1 files changed, 39 insertions, 0 deletions
diff --git a/cc/caching_bitmap_content_layer_updater.h b/cc/caching_bitmap_content_layer_updater.h
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--- /dev/null
+++ b/cc/caching_bitmap_content_layer_updater.h
@@ -0,0 +1,39 @@
+// Copyright 2012 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.
+
+#ifndef CACHING_BITMAP_CANVAS_LAYER_UPDATER_H_
+#define CACHING_BITMAP_CANVAS_LAYER_UPDATER_H_
+
+#include "base/compiler_specific.h"
+#include "cc/bitmap_content_layer_updater.h"
+
+namespace cc {
+
+class CachingBitmapContentLayerUpdater
+    : public BitmapContentLayerUpdater {
+ public:
+  static scoped_refptr<CachingBitmapContentLayerUpdater> Create(
+      scoped_ptr<LayerPainter>);
+
+  virtual void prepareToUpdate(const IntRect& content_rect,
+                               const IntSize& tile_size,
+                               float contents_width_scale,
+                               float contents_height_scale,
+                               IntRect& resulting_opaque_rect,
+                               RenderingStats&) OVERRIDE;
+
+  bool pixelsDidChange() const;
+
+ private:
+  explicit CachingBitmapContentLayerUpdater(
+      scoped_ptr<LayerPainter> painter);
+  virtual ~CachingBitmapContentLayerUpdater();
+
+  bool pixels_did_change_;
+  SkBitmap cached_bitmap_;
+};
+
+}  // namespace cc
+
+#endif  // CACHING_BITMAP_CANVAS_LAYER_UPDATER_H_