Call GdiAlphaBlend directly instead of the AlphaBlend wrapper in msimg32.dll....

base/gfx/bitmap_platform_device_win.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/gfx/bitmap_platform_device_win.h"
 
 #include "base/gfx/gdi_util.h"
 #include "base/logging.h"
 #include "base/process_util.h"
 #include "SkMatrix.h"
@@ skipping 358 matching lines @@
     BitBlt(dc,
            x,
            y,
            copy_width,
            copy_height,
            source_dc,
            src_rect->left,
            src_rect->top,
            SRCCOPY);
   } else {
+    DCHECK(copy_width != 0 && copy_height != 0);
     BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
-    AlphaBlend(dc,
-               x,
-               y,
-               copy_width,
-               copy_height,
-               source_dc,
-               src_rect->left,
-               src_rect->top,
-               copy_width,
-               copy_height,
-               blend_function);
+    GdiAlphaBlend(dc,
+                  x,
+                  y,
+                  copy_width,
+                  copy_height,
+                  source_dc,
+                  src_rect->left,
+                  src_rect->top,
+                  copy_width,
+                  copy_height,
+                  blend_function);
   }
   LoadTransformToDC(source_dc, data_->transform());
 
   if (created_dc)
     data_->ReleaseBitmapDC();
 }
 
 void BitmapPlatformDeviceWin::prepareForGDI(int x, int y, int width,
                                             int height) {
   processPixels<PrepareAlphaForGDI>(x, y, width, height);
@@ skipping 60 matching lines @@
       for (int j = 0; j < width; j++) {
         adjustor(data + j);
       }
       data += row_words;
     }
   }
 }
 
 }  // namespace gfx