存", ofdgoSaveEncrypted: "取消保存", ofdgoSaveSigned: "取消签署", ofdgoImportPages: "取消导入", ofdgoExportAttachment: "取消下载" }[name] || "取消导出";
 			el.cancelExportButton.setAttribute("aria-label", el.cancelExportButton.title);
 		}
 		try {
@@ -8026,7 +8107,8 @@ function setBusy(busy, text = "", percent = 0, status = "") {
 	renderSecurity();
 	updateDisplayControls();
 	el.editButton.disabled = busy || Boolean(sealPreview) || !state.doc || !state.ready || state.exporting;
-	el.createForm.inert = busy;
+	el.createForm.inert = busy && !state.imageImporting;
+	updateCreateOptions();
 	el.insertForm.inert = busy;
 	el.pageForm.inert = busy;
 	el.paragraphForm.inert = busy;

assets/webui/ofdgo_wasm.js

@@ -29,7 +29,7 @@ self.onmessage = ({ data }) => {
 		operations.get(data.id)?.abort();
 		return;
 	}
-	if (data.name === "ofdgoExportImages" || data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" || data.name === "ofdgoConvertPDF" || data.name === "ofdgoExportPage" || data.name === "ofdgoExportDocument" || data.name === "ofdgoExportAttachment" || data.name === "ofdgoSaveDocument" || data.name === "ofdgoSaveEncrypted" || data.name === "ofdgoSaveSigned" || data.name === "ofdgoImportPages") {
+	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 === "ofdgoSaveDocument" || data.name === "ofdgoSaveEncrypted" || data.name === "ofdgoSaveSigned" || data.name === "ofdgoImportPages") {
 		operations.set(data.id, new AbortController());
 	}
 	pending = pending.then(() => data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" ? handleBatchMessage(data) : handleMessage(data));
@@ -165,7 +165,7 @@ async function handleMessage({ id, name, args }) {
 	let output;
 	let channel;
 	const signal = operations.get(id)?.signal;
-	const importing = name === "ofdgoImportPages";
+	const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages";
 	const converting = name === "ofdgoConvertPDF";
 	const saving = name === "ofdgoSaveDocument" || name === "ofdgoSaveEncrypted" || name === "ofdgoSaveSigned";
 	const key = name === "ofdgoOpen" ? args[3]?.key : name === "ofdgoSaveSigned" || name === "ofdgoLoadImport" ? args[1]?.key : null;
@@ -173,6 +173,14 @@ async function handleMessage({ id, name, args }) {
 	const password = converting ? args[2] : name === "ofdgoOpen" ? args[3]?.password : name === "ofdgoSaveEncrypted" || name === "ofdgoLoadImport" ? args[1]?.password : null;
 	try {
 		signal?.throwIfAborted();
+		if (name === "ofdgoImportImages") {
+			const files = args[0], reader = new FileReaderSync();
+			args[0] = files.map(file => file.name);
+			args.push(index => {
+				try { return { bytes: new Uint8Array(reader.readAsArrayBuffer(files[index])) }; }
+				catch (err) { return { error: err.message }; }
+			});
+		}
 		const chunks = [];
 		let size = 0;
 		if (signal) {

internal/webui/wasm.go

@@ -210,6 +210,7 @@ func RunWASM() {
 	registerCallback("ofdgoFontFaces", fontFaces)
 	registerCallback("ofdgoFontFace", fontFace)
 	registerCallback("ofdgoCreateDocument", createDocument)
+	registerAsyncCallback("ofdgoImportImages", importImages)
 	registerCallback("ofdgoEditDocument", editDocument)
 	registerCallback("ofdgoUpdateInfo", updateInfo)
 	registerCallback("ofdgoChangePage", changePage)
@@ -3528,6 +3529,48 @@ func importPages(args []js.Value) (any, error) {
 	return editorPageInfo{info, at}, err
 }
 
+// importImages 逐张读取图片并建页，负数位置表示新建文档
+// 入参: args 文件名、选项、插入位置、标题、注解设置、读取与进度回调
+// 返回: any 文档信息, error 错误信息
+func importImages(args []js.Value) (any, error) {
+	var options ofdgo.ImagePageOptions
+	if err := json.Unmarshal([]byte(js.Global().Get("JSON").Call("stringify", args[1]).String()), &options); err != nil {
+		return nil, err
+	}
+	at := args[2].Int()
+	editor := currentEditor
+	if at < 0 {
+		editor = ofdgo.NewEditor()
+		editor.Info.Title = args[3].String()
+	} else if editor == nil {
+		return nil, fmt.Errorf("document is not editable")
+	}
+	if args[0].Length() == 0 {
+		return nil, fmt.Errorf("请选择图片")
+	}
+	sources := make([]ofdgo.ImagePageSource, args[0].Length())
+	for i := range sources {
+		sources[i] = ofdgo.ImagePageSource{Name: args[0].Index(i).String(), Read: func(context.Context) ([]byte, error) {
+			result := args[5].Invoke(i)
+			if message := result.Get("error"); message.Type() == js.TypeString {
+				return nil, fmt.Errorf("%s", message.String())
+			}
+			return bytesFromJS(result.Get("bytes"))
+		}}
+	}
+	options.OnProgress = editorOperationProgress(args[6])
+	position := max(at, 0)
+	if err := editor.ImportImages(context.Background(), sources, position, options); err != nil {
+		return nil, err
+	}
+	if at < 0 {
+		editor.SetHistoryLimit(100)
+	}
+	clearImport()
+	info, err := previewEditor(editor, args[4].Bool())
+	return editorPageInfo{info, position}, err
+}
+
 // createDocument 新建单页文档
 // 入参: args 标题、纸张宽高和注解设置
 // 返回: any 文档信息, error 错误信息

ofdgo_editor_images.go

@@ -0,0 +1,173 @@
+// 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"
+	"fmt"
+	"image"
+	"math"
+)
+
+// ImagePageSource 图片页面来源，按列表顺序逐张读取，每张图片处理完成后不再引用返回数据
+// Read不可重入修改编辑器，取消时应返回上下文错误
+type ImagePageSource struct {
+	Name string
+	Read func(context.Context) ([]byte, error)
+}
+
+// ImagePageOptions 图片建页选项，尺寸和边距单位为毫米
+// Width和Height均为零时随图建页，否则按纸张等比居中，不裁剪图片
+// DPI为缺少物理尺寸时的分辨率，零值使用96；图片方向和有效密度优先采用原图信息
+// OnProgress按images、commit阶段回报进度，返回错误则撤销整个操作，不可重入修改编辑器
+type ImagePageOptions struct {
+	Width, Height float64
+	Margin        float64
+	DPI           float64
+	OnProgress    func(stage string, completed, total int) error
+}
+
+// ImportImages 将PNG、JPEG或JBIG2逐张建页并插入指定位置，一次操作计入一条撤销记录
+// 保留像素及透明度，方向通过对象变换实现，不重新采样；图片压缩沿用AddImage规则
+// 失败或取消时不修改文档，读取期间仍需容纳单张图片的解码数据
+// 入参: ctx 取消上下文, sources 按页面顺序排列的图片, at 插入位置, options 建页选项
+// 返回: error 错误信息
+func (e *Editor) ImportImages(ctx context.Context, sources []ImagePageSource, at int, options ImagePageOptions) error {
+	if at < 0 || at > len(e.pages) {
+		return fmt.Errorf("page index %d out of range", at)
+	}
+	if !finite(options.Width) || !finite(options.Height) || !finite(options.Margin) || !finite(options.DPI) || options.Margin < 0 || options.DPI < 0 {
+		return fmt.Errorf("invalid image page options")
+	}
+	if (options.Width != 0 || options.Height != 0) && (options.Width <= 2*options.Margin || options.Height <= 2*options.Margin) {
+		return fmt.Errorf("page margins leave no image area")
+	}
+	if options.DPI == 0 {
+		options.DPI = 96
+	}
+	for _, source := range sources {
+		if source.Read == nil {
+			return fmt.Errorf("image %q has no reader", source.Name)
+		}
+	}
+	check := func(stage string, completed int) error {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		if options.OnProgress != nil {
+			if err := options.OnProgress(stage, completed, len(sources)); err != nil {
+				return err
+			}
+		}
+		return ctx.Err()
+	}
+	if err := check("images", 0); err != nil || len(sources) == 0 {
+		return err
+	}
+	return e.Transaction(func(e *Editor) error {
+		indexes := make([]int, 0, len(sources))
+		for i, source := range sources {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+			data, err := source.Read(ctx)
+			if err != nil {
+				return fmt.Errorf("image %q: %w", source.Name, err)
+			}
+			page, err := e.addImagePage(data, options)
+			if err != nil {
+				return fmt.Errorf("image %q: %w", source.Name, err)
+			}
+			indexes = append(indexes, page)
+			if err := check("images", i+1); err != nil {
+				return err
+			}
+		}
+		if err := e.MovePages(indexes, at); err != nil {
+			return err
+		}
+		return check("commit", len(sources))
+	})
+}
+
+// addImagePage 保留原图并按方向、物理尺寸与纸张选项建页
+func (e *Editor) addImagePage(data []byte, options ImagePageOptions) (int, error) {
+	config, format, err := image.DecodeConfig(bytes.NewReader(data))
+	if err != nil {
+		return 0, err
+	}
+	if format != "png" && format != "jpeg" && format != "jbig2" {
+		return 0, fmt.Errorf("only PNG, JPEG and JBIG2 images are supported")
+	}
+	if _, _, err := image.Decode(bytes.NewReader(data)); err != nil {
+		return 0, err
+	}
+	metadata, err := imagePageMetadata(data, format, options.DPI)
+	if err != nil {
+		return 0, err
+	}
+	w, h := float64(config.Width)*25.4/metadata.xdpi, float64(config.Height)*25.4/metadata.ydpi
+	if metadata.orientation >= 5 {
+		w, h = h, w
+	}
+	pw, ph := options.Width, options.Height
+	if pw == 0 && ph == 0 {
+		pw, ph = w+2*options.Margin, h+2*options.Margin
+	} else {
+		scale := math.Min((pw-2*options.Margin)/w, (ph-2*options.Margin)/h)
+		w, h = w*scale, h*scale
+	}
+	if !finite(w) || !finite(h) || w <= 0 || h <= 0 {
+		return 0, fmt.Errorf("invalid image page dimensions")
+	}
+	resource, err := e.AddImage(data)
+	if err != nil {
+		return 0, err
+	}
+	page, err := e.AddPage(pw, ph)
+	if err != nil {
+		return 0, err
+	}
+	matrix := imagePageOrientation(metadata.orientation, w, h)
+	_, err = e.AddObject(page, GraphicObject{Type: "ImageObject", ImageObject: ImageObject{
+		ResourceID: resource,
+		Boundary:   fmt.Sprintf("%s %s %s %s", ofdNumber((pw-w)/2), ofdNumber((ph-h)/2), ofdNumber(w), ofdNumber(h)),
+		CTM:        matrix.String(),
+	}})
+	return page, err
+}
+
+// imagePageOrientation 将EXIF方向映射为单位图像到页面局部坐标的变换
+func imagePageOrientation(orientation int, w, h float64) Matrix {
+	switch orientation {
+	case 2:
+		return Matrix{a: -w, d: h, e: w}
+	case 3:
+		return Matrix{a: -w, d: -h, e: w, f: h}
+	case 4:
+		return Matrix{a: w, d: -h, f: h}
+	case 5:
+		return Matrix{b: h, c: w}
+	case 6:
+		return Matrix{b: h, c: -w, e: w}
+	case 7:
+		return Matrix{b: -h, c: -w, e: w, f: h}
+	case 8:
+		return Matrix{b: -h, c: w, f: h}
+	default:
+		return Matrix{a: w, d: h}
+	}
+}

ofdgo_image_metadata.go

@@ -0,0 +1,189 @@
+// 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"
+	"encoding/binary"
+	"fmt"
+	"hash/crc32"
+)
+
+// imagePageInfo 图片方向与像素密度，不改变原始编码
+type imagePageInfo struct {
+	orientation int
+	xdpi, ydpi  float64
+}
+
+// imagePageMetadata 读取PNG物理尺寸与JPEG的JFIF、EXIF信息，EXIF密度优先于JFIF
+func imagePageMetadata(data []byte, format string, dpi float64) (imagePageInfo, error) {
+	info := imagePageInfo{orientation: 1, xdpi: dpi, ydpi: dpi}
+	var exif []byte
+	if format == "png" {
+		for offset := 8; offset+12 <= len(data); {
+			n := uint64(binary.BigEndian.Uint32(data[offset:]))
+			if n > uint64(len(data)-offset-12) {
+				return info, fmt.Errorf("truncated PNG chunk")
+			}
+			end := offset + 8 + int(n)
+			kind, payload := string(data[offset+4:offset+8]), data[offset+8:end]
+			if kind == "pHYs" || kind == "eXIf" {
+				if crc32.ChecksumIEEE(data[offset+4:end]) != binary.BigEndian.Uint32(data[end:]) {
+					return info, fmt.Errorf("invalid PNG %s checksum", kind)
+				}
+			}
+			if kind == "pHYs" && len(payload) == 9 {
+				x, y := float64(binary.BigEndian.Uint32(payload)), float64(binary.BigEndian.Uint32(payload[4:]))
+				if x > 0 && y > 0 {
+					if payload[8] == 1 {
+						info.xdpi, info.ydpi = x*0.0254, y*0.0254
+					} else if payload[8] == 0 {
+						info.ydpi = dpi * y / x
+					}
+				}
+			} else if kind == "eXIf" {
+				exif = payload
+			}
+			offset = end + 4
+			if kind == "IEND" {
+				break
+			}
+		}
+	} else if format == "jpeg" {
+		for offset := 2; offset < len(data); {
+			if data[offset] != 0xff {
+				return info, fmt.Errorf("invalid JPEG marker")
+			}
+			for offset < len(data) && data[offset] == 0xff {
+				offset++
+			}
+			if offset >= len(data) {
+				break
+			}
+			marker := data[offset]
+			offset++
+			if marker == 0xda || marker == 0xd9 {
+				break
+			}
+			if marker == 0x01 || marker >= 0xd0 && marker <= 0xd7 {
+				continue
+			}
+			if offset+2 > len(data) {
+				return info, fmt.Errorf("truncated JPEG marker")
+			}
+			n := int(binary.BigEndian.Uint16(data[offset:]))
+			if n < 2 || n > len(data)-offset {
+				return info, fmt.Errorf("truncated JPEG segment")
+			}
+			payload := data[offset+2 : offset+n]
+			if marker == 0xe0 && len(payload) >= 14 && bytes.Equal(payload[:5], []byte("JFIF\x00")) {
+				x, y := float64(binary.BigEndian.Uint16(payload[8:])), float64(binary.BigEndian.Uint16(payload[10:]))
+				if x > 0 && y > 0 {
+					switch payload[7] {
+					case 0:
+						info.ydpi = dpi * y / x
+					case 1:
+						info.xdpi, info.ydpi = x, y
+					case 2:
+						info.xdpi, info.ydpi = x*2.54, y*2.54
+					}
+				}
+			} else if marker == 0xe1 && bytes.HasPrefix(payload, []byte("Exif\x00\x00")) {
+				exif = payload[6:]
+			}
+			offset += n
+		}
+	}
+	if len(exif) != 0 {
+		orientation, x, y, err := imageExifMetadata(exif)
+		if err != nil {
+			return info, err
+		}
+		info.orientation = orientation
+		// PNG的物理尺寸由pHYs定义，EXIF只用于方向。
+		if format == "jpeg" && x > 0 && y > 0 {
+			info.xdpi, info.ydpi = x, y
+		}
+	}
+	return info, nil
+}
+
+// imageExifMetadata 只读取主图IFD中的方向和密度，不跟随缩略图与其他目录
+func imageExifMetadata(data []byte) (int, float64, float64, error) {
+	invalid := fmt.Errorf("invalid EXIF image metadata")
+	if len(data) < 8 {
+		return 0, 0, 0, invalid
+	}
+	var order binary.ByteOrder
+	switch string(data[:2]) {
+	case "II":
+		order = binary.LittleEndian
+	case "MM":
+		order = binary.BigEndian
+	default:
+		return 0, 0, 0, invalid
+	}
+	if order.Uint16(data[2:]) != 42 {
+		return 0, 0, 0, invalid
+	}
+	offset := uint64(order.Uint32(data[4:]))
+	if offset < 8 || offset+2 > uint64(len(data)) {
+		return 0, 0, 0, invalid
+	}
+	count := uint64(order.Uint16(data[offset:]))
+	if count*12+offset+6 > uint64(len(data)) {
+		return 0, 0, 0, invalid
+	}
+	orientation, unit := 1, 2
+	var x, y float64
+	for i := uint64(0); i < count; i++ {
+		entry := data[offset+2+i*12 : offset+14+i*12]
+		tag, kind, count := order.Uint16(entry), order.Uint16(entry[2:]), order.Uint32(entry[4:])
+		switch tag {
+		case 0x112, 0x128:
+			if kind != 3 || count != 1 {
+				return 0, 0, 0, invalid
+			}
+			value := int(order.Uint16(entry[8:]))
+			if tag == 0x112 {
+				if value < 1 || value > 8 {
+					return 0, 0, 0, invalid
+				}
+				orientation = value
+			} else {
+				unit = value
+			}
+		case 0x11a, 0x11b:
+			at := uint64(order.Uint32(entry[8:]))
+			if kind != 5 || count != 1 || at+8 > uint64(len(data)) {
+				return 0, 0, 0, invalid
+			}
+			n, d := order.Uint32(data[at:]), order.Uint32(data[at+4:])
+			if n > 0 && d > 0 {
+				if tag == 0x11a {
+					x = float64(n) / float64(d)
+				} else {
+					y = float64(n) / float64(d)
+				}
+			}
+		}
+	}
+	if unit == 3 {
+		x, y = x*2.54, y*2.54
+	} else if unit != 2 {
+		x, y = 0, 0
+	}
+	return orientation, x, y, nil
+}

ofdgo_renderer_output_canvas.go

@@ -48,9 +48,14 @@ func (CanvasBackend) RenderSVG(r *Renderer, page *PageContent, writer io.Writer,
 			return SVGResources{}, err
 		}
 		buffer := bufio.NewWriter(writer)
-		renderer := svg.New(buffer, c.W, c.H, nil)
+		renderer := &svgResourceRenderer{SVG: svg.New(buffer, c.W, c.H, nil), writer: buffer, embeddedFonts: true}
 		io.WriteString(buffer, svgCreatorMetadata)
+		io.WriteString(buffer, `<g style="image-orientation:none">`)
 		c.RenderTo(renderer)
+		if renderer.err != nil {
+			return SVGResources{}, renderer.err
+		}
+		io.WriteString(buffer, `</g>`)
 		if err := renderer.Close(); err != nil {
 			return SVGResources{}, err
 		}

ofdgo_renderer_svg_canvas.go

@@ -18,6 +18,7 @@ import (
 	"bufio"
 	"bytes"
 	"crypto/sha256"
+	"encoding/base64"
 	"fmt"
 	"html"
 	"image"
@@ -36,16 +37,17 @@ const svgCreatorMetadata = `<metadata>` + creatorXMP + `</metadata>`
 // svgResourceRenderer 分离外部资源的SVG渲染器
 type svgResourceRenderer struct {
 	*svg.SVG
-	renderer    *Renderer
+	renderer      *Renderer
-	writer      io.Writer
+	writer        io.Writer
-	fonts       []SVGFont
+	fonts         []SVGFont
-	images      []SVGImage
+	images        []SVGImage
-	imageNames  map[image.Image]string
+	imageNames    map[image.Image]string
-	seen        map[string]bool
+	seen          map[string]bool
-	styles      strings.Builder
+	styles        strings.Builder
-	err         error
+	err           error
-	objects     map[*GraphicObject]string
+	objects       map[*GraphicObject]string
-	objectStack []svgObjectGroup
+	objectStack   []svgObjectGroup
+	embeddedFonts bool
 }
 
 // svgObjectGroup 记录编辑分组的稳定路径，不把底纹内部绘制当作成员
@@ -58,13 +60,10 @@ type svgObjectGroup struct {
 // RenderImage 绘制图片，分离资源时保持原始编码、尺寸和变换
 // 入参: img 图片对象, m 变换矩阵
 func (s *svgResourceRenderer) RenderImage(img image.Image, m canvas.Matrix) {
-	if s.imageNames == nil {
-		s.SVG.RenderImage(img, m)
-		return
-	}
 	name, ok := s.imageNames[img]
+	var resource SVGImage
 	if !ok {
-		resource := SVGImage{MIME: "image/png"}
+		resource = SVGImage{MIME: "image/png"}
 		if encoded, ok := img.(*canvasimage.Image); ok {
 			resource.MIME, resource.Data = encoded.Mimetype, encoded.Bytes
 		} else {
@@ -75,22 +74,46 @@ func (s *svgResourceRenderer) RenderImage(img image.Image, m canvas.Matrix) {
 			}
 			resource.Data = buffer.Bytes()
 		}
-		name = fmt.Sprintf("ofdgo-image-%x", sha256.Sum256(resource.Data))
+		if s.imageNames != nil {
-		resource.Name = name
+			name = fmt.Sprintf("ofdgo-image-%x", sha256.Sum256(resource.Data))
-		s.imageNames[img] = name
+			resource.Name = name
-		if !s.seen[name] {
+			s.imageNames[img] = name
-			s.seen[name] = true
+			if !s.seen[name] {
-			s.images = append(s.images, resource)
+				s.seen[name] = true
+				s.images = append(s.images, resource)
+			}
 		}
 	}
 	_, height := s.Size()
 	size := img.Bounds().Size()
-	fmt.Fprintf(s.writer, `<image transform="%s" width="%d" height="%d" xlink:href="%s"/>`, m.Translate(0, float64(size.Y)).ToSVG(height), size.X, size.Y, name)
+	m = m.Translate(0, float64(size.Y))
+	// 直接写出换轴后的矩阵，原坐标平移为零时仍需保留页面高度补偿。
+	matrix := Matrix{a: m[0][0], b: -m[1][0], c: -m[0][1], d: m[1][1], e: m[0][2], f: height - m[1][2]}
+	fmt.Fprintf(s.writer, `<image transform="matrix(%s)" width="%d" height="%d" xlink:href="`, matrix.String(), size.X, size.Y)
+	if s.imageNames != nil {
+		io.WriteString(s.writer, name)
+	} else {
+		fmt.Fprintf(s.writer, "data:%s;base64,", resource.MIME)
+		encoder := base64.NewEncoder(base64.StdEncoding, s.writer)
+		if _, err := encoder.Write(resource.Data); err != nil {
+			s.err = err
+			return
+		}
+		if err := encoder.Close(); err != nil {
+			s.err = err
+			return
+		}
+	}
+	io.WriteString(s.writer, `"/>`)
 }
 
 // RenderText 绘制文字并记录实际使用的字体资源
 // 入参: text 文字对象, m 变换矩阵
 func (s *svgResourceRenderer) RenderText(text *canvas.Text, m canvas.Matrix) {
+	if s.embeddedFonts {
+		s.SVG.RenderText(text, m)
+		return
+	}
 	if text.Empty() {
 		return
 	}
@@ -137,6 +160,8 @@ func (r *Renderer) renderSVGResources(page *PageContent, writer io.Writer, image
 		seen:     make(map[string]bool),
 	}
 	io.WriteString(buffer, svgCreatorMetadata)
+	// 图片方向由文档变换决定，不再由浏览器应用EXIF方向。
+	io.WriteString(buffer, `<g style="image-orientation:none">`)
 	if images {
 		s.imageNames = make(map[image.Image]string)
 	}
@@ -161,6 +186,7 @@ func (r *Renderer) renderSVGResources(page *PageContent, writer io.Writer, image
 	if s.err != nil {
 		return SVGResources{}, s.err
 	}
+	io.WriteString(buffer, `</g>`)
 	s.SetCustomStyle(s.styles.String())
 	if err := s.Close(); err != nil {
 		return SVGResources{}, err