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

base/gfx/vector_device.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/vector_device.h"
 
 #include "base/gfx/gdi_util.h"
 #include "base/gfx/skia_utils.h"
 #include "base/logging.h"
 #include "base/scoped_handle.h"
@@ skipping 565 matching lines @@
     // sure IE7 was doing so kind of bitmasking due to the way translucent image
     // where renderered but after some windbg tracing, it is being done by the
     // printer driver after all (mostly HP printers). IE7 always use AlphaBlend
     // for bitmasked images. The trick seems to switch the stretching mode in
     // what the driver expects.
     DWORD previous_mode = GetStretchBltMode(dc);
     BOOL result = SetStretchBltMode(dc, COLORONCOLOR);
     DCHECK(result);
     // Note that this function expect premultiplied colors (!)
     BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, alpha, AC_SRC_ALPHA};
-    result = AlphaBlend(dc,
-                        x, y,  // Destination origin.
-                        src_size_x, src_size_y,  // Destination size.
-                        bitmap_dc,
-                        0, 0,  // Source origin.
-                        src_size_x, src_size_y,  // Source size.
-                        blend_function);
+    result = GdiAlphaBlend(dc,
+                           x, y,  // Destination origin.
+                           src_size_x, src_size_y,  // Destination size.
+                           bitmap_dc,
+                           0, 0,  // Source origin.
+                           src_size_x, src_size_y,  // Source size.
+                           blend_function);
     DCHECK(result);
     result = SetStretchBltMode(dc, previous_mode);
     DCHECK(result);
   } else {
     BOOL result = StretchDIBits(dc,
                                 x, y,  // Destination origin.
                                 src_size_x, src_size_y,
                                 0, 0,  // Source origin.
                                 src_size_x, src_size_y,  // Source size.
                                 pixels,
                                 reinterpret_cast<const BITMAPINFO*>(&hdr),
                                 DIB_RGB_COLORS,
                                 SRCCOPY);
     DCHECK(result);
   }
   Cleanup();
 }
 
 }  // namespace gfx