Implement unique IDs and card linking

src/gfx/blend_image.cpp

@@ -55,9 +55,9 @@ void linear_blend(Image& img1, const Image& img2, double x1,double y1, double x2
       data1 += 3;
       data2 += 3;
     }
-  }
-
-  // Blend Alpha for the two images.
+  }
+
+  // Blend Alpha for the two images.
   if (img1.HasAlpha() && img2.HasAlpha()) {
     Byte *alpha1 = img1.GetAlpha(), *alpha2 = img2.GetAlpha();
     for (int y = 0; y < height; ++y) {