cc/resources/picture_pile.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_RESOURCES_PICTURE_PILE_H_
   6 #define CC_RESOURCES_PICTURE_PILE_H_
   7
   8 #include <bitset>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/containers/hash_tables.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "cc/base/tiling_data.h"
  15 #include "cc/resources/picture.h"
  16
  17 namespace cc {
  18 class PicturePileImpl;
  19
  20 class CC_EXPORT PicturePile : public RecordingSource {
  21  public:
  22   PicturePile(float min_contents_scale, const gfx::Size& tile_grid_size);
  23   ~PicturePile() override;
  24
  25   // RecordingSource overrides.
  26   bool UpdateAndExpandInvalidation(ContentLayerClient* painter,
  27                                    Region* invalidation,
  28                                    const gfx::Size& layer_size,
  29                                    const gfx::Rect& visible_layer_rect,
  30                                    int frame_number,
  31                                    RecordingMode recording_mode) override;
  32   scoped_refptr<RasterSource> CreateRasterSource(
  33       bool can_use_lcd_text) const override;
  34   gfx::Size GetSize() const final;
  35   void SetEmptyBounds() override;
  36   void SetSlowdownRasterScaleFactor(int factor) override;
  37   void SetBackgroundColor(SkColor background_color) override;
  38   void SetRequiresClear(bool requires_clear) override;
  39   bool IsSuitableForGpuRasterization() const override;
  40   void SetUnsuitableForGpuRasterizationForTesting() override;
  41   gfx::Size GetTileGridSizeForTesting() const override;
  42
  43  protected:
  44   class CC_EXPORT PictureInfo {
  45    public:
  46     enum { INVALIDATION_FRAMES_TRACKED = 32 };
  47
  48     PictureInfo();
  49     ~PictureInfo();
  50
  51     bool Invalidate(int frame_number);
  52     bool NeedsRecording(int frame_number, int distance_to_visible);
  53     void SetPicture(scoped_refptr<Picture> picture);
  54     const Picture* GetPicture() const;
  55
  56     float GetInvalidationFrequencyForTesting() const {
  57       return GetInvalidationFrequency();
  58     }
  59
  60    private:
  61     void AdvanceInvalidationHistory(int frame_number);
  62     float GetInvalidationFrequency() const;
  63
  64     int last_frame_number_;
  65     scoped_refptr<const Picture> picture_;
  66     std::bitset<INVALIDATION_FRAMES_TRACKED> invalidation_history_;
  67   };
  68
  69   typedef std::pair<int, int> PictureMapKey;
  70   typedef base::hash_map<PictureMapKey, PictureInfo> PictureMap;
  71
  72   // An internal CanRaster check that goes to the picture_map rather than
  73   // using the recorded_viewport hint.
  74   bool CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const;
  75
  76   void Clear();
  77
  78   void SetMinContentsScale(float min_contents_scale);
  79   void SetTileGridSize(const gfx::Size& tile_grid_size);
  80
  81   gfx::Rect PaddedRect(const PictureMapKey& key) const;
  82   gfx::Rect PadRect(const gfx::Rect& rect) const;
  83
  84   int buffer_pixels() const { return tiling_.border_texels(); }
  85
  86   // A picture pile is a tiled set of pictures. The picture map is a map of tile
  87   // indices to picture infos.
  88   PictureMap picture_map_;
  89   TilingData tiling_;
  90
  91   // If non-empty, all pictures tiles inside this rect are recorded. There may
  92   // be recordings outside this rect, but everything inside the rect is
  93   // recorded.
  94   gfx::Rect recorded_viewport_;
  95   float min_contents_scale_;
  96   gfx::Size tile_grid_size_;
  97   int slow_down_raster_scale_factor_for_debug_;
  98   // A hint about whether there are any recordings. This may be a false
  99   // positive.
 100   bool has_any_recordings_;
 101   bool clear_canvas_with_debug_color_;
 102   bool requires_clear_;
 103   bool is_solid_color_;
 104   SkColor solid_color_;
 105   SkColor background_color_;
 106   int pixel_record_distance_;
 107
 108  private:
 109   friend class PicturePileImpl;
 110
 111   void CreatePictures(ContentLayerClient* painter,
 112                       RecordingMode recording_mode,
 113                       const std::vector<gfx::Rect>& record_rects);
 114   void GetInvalidTileRects(const gfx::Rect& interest_rect,
 115                            Region* invalidation,
 116                            const gfx::Rect& visible_layer_rect,
 117                            int frame_number,
 118                            std::vector<gfx::Rect>* invalid_tiles);
 119   bool ApplyInvalidationAndResize(const gfx::Rect& interest_rect,
 120                                   Region* invalidation,
 121                                   const gfx::Size& layer_size,
 122                                   int frame_number);
 123   void DetermineIfSolidColor();
 124   void SetBufferPixels(int buffer_pixels);
 125
 126   bool is_suitable_for_gpu_rasterization_;
 127
 128   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 129 };
 130
 131 }  // namespace cc
 132
 133 #endif  // CC_RESOURCES_PICTURE_PILE_H_