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// Copyright 2015 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_PIXEL_REF_MAP_H_
#define CC_PLAYBACK_PIXEL_REF_MAP_H_
#include <utility>
#include <vector>
#include "base/containers/hash_tables.h"
#include "base/lazy_instance.h"
#include "base/memory/ref_counted.h"
#include "cc/base/cc_export.h"
#include "skia/ext/pixel_ref_utils.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
class SkPixelRef;
namespace cc {
class Picture;
class DisplayItemList;
typedef std::pair<int, int> PixelRefMapKey;
typedef std::vector<skia::PositionPixelRef> PixelRefs;
typedef base::hash_map<PixelRefMapKey, PixelRefs> PixelRefHashmap;
// This class is used and owned by cc Picture class. It is used to gather pixel
// refs which would happen after record. It takes in |cell_size| to decide how
// big each grid cell should be.
class CC_EXPORT PixelRefMap {
public:
explicit PixelRefMap(const gfx::Size& cell_size);
~PixelRefMap();
void GatherPixelRefsFromPicture(SkPicture* picture,
const gfx::Rect& layer_rect);
bool empty() const { return data_hash_map_.empty(); }
// This iterator imprecisely returns the set of pixel refs that are needed to
// raster this layer rect from this picture. Internally, pixel refs are
// clumped into tile grid buckets, so there may be false positives.
class CC_EXPORT Iterator {
public:
// Default iterator constructor that is used as place holder for invalid
// Iterator.
Iterator();
Iterator(const gfx::Rect& layer_rect, const Picture* picture);
Iterator(const gfx::Rect& layer_rect, const DisplayItemList* picture);
~Iterator();
const skia::PositionPixelRef* operator->() const {
DCHECK_LT(current_index_, current_pixel_refs_->size());
return &(*current_pixel_refs_)[current_index_];
}
const skia::PositionPixelRef& operator*() const {
DCHECK_LT(current_index_, current_pixel_refs_->size());
return (*current_pixel_refs_)[current_index_];
}
Iterator& operator++();
operator bool() const {
return current_index_ < current_pixel_refs_->size();
}
private:
void PointToFirstPixelRef(const gfx::Rect& query_rect);
static base::LazyInstance<PixelRefs> empty_pixel_refs_;
const PixelRefMap* target_pixel_ref_map_;
const PixelRefs* current_pixel_refs_;
unsigned current_index_;
gfx::Rect map_layer_rect_;
gfx::Point min_point_;
gfx::Point max_point_;
int current_x_;
int current_y_;
};
private:
gfx::Point min_pixel_cell_;
gfx::Point max_pixel_cell_;
gfx::Size cell_size_;
PixelRefHashmap data_hash_map_;
};
} // namespace cc
#endif // CC_PLAYBACK_PIXEL_REF_MAP_H_