cc/layers/content_layer_client.h

   1 // Copyright 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 CC_LAYERS_CONTENT_LAYER_CLIENT_H_
   6 #define CC_LAYERS_CONTENT_LAYER_CLIENT_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/playback/display_item_list.h"
  10
  11 class SkCanvas;
  12
  13 namespace gfx {
  14 class Rect;
  15 }
  16
  17 namespace cc {
  18
  19 class CC_EXPORT ContentLayerClient {
  20  public:
  21   enum PaintingControlSetting {
  22     PAINTING_BEHAVIOR_NORMAL,
  23     DISPLAY_LIST_CONSTRUCTION_DISABLED,
  24     DISPLAY_LIST_CACHING_DISABLED,
  25     DISPLAY_LIST_PAINTING_DISABLED
  26   };
  27
  28   virtual void PaintContents(SkCanvas* canvas,
  29                              const gfx::Rect& clip,
  30                              PaintingControlSetting painting_status) = 0;
  31
  32   virtual scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
  33       const gfx::Rect& clip,
  34       PaintingControlSetting painting_status) = 0;
  35
  36   // If true the layer may skip clearing the background before rasterizing,
  37   // because it will cover any uncleared data with content.
  38   virtual bool FillsBoundsCompletely() const = 0;
  39
  40   // Returns an estimate of the current memory usage within this object,
  41   // excluding memory shared with painting artifacts (i.e.,
  42   // DisplayItemList). Should be invoked after PaintContentsToDisplayList,
  43   // so that the result includes data cached internally during painting.
  44   virtual size_t GetApproximateUnsharedMemoryUsage() const = 0;
  45
  46  protected:
  47   virtual ~ContentLayerClient() {}
  48 };
  49
  50 }  // namespace cc
  51
  52 #endif  // CC_LAYERS_CONTENT_LAYER_CLIENT_H_