cc/resources/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_RESOURCES_TILING_SET_RASTER_QUEUE_REQUIRED_H_
   6 #define CC_RESOURCES_TILING_SET_RASTER_QUEUE_REQUIRED_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/resources/picture_layer_tiling_set.h"
  10 #include "cc/resources/raster_tile_priority_queue.h"
  11 #include "cc/resources/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   Tile* Top();
  25   const Tile* Top() const;
  26   void Pop();
  27   bool IsEmpty() const;
  28
  29  private:
  30   // This iterator will return all tiles that are in the NOW bin on the given
  31   // tiling. The queue can then use these tiles and further filter them based on
  32   // whether they are required or not.
  33   class TilingIterator {
  34    public:
  35     TilingIterator();
  36     explicit TilingIterator(PictureLayerTiling* tiling,
  37                             TilingData* tiling_data);
  38     ~TilingIterator();
  39
  40     bool done() const { return current_tile_ == nullptr; }
  41     const Tile* operator*() const { return current_tile_; }
  42     Tile* operator*() { return current_tile_; }
  43     TilingIterator& operator++();
  44
  45    private:
  46     PictureLayerTiling* tiling_;
  47     TilingData* tiling_data_;
  48
  49     Tile* current_tile_;
  50     TilingData::Iterator visible_iterator_;
  51   };
  52
  53   bool IsTileRequired(const Tile* tile) const;
  54
  55   TilingIterator iterator_;
  56   RasterTilePriorityQueue::Type type_;
  57 };
  58
  59 }  // namespace cc
  60
  61 #endif  // CC_RESOURCES_TILING_SET_RASTER_QUEUE_REQUIRED_H_