[rtextures] ImageDraw(): Don't try to blend images without alpha (#4395)

Author: Not-Nik

src/rtextures.c

@@ -3969,13 +3969,21 @@ void ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dstRec, Color
         //    [-] GetPixelColor(): Get Vector4 instead of Color, easier for ColorAlphaBlend()
         //    [ ] Support f32bit channels drawing
 
-        // TODO: Support PIXELFORMAT_UNCOMPRESSED_R32, PIXELFORMAT_UNCOMPRESSED_R32G32B32, PIXELFORMAT_UNCOMPRESSED_R32G32B32A32 and 16-bit equivalents
+        // TODO: Support PIXELFORMAT_UNCOMPRESSED_R32G32B32A32 and PIXELFORMAT_UNCOMPRESSED_R1616B16A16
 
         Color colSrc, colDst, blend;
         bool blendRequired = true;
 
         // Fast path: Avoid blend if source has no alpha to blend
-        if ((tint.a == 255) && ((srcPtr->format == PIXELFORMAT_UNCOMPRESSED_GRAYSCALE) || (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R8G8B8) || (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R5G6B5))) blendRequired = false;
+        if ((tint.a == 255) &&
+            ((srcPtr->format == PIXELFORMAT_UNCOMPRESSED_GRAYSCALE) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R5G6B5) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R8G8B8) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R32) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R32G32B32) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R16) ||
+            (srcPtr->format == PIXELFORMAT_UNCOMPRESSED_R16G16B16)))
+            blendRequired = false;
 
         int strideDst = GetPixelDataSize(dst->width, 1, dst->format);
         int bytesPerPixelDst = strideDst/(dst->width);