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      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_H_
      6 #define CC_RESOURCES_PICTURE_H_
      7 
      8 #include <string>
      9 #include <utility>
     10 #include <vector>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/containers/hash_tables.h"
     14 #include "base/debug/trace_event.h"
     15 #include "base/lazy_instance.h"
     16 #include "base/logging.h"
     17 #include "base/memory/ref_counted.h"
     18 #include "base/memory/scoped_ptr.h"
     19 #include "cc/base/cc_export.h"
     20 #include "skia/ext/lazy_pixel_ref.h"
     21 #include "skia/ext/refptr.h"
     22 #include "third_party/skia/include/core/SkPixelRef.h"
     23 #include "third_party/skia/include/core/SkTileGridPicture.h"
     24 #include "ui/gfx/rect.h"
     25 
     26 namespace base {
     27 class Value;
     28 }
     29 
     30 namespace skia {
     31 class AnalysisCanvas;
     32 }
     33 
     34 namespace cc {
     35 
     36 class ContentLayerClient;
     37 class RenderingStatsInstrumentation;
     38 
     39 class CC_EXPORT Picture
     40     : public base::RefCountedThreadSafe<Picture> {
     41  public:
     42   typedef std::pair<int, int> PixelRefMapKey;
     43   typedef std::vector<skia::LazyPixelRef*> PixelRefs;
     44   typedef base::hash_map<PixelRefMapKey, PixelRefs> PixelRefMap;
     45 
     46   static scoped_refptr<Picture> Create(gfx::Rect layer_rect);
     47   static scoped_refptr<Picture> CreateFromValue(const base::Value* value);
     48 
     49   gfx::Rect LayerRect() const { return layer_rect_; }
     50   gfx::Rect OpaqueRect() const { return opaque_rect_; }
     51 
     52   // Get thread-safe clone for rasterizing with on a specific thread.
     53   scoped_refptr<Picture> GetCloneForDrawingOnThread(
     54       unsigned thread_index) const;
     55 
     56   // Make thread-safe clones for rasterizing with.
     57   void CloneForDrawing(int num_threads);
     58 
     59   // Record a paint operation. To be able to safely use this SkPicture for
     60   // playback on a different thread this can only be called once.
     61   void Record(ContentLayerClient* client,
     62               const SkTileGridPicture::TileGridInfo& tile_grid_info,
     63               RenderingStatsInstrumentation* stats_instrumentation);
     64 
     65   // Gather pixel refs from recording.
     66   void GatherPixelRefs(const SkTileGridPicture::TileGridInfo& tile_grid_info,
     67                        RenderingStatsInstrumentation* stats_instrumentation);
     68 
     69   // Has Record() been called yet?
     70   bool HasRecording() const { return picture_.get() != NULL; }
     71 
     72   // Apply this contents scale and raster the content rect into the canvas.
     73   void Raster(SkCanvas* canvas,
     74               SkDrawPictureCallback* callback,
     75               gfx::Rect content_rect,
     76               float contents_scale);
     77 
     78   // Draw the picture directly into the given canvas, without applying any
     79   // clip/scale/layer transformations.
     80   void Replay(SkCanvas* canvas);
     81 
     82   scoped_ptr<base::Value> AsValue() const;
     83 
     84   class CC_EXPORT PixelRefIterator {
     85    public:
     86     PixelRefIterator();
     87     PixelRefIterator(gfx::Rect layer_rect, const Picture* picture);
     88     ~PixelRefIterator();
     89 
     90     skia::LazyPixelRef* operator->() const {
     91       DCHECK_LT(current_index_, current_pixel_refs_->size());
     92       return (*current_pixel_refs_)[current_index_];
     93     }
     94 
     95     skia::LazyPixelRef* operator*() const {
     96       DCHECK_LT(current_index_, current_pixel_refs_->size());
     97       return (*current_pixel_refs_)[current_index_];
     98     }
     99 
    100     PixelRefIterator& operator++();
    101     operator bool() const {
    102       return current_index_ < current_pixel_refs_->size();
    103     }
    104 
    105    private:
    106     static base::LazyInstance<PixelRefs> empty_pixel_refs_;
    107     const Picture* picture_;
    108     const PixelRefs* current_pixel_refs_;
    109     unsigned current_index_;
    110 
    111     gfx::Point min_point_;
    112     gfx::Point max_point_;
    113     int current_x_;
    114     int current_y_;
    115   };
    116 
    117   void EmitTraceSnapshot();
    118 
    119  private:
    120   explicit Picture(gfx::Rect layer_rect);
    121   // This constructor assumes SkPicture is already ref'd and transfers
    122   // ownership to this picture.
    123   Picture(const skia::RefPtr<SkPicture>&,
    124           gfx::Rect layer_rect,
    125           gfx::Rect opaque_rect,
    126           const PixelRefMap& pixel_refs);
    127   // This constructor will call AdoptRef on the SkPicture.
    128   Picture(SkPicture*,
    129           gfx::Rect layer_rect,
    130           gfx::Rect opaque_rect);
    131   ~Picture();
    132 
    133   gfx::Rect layer_rect_;
    134   gfx::Rect opaque_rect_;
    135   skia::RefPtr<SkPicture> picture_;
    136 
    137   typedef std::vector<scoped_refptr<Picture> > PictureVector;
    138   PictureVector clones_;
    139 
    140   PixelRefMap pixel_refs_;
    141   gfx::Point min_pixel_cell_;
    142   gfx::Point max_pixel_cell_;
    143   gfx::Size cell_size_;
    144 
    145   scoped_ptr<base::debug::ConvertableToTraceFormat>
    146     AsTraceableRasterData(gfx::Rect rect, float scale) const;
    147   scoped_ptr<base::debug::ConvertableToTraceFormat>
    148     AsTraceableRecordData() const;
    149 
    150   friend class base::RefCountedThreadSafe<Picture>;
    151   friend class PixelRefIterator;
    152   DISALLOW_COPY_AND_ASSIGN(Picture);
    153 };
    154 
    155 }  // namespace cc
    156 
    157 #endif  // CC_RESOURCES_PICTURE_H_
    158