feat(字体渲染): 修复字体引用与渲染

ofdgo_editor.go

@@ -1080,6 +1080,9 @@ func scaleTextNumbers(value string, scale float64) string {
 // 入参: obj 文字对象
 // 返回: error 错误信息
 func (e *Editor) prepareText(obj *TextObject) error {
+	if id := editorResourceID(obj.Font); id != "" {
+		obj.Font = id
+	}
 	var sfnt FontMetrics
 	external := false
 	for _, resource := range e.resources {

ofdgo_editor_open.go

@@ -179,13 +179,16 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 // 入参: id 字体资源标识
 // 返回: []byte 独立字体数据, error 错误信息
 func (e *Editor) FontData(id string) ([]byte, error) {
+	if key := editorResourceID(id); key != "" {
+		id = key
+	}
 	for _, resource := range e.resources {
 		if resource.font != nil && resource.font.ID == id && len(resource.data) != 0 {
 			return bytes.Clone(resource.data), nil
 		}
 	}
 	if e.source != nil {
-		if definition := e.source.reader.fontCache[id]; definition != nil && definition.FontFile != "" {
+		if definition := e.source.reader.fontDefinition(id); definition != nil && definition.FontFile != "" {
 			return e.source.reader.FontData(id)
 		}
 	}
@@ -799,6 +802,9 @@ func editorGeometry(object GraphicObject) (string, string) {
 // 入参: id 字体资源标识
 // 返回: FontMetrics 字体度量, error 错误信息
 func (e *Editor) editorFont(id string) (FontMetrics, error) {
+	if key := editorResourceID(id); key != "" {
+		id = key
+	}
 	if metrics := e.fontMetrics[id]; metrics != nil {
 		return metrics, nil
 	}

ofdgo_font_backend.go

@@ -146,12 +146,18 @@ func (r *Renderer) ResolveFont(id string, exact bool) (ResolvedFont, error) {
 	if r.backends.Fonts == nil {
 		return ResolvedFont{}, fmt.Errorf("fonts: %w", ErrBackendUnavailable)
 	}
-	key := resolvedFontKey{id: id, exact: exact, definition: r.Reader.fontCache[id]}
+	key := resolvedFontKey{id: id, exact: exact, definition: r.Reader.fontDefinition(id)}
+	if key.definition != nil && key.definition.ID != "" {
+		key.id = key.definition.ID
+	}
 	if cached, ok := r.resolvedFonts[key]; ok {
 		return cached.font, cached.err
 	}
-	resolved, err := r.backends.Fonts.ResolveFont(r, id, exact)
-	key.definition = r.Reader.fontCache[id]
+	resolved, err := r.backends.Fonts.ResolveFont(r, key.id, exact)
+	key.definition = r.Reader.fontDefinition(id)
+	if key.definition != nil && key.definition.ID != "" {
+		key.id = key.definition.ID
+	}
 	r.resolvedFonts[key] = resolvedFontResult{font: resolved, err: err}
 	return resolved, err
 }
@@ -161,6 +167,9 @@ func (r *Renderer) ResolveFont(id string, exact bool) (ResolvedFont, error) {
 // 入参: id 字体资源标识
 // 返回: *PreparedFont 绘制字体, error 字体解析错误
 func (r *Renderer) PrepareFont(id string) (*PreparedFont, error) {
+	if definition := r.Reader.fontDefinition(id); definition != nil && definition.ID != "" {
+		id = definition.ID
+	}
 	if cached := r.preparedFonts[id]; cached != nil {
 		return cached, nil
 	}
@@ -168,8 +177,11 @@ func (r *Renderer) PrepareFont(id string) (*PreparedFont, error) {
 	if err != nil {
 		return nil, err
 	}
+	definition := r.Reader.fontDefinition(id)
+	if definition != nil && definition.ID != "" {
+		id = definition.ID
+	}
 	prepared := &PreparedFont{ResolvedFont: resolved}
-	definition := r.Reader.fontCache[id]
 	if definition != nil && definition.FontFile != "" {
 		key := r.fontDigest(resolved.Data)
 		if content, ok := r.fontPreparations.get(key); ok {

ofdgo_font_fs.go

@@ -262,7 +262,7 @@ func (r *Reader) MatchFontFiles(files []string, ids ...string) ([]string, error)
 		return nil, err
 	}
 	for _, id := range ids {
-		if r.fontCache[id] == nil {
+		if r.fontDefinition(id) == nil {
 			fonts = append(fonts, Font{ID: id})
 		}
 	}

ofdgo_font_info.go

@@ -111,12 +111,12 @@ func (r *Reader) FontData(id string) ([]byte, error) {
 // 入参: id 字体资源标识, readonly 是否允许借用只读资源
 // 返回: []byte 字体数据, error 资源或集合错误
 func (r *Reader) fontData(id string, readonly bool) ([]byte, error) {
-	if r.fontCache[id] == nil {
+	if r.fontDefinition(id) == nil {
 		if _, err := r.Fonts(); err != nil {
 			return nil, err
 		}
 	}
-	f := r.fontCache[id]
+	f := r.fontDefinition(id)
 	if f == nil || f.FontFile == "" {
 		return nil, fmt.Errorf("embedded font %q not found", id)
 	}
@@ -135,6 +135,14 @@ func (r *Reader) fontData(id string, readonly bool) ([]byte, error) {
 	return data, nil
 }
 
+// fontDefinition 按资源标识查找已加载的字体，数值等价的引用共用同一定义
+// 入参: id 字体资源标识
+// 返回: *Font 字体定义，未找到或别名冲突时为nil
+func (r *Reader) fontDefinition(id string) *Font {
+	font, _ := resourceValue(r.fontCache, id)
+	return font
+}
+
 // FontInfos 获取OFD字体诊断信息
 // 返回: []FontInfo 字体诊断列表, error 错误信息
 func (r *Renderer) FontInfos() ([]FontInfo, error) {
@@ -293,6 +301,14 @@ func (r *Renderer) fontInfos(usage map[string]int) ([]FontInfo, error) {
 	if err != nil {
 		return nil, err
 	}
+	counts := make(map[string]int, len(usage))
+	for id, used := range usage {
+		if font := r.Reader.fontDefinition(id); font != nil {
+			id = font.ID
+		}
+		counts[id] += used
+	}
+	usage = counts
 	infos := make([]FontInfo, 0, len(fonts)+len(usage))
 	seen := make(map[string]bool)
 	for _, font := range fonts {

ofdgo_font_source.go

@@ -158,12 +158,12 @@ func (r *Renderer) fontSourceMatch(backend FontBackend, fontID string, definitio
 // 入参: backend 字体后端, id 字体ID, exact 是否禁止无关回退
 // 返回: ResolvedFont 字体及来源, error 解析错误
 func (r *Renderer) resolveFontSource(backend FontBackend, id string, exact bool) (ResolvedFont, error) {
-	definition := r.Reader.fontCache[id]
+	definition := r.Reader.fontDefinition(id)
 	if definition == nil && !r.Reader.fontResourcesRead && r.Reader.OFD != nil {
 		if _, err := r.Reader.Fonts(); err != nil {
 			return ResolvedFont{}, err
 		}
-		definition = r.Reader.fontCache[id]
+		definition = r.Reader.fontDefinition(id)
 	}
 	if definition == nil {
 		definition = &Font{ID: id}

ofdgo_render_text.go

@@ -118,7 +118,7 @@ func (r *Renderer) PositionText(object TextObject, state RenderState) (*Position
 		italic = italic || defaults.Italic
 	}
 	bold := weight >= 700
-	if definition := r.Reader.fontCache[id]; definition != nil {
+	if definition := r.Reader.fontDefinition(id); definition != nil {
 		bold = bold && !definition.Bold
 		if definition.FontFile == "" && fontNoSyntheticBold(definition.FontName, definition.FamilyName) {
 			bold = false

ofdgo_renderer_font_loader_canvas.go

@@ -32,7 +32,7 @@ func (r *Renderer) loadFont(fontID string) *canvas.FontFamily {
 		r.renderError = err
 		return nil
 	}
-	of := r.Reader.fontCache[fontID]
+	of := r.Reader.fontDefinition(fontID)
 	if len(resolved.Data) == 0 {
 		return nil
 	}

ofdgo_renderer_text_canvas.go

@@ -142,7 +142,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 	}
 	fontID := r.textObjectFontID(obj)
 	embeddedFont := false
-	if of, ok := r.Reader.fontCache[fontID]; ok {
+	if of := r.Reader.fontDefinition(fontID); of != nil {
 		embeddedFont = of.FontFile != ""
 		if syntheticBold && !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
 			syntheticBold = false