cc/layers/content_layer.h

   1 // Copyright 2010 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_H_
   6 #define CC_LAYERS_CONTENT_LAYER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "cc/base/cc_export.h"
  10 #include "cc/layers/tiled_layer.h"
  11 #include "cc/resources/layer_painter.h"
  12
  13 class SkCanvas;
  14
  15 namespace cc {
  16
  17 class ContentLayerClient;
  18 class ContentLayerUpdater;
  19
  20 class CC_EXPORT ContentLayerPainter : public LayerPainter {
  21  public:
  22   static scoped_ptr<ContentLayerPainter> Create(ContentLayerClient* client);
  23
  24   virtual void Paint(SkCanvas* canvas,
  25                      const gfx::Rect& content_rect,
  26                      gfx::RectF* opaque) OVERRIDE;
  27
  28  private:
  29   explicit ContentLayerPainter(ContentLayerClient* client);
  30
  31   ContentLayerClient* client_;
  32
  33   DISALLOW_COPY_AND_ASSIGN(ContentLayerPainter);
  34 };
  35
  36 // A layer that renders its contents into an SkCanvas.
  37 class CC_EXPORT ContentLayer : public TiledLayer {
  38  public:
  39   static scoped_refptr<ContentLayer> Create(ContentLayerClient* client);
  40
  41   void ClearClient() { client_ = NULL; }
  42
  43   virtual bool DrawsContent() const OVERRIDE;
  44   virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
  45   virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
  46       OVERRIDE;
  47   virtual bool Update(ResourceUpdateQueue* queue,
  48                       const OcclusionTracker<Layer>* occlusion) OVERRIDE;
  49   virtual bool NeedMoreUpdates() OVERRIDE;
  50
  51   virtual void SetContentsOpaque(bool contents_opaque) OVERRIDE;
  52
  53   virtual bool SupportsLCDText() const OVERRIDE;
  54
  55   virtual skia::RefPtr<SkPicture> GetPicture() const OVERRIDE;
  56
  57   virtual void OnOutputSurfaceCreated() OVERRIDE;
  58
  59  protected:
  60   explicit ContentLayer(ContentLayerClient* client);
  61   virtual ~ContentLayer();
  62
  63   // TiledLayer implementation.
  64   virtual LayerUpdater* Updater() const OVERRIDE;
  65
  66  private:
  67   // TiledLayer implementation.
  68   virtual void CreateUpdaterIfNeeded() OVERRIDE;
  69
  70   void UpdateCanUseLCDText();
  71
  72   ContentLayerClient* client_;
  73   scoped_refptr<ContentLayerUpdater> updater_;
  74   bool can_use_lcd_text_last_frame_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(ContentLayer);
  77 };
  78
  79 }  // namespace cc
  80 #endif  // CC_LAYERS_CONTENT_LAYER_H_