update detect method of texture type

resources/assets/src/scripts/textureUtils.ts

@@ -1,14 +1,18 @@
 import { loadSkinToCanvas } from 'skinview-utils'
 
 /* istanbul ignore next */
-function isTransparent(
+function checkPixel(
   context: CanvasRenderingContext2D,
   x: number,
   y: number,
 ): boolean {
   const imageData = context.getImageData(x, y, 1, 1)
 
-  return imageData.data[3] !== 255
+  return (
+    imageData.data[0] === 0 &&
+    imageData.data[1] === 0 &&
+    imageData.data[2] === 0
+  )
 }
 
 /* istanbul ignore next */
@@ -32,7 +36,16 @@ export function isAlex(texture: string): Promise<boolean> {
         return
       }
 
-      resolve(isTransparent(context, 46 * ratio, 63 * ratio))
+      for (let x = 46 * ratio; x < 48 * ratio; x += 1) {
+        for (let y = 52 * ratio; y < 64 * ratio; y += 1) {
+          if (!checkPixel(context, x, y)) {
+            resolve(false)
+            return
+          }
+        }
+      }
+
+      resolve(true)
     }
   })
 }