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      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 namespace debug {
     22 class TracedValue;
     23 }
     24 class Value;
     25 }
     26 
     27 namespace cc {
     28 
     29 class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
     30  public:
     31   PicturePileBase();
     32   explicit PicturePileBase(const PicturePileBase* other);
     33 
     34   gfx::Size tiling_size() const { return tiling_.tiling_size(); }
     35   void SetMinContentsScale(float min_contents_scale);
     36 
     37   // If non-empty, all pictures tiles inside this rect are recorded. There may
     38   // be recordings outside this rect, but everything inside the rect is
     39   // recorded.
     40   gfx::Rect recorded_viewport() const { return recorded_viewport_; }
     41 
     42   int num_tiles_x() const { return tiling_.num_tiles_x(); }
     43   int num_tiles_y() const { return tiling_.num_tiles_y(); }
     44   gfx::Rect tile_bounds(int x, int y) const { return tiling_.TileBounds(x, y); }
     45   bool HasRecordingAt(int x, int y);
     46   bool CanRaster(float contents_scale, const gfx::Rect& content_rect);
     47 
     48   // If this pile contains any valid recordings. May have false positives.
     49   bool HasRecordings() const { return has_any_recordings_; }
     50 
     51   // If this pile has ever contained any recordings with text.
     52   bool has_text() const { return has_text_; }
     53 
     54   bool is_solid_color() const { return is_solid_color_; }
     55   SkColor solid_color() const { return solid_color_; }
     56 
     57   void set_is_mask(bool is_mask) { is_mask_ = is_mask; }
     58   bool is_mask() const { return is_mask_; }
     59 
     60   static void ComputeTileGridInfo(const gfx::Size& tile_grid_size,
     61                                   SkTileGridFactory::TileGridInfo* info);
     62 
     63   void SetTileGridSize(const gfx::Size& tile_grid_size);
     64   TilingData& tiling() { return tiling_; }
     65 
     66   void AsValueInto(base::debug::TracedValue* array) const;
     67 
     68  protected:
     69   class CC_EXPORT PictureInfo {
     70    public:
     71     enum {
     72       INVALIDATION_FRAMES_TRACKED = 32
     73     };
     74 
     75     PictureInfo();
     76     ~PictureInfo();
     77 
     78     bool Invalidate(int frame_number);
     79     bool NeedsRecording(int frame_number, int distance_to_visible);
     80     void SetPicture(scoped_refptr<Picture> picture);
     81     const Picture* GetPicture() const;
     82 
     83     float GetInvalidationFrequencyForTesting() const {
     84       return GetInvalidationFrequency();
     85     }
     86 
     87    private:
     88     void AdvanceInvalidationHistory(int frame_number);
     89     float GetInvalidationFrequency() const;
     90 
     91     int last_frame_number_;
     92     scoped_refptr<const Picture> picture_;
     93     std::bitset<INVALIDATION_FRAMES_TRACKED> invalidation_history_;
     94   };
     95 
     96   typedef std::pair<int, int> PictureMapKey;
     97   typedef base::hash_map<PictureMapKey, PictureInfo> PictureMap;
     98 
     99   virtual ~PicturePileBase();
    100 
    101   int buffer_pixels() const { return tiling_.border_texels(); }
    102   void Clear();
    103 
    104   gfx::Rect PaddedRect(const PictureMapKey& key) const;
    105   gfx::Rect PadRect(const gfx::Rect& rect) const;
    106 
    107   // An internal CanRaster check that goes to the picture_map rather than
    108   // using the recorded_viewport hint.
    109   bool CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const;
    110 
    111   // A picture pile is a tiled set of pictures. The picture map is a map of tile
    112   // indices to picture infos.
    113   PictureMap picture_map_;
    114   TilingData tiling_;
    115   gfx::Rect recorded_viewport_;
    116   float min_contents_scale_;
    117   SkTileGridFactory::TileGridInfo tile_grid_info_;
    118   SkColor background_color_;
    119   int slow_down_raster_scale_factor_for_debug_;
    120   bool contents_opaque_;
    121   bool contents_fill_bounds_completely_;
    122   bool show_debug_picture_borders_;
    123   bool clear_canvas_with_debug_color_;
    124   // A hint about whether there are any recordings. This may be a false
    125   // positive.
    126   bool has_any_recordings_;
    127   bool has_text_;
    128   bool is_mask_;
    129   bool is_solid_color_;
    130   SkColor solid_color_;
    131 
    132  private:
    133   void SetBufferPixels(int buffer_pixels);
    134 
    135   friend class base::RefCounted<PicturePileBase>;
    136   DISALLOW_COPY_AND_ASSIGN(PicturePileBase);
    137 };
    138 
    139 }  // namespace cc
    140 
    141 #endif  // CC_RESOURCES_PICTURE_PILE_BASE_H_
    142