feat(渲染能力): 完善底纹填充、描边及基础颜色空间支持

ofdgo_object.go

@@ -19,6 +19,30 @@ import (
 	"strconv"
 )
 
+// UnmarshalXML 解析填充颜色并区分未支持的复杂颜色
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (c *FillColor) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type plain FillColor
+	var value struct {
+		plain
+		Other *struct{} `xml:",any"`
+	}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*c = FillColor(value.plain)
+	c.unsupported = value.Other != nil
+	return nil
+}
+
+// UnmarshalXML 解析勾边颜色并区分未支持的复杂颜色
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (c *StrokeColor) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	return (*FillColor)(c).UnmarshalXML(d, start)
+}
+
 // graphicObjectTarget 图形对象集合
 type graphicObjectTarget struct {
 	objects   *[]GraphicObject

ofdgo_page.go

@@ -22,6 +22,7 @@ type PageContent struct {
 	ID       string     `xml:"-"`
 	Area     PageArea   `xml:"Area"`
 	Template []Template `xml:"Template"`
+	PageRes  string     `xml:"PageRes"`
 	Content  Content    `xml:"Content"`
 	Actions  []Action   `xml:"Actions>Action"`
 }
@@ -106,10 +107,13 @@ type TextObject struct {
 // FillColor 填充颜色
 type FillColor struct {
 	Value       string     `xml:"Value,attr"`
+	Index       *int       `xml:"Index,attr"`
+	ColorSpace  string     `xml:"ColorSpace,attr"`
 	Alpha       *int       `xml:"Alpha,attr"`
 	Pattern     *Pattern   `xml:"Pattern"`
 	AxialShd    *AxialShd  `xml:"AxialShd"`
 	RadialShd   *RadialShd `xml:"RadialShd"`
+	unsupported bool
 }
 
 // Pattern 图案填充
@@ -119,6 +123,7 @@ type Pattern struct {
 	XStep         float64        `xml:"XStep,attr"`
 	YStep         float64        `xml:"YStep,attr"`
 	ReflectMethod string         `xml:"ReflectMethod,attr"`
+	RelativeTo    string         `xml:"RelativeTo,attr"`
 	CTM           string         `xml:"CTM,attr"`
 	CellContent   PatternContent `xml:"CellContent"`
 }
@@ -175,12 +180,7 @@ type PathObject struct {
 }
 
 // StrokeColor 勾边颜色
-type StrokeColor struct {
-	Value     string     `xml:"Value,attr"`
-	Alpha     *int       `xml:"Alpha,attr"`
-	AxialShd  *AxialShd  `xml:"AxialShd"`
-	RadialShd *RadialShd `xml:"RadialShd"`
-}
+type StrokeColor FillColor
 
 // AxialShd 轴向渐变
 type AxialShd struct {
@@ -216,6 +216,8 @@ type ShdSegment struct {
 // ShdColor 渐变颜色
 type ShdColor struct {
 	Value      string `xml:"Value,attr"`
+	Index      *int   `xml:"Index,attr"`
+	ColorSpace string `xml:"ColorSpace,attr"`
 	Alpha      *int   `xml:"Alpha,attr"`
 }
 

ofdgo_paint.go

@@ -24,40 +24,66 @@ import (
 )
 
 // parseColorWithAlpha 解析带透明度的颜色
-// 入参: val 颜色值, alpha 透明度
+// 入参: value 颜色值, index 调色板索引, space 颜色空间标识, alpha 透明度
 // 返回: color.Color 颜色对象
-func parseColorWithAlpha(val string, alpha *int) color.Color {
-	parts := strings.Fields(val)
-	if len(parts) >= 3 {
-		r := parseColorComponent(parts[0])
-		g := parseColorComponent(parts[1])
-		b := parseColorComponent(parts[2])
+func (r *Renderer) parseColorWithAlpha(value string, index *int, space string, alpha *int) color.Color {
+	if space == "" && r.Reader.doc != nil {
+		space = strconv.Itoa(r.Reader.doc.CommonData.DefaultCS)
+	}
+	cs := r.Reader.colorSpaceCache[space]
+	kind, bits, count := "RGB", 8, 3
+	if cs != nil {
+		kind = cs.Type
+		switch cs.BitsPerComponent {
+		case 1, 2, 4, 8, 16:
+			bits = cs.BitsPerComponent
+		}
+		if strings.TrimSpace(value) == "" && index != nil && 0 <= *index && *index < len(cs.Palette) {
+			value = cs.Palette[*index]
+		}
+	}
+	switch kind {
+	case "GRAY":
+		count = 1
+	case "CMYK":
+		count = 4
+	}
+	parts := strings.Fields(value)
+	var components [4]uint8
+	limit := 1<<bits - 1
+	if len(parts) >= count {
+		for i, part := range parts[:count] {
+			v, err := parseColorComponent(part)
+			if err != nil || v < 0 || limit < v {
+				components = [4]uint8{}
+				break
+			}
+			components[i] = uint8((v*255 + limit/2) / limit)
+		}
+	}
+	red, green, blue := components[0], components[1], components[2]
+	switch kind {
+	case "GRAY":
+		green, blue = red, red
+	case "CMYK":
+		red, green, blue = color.CMYKToRGB(components[0], components[1], components[2], components[3])
+	}
 	a := 255
 	if alpha != nil {
-			a = *alpha
+		a = clampColor(*alpha)
 	}
-		a = clampColor(a)
-		return color.RGBA{
-			R: uint8(clampColor(r) * a / 255),
-			G: uint8(clampColor(g) * a / 255),
-			B: uint8(clampColor(b) * a / 255),
-			A: uint8(a),
-		}
-	}
-	return color.Black
+	return color.RGBA{R: uint8(int(red) * a / 255), G: uint8(int(green) * a / 255), B: uint8(int(blue) * a / 255), A: uint8(a)}
 }
 
 // parseColorComponent 解析颜色分量
 // 入参: s 颜色分量
-// 返回: int 颜色分量值
-func parseColorComponent(s string) int {
-	s = strings.TrimSpace(s)
+// 返回: int 颜色分量值, error 错误信息
+func parseColorComponent(s string) (int, error) {
 	if strings.HasPrefix(s, "#") {
-		v, _ := strconv.ParseInt(strings.TrimPrefix(s, "#"), 16, 0)
-		return int(v)
+		v, err := strconv.ParseInt(s[1:], 16, 0)
+		return int(v), err
 	}
-	v, _ := strconv.Atoi(s)
-	return v
+	return strconv.Atoi(s)
 }
 
 // clampColor 限制颜色分量范围
@@ -135,7 +161,7 @@ func colorWithAlpha(c color.Color, alpha *int) color.Color {
 // parseFillColor 解析填充颜色
 // 入参: fillColor 填充颜色节点
 // 返回: color.Color 颜色对象
-func parseFillColor(fillColor *FillColor) color.Color {
+func (r *Renderer) parseFillColor(fillColor *FillColor) color.Color {
 	if fillColor == nil {
 		return nil
 	}
@@ -143,117 +169,81 @@ func parseFillColor(fillColor *FillColor) color.Color {
 		return nil
 	}
 	if fillColor.AxialShd != nil {
-		return parseShdColor(fillColor.AxialShd.Segment, fillColor.Alpha)
+		return r.parseShdColor(fillColor.AxialShd.Segment, fillColor.Alpha)
 	}
 	if fillColor.RadialShd != nil {
-		return parseShdColor(fillColor.RadialShd.Segment, fillColor.Alpha)
-	}
-	if strings.TrimSpace(fillColor.Value) != "" {
-		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+		return r.parseShdColor(fillColor.RadialShd.Segment, fillColor.Alpha)
 	}
+	if fillColor.unsupported && strings.TrimSpace(fillColor.Value) == "" && fillColor.Index == nil {
 		return nil
+	}
+	return r.parseColorWithAlpha(fillColor.Value, fillColor.Index, fillColor.ColorSpace, fillColor.Alpha)
 }
 
 // parseFillPaint 解析填充画刷
 // 入参: fillColor 填充颜色节点, x X坐标, y Y坐标, pageH 页面高度
 // 返回: any 填充画刷
-func parseFillPaint(fillColor *FillColor, x, y, pageH float64) any {
+func (r *Renderer) parseFillPaint(fillColor *FillColor, x, y, pageH float64) any {
 	if fillColor == nil {
 		return nil
 	}
 	if fillColor.Pattern != nil {
 		return nil
 	}
-	if gradient := parseAxialShdGradient(fillColor.AxialShd, fillColor.Alpha, x, y, pageH); gradient != nil {
+	if gradient := r.parseAxialShdGradient(fillColor.AxialShd, fillColor.Alpha, x, y, pageH); gradient != nil {
 		return newShdPaint(gradient, fillColor.AxialShd.Extend, fillColor.AxialShd.MapType, fillColor.AxialShd.MapUnit)
 	}
-	if paint := parseRadialShdPaint(fillColor.RadialShd, fillColor.Alpha, x, y, pageH); paint != nil {
+	if paint := r.parseRadialShdPaint(fillColor.RadialShd, fillColor.Alpha, x, y, pageH); paint != nil {
 		return paint
 	}
-	if fillColor.AxialShd != nil {
-		return parseShdColor(fillColor.AxialShd.Segment, fillColor.Alpha)
-	}
-	if fillColor.RadialShd != nil {
-		return parseShdColor(fillColor.RadialShd.Segment, fillColor.Alpha)
-	}
-	if strings.TrimSpace(fillColor.Value) != "" {
-		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
-	}
-	return nil
+	return r.parseFillColor(fillColor)
 }
 
 // parseStrokeColor 解析勾边颜色
 // 入参: strokeColor 勾边颜色节点
 // 返回: color.Color 颜色对象
-func parseStrokeColor(strokeColor *StrokeColor) color.Color {
-	if strokeColor == nil {
-		return nil
-	}
-	if strokeColor.AxialShd != nil {
-		return parseShdColor(strokeColor.AxialShd.Segment, strokeColor.Alpha)
-	}
-	if strokeColor.RadialShd != nil {
-		return parseShdColor(strokeColor.RadialShd.Segment, strokeColor.Alpha)
-	}
-	if strings.TrimSpace(strokeColor.Value) != "" {
-		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
-	}
-	return nil
+func (r *Renderer) parseStrokeColor(strokeColor *StrokeColor) color.Color {
+	return r.parseFillColor((*FillColor)(strokeColor))
 }
 
 // parseStrokePaint 解析勾边画刷
 // 入参: strokeColor 勾边颜色节点, x X坐标, y Y坐标, pageH 页面高度
 // 返回: any 勾边画刷
-func parseStrokePaint(strokeColor *StrokeColor, x, y, pageH float64) any {
-	if strokeColor == nil {
-		return nil
-	}
-	if gradient := parseAxialShdGradient(strokeColor.AxialShd, strokeColor.Alpha, x, y, pageH); gradient != nil {
-		return newShdPaint(gradient, strokeColor.AxialShd.Extend, strokeColor.AxialShd.MapType, strokeColor.AxialShd.MapUnit)
-	}
-	if paint := parseRadialShdPaint(strokeColor.RadialShd, strokeColor.Alpha, x, y, pageH); paint != nil {
-		return paint
-	}
-	if strokeColor.AxialShd != nil {
-		return parseShdColor(strokeColor.AxialShd.Segment, strokeColor.Alpha)
-	}
-	if strokeColor.RadialShd != nil {
-		return parseShdColor(strokeColor.RadialShd.Segment, strokeColor.Alpha)
-	}
-	if strings.TrimSpace(strokeColor.Value) != "" {
-		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
-	}
-	return nil
+func (r *Renderer) parseStrokePaint(strokeColor *StrokeColor, x, y, pageH float64) any {
+	return r.parseFillPaint((*FillColor)(strokeColor), x, y, pageH)
 }
 
-// patternColor 获取图案单元默认颜色
-// 入参: fillColor 填充颜色节点
-// 返回: color.Color 默认颜色
-func patternColor(fillColor *FillColor) color.Color {
-	if fillColor == nil || strings.TrimSpace(fillColor.Value) == "" {
+type patternPaint struct {
+	*Pattern
+	color color.Color
+	alpha *int
+}
+
+// parsePatternPaint 解析底纹画刷
+// 入参: pattern 底纹对象, value 颜色值, index 调色板索引, space 颜色空间标识, alpha 透明度
+// 返回: *patternPaint 底纹画刷
+func (r *Renderer) parsePatternPaint(pattern *Pattern, value string, index *int, space string, alpha *int) *patternPaint {
+	if pattern == nil {
 		return nil
 	}
-	return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+	return &patternPaint{Pattern: pattern, color: r.parseColorWithAlpha(value, index, space, nil), alpha: alpha}
 }
 
 // parseShdColor 解析渐变颜色
 // 入参: segments 渐变分段, alpha 透明度
 // 返回: color.Color 颜色对象
-func parseShdColor(segments []ShdSegment, alpha *int) color.Color {
-	for _, segment := range segments {
-		if strings.TrimSpace(segment.Color.Value) == "" {
-			continue
-		}
-		segmentAlpha := mergeAlpha(segment.Color.Alpha, alpha)
-		return parseColorWithAlpha(segment.Color.Value, segmentAlpha)
-	}
+func (r *Renderer) parseShdColor(segments []ShdSegment, alpha *int) color.Color {
+	if len(segments) == 0 {
 		return color.Black
+	}
+	c := segments[0].Color
+	return r.parseColorWithAlpha(c.Value, c.Index, c.ColorSpace, mergeAlpha(c.Alpha, alpha))
 }
 
 // parseShdSegments 解析渐变分段
 // 入参: segments 渐变分段, alpha 透明度
 // 返回: canvas.Grad 渐变分段
-func parseShdSegments(segments []ShdSegment, alpha *int) canvas.Grad {
+func (r *Renderer) parseShdSegments(segments []ShdSegment, alpha *int) canvas.Grad {
 	gradient := canvas.NewGradient()
 	position, step := 0.0, 0.0
 	for i, segment := range segments {
@@ -275,11 +265,8 @@ func parseShdSegments(segments []ShdSegment, alpha *int) canvas.Grad {
 		}
 		offset := position
 		position += step
-		if strings.TrimSpace(segment.Color.Value) == "" {
-			continue
-		}
 		segmentAlpha := mergeAlpha(segment.Color.Alpha, alpha)
-		gradient.Add(offset, colorToRGBA(parseColorWithAlpha(segment.Color.Value, segmentAlpha)))
+		gradient.Add(offset, colorToRGBA(r.parseColorWithAlpha(segment.Color.Value, segment.Color.Index, segment.Color.ColorSpace, segmentAlpha)))
 	}
 	if len(gradient) == 0 {
 		return nil
@@ -290,7 +277,7 @@ func parseShdSegments(segments []ShdSegment, alpha *int) canvas.Grad {
 // parseAxialShdGradient 解析轴向渐变
 // 入参: axialShd 轴向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度
 // 返回: canvas.Gradient 渐变对象
-func parseAxialShdGradient(axialShd *AxialShd, alpha *int, x, y, pageH float64) canvas.Gradient {
+func (r *Renderer) parseAxialShdGradient(axialShd *AxialShd, alpha *int, x, y, pageH float64) canvas.Gradient {
 	if axialShd == nil {
 		return nil
 	}
@@ -299,7 +286,7 @@ func parseAxialShdGradient(axialShd *AxialShd, alpha *int, x, y, pageH float64)
 	if len(start) < 2 || len(end) < 2 {
 		return nil
 	}
-	gradient := parseShdSegments(axialShd.Segment, alpha)
+	gradient := r.parseShdSegments(axialShd.Segment, alpha)
 	if gradient == nil {
 		return nil
 	}
@@ -342,7 +329,7 @@ func axialShdClip(ctx *canvas.Context, gradient *canvas.LinearGradient, extend i
 // parseRadialShdPaint 解析径向渐变画刷
 // 入参: radialShd 径向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度
 // 返回: *shdPaint 渐变画刷
-func parseRadialShdPaint(radialShd *RadialShd, alpha *int, x, y, pageH float64) *shdPaint {
+func (r *Renderer) parseRadialShdPaint(radialShd *RadialShd, alpha *int, x, y, pageH float64) *shdPaint {
 	if radialShd == nil || radialShd.EndRadius <= 0 {
 		return nil
 	}
@@ -351,7 +338,7 @@ func parseRadialShdPaint(radialShd *RadialShd, alpha *int, x, y, pageH float64)
 	if len(start) < 2 || len(end) < 2 {
 		return nil
 	}
-	gradient := parseShdSegments(radialShd.Segment, alpha)
+	gradient := r.parseShdSegments(radialShd.Segment, alpha)
 	if gradient == nil {
 		return nil
 	}

ofdgo_reader.go

@@ -32,6 +32,7 @@ type Reader struct {
 	RootDir                   string
 	ResMap                    map[string]string
 	fontCache                 map[string]*Font
+	colorSpaceCache           map[string]*ColorSpace
 	drawParamCache            map[string]*DrawParam
 	compositeGraphicUnitCache map[string]*CompositeGraphicUnit
 	doc                       *Document
@@ -74,6 +75,7 @@ func (r *Reader) initRoot() error {
 	r.OFD = &ofd
 	r.ResMap = make(map[string]string)
 	r.fontCache = make(map[string]*Font)
+	r.colorSpaceCache = make(map[string]*ColorSpace)
 	r.drawParamCache = make(map[string]*DrawParam)
 	r.compositeGraphicUnitCache = make(map[string]*CompositeGraphicUnit)
 	return nil
@@ -186,6 +188,10 @@ func (r *Reader) loadRes(resPath string) {
 		return
 	}
 	baseLoc := res.BaseLoc
+	for i := range res.ColorSpaces.ColorSpace {
+		cs := &res.ColorSpaces.ColorSpace[i]
+		r.colorSpaceCache[cs.ID] = cs
+	}
 	for _, mm := range res.MultiMedias.MultiMedia {
 		if mm.MediaFile != "" {
 			if finalPath := resolveResourcePath(resPath, baseLoc, mm.MediaFile); finalPath != "" {
@@ -245,6 +251,9 @@ func (r *Reader) PageContent(page Page) (*PageContent, error) {
 		return nil, fmt.Errorf("failed to unmarshal page content: %w", err)
 	}
 	content.ID = page.ID
+	if content.PageRes != "" {
+		r.loadRes(resolveResourcePath(page.BaseLoc, "", content.PageRes))
+	}
 	return &content, nil
 }
 

ofdgo_renderer_layer.go

@@ -194,10 +194,10 @@ func (r *Renderer) drawParamDefaults(id string, defaultFill, defaultStroke color
 		defaultLW = dp.LineWidth
 	}
 	if dp.FillColor != nil {
-		defaultFill = parseFillColor(dp.FillColor)
+		defaultFill = r.parseFillColor(dp.FillColor)
 	}
 	if dp.StrokeColor != nil {
-		defaultStroke = parseStrokeColor(dp.StrokeColor)
+		defaultStroke = r.parseStrokeColor(dp.StrokeColor)
 	}
 	return defaultFill, defaultStroke, defaultLW
 }

ofdgo_renderer_path.go

@@ -30,8 +30,8 @@ type pathStyle struct {
 	strokeColor   color.Color
 	fillPaint     any
 	strokePaint   any
-	fillPattern      *Pattern
-	fillPatternColor color.Color
+	fillPattern   *patternPaint
+	strokePattern *patternPaint
 	lineWidth     float64
 	lineCap       canvas.Capper
 	lineJoin      canvas.Joiner
@@ -59,21 +59,21 @@ func newPathStyle(defaultFill, defaultStroke color.Color, defaultLW float64, alp
 }
 
 // applyFillColor 应用填充颜色
-// 入参: fill 填充颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
-func (s *pathStyle) applyFillColor(fill *FillColor, bx, by, pageH float64, alpha *int) {
+// 入参: r 渲染器, fill 填充颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyFillColor(r *Renderer, fill *FillColor, bx, by, pageH float64, alpha *int) {
 	fillColorNode := withFillAlpha(fill, alpha)
-	s.fillPattern = fillColorNode.Pattern
-	s.fillPatternColor = patternColor(fillColorNode)
-	s.fillColor = parseFillColor(fillColorNode)
-	s.fillPaint = parseFillPaint(fillColorNode, bx, by, pageH)
+	s.fillPattern = r.parsePatternPaint(fillColorNode.Pattern, fillColorNode.Value, fillColorNode.Index, fillColorNode.ColorSpace, fillColorNode.Alpha)
+	s.fillColor = r.parseFillColor(fillColorNode)
+	s.fillPaint = r.parseFillPaint(fillColorNode, bx, by, pageH)
 }
 
 // applyStrokeColor 应用描边颜色
-// 入参: stroke 描边颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
-func (s *pathStyle) applyStrokeColor(stroke *StrokeColor, bx, by, pageH float64, alpha *int) {
+// 入参: r 渲染器, stroke 描边颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyStrokeColor(r *Renderer, stroke *StrokeColor, bx, by, pageH float64, alpha *int) {
 	strokeColorNode := withStrokeAlpha(stroke, alpha)
-	s.strokeColor = parseStrokeColor(strokeColorNode)
-	s.strokePaint = parseStrokePaint(strokeColorNode, bx, by, pageH)
+	s.strokePattern = r.parsePatternPaint(strokeColorNode.Pattern, strokeColorNode.Value, strokeColorNode.Index, strokeColorNode.ColorSpace, strokeColorNode.Alpha)
+	s.strokeColor = r.parseStrokeColor(strokeColorNode)
+	s.strokePaint = r.parseStrokePaint(strokeColorNode, bx, by, pageH)
 }
 
 // pathLineCap 转换线帽样式
@@ -103,16 +103,16 @@ func pathLineJoin(join string, fallback canvas.Joiner) canvas.Joiner {
 }
 
 // applyDrawParam 应用绘制参数样式
-// 入参: dp 绘制参数, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
-func (s *pathStyle) applyDrawParam(dp *DrawParam, bx, by, pageH float64, alpha *int) {
+// 入参: r 渲染器, dp 绘制参数, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyDrawParam(r *Renderer, dp *DrawParam, bx, by, pageH float64, alpha *int) {
 	if dp.LineWidth > 0 {
 		s.lineWidth = dp.LineWidth
 	}
 	if dp.FillColor != nil {
-		s.applyFillColor(dp.FillColor, bx, by, pageH, alpha)
+		s.applyFillColor(r, dp.FillColor, bx, by, pageH, alpha)
 	}
 	if dp.StrokeColor != nil {
-		s.applyStrokeColor(dp.StrokeColor, bx, by, pageH, alpha)
+		s.applyStrokeColor(r, dp.StrokeColor, bx, by, pageH, alpha)
 	}
 	if dp.Cap != "" {
 		s.lineCap = pathLineCap(dp.Cap, s.lineCap)
@@ -127,16 +127,16 @@ func (s *pathStyle) applyDrawParam(dp *DrawParam, bx, by, pageH float64, alpha *
 }
 
 // applyPathObject 应用路径对象样式
-// 入参: obj 路径对象, bx 边界X坐标, by 边界Y坐标, pageH 页面高度
-func (s *pathStyle) applyPathObject(obj PathObject, bx, by, pageH float64) {
+// 入参: r 渲染器, obj 路径对象, bx 边界X坐标, by 边界Y坐标, pageH 页面高度
+func (s *pathStyle) applyPathObject(r *Renderer, obj PathObject, bx, by, pageH float64) {
 	if obj.LineWidth > 0 {
 		s.lineWidth = obj.LineWidth
 	}
 	if obj.FillColor != nil {
-		s.applyFillColor(obj.FillColor, bx, by, pageH, obj.Alpha)
+		s.applyFillColor(r, obj.FillColor, bx, by, pageH, obj.Alpha)
 	}
 	if obj.StrokeColor != nil {
-		s.applyStrokeColor(obj.StrokeColor, bx, by, pageH, obj.Alpha)
+		s.applyStrokeColor(r, obj.StrokeColor, bx, by, pageH, obj.Alpha)
 	}
 	if obj.Cap != "" {
 		s.lineCap = pathLineCap(obj.Cap, canvas.ButtCap)
@@ -183,11 +183,15 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 	style := newPathStyle(defaultFill, defaultStroke, defaultLW, obj.Alpha)
 	if obj.DrawParam != "" {
 		if dp := r.getDrawParam(obj.DrawParam, nil); dp != nil {
-			style.applyDrawParam(dp, bx, by, pageH, obj.Alpha)
+			style.applyDrawParam(r, dp, bx, by, pageH, obj.Alpha)
 		}
 	}
-	style.applyPathObject(obj, bx, by, pageH)
+	style.applyPathObject(r, obj, bx, by, pageH)
 	style.scale(ctm)
+	patternCTM := TranslationMatrix(bx, by).Multiply(ctm)
+	if boundaryInCTM && parentCTM != nil {
+		patternCTM = parentCTM.Multiply(TranslationMatrix(bx, by)).Multiply(localCTM)
+	}
 	pathCTM := ctm
 	if boundaryInCTM {
 		pathCTM = localCTM
@@ -227,7 +231,7 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 			fp = applyClipPath(fp, fillClip)
 		}
 		if style.fillPattern != nil {
-			r.renderPattern(ctx, style.fillPattern, style.fillPatternColor, pageH, fp, ctm, bx, by)
+			r.renderPattern(ctx, style.fillPattern, pageH, fp, patternCTM)
 		} else if style.fillPaint != nil {
 			ctx.SetFillRule(fillRule)
 			ctx.SetFill(fillPaint)
@@ -259,13 +263,17 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 			ctx.SetDashes(0)
 		}
 		strokeClip := intersectClipPath(clipPath, shadingClip)
-		if strokeClip != nil || strokeView != canvas.Identity {
+		if strokeClip != nil || strokeView != canvas.Identity || style.strokePattern != nil {
 			sp = sp.Copy()
 			sp = sp.Stroke(style.lineWidth, style.lineCap, style.lineJoin, canvas.Tolerance)
 			sp = applyClipPath(sp, strokeClip)
+			if style.strokePattern != nil {
+				r.renderPattern(ctx, style.strokePattern, pageH, sp, patternCTM)
+			} else {
 				ctx.SetFill(strokePaint)
 				ctx.SetStrokeColor(canvas.Transparent)
 				drawShdPath(ctx, sp, strokeView)
+			}
 		} else {
 			ctx.DrawPath(0, 0, sp)
 		}
@@ -274,22 +282,25 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 }
 
 // renderPattern 渲染图案填充
-// 入参: ctx 画布上下文, pattern 图案对象, defaultColor 默认颜色, pageH 页面高度, clip 填充区域, parentCTM 父级CTM, bx 边界X坐标, by 边界Y坐标
-func (r *Renderer) renderPattern(ctx *canvas.Context, pattern *Pattern, defaultColor color.Color, pageH float64, clip *canvas.Path, parentCTM Matrix, bx, by float64) {
-	if pattern == nil || clip == nil || len(pattern.CellContent.Objects) == 0 {
+// 入参: ctx 画布上下文, pattern 底纹画刷, pageH 页面高度, clip 绘制区域, objectCTM 对象变换矩阵
+func (r *Renderer) renderPattern(ctx *canvas.Context, pattern *patternPaint, pageH float64, clip *canvas.Path, objectCTM Matrix) {
+	if clip == nil || clip.Empty() || len(pattern.CellContent.Objects) == 0 {
 		return
 	}
 	xStep, yStep := pattern.XStep, pattern.YStep
-	if xStep == 0 {
+	if xStep < pattern.Width {
 		xStep = pattern.Width
 	}
-	if yStep == 0 {
+	if yStep < pattern.Height {
 		yStep = pattern.Height
 	}
 	if xStep <= 0 || yStep <= 0 {
 		return
 	}
-	patternCTM := TranslationMatrix(bx, by).Multiply(parentCTM).Multiply(NewMatrix(pattern.CTM))
+	patternCTM := NewMatrix(pattern.CTM)
+	if pattern.RelativeTo != "Page" {
+		patternCTM = objectCTM.Multiply(patternCTM)
+	}
 	invCTM, ok := patternCTM.Invert()
 	if !ok {
 		return
@@ -329,7 +340,8 @@ func (r *Renderer) renderPattern(ctx *canvas.Context, pattern *Pattern, defaultC
 				tileCTM = tileCTM.Multiply(Matrix{a: 1, d: -1, f: pattern.Height})
 			}
 			for _, obj := range pattern.CellContent.Objects {
-				r.renderObject(ctx, obj, pageH, defaultColor, defaultColor, 0, &tileCTM, true, clip)
+				obj = mergeGraphicObjectAlpha(obj, pattern.alpha)
+				r.renderObject(ctx, obj, pageH, pattern.color, pattern.color, 0, &tileCTM, true, clip)
 			}
 		}
 	}

ofdgo_renderer_text.go

@@ -76,15 +76,19 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 		fillColor = colorWithAlpha(canvas.Black, obj.Alpha)
 	}
 	var fillPaint any = fillColor
+	var fillPattern *patternPaint
+	var fillColorNode *FillColor
 	if dp != nil && dp.FillColor != nil {
-		fillColorNode := withFillAlpha(dp.FillColor, obj.Alpha)
-		fillColor = parseFillColor(fillColorNode)
-		fillPaint = parseFillPaint(fillColorNode, bx, by, pageH)
+		fillColorNode = dp.FillColor
 	}
 	if obj.FillColor != nil {
-		fillColorNode := withFillAlpha(obj.FillColor, obj.Alpha)
-		fillColor = parseFillColor(fillColorNode)
-		fillPaint = parseFillPaint(fillColorNode, bx, by, pageH)
+		fillColorNode = obj.FillColor
+	}
+	if fillColorNode != nil {
+		fillColorNode = withFillAlpha(fillColorNode, obj.Alpha)
+		fillColor = r.parseFillColor(fillColorNode)
+		fillPaint = r.parseFillPaint(fillColorNode, bx, by, pageH)
+		fillPattern = r.parsePatternPaint(fillColorNode.Pattern, fillColorNode.Value, fillColorNode.Index, fillColorNode.ColorSpace, fillColorNode.Alpha)
 	}
 	if fillPaint == nil {
 		fillPaint = fillColor
@@ -96,10 +100,10 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 	strokeView := canvas.Identity
 	if shouldStroke {
 		if dp != nil {
-			strokeStyle.applyDrawParam(dp, bx, by, pageH, obj.Alpha)
+			strokeStyle.applyDrawParam(r, dp, bx, by, pageH, obj.Alpha)
 		}
 		if obj.StrokeColor != nil {
-			strokeStyle.applyStrokeColor(obj.StrokeColor, bx, by, pageH, obj.Alpha)
+			strokeStyle.applyStrokeColor(r, obj.StrokeColor, bx, by, pageH, obj.Alpha)
 		}
 		if obj.LineWidth > 0 {
 			strokeStyle.lineWidth = obj.LineWidth
@@ -111,6 +115,10 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 		strokeStyle.strokePaint, shadingClip, strokeView = resolveShdPaint(ctx, strokeStyle.strokePaint)
 		strokeClip = intersectClipPath(strokeClip, shadingClip)
 	}
+	patternCTM := TranslationMatrix(bx, by).Multiply(ctm)
+	if boundaryInCTM && parentCTM != nil {
+		patternCTM = parentCTM.Multiply(TranslationMatrix(bx, by)).Multiply(localCTM)
+	}
 	fontStyle := canvas.FontRegular
 	weight := obj.Weight
 	if weight == 0 && dp != nil && dp.Weight > 0 {
@@ -173,7 +181,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 		}
 		dxs, dys := parseFloats(tc.DeltaX), parseFloats(tc.DeltaY)
 		xs, ys := parseFloats(tc.X), parseFloats(tc.Y)
-		drawAsPath := embeddedFont || textCodePositioned(tc, xs, ys) || fillClip != nil || shadedFill || shouldStroke
+		drawAsPath := embeddedFont || textCodePositioned(tc, xs, ys) || fillClip != nil || shadedFill || fillPattern != nil || shouldStroke
 		cx, cy := 0.0, 0.0
 		previousAdvance := 0.0
 		if len(xs) > 0 {
@@ -238,7 +246,9 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 					transform = transform.Mul(glyphMatrix)
 				}
 				path := glyphPath.Copy().Transform(transform.Scale(scaleX, 1))
-				if shouldFill && fillPaint != nil {
+				if shouldFill && fillPattern != nil {
+					r.renderPattern(ctx, fillPattern, pageH, applyClipPath(path.Copy(), fillClip), patternCTM)
+				} else if shouldFill && fillPaint != nil {
 					ctx.SetFill(fillPaint)
 					ctx.SetStrokeColor(canvas.Transparent)
 					drawShdPath(ctx, applyClipPath(path.Copy(), fillClip), fillView)
@@ -247,26 +257,35 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 					path = path.Dash(strokeStyle.dashOffset, strokeStyle.dashPattern...)
 				}
 				path = path.Stroke(strokeStyle.lineWidth, strokeStyle.lineCap, strokeStyle.lineJoin, canvas.Tolerance)
+				path = applyClipPath(path, strokeClip)
+				if strokeStyle.strokePattern != nil {
+					r.renderPattern(ctx, strokeStyle.strokePattern, pageH, path, patternCTM)
+				} else {
 					ctx.SetFill(strokeStyle.strokePaint)
 					ctx.SetStrokeColor(canvas.Transparent)
-				drawShdPath(ctx, applyClipPath(path, strokeClip), strokeView)
+					drawShdPath(ctx, path, strokeView)
+				}
 				if hasUnderline {
 					underline := &canvas.Path{}
 					underline.MoveTo(0, -sizeMM*0.1)
 					underline.LineTo(glyphWidth*scaleX, -sizeMM*0.1)
 					underline = underline.Stroke(sizeMM*0.05, canvas.ButtCap, canvas.MiterJoin, canvas.Tolerance)
-					if shouldFill {
+					if shouldFill && fillPattern != nil {
+						r.renderPattern(ctx, fillPattern, pageH, applyClipPath(underline.Transform(transform), clipPath), patternCTM)
+					} else if shouldFill {
 						ctx.SetFillColor(fillColor)
 						ctx.DrawPath(0, 0, applyClipPath(underline.Transform(transform), clipPath))
+					} else if strokeStyle.strokePattern != nil {
+						r.renderPattern(ctx, strokeStyle.strokePattern, pageH, applyClipPath(underline.Transform(transform), strokeClip), patternCTM)
 					} else {
 						drawShdPath(ctx, applyClipPath(underline.Transform(transform), strokeClip), strokeView)
 					}
 				}
 				continue
 			}
-			if fillPaint != nil {
+			if fillPaint != nil || fillPattern != nil {
 				ctx.SetFill(fillPaint)
-				if fillClip != nil || shadedFill {
+				if fillClip != nil || shadedFill || fillPattern != nil {
 					scaleX := hScale
 					if advanceLimit > 0 && glyphWidth*scaleX > advanceLimit {
 						scaleX = advanceLimit / glyphWidth
@@ -277,7 +296,11 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 						textTransform = textTransform.Mul(glyphMatrix)
 					}
 					glyphPath = applyClipPath(glyphPath.Copy().Transform(textTransform.Scale(scaleX, 1)), fillClip)
+					if fillPattern != nil {
+						r.renderPattern(ctx, fillPattern, pageH, glyphPath, patternCTM)
+					} else {
 						drawShdPath(ctx, glyphPath, fillView)
+					}
 					if hasUnderline {
 						uw := sizeMM * 0.05
 						off := sizeMM * 0.1
@@ -286,10 +309,14 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 						underline.LineTo(textWidth, -off)
 						underline = underline.Stroke(uw, canvas.ButtCap, canvas.MiterJoin, canvas.Tolerance)
 						underline = applyClipPath(underline.Transform(textTransform), clipPath)
+						if fillPattern != nil {
+							r.renderPattern(ctx, fillPattern, pageH, underline, patternCTM)
+						} else {
 							ctx.SetFillColor(fillColor)
 							ctx.SetStrokeColor(canvas.Transparent)
 							ctx.DrawPath(0, 0, underline)
 						}
+					}
 					continue
 				}
 				drawGlyph := func(x, y float64) {

ofdgo_res.go

@@ -20,12 +20,26 @@ import "encoding/xml"
 type Res struct {
 	XMLName               xml.Name              `xml:"Res"`
 	BaseLoc               string                `xml:"BaseLoc,attr"`
+	ColorSpaces           ColorSpaces           `xml:"ColorSpaces"`
 	Fonts                 Fonts                 `xml:"Fonts"`
 	MultiMedias           MultiMedias           `xml:"MultiMedias"`
 	DrawParams            DrawParams            `xml:"DrawParams"`
 	CompositeGraphicUnits CompositeGraphicUnits `xml:"CompositeGraphicUnits"`
 }
 
+// ColorSpaces 颜色空间集合
+type ColorSpaces struct {
+	ColorSpace []ColorSpace `xml:"ColorSpace"`
+}
+
+// ColorSpace 颜色空间定义
+type ColorSpace struct {
+	ID               string   `xml:"ID,attr"`
+	Type             string   `xml:"Type,attr"`
+	BitsPerComponent int      `xml:"BitsPerComponent,attr"`
+	Palette          []string `xml:"Palette>CV"`
+}
+
 // Fonts 字体集合
 type Fonts struct {
 	Font []Font `xml:"Font"`