feat(字体渲染): 优化字体渲染

ofdgo_page.go

@@ -99,6 +99,7 @@ type TextObject struct {
 type FillColor struct {
 	Value    string    `xml:"Value,attr"`
 	Alpha    *int      `xml:"Alpha,attr"`
+	AxialShd *AxialShd `xml:"AxialShd"`
 }
 
 // TextCode 文本内容节点
@@ -143,6 +144,27 @@ type PathObject struct {
 type StrokeColor struct {
 	Value    string    `xml:"Value,attr"`
 	Alpha    *int      `xml:"Alpha,attr"`
+	AxialShd *AxialShd `xml:"AxialShd"`
+}
+
+// AxialShd 轴向渐变
+type AxialShd struct {
+	Extend     string       `xml:"Extend,attr"`
+	StartPoint string       `xml:"StartPoint,attr"`
+	EndPoint   string       `xml:"EndPoint,attr"`
+	Segment    []ShdSegment `xml:"Segment"`
+}
+
+// ShdSegment 渐变分段
+type ShdSegment struct {
+	Position float64  `xml:"Position,attr"`
+	Color    ShdColor `xml:"Color"`
+}
+
+// ShdColor 渐变颜色
+type ShdColor struct {
+	Value string `xml:"Value,attr"`
+	Alpha *int   `xml:"Alpha,attr"`
 }
 
 // ImageObject 图片对象

ofdgo_renderer.go

@@ -256,10 +256,10 @@ func (r *Renderer) renderLayer(ctx *canvas.Context, layer Layer, pageH float64,
 				defaultLW = dp.LineWidth
 			}
 			if dp.FillColor != nil {
-				defaultFill = parseColorWithAlpha(dp.FillColor.Value, dp.FillColor.Alpha)
+				defaultFill = parseFillColor(dp.FillColor)
 			}
 			if dp.StrokeColor != nil {
-				defaultStroke = parseColorWithAlpha(dp.StrokeColor.Value, dp.StrokeColor.Alpha)
+				defaultStroke = parseStrokeColor(dp.StrokeColor)
 			}
 		}
 	}
@@ -303,10 +303,10 @@ func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu Composite
 				defaultLW = dp.LineWidth
 			}
 			if dp.FillColor != nil {
-				defaultFill = parseColorWithAlpha(dp.FillColor.Value, dp.FillColor.Alpha)
+				defaultFill = parseFillColor(dp.FillColor)
 			}
 			if dp.StrokeColor != nil {
-				defaultStroke = parseColorWithAlpha(dp.StrokeColor.Value, dp.StrokeColor.Alpha)
+				defaultStroke = parseStrokeColor(dp.StrokeColor)
 			}
 		}
 	}
@@ -482,10 +482,10 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 				lineWidth = dp.LineWidth
 			}
 			if dp.FillColor != nil {
-				fillColor = parseColorWithAlpha(dp.FillColor.Value, dp.FillColor.Alpha)
+				fillColor = parseFillColor(dp.FillColor)
 			}
 			if dp.StrokeColor != nil {
-				strokeColor = parseColorWithAlpha(dp.StrokeColor.Value, dp.StrokeColor.Alpha)
+				strokeColor = parseStrokeColor(dp.StrokeColor)
 			}
 			if dp.Cap == "Round" {
 				lineCap = canvas.RoundCap
@@ -507,10 +507,10 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 		lineWidth = obj.LineWidth
 	}
 	if obj.FillColor != nil {
-		fillColor = parseColorWithAlpha(obj.FillColor.Value, obj.FillColor.Alpha)
+		fillColor = parseFillColor(obj.FillColor)
 	}
 	if obj.StrokeColor != nil {
-		strokeColor = parseColorWithAlpha(obj.StrokeColor.Value, obj.StrokeColor.Alpha)
+		strokeColor = parseStrokeColor(obj.StrokeColor)
 	}
 	if obj.Cap != "" {
 		if obj.Cap == "Round" {
@@ -603,10 +603,10 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 		fillColor = canvas.Black
 	}
 	if dp != nil && dp.FillColor != nil {
-		fillColor = parseColorWithAlpha(dp.FillColor.Value, dp.FillColor.Alpha)
+		fillColor = parseFillColor(dp.FillColor)
 	}
 	if obj.FillColor != nil {
-		fillColor = parseColorWithAlpha(obj.FillColor.Value, obj.FillColor.Alpha)
+		fillColor = parseFillColor(obj.FillColor)
 	}
 	fontStyle := canvas.FontRegular
 	weight := obj.Weight

ofdgo_text.go

@@ -45,6 +45,50 @@ func parseColorWithAlpha(val string, alpha *int) color.Color {
 	return color.Black
 }
 
+// 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 {
+	if fillColor == nil {
+		return nil
+	}
+	if strings.TrimSpace(fillColor.Value) != "" {
+		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+	}
+	return parseAxialShdColor(fillColor.AxialShd, fillColor.Alpha)
+}
+
+// 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 strings.TrimSpace(strokeColor.Value) != "" {
+		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
+	}
+	return parseAxialShdColor(strokeColor.AxialShd, strokeColor.Alpha)
+}
+
+// parseAxialShdColor 解析轴向渐变颜色
+// 入参: axialShd 轴向渐变节点, alpha 透明度
+// 返回: color.Color 颜色对象
+func parseAxialShdColor(axialShd *AxialShd, alpha *int) color.Color {
+	if axialShd != nil {
+		for _, segment := range axialShd.Segment {
+			if strings.TrimSpace(segment.Color.Value) == "" {
+				continue
+			}
+			if alpha == nil {
+				alpha = segment.Color.Alpha
+			}
+			return parseColorWithAlpha(segment.Color.Value, alpha)
+		}
+	}
+	return color.Black
+}
+
 // GetDeltaX 获取X轴偏移量数组
 // 返回: []float64 偏移量数组
 func (tc *TextCode) GetDeltaX() []float64 {