Get our color channels straight. The reason why the color swap was required...

skia/ext/skia_utils_mac.mm

 // 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/skia_utils_mac.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/scoped_cftyperef.h"
@@ skipping 109 matching lines @@
     return bitmap;  // Return |bitmap| which should respond true to isNull().
 
   bitmap.setIsOpaque(is_opaque);
 
   scoped_cftyperef<CGColorSpaceRef> color_space(
     CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));
   void* data = bitmap.getPixels();
 
   // Allocate a bitmap context with 4 components per pixel (BGRA). Apple
   // recommends these flags for improved CG performance.
+#define HAS_ARGB_SHIFTS(a, r, g, b) \
+            (SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \
+             && SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b))
+#if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0)
   scoped_cftyperef<CGContextRef> context(
     CGBitmapContextCreate(data, size.width, size.height, 8, size.width*4,
                           color_space,
                           kCGImageAlphaPremultipliedFirst |
                               kCGBitmapByteOrder32Host));
+#else
+#error We require that Skia's and CoreGraphics's recommended \
+       image memory layout match.
+#endif
+#undef HAS_ARGB_SHIFTS
 
   // Something went really wrong. Best guess is that the bitmap data is invalid.
   DCHECK(context != NULL);
 
   // Save the current graphics context so that we can restore it later.
   NSGraphicsContext* current_context = [NSGraphicsContext currentContext];
 
   // Dummy context that we will draw into.
   NSGraphicsContext* context_cocoa =
     [NSGraphicsContext graphicsContextWithGraphicsPort:context flipped:NO];
   [NSGraphicsContext setCurrentContext:context_cocoa];
 
   // This will stretch any images to |size| if it does not fit or is non-square.
   [image drawInRect:NSMakeRect(0, 0, size.width, size.height)
            fromRect:NSZeroRect
           operation:NSCompositeCopy
            fraction:1.0];
 
   // Done drawing, restore context.
   [NSGraphicsContext setCurrentContext:current_context];
 
   return bitmap;
 }
 
 }  // namespace gfx