feat(图像解码): 提升JBIG2解码速度

assets/webui/ofdgo.js

@@ -53,7 +53,6 @@ const state = {
 	pageObserver: null,
 	visiblePages: new Set(),
 	scrollFrame: 0,
-	thumbnailCache: new Map(),
 	thumbnailInFlight: new Set(),
 	thumbnailObserver: null,
 	visibleThumbnails: new Set(),
@@ -1549,7 +1548,6 @@ async function processPageRenderQueue() {
 				const page = await callWASM("ofdgoRenderPage", task.index);
 				if (task.openSeq === state.openSeq) {
 					state.pageCache.set(task.index, page);
-					cacheThumbnail(task.index, page.svg);
 				}
 				task.resolve(page);
 			} catch (err) {
@@ -1809,7 +1807,7 @@ function renderPageList() {
 		const thumb = document.createElement("span");
 		thumb.className = "thumb-paper";
 		thumb.setAttribute("aria-hidden", "true");
-		setThumbnailContent(thumb, state.thumbnailCache.get(page.index), page.index, openSeq);
+		setThumbnailContent(thumb, state.pageCache.get(page.index)?.svg, page.index, openSeq);
 
 		const label = document.createElement("span");
 		label.className = "thumb-label";
@@ -1831,7 +1829,6 @@ function renderPageList() {
 }
 
 function resetThumbnails() {
-	state.thumbnailCache.clear();
 	state.visibleThumbnails.clear();
 	state.thumbnailInFlight.clear();
 	if (state.thumbnailObserver) {
@@ -1840,12 +1837,6 @@ function resetThumbnails() {
 	}
 }
 
-function cacheThumbnail(index, svgText) {
-	if (typeof svgText === "string" && svgText) {
-		state.thumbnailCache.set(index, svgText);
-	}
-}
-
 function setThumbnailContent(container, svgText, index, openSeq = state.openSeq) {
 	const renderKey = `${openSeq}:${index}`;
 	if (svgText && container.dataset.renderKey === renderKey) {
@@ -1923,7 +1914,7 @@ async function renderThumbnail(index, openSeq = state.openSeq) {
 	if (openSeq !== state.openSeq || !state.doc) {
 		return;
 	}
-	if (state.thumbnailCache.has(index)) {
+	if (state.pageCache.has(index)) {
 		updateThumbnail(index, openSeq);
 		return;
 	}
@@ -1956,7 +1947,7 @@ function updateThumbnail(index, openSeq = state.openSeq) {
 	}
 	const thumb = el.pageList.querySelector(`[data-page-index="${index}"] .thumb-paper`);
 	if (thumb) {
-		setThumbnailContent(thumb, state.thumbnailCache.get(index), index, openSeq);
+		setThumbnailContent(thumb, state.pageCache.get(index)?.svg, index, openSeq);
 	}
 }
 

go.mod

@@ -5,7 +5,7 @@ go 1.26.0
 require (
 	github.com/tdewolff/canvas v0.0.0-20260901160717-dae8cd8e19a7
 	github.com/tdewolff/font v0.0.0-20260822205238-d0d2f004b117
-	github.com/xiaoqidun/jbig2 v0.0.0-20260911193906-4ff0e8c3778b
+	github.com/xiaoqidun/jbig2 v0.0.0-20260912052037-9a7cadfca98c
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0
 )

go.sum

@@ -71,8 +71,8 @@ github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/wcharczuk/go-chart/v2 v2.1.2 h1:Y17/oYNuXwZg6TFag06qe8sBajwwsuvPiJJXcUcLL6E=
 github.com/wcharczuk/go-chart/v2 v2.1.2/go.mod h1:Zi4hbaqlWpYajnXB2K22IUYVXRXaLfSGNNR7P4ukyyQ=
-github.com/xiaoqidun/jbig2 v0.0.0-20260911193906-4ff0e8c3778b h1:roazxr+FPYc+8H3M/GeJFZRdsKAbLaHyoAesXSHiNak=
+github.com/xiaoqidun/jbig2 v0.0.0-20260912052037-9a7cadfca98c h1:ZnB6Js4yt9X3hcM3X+ddZUgHAD4VKoAO5EIwZxFET98=
-github.com/xiaoqidun/jbig2 v0.0.0-20260911193906-4ff0e8c3778b/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
+github.com/xiaoqidun/jbig2 v0.0.0-20260912052037-9a7cadfca98c/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
 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 v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=

internal/webui/webui.go

@@ -237,18 +237,15 @@ func (s *Session) Close() error {
 // 入参: fonts 字体文件列表
 // 返回: error 错误信息
 func (s *Session) SetFonts(fonts []FontFile) error {
-	opts := []ofdgo.RendererOption{
-		ofdgo.WithDPI(s.Renderer.DPI),
-		ofdgo.WithAnnotations(s.Renderer.RenderAnnotations),
-	}
 	if len(fonts) > 0 {
 		fontFS := ofdgo.NewFontFS(fonts)
 		if fontFS.Len() == 0 {
 			return fmt.Errorf("invalid font file")
 		}
-		opts = append(opts, ofdgo.WithFontFS(fontFS))
+		s.Renderer.SetFontFS(fontFS)
+	} else {
+		s.Renderer.SetFontFS()
 	}
-	s.Renderer = ofdgo.NewRenderer(s.Reader, opts...)
 	return nil
 }
 

ofdgo.go

@@ -20,8 +20,6 @@ import (
 	"image"
 	"io"
 	"io/fs"
-
-	"github.com/tdewolff/canvas"
 )
 
 // Open 打开OFD文件
@@ -71,18 +69,10 @@ func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
 		RenderAnnotations:     true,
 		DrawParams:            reader.drawParamCache,
 		CompositeGraphicUnits: reader.compositeGraphicUnitCache,
-		FontMap:               make(map[string]*canvas.FontFamily),
-		FontGIDMap:            make(map[string]map[uint16]rune),
-		FontCIDMap:            make(map[string]map[uint16]rune),
-		fontCache:             make(map[fontCacheKey]*canvas.FontFamily),
-		fontSourceCache:       make(map[string][]fontSource),
-		fontSourceUsed:        make(map[string]fontSource),
-		fontDirCandidates:     make(map[string][]fontFileCandidate),
-		fontFSCandidates:      make(map[int][]fontFileCandidate),
-		textGlyphPathCache:    make(map[textGlyphPathCacheKey]textGlyphPathCacheValue),
 		templatePageCache:     make(map[string]*PageContent),
 		imageCache:            make(map[string]image.Image),
 	}
+	r.resetFontCache()
 	for _, opt := range opts {
 		opt(r)
 	}

ofdgo_font_match.go

@@ -318,8 +318,11 @@ func fontDefaultSystemNames() []string {
 func fontNoSyntheticBold(names ...string) bool {
 	for _, name := range names {
 		for _, rule := range fontMatchRules {
+			if !rule.NoSyntheticBold {
+				continue
+			}
 			level := fontRuleMatchLevel(rule, name)
-			if rule.NoSyntheticBold && level >= fontMatchExact && level <= fontMatchPartial {
+			if level >= fontMatchExact && level <= fontMatchPartial {
 				return true
 			}
 		}

ofdgo_geom.go

@@ -17,6 +17,7 @@ package ofdgo
 import (
 	"fmt"
 	"math"
+	"slices"
 	"strconv"
 	"strings"
 )
@@ -30,17 +31,21 @@ type Box struct {
 // 入参: s 字符串
 // 返回: Box 矩形对象, error 错误信息
 func ParseBox(s string) (Box, error) {
-	parts := strings.Fields(s)
-	if len(parts) != 4 {
-		return Box{}, fmt.Errorf("invalid box: %s", s)
-	}
 	var values [4]float64
-	for i, part := range parts {
+	i := 0
+	for part := range strings.FieldsSeq(s) {
+		if i == len(values) {
+			return Box{}, fmt.Errorf("invalid box: %s", s)
+		}
 		value, err := strconv.ParseFloat(part, 64)
 		if err != nil {
 			return Box{}, fmt.Errorf("invalid box: %s", s)
 		}
 		values[i] = value
+		i++
+	}
+	if i != len(values) {
+		return Box{}, fmt.Errorf("invalid box: %s", s)
 	}
 	return Box{X: values[0], Y: values[1], W: values[2], H: values[3]}, nil
 }
@@ -146,11 +151,10 @@ func parseFloats(s string) []float64 {
 // 入参: s 字符串
 // 返回: []float64 浮点数数组
 func parseFloatsWithG(s string) []float64 {
-	parts := strings.Fields(s)
 	var result []float64
 	gFlag := false
 	gCount := 0
-	for _, p := range parts {
+	for p := range strings.FieldsSeq(s) {
 		if p == "g" {
 			gFlag = true
 			continue
@@ -166,6 +170,7 @@ func parseFloatsWithG(s string) []float64 {
 		}
 		if gCount > 0 {
 			v, _ := strconv.ParseFloat(p, 64)
+			result = slices.Grow(result, gCount)
 			for j := 0; j < gCount; j++ {
 				result = append(result, v)
 			}

ofdgo_renderer.go

@@ -50,6 +50,26 @@ type Renderer struct {
 // RendererOption 渲染器配置选项
 type RendererOption func(*Renderer)
 
+// SetFontFS 替换外部字体文件系统并重置字体缓存
+// 入参: fsys 字体文件系统
+func (r *Renderer) SetFontFS(fsys ...fs.FS) {
+	r.fontFS = append([]fs.FS(nil), fsys...)
+	r.resetFontCache()
+}
+
+// resetFontCache 重置字体匹配、加载和字形缓存
+func (r *Renderer) resetFontCache() {
+	r.FontMap = make(map[string]*canvas.FontFamily)
+	r.FontGIDMap = make(map[string]map[uint16]rune)
+	r.FontCIDMap = make(map[string]map[uint16]rune)
+	r.fontCache = make(map[fontCacheKey]*canvas.FontFamily)
+	r.fontSourceCache = make(map[string][]fontSource)
+	r.fontSourceUsed = make(map[string]fontSource)
+	r.fontDirCandidates = make(map[string][]fontFileCandidate)
+	r.fontFSCandidates = make(map[int][]fontFileCandidate)
+	r.textGlyphPathCache = make(map[textGlyphPathCacheKey]textGlyphPathCacheValue)
+}
+
 // RenderPage 渲染特定页面内容
 // 入参: page 页面内容
 // 返回: *canvas.Canvas 画布实例, error 错误信息

ofdgo_renderer_image.go

@@ -140,6 +140,18 @@ func imageWithMask(img, mask image.Image) image.Image {
 		maskBounds = bounds
 	}
 	out := image.NewNRGBA(bounds)
+	if src, ok := source.(*image.NRGBA); ok {
+		for y := 0; y < bounds.Dy(); y++ {
+			offset := src.PixOffset(bounds.Min.X, bounds.Min.Y+y)
+			row := out.Pix[y*out.Stride : (y+1)*out.Stride]
+			copy(row, src.Pix[offset:offset+len(row)])
+			for x := 3; x < len(row); x += 4 {
+				a := imageGrayAt(opacity, maskBounds.Min.X+x/4, maskBounds.Min.Y+y).Y
+				row[x] = uint8(int(row[x]) * int(a) / 255)
+			}
+		}
+		return out
+	}
 	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
 		for x := bounds.Min.X; x < bounds.Max.X; x++ {
 			mx := maskBounds.Min.X + x - bounds.Min.X

ofdgo_renderer_text.go

@@ -139,7 +139,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 	embeddedFont := false
 	if of, ok := r.Reader.fontCache[fontID]; ok {
 		embeddedFont = of.FontFile != ""
-		if !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
+		if syntheticBold && !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
 			syntheticBold = false
 		}
 		if of.Bold {