feat(转换能力): 修复PDF转换系统字体加载

assets/webui/ofdgo.js

@@ -3253,10 +3253,23 @@ async function loadWASM() {
 		};
 		worker.onerror = (event) => fail(new Error(event.message || "引擎加载失败"));
 		worker.onmessageerror = () => fail(new Error("引擎通信失败"));
-		worker.onmessage = ({ data }) => {
+		worker.onmessage = async ({ data }) => {
 			if (worker !== wasmWorker) {
 				return;
 			}
+			if (data.type === "font") {
+				try {
+					const request = wasmRequests.get(data.id);
+					const font = request?.localFonts?.get(data.name);
+					if (!font || request.openSeq !== state.openSeq) throw new Error("系统字体不可用");
+					if (!request.fontData.has(font)) request.fontData.set(font, fontManager.read(font));
+					const bytes = await request.fontData.get(font);
+					if (worker === wasmWorker) worker.postMessage({ type: "font", request: data.request, bytes });
+				} catch (err) {
+					if (worker === wasmWorker) worker.postMessage({ type: "font", request: data.request, error: err.message });
+				}
+				return;
+			}
 			if (data.type === "progress") {
 				setProgress(data.text, data.percent);
 			} else if (data.type === "conversion") {
@@ -7939,6 +7952,12 @@ async function callWASM(name, ...args) {
 	return new Promise((resolve, reject) => {
 		const id = ++wasmRequestID;
 		wasmRequests.set(id, { resolve, reject, openSeq: state.openSeq });
+		if (name === "ofdgoConvertPDF") {
+			const request = wasmRequests.get(id);
+			request.localFonts = fontManager.localEntries();
+			request.fontData = new Map();
+			args.push([...request.localFonts.keys()]);
+		}
 		if (name === "ofdgoConvertPDF" || name === "ofdgoExportPage" || name === "ofdgoExportDocument" || name === "ofdgoExportAttachment" || name === "ofdgoSaveDocument" || name === "ofdgoSaveEncrypted" || name === "ofdgoSaveSigned" || name === "ofdgoImportPages") {
 			state.exportRequestID = id;
 			el.cancelExportButton.hidden = false;

assets/webui/ofdgo_wasm.js

@@ -4,6 +4,21 @@ let pending = Promise.resolve();
 const operations = new Map();
 const fontRequests = new Map();
 let fontSequence = 0;
+
+function requestFont(id, signal, name, done) {
+	if (signal.aborted) { done(null, "", true); return; }
+	const request = ++fontSequence;
+	const cancel = () => {
+		fontRequests.delete(request);
+		done(null, "", true);
+	};
+	signal.addEventListener("abort", cancel, { once: true });
+	fontRequests.set(request, result => {
+		signal.removeEventListener("abort", cancel);
+		done(result.bytes, result.error || "", signal.aborted);
+	});
+	self.postMessage({ id, type: "font", request, name });
+}
 self.onmessage = ({ data }) => {
 	if (data.type === "font") {
 		fontRequests.get(data.request)?.(data);
@@ -103,20 +118,7 @@ async function handleBatchMessage({ id, name, args }) {
 					finish(done);
 				},
 				(action, pageName, done) => boundary(action, pageName).then(() => finish(done), err => finish(done, err)),
-				done => finish(done), fonts, (name, done) => {
-					if (signal.aborted) { done(null, "", true); return; }
-					const request = ++fontSequence;
-					const cancel = () => {
-						fontRequests.delete(request);
-						done(null, "", true);
-					};
-					signal.addEventListener("abort", cancel, { once: true });
-					fontRequests.set(request, result => {
-						signal.removeEventListener("abort", cancel);
-						done(result.bytes, result.error || "", signal.aborted);
-					});
-					self.postMessage({ id, type: "font", request, name });
-				});
+				done => finish(done), fonts, (name, done) => requestFont(id, signal, name, done));
 		} else {
 			const [entries, handle] = args;
 			if (handle) output = await handle.createWritable();
@@ -187,6 +189,7 @@ async function handleMessage({ id, name, args }) {
 					self.postMessage({ id, type: importing ? "import" : "conversion", phase, completed, total });
 					finish(done, null, importing && phase === "commit");
 				});
+				if (converting) args.push((name, done) => requestFont(id, signal, name, done));
 			} else {
 				const file = args.pop();
 				const indices = saving ? args.shift() : null;

internal/webui/wasm.go

@@ -371,10 +371,10 @@ func safeCall(fn func([]js.Value) (any, error), args []js.Value) (data any, err
 }
 
 // convertPDFDocument 通过库转换PDF，不替换当前文档会话
-// 入参: args PDF数据、外部字体、UTF-8密码及进度回调
+// 入参: args PDF数据、外部字体、UTF-8密码、字体目录、进度及字体读取回调
 // 返回: any OFD数据及转换警告, error 错误信息
 func convertPDFDocument(args []js.Value) (any, error) {
-	if len(args) != 4 {
+	if len(args) != 6 {
 		return nil, fmt.Errorf("missing PDF data")
 	}
 	data, err := bytesFromJS(args[0])
@@ -386,7 +386,7 @@ func convertPDFDocument(args []js.Value) (any, error) {
 		return nil, err
 	}
 	var output bytes.Buffer
-	options := ofdgo.PDFImportOptions{OnProgress: editorOperationProgress(args[3]), PasswordUTF8: true}
+	options := ofdgo.PDFImportOptions{OnProgress: editorOperationProgress(args[4]), PasswordUTF8: true}
 	if !args[2].IsNull() && !args[2].IsUndefined() {
 		options.Password, err = bytesFromJS(args[2])
 		if err != nil {
@@ -394,9 +394,13 @@ func convertPDFDocument(args []js.Value) (any, error) {
 		}
 		defer clear(options.Password)
 	}
-	if len(fonts) > 0 {
-		options.RendererOptions = []ofdgo.RendererOption{ofdgo.WithFontFS(ofdgo.NewFontFS(fonts))}
+	fontSources := []fs.FS{ofdgo.NewFontFS(fonts)}
+	if names := stringsFromJS(args[3]); len(names) > 0 {
+		fontSources = append(fontSources, ofdgo.NewLazyFontFS(names, func(name string) ([]byte, error) {
+			return loadConversionFont(args[5], name)
+		}))
 	}
+	options.RendererOptions = []ofdgo.RendererOption{ofdgo.WithFontFS(fontSources...)}
 	report, err := ofdgo.ConvertPDF(context.Background(), bytes.NewReader(data), int64(len(data)), &output, options)
 	if err != nil {
 		return nil, err