fix(textures): adjust premultiplyAlpha handling for Safari 8 (movistar) compatibility

src/core/lib/ImageWorker.ts

@@ -268,7 +268,7 @@ export class ImageWorkerManager {
       );
     }
 
-    if (createImageBitmapSupport.premultiplyHonored === false) {
+    if (createImageBitmapSupport.premultiplyHonored !== true) {
       workerCode = workerCode.replace(
         'var premultiplyAlphaHonored = true;',
         'var premultiplyAlphaHonored = false;',

src/core/textures/ImageTexture.ts

@@ -191,18 +191,9 @@ export class ImageTexture extends Texture {
   }> {
     const hasAlphaChannel = premultiplyAlpha ?? blob.type.includes('image/png');
     const imageBitmapSupported = this.txManager.imageBitmapSupported;
-
-    // When the device does NOT honor the createImageBitmap premultiply option
-    // (e.g. older Safari), request a straight ('none') bitmap and let WebGL
-    // premultiply on upload instead. `premultiplyAlpha` in the returned
-    // TextureData means "WebGL should premultiply this source on upload".
-    const useGlPremultiply =
-      hasAlphaChannel === true &&
-      imageBitmapSupported.premultiplyHonored === false;
-    const bitmapMode: 'premultiply' | 'none' =
-      hasAlphaChannel === true && useGlPremultiply === false
-        ? 'premultiply'
-        : 'none';
+    const bitmapPremultiply: 'premultiply' | 'none' = hasAlphaChannel
+      ? 'premultiply'
+      : 'none';
 
     if (imageBitmapSupported.full === true && sw !== null && sh !== null) {
       // createImageBitmap with crop
@@ -213,29 +204,27 @@ export class ImageTexture extends Texture {
         sw,
         sh,
         {
-          premultiplyAlpha: bitmapMode,
+          premultiplyAlpha: bitmapPremultiply,
           colorSpaceConversion: 'none',
           imageOrientation: 'none',
         },
       );
-      return { data: bitmap, premultiplyAlpha: useGlPremultiply };
+      return { data: bitmap, premultiplyAlpha: hasAlphaChannel };
     } else if (imageBitmapSupported.basic === true) {
-      // basic createImageBitmap without options or crop
-      // this is supported for Chrome v50 to v52/54 that doesn't support options.
-      // The browser default premultiplies, so WebGL must not premultiply again.
+      // basic createImageBitmap without options or crop (Chrome v50–54)
       return {
         data: await this.platform.createImageBitmap(blob),
-        premultiplyAlpha: false,
+        premultiplyAlpha: hasAlphaChannel,
       };
     }
 
-    // default createImageBitmap without crop but with options
+    // default: createImageBitmap without crop but with options
     const bitmap = await this.platform.createImageBitmap(blob, {
-      premultiplyAlpha: bitmapMode,
+      premultiplyAlpha: bitmapPremultiply,
       colorSpaceConversion: 'none',
       imageOrientation: 'none',
     });
-    return { data: bitmap, premultiplyAlpha: useGlPremultiply };
+    return { data: bitmap, premultiplyAlpha: hasAlphaChannel };
   }
 
   async loadImage(src: string) {
@@ -305,14 +294,9 @@ export class ImageTexture extends Texture {
       };
     }
 
-    // The loader computes whether WebGL should premultiply this source on
-    // upload (it depends on the source type and on whether createImageBitmap
-    // honored the premultiply option). Preserve it; fall back to the prop only
-    // when the loader didn't decide.
     return {
       data: resp.data,
-      premultiplyAlpha:
-        resp.premultiplyAlpha ?? this.props.premultiplyAlpha ?? true,
+      premultiplyAlpha: this.props.premultiplyAlpha ?? true,
     };
   }