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// 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_PICTURE_LAYER_TILING_H_
#define CC_PICTURE_LAYER_TILING_H_
#include "base/basictypes.h"
#include "base/hash_tables.h"
#include "base/memory/scoped_ptr.h"
#include "cc/cc_export.h"
#include "cc/hash_pair.h"
#include "cc/region.h"
#include "cc/tile.h"
#include "cc/tiling_data.h"
#include "ui/gfx/rect.h"
namespace cc {
class PictureLayerTiling;
class PictureLayerTilingClient {
public:
virtual scoped_refptr<Tile> CreateTile(PictureLayerTiling*, gfx::Rect) = 0;
};
class CC_EXPORT PictureLayerTiling {
public:
~PictureLayerTiling();
static scoped_ptr<PictureLayerTiling> Create(float contents_scale,
gfx::Size tile_size);
scoped_ptr<PictureLayerTiling> Clone() const;
const PictureLayerTiling& operator=(const PictureLayerTiling&);
void SetLayerBounds(gfx::Size layer_bounds);
void Invalidate(const Region& layer_invalidation);
void SetClient(PictureLayerTilingClient* client);
gfx::Rect ContentRect() const;
float contents_scale() const { return contents_scale_; }
// Iterate over all tiles to fill content_rect. Even if tiles are invalid
// (i.e. no valid resource) this tiling should still iterate over them.
// The union of all geometry_rect calls for each element iterated over should
// exactly equal content_rect and no two geometry_rects should intersect.
class CC_EXPORT Iterator {
public:
Iterator();
Iterator(PictureLayerTiling* tiling, float dest_scale, gfx::Rect rect);
~Iterator();
// Visible rect (no borders), always in the space of content_rect,
// regardless of the contents scale of the tiling.
gfx::Rect geometry_rect() const;
// Texture rect (in texels) for geometry_rect
gfx::RectF texture_rect() const;
gfx::Size texture_size() const;
Tile* operator->() const { return current_tile_; }
Tile* operator*() const { return current_tile_; }
Iterator& operator++();
operator bool() const { return current_tile_; }
private:
PictureLayerTiling* tiling_;
gfx::Rect dest_rect_;
float dest_to_content_scale_;
Tile* current_tile_;
gfx::Rect current_geometry_rect_;
int tile_i_;
int tile_j_;
int left_;
int top_;
int right_;
int bottom_;
friend class PictureLayerTiling;
};
Region OpaqueRegionInContentRect(const gfx::Rect&) const;
void Reset() { return tiles_.clear(); }
protected:
typedef std::pair<int, int> TileMapKey;
typedef base::hash_map<TileMapKey, scoped_refptr<Tile> > TileMap;
PictureLayerTiling(float contents_scale, gfx::Size tileSize);
Tile* TileAt(int, int) const;
void CreateTile(int i, int j);
PictureLayerTilingClient* client_;
float contents_scale_;
gfx::Size layer_bounds_;
TileMap tiles_;
TilingData tiling_data_;
friend class Iterator;
};
} // namespace cc
#endif // CC_PICTURE_LAYER_TILING_H_
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