cc/tiles/tiling_set_raster_queue_required.h

   1 // Copyright 2014 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_TILES_TILING_SET_RASTER_QUEUE_REQUIRED_H_
   6 #define CC_TILES_TILING_SET_RASTER_QUEUE_REQUIRED_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/tiles/picture_layer_tiling_set.h"
  10 #include "cc/tiles/raster_tile_priority_queue.h"
  11 #include "cc/tiles/tile.h"
  12
  13 namespace cc {
  14
  15 // This queue only returns tiles that are required for either activation or
  16 // draw, as specified by RasterTilePriorityQueue::Type passed in the
  17 // constructor.
  18 class CC_EXPORT TilingSetRasterQueueRequired {
  19  public:
  20   TilingSetRasterQueueRequired(PictureLayerTilingSet* tiling_set,
  21                                RasterTilePriorityQueue::Type type);
  22   ~TilingSetRasterQueueRequired();
  23
  24   const PrioritizedTile& Top() const;
  25   void Pop();
  26   bool IsEmpty() const;
  27
  28  private:
  29   // This iterator will return all tiles that are in the NOW bin on the given
  30   // tiling. The queue can then use these tiles and further filter them based on
  31   // whether they are required or not.
  32   class TilingIterator {
  33    public:
  34     TilingIterator();
  35     explicit TilingIterator(PictureLayerTiling* tiling,
  36                             TilingData* tiling_data,
  37                             const gfx::Rect& rect);
  38     ~TilingIterator();
  39
  40     bool done() const { return !current_tile_.tile(); }
  41     const PrioritizedTile& operator*() const { return current_tile_; }
  42     TilingIterator& operator++();
  43
  44    private:
  45     PictureLayerTiling* tiling_;
  46     TilingData* tiling_data_;
  47
  48     PrioritizedTile current_tile_;
  49     TilingData::Iterator visible_iterator_;
  50   };
  51
  52   bool IsTileRequired(const PrioritizedTile& prioritized_tile) const;
  53
  54   TilingIterator iterator_;
  55   RasterTilePriorityQueue::Type type_;
  56 };
  57
  58 }  // namespace cc
  59
  60 #endif  // CC_TILES_TILING_SET_RASTER_QUEUE_REQUIRED_H_