cc/tiled_layer.h

   1 // Copyright 2011 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_TILED_LAYER_H_
   6 #define CC_TILED_LAYER_H_
   7
   8 #include "cc/cc_export.h"
   9 #include "cc/contents_scaling_layer.h"
  10 #include "cc/layer_tiling_data.h"
  11 #include "cc/layer_updater.h"
  12
  13 namespace cc {
  14 class UpdatableTile;
  15
  16 class CC_EXPORT TiledLayer : public ContentsScalingLayer {
  17 public:
  18     enum TilingOption { AlwaysTile, NeverTile, AutoTile };
  19
  20     virtual void setIsMask(bool) OVERRIDE;
  21
  22     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
  23
  24     virtual bool drawsContent() const OVERRIDE;
  25
  26     virtual void setNeedsDisplayRect(const gfx::RectF&) OVERRIDE;
  27
  28     virtual void setLayerTreeHost(LayerTreeHost*) OVERRIDE;
  29
  30     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
  31
  32     virtual Region visibleContentOpaqueRegion() const OVERRIDE;
  33
  34     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
  35
  36 protected:
  37     TiledLayer();
  38     virtual ~TiledLayer();
  39
  40     void updateTileSizeAndTilingOption();
  41     void updateBounds();
  42
  43     // Exposed to subclasses for testing.
  44     void setTileSize(const gfx::Size&);
  45     void setTextureFormat(GLenum textureFormat) { m_textureFormat = textureFormat; }
  46     void setBorderTexelOption(LayerTilingData::BorderTexelOption);
  47     size_t numPaintedTiles() { return m_tiler->tiles().size(); }
  48
  49     virtual LayerUpdater* updater() const = 0;
  50     virtual void createUpdaterIfNeeded() = 0;
  51
  52     // Set invalidations to be potentially repainted during update().
  53     void invalidateContentRect(const gfx::Rect& contentRect);
  54
  55     // Reset state on tiles that will be used for updating the layer.
  56     void resetUpdateState();
  57
  58     // After preparing an update, returns true if more painting is needed.
  59     bool needsIdlePaint();
  60     gfx::Rect idlePaintRect();
  61
  62     bool skipsDraw() const { return m_skipsDraw; }
  63
  64     // Virtual for testing
  65     virtual PrioritizedResourceManager* resourceManager() const;
  66
  67 private:
  68     virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
  69
  70     void createTilerIfNeeded();
  71     void setTilingOption(TilingOption);
  72
  73     bool tileOnlyNeedsPartialUpdate(UpdatableTile*);
  74     bool tileNeedsBufferedUpdate(UpdatableTile*);
  75
  76     void markOcclusionsAndRequestTextures(int left, int top, int right, int bottom, const OcclusionTracker*);
  77
  78     bool updateTiles(int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&, bool& didPaint);
  79     bool haveTexturesForTiles(int left, int top, int right, int bottom, bool ignoreOcclusions);
  80     gfx::Rect markTilesForUpdate(int left, int top, int right, int bottom, bool ignoreOcclusions);
  81     void updateTileTextures(const gfx::Rect& paintRect, int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&);
  82     void updateScrollPrediction();
  83
  84     UpdatableTile* tileAt(int, int) const;
  85     UpdatableTile* createTile(int, int);
  86
  87     GLenum m_textureFormat;
  88     bool m_skipsDraw;
  89     bool m_failedUpdate;
  90
  91     // Used for predictive painting.
  92     gfx::Vector2d m_predictedScroll;
  93     gfx::Rect m_predictedVisibleRect;
  94     gfx::Rect m_previousVisibleRect;
  95     gfx::Size m_previousContentBounds;
  96
  97     TilingOption m_tilingOption;
  98     scoped_ptr<LayerTilingData> m_tiler;
  99 };
 100
 101 }
 102 #endif  // CC_TILED_LAYER_H_