feat(字体图像): 优化字体图像与导出稳定性

go.mod

@@ -8,9 +8,9 @@ require (
 	github.com/go-text/typesetting v0.3.5
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20261010204837-88a7f6b56918
-	github.com/xiaoqidun/j2kgo v1.0.1
-	github.com/xiaoqidun/jbig2 v1.1.7
-	github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5
+	github.com/xiaoqidun/j2kgo v1.0.2
+	github.com/xiaoqidun/jbig2 v1.1.8
+	github.com/xiaoqidun/pdfgo v0.0.0-20261016003351-18348c283ac1
 	golang.org/x/crypto v0.58.0
 	golang.org/x/image v0.47.0
 	golang.org/x/text v0.43.0

go.sum

@@ -58,12 +58,12 @@ github.com/tdewolff/parse/v2 v2.8.16 h1:bLk5svUOQRkW/Y2SJ+DeENSIkZBcTIkq+Atyv5D8
 github.com/tdewolff/parse/v2 v2.8.16/go.mod h1:XdsoSFThlVIRIajAuqz1evNY7bagZS8LBOPA3aVopwQ=
 github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
-github.com/xiaoqidun/j2kgo v1.0.1 h1:W0SytzjvgiOhXwq+JNRSVKLB847fjGOvGWTNKqmwvo0=
-github.com/xiaoqidun/j2kgo v1.0.1/go.mod h1:DCwAfuDzCDYqUiAlZ7BDwigTjaXw7o9L1FtEma/D1aA=
-github.com/xiaoqidun/jbig2 v1.1.7 h1:118d2lQn2ZsupmXazK+2p23Jp5xQ09btBmPUoYoa/+Y=
-github.com/xiaoqidun/jbig2 v1.1.7/go.mod h1:9jromqVwMqlptUDEt6Yip8vqYA5I1YjhG7FgMl/Z2dA=
-github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5 h1:eJuai2A2q9R8Mo/oKXiIpNc41uzolkKplPWXUmYiHcU=
-github.com/xiaoqidun/pdfgo v0.0.0-20261015160218-fa5114475eb5/go.mod h1:FUQ8+TfNoec6tZCdsckx+rrD25JACm7EzuZyFH37QHg=
+github.com/xiaoqidun/j2kgo v1.0.2 h1:OAjjEOfaBaQzBNcj9wx+eM68UI5pewR6SzNZa1R1DIw=
+github.com/xiaoqidun/j2kgo v1.0.2/go.mod h1:DCwAfuDzCDYqUiAlZ7BDwigTjaXw7o9L1FtEma/D1aA=
+github.com/xiaoqidun/jbig2 v1.1.8 h1:dERPW7F8gs18a/DOD9gXHR3fP1Vl6KhCNsLnq5l3BIo=
+github.com/xiaoqidun/jbig2 v1.1.8/go.mod h1:9jromqVwMqlptUDEt6Yip8vqYA5I1YjhG7FgMl/Z2dA=
+github.com/xiaoqidun/pdfgo v0.0.0-20261016003351-18348c283ac1 h1:PNucIHG+qid5/GCN3wUGEqfsyrykhoazBbtPaGysWHk=
+github.com/xiaoqidun/pdfgo v0.0.0-20261016003351-18348c283ac1/go.mod h1:AaabzsObZ8Z76AcaWbo6swRROrJsblyIGB7HbieeJA4=
 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=

internal/base/font/cff.go

@@ -1036,6 +1036,9 @@ func getCFFCharsetInfo(data []byte, numGlyphs int) ([]int, string, string, int,
 	if topDictData == nil {
 		return nil, "", "", 0, false
 	}
+	if _, _, _, err := scanCFFIndex(data, stringIndexOff); err != nil {
+		return nil, "", "", 0, false
+	}
 	td := parseCFFDict(topDictData)
 	registry, ordering := getCFFROS(data, stringIndexOff, td)
 	actual, err := parseCFFAndCountGlyphs(data)
@@ -1067,7 +1070,18 @@ func getCmapFromCFF(data []byte, numGlyphs int) map[rune]uint16 {
 	if !ok {
 		return nil
 	}
-	mapping := make(map[rune]uint16)
+	return cffCharsetMapping(data, sids, registry, ordering, stringIndexOff)
+}
+
+// cffCharsetMapping 根据已解析的CFF字符集恢复Unicode映射
+// 入参: data CFF数据, sids 字符标识, registry 注册机构, ordering 字符集, stringIndexOff 字符串索引偏移
+// 返回: map[rune]uint16 恢复的映射表
+func cffCharsetMapping(data []byte, sids []int, registry, ordering string, stringIndexOff int) map[rune]uint16 {
+	capacity := max(0, len(sids)-1)
+	if registry == "" || registry == "Adobe" && ordering == "GB1" {
+		capacity *= 2
+	}
+	mapping := make(map[rune]uint16, capacity)
 	if registry == "Adobe" && ordering == "GB1" {
 		for gid, cid := range sids {
 			if gid == 0 {
@@ -1100,7 +1114,7 @@ func getCmapFromCFF(data []byte, numGlyphs int) map[rune]uint16 {
 			}
 		} else {
 			idx := sid - 391
-			name = readStringIndexItem(data, stringIndexOff, idx)
+			name = string(readStringIndexItem(data, stringIndexOff, idx))
 		}
 		r := rune(0)
 		if name != "" {
@@ -1127,11 +1141,11 @@ func GetCFFCIDRuneMap(data []byte) map[uint16]rune {
 	if err != nil {
 		return nil
 	}
-	sids, registry, _, _, ok := getCFFCharsetInfo(cffData, numGlyphs)
+	sids, registry, ordering, stringIndexOff, ok := getCFFCharsetInfo(cffData, numGlyphs)
 	if !ok || registry == "" {
 		return nil
 	}
-	mapping := getCmapFromCFF(cffData, numGlyphs)
+	mapping := cffCharsetMapping(cffData, sids, registry, ordering, stringIndexOff)
 	if len(mapping) == 0 {
 		return nil
 	}
@@ -1187,7 +1201,7 @@ func getCFFData(data []byte) []byte {
 		}
 		offset := int(binary.BigEndian.Uint32(data[pos+8 : pos+12]))
 		length := int(binary.BigEndian.Uint32(data[pos+12 : pos+16]))
-		if offset < 0 || length < 0 || offset+length > len(data) {
+		if offset < 0 || length < 0 || offset > len(data) || length > len(data)-offset {
 			return nil
 		}
 		return data[offset : offset+length]
@@ -1269,31 +1283,29 @@ func parseCFFCharset(data []byte, offset, count int) ([]int, error) {
 
 // readStringIndexItem 读取CFF字符串索引项
 // 入参: data CFF数据, offset 索引偏移, idx 索引号
-// 返回: string 读取的字符串
-func readStringIndexItem(data []byte, offset int, idx int) string {
-	if offset >= len(data) {
-		return ""
+// 返回: []byte 共享原始数据的只读字符串，索引无效时为nil
+func readStringIndexItem(data []byte, offset int, idx int) []byte {
+	if offset < 0 || offset > len(data)-2 || idx < 0 {
+		return nil
 	}
 	count := int(binary.BigEndian.Uint16(data[offset:]))
+	if idx >= count || offset > len(data)-3 {
+		return nil
+	}
 	offSize := int(data[offset+2])
-	if idx >= count {
-		return ""
+	if offSize < 1 || offSize > 4 || count+1 > (len(data)-offset-3)/offSize {
+		return nil
 	}
 	offArrayStart := offset + 3
 	p1 := offArrayStart + idx*offSize
 	p2 := p1 + offSize
-	if p2+offSize > len(data) {
-		return ""
-	}
 	loc1 := readCFFOffset(data, p1, offSize)
 	loc2 := readCFFOffset(data, p2, offSize)
 	dataStart := offArrayStart + (count+1)*offSize
-	start := dataStart + loc1 - 1
-	length := loc2 - loc1
-	if start < 0 || start+length > len(data) {
-		return ""
+	if loc1 < 1 || loc2 < loc1 || loc2-1 > len(data)-dataStart {
+		return nil
 	}
-	return string(data[start : start+length])
+	return data[dataStart+loc1-1 : dataStart+loc2-1]
 }
 
 // getCFFROS 读取CID字体ROS信息
@@ -1317,7 +1329,7 @@ func getCFFSIDString(data []byte, stringIndexOff int, sid int) string {
 		return cffStandardStrings[sid]
 	}
 	if sid > 390 {
-		return readStringIndexItem(data, stringIndexOff, sid-391)
+		return string(readStringIndexItem(data, stringIndexOff, sid-391))
 	}
 	return ""
 }

internal/base/geom/arc.go

@@ -116,7 +116,7 @@ func centerArc(start Point, arc Segment) (geometryArc, error) {
 	}
 	angle := math.Mod(arc.Rotation, 360) * math.Pi / 180
 	sine, cosine := math.Sincos(angle)
-	dx, dy := (start.X-arc.End.X)/2, (start.Y-arc.End.Y)/2
+	dx, dy := arcCoordinateMean(start.X, -arc.End.X), arcCoordinateMean(start.Y, -arc.End.Y)
 	x, y := cosine*dx+sine*dy, -sine*dx+cosine*dy
 	scale := math.Hypot(x/rx, y/ry)
 	if scale > 1 {
@@ -139,13 +139,24 @@ func centerArc(start Point, arc Segment) (geometryArc, error) {
 	if !arc.Sweep && delta > 0 {
 		delta -= 2 * math.Pi
 	}
-	center := Point{cosine*cx - sine*cy + (start.X+arc.End.X)/2, sine*cx + cosine*cy + (start.Y+arc.End.Y)/2}
+	center := Point{cosine*cx - sine*cy + arcCoordinateMean(start.X, arc.End.X), sine*cx + cosine*cy + arcCoordinateMean(start.Y, arc.End.Y)}
 	if !finite(center.X) || !finite(center.Y) || !finite(rx) || !finite(ry) || !finite(delta) || !finite(theta) || delta == 0 {
 		return geometryArc{}, fmt.Errorf("invalid arc extent")
 	}
 	return geometryArc{center, Point{rx * cosine, rx * sine}, Point{-ry * sine, ry * cosine}, theta, delta}, nil
 }
 
+// arcCoordinateMean 计算有限坐标均值，仅在求和溢出时先减半，避免微小坐标提前下溢
+// 入参: a 第一个坐标, b 第二个坐标
+// 返回: float64 坐标均值
+func arcCoordinateMean(a, b float64) float64 {
+	value := (a + b) / 2
+	if math.IsInf(value, 0) {
+		return a/2 + b/2
+	}
+	return value
+}
+
 // point 计算椭圆参数对应的坐标
 // 入参: angle 参数角
 // 返回: Point 椭圆上的点

internal/base/geom/matrix.go

@@ -125,7 +125,7 @@ func (m Matrix) Invert() (Matrix, bool) {
 	return n, true
 }
 
-// matrixProductDifference 计算两个乘积之差，检查溢出、下溢及相消造成的精度损失
+// matrixProductDifference 补偿乘积相减的舍入残差，检查溢出、下溢及严重相消
 // 入参: a 第一个乘数, b 第二个乘数, c 第三个乘数, d 第四个乘数
 // 返回: float64 乘积之差, bool 是否可直接用于求逆
 func matrixProductDifference(a, b, c, d float64) (float64, bool) {
@@ -134,6 +134,9 @@ func matrixProductDifference(a, b, c, d float64) (float64, bool) {
 	if !finite(value) || x == 0 && a != 0 && b != 0 || y == 0 && c != 0 && d != 0 {
 		return value, false
 	}
+	if x != 0 && y != 0 {
+		value = math.FMA(a, b, -y) + math.FMA(-c, d, y)
+	}
 	return value, x == 0 && y == 0 || math.Abs(value) >= 0x1p-1022 && math.Abs(value) >= 0x1p-48*math.Max(math.Abs(x), math.Abs(y))
 }
 
@@ -169,7 +172,7 @@ func TranslationMatrix(x, y float64) Matrix {
 // YScale 获取Y轴缩放比例
 // 返回: float64 缩放比例
 func (m Matrix) YScale() float64 {
-	return math.Sqrt(m.c*m.c + m.d*m.d)
+	return math.Hypot(m.c, m.d)
 }
 
 // Equal 比较毫米坐标，使用固定绝对误差，不受绘图库全局精度影响

internal/base/geom/transform.go

@@ -33,10 +33,7 @@ func (p Path) Transform(matrix Matrix) (Path, error) {
 		}
 	}
 	matrixScale := math.Max(math.Max(math.Abs(matrix.a), math.Abs(matrix.b)), math.Max(math.Abs(matrix.c), math.Abs(matrix.d)))
-	determinant := 0.0
-	if matrixScale != 0 {
-		determinant = (matrix.a/matrixScale)*(matrix.d/matrixScale) - (matrix.b/matrixScale)*(matrix.c/matrixScale)
-	}
+	determinant, _ := matrixProductSum(matrix.a, matrix.d, -matrix.b, matrix.c)
 	transform := func(p Point) Point {
 		x, y := matrix.Transform(p.X, p.Y)
 		return Point{x, y}

internal/base/image/image.go

@@ -451,13 +451,11 @@ func GrayAt(img image.Image, x, y int) color.Gray {
 	case *colorImage:
 		return GrayAt(src.source, x, y)
 	case *maskedTIFFImage:
-		if src.NRGBA64At(x, y).A == 0 {
+		if src.alphaAt(x, y) == 0 {
 			return color.Gray{}
 		}
-		bounds, size := src.source.Bounds(), src.bounds.Size()
-		sx := bounds.Min.X + int((uint64(x-src.bounds.Min.X)*uint64(bounds.Dx())+uint64(bounds.Dx()/2))/uint64(size.X))
-		sy := bounds.Min.Y + int((uint64(y-src.bounds.Min.Y)*uint64(bounds.Dy())+uint64(bounds.Dy()/2))/uint64(size.Y))
-		return GrayAt(src.source, sx, sy)
+		point := src.samplePoint(src.source.Bounds(), x, y)
+		return GrayAt(src.source, point.X, point.Y)
 	case *transparentEdgeImage:
 		if x <= src.rect.Min.X || y <= src.rect.Min.Y || x >= src.rect.Max.X-1 || y >= src.rect.Max.Y-1 {
 			return color.Gray{}
@@ -534,6 +532,39 @@ func NRGBAAt(img image.Image, x, y int) color.NRGBA {
 // 返回: uint32 十六位透明度
 func AlphaAt(img image.Image, x, y int) uint32 {
 	switch source := img.(type) {
+	case *maskedTIFFImage:
+		return source.alphaAt(x, y)
+	case *image.YCbCr, *image.CMYK, *image.Gray, *image.Gray16:
+		return 65535
+	case *image.NYCbCrA:
+		if !image.Pt(x, y).In(source.Rect) {
+			return 0
+		}
+		return uint32(source.A[source.AOffset(x, y)]) * 257
+	case *orientedTIFFImage:
+		point, ok := source.sourcePoint(x, y)
+		if !ok {
+			return 0
+		}
+		return AlphaAt(source.source, point.X, point.Y)
+	case *planarTIFFImage:
+		if !image.Pt(x, y).In(source.bounds) {
+			return 0
+		}
+		if source.alpha != 0 {
+			index := 3
+			if source.cmyk {
+				index = 4
+			} else if source.gray || len(source.palette) != 0 {
+				index = 1
+			}
+			return uint32(source.sampleAt(index, x, y))
+		}
+		if len(source.palette) != 0 {
+			index := uint32(source.sampleAt(0, x, y)) * uint32(len(source.palette)-1) / 65535
+			return uint32(source.palette[index].A)
+		}
+		return 65535
 	case *image.RGBA:
 		if !(image.Point{X: x, Y: y}).In(source.Rect) {
 			return 0

internal/base/image/tiff_mask.go

@@ -49,6 +49,36 @@ func (s *maskedTIFFImage) Bounds() image.Rectangle { return s.bounds }
 // 返回: color.Model 颜色模型
 func (s *maskedTIFFImage) ColorModel() color.Model { return color.NRGBA64Model }
 
+// samplePoint 将显示坐标映射到主图或蒙版的像素中心
+// 入参: bounds 采样图像范围, x 横坐标, y 纵坐标
+// 返回: image.Point 采样坐标
+func (s *maskedTIFFImage) samplePoint(bounds image.Rectangle, x, y int) image.Point {
+	size := s.bounds.Size()
+	x, y = x-s.bounds.Min.X, y-s.bounds.Min.Y
+	if bounds.Size() == size {
+		return bounds.Min.Add(image.Pt(x, y))
+	}
+	return image.Pt(
+		bounds.Min.X+int((uint64(x)*uint64(bounds.Dx())+uint64(bounds.Dx()/2))/uint64(size.X)),
+		bounds.Min.Y+int((uint64(y)*uint64(bounds.Dy())+uint64(bounds.Dy()/2))/uint64(size.Y)),
+	)
+}
+
+// alphaAt 读取蒙版与主图透明度，不解算主图颜色
+// 入参: x 横坐标, y 纵坐标
+// 返回: uint32 十六位透明度
+func (s *maskedTIFFImage) alphaAt(x, y int) uint32 {
+	if !image.Pt(x, y).In(s.bounds) {
+		return 0
+	}
+	mask := s.samplePoint(s.mask.Bounds(), x, y)
+	if NRGBA64At(s.mask, mask.X, mask.Y).R == 0 {
+		return 0
+	}
+	source := s.samplePoint(s.source.Bounds(), x, y)
+	return AlphaAt(s.source, source.X, source.Y)
+}
+
 // NRGBA64At 按像素中心读取主图及蒙版，零位隐藏原图并保留隐藏颜色
 // 入参: x 横坐标, y 纵坐标
 // 返回: color.NRGBA64 非预乘十六位颜色
@@ -56,16 +86,10 @@ func (s *maskedTIFFImage) NRGBA64At(x, y int) color.NRGBA64 {
 	if !image.Pt(x, y).In(s.bounds) {
 		return color.NRGBA64{}
 	}
-	size := s.bounds.Size()
-	x, y = x-s.bounds.Min.X, y-s.bounds.Min.Y
-	b := s.source.Bounds()
-	sx := b.Min.X + int((uint64(x)*uint64(b.Dx())+uint64(b.Dx()/2))/uint64(size.X))
-	sy := b.Min.Y + int((uint64(y)*uint64(b.Dy())+uint64(b.Dy()/2))/uint64(size.Y))
-	pixel := NRGBA64At(s.source, sx, sy)
-	b = s.mask.Bounds()
-	mx := b.Min.X + int((uint64(x)*uint64(b.Dx())+uint64(b.Dx()/2))/uint64(size.X))
-	my := b.Min.Y + int((uint64(y)*uint64(b.Dy())+uint64(b.Dy()/2))/uint64(size.Y))
-	if NRGBA64At(s.mask, mx, my).R == 0 {
+	source := s.samplePoint(s.source.Bounds(), x, y)
+	pixel := NRGBA64At(s.source, source.X, source.Y)
+	mask := s.samplePoint(s.mask.Bounds(), x, y)
+	if NRGBA64At(s.mask, mask.X, mask.Y).R == 0 {
 		pixel.A = 0
 	}
 	return pixel

ofdgo_compression.go

@@ -130,12 +130,7 @@ func (e *Editor) outputSnapshot(ctx context.Context, options WriteOptions) (*Edi
 		return nil, err
 	}
 	snapshot := *e
-	snapshot.OnWriteProgress = func(stage string, completed, total int) error {
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		return editorProgress(e.OnWriteProgress).report(stage, completed, total)
-	}
+	snapshot.OnWriteProgress = editorProgress(e.OnWriteProgress).withContext(ctx)
 	snapshot.output = &outputOptimization{ctx: ctx, options: options.Compression}
 	if options.Compression.Mode == CompressionUnchanged {
 		return &snapshot, nil

ofdgo_compression_parallel.go

@@ -84,13 +84,16 @@ func (e *Editor) prepareOutputImages(keys []string, load func(string) ([]byte, e
 		if err := e.output.ctx.Err(); err != nil {
 			return err
 		}
-		if err := editorProgress(e.OnWriteProgress).report("compress", e.output.completed, 0); err != nil {
+		if err := editorProgress(e.OnWriteProgress).withContext(e.output.ctx).report("compress", e.output.completed, 0); err != nil {
 			return err
 		}
 		data, err := load(key)
 		if err != nil {
 			return err
 		}
+		if err := e.output.ctx.Err(); err != nil {
+			return err
+		}
 		if len(data) == 0 {
 			continue
 		}

ofdgo_convert.go

@@ -353,17 +353,21 @@ func Convert(ctx context.Context, source io.ReaderAt, size int64, output io.Writ
 	return report, err
 }
 
-// ReadAt 读取指定位置的数据并响应取消
+// ReadAt 读取前后响应取消，保留读取字节数和源错误
 // 入参: data 目标缓冲, offset 源偏移
 // 返回: int 读取字节数, error 读取错误
 func (r convertReader) ReadAt(data []byte, offset int64) (int, error) {
 	if err := r.context.Err(); err != nil {
 		return 0, err
 	}
-	return r.source.ReadAt(data, offset)
+	n, err := r.source.ReadAt(data, offset)
+	if err == nil {
+		err = r.context.Err()
+	}
+	return n, err
 }
 
-// Write 写出数据并响应取消及短写
+// Write 写入前后响应取消，保留写入及短写错误
 // 入参: data 待写数据
 // 返回: int 写入字节数, error 写入错误
 func (w convertWriter) Write(data []byte) (int, error) {
@@ -375,5 +379,26 @@ func (w convertWriter) Write(data []byte) (int, error) {
 	if err == nil && n != len(data) {
 		err = io.ErrShortWrite
 	}
+	if err == nil {
+		err = w.context.Err()
+	}
+	return n, err
+}
+
+// WriteString 写入字符串并保留底层原生写入能力，前后响应取消
+// 入参: data 待写文本
+// 返回: int 写入字节数, error 写入、短写或取消错误
+func (w convertWriter) WriteString(data string) (int, error) {
+	if err := w.context.Err(); err != nil {
+		return 0, err
+	}
+	n, err := io.WriteString(w.writer, data)
+	*w.count += int64(n)
+	if err == nil && n != len(data) {
+		err = io.ErrShortWrite
+	}
+	if err == nil {
+		err = w.context.Err()
+	}
 	return n, err
 }

ofdgo_pdf.go

@@ -151,10 +151,9 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 	if !finite(renderer.DPI) || renderer.DPI <= 0 {
 		return nil, PDFImportReport{}, fmt.Errorf("invalid PDF raster DPI")
 	}
-	if options.OnProgress != nil {
-		if err := options.OnProgress("open", 0, 0); err != nil {
-			return nil, PDFImportReport{}, err
-		}
+	progress := editorProgress(options.OnProgress).withContext(ctx)
+	if err := progress.report("open", 0, 0); err != nil {
+		return nil, PDFImportReport{}, err
 	}
 	editor := NewEditor()
 	editor.SetRenderBackends(renderer.Backends())
@@ -168,7 +167,7 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		readWarning = func(diagnostic pdfgo.Diagnostic) { diagnostics = append(diagnostics, diagnostic) }
 		readOptions.Warning = func(diagnostic pdfgo.Diagnostic) { readWarning(diagnostic) }
 	}
-	reader, err := pdfgo.NewReaderWithOptions(source, size, readOptions)
+	reader, err := pdfgo.NewReaderWithOptions(convertReader{context: ctx, source: source}, size, readOptions)
 	if err != nil {
 		return nil, PDFImportReport{}, err
 	}
@@ -206,10 +205,8 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		}
 		readWarning = importer.warning
 	}
-	if options.OnProgress != nil {
-		if err := options.OnProgress("pages", 0, 0); err != nil {
-			return nil, PDFImportReport{}, err
-		}
+	if err := progress.report("pages", 0, 0); err != nil {
+		return nil, PDFImportReport{}, err
 	}
 	err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
 		_, width, height := codecpdf.PageMatrix(page)
@@ -220,10 +217,7 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		importer.pageOrder = append(importer.pageOrder, page)
 		importer.pageIDs[page.Reference] = editor.pages[index].ID
 		importer.pageIndexes[page.Reference] = index
-		if options.OnProgress != nil {
-			return options.OnProgress("pages", index+1, 0)
-		}
-		return nil
+		return progress.report("pages", index+1, 0)
 	})
 	if err != nil {
 		return nil, PDFImportReport{}, err
@@ -241,10 +235,8 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		}
 		importer.page = 0
 	}
-	if options.OnProgress != nil {
-		if err := options.OnProgress("convert", 0, len(editor.pages)); err != nil {
-			return nil, PDFImportReport{}, err
-		}
+	if err := progress.report("convert", 0, len(editor.pages)); err != nil {
+		return nil, PDFImportReport{}, err
 	}
 	err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
 		matrix, width, height := codecpdf.PageMatrix(page)
@@ -284,13 +276,13 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 			return fmt.Errorf("import PDF page %d: %w", index+1, err)
 		}
 		importer.report.Pages++
-		if options.OnProgress != nil {
-			if err := options.OnProgress("convert", index+1, len(editor.pages)); err != nil {
-				return err
-			}
+		if err := progress.report("convert", index+1, len(editor.pages)); err != nil {
+			return err
 		}
 		if options.Progress != nil {
-			return options.Progress(index + 1)
+			if err := options.Progress(index + 1); err != nil {
+				return err
+			}
 		}
 		return ctx.Err()
 	})

ofdgo_pdf_composite_draw.go

@@ -231,6 +231,8 @@ func (c *pdfCompositor) drawPaint(node pdfCompositeNode, outline bool, paint pdf
 	}
 	var uniformValues [4]float64
 	var uniformPoint pdfgo.Point
+	uniformChannels := pdfTransferChannels
+	selectChannels := (c.channels != nil || transfer != nil && c.transferModel == "DeviceCMYK") && (compatible || marked != nil || patternChannels != nil)
 	uniformReady := false
 	var sampler *pdfCompositeColorSampler
 	if g := paint.Axial; (node.image == nil || node.image.Image.ImageMask) && shading == nil && g != nil && g.Bounds == nil && g.Background == nil {
@@ -259,8 +261,14 @@ func (c *pdfCompositor) drawPaint(node pdfCompositeNode, outline bool, paint pdf
 		if err := c.importer.ctx.Err(); err != nil {
 			return err
 		}
+		row := pdfCoverageRow(coverage, y, region.Min.X, region.Max.X)
 		for x := region.Min.X; x < region.Max.X; x++ {
-			a := baseimage.AlphaAt(coverage, x, y)
+			var a uint32
+			if row != nil {
+				a = uint32(row[4*(x-region.Min.X)+3]) * 257
+			} else {
+				a = baseimage.AlphaAt(coverage, x, y)
+			}
 			if a == 0 {
 				continue
 			}
@@ -325,6 +333,14 @@ func (c *pdfCompositor) drawPaint(node pdfCompositeNode, outline bool, paint pdf
 					} else {
 						uniformValues, _, err = codecpdf.CompositeColor(paint, pdfgo.Point{}, space, style.RenderingIntent, style.ColorConversion)
 					}
+					if selectChannels {
+						uniformChannels = 0
+						for j, selected := range codecpdf.PaintChannels(uniformValues, compatible, marked) {
+							if selected {
+								uniformChannels |= 1 << j
+							}
+						}
+					}
 					uniformReady = true
 				}
 				values = uniformValues
@@ -391,11 +407,15 @@ func (c *pdfCompositor) drawPaint(node pdfCompositeNode, outline bool, paint pdf
 			}
 			pixels[index].Shape += shape * (1 - pixels[index].Shape)
 			bits := pdfTransferChannels
-			if (c.channels != nil || transfer != nil && c.transferModel == "DeviceCMYK") && (compatible || marked != nil || patternChannels != nil) {
-				bits = 0
-				for j, selected := range codecpdf.PaintChannels(values, compatible, marked) {
-					if selected {
-						bits |= 1 << j
+			if selectChannels {
+				if uniformReady {
+					bits = uniformChannels
+				} else {
+					bits = 0
+					for j, selected := range codecpdf.PaintChannels(values, compatible, marked) {
+						if selected {
+							bits |= 1 << j
+						}
 					}
 				}
 				if patternChannels != nil {

ofdgo_pdf_composite_scratch.go

@@ -30,6 +30,18 @@ type pdfCompositeScratch struct {
 	rasters  [8]*image.RGBA
 }
 
+// pdfCoverageRow 读取完整范围内的原生覆盖行，其他类型沿用逐点采样
+// 入参: coverage 覆盖图像, y 行坐标, left 起始列, right 结束列
+// 返回: []byte RGBA像素或空值
+func pdfCoverageRow(coverage image.Image, y, left, right int) []byte {
+	buffer, ok := coverage.(*image.RGBA)
+	if !ok || y < buffer.Rect.Min.Y || y >= buffer.Rect.Max.Y || left < buffer.Rect.Min.X || right > buffer.Rect.Max.X || left >= right {
+		return nil
+	}
+	start := buffer.PixOffset(left, y)
+	return buffer.Pix[start : start+4*(right-left)]
+}
+
 // acquireCoverage 借用当前块的独占画布，保留活动画布供嵌套合成读取
 // 返回: *image.RGBA 未清空画布，不支持缓冲绘制的后端返回nil, error 无效绘制区域
 func (c *pdfCompositor) acquireCoverage() (*image.RGBA, error) {

ofdgo_pdf_shading.go

@@ -21,6 +21,7 @@ import (
 	"strconv"
 
 	basegeom "github.com/xiaoqidun/ofdgo/internal/base/geom"
+	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
 	codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
 	"github.com/xiaoqidun/pdfgo"
 )
@@ -612,7 +613,7 @@ func (c *pdfCompositor) gradient(paint pdfgo.Paint, space *pdfgo.ColorSpace, nod
 				for sx := range samples {
 					weight := 1.0
 					if coverage != nil {
-						_, _, _, a := coverage.At(x*samples+sx, y*samples+sy).RGBA()
+						a := baseimage.AlphaAt(coverage, x*samples+sx, y*samples+sy)
 						weight = float64(a) / 65535
 						if weight == 0 {
 							continue

ofdgo_raster.go

@@ -130,15 +130,14 @@ func (m RasterMatrix) Apply(p RasterPoint) RasterPoint {
 	return RasterPoint{m[0]*p.X + m[2]*p.Y + m[4], m[1]*p.X + m[3]*p.Y + m[5]}
 }
 
-// Inverse 求逆矩阵，退化或行列式非有限时返回错误
+// Inverse 求有限逆矩阵，复用几何变换的溢出、下溢及相消处理
 // 返回: RasterMatrix 逆矩阵, error 无效矩阵
 func (m RasterMatrix) Inverse() (RasterMatrix, error) {
-	det := m[0]*m[3] - m[1]*m[2]
-	if det == 0 || math.IsNaN(det) || math.IsInf(det, 0) {
+	inverse, ok := MatrixFromValues([6]float64(m)).Invert()
+	if !ok {
 		return RasterMatrix{}, fmt.Errorf("invalid raster transform")
 	}
-	return RasterMatrix{m[3] / det, -m[1] / det, -m[2] / det, m[0] / det,
-		(m[2]*m[5] - m[3]*m[4]) / det, (m[1]*m[4] - m[0]*m[5]) / det}, nil
+	return RasterMatrix(inverse.Values()), nil
 }
 
 // At 采样局部坐标下的渐变，使用预乘颜色插值

ofdgo_raster_clip.go

@@ -21,6 +21,8 @@ import (
 	"image"
 	"image/color"
 	"math"
+
+	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
 )
 
 // rasterClipKey 区分页面尺寸、分辨率和裁剪路径
@@ -102,9 +104,10 @@ func rasterClipMask(backend RasterBackend, page *RasterPage, path []RasterSegmen
 			return nil, err
 		}
 		for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
-			for x := bounds.Min.X; x < bounds.Max.X; x++ {
-				_, _, _, alpha := pixels.At(x-bounds.Min.X, y-bounds.Min.Y).RGBA()
-				mask.SetAlpha(x, y, color.Alpha{uint8(alpha >> 8)})
+			start := mask.PixOffset(bounds.Min.X, y)
+			row := mask.Pix[start : start+bounds.Dx()]
+			for x := range row {
+				row[x] = uint8(baseimage.AlphaAt(pixels, x, y-bounds.Min.Y) >> 8)
 			}
 		}
 	}

ofdgo_render_output.go

@@ -172,6 +172,8 @@ func (r *Renderer) RenderToText(page *PageContent, writer io.Writer) error {
 	if err != nil {
 		return err
 	}
+	var written int64
+	writer = convertWriter{context: ctx, writer: writer, count: &written}
 	_, err = text.WriteTo(writer)
 	if err != nil {
 		return err
@@ -201,6 +203,8 @@ func (r *Renderer) RenderToMultiPageText(writer io.Writer, indices ...int) error
 	if err := r.exportProgress(0, len(indices)); err != nil {
 		return err
 	}
+	var count int64
+	writer = convertWriter{context: ctx, writer: writer, count: &count}
 	written := false
 	for i, index := range indices {
 		text, err := r.PageTextByIndexContext(ctx, index)
@@ -235,11 +239,13 @@ func (r *Renderer) RenderToImage(page *PageContent) (image.Image, error) {
 
 // RenderToPNG 渲染为PNG，像素尺寸由DPI决定
 // 入参: page 页面内容, writer 输出流
-// 返回: error 错误信息
+// 返回: error 渲染、写入或取消错误
 func (r *Renderer) RenderToPNG(page *PageContent, writer io.Writer) error {
 	if err := r.Compression.Validate(); err != nil {
 		return err
 	}
+	var written int64
+	writer = convertWriter{context: r.outputContext(), writer: writer, count: &written}
 	img, err := r.RenderToImage(page)
 	if err != nil {
 		return err
@@ -262,11 +268,13 @@ func (r *Renderer) RenderToPNG(page *PageContent, writer io.Writer) error {
 
 // RenderToJPEG 渲染为白底JPEG，像素尺寸由DPI决定
 // 入参: page 页面内容, writer 输出流, options 编码选项，nil使用标准库默认值
-// 返回: error 错误信息
+// 返回: error 渲染、写入或取消错误
 func (r *Renderer) RenderToJPEG(page *PageContent, writer io.Writer, options *jpeg.Options) error {
 	if err := r.Compression.Validate(); err != nil {
 		return err
 	}
+	var written int64
+	writer = convertWriter{context: r.outputContext(), writer: writer, count: &written}
 	img, err := r.RenderToImage(page)
 	if err != nil {
 		return err
@@ -320,7 +328,7 @@ func (r *Renderer) RenderToPDF(page *PageContent, writer io.Writer) error {
 
 // RenderToEPS 渲染为EPS
 // 入参: page 页面内容, writer 输出流
-// 返回: error 错误信息
+// 返回: error 渲染、写入或取消错误
 func (r *Renderer) RenderToEPS(page *PageContent, writer io.Writer) error {
 	if err := r.Compression.Validate(); err != nil {
 		return err
@@ -328,6 +336,8 @@ func (r *Renderer) RenderToEPS(page *PageContent, writer io.Writer) error {
 	if r.backends.EPS == nil {
 		return fmt.Errorf("eps: %w", ErrBackendUnavailable)
 	}
+	var written int64
+	writer = convertWriter{context: r.outputContext(), writer: writer, count: &written}
 	return r.backends.EPS.RenderEPS(r, page, writer)
 }
 

ofdgo_render_svg.go

@@ -64,7 +64,7 @@ func (r *Renderer) RenderToSVGWithObjects(page *PageContent, writer io.Writer) (
 
 // renderSVG 将SVG输出及对象分组交给指定后端
 // 入参: page 页面内容, writer 输出流, mode 资源封装方式
-// 返回: SVGResources 字体和图片资源, error 输出错误
+// 返回: SVGResources 字体和图片资源, error 渲染、写入或取消错误
 func (r *Renderer) renderSVG(page *PageContent, writer io.Writer, mode SVGMode) (SVGResources, error) {
 	if err := r.Compression.Validate(); err != nil {
 		return SVGResources{}, err
@@ -72,5 +72,7 @@ func (r *Renderer) renderSVG(page *PageContent, writer io.Writer, mode SVGMode)
 	if r.backends.SVG == nil {
 		return SVGResources{}, fmt.Errorf("svg: %w", ErrBackendUnavailable)
 	}
+	var written int64
+	writer = convertWriter{context: r.outputContext(), writer: writer, count: &written}
 	return r.backends.SVG.RenderSVG(r, page, writer, mode)
 }

ofdgo_renderer_canvas.go

@@ -99,6 +99,7 @@ func (b CanvasBackend) renderImage(page *RasterPage, img *image.RGBA) (image.Ima
 	}
 	r := rasterizer.FromImage(img, canvas.DPMM(page.DPI/25.4), space)
 	masks := renderCache[[32]byte, *image.Alpha]{limit: 16 << 20}
+	var pathData []float64
 	for i, cmd := range page.Commands {
 		if cmd.Image != nil {
 			source, err := baseimage.PixelData(cmd.Image)
@@ -119,23 +120,11 @@ func (b CanvasBackend) renderImage(page *RasterPage, img *image.RGBA) (image.Ima
 			}
 			continue
 		}
-		p := &canvas.Path{}
-		for _, s := range cmd.Path {
-			switch s.Verb {
-			case RasterMove:
-				p.MoveTo(s.End.X, s.End.Y)
-			case RasterLine:
-				p.LineTo(s.End.X, s.End.Y)
-			case RasterQuad:
-				p.QuadTo(s.Control1.X, s.Control1.Y, s.End.X, s.End.Y)
-			case RasterCubic:
-				p.CubeTo(s.Control1.X, s.Control1.Y, s.Control2.X, s.Control2.Y, s.End.X, s.End.Y)
-			case RasterClose:
-				p.Close()
-			default:
-				return nil, fmt.Errorf("canvas command %d: unsupported path verb %d", i, s.Verb)
-			}
+		p, err := rasterCanvasPath(cmd.Path, pathData)
+		if err != nil {
+			return nil, fmt.Errorf("canvas command %d: %w", i, err)
 		}
+		pathData = p.Data()[:0]
 		paint := canvas.Paint{Color: cmd.Paint.Color}
 		var sampled rasterGradientCanvas
 		if g := cmd.Paint.Gradient; g != nil {
@@ -220,6 +209,44 @@ func (b CanvasBackend) renderImage(page *RasterPage, img *image.RGBA) (image.Ima
 	return img, nil
 }
 
+// rasterCanvasPath 预留路径容量，保留光栅指令的构建及闭合规则
+// 入参: path 只读光栅路径, buffer 可复用的独占路径缓冲
+// 返回: *canvas.Path 使用独占缓冲的绘制路径, error 不支持的指令
+func rasterCanvasPath(path []RasterSegment, buffer []float64) (*canvas.Path, error) {
+	capacity := 0
+	for _, segment := range path {
+		switch segment.Verb {
+		case RasterQuad:
+			capacity += 6
+		case RasterCubic:
+			capacity += 8
+		default:
+			capacity += 4
+		}
+	}
+	if cap(buffer) < capacity {
+		buffer = make([]float64, 0, capacity)
+	}
+	p := canvas.NewPathFromData(buffer[:0])
+	for _, s := range path {
+		switch s.Verb {
+		case RasterMove:
+			p.MoveTo(s.End.X, s.End.Y)
+		case RasterLine:
+			p.LineTo(s.End.X, s.End.Y)
+		case RasterQuad:
+			p.QuadTo(s.Control1.X, s.Control1.Y, s.End.X, s.End.Y)
+		case RasterCubic:
+			p.CubeTo(s.Control1.X, s.Control1.Y, s.Control2.X, s.Control2.Y, s.End.X, s.End.Y)
+		case RasterClose:
+			p.Close()
+		default:
+			return nil, fmt.Errorf("unsupported path verb %d", s.Verb)
+		}
+	}
+	return p, nil
+}
+
 // At 返回原局部坐标的描边渐变颜色
 // 入参: x 页面横坐标, y 页面纵坐标
 // 返回: color.RGBA 预乘颜色

ofdgo_renderer_eps_compression.go

@@ -63,21 +63,39 @@ func (r *epsImageRenderer) RenderImage(img image.Image, matrix canvas.Matrix) {
 	var encoded bytes.Buffer
 	compressor, _ := zlib.NewWriterLevel(&encoded, zlib.BestCompression)
 	opaque := true
+	native, _ := img.(image.RGBA64Image)
 	for y := 0; y < height; y++ {
 		if r.err = r.ctx.Err(); r.err != nil {
 			return
 		}
 		clear(pixels)
 		for x := 0; x < width; x++ {
-			red, green, blue, alpha := img.At(bounds.Min.X+x, bounds.Min.Y+y).RGBA()
+			if x&4095 == 0 {
+				if r.err = r.ctx.Err(); r.err != nil {
+					return
+				}
+			}
+			var red, green, blue, alpha uint32
+			if native != nil {
+				pixel := native.RGBA64At(bounds.Min.X+x, bounds.Min.Y+y)
+				red, green, blue, alpha = uint32(pixel.R), uint32(pixel.G), uint32(pixel.B), uint32(pixel.A)
+			} else {
+				red, green, blue, alpha = img.At(bounds.Min.X+x, bounds.Min.Y+y).RGBA()
+			}
 			if alpha != 65535 {
 				opaque = false
 			}
-			if alpha != 0 {
+			if alpha == 65535 {
+				offset := x * 3
+				pixels[offset], pixels[offset+1], pixels[offset+2] = byte(red>>8), byte(green>>8), byte(blue>>8)
+			} else if alpha != 0 {
 				offset := x * 3
 				pixels[offset], pixels[offset+1], pixels[offset+2] = byte(red*65535/alpha>>8), byte(green*65535/alpha>>8), byte(blue*65535/alpha>>8)
 			}
 		}
+		if r.err = r.ctx.Err(); r.err != nil {
+			return
+		}
 		if _, r.err = compressor.Write(pixels); r.err != nil {
 			return
 		}
@@ -101,6 +119,9 @@ func (r *epsImageRenderer) RenderImage(img image.Image, matrix canvas.Matrix) {
 			data, filter = optimized, "DCTDecode"
 		}
 	}
+	if r.err = r.ctx.Err(); r.err != nil {
+		return
+	}
 	m := matrix.Scale(float64(width), float64(height))
 	_, r.err = fmt.Fprintf(r.writer, " gsave /DeviceRGB setcolorspace [%s %s %s %s %s %s] concat <</ImageType 1 /BitsPerComponent 8 /Decode [0 1 0 1 0 1] /Interpolate true /Width %d /Height %d /ImageMatrix [%d 0 0 -%d 0 %d] /DataSource currentfile /ASCII85Decode filter /%s filter>>image\n", ofdNumber(m[0][0]), ofdNumber(m[1][0]), ofdNumber(m[0][1]), ofdNumber(m[1][1]), ofdNumber(m[0][2]), ofdNumber(m[1][2]), width, height, width, height, height, filter)
 	if r.err != nil {

ofdgo_renderer_image_canvas.go

@@ -267,6 +267,7 @@ func (r *Renderer) imageWithClip(img image.Image, clipPath *canvas.Path, m canva
 	}
 	if baseimage.HighPrecision(img) || baseimage.HighPrecision(result) {
 		out := image.NewNRGBA64(bounds)
+		source64, _ := img.(*image.NRGBA64)
 		maskBounds := result.Bounds()
 		opaque := true
 		for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
@@ -274,6 +275,11 @@ func (r *Renderer) imageWithClip(img image.Image, clipPath *canvas.Path, m canva
 				r.renderError = err
 				return img
 			}
+			row := out.Pix[(y-bounds.Min.Y)*out.Stride:][:w*8]
+			if source64 != nil {
+				start := source64.PixOffset(bounds.Min.X, y)
+				copy(row, source64.Pix[start:start+len(row)])
+			}
 			for x := bounds.Min.X; x < bounds.Max.X; x++ {
 				if (x-bounds.Min.X)&255 == 0 {
 					if err := work.Err(); err != nil {
@@ -281,9 +287,15 @@ func (r *Renderer) imageWithClip(img image.Image, clipPath *canvas.Path, m canva
 						return img
 					}
 				}
-				pixel := baseimage.NRGBA64At(img, x, y)
 				alpha := baseimage.AlphaAt(result, maskBounds.Min.X+x-bounds.Min.X, maskBounds.Min.Y+y-bounds.Min.Y)
 				opaque = opaque && alpha == 65535
+				if source64 != nil {
+					i := (x-bounds.Min.X)*8 + 6
+					a := (uint32(row[i])<<8 | uint32(row[i+1])) * alpha / 65535
+					row[i], row[i+1] = byte(a>>8), byte(a)
+					continue
+				}
+				pixel := baseimage.NRGBA64At(img, x, y)
 				pixel.A = uint16(uint32(pixel.A) * alpha / 65535)
 				out.SetNRGBA64(x, y, pixel)
 			}