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perf(双端优化): 优化双端加载与资源复用
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xiaoqidun committed 2026-10-19 20:34:17 +08:00
1 parent 010ab9f314
commit 66aa87304b
10 files changed
+365 -79
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internal/webui/webui.go
+82 -34
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@@ -313,6 +313,7 @@ type exportWriter struct {
// browserReaderAt 分块读取浏览器文件，只缓存最近的一个数据块
type browserReaderAt struct {
mu sync.Mutex
read platformValue
checkpoint platformValue
size int64
@@ -461,14 +462,14 @@ func (s *Session) Close() error {
return nil
}
reader := s.Reader
source := s.input
input := s.input
*s = Session{}
var err error
if reader != nil {
err = reader.Close()
}
if source != nil {
err = errors.Join(err, source.Close())
if input != nil {
err = errors.Join(err, input.Close())
}
return err
}
@@ -744,6 +745,13 @@ func (s *Session) RenderPageSVG(index int) (PageSVG, error) {
// 入参: index 页面索引, backend 后端组合，空值沿用会话配置, dpi 光栅分辨率, raster 是否光栅显示
// 返回: PageSVG 页面结果, error 错误信息
func (s *Session) RenderPage(index int, backend string, dpi float64, raster bool) (PageSVG, error) {
return s.renderPage(index, backend, dpi, raster, false, nil)
}
// renderPage 按需生成预览及交互数据，省略调用方已持有的资源字节
// 入参: index 页面索引, backend 后端组合, dpi 光栅分辨率, raster 光栅显示, preview 仅预览, known 已持有资源
// 返回: PageSVG 页面结果, error 渲染错误
func (s *Session) renderPage(index int, backend string, dpi float64, raster, preview bool, known map[string]bool) (PageSVG, error) {
if backend != "" {
if err := s.SetRenderBackend(backend); err != nil {
return PageSVG{}, err
@@ -759,7 +767,7 @@ func (s *Session) RenderPage(index int, backend string, dpi float64, raster bool
}
var buf bytes.Buffer
renderer := *s.Renderer
if s.cachedPageText(index) == nil {
if !preview && s.cachedPageText(index) == nil {
renderer.OnPageText = func(_ *ofdgo.PageContent, text *ofdgo.PageText) {
s.cachePageText(index, text)
}
@@ -767,10 +775,18 @@ func (s *Session) RenderPage(index int, backend string, dpi float64, raster bool
if raster {
renderer.DPI = dpi
}
resources, err := renderer.RenderPreview(page, &buf, ofdgo.PreviewOptions{Raster: raster, Objects: !raster && s.editing})
resources, err := renderer.RenderPreview(page, &buf, ofdgo.PreviewOptions{Raster: raster, Objects: !raster && s.editing && !preview, KnownResources: known})
if err != nil {
return PageSVG{}, err
}
clear(s.svgFonts)
for i, font := range resources.Fonts {
s.svgFonts[font.Name] = font.Data
resources.Fonts[i].Data = nil
}
if preview {
return PageSVG{Index: index, Number: index + 1, ID: page.ID, Width: box.W, Height: box.H, SVG: buf.String(), Fonts: resources.Fonts, Images: resources.Images}, nil
}
links, err := s.Renderer.PageLinks(page)
if err != nil {
return PageSVG{}, err
@@ -790,11 +806,6 @@ func (s *Session) RenderPage(index int, backend string, dpi float64, raster bool
annotations[i].Bounds, annotations[i].Contours = bounds, contours
}
}
clear(s.svgFonts)
for i, font := range resources.Fonts {
s.svgFonts[font.Name] = font.Data
resources.Fonts[i].Data = nil
}
return PageSVG{Index: index, Number: index + 1, ID: page.ID, Width: box.W, Height: box.H, SVG: buf.String(), Links: links, Fonts: resources.Fonts, Images: resources.Images, Annotations: annotations}, nil
}
@@ -1282,26 +1293,21 @@ func (r *browserReaderAt) ReadAt(data []byte, offset int64) (int, error) {
if offset >= r.size {
return n, io.EOF
}
if time.Since(r.checked) >= 50*time.Millisecond {
r.mu.Lock()
check := r.checkpoint.Type() == platformTypeFunction && time.Since(r.checked) >= 50*time.Millisecond
if check {
r.checked = time.Now()
}
r.mu.Unlock()
if check {
if err := awaitExport(r.checkpoint); err != nil {
return n, err
}
r.checked = time.Now()
}
if len(r.data) == 0 || offset < r.offset || offset-r.offset >= int64(len(r.data)) {
r.offset = offset / (256 << 10) * (256 << 10)
size := int(min(int64(256<<10), r.size-r.offset))
if cap(r.data) < size {
r.data = make([]byte, size)
} else {
r.data = r.data[:size]
}
value := r.read.Invoke(float64(r.offset), size)
if platformCopyBytes(r.data, value) != size {
return n, io.ErrUnexpectedEOF
}
copied, err := r.readChunk(data, offset)
if err != nil {
return n, err
}
copied := copy(data, r.data[offset-r.offset:])
n += copied
offset += int64(copied)
data = data[copied:]
@@ -1309,6 +1315,31 @@ func (r *browserReaderAt) ReadAt(data []byte, offset int64) (int, error) {
return n, nil
}
// readChunk 串行读取和复用缓存块，仅保留完整读取的内容
// 入参: data 目标缓冲, offset 文件内偏移
// 返回: int 复制字节数, error 读取错误
func (r *browserReaderAt) readChunk(data []byte, offset int64) (int, error) {
r.mu.Lock()
defer r.mu.Unlock()
if len(r.data) == 0 || offset < r.offset || offset-r.offset >= int64(len(r.data)) {
start := offset / (256 << 10) * (256 << 10)
size := int(min(int64(256<<10), r.size-start))
buffer := r.data
r.data = nil
if cap(buffer) < size {
buffer = make([]byte, size)
} else {
buffer = buffer[:size]
}
value := r.read.Invoke(float64(start), size)
if platformCopyBytes(buffer, value) != size {
return 0, io.ErrUnexpectedEOF
}
r.offset, r.data = start, buffer
}
return copy(data, r.data[offset-r.offset:]), nil
}
// renderBackends 返回库提供的内置后端能力
// 入参: args 浏览器参数
// 返回: any 后端能力, error 错误信息
@@ -2440,7 +2471,7 @@ func (e *businessEngine) svgFontData(args []platformValue) (any, error) {
}
// renderPage 渲染OFD页面
// 入参: args 页面索引、后端组合、DPI和光栅显示开关
// 入参: args 页面索引、后端组合、DPI、光栅开关、已持有字体和图片、仅预览开关
// 返回: any 页面SVG结果, error 错误信息
func (e *businessEngine) renderPage(args []platformValue) (any, error) {
if e.currentSession == nil {
@@ -2457,6 +2488,13 @@ func (e *businessEngine) renderPage(args []platformValue) (any, error) {
dpi = args[2].Float()
}
raster := len(args) > 3 && args[3].Bool()
preview := len(args) > 6 && args[6].Bool()
known := make(map[string]bool)
for i := 4; i < min(len(args), 6); i++ {
for j := 0; j < args[i].Length(); j++ {
known[args[i].Index(j).String()] = true
}
}
if e.currentEditor != nil {
page, err := e.currentEditor.Page(args[0].Int())
if err != nil {
@@ -2466,24 +2504,30 @@ func (e *businessEngine) renderPage(args []platformValue) (any, error) {
return nil, err
}
}
page, err := e.currentSession.RenderPage(args[0].Int(), backend, dpi, raster)
page, err := e.currentSession.renderPage(args[0].Int(), backend, dpi, raster, preview, known)
if err != nil {
return nil, err
}
if e.currentEditor != nil && !reflect.DeepEqual(e.currentEditor.Backends(), e.currentSession.Renderer.Backends()) {
e.currentEditor.SetRenderBackends(e.currentSession.Renderer.Backends())
}
text, err := e.currentSession.PageText(args[0].Int())
if err != nil {
return nil, err
text := &ofdgo.PageText{}
if !preview {
text, err = e.currentSession.PageText(args[0].Int())
if err != nil {
return nil, err
}
}
textData, err := json.Marshal(text)
if err != nil {
return nil, err
}
objects, err := e.editorObjects(args[0].Int(), text)
if err != nil {
return nil, err
var objects []any
if !preview {
objects, err = e.editorObjects(args[0].Int(), text)
if err != nil {
return nil, err
}
}
links, err := e.linkResults(page.Links)
if err != nil {
@@ -2492,12 +2536,16 @@ func (e *businessEngine) renderPage(args []platformValue) (any, error) {
fonts := make([]any, len(page.Fonts))
for i, font := range page.Fonts {
fonts[i] = map[string]any{"name": font.Name, "weight": font.Weight, "style": font.Style}
if len(args) > 4 && !known[font.Name] {
fonts[i].(map[string]any)["data"] = bytesToJS(e.currentSession.svgFonts[font.Name])
}
}
annotations, err := json.Marshal(page.Annotations)
if err != nil {
return nil, err
}
return successResult(map[string]any{
"previewOnly": preview,
"annotations": string(annotations),
"index": page.Index,
"number": page.Number,
@@ -5502,7 +5550,7 @@ func (e *businessEngine) clearImport() {
}
// loadImport 加载待导入文件的索引，null参数清除待处理文件
// 入参: args OFD字节数组或null
// 入参: args 文档输入或null及可选凭据
// 返回: any 文档列表、页数及签名提示, error 错误信息
func (e *businessEngine) loadImport(args []platformValue) (any, error) {
e.clearImport()