feat(剪裁编辑): 规范裁剪编辑，优化资源扫描

ofdgo_editor.go

@@ -1035,7 +1035,7 @@ func transformEditorObject(object GraphicObject, dx, dy, scale float64) (Graphic
 	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) {
+	if clips := editorObjectClips(&object); scale != 1 && *clips != nil && (object.Type == "TextObject" || !(*clips).usesObjectMatrix()) {
 		*clips = transformObjectClips(*clips, Matrix{a: scale, d: scale})
 	}
 	box, err := ParseBox(*boundary)

ofdgo_editor_composite.go

@@ -470,10 +470,8 @@ func (e *Editor) compositeMembers(n *editorCompositeNode, reader *Reader, render
 		boundary := n.parent.Multiply(TranslationMatrix(box.X, box.Y))
 		matrix := boundary.Multiply(NewMatrix(c.CTM))
 		clips, clipMatrix := c.Clips, matrix
-		if clips != nil && clips.TransFlag != nil && !*clips.TransFlag {
+		if !clips.usesObjectMatrix() {
-			copy := *clips
+			clipMatrix = boundary
-			copy.TransFlag = nil
-			clips, clipMatrix = &copy, boundary
 		}
 		clip := n.clip
 		var err error
@@ -658,7 +656,7 @@ func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorComp
 		}
 		if transform && node.object.Type == "ImageObject" && bounds.Bounds.W > 0 && bounds.Bounds.H > 0 {
 			clips := node.object.ImageObject.Clips
-			_, capability.CropImage = node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+			_, capability.CropImage = node.matrix(clips.usesObjectMatrix()).Invert()
 			capability.FitImage = capability.CropImage && axisAlignedMatrix(NewMatrix(node.object.ImageObject.CTM))
 			capability.ResetCrop = node.states[editorObjectID(node.object)].crop != nil
 		}
@@ -903,7 +901,7 @@ func transformCompositeOffsets(data []byte, matrix Matrix) ([]byte, error) {
 				}
 				object := cloneEditorData(n.object)
 				object = compositeBoundary(object, Matrix{a: matrix.a, b: matrix.b, c: matrix.c, d: matrix.d}, false)
-				if clips := editorObjectClips(&object); *clips != nil && (*clips).TransFlag != nil && !*(*clips).TransFlag {
+				if clips := editorObjectClips(&object); *clips != nil && !(*clips).usesObjectMatrix() {
 					*clips = transformObjectClips(*clips, TranslationMatrix(matrix.e, matrix.f))
 				}
 				fragment, err = editorXMLObject(n.data, n.node, n.object, object)
@@ -943,7 +941,7 @@ func compositeBoundary(object GraphicObject, parent Matrix, inward bool) Graphic
 	case "ImageObject":
 		object.ImageObject.Boundary = editorBoxString(box)
 	}
-	if clips := editorObjectClips(&object); *clips != nil && (*clips).TransFlag != nil && !*(*clips).TransFlag {
+	if clips := editorObjectClips(&object); *clips != nil && !(*clips).usesObjectMatrix() {
 		*clips = transformObjectClips(*clips, clipMatrix)
 	}
 	return object

ofdgo_editor_composite_copy.go

@@ -299,7 +299,7 @@ func (e *Editor) pasteCompositeSelection(selection *CompositeSelection, paste fu
 				return err
 			}
 			clips := *editorObjectClips(&copy.object)
-			matrix, ok := copy.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+			matrix, ok := copy.matrix(clips.usesObjectMatrix()).Invert()
 			if !ok {
 				return fmt.Errorf("composite clip transform is not invertible")
 			}

ofdgo_editor_composite_image.go

@@ -43,7 +43,7 @@ func (e *Editor) CropCompositeImage(page int, path ObjectPath, index int, box Bo
 			return fmt.Errorf("crop does not intersect the image")
 		}
 		clips := node.object.ImageObject.Clips
-		inverse, _ := node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+		inverse, _ := node.matrix(clips.usesObjectMatrix()).Invert()
 		shape, err := NewShape(ShapeRectangle, box)
 		if err != nil {
 			return err
@@ -143,7 +143,7 @@ func (e *Editor) FitCompositeImage(page int, path ObjectPath, index int, mode st
 			frame = TranslationMatrix(box.X, box.Y).Multiply(node.parent)
 		}
 		clips := object.ImageObject.Clips
-		inverse, _ := node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+		inverse, _ := node.matrix(clips.usesObjectMatrix()).Invert()
 		return appendCompositeClip(node, shape, inverse.Multiply(frame), true)
 	})
 }
@@ -192,7 +192,7 @@ func appendCompositeClip(node *editorCompositeNode, shape PathObject, matrix Mat
 		state.crop = &crop
 	}
 	data, err := encodeOFDXML(func(x *ofdXML) {
-		x.clips(&Clips{Clip: []Clip{clip}})
+		x.clips(&Clips{Clip: []Clip{clip}}, "")
 	})
 	if err != nil {
 		return err
@@ -209,8 +209,12 @@ func appendCompositeClip(node *editorCompositeNode, shape PathObject, matrix Mat
 		patch = editorXMLContent(node.data, original, content)
 	} else {
 		data = editorXMLEncodedFragment(data, root)
-		content := append(data, node.data[node.node.open:node.node.close]...)
+		if actions := node.node.child("Actions"); actions != nil {
-		patch = editorXMLContent(node.data, node.node, content)
+			patch = editorXMLPatch{actions.end, actions.end, data}
+		} else {
+			content := append(data, node.data[node.node.open:node.node.close]...)
+			patch = editorXMLContent(node.data, node.node, content)
+		}
 	}
 	updated, err := newEditorCompositeNode(editorPatchXML(node.data, []editorXMLPatch{patch}))
 	if err != nil {

ofdgo_editor_erase.go

@@ -133,7 +133,7 @@ func (e *Editor) eraseCompositeObjects(page int, path ObjectPath, indexes []int,
 				return fmt.Errorf("composite member cannot be erased")
 			}
 			clips := *editorObjectClips(&node.object)
-			inverse, ok := node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+			inverse, ok := node.matrix(clips.usesObjectMatrix()).Invert()
 			if !ok {
 				return fmt.Errorf("composite clip transform is not invertible")
 			}
@@ -212,7 +212,7 @@ func (e *Editor) eraseObjects(page int, ids []string, box Box, points []Point, r
 			*clips = &Clips{}
 		}
 		matrix := IdentityMatrix
-		if (*clips).TransFlag == nil || *(*clips).TransFlag {
+		if (*clips).usesObjectMatrix() {
 			if object.Type == "ImageObject" && ctm == "" {
 				ctm = Matrix{a: frame.W, d: frame.H}.String()
 			}

ofdgo_editor_reference.go

@@ -261,6 +261,11 @@ func (x *ofdXML) referenceElement(name string, value any) {
 	}
 	var attrs ofdAttrs
 	switch value := value.(type) {
+	case *Dest:
+		if value == nil {
+			return
+		}
+		attrs.add("PageID", value.PageID)
 	case ShdColor:
 		attrs.add("ColorSpace", value.ColorSpace)
 	case *ShdColor:

ofdgo_editor_transform.go

@@ -456,7 +456,7 @@ func transformEditorMatrix(object GraphicObject, matrix Matrix) GraphicObject {
 	local := TranslationMatrix(-after.X, -after.Y).Multiply(matrix).Multiply(TranslationMatrix(before.X, before.Y))
 	*ctm = local.Multiply(NewMatrix(*ctm)).String()
 	*boundary = editorBoxString(after)
-	if clips := editorObjectClips(&object); *clips != nil && (*clips).TransFlag != nil && !*(*clips).TransFlag {
+	if clips := editorObjectClips(&object); *clips != nil && !(*clips).usesObjectMatrix() {
 		*clips = transformObjectClips(*clips, local)
 	}
 	if !axisAlignedMatrix(matrix) && before.W > 0 && before.H > 0 {
@@ -469,13 +469,12 @@ func transformEditorMatrix(object GraphicObject, matrix Matrix) GraphicObject {
 			*clips = &copy
 		}
 		clipMatrix := local
-		if (*clips).TransFlag == nil || *(*clips).TransFlag {
+		if (*clips).usesObjectMatrix() {
 			if inverse, ok := NewMatrix(*ctm).Invert(); ok {
 				clipMatrix = inverse.Multiply(local)
 			} else {
 				*clips = transformObjectClips(*clips, NewMatrix(*ctm))
-				flag := false
+				(*clips).TransFlag = nil
-				(*clips).TransFlag = &flag
 			}
 		}
 		fill, stroke := true, false
@@ -526,17 +525,13 @@ func cropImageObject(image *ImageObject, box Box) error {
 	image.Boundary = editorBoxString(box)
 	image.Clips = nil
 	if box != full {
-		inverse, ok := NewMatrix(image.CTM).Invert()
-		if !ok {
-			return fmt.Errorf("image transform is not invertible")
-		}
 		path, err := NewShape(ShapeRectangle, Box{W: box.W, H: box.H})
 		if err != nil {
 			return err
 		}
 		fill, stroke := true, false
 		path.Fill, path.Stroke = &fill, &stroke
-		image.Clips = &Clips{Clip: []Clip{{Area: []ClipArea{{CTM: inverse.String(), Path: []PathObject{path}}}}}}
+		image.Clips = &Clips{Clip: []Clip{{Area: []ClipArea{{Path: []PathObject{path}}}}}}
 	}
 	return nil
 }

ofdgo_editor_xml.go

@@ -373,6 +373,19 @@ func editorXMLObject(data []byte, node *editorXML, before, after GraphicObject)
 // 入参: data 原文, node 原节点, oldXML 修改前编码, newXML 修改后编码
 // 返回: []byte 更新节点, error 错误信息
 func editorXMLMerge(data []byte, node *editorXML, oldXML, newXML []byte) ([]byte, error) {
+	legacyClip := node.name.Local == "Clips" && node.hasAttr("TransFlag")
+	if legacyClip {
+		var clips Clips
+		if err := xml.Unmarshal(data[node.start:node.end], &clips); err != nil {
+			return nil, err
+		}
+		clips.TransFlag = nil
+		var err error
+		oldXML, err = encodeOFDXML(func(x *ofdXML) { x.clips(&clips, "") })
+		if err != nil {
+			return nil, err
+		}
+	}
 	oldNode, err := parseEditorXML(oldXML)
 	if err != nil {
 		return nil, err
@@ -382,6 +395,9 @@ func editorXMLMerge(data []byte, node *editorXML, oldXML, newXML []byte) ([]byte
 		return nil, err
 	}
 	changes := make(map[string]string)
+	if legacyClip {
+		changes["TransFlag"] = ""
+	}
 	for _, attr := range append(oldNode.attrs, newNode.attrs...) {
 		if attr.Name.Space == "" && (oldNode.attr(attr.Name.Local) != newNode.attr(attr.Name.Local) || oldNode.hasAttr(attr.Name.Local) != newNode.hasAttr(attr.Name.Local)) {
 			changes[attr.Name.Local] = newNode.attr(attr.Name.Local)

ofdgo_geom_backend.go

@@ -47,7 +47,7 @@ type StrokeOptions struct {
 }
 
 // GeometryBackend 操作库自有路径，坐标以页面左上角为原点，不修改任何输入
-// Clip返回nil表示不裁剪，空路径指针表示完全裁去，矩阵映射到页面坐标
+// Clip返回nil表示不裁剪，空路径指针表示完全裁去，矩阵将裁剪坐标映射到页面坐标
 type GeometryBackend interface {
 	Backend
 	Path(object PathObject) (GeometryPath, error)

ofdgo_object.go

@@ -47,6 +47,12 @@ func (o GraphicObject) Actions() []Action {
 	return nil
 }
 
+// usesObjectMatrix 判断旧式扩展是否要求裁剪跟随对象变换，标准裁剪以外接矩形为基准
+// 返回: bool 是否叠加对象CTM
+func (clips *Clips) usesObjectMatrix() bool {
+	return clips != nil && clips.TransFlag != nil && *clips.TransFlag
+}
+
 // UnmarshalXML 解析路径并区分省略样式、显式实线与零线宽
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息

ofdgo_page.go

@@ -62,7 +62,8 @@ type GraphicObject struct {
 	state                editorCompositeState
 }
 
-// Clips 裁剪区域集合
+// Clips 相对于对象外接矩形的裁剪集合
+// TransFlag仅兼容旧式扩展，写入时折算为Area的CTM
 type Clips struct {
 	TransFlag *bool  `xml:"TransFlag,attr"`
 	Clip      []Clip `xml:"Clip"`

ofdgo_pdf.go

@@ -502,7 +502,7 @@ func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) (*Clips, error) {
 			continue
 		}
 		if clips == nil {
-			clips = &Clips{TransFlag: new(false), Clip: make([]Clip, 0, len(paths))}
+			clips = &Clips{Clip: make([]Clip, 0, len(paths))}
 			areas = make([]ClipArea, len(paths))
 			if origin.X != 0 || origin.Y != 0 {
 				translation = pdfNumbers(1, 0, 0, 1, -origin.X, -origin.Y)

ofdgo_pdf_clip_group.go

@@ -74,7 +74,7 @@ func pdfPageClip(object GraphicObject) *Clips {
 		return nil
 	}
 	clips := *editorObjectClips(&object)
-	if clips == nil || clips.TransFlag == nil || *clips.TransFlag || len(clips.Clip) == 0 {
+	if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) == 0 {
 		return nil
 	}
 	boundary, _ := editorGeometry(object)
@@ -87,7 +87,7 @@ func pdfPageClip(object GraphicObject) *Clips {
 		translation = pdfNumbers(1, 0, 0, 1, -box.X, -box.Y)
 	}
 	bytes := 0
-	result := &Clips{TransFlag: clips.TransFlag, Clip: make([]Clip, len(clips.Clip))}
+	result := &Clips{Clip: make([]Clip, len(clips.Clip))}
 	for index, clip := range clips.Clip {
 		if len(clip.Area) != 1 || clip.Area[0].CTM != translation {
 			return nil
@@ -113,7 +113,7 @@ func pdfMatchesPageClip(object GraphicObject, pageClip *Clips) bool {
 		return false
 	}
 	clips := *editorObjectClips(&object)
-	if clips == nil || clips.TransFlag == nil || *clips.TransFlag || len(clips.Clip) != len(pageClip.Clip) {
+	if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) != len(pageClip.Clip) {
 		return false
 	}
 	boundary, _ := editorGeometry(object)

ofdgo_render_text.go

@@ -373,10 +373,7 @@ func (r *Renderer) objectGeometryClip(clips *Clips, boundary string, local Matri
 		return clip, nil
 	}
 	matrix, _ := renderObjectMatrix(boundary, local, state)
-	if clips.TransFlag != nil && !*clips.TransFlag {
+	if !clips.usesObjectMatrix() {
-		copy := *clips
-		copy.TransFlag = nil
-		clips = &copy
 		box, _ := ParseBox(boundary)
 		matrix = TranslationMatrix(box.X, box.Y)
 		if state.BoundaryInCTM && state.Parent != nil {

ofdgo_render_walk.go

@@ -225,10 +225,8 @@ func (r *Renderer) walkComposite(object CompositeGraphicUnit, state RenderState,
 		return err
 	}
 	clips, clipMatrix := object.Clips, matrix
-	if clips != nil && clips.TransFlag != nil && !*clips.TransFlag {
+	if !clips.usesObjectMatrix() {
-		copy := *clips
+		clipMatrix = boundary
-		copy.TransFlag = nil
-		clips, clipMatrix = &copy, boundary
 	}
 	if clips != nil {
 		geometry, err := r.Geometry()

ofdgo_renderer_clip_canvas.go

@@ -86,9 +86,9 @@ func (r *Renderer) buildObjectClipPath(clips *Clips, pageH float64, boundary str
 }
 
 // buildClipPath 构建裁剪路径
-// 入参: clips 裁剪对象, pageH 页面高度, bx 边界X坐标, by 边界Y坐标, objectCTM 对象CTM
+// 入参: clips 裁剪对象, pageH 页面高度, bx 边界X坐标, by 边界Y坐标, matrix 裁剪坐标到页面的变换
 // 返回: *canvas.Path 路径对象
-func (r *Renderer) buildClipPath(clips *Clips, pageH float64, bx, by float64, objectCTM Matrix) *canvas.Path {
+func (r *Renderer) buildClipPath(clips *Clips, pageH float64, bx, by float64, matrix Matrix) *canvas.Path {
 	if clips == nil {
 		return nil
 	}
@@ -96,10 +96,7 @@ func (r *Renderer) buildClipPath(clips *Clips, pageH float64, bx, by float64, ob
 	for _, clip := range clips.Clip {
 		renderer := &clipRenderer{}
 		for _, area := range clip.Area {
-			areaCTM := NewMatrix(area.CTM)
+			areaCTM := matrix.Multiply(NewMatrix(area.CTM))
-			if clips.TransFlag == nil || *clips.TransFlag {
-				areaCTM = objectCTM.Multiply(areaCTM)
-			}
 			for _, pathObj := range area.Path {
 				renderer.add(r.buildClipAreaPath(pathObj, area.DrawParam, areaCTM, pageH, bx, by))
 				if r.renderError != nil {

ofdgo_renderer_geom_canvas.go

@@ -181,7 +181,7 @@ func (CanvasBackend) Stroke(path GeometryPath, options StrokeOptions) (result Ge
 }
 
 // Clip 解析对象裁剪并与父裁剪相交，保留未裁剪与完全裁去的区别
-// 入参: r 渲染器, clips OFD裁剪, matrix 页面变换, parent 父裁剪
+// 入参: r 渲染器, clips OFD裁剪, matrix 裁剪坐标到页面的变换, parent 父裁剪
 // 返回: *GeometryPath 页面裁剪, error 无效父路径错误
 func (CanvasBackend) Clip(r *Renderer, clips *Clips, matrix Matrix, parent *GeometryPath) (*GeometryPath, error) {
 	p, err := geometryToCanvasPath(parent)

ofdgo_writer.go

@@ -870,17 +870,22 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 	x.start(object.Type, attrs)
 	x.actions(actions)
 	if object.Type == "ImageObject" {
-		x.clips(object.ImageObject.Clips)
+		ctm := object.ImageObject.CTM
+		if ctm == "" && object.ImageObject.Clips.usesObjectMatrix() {
+			box, _ := ParseBox(object.ImageObject.Boundary)
+			ctm = (Matrix{a: box.W, d: box.H}).String()
+		}
+		x.clips(object.ImageObject.Clips, ctm)
 		x.border(object.ImageObject.Border)
 	} else if object.Type == "CompositeObject" || object.Type == "CompositeGraphicUnit" {
-		x.clips(object.CompositeGraphicUnit.Clips)
+		x.clips(object.CompositeGraphicUnit.Clips, object.CompositeGraphicUnit.CTM)
 	} else if object.Type == "PathObject" || object.Type == "Path" {
-		x.clips(object.PathObject.Clips)
+		x.clips(object.PathObject.Clips, object.PathObject.CTM)
 		x.color("StrokeColor", stroke)
 		x.color("FillColor", fill)
 		x.text("AbbreviatedData", object.PathObject.AbbreviatedData)
 	} else if object.Type == "TextObject" || object.Type == "Text" {
-		x.clips(object.TextObject.Clips)
+		x.clips(object.TextObject.Clips, object.TextObject.CTM)
 		x.color("FillColor", fill)
 		x.color("StrokeColor", stroke)
 		offset, index := 0, 0
@@ -917,15 +922,17 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 	x.end(object.Type)
 }
 
-// clips 写出对象裁剪，保留区域内的路径与文字
+// clips 写出标准裁剪，将旧式随动裁剪折算为区域变换
-// 入参: clips 裁剪集合，nil不输出节点
+// 入参: clips 裁剪集合，nil不输出节点, ctm 对象变换矩阵
-func (x *ofdXML) clips(clips *Clips) {
+func (x *ofdXML) clips(clips *Clips, ctm string) {
 	if clips == nil || !x.checkContext() {
 		return
 	}
-	var attrs ofdAttrs
+	matrix := IdentityMatrix
-	attrs.flag("TransFlag", clips.TransFlag)
+	if clips.usesObjectMatrix() {
-	x.start("Clips", attrs)
+		matrix = NewMatrix(ctm)
+	}
+	x.start("Clips", nil)
 	for _, clip := range clips.Clip {
 		if x.err != nil {
 			return
@@ -936,6 +943,9 @@ func (x *ofdXML) clips(clips *Clips) {
 				return
 			}
 			var attrs ofdAttrs
+			if clips.usesObjectMatrix() {
+				area.CTM = matrix.Multiply(NewMatrix(area.CTM)).String()
+			}
 			attrs.add("CTM", area.CTM)
 			attrs.add("DrawParam", area.DrawParam)
 			for _, path := range area.Path {