Simplify ImageWorkerManager initialization

src/core/CoreTextureManager.ts

@@ -209,21 +209,16 @@ export class CoreTextureManager extends EventEmitter {
           this.hasWorker &&
           numImageWorkers > 0
         ) {
-          const imageWorkers = new ImageWorkerManager(numImageWorkers, result);
-
-          // wait for the image worker manager to be initialized
-          imageWorkers.once('initialized', () => {
-            // enable image worker manager
-            this.imageWorkerManager = imageWorkers;
-          });
+          this.imageWorkerManager = new ImageWorkerManager(
+            numImageWorkers,
+            result,
+          );
         } else {
           console.warn(
             '[Lightning] Imageworker is 0 or not supported on this browser. Image loading will be slower.',
           );
         }
 
-        // Do an early init event, we don't need to wait for the image worker manager to be initialized.
-        // Loading textures will be done on the main thread from this point on until the image worker manager is ready.
         this.emit('initialized');
       })
       .catch((e) => {

src/core/lib/ImageWorker.ts

@@ -17,7 +17,6 @@
  * limitations under the License.
  */
 
-import { EventEmitter } from '../../common/EventEmitter.js';
 import type { CreateImageBitmapSupport } from '../CoreTextureManager.js';
 import { type TextureData } from '../textures/Texture.js';
 
@@ -138,14 +137,6 @@ function createImageWorker() {
   }
 
   self.onmessage = (event) => {
-    if (event.data.type === 'init') {
-      // Store support level sent from the main thread
-      supportsOptionsCreateImageBitmap = event.data.support.config;
-      supportsFullCreateImageBitmap = event.data.support.full;
-      self.postMessage({ initialized: true });
-      return;
-    }
-
     var src = event.data.src;
     var id = event.data.id;
     var premultiplyAlpha = event.data.premultiplyAlpha;
@@ -165,7 +156,7 @@ function createImageWorker() {
 }
 /* eslint-enable */
 
-export class ImageWorkerManager extends EventEmitter {
+export class ImageWorkerManager {
   imageWorkersEnabled = true;
   messageManager: Record<number, MessageCallback> = {};
   workers: Worker[] = [];
@@ -176,7 +167,6 @@ export class ImageWorkerManager extends EventEmitter {
     numImageWorkers: number,
     createImageBitmapSupport: CreateImageBitmapSupport,
   ) {
-    super();
     this.workers = this.createWorkers(
       numImageWorkers,
       createImageBitmapSupport,
@@ -187,12 +177,6 @@ export class ImageWorkerManager extends EventEmitter {
   }
 
   private handleMessage(event: MessageEvent) {
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
-    if (event.data?.initialized) {
-      this.emit('initialized');
-      return;
-    }
-
     const { id, data, error } = event.data as ImageWorkerMessage;
     const msg = this.messageManager[id];
     if (msg) {
@@ -210,7 +194,19 @@ export class ImageWorkerManager extends EventEmitter {
     numWorkers = 1,
     createImageBitmapSupport: CreateImageBitmapSupport,
   ): Worker[] {
-    const workerCode = `(${createImageWorker.toString()})()`;
+    let workerCode = `(${createImageWorker.toString()})()`;
+
+    // Replace placeholders with actual initialization values
+    const supportsOptions = createImageBitmapSupport.options ? 'true' : 'false';
+    const supportsFull = createImageBitmapSupport.full ? 'true' : 'false';
+    workerCode = workerCode.replace(
+      'var supportsOptionsCreateImageBitmap = false;',
+      `var supportsOptionsCreateImageBitmap = ${supportsOptions};`,
+    );
+    workerCode = workerCode.replace(
+      'var supportsFullCreateImageBitmap = false;',
+      `var supportsFullCreateImageBitmap = ${supportsFull};`,
+    );
 
     const blob: Blob = new Blob([workerCode.replace('"use strict";', '')], {
       type: 'application/javascript',