cc: Add tiling raster tile iterators.

cc/resources/tile.h

 // Copyright 2012 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_RESOURCES_TILE_H_
 #define CC_RESOURCES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 61 matching lines @@
     if (use_gpu_rasterization)
       flags_ |= USE_GPU_RASTERIZATION;
     else
       flags_ &= ~USE_GPU_RASTERIZATION;
   }
 
   bool use_gpu_rasterization() const {
     return !!(flags_ & USE_GPU_RASTERIZATION);
   }
 
+  bool NeedsRasterForMode(RasterMode mode) const {
+    return !managed_state_.tile_versions[mode].IsReadyToDraw();
+  }
+
+  bool HasResources() const {
+    for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
+      if (managed_state_.tile_versions[mode].has_resource())
+        return true;
+    }
+    return false;
+  }
+
   scoped_ptr<base::Value> AsValue() const;
 
   inline bool IsReadyToDraw() const {
     for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
       if (managed_state_.tile_versions[mode].IsReadyToDraw())
         return true;
     }
     return false;
   }
 
@@ skipping 17 matching lines @@
 
   int source_frame_number() const { return source_frame_number_; }
 
   void set_picture_pile(scoped_refptr<PicturePileImpl> pile) {
     DCHECK(pile->CanRaster(contents_scale_, content_rect_));
     picture_pile_ = pile;
   }
 
   size_t GPUMemoryUsageInBytes() const;
 
+  gfx::Size size() const { return tile_size_.size(); }
+
+  RasterMode DetermineRasterModeForTree(WhichTree tree) const;
+  RasterMode DetermineOverallRasterMode() const;
+
+  // Functionality used in tests.
   RasterMode GetRasterModeForTesting() const {
     return managed_state().raster_mode;
   }
   ManagedTileState::TileVersion& GetTileVersionForTesting(RasterMode mode) {
     return managed_state_.tile_versions[mode];
   }
 
-  gfx::Size size() const { return tile_size_.size(); }
-
  private:
   friend class TileManager;
   friend class PrioritizedTileSet;
   friend class FakeTileManager;
   friend class BinComparator;
   friend class FakePictureLayerImpl;
 
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,
        PicturePileImpl* picture_pile,
        const gfx::Size& tile_size,
        const gfx::Rect& content_rect,
        const gfx::Rect& opaque_rect,
        float contents_scale,
        int layer_id,
        int source_frame_number,
        int flags);
   ~Tile();
 
   ManagedTileState& managed_state() { return managed_state_; }
   const ManagedTileState& managed_state() const { return managed_state_; }
+  RasterMode DetermineRasterModeForResolution(TileResolution resolution) const;
 
   TileManager* tile_manager_;
   scoped_refptr<PicturePileImpl> picture_pile_;
   gfx::Rect tile_size_;
   gfx::Rect content_rect_;
   float contents_scale_;
   gfx::Rect opaque_rect_;
 
   TilePriority priority_[NUM_TREES];
   ManagedTileState managed_state_;
   int layer_id_;
   int source_frame_number_;
   int flags_;
 
   Id id_;
   static Id s_next_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_