cc/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_CONTENT_LAYER_H_
   6 #define CC_CONTENT_LAYER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "cc/cc_export.h"
  10 #include "cc/layer_painter.h"
  11 #include "cc/tiled_layer.h"
  12
  13 class SkCanvas;
  14
  15 namespace cc {
  16
  17 class ContentLayerClient;
  18 class LayerUpdater;
  19
  20 class CC_EXPORT ContentLayerPainter : public LayerPainter {
  21 public:
  22     static scoped_ptr<ContentLayerPainter> create(ContentLayerClient*);
  23
  24     virtual void paint(SkCanvas*, gfx::Rect contentRect, gfx::RectF& opaque) OVERRIDE;
  25
  26 private:
  27     explicit ContentLayerPainter(ContentLayerClient*);
  28
  29     ContentLayerClient* m_client;
  30
  31     DISALLOW_COPY_AND_ASSIGN(ContentLayerPainter);
  32 };
  33
  34 // A layer that renders its contents into an SkCanvas.
  35 class CC_EXPORT ContentLayer : public TiledLayer {
  36 public:
  37     static scoped_refptr<ContentLayer> create(ContentLayerClient*);
  38
  39     void clearClient() { m_client = 0; }
  40     bool useLCDText() const { return m_useLCDText; }
  41
  42     virtual bool drawsContent() const OVERRIDE;
  43     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
  44     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
  45     virtual bool needMoreUpdates() OVERRIDE;
  46
  47     virtual void setContentsOpaque(bool) OVERRIDE;
  48
  49 protected:
  50     explicit ContentLayer(ContentLayerClient*);
  51     virtual ~ContentLayer();
  52
  53 private:
  54     virtual LayerUpdater* updater() const OVERRIDE;
  55     virtual void createUpdaterIfNeeded() OVERRIDE;
  56
  57     void updateUseLCDText();
  58     // Called when LCD text setting is about to potentially change.
  59     // If this function returns true, the setting is allowed to change.
  60     // If it returns false, the setting is not changed.
  61     bool useLCDTextWillChange() const;
  62     void useLCDTextDidChange();
  63
  64     ContentLayerClient* m_client;
  65     scoped_refptr<LayerUpdater> m_updater;
  66
  67     bool m_useLCDText;
  68     int m_lcdTextChangeCount;
  69     static const int kLCDTextMaxChangeCount;
  70 };
  71
  72 }
  73 #endif  // CC_CONTENT_LAYER_H_