feat: get image bitmap

Author: Tsuk1ko

Diff for: src/classes/sprite.ts

@@ -67,6 +67,10 @@ export class Sprite extends AssetBase {
     }
     return this.spriteRenderData.getImage();
   }
+
+  getImageBitmap(): ArrayBuffer | undefined {
+    return this.getImageJimp()?.bitmap.data.buffer;
+  }
 }
 
 export class SpriteRenderData {

Diff for: src/classes/texture2d.ts

@@ -78,6 +78,10 @@ export class Texture2D extends AssetBase {
     return this.getImageJimpRaw().flip(false, true);
   }
 
+  getImageBitmap() {
+    return this.image.data.buffer.slice(0);
+  }
+
   getTransformedImageJimp(
     { downscaleMultiplier = 1, textureRect, settingsRaw }: TextureTransformedOptions,
     alphaTexture?: Texture2D,