BackingStoreSkia: Use skia for painting in RenderWidgetHostViewViews.

chrome/browser/renderer_host/backing_store_skia.h

+// Copyright (c) 2011 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 CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_SKIA_H_
+#define CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_SKIA_H_
+#pragma once
+
+#include "base/scoped_ptr.h"
+#include "chrome/browser/renderer_host/backing_store.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+class SkCanvas;
+
+namespace gfx {
+class Point;
+class Canvas;
+}
+
+// A backing store that uses skia.
+class BackingStoreSkia : public BackingStore {
+ public:
+  BackingStoreSkia(RenderWidgetHost* widget, const gfx::Size& size);
+  virtual ~BackingStoreSkia();
+
+  void SkiaShowRect(const gfx::Point& point, gfx::Canvas* canvas);
+
+  // BackingStore implementation.
+  virtual size_t MemorySize();
+  virtual void PaintToBackingStore(
+      RenderProcessHost* process,
+      TransportDIB::Id bitmap,
+      const gfx::Rect& bitmap_rect,
+      const std::vector<gfx::Rect>& copy_rects);
+  virtual bool CopyFromBackingStore(const gfx::Rect& rect,
+                                    skia::PlatformCanvas* output);
+  virtual void ScrollBackingStore(int dx, int dy,
+                                  const gfx::Rect& clip_rect,
+                                  const gfx::Size& view_size);
+
+ private:
+  SkBitmap bitmap_;
+
+  scoped_ptr<SkCanvas> canvas_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackingStoreSkia);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_SKIA_H_