Merge pull request #19563 from Snuffleupagus/loadType3Data-once

Invoke `TranslatedFont.prototype.loadType3Data` only *once* per font

Author: Snuffleupagus

src/core/catalog.js

@@ -1177,9 +1177,7 @@ class Catalog {
     this.pageDictCache.clear();
     this.nonBlendModesSet.clear();
 
-    const translatedFonts = await Promise.all(this.fontCache);
-
-    for (const { dict } of translatedFonts) {
+    for (const { dict } of await Promise.all(this.fontCache)) {
       delete dict.cacheKey;
     }
     this.fontCache.clear();

src/core/evaluator.js

@@ -1046,27 +1046,19 @@ class PartialEvaluator {
   ) {
     const fontName = fontArgs?.[0] instanceof Name ? fontArgs[0].name : null;
 
-    let translated = await this.loadFont(
+    const translated = await this.loadFont(
       fontName,
       fontRef,
       resources,
+      task,
       fallbackFontDict,
       cssFontInfo
     );
 
     if (translated.font.isType3Font) {
-      try {
-        await translated.loadType3Data(this, resources, task);
-        // Add the dependencies to the parent operatorList so they are
-        // resolved before Type3 operatorLists are executed synchronously.
-        operatorList.addDependencies(translated.type3Dependencies);
-      } catch (reason) {
-        translated = new TranslatedFont({
-          loadedName: "g_font_error",
-          font: new ErrorFont(`Type3 font load error: ${reason}`),
-          dict: translated.font,
-        });
-      }
+      // Add the dependencies to the parent operatorList so they are
+      // resolved before Type3 operatorLists are executed synchronously.
+      operatorList.addDependencies(translated.type3Dependencies);
     }
 
     state.font = translated.font;
@@ -1228,6 +1220,7 @@ class PartialEvaluator {
     fontName,
     font,
     resources,
+    task,
     fallbackFontDict = null,
     cssFontInfo = null
   ) {
@@ -1356,14 +1349,21 @@ class PartialEvaluator {
     font.loadedName = `${this.idFactory.getDocId()}_${fontID}`;
 
     this.translateFont(preEvaluatedFont)
-      .then(translatedFont => {
-        resolve(
-          new TranslatedFont({
-            loadedName: font.loadedName,
-            font: translatedFont,
-            dict: font,
-          })
-        );
+      .then(async translatedFont => {
+        const translated = new TranslatedFont({
+          loadedName: font.loadedName,
+          font: translatedFont,
+          dict: font,
+        });
+
+        if (translatedFont.isType3Font) {
+          try {
+            await translated.loadType3Data(this, resources, task);
+          } catch (reason) {
+            throw new Error(`Type3 font load error: ${reason}`);
+          }
+        }
+        resolve(translated);
       })
       .catch(reason => {
         // TODO reject?
@@ -1372,9 +1372,7 @@ class PartialEvaluator {
         resolve(
           new TranslatedFont({
             loadedName: font.loadedName,
-            font: new ErrorFont(
-              reason instanceof Error ? reason.message : reason
-            ),
+            font: new ErrorFont(reason?.message),
             dict: font,
           })
         );
@@ -2616,16 +2614,12 @@ class PartialEvaluator {
     }
 
     async function handleSetFont(fontName, fontRef) {
-      const translated = await self.loadFont(fontName, fontRef, resources);
-
-      if (translated.font.isType3Font) {
-        try {
-          await translated.loadType3Data(self, resources, task);
-        } catch {
-          // Ignore Type3-parsing errors, since we only use `loadType3Data`
-          // here to ensure that we'll always obtain a useful /FontBBox.
-        }
-      }
+      const translated = await self.loadFont(
+        fontName,
+        fontRef,
+        resources,
+        task
+      );
 
       textState.loadedName = translated.loadedName;
       textState.font = translated.font;
@@ -4602,20 +4596,22 @@ class PartialEvaluator {
 }
 
 class TranslatedFont {
+  #sent = false;
+
+  #type3Loaded = null;
+
   constructor({ loadedName, font, dict }) {
     this.loadedName = loadedName;
     this.font = font;
     this.dict = dict;
-    this.type3Loaded = null;
     this.type3Dependencies = font.isType3Font ? new Set() : null;
-    this.sent = false;
   }
 
   send(handler) {
-    if (this.sent) {
+    if (this.#sent) {
       return;
     }
-    this.sent = true;
+    this.#sent = true;
 
     handler.send("commonobj", [
       this.loadedName,
@@ -4645,12 +4641,12 @@ class TranslatedFont {
   }
 
   loadType3Data(evaluator, resources, task) {
-    if (this.type3Loaded) {
-      return this.type3Loaded;
-    }
-    if (!this.font.isType3Font) {
-      throw new Error("Must be a Type3 font.");
+    if (this.#type3Loaded) {
+      return this.#type3Loaded;
     }
+    const { font, type3Dependencies } = this;
+    assert(font.isType3Font, "Must be a Type3 font.");
+
     // When parsing Type3 glyphs, always ignore them if there are errors.
     // Compared to the parsing of e.g. an entire page, it doesn't really
     // make sense to only be able to render a Type3 glyph partially.
@@ -4662,14 +4658,12 @@ class TranslatedFont {
     }
     type3Evaluator.type3FontRefs = type3FontRefs;
 
-    const translatedFont = this.font,
-      type3Dependencies = this.type3Dependencies;
     let loadCharProcsPromise = Promise.resolve();
     const charProcs = this.dict.get("CharProcs");
     const fontResources = this.dict.get("Resources") || resources;
     const charProcOperatorList = Object.create(null);
 
-    const fontBBox = Util.normalizeRect(translatedFont.bbox || [0, 0, 0, 0]),
+    const fontBBox = Util.normalizeRect(font.bbox || [0, 0, 0, 0]),
       width = fontBBox[2] - fontBBox[0],
       height = fontBBox[3] - fontBBox[1];
     const fontBBoxSize = Math.hypot(width, height);
@@ -4693,7 +4687,7 @@ class TranslatedFont {
             //   colour-related parameters) in the graphics state;
             //   any use of such operators shall be ignored."
             if (operatorList.fnArray[0] === OPS.setCharWidthAndBounds) {
-              this._removeType3ColorOperators(operatorList, fontBBoxSize);
+              this.#removeType3ColorOperators(operatorList, fontBBoxSize);
             }
             charProcOperatorList[key] = operatorList.getIR();
 
@@ -4708,20 +4702,17 @@ class TranslatedFont {
           });
       });
     }
-    this.type3Loaded = loadCharProcsPromise.then(() => {
-      translatedFont.charProcOperatorList = charProcOperatorList;
+    this.#type3Loaded = loadCharProcsPromise.then(() => {
+      font.charProcOperatorList = charProcOperatorList;
       if (this._bbox) {
-        translatedFont.isCharBBox = true;
-        translatedFont.bbox = this._bbox;
+        font.isCharBBox = true;
+        font.bbox = this._bbox;
       }
     });
-    return this.type3Loaded;
+    return this.#type3Loaded;
   }
 
-  /**
-   * @private
-   */
-  _removeType3ColorOperators(operatorList, fontBBoxSize = NaN) {
+  #removeType3ColorOperators(operatorList, fontBBoxSize = NaN) {
     if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
       assert(
         operatorList.fnArray[0] === OPS.setCharWidthAndBounds,