cc/resources/picture_pile_impl.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_IMPL_H_
   6 #define CC_RESOURCES_PICTURE_PILE_IMPL_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <vector>
  11
  12 #include "base/time/time.h"
  13 #include "cc/base/cc_export.h"
  14 #include "cc/debug/rendering_stats_instrumentation.h"
  15 #include "cc/resources/picture_pile.h"
  16 #include "cc/resources/pixel_ref_map.h"
  17 #include "cc/resources/raster_source.h"
  18 #include "skia/ext/analysis_canvas.h"
  19 #include "skia/ext/refptr.h"
  20
  21 class SkCanvas;
  22 class SkPicture;
  23 class SkPixelRef;
  24
  25 namespace gfx {
  26 class Rect;
  27 }
  28
  29 namespace cc {
  30
  31 class CC_EXPORT PicturePileImpl : public RasterSource {
  32  public:
  33   static scoped_refptr<PicturePileImpl> CreateFromPicturePile(
  34       const PicturePile* other,
  35       bool can_use_lcd_text);
  36
  37   // RasterSource overrides. See RasterSource header for full description.
  38   // When slow-down-raster-scale-factor is set to a value greater than 1, the
  39   // reported rasterize time (in stats_instrumentation) is the minimum measured
  40   // value over all runs.
  41   void PlaybackToCanvas(SkCanvas* canvas,
  42                         const gfx::Rect& canvas_rect,
  43                         float contents_scale) const override;
  44   void PlaybackToSharedCanvas(SkCanvas* canvas,
  45                               const gfx::Rect& canvas_rect,
  46                               float contents_scale) const override;
  47   void PerformSolidColorAnalysis(
  48       const gfx::Rect& content_rect,
  49       float contents_scale,
  50       RasterSource::SolidColorAnalysis* analysis) const override;
  51   void GatherPixelRefs(const gfx::Rect& content_rect,
  52                        float contents_scale,
  53                        std::vector<SkPixelRef*>* pixel_refs) const override;
  54   bool CoversRect(const gfx::Rect& content_rect,
  55                   float contents_scale) const override;
  56   void SetShouldAttemptToUseDistanceFieldText() override;
  57   bool ShouldAttemptToUseDistanceFieldText() const override;
  58   gfx::Size GetSize() const override;
  59   bool IsSolidColor() const override;
  60   SkColor GetSolidColor() const override;
  61   bool HasRecordings() const override;
  62   bool CanUseLCDText() const override;
  63   scoped_refptr<RasterSource> CreateCloneWithoutLCDText() const override;
  64
  65   // Tracing functionality.
  66   void DidBeginTracing() override;
  67   void AsValueInto(base::trace_event::TracedValue* array) const override;
  68   skia::RefPtr<SkPicture> GetFlattenedPicture() override;
  69   size_t GetPictureMemoryUsage() const override;
  70
  71   // Iterator used to return SkPixelRefs from this picture pile.
  72   // Public for testing.
  73   class CC_EXPORT PixelRefIterator {
  74    public:
  75     PixelRefIterator(const gfx::Rect& content_rect,
  76                      float contents_scale,
  77                      const PicturePileImpl* picture_pile);
  78     ~PixelRefIterator();
  79
  80     SkPixelRef* operator->() const { return *pixel_ref_iterator_; }
  81     SkPixelRef* operator*() const { return *pixel_ref_iterator_; }
  82     PixelRefIterator& operator++();
  83     operator bool() const { return pixel_ref_iterator_; }
  84
  85    private:
  86     void AdvanceToTilePictureWithPixelRefs();
  87
  88     const PicturePileImpl* picture_pile_;
  89     gfx::Rect layer_rect_;
  90     TilingData::Iterator tile_iterator_;
  91     PixelRefMap::Iterator pixel_ref_iterator_;
  92     std::set<const void*> processed_pictures_;
  93   };
  94
  95  protected:
  96   friend class PicturePile;
  97   friend class PixelRefIterator;
  98
  99   using PictureMapKey = PicturePile::PictureMapKey;
 100   using PictureMap = PicturePile::PictureMap;
 101
 102   PicturePileImpl();
 103   explicit PicturePileImpl(const PicturePile* other, bool can_use_lcd_text);
 104   explicit PicturePileImpl(const PicturePileImpl* other, bool can_use_lcd_text);
 105   ~PicturePileImpl() override;
 106
 107   int buffer_pixels() const { return tiling_.border_texels(); }
 108
 109   // These members are const as this raster source may be in use on another
 110   // thread and so should not be touched after construction.
 111   const PictureMap picture_map_;
 112   const TilingData tiling_;
 113   const SkColor background_color_;
 114   const bool requires_clear_;
 115   const bool can_use_lcd_text_;
 116   const bool is_solid_color_;
 117   const SkColor solid_color_;
 118   const gfx::Rect recorded_viewport_;
 119   const bool has_any_recordings_;
 120   const bool clear_canvas_with_debug_color_;
 121   const float min_contents_scale_;
 122   const int slow_down_raster_scale_factor_for_debug_;
 123   // TODO(enne/vmiura): this has a read/write race between raster and compositor
 124   // threads with multi-threaded Ganesh.  Make this const or remove it.
 125   bool should_attempt_to_use_distance_field_text_;
 126
 127  private:
 128   typedef std::map<const Picture*, Region> PictureRegionMap;
 129
 130   // Called when analyzing a tile. We can use AnalysisCanvas as
 131   // SkDrawPictureCallback, which allows us to early out from analysis.
 132   void RasterForAnalysis(skia::AnalysisCanvas* canvas,
 133                          const gfx::Rect& canvas_rect,
 134                          float contents_scale) const;
 135
 136   void CoalesceRasters(const gfx::Rect& canvas_rect,
 137                        const gfx::Rect& content_rect,
 138                        float contents_scale,
 139                        PictureRegionMap* result) const;
 140
 141   void RasterCommon(SkCanvas* canvas,
 142                     SkDrawPictureCallback* callback,
 143                     const gfx::Rect& canvas_rect,
 144                     float contents_scale) const;
 145
 146   // An internal CanRaster check that goes to the picture_map rather than
 147   // using the recorded_viewport hint.
 148   bool CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const;
 149
 150   gfx::Rect PaddedRect(const PictureMapKey& key) const;
 151
 152   DISALLOW_COPY_AND_ASSIGN(PicturePileImpl);
 153 };
 154
 155 }  // namespace cc
 156
 157 #endif  // CC_RESOURCES_PICTURE_PILE_IMPL_H_