feat(编辑能力): 新增擦除工具，优化字体裁剪与资源清理

assets/webui/index.html

@@ -91,6 +91,11 @@
 				</select>
 				<span>对象</span>
 			</div>
+			<div class="editor-group editor-erase">
+				<button id="eraseObjectButton" class="button" type="button" title="整对象擦除" aria-label="整对象擦除" aria-pressed="false">对象</button>
+				<button id="eraseRegionButton" class="button" type="button" title="区域擦除（视觉裁剪）" aria-label="区域擦除" aria-pressed="false">区域</button>
+				<span>擦除</span>
+			</div>
 			<div class="editor-group">
 				<button id="insertTextButton" class="button" type="button" aria-label="添加文字" aria-pressed="false">文字</button>
 				<button id="insertImageButton" class="button" type="button" aria-label="添加图片">图片</button>

assets/webui/ofdgo.css

@@ -119,7 +119,8 @@ a:focus-visible {
 	grid-template-columns: repeat(2, max-content);
 }
 
-.editor-transform {
+.editor-transform,
+.editor-erase {
 	grid-template-columns: max-content;
 }
 
@@ -1400,6 +1401,7 @@ button.outline-link:hover {
 
 .edit-object:hover,
 .edit-object.selected,
+.edit-object.erasing,
 .edit-selection,
 .edit-crop {
 	outline: calc(1px / var(--surface-scale)) solid var(--accent);
@@ -1419,6 +1421,11 @@ button.outline-link:hover {
 	background: rgba(15, 123, 104, 0.04);
 }
 
+.edit-object.erasing {
+	background: var(--accent-soft);
+	outline-style: dashed;
+}
+
 .edit-handle {
 	display: none;
 	position: absolute;

assets/webui/ofdgo.js

@@ -52,6 +52,7 @@ const state = {
 	searchIndex: -1,
 	navigationScroll: new Map(),
 	fontSyncPending: false,
+	fontCatalogLoading: false,
 	fontRenderPending: false,
 	fontSyncing: false,
 	doc: null,
@@ -117,6 +118,8 @@ const el = {
 	drawLineButton: document.querySelector("#drawLineButton"),
 	drawRectangleButton: document.querySelector("#drawRectangleButton"),
 	drawEllipseButton: document.querySelector("#drawEllipseButton"),
+	eraseObjectButton: document.querySelector("#eraseObjectButton"),
+	eraseRegionButton: document.querySelector("#eraseRegionButton"),
 	shapeFill: document.querySelector("#shapeFill"),
 	shapeFillColor: document.querySelector("#shapeFillColor"),
 	shapeStroke: document.querySelector("#shapeStroke"),
@@ -246,7 +249,7 @@ const fontManager = new FontManager({
 	onChange: scheduleFontSync,
 	onPermissionChange: updateFontPermissionHint,
 });
-const fontPicker = new FontPicker(el.textFont, el.textFontToggle, el.textFontList, changeTextFont);
+const fontPicker = new FontPicker(el.textFont, el.textFontToggle, el.textFontList, changeTextFont, loadEditorFonts);
 el.editorTools.addEventListener("scroll", () => fontPicker.position());
 
 const canvasEditor = new CanvasEditor(el.viewerPanel, {
@@ -274,6 +277,13 @@ const canvasEditor = new CanvasEditor(el.viewerPanel, {
 		if (state.fontRenderPending) window.setTimeout(refreshPendingFonts, 0);
 	},
 	onDelete: (item) => changeDocument(item.items ? "ofdgoDeleteObjects" : "ofdgoDeleteObject", item),
+	onErase: (items, box) => {
+		const blocked = items.find(item => !canEditObject(item, box ? "arrange" : "delete"));
+		if (blocked) { setStatus(objectEditReason(blocked) || "对象暂不可擦除"); return false; }
+		const item = { index: items[0].index, id: items.map(item => item.id) };
+		return box ? changeDocument("ofdgoEraseObjects", item, box.x, box.y, box.width, box.height)
+			: changeDocument("ofdgoDeleteObjects", item);
+	},
 	onEdit: editCanvasObject,
 	drawStyle: shapeStyle,
 	onTool: updateDrawingControls,
@@ -426,7 +436,8 @@ el.resetCropButton.addEventListener("click", () => {
 });
 editorClick(el.undoButton, () => changeDocument("ofdgoUndo"));
 editorClick(el.redoButton, () => changeDocument("ofdgoRedo"));
-for (const [button, tool] of [[el.drawLineButton, "line"], [el.drawRectangleButton, "rectangle"], [el.drawEllipseButton, "ellipse"]]) {
+for (const [button, tool] of [[el.drawLineButton, "line"], [el.drawRectangleButton, "rectangle"], [el.drawEllipseButton, "ellipse"],
+	[el.eraseObjectButton, "erase-object"], [el.eraseRegionButton, "erase-region"]]) {
 	editorClick(button, () => {
 		if (!state.editing || document.body.hasAttribute("aria-busy")) {
 			return;
@@ -987,6 +998,23 @@ function editorFonts(item) {
 	return fonts;
 }
 
+async function loadEditorFonts() {
+	if (!fontManager.canReadLocal() || fontManager.catalogLoaded || fontManager.permission === "denied" || state.fontCatalogLoading) return;
+	state.fontCatalogLoading = true;
+	try {
+		await fontManager.queryLocal();
+		const open = fontPicker.open;
+		const selected = state.textFonts[Number(fontPicker.value)];
+		const query = el.textFont.value === (selected?.fullName || selected?.name || "") ? "" : el.textFont.value;
+		updateTextFonts(canvasEditor.selected, true);
+		if (open && !el.textFont.disabled) { if (query) el.textFont.value = query; fontPicker.show(query); }
+	} catch (err) {
+		setStatus(err?.name === "NotAllowedError" ? "字体尚未授权" : String(err.message || err));
+	} finally {
+		state.fontCatalogLoading = false;
+	}
+}
+
 function updateTextFonts(item, refresh = false) {
 	const id = item?.type === "TextObject" && !item.draft ? item.font : null;
 	if (refresh || state.textFontID !== id) {
@@ -1193,6 +1221,10 @@ function updateDrawingControls() {
 		button.disabled = disabled || !pageCan("insert");
 		button.setAttribute("aria-pressed", String(tool === name));
 	}
+	for (const [button, name] of [[el.eraseObjectButton, "erase-object"], [el.eraseRegionButton, "erase-region"]]) {
+		button.disabled = disabled;
+		button.setAttribute("aria-pressed", String(tool === name));
+	}
 	el.selectObjectButton.setAttribute("aria-pressed", String(canvasEditor.enabled && !tool));
 	const styleDisabled = disabled || (canvasEditor.selected?.type === "PathObject"
 		? !canEditObject(canvasEditor.selected, "update") : !pageCan("insert"));
@@ -1224,7 +1256,7 @@ async function changeDocument(name, item, ...args) {
 			return true;
 		}
 		setEditorInfo(doc);
-		if (!item || name === "ofdgoDeleteObject" || name === "ofdgoDeleteObjects") {
+		if (!item || name === "ofdgoDeleteObject" || name === "ofdgoDeleteObjects" || name === "ofdgoEraseObjects") {
 			canvasEditor.clear();
 		}
 		if (name === "ofdgoCopyObjects" || name === "ofdgoPasteObjects" || name === "ofdgoInsertShape" || name === "ofdgoInsertText" || name === "ofdgoInsertImage") {

assets/webui/ofdgo_edit.js

@@ -358,7 +358,8 @@ export class CanvasEditor {
 			return;
 		}
 		if (this.tool) {
-			this.startShape(event);
+			if (this.tool.startsWith("erase-")) this.startErase(event);
+			else this.startShape(event);
 			return;
 		}
 		if (event.altKey && !event.shiftKey && !event.ctrlKey && !event.metaKey && !event.target.dataset.corner) {
@@ -425,6 +426,10 @@ export class CanvasEditor {
 		}
 		event.preventDefault();
 		drag.pointer = event;
+		if (drag.erase) {
+			this.moveErase(event, drag);
+			return;
+		}
 		if (drag.crop) {
 			const from = pagePoint(drag.clientX, drag.clientY, drag.rect, drag.page, drag.rotation);
 			const to = pagePoint(event.clientX, event.clientY, drag.rect, drag.page, drag.rotation);
@@ -495,6 +500,14 @@ export class CanvasEditor {
 			return;
 		}
 		this.move(event);
+		if (drag.erase) {
+			const items = drag.erase === "erase-object" ? [...drag.erased] : drag.box
+				? drag.items.filter(item => item.x < drag.box.x + drag.box.width && item.x + item.width > drag.box.x
+					&& item.y < drag.box.y + drag.box.height && item.y + item.height > drag.box.y) : [];
+			this.cancel();
+			if (items.length) this.options.onErase(items, drag.erase === "erase-region" ? drag.box : null);
+			return;
+		}
 		if (drag.crop) {
 			this.drag = null;
 			this.viewer.releasePointerCapture(drag.pointerID);
@@ -550,6 +563,7 @@ export class CanvasEditor {
 		const drag = this.drag;
 		this.drag = null;
 		if (drag) {
+			for (const item of drag.erased || []) item.node.classList.remove("erasing");
 			if (drag.crop) {
 				this.crop.box = drag.box;
 				this.paintCrop();
@@ -566,6 +580,29 @@ export class CanvasEditor {
 		}
 	}
 
+	startErase(event) {
+		const surface = event.target.closest(".page-surface") || this.nearestSurface(event);
+		const page = this.pages.get(surface);
+		if (!page) return;
+		event.preventDefault();
+		this.viewer.focus({ preventScroll: true });
+		this.drag = { erase: this.tool, page, surface, items: [...surface.querySelectorAll(".edit-object")].map(node => this.nodes.get(node)),
+			erased: new Set(), shape: "rectangle", pointerID: event.pointerId, clientX: event.clientX, clientY: event.clientY,
+			rect: surface.getBoundingClientRect(), rotation: this.options.rotation() };
+		if (this.tool === "erase-region") Object.assign(this.drag, this.createPreview(surface, page, "rectangle",
+			{ fill: true, fillColor: "var(--accent-soft)", stroke: true, strokeColor: "var(--accent)", lineWidth: 0.2 }));
+		this.viewer.setPointerCapture(event.pointerId);
+		this.moveErase(event, this.drag);
+	}
+
+	moveErase(event, drag) {
+		if (drag.erase === "erase-region") { this.moveShape(event, drag); return; }
+		const point = pagePoint(event.clientX, event.clientY, drag.rect, drag.page, drag.rotation);
+		const item = [...drag.items].reverse().find(item => point.x >= item.x && point.x <= item.x + item.width
+			&& point.y >= item.y && point.y <= item.y + item.height);
+		if (item) { drag.erased.add(item); item.node.classList.add("erasing"); }
+	}
+
 	startMarquee(event, additive) {
 		const surface = event.target.closest(".page-surface"), page = this.pages.get(surface);
 		if (!page) {

assets/webui/ofdgo_font.js

@@ -1,8 +1,8 @@
 const DATABASE = "ofdgo";
 
 export class FontPicker {
-	constructor(input, toggle, list, onChange) {
-		Object.assign(this, { input, toggle, list, onChange, fonts: [], value: "", active: -1, open: false });
+	constructor(input, toggle, list, onChange, onOpen) {
+		Object.assign(this, { input, toggle, list, onChange, onOpen, fonts: [], 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(); });
@@ -73,6 +73,7 @@ export class FontPicker {
 		this.position();
 		const selected = this.matches.findIndex(({ font, index }) => !font.disabled && String(index) === this.value);
 		this.activate(selected < 0 ? this.matches.findIndex(({ font }) => !font.disabled) : selected);
+		this.onOpen?.();
 	}
 
 	position() {

internal/webui/wasm.go

@@ -114,6 +114,7 @@ func RunWASM() {
 	registerCallback("ofdgoTransformObjects", transformObjects)
 	registerCallback("ofdgoAlignObjects", alignObjects)
 	registerCallback("ofdgoDeleteObjects", deleteObjects)
+	registerCallback("ofdgoEraseObjects", eraseObjects)
 	registerCallback("ofdgoCopyObjects", copyObjects)
 	registerCallback("ofdgoCaptureObjects", captureObjects)
 	registerCallback("ofdgoPasteObjects", pasteObjects)
@@ -1399,6 +1400,17 @@ func deleteObjects(args []js.Value) (any, error) {
 	})
 }
 
+// eraseObjects 按页面矩形范围擦除对象，保留局部裁剪之外的内容。
+// 入参: args 页面索引、对象标识数组和毫米坐标范围
+// 返回: any 文档信息, error 错误信息
+func eraseObjects(args []js.Value) (any, error) {
+	return changeObjects(func() error {
+		return currentEditor.EraseObjects(args[0].Int(), stringsFromJS(args[1]), ofdgo.Box{
+			X: args[2].Float(), Y: args[3].Float(), W: args[4].Float(), H: args[5].Float(),
+		})
+	})
+}
+
 // changeObjects 提交库层批量操作，无修改时复用当前预览。
 // 入参: apply 待执行的编辑操作
 // 返回: any 文档信息, error 错误信息

ofdgo_editor.go

@@ -30,6 +30,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/tdewolff/font"
+	"github.com/xiaoqidun/jbig2"
 )
 
 // 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
@@ -346,7 +347,8 @@ func editorFontName(sfnt *font.SFNT, names ...font.NameID) string {
 	return ""
 }
 
-// AddImage 注册PNG或JPEG图片，保留原始编码，重复资源复用标识，引用后写入文档
+// AddImage 注册PNG或JPEG图片，重复资源复用标识，引用后写入文档
+// 不透明纯黑白PNG仅在无损JBIG2编码更小时转换，其他图片保留原始编码。
 // 入参: data 图片数据
 // 返回: string 图片资源标识, error 错误信息
 func (e *Editor) AddImage(data []byte) (string, error) {
@@ -364,10 +366,17 @@ func (e *Editor) AddImage(data []byte) (string, error) {
 	if err := e.prepareSourceIDs(); err != nil {
 		return "", err
 	}
+	if format == "png" && uint64(config.Width)*uint64(config.Height) <= 64<<20 {
+		if compact := editorBinaryImage(data); compact != nil {
+			data, format = compact, "jbig2"
+		}
+	}
 	id := e.nextID()
 	extension := format
 	if extension == "jpeg" {
 		extension = "jpg"
+	} else if extension == "jbig2" {
+		extension = "jb2"
 	}
 	name := "Image_" + id + "." + extension
 	e.resources = append(e.resources, editorResource{
@@ -380,8 +389,23 @@ func (e *Editor) AddImage(data []byte) (string, error) {
 	return id, nil
 }
 
+// editorBinaryImage 尝试纯黑白无损编码，不二值化，不改变透明度，无体积收益时保留原图。
+// 入参: data PNG图片数据
+// 返回: []byte 更小的JBIG2数据，不适用时为nil
+func editorBinaryImage(data []byte) []byte {
+	img, _, err := image.Decode(bytes.NewReader(data))
+	if err != nil {
+		return nil
+	}
+	var output bytes.Buffer
+	if err := jbig2.Encode(&output, img, &jbig2.Options{MaxPageBytes: uint64(len(data))}); err != nil || output.Len() >= len(data) {
+		return nil
+	}
+	return output.Bytes()
+}
+
 // AddObject 按添加顺序放入正文图层，支持文字、路径和图片，自动分配对象ID
-// 支持基本颜色、直接资源引用及图片的路径裁剪，不支持动作、渐变及复合图元
+// 支持基本颜色、直接资源引用及路径裁剪，不支持动作、渐变及复合图元
 // 入参: page 页面索引, object 对象内容，添加后不再引用调用方的可变数据
 // 返回: string 对象标识, error 错误信息
 func (e *Editor) AddObject(page int, object GraphicObject) (string, error) {
@@ -579,10 +603,10 @@ func (e *Editor) prepareObject(id string, object GraphicObject) (GraphicObject,
 	} else if object.Type == "ImageObject" {
 		object.ImageObject.CTM = fmt.Sprintf("%s 0 0 %s 0 0", ofdNumber(box.W), ofdNumber(box.H))
 	}
-	if drawParam != "" || len(actions) != 0 || clips != nil && object.Type != "ImageObject" {
-		return GraphicObject{}, fmt.Errorf("draw parameter references, non-image clips and actions are not supported for creation")
+	if drawParam != "" || len(actions) != 0 {
+		return GraphicObject{}, fmt.Errorf("draw parameter references and actions are not supported for creation")
 	}
-	if err := e.validateImageClips(clips); err != nil {
+	if err := e.validateObjectClips(clips); err != nil {
 		return GraphicObject{}, err
 	}
 	if alpha != nil && (*alpha < 0 || *alpha > 255) {
@@ -599,23 +623,23 @@ func (e *Editor) prepareObject(id string, object GraphicObject) (GraphicObject,
 	return cloneEditorObject(object)
 }
 
-// validateImageClips 校验图片的路径裁剪，仅接受无资源引用及嵌套裁剪的路径
-// 入参: clips 图片裁剪集合，nil表示无裁剪
+// validateObjectClips 校验对象的路径裁剪，仅接受无资源引用及嵌套裁剪的路径
+// 入参: clips 裁剪集合，nil表示无裁剪
 // 返回: error 错误信息
-func (e *Editor) validateImageClips(clips *Clips) error {
+func (e *Editor) validateObjectClips(clips *Clips) error {
 	if clips == nil {
 		return nil
 	}
 	if len(clips.Clip) == 0 {
-		return fmt.Errorf("image clips must contain a clip")
+		return fmt.Errorf("clips must contain a clip")
 	}
 	for _, clip := range clips.Clip {
 		if len(clip.Area) == 0 {
-			return fmt.Errorf("image clip must contain an area")
+			return fmt.Errorf("clip must contain an area")
 		}
 		for _, area := range clip.Area {
 			if len(area.Path) == 0 || area.DrawParam != "" || len(area.Text) != 0 {
-				return fmt.Errorf("image clips only support paths without draw parameter references")
+				return fmt.Errorf("clips only support paths without draw parameter references")
 			}
 			if area.CTM != "" {
 				if _, err := creationNumbers(area.CTM, 6); err != nil {
@@ -623,8 +647,8 @@ func (e *Editor) validateImageClips(clips *Clips) error {
 				}
 			}
 			for _, path := range area.Path {
-				if path.ID != "" {
-					return fmt.Errorf("clip paths must not have object IDs")
+				if path.ID != "" || path.Clips != nil {
+					return fmt.Errorf("clip paths must not have object IDs or nested clips")
 				}
 				if _, err := e.prepareObject("", GraphicObject{Type: "PathObject", PathObject: path}); err != nil {
 					return err
@@ -726,12 +750,12 @@ func transformEditorObject(object GraphicObject, dx, dy, scale float64) (Graphic
 		boundary, ctm = &object.PathObject.Boundary, &object.PathObject.CTM
 	case "ImageObject":
 		boundary, ctm = &object.ImageObject.Boundary, &object.ImageObject.CTM
-		if scale != 1 {
-			object.ImageObject.Clips = transformImageClips(object.ImageObject.Clips, Matrix{a: scale, d: scale})
-		}
 	default:
 		return GraphicObject{}, fmt.Errorf("unsupported object type %q", object.Type)
 	}
+	if clips := editorObjectClips(&object); scale != 1 && *clips != nil && (object.Type == "TextObject" || (*clips).TransFlag != nil && !*(*clips).TransFlag) {
+		*clips = transformObjectClips(*clips, Matrix{a: scale, d: scale})
+	}
 	box, err := ParseBox(*boundary)
 	if err != nil {
 		return GraphicObject{}, err

ofdgo_editor_erase.go

@@ -0,0 +1,136 @@
+// 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 (
+	"fmt"
+	"math"
+	"reflect"
+	"slices"
+)
+
+// EraseObjects 擦除同页对象与矩形区域重叠的可见部分，一次撤销恢复全部。
+// 全部覆盖时删除对象；局部覆盖使用OFD路径裁剪，保留原文字和资源，不用于敏感信息脱敏。
+// 不改变未相交对象，无法保真编辑时返回错误且不提交修改。
+// 入参: page 页面索引, ids 对象标识, box 页面毫米坐标中的擦除范围
+// 返回: error 错误信息
+func (e *Editor) EraseObjects(page int, ids []string, box Box) error {
+	if _, err := creationBox(editorBoxString(box)); err != nil {
+		return err
+	}
+	objects, indexes, err := e.selectedObjects(page, ids)
+	if err != nil || len(objects) == 0 {
+		return err
+	}
+	boxes, err := e.objectBounds(page, objects)
+	if err != nil {
+		return err
+	}
+	layers := copyEditorPage(e.pages[page]).Content.Layer
+	removed := make(map[string]bool)
+	changed := false
+	for i, object := range objects {
+		bounds := boxes[i]
+		x, y := math.Max(box.X, bounds.X), math.Max(box.Y, bounds.Y)
+		right, bottom := math.Min(box.X+box.W, bounds.X+bounds.W), math.Min(box.Y+box.H, bounds.Y+bounds.H)
+		if right <= x || bottom <= y {
+			continue
+		}
+		if x == bounds.X && y == bounds.Y && right == bounds.X+bounds.W && bottom == bounds.Y+bounds.H {
+			removed[ids[i]] = true
+			changed = true
+			continue
+		}
+		object, err := cloneEditorObject(object)
+		if err != nil {
+			return err
+		}
+		boundary, ctm := editorGeometry(object)
+		frame, _ := ParseBox(boundary)
+		outer := unionTextBox(bounds, frame)
+		outer.X, outer.Y, outer.W, outer.H = outer.X-1, outer.Y-1, outer.W+2, outer.H+2
+		x, y = math.Max(box.X, outer.X), math.Max(box.Y, outer.Y)
+		right, bottom = math.Min(box.X+box.W, outer.X+outer.W), math.Min(box.Y+box.H, outer.Y+outer.H)
+		clips := editorObjectClips(&object)
+		if *clips == nil {
+			*clips = &Clips{}
+		}
+		matrix := IdentityMatrix
+		if (*clips).TransFlag == nil || *(*clips).TransFlag {
+			if object.Type == "ImageObject" && ctm == "" {
+				ctm = Matrix{a: frame.W, d: frame.H}.String()
+			}
+			var ok bool
+			matrix, ok = NewMatrix(ctm).Invert()
+			if !ok {
+				return fmt.Errorf("object %q transform is not invertible", ids[i])
+			}
+		}
+		clip := Clip{}
+		for _, area := range []Box{
+			{X: outer.X, Y: outer.Y, W: outer.W, H: y - outer.Y},
+			{X: outer.X, Y: bottom, W: outer.W, H: outer.Y + outer.H - bottom},
+			{X: outer.X, Y: y, W: x - outer.X, H: bottom - y},
+			{X: right, Y: y, W: outer.X + outer.W - right, H: bottom - y},
+		} {
+			if area.W <= 0 || area.H <= 0 {
+				continue
+			}
+			area.X, area.Y = area.X-frame.X, area.Y-frame.Y
+			path, err := NewShape(ShapeRectangle, area)
+			if err != nil {
+				return err
+			}
+			fill, stroke := true, false
+			path.Fill, path.Stroke = &fill, &stroke
+			clip.Area = append(clip.Area, ClipArea{CTM: matrix.String(), Path: []PathObject{path}})
+		}
+		if slices.ContainsFunc((*clips).Clip, func(previous Clip) bool { return reflect.DeepEqual(previous, clip) }) {
+			continue
+		}
+		(*clips).Clip = append((*clips).Clip, clip)
+		changed = true
+		position := indexes[i]
+		layers[position.layer].Objects[position.index] = object
+	}
+	if changed {
+		for i := range layers {
+			objects := layers[i].Objects[:0]
+			for _, object := range layers[i].Objects {
+				if !removed[editorObjectID(object)] {
+					objects = append(objects, object)
+				}
+			}
+			layers[i].Objects = objects
+		}
+		e.replaceLayers(page, layers)
+	}
+	return nil
+}
+
+// editorObjectClips 获取基本对象的裁剪字段。
+// 入参: object 文字、路径或图片对象
+// 返回: **Clips 裁剪字段地址，不支持的对象返回nil
+func editorObjectClips(object *GraphicObject) **Clips {
+	switch object.Type {
+	case "TextObject":
+		return &object.TextObject.Clips
+	case "PathObject":
+		return &object.PathObject.Clips
+	case "ImageObject":
+		return &object.ImageObject.Clips
+	}
+	return nil
+}

ofdgo_editor_package.go

@@ -382,12 +382,21 @@ func (e *Editor) writeSource(writer io.Writer, fonts map[string][]byte) (int64,
 		return 0, err
 	}
 	maps.Copy(parts, fonts)
+	removed, err := e.pruneSourceResources(parts)
+	if err != nil {
+		return 0, err
+	}
 	reader := e.source.reader
 	remaining := maps.Clone(reader.files)
 	if remaining == nil {
 		remaining = make(map[string][]byte)
 	}
 	maps.Copy(remaining, parts)
+	for name := range remaining {
+		if removed[strings.ToLower(cleanPackagePath(name))] {
+			delete(remaining, name)
+		}
+	}
 	output := &ofdCountingWriter{writer: writer}
 	archive := zip.NewWriter(output)
 	if reader.Zip != nil {
@@ -401,6 +410,9 @@ func (e *Editor) writeSource(writer io.Writer, fonts map[string][]byte) (int64,
 				continue
 			}
 			name := cleanPackagePath(file.Name)
+			if removed[strings.ToLower(name)] {
+				continue
+			}
 			if data, ok := remaining[name]; ok {
 				header := file.FileHeader
 				entry, err := archive.CreateHeader(&header)

ofdgo_editor_resources.go

@@ -0,0 +1,281 @@
+// 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 (
+	"bufio"
+	"bytes"
+	"encoding/xml"
+	"io"
+	"maps"
+	"path"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// editorResourceRefs 保存全包资源标识和直接文件引用，不以页面是否加载判断资源存活。
+type editorResourceRefs struct {
+	ids   map[string]bool
+	files map[string]bool
+}
+
+// pruneSourceResources 在保存副本中清理无引用字体和图片，保留其他资源及原始编辑状态。
+// 按GB/T 33190-2016附录A检查标识和路径引用，包括模板、注释、底纹、裁剪、版本和其他文档。
+// 全包检查保留孤立XML中的引用；未知命名空间、扩展数据或无法解析的XML使本次清理跳过。
+// 入参: parts 已修改和新增的包内条目
+// 返回: map[string]bool 可移除的二进制条目, error 读取错误
+func (e *Editor) pruneSourceResources(parts map[string][]byte) (map[string]bool, error) {
+	if len(parts) == 0 {
+		return nil, nil
+	}
+	reader := e.source.reader
+	names := make(map[string]bool)
+	for name := range reader.fileIndex {
+		names[name] = true
+	}
+	for name := range reader.files {
+		names[name] = true
+	}
+	for name := range parts {
+		names[name] = true
+	}
+	refs := editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool)}
+	var resources []string
+	for _, name := range slices.Sorted(maps.Keys(names)) {
+		if strings.HasSuffix(name, "/") {
+			continue
+		}
+		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 nil, err
+			}
+		}
+		resource, safe := refs.scan(input, name)
+		input.Close()
+		if !safe {
+			return nil, nil
+		}
+		if resource {
+			resources = append(resources, name)
+		}
+	}
+	removed := make(map[string]bool)
+	usedFiles := maps.Clone(refs.files)
+	updates := make(map[string][]byte)
+	for _, name := range resources {
+		data, ok := parts[name]
+		if !ok {
+			var err error
+			data, err = reader.readFile(name)
+			if err != nil {
+				return nil, err
+			}
+		}
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return nil, nil
+		}
+		var patches []editorXMLPatch
+		for _, group := range root.children {
+			var members []editorXMLPatch
+			for _, node := range group.children {
+				field := ""
+				if group.name.Local == "Fonts" && node.name.Local == "Font" {
+					field = "FontFile"
+				} else if group.name.Local == "MultiMedias" && node.name.Local == "MultiMedia" {
+					field = "MediaFile"
+				}
+				if field == "" {
+					continue
+				}
+				id := editorResourceID(node.attr("ID"))
+				keep := id == "" || refs.ids[id] || field == "MediaFile" && node.attr("Type") != "Image"
+				if file := node.child(field); file != nil {
+					var value string
+					if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
+						return nil, nil
+					}
+					if location := editorResourceLocation(name, root.attr("BaseLoc"), value); location != "" {
+						if keep {
+							usedFiles[location] = true
+							usedFiles[strings.ToLower(cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value)))] = true
+						} else {
+							removed[location] = true
+						}
+					}
+				}
+				if !keep {
+					members = append(members, editorXMLPatch{start: node.start, end: node.end})
+				}
+			}
+			if len(members) > 0 && len(members) == len(group.children) {
+				patches = append(patches, editorXMLPatch{start: group.start, end: group.end})
+			} else {
+				patches = append(patches, members...)
+			}
+		}
+		if len(patches) != 0 {
+			updates[name] = editorPatchXML(data, patches)
+		}
+	}
+	for name := range usedFiles {
+		delete(removed, name)
+	}
+	maps.Copy(parts, updates)
+	for name := range parts {
+		if removed[strings.ToLower(cleanPackagePath(name))] {
+			delete(parts, name)
+		}
+	}
+	return removed, nil
+}
+
+// scan 流式读取包内XML引用，二进制条目只探测文件头，不展开页面对象或图片像素。
+// 入参: input 文件流, name 包内路径
+// 返回: bool 是否资源索引, bool 是否可完整判断引用
+func (r *editorResourceRefs) scan(input io.Reader, name string) (bool, bool) {
+	buffer := bufio.NewReader(input)
+	header, err := buffer.Peek(512)
+	if err != nil && err != io.EOF {
+		return false, false
+	}
+	header = bytes.TrimSpace(bytes.TrimPrefix(header, []byte{0xef, 0xbb, 0xbf}))
+	if len(header) == 0 {
+		return false, err == io.EOF && !strings.EqualFold(path.Ext(name), ".xml")
+	}
+	if header[0] != '<' {
+		return false, !strings.EqualFold(path.Ext(name), ".xml")
+	}
+	decoder := xml.NewDecoder(buffer)
+	var stack []string
+	var text strings.Builder
+	resource, base := false, ""
+	for {
+		token, err := decoder.Token()
+		if err == io.EOF {
+			return resource, len(stack) == 0
+		}
+		if err != nil {
+			return false, false
+		}
+		switch token := token.(type) {
+		case xml.StartElement:
+			if token.Name.Space != "" && token.Name.Space != ofdNamespace {
+				return false, false
+			}
+			if token.Name.Local == "CustomTags" || token.Name.Local == "Extensions" || token.Name.Local == "ExtendData" || token.Name.Local == "Data" {
+				return false, false
+			}
+			if len(stack) == 0 {
+				resource = token.Name.Local == "Res"
+				if resource {
+					for _, attr := range token.Attr {
+						if attr.Name.Local == "BaseLoc" {
+							base = attr.Value
+						}
+					}
+				}
+			}
+			for _, attr := range token.Attr {
+				if attr.Name.Space == "xmlns" || attr.Name.Local == "xmlns" || attr.Name.Space == "http://www.w3.org/XML/1998/namespace" {
+					continue
+				}
+				if attr.Name.Space != "" {
+					return false, false
+				}
+				if attr.Name.Local != "ID" {
+					r.reference(name, base, attr.Name.Local, attr.Value, resource)
+				}
+			}
+			stack = append(stack, token.Name.Local)
+			text.Reset()
+		case xml.CharData:
+			text.Write(token)
+		case xml.EndElement:
+			r.reference(name, base, token.Name.Local, text.String(), resource)
+			stack = stack[:len(stack)-1]
+			text.Reset()
+		case xml.Directive:
+			return false, false
+		}
+	}
+}
+
+// reference 记录标准资源标识和路径引用，不将普通数字或资源自身ID视为引用。
+// 入参: name 当前文件, base 资源目录, key 字段, value 值, resource 是否资源索引
+func (r *editorResourceRefs) reference(name, base, key, value string, resource bool) {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return
+	}
+	switch key {
+	case "Font", "ResourceID", "Substitution", "ImageMask", "Relative", "DrawParam", "ColorSpace", "DefaultCS", "Thumbnail", "TemplateID", "PageID", "PageRef", "RefId":
+		if id := editorResourceID(value); id != "" {
+			r.ids[id] = true
+		}
+		return
+	case "DocRoot", "Signatures", "Cover", "PublicRes", "DocumentRes", "PageRes", "Annotations", "Attachments", "FileLoc", "FileRef", "Profile", "SignedValue", "SchemaLoc", "ExtendData", "File":
+	case "BaseLoc":
+		if resource {
+			return
+		}
+	case "FontFile", "MediaFile":
+		if resource {
+			return
+		}
+	default:
+		return
+	}
+	r.files[editorResourceLocation(name, base, value)] = true
+	r.files[strings.ToLower(cleanPackagePath(resolveResourcePath(name, base, value)))] = true
+}
+
+// editorResourceID 规范化ST_ID与ST_RefID的十进制表示。
+// 入参: value 标识文本
+// 返回: string 标准十进制标识，无效时为空
+func editorResourceID(value string) string {
+	id, err := strconv.ParseUint(strings.TrimSpace(value), 10, 32)
+	if err != nil || id == 0 {
+		return ""
+	}
+	return strconv.FormatUint(id, 10)
+}
+
+// editorResourceLocation 按ST_Loc与Res.BaseLoc解析路径，大小写折叠用于保守保留共享文件。
+// 入参: name 所在XML, base 资源目录, value 路径值
+// 返回: string 包内路径
+func editorResourceLocation(name, base, value string) string {
+	value = strings.ReplaceAll(strings.TrimSpace(value), "\\", "/")
+	if value == "" {
+		return ""
+	}
+	if strings.HasPrefix(value, "/") {
+		return strings.ToLower(cleanPackagePath(value))
+	}
+	base = strings.ReplaceAll(base, "\\", "/")
+	dir := path.Dir(name)
+	if strings.HasPrefix(base, "/") {
+		dir = cleanPackagePath(base)
+	} else {
+		dir = path.Join(dir, base)
+	}
+	return strings.ToLower(cleanPackagePath(path.Join(dir, value)))
+}

ofdgo_editor_transform.go

@@ -102,21 +102,18 @@ func (e *Editor) orientObjects(page int, ids []string, matrix Matrix) error {
 		local := TranslationMatrix(-after.X, -after.Y).Multiply(matrix).Multiply(TranslationMatrix(before.X, before.Y))
 		*ctm = local.Multiply(NewMatrix(*ctm)).String()
 		*boundary = editorBoxString(after)
-		if object.Type == "ImageObject" {
-			object.ImageObject.Clips = transformImageClips(object.ImageObject.Clips, local)
+		if clips := editorObjectClips(&object); *clips != nil && (*clips).TransFlag != nil && !*(*clips).TransFlag {
+			*clips = transformObjectClips(*clips, local)
 		}
 		objects[i] = object
 	}
 	return e.updateObjects(page, objects, true)
 }
 
-// transformImageClips 同步变换不随对象CTM变化的裁剪区域，不修改原始裁剪数据。
-// 入参: clips 图片裁剪集合, matrix 对象边界坐标中的变换
+// transformObjectClips 变换裁剪区域，不修改原始裁剪数据。
+// 入参: clips 裁剪集合, matrix 对象边界坐标中的变换
 // 返回: *Clips 变换后的裁剪集合
-func transformImageClips(clips *Clips, matrix Matrix) *Clips {
-	if clips == nil || clips.TransFlag == nil || *clips.TransFlag {
-		return clips
-	}
+func transformObjectClips(clips *Clips, matrix Matrix) *Clips {
 	result := *clips
 	result.Clip = slices.Clone(clips.Clip)
 	for i := range result.Clip {

ofdgo_editor_xml.go

@@ -232,11 +232,12 @@ func editorXMLSupported(node *editorXML) bool {
 	var allowed, children string
 	switch node.name.Local {
 	case "TextObject":
-		allowed, children = "ID Boundary CTM DrawParam Font Size HScale Weight ReadDirection CharDirection LineWidth MiterLimit Join Italic Visible Stroke Fill Alpha", "FillColor StrokeColor TextCode"
+		allowed, children = "ID Boundary CTM DrawParam Font Size HScale Weight ReadDirection CharDirection LineWidth MiterLimit Join Italic Visible Stroke Fill Alpha", "Clips FillColor StrokeColor TextCode"
 	case "PathObject", "Path":
 		allowed, children = "Boundary CTM LineWidth MiterLimit Join Cap Rule DashPattern DashOffset Visible Stroke Fill Alpha", "StrokeColor FillColor AbbreviatedData"
 		if node.name.Local == "PathObject" {
 			allowed += " ID DrawParam"
+			children += " Clips"
 		}
 	case "ImageObject":
 		allowed, children = "ID Boundary CTM ResourceID ImageMask Visible Alpha", "Clips"

ofdgo_renderer_image.go

@@ -20,6 +20,7 @@ import (
 	"image"
 	"image/color"
 	"io"
+	"math"
 
 	"github.com/tdewolff/canvas"
 	canvasimage "github.com/tdewolff/canvas/image"
@@ -79,7 +80,8 @@ func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float
 		}
 	}
 	clipPath := intersectClipPath(parentClip, r.buildObjectClipPath(obj.Clips, pageH, box.X, box.Y, localCTM, parentCTM, boundaryInCTM))
-	img = imageWithClip(img, clipPath, m)
+	img = imageWithClip(img, clipPath, m, 96)
+	m = m.Scale(imgW/float64(img.Bounds().Dx()), imgH/float64(img.Bounds().Dy()))
 	img, pad := imageWithTransparentEdge(img)
 	if pad > 0 {
 		p := float64(pad)
@@ -169,9 +171,10 @@ func imageWithMask(img, mask image.Image) image.Image {
 }
 
 // imageWithClip 应用图片裁剪区域
-// 入参: img 图片对象, clipPath 裁剪路径, m 图片变换矩阵
+// 低分辨率图片按最低精度细化蒙版，细化后的像素上限16Mi，不降低原图分辨率。
+// 入参: img 图片对象, clipPath 裁剪路径, m 图片变换矩阵, dpi 最低蒙版分辨率，0保留原图精度
 // 返回: image.Image 裁剪后的图片对象
-func imageWithClip(img image.Image, clipPath *canvas.Path, m canvas.Matrix) image.Image {
+func imageWithClip(img image.Image, clipPath *canvas.Path, m canvas.Matrix, dpi float64) image.Image {
 	if img == nil || clipPath == nil || m.Det() == 0 {
 		return img
 	}
@@ -197,6 +200,16 @@ func imageWithClip(img image.Image, clipPath *canvas.Path, m canvas.Matrix) imag
 	} else if clipPath.Contains(imagePath) {
 		return img
 	}
+	scale := math.Max(math.Hypot(m[0][0], m[1][0]), math.Hypot(m[0][1], m[1][1])) * dpi / 25.4
+	scale = math.Min(scale, math.Sqrt((16<<20)/(float64(w)*float64(h))))
+	if scale > 1 {
+		nw, nh := int(float64(w)*scale), int(float64(h)*scale)
+		resized := image.NewNRGBA(image.Rect(0, 0, nw, nh))
+		draw.CatmullRom.Scale(resized, resized.Bounds(), imagePixelSource(img), bounds, draw.Src, nil)
+		img = resized
+		m = m.Scale(float64(w)/float64(nw), float64(h)/float64(nh))
+		bounds, w, h = resized.Bounds(), nw, nh
+	}
 	clip := clipPath.Copy().Transform(m.Inv())
 	clipCanvas := canvas.New(float64(w), float64(h))
 	ctx := canvas.NewContext(clipCanvas)

ofdgo_writer.go

@@ -530,10 +530,12 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 	if object.Type == "ImageObject" {
 		x.clips(object.ImageObject.Clips)
 	} else if object.Type == "PathObject" || object.Type == "Path" {
+		x.clips(object.PathObject.Clips)
 		x.color("StrokeColor", stroke)
 		x.color("FillColor", fill)
 		x.text("AbbreviatedData", object.PathObject.AbbreviatedData)
 	} else if object.Type == "TextObject" {
+		x.clips(object.TextObject.Clips)
 		x.color("FillColor", fill)
 		x.color("StrokeColor", stroke)
 		for _, code := range object.TextObject.TextCode {
@@ -548,7 +550,7 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 	x.end(object.Type)
 }
 
-// clips 写出图片路径裁剪，保留裁剪集合、区域及路径的变换
+// clips 写出对象路径裁剪，保留裁剪集合、区域及路径的变换
 // 入参: clips 裁剪集合，nil不输出节点
 func (x *ofdXML) clips(clips *Clips) {
 	if clips == nil {