feat(渲染引擎): 修复裁剪并优化渲染

go.mod

@@ -10,7 +10,7 @@ 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 v0.0.0-20261003042717-ffb073d5634d
+	github.com/xiaoqidun/pdfgo v0.0.0-20261003103143-2420f94d9b97
 	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 v0.0.0-20261003042717-ffb073d5634d h1:WiG6LgYU1hZBAELi72qP6UnCyA8cPe7Ap6nto0ofGnA=
-github.com/xiaoqidun/pdfgo v0.0.0-20261003042717-ffb073d5634d/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
+github.com/xiaoqidun/pdfgo v0.0.0-20261003103143-2420f94d9b97 h1:1YHWQ3BBFJd4RlWAEGhHHQ6D+OI/nriU91YIUzxZo8o=
+github.com/xiaoqidun/pdfgo v0.0.0-20261003103143-2420f94d9b97/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_editor_documents.go

@@ -330,7 +330,14 @@ func (e *Editor) documentRoot() string {
 // 返回: bool 是否为同一文档
 func (e *Editor) sameDocument(other *Editor) bool {
 	if e.source == nil || other.source == nil {
-		return e.source == nil && other.source == nil
+		if e.source == nil && other.source == nil {
+			return true
+		}
+		fresh, packaged := e, other
+		if fresh.source != nil {
+			fresh, packaged = other, e
+		}
+		return len(packaged.source.reader.OFD.DocBody) == 1 && (packaged.source.fromNew || fresh.Info.DocID != "" && fresh.Info.DocID == packaged.source.info.DocID)
 	}
 	return e.documentRoot() == other.documentRoot() && e.source.info.DocID == other.source.info.DocID
 }

ofdgo_editor_import.go

@@ -684,6 +684,7 @@ func (e *Editor) importBase() (*editorSource, error) {
 		return nil, err
 	}
 	editor.source.idsReady = true
+	editor.source.fromNew = true
 	return editor.source, nil
 }
 

ofdgo_editor_open.go

@@ -36,6 +36,7 @@ type editorSource struct {
 	info               DocInfo
 	fallbackDocID      string
 	directory          string
+	fromNew            bool
 	pages              map[string]*editorSourcePage
 	origins            map[string]*editorObjectOrigin
 	idsReady           bool

ofdgo_pdf.go

@@ -78,7 +78,7 @@ type pdfImporter struct {
 	pages            map[pdfgo.Reference]*pdfgo.Page
 	pageIDs          map[pdfgo.Reference]string
 	pageIndexes      map[pdfgo.Reference]int
-	imageIDs         map[pdfImageKey]string
+	imageIDs         map[pdfImageKey][]pdfImageResource
 	attachmentIDs    map[pdfAttachmentKey]string
 	maskClips        map[*pdfgo.SoftMask]pdfgo.Path
 	pageBox          pdfgo.Rectangle

ofdgo_pdf_object.go

@@ -20,6 +20,7 @@ import (
 	"image"
 	"image/color"
 	"math"
+	"reflect"
 	"strconv"
 	"unicode/utf8"
 
@@ -32,6 +33,12 @@ type pdfImageKey struct {
 	intent pdfgo.Name
 }
 
+// pdfImageResource 保存图像的有效颜色空间及对应资源，避免跨资源重映射复用
+type pdfImageResource struct {
+	space pdfgo.Object
+	id    string
+}
+
 // pdfStencilImage 按当前填充色读取模板图像，不分配整幅彩色样本
 type pdfStencilImage struct {
 	source image.Image
@@ -103,9 +110,14 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 	}
 	source := mark.Image
 	key := pdfImageKey{stream: source.Stream, intent: source.Intent}
-	id := p.imageIDs[key]
-	if source.ImageMask {
-		id = ""
+	id := ""
+	if !source.ImageMask {
+		for _, resource := range p.imageIDs[key] {
+			if reflect.DeepEqual(resource.space, source.ColorSpace) {
+				id = resource.id
+				break
+			}
+		}
 	}
 	if id == "" {
 		jbig2Original, err := source.JBIG2File()
@@ -155,9 +167,9 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 		}
 		if !source.ImageMask {
 			if p.imageIDs == nil {
-				p.imageIDs = map[pdfImageKey]string{}
+				p.imageIDs = map[pdfImageKey][]pdfImageResource{}
 			}
-			p.imageIDs[key] = id
+			p.imageIDs[key] = append(p.imageIDs[key], pdfImageResource{space: source.ColorSpace, id: id})
 		}
 	}
 	return p.appendImage(mark, id)

ofdgo_renderer_clip_canvas.go

@@ -160,11 +160,23 @@ func intersectClipPath(parent, current *canvas.Path) *canvas.Path {
 	if parent.Empty() || current.Empty() {
 		return &canvas.Path{}
 	}
-	if parentOK && parentRect.Contains(current.FastBounds()) {
-		return current
+	if parentOK {
+		bounds := current.Bounds()
+		if parentRect.Contains(bounds) {
+			return current
+		}
+		if !parentRect.Overlaps(bounds) {
+			return &canvas.Path{}
+		}
 	}
-	if currentOK && currentRect.Contains(parent.FastBounds()) {
-		return parent
+	if currentOK {
+		bounds := parent.Bounds()
+		if currentRect.Contains(bounds) {
+			return parent
+		}
+		if !currentRect.Overlaps(bounds) {
+			return &canvas.Path{}
+		}
 	}
 	if result, ok := intersectConvexCanvasPaths(parent, current); ok {
 		return result
@@ -199,7 +211,7 @@ func applyClipPath(path, clip *canvas.Path) *canvas.Path {
 		return &canvas.Path{}
 	}
 	if rect, ok := rectangularPath(clip); ok {
-		bounds := path.FastBounds()
+		bounds := path.Bounds()
 		if rect.Contains(bounds) {
 			return path
 		}
@@ -224,18 +236,25 @@ func rectangularPath(path *canvas.Path) (canvas.Rect, bool) {
 		return canvas.Rect{}, false
 	}
 	data := path.Data()
+	if len(data) != 20 {
+		return canvas.Rect{}, false
+	}
 	for i := 0; i < len(data); i += 4 {
-		if i+4 > len(data) || (data[i] != canvas.MoveToCmd && data[i] != canvas.LineToCmd && data[i] != canvas.CloseCmd) {
+		if data[i] != canvas.MoveToCmd && data[i] != canvas.LineToCmd && data[i] != canvas.CloseCmd {
 			return canvas.Rect{}, false
 		}
 	}
-	points := path.Coords()
-	if len(points) != 5 || !points[0].Equals(points[4]) {
+	if !(canvas.Point{X: data[1], Y: data[2]}).Equals(canvas.Point{X: data[17], Y: data[18]}) {
 		return canvas.Rect{}, false
 	}
 	rect := path.FastBounds()
 	corners := 0
-	for _, point := range points[:4] {
+	for i := 0; i < 16; i += 4 {
+		point := canvas.Point{X: data[i+1], Y: data[i+2]}
+		next := (i + 4) % 16
+		if !canvas.Equal(point.X, data[next+1]) && !canvas.Equal(point.Y, data[next+2]) {
+			return canvas.Rect{}, false
+		}
 		corner := 0
 		switch {
 		case canvas.Equal(point.X, rect.X0) && canvas.Equal(point.Y, rect.Y0):

ofdgo_renderer_path_canvas.go

@@ -368,7 +368,7 @@ func (r *Renderer) renderPattern(ctx *canvas.Context, pattern *PatternPaint, pag
 	if !ok {
 		return
 	}
-	bounds := clip.FastBounds()
+	bounds := clip.Bounds()
 	points := [][2]float64{
 		{bounds.X0, pageH - bounds.Y0},
 		{bounds.X1, pageH - bounds.Y0},

ofdgo_renderer_shading_canvas.go

@@ -60,7 +60,7 @@ func (r *Renderer) drawSampledShading(ctx *canvas.Context, path *canvas.Path, vi
 	if path.Empty() {
 		return
 	}
-	bounds := path.FastBounds().And(shdCanvasBounds(ctx))
+	bounds := path.Bounds().And(shdCanvasBounds(ctx))
 	if bounds.W() <= 0 || bounds.H() <= 0 {
 		return
 	}
@@ -243,7 +243,7 @@ func drawRepeatAxialPath(ctx *canvas.Context, path *canvas.Path, gradient *repea
 	p = p.Transform(view.Inv())
 	d := gradient.End.Sub(gradient.Start).Mul(gradient.period)
 	axis := canvas.Matrix{{d.X, -d.Y, gradient.Start.X}, {d.Y, d.X, gradient.Start.Y}}
-	bounds := p.FastBounds().And(shdCanvasBounds(ctx).Transform(view.Inv()))
+	bounds := p.Bounds().And(shdCanvasBounds(ctx).Transform(view.Inv()))
 	area := bounds.Transform(axis.Inv())
 	origin := ctx.CoordView().Dot(canvas.Point{})
 	m := ctx.CoordSystemView().Mul(ctx.View()).Translate(origin.X, origin.Y).Mul(view)