cc/resources/picture_pile_base.h

   1 // Copyright 2013 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_BASE_H_
   6 #define CC_RESOURCES_PICTURE_PILE_BASE_H_
   7
   8 #include <bitset>
   9 #include <list>
  10 #include <utility>
  11
  12 #include "base/containers/hash_tables.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "cc/base/cc_export.h"
  15 #include "cc/base/region.h"
  16 #include "cc/base/tiling_data.h"
  17 #include "cc/resources/picture.h"
  18 #include "ui/gfx/size.h"
  19
  20 namespace base {
  21 class Value;
  22 }
  23
  24 namespace cc {
  25
  26 class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
  27  public:
  28   PicturePileBase();
  29   explicit PicturePileBase(const PicturePileBase* other);
  30   PicturePileBase(const PicturePileBase* other, unsigned thread_index);
  31
  32   void SetTilingRect(const gfx::Rect& tiling_rect);
  33   gfx::Rect tiling_rect() const { return tiling_.tiling_rect(); }
  34   void SetMinContentsScale(float min_contents_scale);
  35
  36   // If non-empty, all pictures tiles inside this rect are recorded. There may
  37   // be recordings outside this rect, but everything inside the rect is
  38   // recorded.
  39   gfx::Rect recorded_viewport() const { return recorded_viewport_; }
  40
  41   int num_tiles_x() const { return tiling_.num_tiles_x(); }
  42   int num_tiles_y() const { return tiling_.num_tiles_y(); }
  43   gfx::Rect tile_bounds(int x, int y) const { return tiling_.TileBounds(x, y); }
  44   bool HasRecordingAt(int x, int y);
  45   bool CanRaster(float contents_scale, const gfx::Rect& content_rect);
  46
  47   // If this pile contains any valid recordings. May have false positives.
  48   bool HasRecordings() const { return has_any_recordings_; }
  49
  50   static void ComputeTileGridInfo(const gfx::Size& tile_grid_size,
  51                                   SkTileGridFactory::TileGridInfo* info);
  52
  53   void SetTileGridSize(const gfx::Size& tile_grid_size);
  54   TilingData& tiling() { return tiling_; }
  55
  56   scoped_ptr<base::Value> AsValue() const;
  57
  58  protected:
  59   class CC_EXPORT PictureInfo {
  60    public:
  61     enum {
  62       INVALIDATION_FRAMES_TRACKED = 32
  63     };
  64
  65     PictureInfo();
  66     ~PictureInfo();
  67
  68     bool Invalidate(int frame_number);
  69     bool NeedsRecording(int frame_number, int distance_to_visible);
  70     PictureInfo CloneForThread(int thread_index) const;
  71     void SetPicture(scoped_refptr<Picture> picture);
  72     Picture* GetPicture() const;
  73
  74     float GetInvalidationFrequencyForTesting() const {
  75       return GetInvalidationFrequency();
  76     }
  77
  78    private:
  79     void AdvanceInvalidationHistory(int frame_number);
  80     float GetInvalidationFrequency() const;
  81
  82     int last_frame_number_;
  83     scoped_refptr<Picture> picture_;
  84     std::bitset<INVALIDATION_FRAMES_TRACKED> invalidation_history_;
  85   };
  86
  87   typedef std::pair<int, int> PictureMapKey;
  88   typedef base::hash_map<PictureMapKey, PictureInfo> PictureMap;
  89
  90   virtual ~PicturePileBase();
  91
  92   int buffer_pixels() const { return tiling_.border_texels(); }
  93   void Clear();
  94
  95   gfx::Rect PaddedRect(const PictureMapKey& key);
  96   gfx::Rect PadRect(const gfx::Rect& rect);
  97
  98   // An internal CanRaster check that goes to the picture_map rather than
  99   // using the recorded_viewport hint.
 100   bool CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const;
 101
 102   // A picture pile is a tiled set of pictures. The picture map is a map of tile
 103   // indices to picture infos.
 104   PictureMap picture_map_;
 105   TilingData tiling_;
 106   gfx::Rect recorded_viewport_;
 107   float min_contents_scale_;
 108   SkTileGridFactory::TileGridInfo tile_grid_info_;
 109   SkColor background_color_;
 110   int slow_down_raster_scale_factor_for_debug_;
 111   bool contents_opaque_;
 112   bool contents_fill_bounds_completely_;
 113   bool show_debug_picture_borders_;
 114   bool clear_canvas_with_debug_color_;
 115   // A hint about whether there are any recordings. This may be a false
 116   // positive.
 117   bool has_any_recordings_;
 118
 119  private:
 120   void SetBufferPixels(int buffer_pixels);
 121
 122   friend class base::RefCounted<PicturePileBase>;
 123   DISALLOW_COPY_AND_ASSIGN(PicturePileBase);
 124 };
 125
 126 }  // namespace cc
 127
 128 #endif  // CC_RESOURCES_PICTURE_PILE_BASE_H_