feat(性能优化): 优化页面渲染与文字传输性能

assets/webui/ofdgo.js

@@ -1665,6 +1665,7 @@ async function processPageRenderQueue() {
 				const page = await callWASM("ofdgoRenderPage", task.index);
 				await loadSVGFonts(page.fonts, task.openSeq);
 				if (task.openSeq === state.openSeq) {
+					page.text = JSON.parse(page.text);
 					state.pageCache.set(task.index, page);
 				}
 				task.resolve(page);

internal/webui/wasm.go

@@ -210,7 +210,7 @@ func renderPage(args []js.Value) (any, error) {
 		"svg":    page.SVG,
 		"links":  links,
 		"fonts":  fonts,
-		"text":   js.Global().Get("JSON").Call("parse", string(textData)),
+		"text":   string(textData),
 	}), nil
 }
 

internal/webui/webui.go

@@ -418,7 +418,13 @@ func (s *Session) RenderPageSVG(index int) (PageSVG, error) {
 		return PageSVG{}, err
 	}
 	var buf bytes.Buffer
-	fonts, err := s.Renderer.RenderToSVGWithFonts(page, &buf)
+	renderer := *s.Renderer
+	if s.textCache[index] == nil {
+		renderer.OnPageText = func(_ *ofdgo.PageContent, text *ofdgo.PageText) {
+			s.textCache[index] = text
+		}
+	}
+	fonts, err := renderer.RenderToSVGWithFonts(page, &buf)
 	if err != nil {
 		return PageSVG{}, err
 	}

ofdgo_renderer.go

@@ -23,10 +23,12 @@ import (
 )
 
 // Renderer 渲染器实现
+// OnPageText可选，接收页面绘制时同步提取的文字，不包含图案和签名外观
 type Renderer struct {
 	Reader                *Reader
 	DPI                   float64
 	RenderAnnotations     bool
+	OnPageText            func(*PageContent, *PageText)
 	fontFamily            *canvas.FontFamily
 	defaultFontLoaded     bool
 	DrawParams            map[string]*DrawParam
@@ -47,6 +49,7 @@ type Renderer struct {
 	fontFS                []fs.FS
 	decodeImages          bool
 	pageText              *PageText
+	textOnly              bool
 }
 
 // RendererOption 渲染器配置选项
@@ -137,6 +140,11 @@ func (r *Renderer) renderPageToContext(ctx *canvas.Context, page *PageContent, d
 	if err != nil {
 		return err
 	}
+	if r.OnPageText != nil {
+		renderer := *r
+		renderer.pageText = &PageText{}
+		r = &renderer
+	}
 	pageH := box.H
 	if drawBackground {
 		ctx.SetFillColor(canvas.White)
@@ -164,6 +172,9 @@ func (r *Renderer) renderPageToContext(ctx *canvas.Context, page *PageContent, d
 			r.renderStamp(ctx, stamp, pageH)
 		}
 	}
+	if r.OnPageText != nil {
+		r.OnPageText(page, r.pageText)
+	}
 	return nil
 }
 

ofdgo_renderer_image.go

@@ -30,7 +30,7 @@ import (
 // renderImage 渲染图片
 // 入参: ctx 画布上下文, obj 图片对象, pageH 页面高度, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM, parentClip 父级裁剪路径
 func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float64, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
-	if r.pageText != nil {
+	if r.textOnly {
 		return
 	}
 	if obj.Visible != nil && !*obj.Visible {

ofdgo_renderer_path.go

@@ -173,7 +173,7 @@ func (s *pathStyle) scale(ctm Matrix) {
 // renderPath 渲染路径
 // 入参: ctx 画布上下文, obj 路径对象, pageH 页面高度, defaults 默认绘制参数, parentCTM 父级CTM, boundaryInCTM 边界是否参与CTM变换, parentClip 父级裁剪路径
 func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64, defaults *DrawParam, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
-	if r.pageText != nil {
+	if r.textOnly {
 		return
 	}
 	if obj.Visible != nil && !*obj.Visible {
@@ -304,6 +304,11 @@ 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 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 r.pageText != nil {
+		renderer := *r
+		renderer.pageText = nil
+		r = &renderer
+	}
 	if clip == nil || clip.Empty() || len(pattern.CellContent.Objects) == 0 {
 		return
 	}
@@ -504,6 +509,7 @@ func (r *Renderer) buildClipPath(clips *Clips, pageH float64, bx, by float64, ob
 				textObj.StrokeColor = &StrokeColor{Value: "0 0 0"}
 				textRenderer := *r
 				textRenderer.pageText = nil
+				textRenderer.textOnly = false
 				textRenderer.renderText(ctx, textObj, 0, r.drawParamDefaults(area.DrawParam, nil), nil, false, nil)
 			}
 		}

ofdgo_renderer_stamp.go

@@ -28,7 +28,7 @@ import (
 // renderStamp 渲染印章
 // 入参: ctx 画布上下文, s 印章对象, pageH 页面高度
 func (r *Renderer) renderStamp(ctx *canvas.Context, s Stamp, pageH float64) {
-	if r.pageText != nil {
+	if r.textOnly {
 		return
 	}
 	if s.Type == "ofd" && len(s.Data) > 0 {

ofdgo_renderer_text.go

@@ -301,8 +301,10 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 					}
 					textRun.addSpan(textPos+spans[i][0], textPos+spans[i][1], bounds, m.Scale(scaleX, 1), clipPath, pageH)
 				}
+				if r.textOnly {
 					continue
 				}
+			}
 			if shouldStroke {
 				scaleX := hScale
 				if advanceLimit > 0 && glyphWidth*scaleX > advanceLimit {

ofdgo_search.go

@@ -65,7 +65,9 @@ func (r *Renderer) PageText(page *PageContent) (*PageText, error) {
 		return nil, err
 	}
 	renderer := *r
+	renderer.OnPageText = nil
 	renderer.pageText = &PageText{}
+	renderer.textOnly = true
 	if err := renderer.renderPageToContext(canvas.NewContext(canvas.New(box.W, box.H)), page, false); err != nil {
 		return nil, err
 	}