blob: e1545217836cb4f45892de954b21253a004f108e [file] [log] [blame]
// 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.
#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 "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<SkPixelRef*> 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 {
explicit PixelRefMap(const gfx::Size& cell_size);
void GatherPixelRefsFromPicture(SkPicture* picture);
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 {
// Default iterator constructor that is used as place holder for invalid
// Iterator.
Iterator(const gfx::Rect& layer_rect, const Picture* picture);
Iterator(const gfx::Rect& layer_rect, const DisplayItemList* picture);
SkPixelRef* operator->() const {
DCHECK_LT(current_index_, current_pixel_refs_->size());
return (*current_pixel_refs_)[current_index_];
SkPixelRef* 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();
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_;
gfx::Point min_pixel_cell_;
gfx::Point max_pixel_cell_;
gfx::Size cell_size_;
PixelRefHashmap data_hash_map_;
} // namespace cc