Make Mac bitmaps use BGRA to match the MD5 hash Apple uses in its WebKit expe...

skia/ext/bitmap_platform_device_mac.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 "skia/ext/bitmap_platform_device_mac.h"
 
 #include <time.h>
 
 #include "SkMatrix.h"
 #include "SkRegion.h"
@@ skipping 151 matching lines @@
   if (is_opaque) {
 #ifndef NDEBUG
     // To aid in finding bugs, we set the background color to something
     // obviously wrong so it will be noticable when it is not cleared
     bitmap.eraseARGB(255, 0, 255, 128);  // bright bluish green
 #endif
   }
 
   CGColorSpaceRef color_space =
     CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
-  // allocate a bitmap context with 4 components per pixel (RGBA):
+  // allocate a bitmap context with 4 components per pixel (BGRA). Apple
+  // recommends these flags for improved CG performance.
   CGContextRef bitmap_context =
     CGBitmapContextCreate(data, width, height, 8, width*4,
-                          color_space, kCGImageAlphaPremultipliedLast);
+                          color_space,
+                          kCGImageAlphaPremultipliedFirst |
+                              kCGBitmapByteOrder32Host);
 
   // Change the coordinate system to match WebCore's
   CGContextTranslateCTM(bitmap_context, 0, height);
   CGContextScaleCTM(bitmap_context, 1.0, -1.0);
   CGColorSpaceRelease(color_space);
 
   // The device object will take ownership of the graphics context.
   return new BitmapPlatformDeviceMac(
       new BitmapPlatformDeviceMacData(bitmap_context), bitmap);
 }
@@ skipping 95 matching lines @@
       size_t offset = (i + bitmap_start_y) * row_words + bitmap_start_x;
       for (int j = 0; j < width; j++) {
         adjustor(data + offset + j);
       }
     }
   }
 }
 
 }  // namespace skia