Add platform_canvas_unittest.cc

base/gfx/skia_utils_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 "base/gfx/skia_utils_mac.h"
 
 #include "base/logging.h"
+#include "SkMatrix.h"
 #include "SkRect.h"
 
 namespace gfx {
 
+CGAffineTransform SkMatrixToCGAffineTransform(const SkMatrix& matrix) {
+  // CGAffineTransforms don't support perspective transforms, so make sure
+  // we don't get those.
+  DCHECK(matrix[SkMatrix::kMPersp0] == 0.0f);
+  DCHECK(matrix[SkMatrix::kMPersp1] == 0.0f);
+  DCHECK(matrix[SkMatrix::kMPersp2] == 1.0f);
+  
+  return CGAffineTransformMake(matrix[SkMatrix::kMScaleX],
+                               matrix[SkMatrix::kMSkewY],
+                               matrix[SkMatrix::kMSkewX],
+                               matrix[SkMatrix::kMScaleY],
+                               matrix[SkMatrix::kMTransX],
+                               matrix[SkMatrix::kMTransY]);
+}
+  
 SkIRect CGRectToSkIRect(const CGRect& rect) {
   SkIRect sk_rect = {
     SkScalarRound(rect.origin.x),
     SkScalarRound(rect.origin.y),
     SkScalarRound(rect.origin.x + rect.size.width),
     SkScalarRound(rect.origin.y + rect.size.height)
   };
   return sk_rect;
 }
 
@@ skipping 36 matching lines @@
 // Converts ARGB to CGColorRef.
 CGColorRef SkColorToCGColorRef(SkColor color) {
   return CGColorCreateGenericRGB(SkColorGetR(color) / 255.0,
                                  SkColorGetG(color) / 255.0,
                                  SkColorGetB(color) / 255.0,
                                  SkColorGetA(color) / 255.0);
 }
 
 }  // namespace gfx