Vulkan: Correct CheckAlpha on scaled textures.

GPU/Vulkan/TextureCacheVulkan.cpp

@@ -1399,9 +1399,7 @@ void TextureCacheVulkan::LoadTextureLevel(TexCacheEntry &entry, uint8_t *writePt
 	CachedTextureVulkan *tex = entry.vkTex;
 	int w = gstate.getTextureWidth(level);
 	int h = gstate.getTextureHeight(level);
-	u32 *pixelData;
-	int decPitch;
-	int rowBytes;
+
 	{
 		PROFILE_THIS_SCOPE("decodetex");
 
@@ -1411,8 +1409,8 @@ void TextureCacheVulkan::LoadTextureLevel(TexCacheEntry &entry, uint8_t *writePt
 		int bufw = GetTextureBufw(level, texaddr, tfmt);
 		int bpp = dstFmt == VULKAN_8888_FORMAT ? 4 : 2;
 
-		pixelData = (u32 *)writePtr;
-		decPitch = rowPitch;
+		u32 *pixelData = (u32 *)writePtr;
+		int decPitch = rowPitch;
 		if (scaleFactor > 1) {
 			tmpTexBufRearrange.resize(std::max(bufw, w) * h);
 			pixelData = tmpTexBufRearrange.data();
@@ -1425,7 +1423,6 @@ void TextureCacheVulkan::LoadTextureLevel(TexCacheEntry &entry, uint8_t *writePt
 			memset(writePtr, 0, rowPitch * h);
 			return;
 		}
-		rowBytes = w * bpp;
 		gpuStats.numTexturesDecoded++;
 
 		if (scaleFactor > 1) {
@@ -1438,14 +1435,14 @@ void TextureCacheVulkan::LoadTextureLevel(TexCacheEntry &entry, uint8_t *writePt
 			assert(dstFmt == VULKAN_8888_FORMAT);
 			bpp = sizeof(u32);
 			decPitch = w * bpp;
-			rowBytes = w * bpp;
 
 			if (decPitch != rowPitch) {
 				// Rearrange in place to match the requested pitch.
 				// (it can only be larger than w * bpp, and a match is likely.)
 				for (int y = h - 1; y >= 0; --y) {
-					memcpy(writePtr + rowPitch * y, writePtr + decPitch * y, rowBytes);
+					memcpy(writePtr + rowPitch * y, writePtr + decPitch * y, w * bpp);
 				}
+				decPitch = rowPitch;
 			}
 		}