feat(压缩能力): 优化多档压缩与资源复用

assets/webui/index.html

@@ -51,13 +51,13 @@
 			</div>
 			<div class="tool-group" role="group" aria-label="导出">
 				<label class="toolbar-select"><select id="exportFormat" class="format-select" title="导出格式" aria-label="导出格式" disabled></select><span id="formatValue" aria-hidden="true"></span></label>
-				<label class="toolbar-select"><select id="imageDPI" class="format-select" title="DPI" aria-label="DPI" disabled>
+				<label class="toolbar-select"><select id="imageDPI" class="format-select" title="输出精度" aria-label="输出精度" disabled>
 					<option value="96">96 dpi</option>
 					<option value="150">150 dpi</option>
 					<option value="300" selected>300 dpi</option>
 					<option value="600">600 dpi</option>
 				</select><span id="dpiValue" aria-hidden="true">300</span></label>
-				<label class="toolbar-select"><select id="outputCompression" class="format-select" title="压缩" aria-label="压缩" disabled><option value="0">默认</option><option value="1">无损</option><option value="2">轻压</option><option value="3">均衡</option><option value="4">强压</option></select><span id="compressionValue" data-short="默" aria-hidden="true">默认</span></label>
+				<label class="toolbar-select"><select id="outputCompression" class="format-select" title="压缩模式" aria-label="压缩模式" disabled><option value="0">默认</option><option value="1">无损</option><option value="2">轻压</option><option value="3">均衡</option><option value="4">强压</option></select><span id="compressionValue" data-short="默" aria-hidden="true">默认</span></label>
 				<button id="exportPageButton" class="button" type="button" data-short="单" title="导出单页" aria-label="导出单页" disabled>单页</button>
 				<button id="exportButton" class="button" type="button" data-short="多" title="导出文档" aria-label="导出文档" aria-haspopup="dialog" aria-controls="exportPanel" disabled>文档</button>
 			</div>

assets/webui/ofdgo.js

@@ -2806,7 +2806,7 @@ async function changeDocument(name, item, ...args) {
 	const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages";
 	state.imageImporting = name === "ofdgoImportImages";
 	if (importing) state.importing = true;
-	setBusy(true, importing ? "正在导入" : "", null);
+	setBusy(true, importing ? "正在导入页面" : "", null);
 	try {
 		args = await Promise.all(args);
 		if (openSeq !== state.openSeq) {
@@ -3352,11 +3352,11 @@ async function loadWASM() {
 				setProgress(data.text, data.percent);
 			} else if (data.type === "conversion") {
 				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && !el.cancelExportButton.disabled) {
-					if (data.phase === "open") setProgress("正在读取 PDF", null);
+					if (data.phase === "open") setProgress("正在读取文档", null);
-					else if (data.phase === "pages") setProgress(data.completed ? `正在整理 ${data.completed} 页` : "正在整理页面", null);
+					else if (data.phase === "pages") setProgress(data.completed ? `正在整理页面 · ${data.completed} 页` : "正在整理页面", null);
-					else if (data.phase === "convert") setProgress(`正在转换 ${data.completed} / ${data.total} 页`, data.total ? 28 + data.completed / data.total * 22 : null);
+					else if (data.phase === "convert") setProgress(`正在转换页面 · ${data.completed} / ${data.total} 页`, data.total ? 28 + data.completed / data.total * 22 : null);
 					else if (data.phase === "write.fonts") setProgress("正在处理字体", null);
-					else setProgress("正在生成 OFD", null);
+					else setProgress("正在生成文档", null);
 				}
 			} else if (data.type === "export") {
 				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && state.exporting) {
@@ -3377,15 +3377,15 @@ 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`;
+					const text = data.phase === "commit" ? "正在完成导入" : `正在导入图片 · ${data.completed} / ${data.total} 张`;
 					el.createStatus.textContent = text;
 					setProgress(text, data.total ? data.completed / data.total * 100 : null);
 					if (data.phase === "commit") el.createCancel.disabled = el.cancelExportButton.disabled = true;
 					return;
 				}
 				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && state.importing && !el.importCancel.disabled) {
-					const label = { ids: "正在检查", pages: "正在导入", resources: "正在读取", commit: "正在完成" }[data.phase];
+					const label = { ids: "正在检查标识", pages: "正在导入页面", resources: "正在读取资源", commit: "正在完成导入" }[data.phase];
-					el.importStatus.textContent = data.total ? `${label} ${data.completed} / ${data.total} 页` : label;
+					el.importStatus.textContent = data.total ? `${label} · ${data.completed} / ${data.total} 页` : label;
 					setProgress(label, data.total ? data.completed / data.total * 100 : null);
 					if (data.phase === "commit") el.importCancel.disabled = el.cancelExportButton.disabled = true;
 				}
@@ -3508,7 +3508,7 @@ async function downloadRemoteDocument(options) {
 				if (done) break;
 				chunks.push(value);
 				received += value.byteLength;
-				setProgress(`正在下载 ${(received / 1048576).toFixed(1)} MB`, total > 0 && received <= total ? received / total * 20 : null);
+				setProgress(`正在下载文档 · ${(received / 1048576).toFixed(1)} MB`, total > 0 && received <= total ? received / total * 20 : null);
 			}
 		} finally { reader.releaseLock(); }
 		controller.signal.throwIfAborted();
@@ -3562,7 +3562,7 @@ async function openOFD(file, remote = null) {
 			return;
 		}
 		if (downloaded ? downloaded.pdf : /\.pdf$/i.test(file.name || "")) {
-			setProgress("正在转换 PDF", 25);
+			setProgress("正在转换文档", 25);
 			await ensureWASM();
 			if (openSeq !== state.openSeq) return;
 			let converted;
@@ -3646,7 +3646,7 @@ async function openSelectedFonts(event) {
 	try {
 		const fonts = [];
 		for (let i = 0; i < files.length; i += 1) {
-			setProgress(`正在读取字体 ${i + 1} / ${files.length}`, 10 + Math.round(i / files.length * 60));
+			setProgress(`正在读取字体 · ${i + 1} / ${files.length}`, 10 + Math.round(i / files.length * 60));
 			const file = files[i];
 			fonts.push(fontManager.record(file.name, new Uint8Array(await file.arrayBuffer()), "upload"));
 		}
@@ -3755,7 +3755,7 @@ async function loadDocumentLocalFonts(available, openSeq = state.openSeq) {
 	const emptyStatus = available.length === 0 ? "暂无系统字体" : "暂无匹配字体";
 	const fonts = [];
 	for (let i = 0; i < selected.length; i += 1) {
-		setProgress(`正在读取字体 ${i + 1} / ${selected.length}`, 20 + Math.round(i / selected.length * 60));
+		setProgress(`正在读取字体 · ${i + 1} / ${selected.length}`, 20 + Math.round(i / selected.length * 60));
 		const item = selected[i];
 		const data = await fontManager.read(item);
 		if (openSeq !== state.openSeq) {
@@ -4103,7 +4103,7 @@ async function openWithCredentials(fonts, openSeq, data = state.ofdBytes, import
 					canceled.name = "AbortError";
 					throw canceled;
 				}
-				setProgress(pdf ? "正在读取 PDF" : "正在解析文档", null);
+				setProgress(pdf ? "正在读取文档" : "正在解析文档", null);
 				el.progressPanel.hidden = false;
 			}
 		}
@@ -4469,7 +4469,7 @@ function renderSecurity() {
 function cancelSigning() {
 	if (el.signCancel.disabled) return;
 	state.signCanceled = true;
-	el.signStatus.textContent = "正在取消";
+	el.signStatus.textContent = "正在取消操作";
 	cancelExport();
 }
 
@@ -4681,7 +4681,7 @@ async function verifyDocument(event) {
 	event.preventDefault();
 	if (!state.doc || document.body.hasAttribute("aria-busy")) return;
 	const openSeq = state.openSeq;
-	setBusy(true, "正在验签", null, "正在验签");
+	setBusy(true, "正在验证签名", null, "正在验证签名");
 	el.verifyForm.inert = true;
 	try {
 		const options = {
@@ -4733,7 +4733,7 @@ async function updateExportRange() {
 	el.exportRangeRow.hidden = !specified;
 	el.exportRange.removeAttribute("aria-invalid");
 	el.exportSubmit.disabled = specified;
-	el.exportRangeStatus.textContent = specified && value ? "正在校验" : "";
+	el.exportRangeStatus.textContent = specified && value ? "正在校验页码" : "";
 	if (!specified || !value) {
 		return;
 	}
@@ -4952,7 +4952,7 @@ function startBatchWorker() {
 function cancelBatch() {
 	batch.canceled = true;
 	batchElements.Cancel.disabled = true;
-	batchElements.Status.textContent = "正在取消";
+	batchElements.Status.textContent = "正在取消操作";
 	if (batch.activeID) batch.worker.postMessage({ type: "cancel", id: batch.activeID });
 }
 
@@ -5201,12 +5201,12 @@ function cancelExport() {
 	el.cancelExportButton.disabled = true;
 	if (state.imageImporting) {
 		el.createCancel.disabled = true;
-		el.createStatus.textContent = "正在取消";
+		el.createStatus.textContent = "正在取消操作";
 	} else if (state.importing) {
 		el.importCancel.disabled = true;
-		el.importStatus.textContent = "正在取消";
+		el.importStatus.textContent = "正在取消操作";
 	}
-	setProgress("正在取消", null);
+	setProgress("正在取消操作", null);
 	wasmWorker.postMessage({ type: "cancel", id: state.exportRequestID });
 }
 
@@ -5872,7 +5872,7 @@ async function selectDocumentText() {
 	const count = state.doc.pageCount;
 	try {
 		for (let index = 0; index < count; index += 1) {
-			setStatus(`正在全选 ${index + 1} / ${count} 页`);
+			setStatus(`正在全选文字 · ${index + 1} / ${count} 页`);
 			const text = await callWASM("ofdgoPageTextString", index);
 			if (!active()) {
 				return;
@@ -6415,7 +6415,7 @@ async function searchDocument() {
 			if (seq !== state.searchSeq || openSeq !== state.openSeq) {
 				return;
 			}
-			el.searchStatus.textContent = `正在搜索 ${page + 1} / ${pageCount} 页`;
+			el.searchStatus.textContent = `正在搜索文字 · ${page + 1} / ${pageCount} 页`;
 			if (!matches?.length) {
 				continue;
 			}
@@ -7158,7 +7158,7 @@ function renderMeta(keepDetails = false) {
 	el.metaFonts.textContent = String(doc.fontCount || 0);
 	el.pageTotal.textContent = String(doc.pageCount || 0);
 	if (keepDetails && doc.detailsPending) return;
-	el.metaSignatures.textContent = doc.detailsPending ? "正在检查" : doc.detailsError ? "读取失败" : String(doc.signatureCount || 0);
+	el.metaSignatures.textContent = doc.detailsPending ? "正在检查签名" : doc.detailsError ? "读取失败" : String(doc.signatureCount || 0);
 	renderMetaContent(el.attachmentList, [doc.attachments, doc.attachmentError], renderAttachments);
 	renderMetaContent(el.signatureList, [doc.signatures, doc.signatureError], renderSignatures);
 	renderMetaContent(el.docFontList, doc.fonts || [], renderDocumentFonts);
@@ -8228,7 +8228,7 @@ function exportFormatUsesDPI(value) {
 
 function updateDPIControl() {
 	el.imageDPI.disabled = state.exporting || !state.doc || document.body.hasAttribute("aria-busy") || (displayMode() !== "raster" && !exportFormatUsesDPI(el.exportFormat.value));
-	el.imageDPI.title = `DPI：${currentImageDPI()}`;
+	el.imageDPI.title = `输出精度：${currentImageDPI()} DPI`;
 	el.dpiValue.textContent = String(currentImageDPI());
 	const format = exportFormatInfo(el.exportFormat.value);
 	el.formatValue.textContent = format?.label || "";

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/jbig2 v1.1.1
-	github.com/xiaoqidun/pdfgo v0.0.0-20260929133432-1988ce19768e
+	github.com/xiaoqidun/pdfgo v0.0.0-20260929145256-b04a96874771
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0

go.sum

@@ -62,8 +62,8 @@ github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/xiaoqidun/jbig2 v1.1.1 h1:SjliS9ZO0e9HX5oYUfBuXrfFsXhWricrSz+XY4zORDI=
 github.com/xiaoqidun/jbig2 v1.1.1/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
-github.com/xiaoqidun/pdfgo v0.0.0-20260929133432-1988ce19768e h1:mO1e6Z6RgCrTdPOO7zH1w1oUmSLFRBMijkOCQAlqit4=
+github.com/xiaoqidun/pdfgo v0.0.0-20260929145256-b04a96874771 h1:qddSlHkgZhRMyawpOS3TlW5nu8+IurZFjxS4Kwg8YLA=
-github.com/xiaoqidun/pdfgo v0.0.0-20260929133432-1988ce19768e/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
+github.com/xiaoqidun/pdfgo v0.0.0-20260929145256-b04a96874771/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
 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=

ofdgo_compression.go

@@ -63,6 +63,7 @@ type outputOptimization struct {
 	protected bool
 	completed int
 	deflater  *flate.Writer
+	optimized map[string]bool
 }
 
 // WriteToWithOptions 按压缩策略写出OFD，签名文档不额外改写资源内容
@@ -275,7 +276,7 @@ func (e *Editor) writeOutputEntry(archive *zip.Writer, header zip.FileHeader, da
 	if err := editorProgress(e.OnWriteProgress).report("compress", e.output.completed, 0); err != nil {
 		return err
 	}
-	if lossy, ok := e.output.images[strings.ToLower(cleanPackagePath(header.Name))]; ok {
+	if lossy, ok := e.output.images[strings.ToLower(cleanPackagePath(header.Name))]; ok && !e.output.optimized[strings.ToLower(cleanPackagePath(header.Name))] {
 		options := e.output.options
 		if !lossy {
 			options.Mode = CompressionLossless

ofdgo_compression_resources.go

@@ -0,0 +1,263 @@
+// 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/sha256"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"maps"
+	"path"
+	"slices"
+	"strings"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// 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
+func (e *Editor) compressResourceParts(parts map[string][]byte, reader *Reader, removed map[string]bool) error {
+	if e.output == nil || e.output.options.Mode == CompressionUnchanged || e.output.protected {
+		return nil
+	}
+	names := make(map[string]bool)
+	if reader != nil {
+		for name := range reader.fileIndex {
+			names[name] = true
+		}
+		for name := range reader.files {
+			names[name] = true
+		}
+	}
+	for name := range parts {
+		names[name] = true
+	}
+	read := func(name string) ([]byte, error) {
+		if data, ok := parts[name]; ok {
+			return data, nil
+		}
+		return reader.readFile(name)
+	}
+	refs := editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool), fonts: make(map[string]*editorFontUsage)}
+	var resources []string
+	actual := make(map[string]string)
+	for _, name := range slices.Sorted(maps.Keys(names)) {
+		if err := e.output.ctx.Err(); err != nil {
+			return err
+		}
+		key := strings.ToLower(cleanPackagePath(name))
+		if removed[key] || strings.HasSuffix(name, "/") {
+			continue
+		}
+		if prior, ok := actual[key]; ok && prior != name {
+			return nil
+		}
+		actual[key] = name
+		var input io.ReadCloser
+		if data, ok := parts[name]; ok {
+			input = io.NopCloser(bytes.NewReader(data))
+		} else {
+			var err error
+			input, err = reader.openFile(name)
+			if err != nil {
+				return err
+			}
+		}
+		resource, safe := refs.scan(input, name)
+		input.Close()
+		if !safe {
+			return nil
+		}
+		if resource {
+			resources = append(resources, name)
+		}
+	}
+	type resourceFile struct{ key, role string }
+	files := make(map[resourceFile]bool)
+	for _, name := range resources {
+		data, err := read(name)
+		if err != nil {
+			return err
+		}
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return err
+		}
+		for _, group := range root.children {
+			for _, node := range group.children {
+				field := ""
+				if group.name.Local == "Fonts" && node.name.Local == "Font" {
+					field = "FontFile"
+				}
+				if group.name.Local == "MultiMedias" && node.name.Local == "MultiMedia" {
+					field = "MediaFile"
+				}
+				if field == "" {
+					continue
+				}
+				file := node.child(field)
+				if file == nil {
+					continue
+				}
+				var value string
+				if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
+					return err
+				}
+				key := editorResourceLocation(name, root.attr("BaseLoc"), value)
+				if field == "MediaFile" && node.attr("Type") != "Image" {
+					refs.files[key] = true
+					continue
+				}
+				if key != strings.ToLower(cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))) {
+					return nil
+				}
+				if actual[key] != "" && !refs.files[key] {
+					files[resourceFile{key, field}] = true
+				}
+			}
+		}
+	}
+	aliases := make(map[string]string)
+	locations := maps.Clone(actual)
+	reserved := make(map[string]bool, len(actual))
+	for key := range actual {
+		reserved[key] = true
+	}
+	formats := make(map[string]string)
+	seen := make(map[string]map[[32]byte]string)
+	e.output.optimized = make(map[string]bool)
+	for _, key := range slices.Sorted(maps.Keys(actual)) {
+		if refs.files[key] || files[resourceFile{key, "FontFile"}] && files[resourceFile{key, "MediaFile"}] {
+			continue
+		}
+		for _, role := range []string{"FontFile", "MediaFile"} {
+			if !files[resourceFile{key, role}] {
+				continue
+			}
+			if err := editorProgress(e.OnWriteProgress).report("compress", e.output.completed, 0); err != nil {
+				return err
+			}
+			data, err := read(actual[key])
+			if err != nil {
+				return err
+			}
+			if role == "MediaFile" {
+				options := e.output.options
+				if !e.output.images[key] {
+					options.Mode = CompressionLossless
+				}
+				candidate, err := pdfgo.OptimizeImageResource(e.output.ctx, data, options, e.output.sizes[key])
+				if err != nil {
+					if e.output.ctx.Err() != nil {
+						return e.output.ctx.Err()
+					}
+				} else if len(candidate) < len(data) {
+					data = candidate
+					parts[actual[key]] = data
+				}
+				if bytes.HasPrefix(data, []byte{255, 216}) {
+					formats[key] = "JPEG"
+					ext := path.Ext(actual[key])
+					if !strings.EqualFold(ext, ".jpg") && !strings.EqualFold(ext, ".jpeg") {
+						stem := strings.TrimSuffix(actual[key], ext)
+						name := stem + ".jpg"
+						for n := 1; reserved[strings.ToLower(name)]; n++ {
+							name = fmt.Sprintf("%s-%d.jpg", stem, n)
+						}
+						reserved[strings.ToLower(name)] = true
+						locations[key] = name
+						parts[name] = data
+						delete(parts, actual[key])
+						removed[key] = true
+						e.output.optimized[strings.ToLower(name)] = true
+					}
+				}
+				e.output.optimized[key] = true
+			}
+			if seen[role] == nil {
+				seen[role] = make(map[[32]byte]string)
+			}
+			hash := sha256.Sum256(data)
+			if first, ok := seen[role][hash]; ok {
+				aliases[key] = first
+				removed[key] = true
+				if locations[key] != actual[key] {
+					delete(parts, locations[key])
+				}
+			} else {
+				seen[role][hash] = key
+			}
+		}
+	}
+	for _, name := range resources {
+		data, err := read(name)
+		if err != nil {
+			return err
+		}
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return err
+		}
+		var patches []editorXMLPatch
+		for _, group := range root.children {
+			for _, node := range group.children {
+				for _, field := range []string{"FontFile", "MediaFile"} {
+					file := node.child(field)
+					if file == nil {
+						continue
+					}
+					var value string
+					if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
+						return err
+					}
+					key := editorResourceLocation(name, root.attr("BaseLoc"), value)
+					fragment := data[node.start:node.end]
+					location := locations[key]
+					if first, ok := aliases[key]; ok {
+						location = locations[first]
+					}
+					if location != "" && location != actual[key] {
+						var escaped bytes.Buffer
+						xml.EscapeText(&escaped, []byte("/"+location))
+						patch := editorXMLContent(data, file, escaped.Bytes())
+						patch.start -= node.start
+						patch.end -= node.start
+						fragment = editorPatchXML(fragment, []editorXMLPatch{patch})
+					}
+					if field == "MediaFile" && formats[key] != "" && node.attr("Format") != formats[key] {
+						parsed, err := parseEditorXML(fragment)
+						if err != nil {
+							return err
+						}
+						fragment, err = editorXMLAttribute(fragment, parsed, "Format", formats[key])
+						if err != nil {
+							return err
+						}
+					}
+					if !bytes.Equal(fragment, data[node.start:node.end]) {
+						patches = append(patches, editorXMLPatch{start: node.start, end: node.end, data: fragment})
+					}
+				}
+			}
+		}
+		if len(patches) > 0 {
+			parts[name] = editorPatchXML(data, patches)
+		}
+	}
+	return e.output.ctx.Err()
+}

ofdgo_editor_package.go

@@ -450,6 +450,12 @@ func (e *Editor) writeSource(writer io.Writer, fonts map[string][]byte, progress
 		return 0, err
 	}
 	reader := e.source.reader
+	if removed == nil {
+		removed = make(map[string]bool)
+	}
+	if err := e.compressResourceParts(parts, reader, removed); err != nil {
+		return 0, err
+	}
 	if len(parts) != 0 || len(removed) != 0 || e.output != nil && e.output.options.Mode != CompressionUnchanged && !e.output.protected {
 		name := "OFD.xml"
 		if file, ok := reader.packageFile(name); ok {

ofdgo_editor_resources.go

@@ -40,7 +40,10 @@ type editorResourceRefs struct {
 // 入参: parts 已修改和新增的包内条目, progress 保存进度回调
 // 返回: map[string]bool 可移除的二进制条目, error 读取错误
 func (e *Editor) compactSourceResources(parts map[string][]byte, progress editorProgress) (map[string]bool, error) {
-	if len(parts) == 0 && e.revision == 0 {
+	if e.output != nil && e.output.protected {
+		return nil, nil
+	}
+	if len(parts) == 0 && e.revision == 0 && (e.output == nil || e.output.options.Mode == CompressionUnchanged) {
 		return nil, nil
 	}
 	reader := e.source.reader

ofdgo_renderer_svg_canvas.go

@@ -89,13 +89,16 @@ func (s *svgResourceRenderer) RenderImage(img image.Image, m canvas.Matrix) {
 			resource.Data = buffer.Bytes()
 		}
 		if s.renderer != nil && s.renderer.Compression.Mode != CompressionUnchanged {
-			data, err := pdfgo.OptimizeImageSize(s.renderer.outputContext(), resource.Data, s.renderer.Compression, target)
+			data, err := pdfgo.OptimizeImageResource(s.renderer.outputContext(), resource.Data, s.renderer.Compression, target)
 			if err != nil {
 				if s.err = s.renderer.outputContext().Err(); s.err != nil {
 					return
 				}
 			} else {
 				resource.Data = data
+				if bytes.HasPrefix(data, []byte{255, 216}) {
+					resource.MIME = "image/jpeg"
+				}
 			}
 		}
 		if s.imageNames != nil {

ofdgo_sign_write.go

@@ -28,8 +28,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/xiaoqidun/pdfgo"
 )
 
 const (
@@ -256,25 +254,31 @@ func signatureWritePackage(parts map[string][]byte, options SignatureWriteOption
 		if err != nil {
 			return nil, err
 		}
-		seen := make(map[string]bool)
+		optimizer := &Editor{output: &outputOptimization{ctx: context.Background(), options: options.Compression, sizes: sizes, images: make(map[string]bool)}}
-		for i, img := range images {
+		optimizer.OnWriteProgress = func(stage string, completed, total int) error {
-			if err := options.progress.report("compress", i, len(images)); err != nil {
+			return options.progress.report(stage, completed, total)
-				return nil, err
+		}
-			}
+		for _, img := range images {
-			if seen[img.Location] {
+			key := strings.ToLower(cleanPackagePath(img.Location))
-				continue
+			optimizer.output.images[key] = !masks[key]
-			}
+		}
-			seen[img.Location] = true
+		removed := make(map[string]bool)
-			if data, ok := parts[img.Location]; ok {
+		if err := optimizer.compressResourceParts(parts, nil, removed); err != nil {
-				compression := options.Compression
+			return nil, err
-				if masks[strings.ToLower(cleanPackagePath(img.Location))] {
+		}
-					compression.Mode = CompressionLossless
+		for name := range parts {
-				}
+			if removed[strings.ToLower(cleanPackagePath(name))] {
-				if optimized, err := pdfgo.OptimizeImageSize(context.Background(), data, compression, sizes[strings.ToLower(cleanPackagePath(img.Location))]); err == nil {
+				delete(parts, name)
-					parts[img.Location] = optimized
-				}
 			}
 		}
+		r = &Reader{files: parts}
+		if err := r.initRoot(); err != nil {
+			return nil, err
+		}
+		doc, err = r.Doc()
+		if err != nil {
+			return nil, err
+		}
 	}
 	if options.Time.IsZero() {
 		options.Time = time.Now()

ofdgo_writer.go

@@ -169,6 +169,33 @@ func (e *Editor) writePlaintext(writer io.Writer) (int64, error) {
 	}
 	output := &ofdCountingWriter{writer: writer}
 	archive := zip.NewWriter(output)
+	if e.output != nil && e.output.options.Mode != CompressionUnchanged {
+		parts := make(map[string][]byte)
+		err := e.writeParts(func(name string, data []byte, _ bool) error {
+			if subset, ok := fonts[name]; ok {
+				data = subset
+			}
+			parts[name] = data
+			return nil
+		}, progress)
+		if err != nil {
+			return 0, err
+		}
+		removed := make(map[string]bool)
+		if err := e.compressResourceParts(parts, nil, removed); err != nil {
+			return 0, err
+		}
+		for _, name := range slices.Sorted(maps.Keys(parts)) {
+			if removed[strings.ToLower(cleanPackagePath(name))] {
+				continue
+			}
+			if err := e.writeOutputEntry(archive, zip.FileHeader{Name: name, Method: zip.Deflate}, parts[name]); err != nil {
+				return output.count, err
+			}
+		}
+		err = archive.Close()
+		return output.count, err
+	}
 	err = e.writeParts(func(name string, data []byte, compressed bool) error {
 		if subset, ok := fonts[name]; ok {
 			data = subset