Add a pdf.renderer.js entrypoint and gulp function to build renderer

Author: ryzokuken

gulpfile.mjs

@@ -589,6 +589,18 @@ function createWorkerBundle(defines) {
     .pipe(webpack2Stream(workerFileConfig));
 }
 
+function createRendererWorkerBundle(defines) {
+  const rendererWorkerFileConfig = createWebpackConfig(defines, {
+    filename: defines.MINIFIED ? "pdf.renderer.min.mjs" : "pdf.renderer.mjs",
+    library: {
+      type: "module",
+    },
+  });
+  return gulp
+    .src("./src/pdf.renderer.js", { encoding: false })
+    .pipe(webpack2Stream(rendererWorkerFileConfig));
+}
+
 function createWebBundle(defines, options) {
   const viewerFileConfig = createWebpackConfig(
     defines,
@@ -1103,6 +1115,7 @@ function buildGeneric(defines, dir) {
   return ordered([
     createMainBundle(defines).pipe(gulp.dest(dir + "build")),
     createWorkerBundle(defines).pipe(gulp.dest(dir + "build")),
+    createRendererWorkerBundle(defines).pipe(gulp.dest(dir + "build")),
     createSandboxBundle(defines).pipe(gulp.dest(dir + "build")),
     createWebBundle(defines, {
       defaultPreferencesDir: defines.SKIP_BABEL
@@ -1293,6 +1306,7 @@ function buildMinified(defines, dir) {
   return ordered([
     createMainBundle(defines).pipe(gulp.dest(dir + "build")),
     createWorkerBundle(defines).pipe(gulp.dest(dir + "build")),
+    createRendererWorkerBundle(defines).pipe(gulp.dest(dir + "build")),
     createSandboxBundle(defines).pipe(gulp.dest(dir + "build")),
     createImageDecodersBundle({ ...defines, IMAGE_DECODERS: true }).pipe(
       gulp.dest(dir + "image_decoders")
@@ -1438,6 +1452,9 @@ gulp.task(
         createWorkerBundle(defines).pipe(
           gulp.dest(MOZCENTRAL_CONTENT_DIR + "build")
         ),
+        createRendererWorkerBundle(defines).pipe(
+          gulp.dest(MOZCENTRAL_CONTENT_DIR + "build")
+        ),
         createWebBundle(defines, { defaultPreferencesDir: "mozcentral/" }).pipe(
           gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")
         ),
@@ -1535,6 +1552,9 @@ gulp.task(
         createWorkerBundle(defines).pipe(
           gulp.dest(CHROME_BUILD_CONTENT_DIR + "build")
         ),
+        createRendererWorkerBundle(defines).pipe(
+          gulp.dest(CHROME_BUILD_CONTENT_DIR + "build")
+        ),
         createSandboxBundle(defines).pipe(
           gulp.dest(CHROME_BUILD_CONTENT_DIR + "build")
         ),

src/display/api.js

@@ -2345,9 +2345,14 @@ class RendererWorker {
   #handler;
 
   constructor(channelPort, enableHWA) {
-    this.#worker = new Worker("../src/display/renderer_worker.js", {
-      type: "module",
-    });
+    const src =
+      // eslint-disable-next-line no-nested-ternary
+      typeof PDFJSDev === "undefined"
+        ? "../src/pdf.worker.js"
+        : PDFJSDev.test("MOZCENTRAL")
+          ? "resource://pdf.js/build/pdf.worker.mjs"
+          : "../build/pdf.worker.mjs";
+    this.#worker = new Worker(src, { type: "module" });
     this.#handler = new MessageHandler("main", "renderer", this.#worker);
     this.#handler.send("configure", { channelPort, enableHWA }, [channelPort]);
     this.#handler.on("ready", () => {

src/pdf.renderer.js

@@ -0,0 +1,18 @@
+/* Copyright 2025 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { RendererMessageHandler } from "./display/renderer_worker.js";
+
+export { RendererMessageHandler };