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feat(转换渲染): 保留PDF结构并优化渲染
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xiaoqidun committed 2026-10-18 18:08:52 +08:00
1 parent 627a06cda3
commit a2de650b52
31 files changed
+2166 -249
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ofdgo_pdf_group.go
+40 -24
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@@ -35,6 +35,7 @@ type pdfPaintRegion struct {
paint pdfgo.Paint
path GeometryPath
intent pdfgo.Name
origin pdfObjectOrigin
}
// group 将单色图元的透明组转换为互不重叠的填充区域，保留矢量与组不透明度
@@ -47,9 +48,6 @@ func (p *pdfImporter) group(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error
if mark.BlendMode != "" && mark.BlendMode != "Normal" && mark.BlendMode != "Compatible" {
return &pdfgo.UnsupportedError{Feature: "group blend mode " + string(mark.BlendMode)}
}
if err := p.flushPath(); err != nil {
return err
}
if mark.ColorSpace != nil && !mark.ColorSpace.SRGBEquivalent() {
if mark.Alpha != 1 || mark.SoftMask != nil {
return &pdfgo.UnsupportedError{Feature: "non-sRGB group color space"}
@@ -72,10 +70,7 @@ func (p *pdfImporter) group(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error
}
}
if mark.Alpha == 1 {
if err := walk(visitor); err != nil {
return err
}
return p.flushPath()
return walk(visitor)
}
err := p.groupPaths(mark, walk, visitor)
if errors.Is(err, errPDFGroupRaster) && p.warning != nil {
@@ -140,6 +135,7 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
var combined GeometryPath
var paint *pdfgo.Paint
var intent pdfgo.Name
var origin pdfObjectOrigin
var clips []pdfgo.Path
opaque := true
scale := math.Hypot(p.matrix[0], p.matrix[1])
@@ -185,13 +181,15 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
if paint == nil {
paint, clips = &color, path.Style.Clips
intent = path.Style.RenderingIntent
origin = pdfObjectOrigin{sequence: path.Sequence}
} else if !reflect.DeepEqual(clips, path.Style.Clips) {
return fmt.Errorf("%w: independently clipped group content", errPDFGroupRaster)
} else if color.Alpha != 1 || !reflect.DeepEqual(*paint, color) || intent != path.Style.RenderingIntent {
regions = append(regions, pdfPaintRegion{*paint, combined, intent})
regions = append(regions, pdfPaintRegion{*paint, combined, intent, origin})
combined = nil
paint = &color
intent = path.Style.RenderingIntent
origin = pdfObjectOrigin{sequence: path.Sequence}
}
outline := shape
evenOdd := path.Path.EvenOdd
@@ -242,7 +240,14 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
if err := p.ctx.Err(); err != nil {
return err
}
combined = append(combined, outline...)
if len(outline) != 0 {
if len(combined) == 0 {
origin = pdfObjectOrigin{sequence: path.Sequence}
} else {
origin = origin.merge(pdfObjectOrigin{sequence: path.Sequence})
}
combined = append(combined, outline...)
}
}
return nil
}
@@ -252,10 +257,12 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
if err := p.ctx.Err(); err != nil {
return err
}
if len(combined) == 0 {
if len(combined) != 0 {
regions = append(regions, pdfPaintRegion{*paint, combined, intent, origin})
}
if len(regions) == 0 {
return nil
}
regions = append(regions, pdfPaintRegion{*paint, combined, intent})
if !opaque {
regions, err = pdfCompositeRegions(geometry, regions)
if err != nil {
@@ -310,7 +317,7 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
return err
}
object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: data, Fill: &fill, Stroke: &stroke, FillColor: color, Clips: objectClips}
p.appendObject(GraphicObject{Type: "PathObject", PathObject: object})
p.appendOriginObject(GraphicObject{Type: "PathObject", PathObject: object}, region.origin)
p.report.PathObjects++
}
return nil
@@ -320,7 +327,15 @@ func (p *pdfImporter) groupPaths(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
// 入参: mark 组状态, walk 内容访问函数
// 返回: error 转换或渲染错误
func (p *pdfImporter) rasterGroup(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
img, box, err := p.renderGroup(func(local *pdfImporter) error { return walk(local.visitor()) }, nil)
var origin pdfObjectOrigin
img, box, err := p.renderGroup(func(local *pdfImporter) error {
if err := walk(local.visitor()); err != nil {
return err
}
var err error
origin, err = local.objects.combinedOrigin(local.ctx)
return err
}, nil)
if err != nil || img == nil {
return err
}
@@ -330,7 +345,7 @@ func (p *pdfImporter) rasterGroup(mark pdfgo.GroupMark, walk func(pdfgo.Visitor)
return err
}
}
return p.appendRasterGroup(img, box, mark.Alpha)
return p.appendRasterGroup(img, box, mark.Alpha, origin)
}
// visitor 绑定当前导入器的图元与透明组访问函数
@@ -385,16 +400,13 @@ func (p *pdfImporter) compileGroup(build func(*pdfImporter) error) (*RasterPage,
if p.clipPaths == nil {
p.clipPaths = &renderCache[[32]byte, pdfClipPath]{limit: 8 << 20}
}
local := pdfImporter{ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer, matrix: p.matrix, pageBox: p.pageBox, pageWidth: p.pageWidth, pageHeight: p.pageHeight, rasterDPI: p.rasterDPI, warning: p.warning, rasterWarned: true, fontIDs: map[*pdfgo.Font]string{}, fonts: p.fonts, symbolFonts: p.symbolFonts, clipPaths: p.clipPaths}
local := pdfImporter{ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer, matrix: p.matrix, pageBox: p.pageBox, pageWidth: p.pageWidth, pageHeight: p.pageHeight, rasterDPI: p.rasterDPI, warning: p.warning, rasterWarned: true, fontIDs: map[*pdfgo.Font]string{}, fonts: p.fonts, symbolFonts: p.symbolFonts, clipPaths: p.clipPaths, textOrigins: p.textOrigins}
if err := build(&local); err != nil {
return nil, box, err
}
if err := p.ctx.Err(); err != nil {
return nil, box, err
}
if err := local.flushPath(); err != nil {
return nil, box, err
}
if local.objects.len() == 0 {
return nil, box, nil
}
@@ -492,9 +504,9 @@ func (p *pdfImporter) renderGroupSceneInto(source *RasterPage, box Box, target *
}
// appendRasterGroup 保存局部合成结果并记录输出精度
// 入参: img 透明图像, box 页面区域, opacity 组透明度
// 入参: img 透明图像, box 页面区域, opacity 组透明度, origin 来源区段
// 返回: error 保存错误
func (p *pdfImporter) appendRasterGroup(img image.Image, box Box, opacity float64) error {
func (p *pdfImporter) appendRasterGroup(img image.Image, box Box, opacity float64, origin pdfObjectOrigin) error {
var data bytes.Buffer
if err := pdfgo.EncodePNG(p.ctx, &data, img); err != nil {
return err
@@ -508,7 +520,7 @@ func (p *pdfImporter) appendRasterGroup(img image.Image, box Box, opacity float6
}
alpha := int(math.Round(opacity * 255))
object := ImageObject{ResourceID: id, Boundary: pdfBoundary(box), CTM: pdfNumbers(box.W, 0, 0, box.H, 0, 0), Alpha: &alpha}
p.appendObject(GraphicObject{Type: "ImageObject", ImageObject: object})
p.appendOriginObject(GraphicObject{Type: "ImageObject", ImageObject: object}, origin)
p.report.ImageObjects++
if !p.rasterWarned {
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF effect locally composited at %g DPI; other objects retained", p.rasterDPI)})
@@ -531,7 +543,7 @@ func pdfCompositeRegions(geometry GeometryBackend, regions []pdfPaintRegion) ([]
return nil, err
}
if len(outside) != 0 {
next = append(next, pdfPaintRegion{backdrop.paint, outside, backdrop.intent})
next = append(next, pdfPaintRegion{backdrop.paint, outside, backdrop.intent, backdrop.origin})
}
overlap, err := geometry.Combine(backdrop.path, source.path, GeometryIntersect)
if err != nil {
@@ -542,7 +554,11 @@ func pdfCompositeRegions(geometry GeometryBackend, regions []pdfPaintRegion) ([]
for i := range paint.RGB {
paint.RGB[i] = (source.paint.RGB[i]*source.paint.Alpha + backdrop.paint.RGB[i]*backdrop.paint.Alpha*(1-source.paint.Alpha)) / paint.Alpha
}
next = append(next, pdfPaintRegion{paint, overlap, ""})
origin := source.origin
if source.paint.Alpha != 1 {
origin = backdrop.origin.merge(origin)
}
next = append(next, pdfPaintRegion{paint, overlap, "", origin})
}
remaining, err = geometry.Combine(remaining, backdrop.path, GeometrySubtract)
if err != nil {
@@ -550,7 +566,7 @@ func pdfCompositeRegions(geometry GeometryBackend, regions []pdfPaintRegion) ([]
}
}
if len(remaining) != 0 {
next = append(next, pdfPaintRegion{source.paint, remaining, source.intent})
next = append(next, pdfPaintRegion{source.paint, remaining, source.intent, source.origin})
}
result = next
}