content/renderer/browser_plugin/browser_plugin_backing_store.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__
   6 #define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__
   7
   8 #include <vector>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "third_party/skia/include/core/SkBitmap.h"
  12 #include "ui/gfx/size.h"
  13 #include "ui/gfx/vector2d.h"
  14
  15 class SkCanvas;
  16 class TransportDIB;
  17
  18 namespace gfx {
  19 class Canvas;
  20 class Point;
  21 class Rect;
  22 }
  23
  24 namespace content {
  25
  26 // The BrowserPluginBackingStore is a wrapper around an SkBitmap that is used
  27 // in the software rendering path of the browser plugin. The backing store has
  28 // two write operations:
  29 // 1. PaintToBackingStore copies pixel regions to the bitmap.
  30 // 2. ScrollBackingStore scrolls a region of the bitmap by dx, and dy.
  31 // These are called in response to changes in the guest relayed via
  32 // BrowserPluginMsg_UpdateRect. See BrowserPlugin::UpdateRect.
  33 class BrowserPluginBackingStore {
  34  public:
  35   BrowserPluginBackingStore(const gfx::Size& size, float scale_factor);
  36   virtual ~BrowserPluginBackingStore();
  37
  38   void PaintToBackingStore(
  39       const gfx::Rect& bitmap_rect,
  40       const std::vector<gfx::Rect>& copy_rects,
  41       TransportDIB* dib);
  42
  43   void ScrollBackingStore(const gfx::Vector2d& delta,
  44                           const gfx::Rect& clip_rect,
  45                           const gfx::Size& view_size);
  46
  47   void Clear(SkColor clear_color);
  48
  49   const gfx::Size& GetSize() const { return size_; }
  50
  51   const SkBitmap& GetBitmap() const { return bitmap_; }
  52
  53   float GetScaleFactor() const { return scale_factor_; }
  54
  55  private:
  56   gfx::Size size_;
  57   SkBitmap bitmap_;
  58   scoped_ptr<SkCanvas> canvas_;
  59   float scale_factor_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(BrowserPluginBackingStore);
  62 };
  63
  64 }  // namespace content
  65
  66 #endif  // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BACKING_STORE_H__