perf(优化提升): 提升双端性能并优化内存占用

internal/webui/webui.go

@@ -419,6 +419,7 @@ type outputContext struct {
 
 // businessEngine 独立文档、编辑、剪贴板及操作上下文
 type businessEngine struct {
+	resources      *ofdgo.Resources
 	currentSession *Session
 	currentEditor  *ofdgo.Editor
 	saveSnapshot   *ofdgo.Editor
@@ -1396,7 +1397,7 @@ func (e *businessEngine) convertPDFDocument(args []platformValue) (any, error) {
 		return nil, err
 	}
 	var output bytes.Buffer
-	options := ofdgo.PDFImportOptions{OnProgress: e.editorOperationProgress(args[4]), PasswordUTF8: true}
+	options := ofdgo.PDFImportOptions{Resources: e.resources, OnProgress: e.editorOperationProgress(args[4]), PasswordUTF8: true}
 	if !args[2].IsNull() && !args[2].IsUndefined() {
 		options.Password, err = e.bytesFromJS(args[2])
 		if err != nil {
@@ -1450,7 +1451,8 @@ func (e *businessEngine) convertFile(args []platformValue) (any, error) {
 		return nil, err
 	}
 	options := ofdgo.ConvertOptions{
-		Format: settings.Get("format").String(), PageRange: settings.Get("pages").String(),
+		Resources: e.resources,
+		Format:    settings.Get("format").String(), PageRange: settings.Get("pages").String(),
 		Pool:            e.conversionPool,
 		SkipUnchanged:   true,
 		Backends:        &backends,
@@ -1608,7 +1610,7 @@ func (e *businessEngine) openDocument(args []platformValue) (any, error) {
 		return nil, err
 	}
 	renderAnnotations := args[2].Bool()
-	options := OpenOptions{Fonts: fonts, RenderAnnotations: renderAnnotations}
+	options := OpenOptions{Fonts: fonts, RenderAnnotations: renderAnnotations, ReaderOptions: []ofdgo.ReaderOption{ofdgo.WithResources(e.resources)}}
 	if len(args) > 3 && !args[3].IsNull() && !args[3].IsUndefined() {
 		credentials, err := e.credentialsFromJS(args[3])
 		if err != nil {
@@ -4047,6 +4049,7 @@ func (e *businessEngine) previewText(args []platformValue) (any, error) {
 			return nil, err
 		}
 		editor = ofdgo.NewEditor()
+		editor.SetResources(e.resources)
 		fontID, err = editor.AddFont(FontFile{Data: data}, 0)
 		if err != nil {
 			return nil, err
@@ -5568,6 +5571,7 @@ func (e *businessEngine) loadImport(args []platformValue) (any, error) {
 		}
 	}()
 	var options []ofdgo.ReaderOption
+	options = append(options, ofdgo.WithResources(e.resources))
 	if len(args) > 1 && !args[1].IsNull() && !args[1].IsUndefined() {
 		credentials, err := e.credentialsFromJS(args[1])
 		if err != nil {
@@ -5685,6 +5689,7 @@ func (e *businessEngine) importImages(args []platformValue) (any, error) {
 	editor := e.currentEditor
 	if at < 0 {
 		editor = ofdgo.NewEditor()
+		editor.SetResources(e.resources)
 		editor.Info.Title = args[3].String()
 	} else if editor == nil {
 		return nil, fmt.Errorf("document is not editable")
@@ -5721,6 +5726,7 @@ func (e *businessEngine) importImages(args []platformValue) (any, error) {
 func (e *businessEngine) createDocument(args []platformValue) (any, error) {
 	e.clearImport()
 	editor := ofdgo.NewEditor()
+	editor.SetResources(e.resources)
 	editor.Info.Title = args[0].String()
 	if _, err := editor.AddPage(args[1].Float(), args[2].Float()); err != nil {
 		return nil, err
@@ -7124,6 +7130,7 @@ func (e *businessEngine) previewSignatureSeal(args []platformValue) (any, error)
 		pages = append(pages, map[string]any{"index": index, "x": box.X, "y": box.Y, "width": box.W, "height": box.H})
 	}
 	editor := ofdgo.NewEditor()
+	editor.SetResources(e.resources)
 	if _, err := editor.AddPage(seal.Width, seal.Height); err != nil {
 		return nil, err
 	}

internal/webui/webui_native.go

@@ -70,6 +70,8 @@ type NativeOutputTarget struct {
 // hooks应在首次Call前配置，Resolve返回的资源需保持有效直到相应会话关闭
 type NativeEngine struct {
 	businessEngine
+	// Resources 协调会话的计算与缓存，需在首次Call前配置
+	Resources *ofdgo.Resources
 	// ConversionPool 协调不同会话的批量转换资源
 	ConversionPool *ofdgo.ConversionPool
 	// RenderParallelism 限制同时渲染的页面数，零值使用可用处理器数
@@ -152,6 +154,7 @@ func (e *NativeEngine) Call(ctx context.Context, name string, args []any, emit f
 		e.renderSlots = make(chan struct{}, e.renderParallelism())
 		e.resolveInput = e.input
 		e.conversionPool = e.ConversionPool
+		e.resources = e.Resources
 	})
 	if ctx == nil {
 		ctx = context.Background()
@@ -163,6 +166,13 @@ func (e *NativeEngine) Call(ctx context.Context, name string, args []any, emit f
 		case <-ctx.Done():
 			return nativeFailure(ctx.Err())
 		}
+		if e.resources != nil {
+			release, err := e.resources.Acquire(ctx, 64<<20)
+			if err != nil {
+				return nativeFailure(err)
+			}
+			defer release()
+		}
 	}
 	select {
 	case e.gate <- struct{}{}:

internal/webui/webui_wasm.go

@@ -39,7 +39,8 @@ type platformValue = js.Value
 
 // RunWASM 注册浏览器WASM接口并阻塞运行
 func RunWASM() {
-	e := &businessEngine{}
+	resources, _ := ofdgo.NewResources(ofdgo.ResourceOptions{Parallelism: 1, MemoryLimit: 64 << 20, CacheBytes: 48 << 20, SnapshotBytes: 32 << 20})
+	e := &businessEngine{resources: resources}
 	asynchronous := map[string]bool{
 		"ofdgoDetectFormat":     true,
 		"ofdgoExportVersion":    true,

internal/webview/webview.go

@@ -51,6 +51,7 @@ type Host struct {
 	engines        map[string]*webui.NativeEngine
 	engineStops    map[string]func() bool
 	conversionPool *ofdgo.ConversionPool
+	resources      *ofdgo.Resources
 	cancels        map[string]context.CancelFunc
 	batchResults   map[string]any
 	fontOnce       sync.Once
@@ -79,11 +80,16 @@ func Run(ctx context.Context, paths []string, dataDir string) error {
 		return err
 	}
 	h := &Host{files: files, engines: make(map[string]*webui.NativeEngine), cancels: make(map[string]context.CancelFunc), fontFiles: make(map[string]string), pendingPaths: append([]string(nil), paths...)}
-	h.conversionPool, err = ofdgo.NewConversionPool(ofdgo.ConversionPoolOptions{AvailableMemory: conversionMemory})
+	cacheBytes := int64(256 << 20)
+	if memory := conversionMemory; memory != nil {
+		cacheBytes = max(32<<20, memory()/8)
+	}
+	h.resources, err = ofdgo.NewResources(ofdgo.ResourceOptions{CacheBytes: cacheBytes, AvailableMemory: conversionMemory})
 	if err != nil {
 		files.close()
 		return err
 	}
+	h.conversionPool = h.resources.ConversionPool()
 	defer h.close()
 	bindings := make(map[string]guigo.HandlerFunc)
 	for _, name := range []string{"engine.open", "engine.close", "engine.call", "engine.start", "engine.cancel", "engine.finish", "batch", "open", "save", "directory", "file", "release", "child", "remove", "write.begin", "write.data", "write.commit", "write.abort", "fonts", "ready", "title"} {
@@ -271,11 +277,11 @@ func (h *Host) call(ctx context.Context, name string, value any) (any, error) {
 		parallelism, cacheBytes := runtime.GOMAXPROCS(0), int64(128<<20)
 		if memory := conversionMemory; memory != nil {
 			available := memory()
-			parallelism = max(1, min(parallelism, int(available/(256<<20))))
+			cacheBytes = max(32<<20, available/32)
-			cacheBytes = max(32<<20, min(256<<20, available/16))
 		}
 		engine.RenderParallelism = parallelism
 		engine.ConversionPool = h.conversionPool
+		engine.Resources = h.resources
 		engine.OpenWriter = h.openWriter
 		engine.ReserveOutput = h.reserveOutput
 		engine.CleanupOutput = h.cleanupOutput
@@ -798,6 +804,9 @@ func (h *Host) close() {
 	for _, result := range results {
 		h.discard(result)
 	}
+	if h.resources != nil {
+		h.resources.Clear()
+	}
 	_ = h.files.close()
 }
 

ofdgo.go

@@ -290,6 +290,9 @@ func NewReader(input *Input, options ...ReaderOption) (*Reader, error) {
 // 入参: reader 阅读器, opts 渲染选项
 // 返回: *Renderer 渲染器实例
 func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
+	if reader.resources == nil {
+		reader.resources, _ = NewResources(ResourceOptions{})
+	}
 	r := &Renderer{
 		Reader:                reader,
 		DPI:                   300.0,
@@ -297,7 +300,7 @@ func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
 		DrawParams:            reader.drawParamCache,
 		CompositeGraphicUnits: reader.compositeGraphicUnitCache,
 		templatePageCache:     make(map[string]*PageContent),
-		imageCache:            &renderCache[string, image.Image]{limit: imageCacheLimit},
+		imageCache:            resourceCache[string, image.Image](reader.resources, imageCacheLimit),
 		backends:              defaultRenderBackends(),
 		backendStates:         make(map[any]any),
 	}

ofdgo_compression.go

@@ -108,6 +108,7 @@ func (e *Editor) WriteToWithOptions(ctx context.Context, writer io.Writer, optio
 // 入参: ctx 取消上下文, writer 输出流, indexes 零基页码, options 输出配置
 // 返回: int64 已写入字节数, error 错误信息
 func (e *Editor) WritePagesTo(ctx context.Context, writer io.Writer, indexes []int, options WriteOptions) (int64, error) {
+	ctx = e.runtimeResources.context(ctx)
 	if err := ctx.Err(); err != nil {
 		return 0, err
 	}
@@ -125,6 +126,7 @@ func (e *Editor) WritePagesTo(ctx context.Context, writer io.Writer, indexes []i
 // 入参: ctx 取消上下文, options 输出配置
 // 返回: *Editor 输出快照, error 配置或资源错误
 func (e *Editor) outputSnapshot(ctx context.Context, options WriteOptions) (*Editor, error) {
+	ctx = e.runtimeResources.context(ctx)
 	if err := ctx.Err(); err != nil {
 		return nil, err
 	}

ofdgo_compression_parallel.go

@@ -20,16 +20,12 @@ import (
 	"crypto/sha256"
 	"image"
 	"io"
-	"strconv"
 	"sync"
 
 	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
 )
 
-// outputImageBatchLimit 限制并行任务持有的原始编码，超限图片单独处理
+// outputImageWorkingSetLimit 指定未提供任务预算时的图像成本估算上限
-const outputImageBatchLimit = 16 << 20
-
-// outputImageWorkingSetLimit 限制64位并行任务的像素工作量总估算，32位使用64MiB，超限图片单独处理
 const outputImageWorkingSetLimit = 256 << 20
 
 // outputImageJob 保存独立图片任务，不访问编辑文档或调用进度回调
@@ -82,20 +78,22 @@ func (e *Editor) outputImageOptions(key string) (CompressionOptions, image.Point
 // 入参: keys 资源路径, load 串行读取方法，空值表示跳过, results 候选缓存, sources 原始资源摘要，可为空
 // 返回: error 读取、进度或取消错误
 func (e *Editor) prepareOutputImages(keys []string, load func(string) ([]byte, error), results map[outputImageKey][]byte, sources map[string]outputImageSource) error {
-	workers := conversionWorkers(e.output.ctx, 4)
+	workers := conversionWorkers(e.output.ctx)
 	if workers < 2 || len(keys) < 2 {
 		return nil
 	}
-	limit, encodedLimit := outputImageWorkingSetLimit, outputImageBatchLimit
+	limit := int(min(int64(workers)*(64<<20), int64(int(^uint(0)>>1)-1)))
+	encodedLimit := limit
 	if pool, _ := e.output.ctx.Value(conversionPoolKey{}).(*ConversionPool); pool != nil {
-		if available := pool.memoryLimit(); available > 0 {
+		available := pool.memoryLimit()
+		if available == 0 {
+			return nil
+		}
+		if available > 0 {
 			limit = int(min(available, int64(int(^uint(0)>>1))))
 			encodedLimit = limit
 		}
 	}
-	if strconv.IntSize == 32 {
-		limit = 64 << 20
-	}
 	base, cancel := context.WithCancel(e.output.ctx)
 	ctx := outputImageContext{Context: base, parent: e.output.ctx}
 	var group sync.WaitGroup

ofdgo_convert.go

@@ -52,6 +52,7 @@ type ConvertProgress struct {
 // PageRange使用一基页码表达式，与Pages互斥，空字符串表示全部页面
 // SkipUnchanged仅在未压缩、源格式与目标相同且未选页时不写出数据
 // Pool可由多个独立转换共享，nil时不限制文件间并发
+// Resources提供共享计算与缓存策略，显式Pool优先控制计算调度
 // 整份PDF同格式压缩直接重写PDF对象，其余PDF先转换为OFD对象再输出
 // RendererOptions同时用于PDF局部合成和输出，在PDF.RendererOptions之后应用
 // Backends统一配置转换与输出，优先于PDF和RendererOptions中的后端设置
@@ -60,6 +61,7 @@ type ConvertProgress struct {
 // PageOutput仅用于逐页格式，同步调用export写出一页并自行处理提交或回滚；此时output可为nil
 // 未提供PageOutput时，逐页格式打包ZIP；所有回调返回错误均会停止转换
 type ConvertOptions struct {
+	Resources       *Resources
 	Input           string
 	Format          string
 	Pages           []int
@@ -145,6 +147,13 @@ func OutputFormats() []OutputFormat {
 // 入参: ctx 取消上下文, input 输入源, output 输出流, options 转换选项
 // 返回: ConvertReport 转换报告, error 错误信息
 func Convert(ctx context.Context, input *Input, output io.Writer, options ConvertOptions) (report ConvertReport, err error) {
+	if options.Resources != nil {
+		if options.Pool == nil {
+			options.Pool = options.Resources.pool
+		}
+		options.ReaderOptions = append(slices.Clone(options.ReaderOptions), WithResources(options.Resources))
+		options.PDF.Resources = options.Resources
+	}
 	if options.Pool != nil {
 		if err = options.Pool.acquire(ctx, false, 0); err != nil {
 			return report, err
@@ -534,7 +543,7 @@ func (p *ConversionPool) acquire(ctx context.Context, image bool, size int64) er
 		p.mu.Lock()
 		allowed := p.active < p.options.Parallelism && (p.active == 0 || limit != 0)
 		if image {
-			allowed = p.images < runtime.GOMAXPROCS(0) && (p.images == 0 || limit < 0 || size <= limit-p.memory)
+			allowed = p.images < p.options.Parallelism && (p.images == 0 || limit < 0 || size <= limit-p.memory)
 		}
 		if allowed {
 			if image {
@@ -584,15 +593,15 @@ func (p *ConversionPool) release(image bool, size int64) {
 }
 
 // conversionWorkers 按当前文件数量分配内部计算任务
-// 入参: ctx 转换上下文, fallback 非共享模式并行上限
+// 入参: ctx 转换上下文
 // 返回: int 内部并行数
-func conversionWorkers(ctx context.Context, fallback int) int {
+func conversionWorkers(ctx context.Context) int {
 	p, _ := ctx.Value(conversionPoolKey{}).(*ConversionPool)
 	if p == nil {
-		return min(fallback, runtime.GOMAXPROCS(0))
+		return runtime.GOMAXPROCS(0)
 	}
 	p.mu.Lock()
 	active := p.active
 	p.mu.Unlock()
-	return max(1, runtime.GOMAXPROCS(0)/max(1, active))
+	return max(1, p.options.Parallelism/max(1, active))
 }

ofdgo_crypto.go

@@ -59,7 +59,7 @@ type CryptoProvider interface {
 	EncryptKey(certificate, key []byte) ([]byte, error)
 }
 
-// ReaderOption 阅读器的凭据与密码提供者选项
+// ReaderOption 阅读器的凭据、密码提供者与资源选项
 type ReaderOption func(*readerOptions)
 
 // EncryptionRecipient 证书加密接收者，Certificate为SM2公钥证书的DER编码
@@ -92,6 +92,7 @@ type EncryptionInfo struct {
 
 // readerOptions 保存打开文档时的会话参数
 type readerOptions struct {
+	resources   *Resources
 	credentials []Credentials
 	provider    CryptoProvider
 }

ofdgo_crypto_package.go

@@ -113,6 +113,7 @@ func (r *Reader) open(options []ReaderOption) error {
 	for _, option := range options {
 		option(&settings)
 	}
+	r.resources = settings.resources
 	if settings.provider == nil {
 		settings.provider = GMCryptoProvider{}
 	}

ofdgo_editor.go

@@ -50,6 +50,7 @@ type Editor struct {
 	Info             DocInfo
 	pages            []PageContent
 	resources        []editorResource
+	runtimeResources *Resources
 	fonts            map[string]*FontResource
 	fontRegistration editorFontRegistration
 	fontDirs         []string
@@ -154,11 +155,13 @@ func (e *Editor) Backends() RenderBackends {
 // NewEditor 创建空白文档，保存前至少添加一页
 // 返回: *Editor 文档编辑器
 func NewEditor() *Editor {
+	resources, _ := NewResources(ResourceOptions{})
 	var id [16]byte
 	rand.Read(id[:])
 	id[6] = id[6]&0x0f | 0x40
 	id[8] = id[8]&0x3f | 0x80
 	return &Editor{
+		runtimeResources: resources,
 		Info: DocInfo{
 			DocID:        hex.EncodeToString(id[:]),
 			CreationDate: time.Now().Format("2006-01-02"),
@@ -172,6 +175,30 @@ func NewEditor() *Editor {
 	}
 }
 
+// SetResources 替换后续操作的资源策略，需与编辑操作串行调用
+// 已创建的阅读器和快照继续使用原策略，不修改文档或撤销记录
+// 入参: resources 共享策略，nil使用默认策略
+func (e *Editor) SetResources(resources *Resources) {
+	if resources == nil {
+		resources, _ = NewResources(ResourceOptions{})
+	}
+	if resources == e.runtimeResources {
+		return
+	}
+	e.runtimeResources = resources
+	e.snapshotArchive = nil
+	e.fontRenderer = nil
+	e.fontSourcesCache = newFontSourceCache(resources)
+	e.validatedPaths = nil
+	if e.source != nil {
+		source := *e.source
+		e.source = &source
+		e.source.reader = cloneEditorReader(e.source.reader)
+		e.source.reader.resources = resources
+		e.source.reader.pageContents = resourceCache[pageContentKey, PageContent](resources, 16<<20)
+	}
+}
+
 // PageCount 获取当前页数
 // 返回: int 页数
 func (e *Editor) PageCount() int {
@@ -773,7 +800,7 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 // 返回: *Renderer 度量器
 func (e *Editor) newRenderer(reader *Reader) *Renderer {
 	if e.fontSourcesCache == nil {
-		e.fontSourcesCache = newFontSourceCache()
+		e.fontSourcesCache = newFontSourceCache(e.runtimeResources)
 	}
 	renderer := NewRenderer(reader, WithFontDirs(e.fontDirs...), WithFontFS(e.fontFS...), WithRenderBackends(e.backends))
 	renderer.fontSourcesCache = e.fontSourcesCache.child()
@@ -1325,7 +1352,7 @@ func (v *editorValidation) creationPath(value string) error {
 // 返回: *renderCache[string, bool] 校验缓存
 func (e *Editor) pathValidationCache() *renderCache[string, bool] {
 	if e.validatedPaths == nil {
-		e.validatedPaths = &renderCache[string, bool]{limit: 8 << 20}
+		e.validatedPaths = resourceCache[string, bool](e.runtimeResources, 8<<20)
 	}
 	return e.validatedPaths
 }

ofdgo_editor_documents.go

@@ -453,6 +453,7 @@ func (e *Editor) adoptDocumentReader(ctx context.Context, reader *Reader) error
 		next.encryption = e.encryption
 		next.saveTarget = e.saveTarget
 		next.backends, next.fontDirs, next.fontFS = e.backends, e.fontDirs, e.fontFS
+		next.SetResources(e.runtimeResources)
 		next.validatedPaths = e.validatedPaths
 		*e = *next
 	}

ofdgo_editor_font_binding.go

@@ -907,6 +907,7 @@ func (e *Editor) restoreResourceSnapshot(state Editor) {
 		state.clearFontResourceCache()
 	}
 	state.backends, state.fontDirs, state.fontFS = e.backends, e.fontDirs, e.fontFS
+	state.SetResources(e.runtimeResources)
 	state.encryption, state.output, state.OnWriteProgress = e.encryption, e.output, e.OnWriteProgress
 	state.saveTarget = e.saveTarget
 	state.fontRenderer, state.fontSourcesCache = nil, nil

ofdgo_editor_history.go

@@ -53,6 +53,7 @@ func (e *Editor) Transaction(edit func(*Editor) error) error {
 		e.clearFontResourceCache()
 	}
 	e.backends, e.fontDirs, e.fontFS = before.backends, before.fontDirs, before.fontFS
+	e.SetResources(before.runtimeResources)
 	e.fontSourcesCache = before.fontSourcesCache
 	if e.sameResourceView(&before) {
 		e.fontRenderer, e.fontMetrics = before.fontRenderer, before.fontMetrics
@@ -168,6 +169,7 @@ func (e *Editor) restoreTransaction(state Editor) {
 		state.clearFontResourceCache()
 	}
 	state.backends, state.fontDirs, state.fontFS = e.backends, e.fontDirs, e.fontFS
+	state.SetResources(e.runtimeResources)
 	state.fontSourcesCache = e.fontSourcesCache
 	state.validatedPaths = e.validatedPaths
 	state.encryption, state.output, state.OnWriteProgress = e.encryption, e.output, e.OnWriteProgress

ofdgo_editor_open.go

@@ -151,6 +151,7 @@ func (r *Reader) EditorContext(ctx context.Context) (*Editor, error) {
 		}
 	}
 	e := NewEditor()
+	e.runtimeResources = r.resources
 	e.encryption = r.encryption
 	directory := cleanPackagePath(reader.RootDir)
 	e.source = &editorSource{reader: reader, document: doc, info: cloneEditorData(*info), fallbackDocID: e.Info.DocID, directory: directory, pages: make(map[string]*editorSourcePage, len(doc.Pages.Page)), origins: make(map[string]*editorObjectOrigin)}

ofdgo_editor_package.go

@@ -817,7 +817,7 @@ func (e *Editor) sourceReader(ctx context.Context, progress editorProgress) (*Re
 		files = make(map[string][]byte)
 	}
 	maps.Copy(files, parts)
-	reader := &Reader{Zip: e.source.reader.Zip, files: files, encryption: e.encryption, documentIndex: e.source.reader.documentIndex, selectedVersion: e.source.reader.selectedVersion, pageContents: e.source.reader.pageContents}
+	reader := &Reader{Zip: e.source.reader.Zip, files: files, encryption: e.encryption, documentIndex: e.source.reader.documentIndex, selectedVersion: e.source.reader.selectedVersion, pageContents: e.source.reader.pageContents, resources: e.runtimeResources}
 	if err := reader.initRootContext(ctx); err != nil {
 		return nil, err
 	}

ofdgo_font_backend.go

@@ -269,23 +269,35 @@ func (r *Renderer) fontDigest(data []byte) [32]byte {
 
 // resetFontCache 重置字体解析及字形缓存，保留图片和非字体后端状态
 func (r *Renderer) resetFontCache() {
-	r.fontSourcesCache = newFontSourceCache()
+	if r.fontSourcesCache != nil {
+		r.fontSourcesCache.collections.clear()
+	}
+	r.fontSourcesCache = newFontSourceCache(r.Reader.resources)
 	r.resetFontBackendCache()
 }
 
 // resetFontBackendCache 清理后端字体对象，保留字体文件和图片缓存
 func (r *Renderer) resetFontBackendCache() {
+	r.fontDigests.clear()
+	r.fontPreparations.clear()
+	r.fontMetrics.clear()
+	r.glyphOutlines.clear()
+	for _, state := range r.sharedBackendStates {
+		if cache, ok := state.(interface{ clear() }); ok {
+			cache.clear()
+		}
+	}
 	r.sharedBackendStates = make(map[any]any)
 	r.preparedFonts = make(map[string]*PreparedFont)
-	r.fontDigests = &renderCache[fontDataKey, [32]byte]{limit: 4 << 20}
+	r.fontDigests = resourceCache[fontDataKey, [32]byte](r.Reader.resources, 4<<20)
-	r.fontPreparations = &renderCache[[32]byte, PreparedFont]{limit: 16 << 20}
+	r.fontPreparations = resourceCache[[32]byte, PreparedFont](r.Reader.resources, 16<<20)
 	r.resolvedFonts = make(map[resolvedFontKey]resolvedFontResult)
 	if r.fontSourcesCache != nil {
 		r.fontSourcesCache.fallback = ResolvedFont{}
 		r.fontSourcesCache.fallbackRead = false
 	}
-	r.fontMetrics = &renderCache[[32]byte, FontMetrics]{limit: 32 << 20}
+	r.fontMetrics = resourceCache[[32]byte, FontMetrics](r.Reader.resources, 32<<20)
-	r.glyphOutlines = &renderCache[glyphOutlineKey, GeometryPath]{limit: 16 << 20}
+	r.glyphOutlines = resourceCache[glyphOutlineKey, GeometryPath](r.Reader.resources, 16<<20)
 	for _, state := range r.backendStates {
 		if fonts, ok := state.(interface{ resetFonts() }); ok {
 			fonts.resetFonts()

ofdgo_font_source.go

@@ -79,15 +79,16 @@ type fontSourceData struct {
 }
 
 // newFontSourceCache 创建独立字体来源缓存
+// 入参: resources 共享资源策略
 // 返回: *fontSourceCache 字体来源缓存
-func newFontSourceCache() *fontSourceCache {
+func newFontSourceCache(resources *Resources) *fontSourceCache {
-	return &fontSourceCache{candidates: make(map[string][]fontSource), directories: make(map[string][]basefont.FileCandidate), filesystems: make(map[int][]basefont.FileCandidate), data: make(map[fontSourceKey]fontSourceData), collections: &renderCache[fontSourceKey, []byte]{limit: 32 << 20}}
+	return &fontSourceCache{candidates: make(map[string][]fontSource), directories: make(map[string][]basefont.FileCandidate), filesystems: make(map[int][]basefont.FileCandidate), data: make(map[fontSourceKey]fontSourceData), collections: resourceCache[fontSourceKey, []byte](resources, 32<<20)}
 }
 
 // child 复用相同来源的文件索引与数据，匹配和回退状态保持独立
 // 返回: *fontSourceCache 独立文档缓存
 func (c *fontSourceCache) child() *fontSourceCache {
-	cache := newFontSourceCache()
+	cache := newFontSourceCache(nil)
 	cache.directories, cache.filesystems, cache.data = c.directories, c.filesystems, c.data
 	cache.collections = c.collections
 	return cache

ofdgo_pdf.go

@@ -41,7 +41,9 @@ var ErrPDFPassword = pdfgo.ErrPassword
 // ResolveReference可提供已解密的引用页面，目标阅读器由调用方维护
 // Halftones提供只读设备命名网屏，所属阅读器由调用方维护，连续色调输出不网屏化
 // Compression配置转换输出，有损模式按图片实际尺寸降采样，原始及无损模式保持完整采样
+// Resources用于导入、局部合成与返回编辑器的共享资源预算
 type PDFImportOptions struct {
+	Resources        *Resources
 	Password         []byte
 	PasswordUTF8     bool
 	Backends         *RenderBackends
@@ -68,6 +70,7 @@ type PDFImportReport struct {
 
 // pdfImporter 保存单次转换的对象与资源状态
 type pdfImporter struct {
+	resources          *Resources
 	ctx                context.Context
 	reader             *pdfgo.Reader
 	editor             *Editor
@@ -207,6 +210,10 @@ func (o pdfObjectOrigin) merge(other pdfObjectOrigin) pdfObjectOrigin {
 // 入参: ctx 取消上下文, input 输入源, options 转换选项
 // 返回: *Editor 编辑文档, PDFImportReport 转换统计, error 错误信息
 func ImportPDF(ctx context.Context, input *Input, options PDFImportOptions) (*Editor, PDFImportReport, error) {
+	if options.Resources == nil {
+		options.Resources, _ = NewResources(ResourceOptions{})
+	}
+	ctx = options.Resources.context(ctx)
 	if input == nil {
 		return nil, PDFImportReport{}, fmt.Errorf("missing source")
 	}
@@ -219,7 +226,7 @@ func ImportPDF(ctx context.Context, input *Input, options PDFImportOptions) (*Ed
 	if !finite(options.RasterDPI) || options.RasterDPI < 0 {
 		return nil, PDFImportReport{}, fmt.Errorf("invalid PDF raster DPI")
 	}
-	renderer := NewRenderer(&Reader{}, options.RendererOptions...)
+	renderer := NewRenderer(&Reader{resources: options.Resources}, options.RendererOptions...)
 	if options.Backends != nil {
 		WithRenderBackends(*options.Backends)(renderer)
 	}
@@ -234,10 +241,11 @@ func ImportPDF(ctx context.Context, input *Input, options PDFImportOptions) (*Ed
 		return nil, PDFImportReport{}, err
 	}
 	editor := NewEditor()
+	editor.runtimeResources = options.Resources
 	editor.SetRenderBackends(renderer.Backends())
 	editor.fontDirs, editor.fontFS = renderer.FontSources()
 	editor.fontSourcesCache = renderer.fontSourcesCache
-	importer := pdfImporter{ctx: ctx, editor: editor, renderer: renderer, rasterDPI: renderer.DPI, fontIDs: map[*pdfgo.Font]string{}, fonts: map[*pdfgo.Font]*pdfImportedFont{}, pages: map[pdfgo.Reference]*pdfgo.Page{}, pageIDs: map[pdfgo.Reference]string{}, structureBindings: &pdfStructureBindings{}}
+	importer := pdfImporter{resources: options.Resources, ctx: ctx, editor: editor, renderer: renderer, rasterDPI: renderer.DPI, fontIDs: map[*pdfgo.Font]string{}, fonts: map[*pdfgo.Font]*pdfImportedFont{}, pages: map[pdfgo.Reference]*pdfgo.Page{}, pageIDs: map[pdfgo.Reference]string{}, structureBindings: &pdfStructureBindings{}}
 	readOptions := pdfgo.ReaderOptions{Password: options.Password, PasswordUTF8: options.PasswordUTF8, ShapeText: importer.shapePDFText}
 	var diagnostics []pdfgo.Diagnostic
 	var readWarning func(pdfgo.Diagnostic)

ofdgo_pdf_action.go

@@ -246,6 +246,7 @@ func (p *pdfImporter) destinationBounds(page *pdfgo.Page) (Box, error) {
 	}
 	matrix, width, height := codecpdf.PageMatrix(page)
 	editor := NewEditor()
+	editor.SetResources(p.resources)
 	editor.SetRenderBackends(p.editor.Backends())
 	editor.SetFontDirs(p.editor.fontDirs...)
 	editor.SetFontFS(p.editor.fontFS...)
@@ -255,7 +256,8 @@ func (p *pdfImporter) destinationBounds(page *pdfgo.Page) (Box, error) {
 		return Box{}, err
 	}
 	local := pdfImporter{
-		ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer,
+		resources: p.resources,
+		ctx:       p.ctx, reader: p.reader, editor: editor, renderer: p.renderer,
 		matrix: matrix, pageBox: page.CropBox, pageWidth: width, pageHeight: height,
 		rasterDPI: p.rasterDPI, fontIDs: make(map[*pdfgo.Font]string),
 		resolveFile: p.resolveFile, resolveReference: p.resolveReference,

ofdgo_pdf_composite.go

@@ -126,6 +126,7 @@ type pdfCompositeImageColor struct {
 
 // pdfCompositeCache 在单页内复用几何、图像分量及蒙版内容
 type pdfCompositeCache struct {
+	resources       *Resources
 	geometry        *renderCache[pdfCompositeSceneKey, pdfCompositeGeometry]
 	clips           *renderCache[[32]byte, GeometryPath]
 	bounds          map[pdfCompositeKey]Box
@@ -157,7 +158,7 @@ type pdfCompositeScratch struct {
 // 返回: *pdfCompositeCache 当前页面缓存
 func (p *pdfImporter) compositingCache() *pdfCompositeCache {
 	if p.compositeCache == nil {
-		p.compositeCache = &pdfCompositeCache{images: map[*pdfgo.Image]*pdfgo.ImageComponents{}, masks: map[*pdfgo.SoftMask][]pdfCompositeNode{}, meshes: map[*pdfgo.MeshGradient][]codecpdf.MeshTriangle{}}
+		p.compositeCache = &pdfCompositeCache{resources: p.resources, images: map[*pdfgo.Image]*pdfgo.ImageComponents{}, masks: map[*pdfgo.SoftMask][]pdfCompositeNode{}, meshes: map[*pdfgo.MeshGradient][]codecpdf.MeshTriangle{}}
 	}
 	return p.compositeCache
 }
@@ -166,7 +167,7 @@ func (p *pdfImporter) compositingCache() *pdfCompositeCache {
 // 返回: *renderCache[pdfCompositeSceneKey, pdfCompositeGeometry] 单页场景缓存
 func (c *pdfCompositeCache) geometryCache() *renderCache[pdfCompositeSceneKey, pdfCompositeGeometry] {
 	if c.geometry == nil {
-		c.geometry = &renderCache[pdfCompositeSceneKey, pdfCompositeGeometry]{limit: 64 << 20}
+		c.geometry = resourceCache[pdfCompositeSceneKey, pdfCompositeGeometry](c.resources, 64<<20)
 	}
 	return c.geometry
 }
@@ -175,7 +176,7 @@ func (c *pdfCompositeCache) geometryCache() *renderCache[pdfCompositeSceneKey, p
 // 返回: *renderCache[[32]byte, GeometryPath] 裁剪缓存
 func (c *pdfCompositeCache) clipCache() *renderCache[[32]byte, GeometryPath] {
 	if c.clips == nil {
-		c.clips = &renderCache[[32]byte, GeometryPath]{limit: 8 << 20}
+		c.clips = resourceCache[[32]byte, GeometryPath](c.resources, 8<<20)
 	}
 	return c.clips
 }

ofdgo_pdf_form.go

@@ -108,7 +108,7 @@ func (p *pdfImporter) compositeForm(nodes []pdfCompositeNode) (bool, error) {
 		return true, nil
 	}
 	if p.formResources == nil || p.formResources.editor != p.editor {
-		p.formResources = &pdfFormCache{editor: p.editor, entries: renderCache[[32]byte, pdfFormResource]{limit: 32 << 20}}
+		p.formResources = &pdfFormCache{editor: p.editor, entries: *resourceCache[[32]byte, pdfFormResource](p.resources, 32<<20)}
 	}
 	cache := p.formResources
 	defer cache.reset()

ofdgo_pdf_geometry.go

@@ -419,7 +419,7 @@ func (p *pdfImporter) clipPath(path pdfgo.Path) (pdfClipPath, error) {
 		return pdfClipPath{}, err
 	}
 	if p.clipPaths == nil {
-		p.clipPaths = &renderCache[[32]byte, pdfClipPath]{limit: 8 << 20}
+		p.clipPaths = resourceCache[[32]byte, pdfClipPath](p.resources, 8<<20)
 	}
 	if cached, ok := p.clipPaths.get(key); ok {
 		return cached, nil

ofdgo_pdf_group.go

@@ -383,6 +383,7 @@ func (p *pdfImporter) compileGroup(build func(*pdfImporter) error) (*RasterPage,
 		return nil, box, err
 	}
 	editor := NewEditor()
+	editor.SetResources(p.resources)
 	editor.SetRenderBackends(p.editor.Backends())
 	editor.SetFontDirs(p.editor.fontDirs...)
 	editor.SetFontFS(p.editor.fontFS...)
@@ -398,9 +399,9 @@ func (p *pdfImporter) compileGroup(build func(*pdfImporter) error) (*RasterPage,
 		p.symbolFonts = make(map[*pdfgo.Font]*pdfImportedFont)
 	}
 	if p.clipPaths == nil {
-		p.clipPaths = &renderCache[[32]byte, pdfClipPath]{limit: 8 << 20}
+		p.clipPaths = resourceCache[[32]byte, pdfClipPath](p.resources, 8<<20)
 	}
-	local := pdfImporter{ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer, matrix: p.matrix, pageBox: p.pageBox, pageWidth: p.pageWidth, pageHeight: p.pageHeight, rasterDPI: p.rasterDPI, warning: p.warning, rasterWarned: true, fontIDs: map[*pdfgo.Font]string{}, fonts: p.fonts, symbolFonts: p.symbolFonts, clipPaths: p.clipPaths, textOrigins: p.textOrigins}
+	local := pdfImporter{resources: p.resources, ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer, matrix: p.matrix, pageBox: p.pageBox, pageWidth: p.pageWidth, pageHeight: p.pageHeight, rasterDPI: p.rasterDPI, warning: p.warning, rasterWarned: true, fontIDs: map[*pdfgo.Font]string{}, fonts: p.fonts, symbolFonts: p.symbolFonts, clipPaths: p.clipPaths, textOrigins: p.textOrigins}
 	if err := build(&local); err != nil {
 		return nil, box, err
 	}

ofdgo_pdf_image.go

@@ -136,7 +136,7 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 		}
 		if cacheable {
 			if p.imageContents == nil {
-				p.imageContents = &renderCache[pdfImageContentKey, pdfImageContent]{limit: 8 << 20}
+				p.imageContents = resourceCache[pdfImageContentKey, pdfImageContent](p.resources, 8<<20)
 			}
 			if cached, found := p.imageContents.get(contentKey); found && cached.matches(source) {
 				id = cached.id

ofdgo_pdf_pattern.go

@@ -69,7 +69,7 @@ func (p *pdfImporter) tilingPattern(source *pdfgo.TilingPattern, base pdfgo.Pain
 		return p.buildTilingPattern(source, base)
 	}
 	if p.patternCells == nil {
-		p.patternCells = &renderCache[pdfPatternCellKey, pdfPatternCell]{limit: pdfPatternCellLimit}
+		p.patternCells = resourceCache[pdfPatternCellKey, pdfPatternCell](p.resources, pdfPatternCellLimit)
 	}
 	key := pdfPatternCellKey{source: source, matrix: p.matrix, dpi: p.rasterDPI, editor: p.editor, space: p.compositeSpace}
 	if source.PaintType == 2 {

ofdgo_pdf_shading.go

@@ -887,7 +887,7 @@ func (p *pdfImporter) linearMeshTriangles(mesh *pdfgo.MeshGradient, index int) (
 	}
 	cache := p.compositingCache()
 	if cache.linearMeshes == nil {
-		cache.linearMeshes = &renderCache[pdfLinearMeshKey, []pdfgo.MeshTriangle]{limit: 8 << 20}
+		cache.linearMeshes = resourceCache[pdfLinearMeshKey, []pdfgo.MeshTriangle](p.resources, 8<<20)
 	}
 	key := pdfLinearMeshKey{mesh: mesh, index: index}
 	if triangles, ok := cache.linearMeshes.get(key); ok {
@@ -1047,7 +1047,7 @@ func (c *pdfCompositor) mesh(mesh *pdfgo.MeshGradient, space *pdfgo.ColorSpace,
 		}
 		c.cache.meshes[mesh] = triangles
 	}
-	options := codecpdf.MeshRasterOptions{Matrix: c.importer.matrix, Origin: pdfgo.Point{X: c.box.X, Y: c.box.Y}, DPI: c.importer.rasterDPI, Width: c.width, Height: c.height, Workers: conversionWorkers(c.importer.ctx, 4), SoftMask: c.softMask}
+	options := codecpdf.MeshRasterOptions{Matrix: c.importer.matrix, Origin: pdfgo.Point{X: c.box.X, Y: c.box.Y}, DPI: c.importer.rasterDPI, Width: c.width, Height: c.height, Workers: conversionWorkers(c.importer.ctx), SoftMask: c.softMask}
 	pixels, err := codecpdf.MeshPixels(c.importer.ctx, mesh, triangles, space, converter, options)
 	if err != nil {
 		return nil, err

ofdgo_reader.go

@@ -37,6 +37,7 @@ type Reader struct {
 	OFD                       *OFD
 	RootDir                   string
 	ResMap                    map[string]string
+	resources                 *Resources
 	resourcesRead             map[string]bool
 	resourceFiles             map[string]string
 	imageCatalog              []ImageInfo
@@ -113,7 +114,7 @@ func (r *Reader) Fork(ctx context.Context) (*Reader, error) {
 		return nil, err
 	}
 	if r.pageContents == nil {
-		r.pageContents = &renderCache[pageContentKey, PageContent]{limit: 16 << 20}
+		r.pageContents = resourceCache[pageContentKey, PageContent](r.resources, 16<<20)
 	}
 	next := *r
 	next.Closer = nil
@@ -210,7 +211,7 @@ func (r *Reader) DocumentContext(ctx context.Context, index int) (*Reader, error
 	if index < 0 || index >= r.DocumentCount() {
 		return nil, fmt.Errorf("document index %d out of range", index)
 	}
-	next := &Reader{Path: r.Path, Zip: r.Zip, files: r.files, encryption: r.encryption, documentIndex: index}
+	next := &Reader{Path: r.Path, Zip: r.Zip, files: r.files, encryption: r.encryption, documentIndex: index, resources: r.resources}
 	if err := next.initRootContext(ctx); err != nil {
 		return nil, err
 	}
@@ -762,6 +763,9 @@ func (r *Reader) initRoot() error {
 // 入参: ctx 取消上下文
 // 返回: error 索引、读取、解析或取消错误
 func (r *Reader) initRootContext(ctx context.Context) error {
+	if r.resources == nil {
+		r.resources, _ = NewResources(ResourceOptions{})
+	}
 	view := *r
 	if err := view.indexPackageContext(ctx); err != nil {
 		return err
@@ -780,7 +784,7 @@ func (r *Reader) initRootContext(ctx context.Context) error {
 	}
 	r.fileIndex, r.fileNames = view.fileIndex, view.fileNames
 	if r.pageContents == nil {
-		r.pageContents = &renderCache[pageContentKey, PageContent]{limit: 16 << 20}
+		r.pageContents = resourceCache[pageContentKey, PageContent](r.resources, 16<<20)
 	}
 	r.OFD = &ofd
 	r.doc, r.versionInfo = nil, nil
@@ -1100,7 +1104,7 @@ func (r *Reader) readPageContent(ctx context.Context, page Page, textOnly, templ
 		return nil, err
 	}
 	if r.pageContents == nil {
-		r.pageContents = &renderCache[pageContentKey, PageContent]{limit: 16 << 20}
+		r.pageContents = resourceCache[pageContentKey, PageContent](r.resources, 16<<20)
 	}
 	var content PageContent
 	if len(data) > (r.pageContents.limit/4-4096)/16 {

ofdgo_render_cache.go

@@ -21,13 +21,49 @@ import (
 	"image"
 	"reflect"
 	"sync"
+	"time"
+	"weak"
 
 	baseimage "github.com/xiaoqidun/ofdgo/internal/base/image"
 )
 
+// defaultResourceCacheBytes 定义默认缓存总预算及类别扩展基准
+const defaultResourceCacheBytes = 256 << 20
+
+// ResourceOptions 设置共享计算、派生缓存与快照预算，字节预算不限制进程实际分配
+// Parallelism为0时使用GOMAXPROCS，MemoryLimit为0时不指定计算预算
+// CacheBytes为0时使用256MiB，SnapshotBytes为0时使用缓存预算的一半，负值禁用相应缓存
+// AvailableMemory返回可用于新增任务的字节数，同时作为缓存动态上限，需支持并发且不可重入Resources
+type ResourceOptions struct {
+	Parallelism     int
+	MemoryLimit     int64
+	CacheBytes      int64
+	SnapshotBytes   int64
+	AvailableMemory func() int64
+}
+
+// Resources 协调共享缓存与计算任务，通过NewResources创建，可跨阅读器使用，不可复制
+// 缓存仅持有存活实例的弱引用，Clear释放派生数据，不关闭输入或取消任务
+type Resources struct {
+	options ResourceOptions
+	pool    *ConversionPool
+	mu      sync.Mutex
+	used    int64
+	limit   int64
+	checked time.Time
+	order   list.List
+}
+
+// resourceEntry 保存共享缓存成本与弱引用淘汰操作
+type resourceEntry struct {
+	cost  int64
+	evict func()
+}
+
 // renderCache 按估算字节数限制派生渲染数据，淘汰不修改源资源
 type renderCache[K comparable, V any] struct {
 	mu          sync.Mutex
+	resources   *Resources
 	limit, used int
 	entries     map[K]*list.Element
 	order       list.List
@@ -43,19 +79,178 @@ type renderCacheLoad[V any] struct {
 
 // renderCacheEntry 保存缓存值及内存成本
 type renderCacheEntry[K comparable, V any] struct {
-	key   K
+	key    K
-	value V
+	value  V
-	cost  int
+	cost   int
+	shared *list.Element
+}
+
+// NewResources 创建共享资源策略，不启动任务或修改进程全局配置
+// 入参: options 并行及内存选项
+// 返回: *Resources 共享策略, error 参数错误
+func NewResources(options ResourceOptions) (*Resources, error) {
+	pool, err := NewConversionPool(ConversionPoolOptions{Parallelism: options.Parallelism, MemoryLimit: options.MemoryLimit, AvailableMemory: options.AvailableMemory})
+	if err != nil {
+		return nil, err
+	}
+	if options.CacheBytes == 0 {
+		options.CacheBytes = defaultResourceCacheBytes
+	}
+	options.CacheBytes = max(0, options.CacheBytes)
+	if options.SnapshotBytes == 0 {
+		options.SnapshotBytes = options.CacheBytes / 2
+	}
+	options.SnapshotBytes = max(0, min(options.SnapshotBytes, options.CacheBytes))
+	return &Resources{options: options, pool: pool, limit: options.CacheBytes}, nil
+}
+
+// ConversionPool 返回资源策略共享的转换调度器
+// 返回: *ConversionPool 转换调度器
+func (r *Resources) ConversionPool() *ConversionPool { return r.pool }
+
+// Acquire 等待一个计算任务及其估算工作集额度，允许超预算任务独占执行
+// 调用方必须调用返回的释放函数，重复释放无效，不可持有额度再嵌套申请
+// 入参: ctx 等待上下文, memory 估算字节数，零值仅限制并行
+// 返回: func() 释放额度, error 参数或取消错误
+func (r *Resources) Acquire(ctx context.Context, memory int64) (func(), error) {
+	if memory < 0 {
+		return nil, errors.New("invalid task memory")
+	}
+	if err := r.pool.acquire(ctx, true, memory); err != nil {
+		return nil, err
+	}
+	var once sync.Once
+	return func() { once.Do(func() { r.pool.release(true, memory) }) }, nil
+}
+
+// context 为未指定转换池的操作附加资源调度器
+// 入参: ctx 操作上下文
+// 返回: context.Context 计算上下文
+func (r *Resources) context(ctx context.Context) context.Context {
+	if r == nil || ctx.Value(conversionPoolKey{}) != nil {
+		return ctx
+	}
+	return context.WithValue(ctx, conversionPoolKey{}, r.pool)
+}
+
+// WithResources 设置阅读器及派生编辑器共享的资源策略
+// 入参: resources 共享策略，nil使用默认策略
+// 返回: ReaderOption 阅读选项
+func WithResources(resources *Resources) ReaderOption {
+	return func(options *readerOptions) { options.resources = resources }
+}
+
+// Clear 释放当前缓存，正在计算的任务完成后仍可写入新缓存
+func (r *Resources) Clear() {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	for r.order.Len() != 0 {
+		r.evict()
+	}
+}
+
+// CacheUsage 返回当前登记的派生缓存估算字节数，不含任务临时内存
+// 返回: int64 缓存成本
+func (r *Resources) CacheUsage() int64 {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	return r.used
+}
+
+// refresh 按当前可用内存收缩缓存，需持有资源锁
+func (r *Resources) refresh() {
+	if r.options.AvailableMemory == nil || time.Since(r.checked) < 250*time.Millisecond {
+		return
+	}
+	r.checked = time.Now()
+	r.limit = min(r.options.CacheBytes, max(0, r.options.AvailableMemory()))
+	for r.used > r.limit {
+		r.evict()
+	}
+}
+
+// evict 淘汰最久未访问的共享条目，需持有资源锁
+func (r *Resources) evict() {
+	item := r.order.Back()
+	entry := item.Value.(resourceEntry)
+	r.order.Remove(item)
+	r.used -= entry.cost
+	entry.evict()
+}
+
+// resourceCache 按类别基准分配共享预算，较大总预算同比扩展类别额度
+// 入参: resources 共享策略, baseline 类别基准预算
+// 返回: *renderCache 缓存实例
+func resourceCache[K comparable, V any](resources *Resources, baseline int) *renderCache[K, V] {
+	if resources == nil {
+		return &renderCache[K, V]{limit: baseline}
+	}
+	limit := min(resources.options.CacheBytes, int64(int(^uint(0)>>1)-1))
+	if baseline > 0 && limit > int64(baseline) {
+		share := int64(baseline)
+		if limit > defaultResourceCacheBytes {
+			scaled := float64(baseline) * (float64(limit) / defaultResourceCacheBytes)
+			share = limit
+			if scaled < float64(limit) {
+				share = int64(scaled)
+			}
+		}
+		limit = min(limit, share)
+	}
+	return &renderCache[K, V]{resources: resources, limit: int(limit)}
+}
+
+// mutex 返回缓存数据及共享账本使用的同一把锁
+// 返回: *sync.Mutex 缓存锁
+func (c *renderCache[K, V]) mutex() *sync.Mutex {
+	if c.resources != nil {
+		return &c.resources.mu
+	}
+	return &c.mu
+}
+
+// touch 更新本地及共享条目的访问顺序，需持有缓存锁
+// 入参: item 缓存条目
+func (c *renderCache[K, V]) touch(item *list.Element) {
+	c.order.MoveToFront(item)
+	if shared := item.Value.(renderCacheEntry[K, V]).shared; shared != nil {
+		c.resources.order.MoveToFront(shared)
+	}
+}
+
+// remove 删除本地条目并归还共享预算，需持有缓存锁
+// 入参: item 缓存条目
+func (c *renderCache[K, V]) remove(item *list.Element) {
+	entry := item.Value.(renderCacheEntry[K, V])
+	c.used -= entry.cost
+	c.order.Remove(item)
+	delete(c.entries, entry.key)
+	if entry.shared != nil {
+		c.resources.used -= int64(entry.cost)
+		c.resources.order.Remove(entry.shared)
+	}
+}
+
+// clear 释放已有缓存条目并归还共享预算，不取消正在加载的任务
+func (c *renderCache[K, V]) clear() {
+	if c == nil {
+		return
+	}
+	c.mutex().Lock()
+	defer c.mutex().Unlock()
+	for c.order.Len() != 0 {
+		c.remove(c.order.Back())
+	}
 }
 
 // get 读取缓存并更新使用顺序
 // 入参: key 缓存键
 // 返回: V 缓存值, bool 是否命中
 func (c *renderCache[K, V]) get(key K) (V, bool) {
-	c.mu.Lock()
+	c.mutex().Lock()
-	defer c.mu.Unlock()
+	defer c.mutex().Unlock()
 	if item := c.entries[key]; item != nil {
-		c.order.MoveToFront(item)
+		c.touch(item)
 		return item.Value.(renderCacheEntry[K, V]).value, true
 	}
 	var zero V
@@ -65,12 +260,10 @@ func (c *renderCache[K, V]) get(key K) (V, bool) {
 // put 缓存预算内的派生数据，超大单项不进入缓存
 // 入参: key 缓存键, value 缓存值, cost 字节成本
 func (c *renderCache[K, V]) put(key K, value V, cost int) {
-	c.mu.Lock()
+	c.mutex().Lock()
-	defer c.mu.Unlock()
+	defer c.mutex().Unlock()
 	if item := c.entries[key]; item != nil {
-		c.used -= item.Value.(renderCacheEntry[K, V]).cost
+		c.remove(item)
-		c.order.Remove(item)
-		delete(c.entries, key)
 	}
 	if cost <= 0 || cost > c.limit {
 		return
@@ -78,15 +271,43 @@ func (c *renderCache[K, V]) put(key K, value V, cost int) {
 	if c.entries == nil {
 		c.entries = make(map[K]*list.Element)
 	}
-	for c.used+cost > c.limit {
+	for cost > c.limit-c.used {
 		item := c.order.Back()
-		entry := item.Value.(renderCacheEntry[K, V])
+		c.remove(item)
-		c.used -= entry.cost
-		delete(c.entries, entry.key)
-		c.order.Remove(item)
 	}
-	c.entries[key] = c.order.PushFront(renderCacheEntry[K, V]{key, value, cost})
+	entry := renderCacheEntry[K, V]{key: key, value: value, cost: cost}
+	if r := c.resources; r != nil {
+		r.refresh()
+		if int64(cost) > r.limit {
+			return
+		}
+		for int64(cost) > r.limit-r.used {
+			r.evict()
+		}
+	}
+	item := c.order.PushFront(entry)
+	c.entries[key] = item
 	c.used += cost
+	if r := c.resources; r != nil {
+		ref, entryRef := weak.Make(c), weak.Make(item)
+		entry.shared = r.order.PushFront(resourceEntry{cost: int64(cost), evict: func() {
+			if cache := ref.Value(); cache != nil {
+				previous := entryRef.Value()
+				if previous == nil {
+					return
+				}
+				entry := previous.Value.(renderCacheEntry[K, V])
+				if cache.entries[entry.key] != previous {
+					return
+				}
+				cache.used -= entry.cost
+				cache.order.Remove(previous)
+				delete(cache.entries, entry.key)
+			}
+		}})
+		item.Value = entry
+		r.used += int64(cost)
+	}
 }
 
 // load 复用缓存并合并并发请求，等待取消不影响正在读取的任务
@@ -101,15 +322,15 @@ func (c *renderCache[K, V]) load(ctx context.Context, key K, read func() (V, int
 		if err := ctx.Err(); err != nil {
 			return zero, err
 		}
-		c.mu.Lock()
+		c.mutex().Lock()
 		if item := c.entries[key]; item != nil {
-			c.order.MoveToFront(item)
+			c.touch(item)
 			value := item.Value.(renderCacheEntry[K, V]).value
-			c.mu.Unlock()
+			c.mutex().Unlock()
 			return value, nil
 		}
 		if pending := c.loading[key]; pending != nil {
-			c.mu.Unlock()
+			c.mutex().Unlock()
 			select {
 			case <-ctx.Done():
 				return zero, ctx.Err()
@@ -125,12 +346,12 @@ func (c *renderCache[K, V]) load(ctx context.Context, key K, read func() (V, int
 		}
 		pending := &renderCacheLoad[V]{done: make(chan struct{}), err: errors.New("resource loading interrupted")}
 		c.loading[key] = pending
-		c.mu.Unlock()
+		c.mutex().Unlock()
 		defer func() {
-			c.mu.Lock()
+			c.mutex().Lock()
 			delete(c.loading, key)
 			close(pending.done)
-			c.mu.Unlock()
+			c.mutex().Unlock()
 		}()
 		value, cost, err := read()
 		if err == nil {

ofdgo_render_compile.go

@@ -77,7 +77,7 @@ func newSemanticCompiler(r *Renderer) (*semanticCompiler, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &semanticCompiler{renderer: r, geometry: geometry, patterns: &renderCache[patternCellKey, []RasterCommand]{limit: 8 << 20}}, nil
+	return &semanticCompiler{renderer: r, geometry: geometry, patterns: resourceCache[patternCellKey, []RasterCommand](r.Reader.resources, 8<<20)}, nil
 }
 
 // segments 转换光栅曲线，仅在输出边界展开椭圆弧

ofdgo_render_pattern.go

@@ -34,8 +34,9 @@ type stampContentKey struct {
 
 // stampContentState 保存有界的共享签章编译结果及配置
 type stampContentState struct {
-	config RenderBackends
+	resources *Resources
-	cache  renderCache[stampContentKey, []RasterCommand]
+	config    RenderBackends
+	cache     renderCache[stampContentKey, []RasterCommand]
 }
 
 // stampContentStateKey 隔离渲染器私有的共享签章数据
@@ -52,7 +53,8 @@ type patternCellKey struct {
 
 // resetFonts 使包含文字的签章编译结果随字体配置失效
 func (s *stampContentState) resetFonts() {
-	s.cache = renderCache[stampContentKey, []RasterCommand]{limit: 16 << 20}
+	s.cache.clear()
+	s.cache = *resourceCache[stampContentKey, []RasterCommand](s.resources, 16<<20)
 }
 
 // sharedStamp 复用相同签章的解码、嵌套文档编译及局部裁剪，不缓存放置位置
@@ -74,7 +76,7 @@ func (c *semanticCompiler) sharedStamp(stamp Stamp, compile func(*semanticCompil
 	config := r.backends
 	if state == nil || !sameBackend(state.config.Fonts, config.Fonts) || !sameBackend(state.config.Geometry, config.Geometry) ||
 		!sameBackend(state.config.Compiler, config.Compiler) || !sameBackend(state.config.Raster, config.Raster) {
-		state = &stampContentState{config: config}
+		state = &stampContentState{config: config, resources: r.Reader.resources}
 		state.resetFonts()
 		r.backendStates[stampContentStateKey{}] = state
 	}

ofdgo_renderer.go

@@ -89,6 +89,11 @@ func (r *Renderer) Fork(ctx context.Context) (*Renderer, error) {
 	next.fontPreparations = r.fontPreparations
 	next.fontMetrics = r.fontMetrics
 	next.glyphOutlines = r.glyphOutlines
+	next.sharedBackendStates[canvasPathCacheKey{}] = r.canvasParsedPaths()
+	next.sharedBackendStates[canvasClipCacheKey{}] = r.canvasClipIntersections()
+	next.sharedBackendStates[canvasFillCacheKey{}] = r.canvasSettledPaths()
+	next.sharedBackendStates[canvasDrawClipCacheKey{}] = r.canvasDrawClips()
+	next.sharedBackendStates[svgResourceCacheKey{}] = r.svgImageResources()
 	return next, nil
 }
 
@@ -108,8 +113,9 @@ func (r *Renderer) deviceLineWidth(width float64) float64 {
 
 // ClearCache 释放派生字体、图片、模板与后端缓存，不改变文档和渲染配置
 func (r *Renderer) ClearCache() {
+	r.imageCache.clear()
 	r.backendStates = make(map[any]any)
-	r.imageCache = &renderCache[string, image.Image]{limit: imageCacheLimit}
+	r.imageCache = resourceCache[string, image.Image](r.Reader.resources, imageCacheLimit)
 	r.templatePageCache = make(map[string]*PageContent)
 	r.resetFontCache()
 }

ofdgo_renderer_clip_canvas.go

@@ -42,7 +42,7 @@ func (r *clipRenderer) RenderPath(path *canvas.Path, style canvas.Style, m canva
 		r.add(applyClipPath(path.Copy().Transform(m), r.clip))
 	}
 	if style.HasStroke() {
-		p := path.Dash(style.DashOffset, style.Dashes...).Stroke(style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance)
+		p := strokeCanvasPath(path.Dash(style.DashOffset, style.Dashes...), style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance)
 		r.add(applyClipPath(p.Transform(m), r.clip))
 	}
 }
@@ -164,7 +164,7 @@ func (r *Renderer) buildClipAreaPath(obj PathObject, drawParam string, parent Ma
 		}
 		result = paths.Merge()
 		if obj.Rule == "Even-Odd" {
-			result = result.Settle(canvas.EvenOdd)
+			result = settleCanvasPath(result, canvas.EvenOdd)
 		}
 	}
 	if stroke {
@@ -255,12 +255,12 @@ func intersectClipPath(parent, current *canvas.Path) *canvas.Path {
 		return result
 	}
 	if result, ok := intersectLinearCanvasContours(parent, current); ok {
-		return result.Settle(canvas.NonZero)
+		return settleCanvasPath(result, canvas.NonZero)
 	}
 	if result, ok := intersectLinearCanvasContours(current, parent); ok {
-		return result.Settle(canvas.NonZero)
+		return settleCanvasPath(result, canvas.NonZero)
 	}
-	return parent.And(current)
+	return combineCanvasPaths(parent, current, "and")
 }
 
 // intersectConvexCanvasPaths 逐边裁剪单个凸多边形，避免仿射矩形共边进入曲线扫线
@@ -396,7 +396,7 @@ func unionClipPath(left, right *canvas.Path) *canvas.Path {
 			return bounds.ToPath()
 		}
 	}
-	return left.Or(right)
+	return combineCanvasPaths(left, right, "or")
 }
 
 // applyClipPath 应用裁剪路径
@@ -432,12 +432,12 @@ func applyClipPath(path, clip *canvas.Path) *canvas.Path {
 		return result
 	}
 	if result, ok := intersectLinearCanvasContours(path, clip); ok {
-		return result.Settle(canvas.NonZero)
+		return settleCanvasPath(result, canvas.NonZero)
 	}
 	if result, ok := intersectLinearCanvasContours(clip, path); ok {
-		return result.Settle(canvas.NonZero)
+		return settleCanvasPath(result, canvas.NonZero)
 	}
-	return path.And(clip)
+	return combineCanvasPaths(path, clip, "and")
 }
 
 // pruneCanvasContours 排除与裁剪边界分离的完整轮廓，保留相交轮廓的曲线和绕向

ofdgo_renderer_geom_canvas.go

@@ -20,10 +20,50 @@ import (
 	"math"
 	"slices"
 	"strconv"
+	"sync"
 
 	"github.com/tdewolff/canvas"
 )
 
+// canvasGeometryMu 保护底层路径运算的共享扫描线对象池
+var canvasGeometryMu sync.Mutex
+
+// settleCanvasPath 在共享对象池保护下归整路径
+// 入参: path 路径, rule 填充规则
+// 返回: *canvas.Path 归整路径
+func settleCanvasPath(path *canvas.Path, rule canvas.FillRule) *canvas.Path {
+	canvasGeometryMu.Lock()
+	defer canvasGeometryMu.Unlock()
+	return path.Settle(rule)
+}
+
+// combineCanvasPaths 在共享对象池保护下计算路径布尔运算
+// 入参: left 左路径, right 右路径, operation 运算名称
+// 返回: *canvas.Path 运算结果
+func combineCanvasPaths(left, right *canvas.Path, operation string) *canvas.Path {
+	canvasGeometryMu.Lock()
+	defer canvasGeometryMu.Unlock()
+	switch operation {
+	case "or":
+		return left.Or(right)
+	case "not":
+		return left.Not(right)
+	case "xor":
+		return left.Xor(right)
+	default:
+		return left.And(right)
+	}
+}
+
+// strokeCanvasPath 在共享对象池保护下生成描边轮廓
+// 入参: path 路径, width 线宽, cap 端点, join 连接, tolerance 容差
+// 返回: *canvas.Path 描边轮廓
+func strokeCanvasPath(path *canvas.Path, width float64, cap canvas.Capper, join canvas.Joiner, tolerance float64) *canvas.Path {
+	canvasGeometryMu.Lock()
+	defer canvasGeometryMu.Unlock()
+	return path.Stroke(width, cap, join, tolerance)
+}
+
 // Curves 在输出边界转换椭圆弧，其他曲线保持原样
 // 入参: path 页面路径
 // 返回: GeometryPath 贝塞尔路径, error 路径错误
@@ -108,7 +148,7 @@ func (CanvasBackend) Normalize(path GeometryPath, evenOdd bool) (GeometryPath, e
 	if evenOdd {
 		rule = canvas.EvenOdd
 	}
-	p = p.Settle(rule)
+	p = settleCanvasPath(p, rule)
 	if p.Empty() {
 		return nil, nil
 	}
@@ -132,11 +172,11 @@ func (CanvasBackend) Combine(left, right GeometryPath, operation GeometryOperati
 	case GeometryIntersect:
 		result = applyClipPath(a, b)
 	case GeometryUnion:
-		result = a.Or(b)
+		result = combineCanvasPaths(a, b, "or")
 	case GeometrySubtract:
-		result = a.Not(b)
+		result = combineCanvasPaths(a, b, "not")
 	case GeometryXor:
-		result = a.Xor(b)
+		result = combineCanvasPaths(a, b, "xor")
 	default:
 		return nil, fmt.Errorf("unsupported geometry operation %d", operation)
 	}
@@ -178,7 +218,7 @@ func (CanvasBackend) Stroke(path GeometryPath, options StrokeOptions) (result Ge
 	style.lineCap = pathLineCap(options.Cap, style.lineCap)
 	p = p.Dash(options.DashOffset, options.Dashes...)
 	p = flattenCanvasPath(p, tolerance)
-	p = p.Stroke(options.Width, style.lineCap, style.lineJoin, tolerance)
+	p = strokeCanvasPath(p, options.Width, style.lineCap, style.lineJoin, tolerance)
 	return *geometryFromCanvasPath(p), nil
 }
 

ofdgo_renderer_measure_canvas.go

@@ -106,7 +106,7 @@ func (r *boundsRenderer) RenderPath(path *canvas.Path, style canvas.Style, m can
 		r.addContour(path.Copy().Transform(m), style.FillRule == canvas.EvenOdd)
 	}
 	if style.HasStroke() {
-		p := path.Dash(style.DashOffset, style.Dashes...).Stroke(style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance)
+		p := strokeCanvasPath(path.Dash(style.DashOffset, style.Dashes...), style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance)
 		r.add(p.Transform(m))
 	}
 }

ofdgo_renderer_output_canvas.go

@@ -151,10 +151,10 @@ func (CanvasBackend) RenderPDF(r *Renderer, pages []RenderDocumentPage, writer i
 	}
 	start := buf.Len()
 	p := pdf.New(buf, pages[0].Box.W, pages[0].Box.H, nil)
-	renderer := &pdfRenderer{PDF: p, glyphPaths: renderCache[*canvas.Path, *canvas.Path]{limit: 16 << 20}, images: make([][]image.Image, 1), text: make([]codecpdf.TextPage, 1), navigation: navigation}
+	renderer := &pdfRenderer{PDF: p, glyphPaths: *resourceCache[*canvas.Path, *canvas.Path](r.Reader.resources, 16<<20), images: make([][]image.Image, 1), text: make([]codecpdf.TextPage, 1), navigation: navigation}
 	defer func() {
 		if renderer.imageError != nil {
-			r.canvasState().images = renderCache[*EncodedImage, image.Image]{limit: imageCacheLimit}
+			r.canvasState().images = *resourceCache[*EncodedImage, image.Image](r.Reader.resources, imageCacheLimit)
 		}
 	}()
 	var info DocInfo

ofdgo_renderer_shading_canvas.go

@@ -127,7 +127,7 @@ func resolveShdPaint(ctx *canvas.Context, paint any) (any, *canvas.Path, canvas.
 		if g.gradient.Mesh != nil && g.gradient.Mesh.Background.A == 0 {
 			outline := g.gradient.Mesh.outline()
 			clip, _ := canvasObjectPath(outline)
-			return g, clip.Settle(canvas.NonZero).Transform(s.view), s.view
+			return g, settleCanvasPath(clip, canvas.NonZero).Transform(s.view), s.view
 		}
 		return g, nil, s.view
 	case *canvas.LinearGradient:
@@ -259,7 +259,7 @@ func (r *Renderer) drawShdPath(ctx *canvas.Context, path *canvas.Path, view canv
 func drawRepeatAxialPath(ctx *canvas.Context, path *canvas.Path, gradient *repeatAxialGradient, view canvas.Matrix) {
 	p := path.Copy()
 	if ctx.FillRule == canvas.EvenOdd {
-		p = p.Settle(canvas.EvenOdd)
+		p = settleCanvasPath(p, canvas.EvenOdd)
 	}
 	p = p.Transform(view.Inv())
 	d := gradient.End.Sub(gradient.Start).Mul(gradient.period)
@@ -335,7 +335,7 @@ func radialShdClip(g *canvas.RadialGradient, extend int, bounds canvas.Rect) *ca
 		clip = bounds.ToPath()
 	}
 	if extend&1 == 0 && r0 > 0 {
-		clip = clip.Not(canvas.Circle(r0).Translate(inner.X, inner.Y))
+		clip = combineCanvasPaths(clip, canvas.Circle(r0).Translate(inner.X, inner.Y), "not")
 	}
 	return clip
 }

ofdgo_renderer_state_canvas.go

@@ -40,6 +40,9 @@ type canvasPathCacheKey struct{}
 // canvasFillCacheKey 区分按填充规则规范化的共享路径缓存
 type canvasFillCacheKey struct{}
 
+// canvasDrawClipCacheKey 区分绘制轮廓的共享裁剪缓存
+type canvasDrawClipCacheKey struct{}
+
 // canvasOutlineCacheKey 区分子渲染器共享的字体轮廓解析缓存
 type canvasOutlineCacheKey struct{}
 
@@ -57,6 +60,7 @@ type canvasPathKey struct {
 
 // canvasBackendState 保存Canvas字体、字形和编码图片适配缓存
 type canvasBackendState struct {
+	resources          *Resources
 	images             renderCache[*EncodedImage, image.Image]
 	fontMap            map[string]*canvas.FontFamily
 	svgFontCache       map[*canvas.Font]SVGFont
@@ -74,7 +78,7 @@ func (r *Renderer) canvasClipIntersections() *renderCache[[32]byte, *canvas.Path
 	if r.sharedBackendStates == nil {
 		r.sharedBackendStates = make(map[any]any)
 	}
-	cache := &renderCache[[32]byte, *canvas.Path]{limit: 8 << 20}
+	cache := resourceCache[[32]byte, *canvas.Path](r.Reader.resources, 8<<20)
 	r.sharedBackendStates[key] = cache
 	return cache
 }
@@ -89,7 +93,7 @@ func (r *Renderer) canvasParsedPaths() *renderCache[canvasPathKey, *canvas.Path]
 	if r.sharedBackendStates == nil {
 		r.sharedBackendStates = make(map[any]any)
 	}
-	cache := &renderCache[canvasPathKey, *canvas.Path]{limit: 16 << 20}
+	cache := resourceCache[canvasPathKey, *canvas.Path](r.Reader.resources, 16<<20)
 	r.sharedBackendStates[key] = cache
 	return cache
 }
@@ -104,7 +108,7 @@ func (r *Renderer) canvasSettledPaths() *renderCache[canvasFillKey, *canvas.Path
 	if r.sharedBackendStates == nil {
 		r.sharedBackendStates = make(map[any]any)
 	}
-	cache := &renderCache[canvasFillKey, *canvas.Path]{limit: 16 << 20}
+	cache := resourceCache[canvasFillKey, *canvas.Path](r.Reader.resources, 16<<20)
 	r.sharedBackendStates[key] = cache
 	return cache
 }
@@ -116,11 +120,45 @@ func (r *Renderer) canvasFontFamilies() *renderCache[canvasFontKey, *canvas.Font
 	if state, ok := r.sharedBackendStates[key]; ok {
 		return state.(*renderCache[canvasFontKey, *canvas.FontFamily])
 	}
-	cache := &renderCache[canvasFontKey, *canvas.FontFamily]{limit: 32 << 20}
+	cache := resourceCache[canvasFontKey, *canvas.FontFamily](r.Reader.resources, 32<<20)
 	r.sharedBackendStates[key] = cache
 	return cache
 }
 
+// canvasDrawClips 获取派生渲染器共享的绘制裁剪缓存
+// 返回: *renderCache 绘制裁剪缓存
+func (r *Renderer) canvasDrawClips() *renderCache[[32]byte, *canvas.Path] {
+	key := canvasDrawClipCacheKey{}
+	if state, ok := r.sharedBackendStates[key]; ok {
+		return state.(*renderCache[[32]byte, *canvas.Path])
+	}
+	cache := resourceCache[[32]byte, *canvas.Path](r.Reader.resources, 16<<20)
+	r.sharedBackendStates[key] = cache
+	return cache
+}
+
+// applyCachedClipPath 复用绘制轮廓的裁剪结果，返回可独立变换的副本
+// 入参: path 绘制轮廓, clip 裁剪轮廓
+// 返回: *canvas.Path 裁剪结果
+func (r *Renderer) applyCachedClipPath(path, clip *canvas.Path) *canvas.Path {
+	if path == nil || clip == nil {
+		return path
+	}
+	if rect, ok := rectangularPath(clip); ok && rect.Contains(path.Bounds()) {
+		return reduceRepeatedNonZeroPath(path)
+	}
+	key := canvasGeometryDigest(path, clip)
+	result, err := r.canvasDrawClips().load(r.pageContext, key, func() (*canvas.Path, int, error) {
+		result := applyClipPath(path, clip).Copy()
+		return result, len(result.Data())*8 + 256, nil
+	})
+	if err != nil {
+		r.renderError = err
+		return &canvas.Path{}
+	}
+	return result.Copy()
+}
+
 // canvasFontOutlines 获取子渲染器共享的字体轮廓解析缓存，限制字体及解析数据保留量
 // 返回: *renderCache[*canvas.Font, *basefont.Outliner] 字体轮廓缓存
 func (r *Renderer) canvasFontOutlines() *renderCache[*canvas.Font, *basefont.Outliner] {
@@ -128,7 +166,7 @@ func (r *Renderer) canvasFontOutlines() *renderCache[*canvas.Font, *basefont.Out
 	if state, ok := r.sharedBackendStates[key]; ok {
 		return state.(*renderCache[*canvas.Font, *basefont.Outliner])
 	}
-	cache := &renderCache[*canvas.Font, *basefont.Outliner]{limit: 32 << 20}
+	cache := resourceCache[*canvas.Font, *basefont.Outliner](r.Reader.resources, 32<<20)
 	r.sharedBackendStates[key] = cache
 	return cache
 }
@@ -141,7 +179,8 @@ func (r *Renderer) canvasState() *canvasBackendState {
 		return state.(*canvasBackendState)
 	}
 	state := &canvasBackendState{
-		images: renderCache[*EncodedImage, image.Image]{limit: imageCacheLimit},
+		resources: r.Reader.resources,
+		images:    *resourceCache[*EncodedImage, image.Image](r.Reader.resources, imageCacheLimit),
 	}
 	state.resetFonts()
 	r.backendStates[key] = state
@@ -150,9 +189,10 @@ func (r *Renderer) canvasState() *canvasBackendState {
 
 // resetFonts 清除Canvas字体及字形缓存，保留编码图片适配对象
 func (s *canvasBackendState) resetFonts() {
+	s.textGlyphPathCache.clear()
 	s.fontMap = make(map[string]*canvas.FontFamily)
 	s.svgFontCache = make(map[*canvas.Font]SVGFont)
-	s.textGlyphPathCache = renderCache[textGlyphPathCacheKey, textGlyphPathCacheValue]{limit: 16 << 20}
+	s.textGlyphPathCache = *resourceCache[textGlyphPathCacheKey, textGlyphPathCacheValue](s.resources, 16<<20)
 	s.fontOutlines = make(map[*canvas.Font]*basefont.Outliner)
 }
 
@@ -189,14 +229,14 @@ func canvasGeometryDigest(paths ...*canvas.Path) [32]byte {
 // 返回: *canvas.Path 规范化填充轮廓
 func (r *Renderer) settleCanvasPath(path *canvas.Path, rule canvas.FillRule) *canvas.Path {
 	if len(path.Data()) < 256 {
-		return path.Settle(rule)
+		return settleCanvasPath(path, rule)
 	}
 	key := canvasFillKey{digest: canvasGeometryDigest(path), rule: rule}
 	cache := r.canvasSettledPaths()
 	if result, ok := cache.get(key); ok {
 		return result.Copy()
 	}
-	result := path.Settle(rule)
+	result := settleCanvasPath(path, rule)
 	if cost := len(result.Data())*8 + 256; cost <= cache.limit {
 		cache.put(key, result.Copy(), cost)
 	}

ofdgo_renderer_svg_canvas.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/base64"
+	"encoding/binary"
 	"fmt"
 	"html"
 	"image"
@@ -59,6 +60,16 @@ type svgImageKey struct {
 	size  image.Point
 }
 
+// svgResourceCacheKey 区分共享的图片编码缓存
+type svgResourceCacheKey struct{}
+
+// svgImageResourceKey 按像素、压缩策略及目标尺寸区分编码结果
+type svgImageResourceKey struct {
+	digest  [32]byte
+	options CompressionOptions
+	target  image.Point
+}
+
 // svgObjectGroup 记录编辑分组的稳定路径，不把底纹内部绘制当作成员
 type svgObjectGroup struct {
 	path      string
@@ -66,6 +77,59 @@ type svgObjectGroup struct {
 	composite bool
 }
 
+// svgImageResources 获取派生渲染器共享的图片编码缓存
+// 返回: *renderCache 图片编码缓存
+func (r *Renderer) svgImageResources() *renderCache[svgImageResourceKey, SVGImage] {
+	key := svgResourceCacheKey{}
+	if state, ok := r.sharedBackendStates[key]; ok {
+		return state.(*renderCache[svgImageResourceKey, SVGImage])
+	}
+	cache := resourceCache[svgImageResourceKey, SVGImage](r.Reader.resources, 4<<20)
+	r.sharedBackendStates[key] = cache
+	return cache
+}
+
+// svgPixelDigest 对标准像素缓冲计算完整摘要，不展开延迟图像
+// 入参: ctx 取消上下文, img 原始图像, limit 可参与缓存的像素字节上限
+// 返回: [32]byte 像素摘要, bool 是否为支持的像素布局
+func svgPixelDigest(ctx context.Context, img image.Image, limit int) ([32]byte, bool) {
+	var pixels []byte
+	var stride, kind int
+	switch source := img.(type) {
+	case *image.NRGBA:
+		pixels, stride, kind = source.Pix, source.Stride, 1
+	case *image.NRGBA64:
+		pixels, stride, kind = source.Pix, source.Stride, 2
+	case *image.RGBA:
+		pixels, stride, kind = source.Pix, source.Stride, 3
+	case *image.RGBA64:
+		pixels, stride, kind = source.Pix, source.Stride, 4
+	default:
+		return [32]byte{}, false
+	}
+	if len(pixels) > limit {
+		return [32]byte{}, false
+	}
+	bounds := img.Bounds()
+	var header [48]byte
+	for i, value := range [...]int{kind, stride, bounds.Min.X, bounds.Min.Y, bounds.Max.X, bounds.Max.Y} {
+		binary.LittleEndian.PutUint64(header[i*8:], uint64(value))
+	}
+	hash := sha256.New()
+	hash.Write(header[:])
+	for len(pixels) > 0 {
+		if ctx.Err() != nil {
+			return [32]byte{}, false
+		}
+		count := min(len(pixels), 256<<10)
+		hash.Write(pixels[:count])
+		pixels = pixels[count:]
+	}
+	var digest [32]byte
+	hash.Sum(digest[:0])
+	return digest, true
+}
+
 // RenderImage 按输出策略编码图片，分离资源时保持尺寸和变换
 // 入参: img 图片对象, m 变换矩阵
 func (s *svgResourceRenderer) RenderImage(img image.Image, m canvas.Matrix) {
@@ -134,11 +198,33 @@ func (s *svgResourceRenderer) RenderImage(img image.Image, m canvas.Matrix) {
 	}
 }
 
-// imageResource 保留原编码或压缩已解码像素，先降采样再编码并响应取消
+// imageResource 复用相同像素的编码结果，不持有源图像或改变输出策略
-// 优化失败时回退原图PNG，取消时终止，不改变SVG中的图片尺寸和变换
 // 入参: ctx 取消上下文, img 原图, target 压缩像素需求
 // 返回: SVGImage 图片资源, error 编码或取消错误
 func (s *svgResourceRenderer) imageResource(ctx context.Context, img image.Image, target image.Point) (SVGImage, error) {
+	if err := ctx.Err(); err != nil {
+		return SVGImage{}, err
+	}
+	if s.renderer != nil {
+		cache := s.renderer.svgImageResources()
+		if digest, ok := svgPixelDigest(ctx, img, cache.limit); ok {
+			key := svgImageResourceKey{digest: digest, options: s.renderer.Compression, target: target}
+			result, err := cache.load(ctx, key, func() (SVGImage, int, error) {
+				result, err := s.encodeImageResource(ctx, img, target)
+				return result, cap(result.Data) + 256, err
+			})
+			result.Data = bytes.Clone(result.Data)
+			return result, err
+		}
+	}
+	return s.encodeImageResource(ctx, img, target)
+}
+
+// encodeImageResource 保留原编码或压缩已解码像素，先降采样再编码并响应取消
+// 优化失败时回退原图PNG，取消时终止，不改变SVG中的图片尺寸和变换
+// 入参: ctx 取消上下文, img 原图, target 压缩像素需求
+// 返回: SVGImage 图片资源, error 编码或取消错误
+func (s *svgResourceRenderer) encodeImageResource(ctx context.Context, img image.Image, target image.Point) (SVGImage, error) {
 	options := CompressionOptions{}
 	if s.renderer != nil {
 		options = s.renderer.Compression

ofdgo_renderer_text_canvas.go

@@ -170,7 +170,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 			}
 			m := canvas.Matrix{{boundaryCTM.a, -boundaryCTM.c, boundaryCTM.e}, {-boundaryCTM.b, boundaryCTM.d, pageH - boundaryCTM.f}}
 			path := canvas.Rectangle(box.W, box.H).Translate(0, -box.H).Transform(m)
-			box = textPathBox(applyClipPath(path, clipPath), pageH)
+			box = textPathBox(r.applyCachedClipPath(path, clipPath), pageH)
 			for i := range textRun.Boxes {
 				textRun.Boxes[i] = box
 			}
@@ -292,7 +292,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 						m = m.Mul(glyphMatrix)
 					}
 					path := glyphPath.Copy().Transform(m.Scale(scaleX, 1))
-					box := textPathBox(applyClipPath(path, clipPath), pageH)
+					box := textPathBox(r.applyCachedClipPath(path, clipPath), pageH)
 					for j := spans[i][0]; j < spans[i][1]; j++ {
 						textRun.Boxes[textPos+j] = unionTextBox(textRun.Boxes[textPos+j], box)
 					}
@@ -321,7 +321,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 					r.drawShdPath(ctx, applyClipPath(path.Copy(), fillClip), fillView)
 				}
 				path = r.strokeDashedCanvasPath(path, strokeStyle.lineWidth, strokeStyle.lineCap, strokeStyle.lineJoin, strokeStyle.dashOffset, strokeStyle.dashPattern, false)
-				path = applyClipPath(path, strokeClip)
+				path = r.applyCachedClipPath(path, strokeClip)
 				if strokeStyle.strokePattern != nil {
 					r.renderPattern(ctx, strokeStyle.strokePattern, pageH, path, objectCTM)
 				} else {
@@ -378,7 +378,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 					if useTextMatrix {
 						textTransform = textTransform.Mul(glyphMatrix)
 					}
-					glyphPath = applyClipPath(glyphPath.Copy().Transform(textTransform.Scale(scaleX, 1)), glyphClip)
+					glyphPath = r.applyCachedClipPath(glyphPath.Copy().Transform(textTransform.Scale(scaleX, 1)), glyphClip)
 					if fillPattern != nil {
 						r.renderPattern(ctx, fillPattern, pageH, glyphPath, objectCTM)
 					} else {

ofdgo_writer.go

@@ -76,7 +76,7 @@ type fileOutput struct {
 type editorSnapshotArchive struct {
 	files    []*zip.File
 	archive  weak.Pointer[zip.Reader]
-	retained *zip.Reader
+	retained *renderCache[int, *zip.Reader]
 }
 
 // editorSnapshotBuffer 分块保存压缩数据，写入完成后支持并发随机读取
@@ -121,7 +121,7 @@ func (e *Editor) Snapshot(ctx context.Context) (*Editor, error) {
 		return nil, err
 	}
 	defer reader.Close()
-	next := &Reader{files: make(map[string][]byte, len(reader.files)), encryption: reader.encryption, documentIndex: reader.documentIndex, selectedVersion: cloneEditorData(reader.selectedVersion)}
+	next := &Reader{files: make(map[string][]byte, len(reader.files)), encryption: reader.encryption, documentIndex: reader.documentIndex, selectedVersion: cloneEditorData(reader.selectedVersion), resources: e.runtimeResources}
 	if reader.encryption != nil {
 		next.encryption = &encryptionState{info: cloneEditorData(reader.encryption.info), options: cloneEncryptionOptions(reader.encryption.options)}
 	}
@@ -157,6 +157,11 @@ func (e *Editor) copySnapshotArchive(ctx context.Context, source *zip.Reader) (*
 		return nil, err
 	}
 	if cached := e.snapshotArchive; cached != nil && slices.Equal(cached.files, source.File) {
+		if cached.retained != nil {
+			if archive, ok := cached.retained.get(0); ok {
+				return archive, nil
+			}
+		}
 		if archive := cached.archive.Value(); archive != nil {
 			return archive, nil
 		}
@@ -183,8 +188,14 @@ func (e *Editor) copySnapshotArchive(ctx context.Context, source *zip.Reader) (*
 		return nil, err
 	}
 	cached := &editorSnapshotArchive{files: slices.Clone(source.File), archive: weak.Make(reader)}
-	if len(data.chunks) <= editorSnapshotArchiveLimit/editorSnapshotChunkSize {
+	limit := int64(editorSnapshotArchiveLimit)
-		cached.retained = reader
+	if e.runtimeResources != nil {
+		limit = e.runtimeResources.options.SnapshotBytes
+	}
+	if int64(len(data.chunks)) <= limit/editorSnapshotChunkSize {
+		cached.retained = resourceCache[int, *zip.Reader](e.runtimeResources, editorSnapshotArchiveLimit)
+		cached.retained.limit = int(min(limit, int64(int(^uint(0)>>1)-1)))
+		cached.retained.put(0, reader, len(data.chunks)*editorSnapshotChunkSize)
 	}
 	e.snapshotArchive = cached
 	return reader, nil
@@ -530,7 +541,7 @@ func (e *Editor) readerContext(ctx context.Context, progress editorProgress) (*R
 	if e.source != nil {
 		return e.sourceReader(ctx, progress)
 	}
-	r := &Reader{files: make(map[string][]byte), encryption: e.encryption}
+	r := &Reader{files: make(map[string][]byte), encryption: e.encryption, resources: e.runtimeResources}
 	if err := e.writeParts(ctx, func(name string, data []byte, _ bool) error {
 		r.files[name] = data
 		return nil
@@ -562,7 +573,7 @@ func (e *Editor) resourceReader() (*Reader, error) {
 	if err := e.validate(); err != nil {
 		return nil, err
 	}
-	r := &Reader{files: make(map[string][]byte)}
+	r := &Reader{files: make(map[string][]byte), resources: e.runtimeResources}
 	if err := e.writePartsWithPages(ctx, func(name string, data []byte, _ bool) error {
 		r.files[name] = data
 		return nil