2 files changed, 27 insertions, 4 deletions
diff --git a/gfx/skia_util.cc b/gfx/skia_util.cc
index 13ef4d9..865f8fda 100644
--- a/gfx/skia_util.cc
+++ b/gfx/skia_util.cc
@@ -5,6 +5,7 @@
 #include "gfx/skia_util.h"
 
 #include "gfx/rect.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
@@ -38,5 +39,23 @@ SkShader* CreateGradientShader(int start_point,
       grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode);
 }
 
-}  // namespace gfx
+bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
+  void* addr1 = NULL;
+  void* addr2 = NULL;
+  size_t size1 = 0;
+  size_t size2 = 0;
+
+  bitmap1.lockPixels();
+  addr1 = bitmap1.getAddr32(0, 0);
+  size1 = bitmap1.getSize();
+  bitmap1.unlockPixels();
+
+  bitmap2.lockPixels();
+  addr2 = bitmap2.getAddr32(0, 0);
+  size2 = bitmap2.getSize();
+  bitmap2.unlockPixels();
 
+  return (size1 == size2) && (0 == memcmp(addr1, addr2, bitmap1.getSize()));
+}
+
+}  // namespace gfx
diff --git a/gfx/skia_util.h b/gfx/skia_util.h
index 4a55c77..26c54bf 100644
--- a/gfx/skia_util.h
+++ b/gfx/skia_util.h
@@ -2,13 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef APP_GFX_SKIA_UTIL_H_
-#define APP_GFX_SKIA_UTIL_H_
+#ifndef GFX_SKIA_UTIL_H_
+#define GFX_SKIA_UTIL_H_
 #pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkRect.h"
 
+class SkBitmap;
 class SkShader;
 
 namespace gfx {
@@ -30,6 +31,9 @@ SkShader* CreateGradientShader(int start_point,
                                SkColor start_color,
                                SkColor end_color);
 
+// Returns true if the two bitmaps contain the same pixels.
+bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2);
+
 }  // namespace gfx;
 
-#endif  // APP_GFX_SKIA_UTIL_H_
+#endif  // GFX_SKIA_UTIL_H_