feat(后端架构): 完善GG后端，修复渐变与选区异常

ofdgo_renderer_image_canvas.go

@@ -121,30 +121,11 @@ func (r *Renderer) canvasEncodedImage(img image.Image) image.Image {
 // renderImageBorder 渲染图像边框
 // 入参: ctx 画布上下文, obj 图片对象, box 图像边界, pageH 页面高度, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM, clipPath 裁剪路径
 func (r *Renderer) renderImageBorder(ctx *canvas.Context, obj ImageObject, box Box, pageH float64, parentCTM *Matrix, boundaryInCTM bool, clipPath *canvas.Path) {
-	border := obj.Border
-	width := defaultPathLineWidth
-	if border.LineWidth != nil {
-		width = *border.LineWidth
-	}
-	if width == 0 {
+	border := imageBorderObject(obj, box)
+	if border.LineWidth == 0 {
 		return
 	}
-	w, h := box.W, box.H
-	data := fmt.Sprintf("M 0 0 L %g 0 L %g %g L 0 %g C", w, w, h, h)
-	rx, ry := min(border.HorizonalCornerRadius, w/2), min(border.VerticalCornerRadius, h/2)
-	if rx > 0 && ry > 0 {
-		data = fmt.Sprintf("M 0 %g A %g %g 0 0 1 %g 0 L %g 0 A %g %g 0 0 1 %g %g L %g %g A %g %g 0 0 1 %g %g L %g %g A %g %g 0 0 1 0 %g C",
-			ry, rx, ry, rx, w-rx, rx, ry, w, ry, w, h-ry, rx, ry, w-rx, h, rx, h, rx, ry, h-ry)
-	}
-	r.renderPath(ctx, PathObject{
-		Boundary:        obj.Boundary,
-		LineWidth:       width,
-		DashOffset:      &border.DashOffset,
-		DashPattern:     border.DashPattern,
-		Alpha:           obj.Alpha,
-		StrokeColor:     border.BorderColor,
-		AbbreviatedData: data,
-	}, pageH, nil, parentCTM, boundaryInCTM, clipPath)
+	r.renderPath(ctx, border, pageH, nil, parentCTM, boundaryInCTM, clipPath)
 }
 
 // imageWithClip 应用图片裁剪区域