Encode FontPath data into an ArrayBuffer

Serialize FontPath commands into a binary format
and store it in an ArrayBuffer so that it can
eventually be stored in a SharedArrayBuffer.

Author: ryzokuken

src/core/evaluator.js

@@ -40,7 +40,11 @@ import {
   lookupMatrix,
   lookupNormalRect,
 } from "./core_utils.js";
-import { FontInfo, PatternInfo } from "../shared/obj-bin-transform.js";
+import {
+  FontInfo,
+  FontPathInfo,
+  PatternInfo,
+} from "../shared/obj-bin-transform.js";
 import {
   getEncoding,
   MacRomanEncoding,
@@ -4663,11 +4667,8 @@ class PartialEvaluator {
         if (font.renderer.hasBuiltPath(fontChar)) {
           return;
         }
-        handler.send("commonobj", [
-          glyphName,
-          "FontPath",
-          font.renderer.getPathJs(fontChar),
-        ]);
+        const buffer = FontPathInfo.write(font.renderer.getPathJs(fontChar));
+        handler.send("commonobj", [glyphName, "FontPath", buffer], [buffer]);
       } catch (reason) {
         if (evaluatorOptions.ignoreErrors) {
           warn(`buildFontPaths - ignoring ${glyphName} glyph: "${reason}".`);

src/display/api.js

@@ -45,7 +45,11 @@ import {
   StatTimer,
 } from "./display_utils.js";
 import { FontFaceObject, FontLoader } from "./font_loader.js";
-import { FontInfo, PatternInfo } from "../shared/obj-bin-transform.js";
+import {
+  FontInfo,
+  FontPathInfo,
+  PatternInfo,
+} from "../shared/obj-bin-transform.js";
 import {
   getDataProp,
   getFactoryUrlProp,
@@ -2803,6 +2807,8 @@ class WorkerTransport {
           }
           break;
         case "FontPath":
+          this.commonObjs.resolve(id, new FontPathInfo(exportedData));
+          break;
         case "Image":
           this.commonObjs.resolve(id, exportedData);
           break;

src/display/font_loader.js

@@ -436,7 +436,7 @@ class FontFaceObject {
     } catch (ex) {
       warn(`getPathGenerator - ignoring character: "${ex}".`);
     }
-    const path = makePathFromDrawOPS(cmds);
+    const path = makePathFromDrawOPS(cmds.path);
 
     if (!this.fontExtraProperties) {
       // Remove the raw path-string, since we don't need it anymore.

src/shared/obj-bin-transform.js

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { assert, MeshFigureType } from "./util.js";
+import { assert, FeatureTest, MeshFigureType } from "./util.js";
 
 class CssFontInfo {
   #buffer;
@@ -881,4 +881,39 @@ class PatternInfo {
     throw new Error(`Unsupported pattern kind: ${kind}`);
   }
 }
-export { CssFontInfo, FontInfo, PatternInfo, SystemFontInfo };
+
+class FontPathInfo {
+  static write(path) {
+    let data;
+    let buffer;
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
+      buffer = new ArrayBuffer(path.length * 2);
+      data = new Float32Array(buffer);
+    } else if (FeatureTest.isFloat16ArraySupported) {
+      buffer = new ArrayBuffer(path.length * 2);
+      data = new Float16Array(buffer);
+    } else {
+      buffer = new ArrayBuffer(path.length * 4);
+      data = new Float32Array(buffer);
+    }
+    data.set(path);
+    return buffer;
+  }
+
+  #buffer;
+
+  constructor(buffer) {
+    this.#buffer = buffer;
+  }
+
+  get path() {
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
+      return new Float16Array(this.#buffer);
+    }
+    return FeatureTest.isFloat16ArraySupported
+      ? new Float16Array(this.#buffer)
+      : new Float32Array(this.#buffer);
+  }
+}
+
+export { CssFontInfo, FontInfo, FontPathInfo, PatternInfo, SystemFontInfo };