cc: Do solid color analysis before scheduling tiles.

cc/playback/display_list_raster_source.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
 #define CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/playback/display_list_recording_source.h"
 #include "skia/ext/analysis_canvas.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace cc {
 class DisplayItemList;
 class DrawImage;
 
 class CC_EXPORT DisplayListRasterSource
     : public base::RefCountedThreadSafe<DisplayListRasterSource> {
  public:
   struct CC_EXPORT SolidColorAnalysis {

[vmpstr, 2015/12/29 21:24:23]

This can go away too right?

[sohanjg, 2015/12/30 12:45:47]

Done.

     SolidColorAnalysis()
         : is_solid_color(false), solid_color(SK_ColorTRANSPARENT) {}
     ~SolidColorAnalysis() {}
 
     bool is_solid_color;
     SkColor solid_color;
   };
 
   static scoped_refptr<DisplayListRasterSource>
   CreateFromDisplayListRecordingSource(const DisplayListRecordingSource* other,
@@ skipping 13 matching lines @@
 
   // Similar to above, except that the canvas passed here can (or was already)
   // rasterized into by another raster source. That is, it is not safe to clear
   // the canvas or discard its underlying memory.
   void PlaybackToSharedCanvas(SkCanvas* canvas,
                               const gfx::Rect& canvas_rect,
                               float contents_scale) const;
 
   // Analyze to determine if the given rect at given scale is of solid color in
   // this raster source.
-  void PerformSolidColorAnalysis(const gfx::Rect& content_rect,
+  bool PerformSolidColorAnalysis(const gfx::Rect& content_rect,
                                  float contents_scale,
-                                 SolidColorAnalysis* analysis) const;
+                                 SkColor* color) const;
 
   // Returns true iff the whole raster source is of solid color.
   bool IsSolidColor() const;
 
   // Returns the color of the raster source if it is solid color. The results
   // are unspecified if IsSolidColor returns false.
   SkColor GetSolidColor() const;
 
   // Returns the size of this raster source.
   gfx::Size GetSize() const;
@@ skipping 77 matching lines @@
                                   const gfx::Rect& canvas_bitmap_rect,
                                   const gfx::Rect& canvas_playback_rect,
                                   float contents_scale) const;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayListRasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_