Browser Plugin: New Implementation (Renderer Side)

content/renderer/browser_plugin/browser_plugin_backing_store.h

+// Copyright (c) 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 CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__
+#define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/size.h"
+
+class SkCanvas;
+class TransportDIB;
+
+namespace gfx {
+class Canvas;
+class Point;
+class Rect;
+}
+
+namespace content {
+
+// The BrowserPluginBackingStore is a wrapper around an SkBitmap that is used
+// in the software rendering path of the browser plugin. The backing store has
+// two write operations:
+// 1. PaintToBackingStore copies pixel regions to the bitmap.
+// 2. ScrollBackingStore scrolls a region of the bitmap by dx, and dy.
+// These are called in response to changes in the guest relayed via
+// BrowserPluginMsg_UpdateRect. See BrowserPlugin::UpdateRect.
+class BrowserPluginBackingStore {
+ public:
+  BrowserPluginBackingStore(const gfx::Size& size, float scale_factor);
+  virtual ~BrowserPluginBackingStore();
+
+  void PaintToBackingStore(
+      const gfx::Rect& bitmap_rect,
+      const std::vector<gfx::Rect>& copy_rects,
+      TransportDIB* dib);
+
+  void ScrollBackingStore(int dx,
+                          int dy,
+                          const gfx::Rect& clip_rect,
+                          const gfx::Size& view_size);
+
+  const gfx::Size& GetSize() const { return size_; }
+
+  const SkBitmap& GetBitmap() const { return bitmap_; }
+
+  float GetScaleFactor() const { return scale_factor_; }
+
+ private:
+  gfx::Size size_;
+  SkBitmap bitmap_;
+  scoped_ptr<SkCanvas> canvas_;
+  float scale_factor_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserPluginBackingStore);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__