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// Copyright 2014 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 <stddef.h>
#include <memory>
#include <utility>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/trace_event/trace_event.h"
#include "cc/base/cc_export.h"
#include "cc/base/contiguous_container.h"
#include "cc/playback/discardable_image_map.h"
#include "cc/playback/display_item.h"
#include "cc/playback/display_item_list_settings.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/geometry/rect.h"
class SkCanvas;
class SkPictureRecorder;
namespace cc {
class ClientPictureCache;
class DisplayItem;
class DrawingDisplayItem;
namespace proto {
class DisplayItemList;
class CC_EXPORT DisplayItemList
: public base::RefCountedThreadSafe<DisplayItemList> {
// Creates a display item list. If picture caching is used, then layer_rect
// specifies the cull rect of the display item list (the picture will not
// exceed this rect). If picture caching is not used, then the given rect can
// be empty.
// TODO(vmpstr): Maybe this cull rect can be part of the settings instead.
static scoped_refptr<DisplayItemList> Create(
const gfx::Rect& layer_rect,
const DisplayItemListSettings& settings);
// Creates a DisplayItemList from a Protobuf.
// TODO(dtrainor): Pass in a list of possible DisplayItems to reuse
// (
static scoped_refptr<DisplayItemList> CreateFromProto(
const proto::DisplayItemList& proto,
ClientPictureCache* client_picture_cache,
std::vector<uint32_t>* used_engine_picture_ids);
// Creates a Protobuf representing the state of this DisplayItemList.
void ToProtobuf(proto::DisplayItemList* proto);
// TODO(trchen): Deprecated. Apply clip and scale on the canvas instead.
void Raster(SkCanvas* canvas,
SkPicture::AbortCallback* callback,
const gfx::Rect& canvas_target_playback_rect,
float contents_scale) const;
void Raster(SkCanvas* canvas, SkPicture::AbortCallback* callback) const;
// This is a fast path for use only if canvas_ is set and
// retain_individual_display_items_ is false. This method also updates
// approximate_op_count_.
void RasterIntoCanvas(const DisplayItem& display_item);
// Because processing happens in this function, all the set up for
// this item should be done via the args, which is why the return
// type needs to be const, to prevent set-after-processing mistakes.
template <typename DisplayItemType, typename... Args>
const DisplayItemType& CreateAndAppendItem(const gfx::Rect& visual_rect,
Args&&... args) {
auto* item = &items_.AllocateAndConstruct<DisplayItemType>(
approximate_op_count_ += item->ApproximateOpCount();
return *item;
// Called after all items are appended, to process the items and, if
// applicable, create an internally cached SkPicture.
void Finalize();
void SetIsSuitableForGpuRasterization(bool is_suitable) {
is_suitable_for_gpu_rasterization_ = is_suitable;
bool IsSuitableForGpuRasterization() const;
int ApproximateOpCount() const;
size_t ApproximateMemoryUsage() const;
bool ShouldBeAnalyzedForSolidColor() const;
bool RetainsIndividualDisplayItems() const;
std::unique_ptr<base::trace_event::ConvertableToTraceFormat> AsValue(
bool include_items) const;
void EmitTraceSnapshot() const;
void GenerateDiscardableImagesMetadata();
void GetDiscardableImagesInRect(const gfx::Rect& rect,
float raster_scale,
std::vector<DrawImage>* images);
gfx::Rect VisualRectForTesting(int index) { return visual_rects_[index]; }
ContiguousContainer<DisplayItem>::const_iterator begin() const {
return items_.begin();
ContiguousContainer<DisplayItem>::const_iterator end() const {
return items_.end();
DisplayItemList(gfx::Rect layer_rect,
const DisplayItemListSettings& display_list_settings,
bool retain_individual_display_items);
void ProcessAppendedItem(const DisplayItem* item);
ContiguousContainer<DisplayItem> items_;
// The visual rects associated with each of the display items in the
// display item list. There is one rect per display item, and the
// position in |visual_rects_| matches the position of the item in
// |items_| . These rects are intentionally kept separate
// because they are not needed while walking the |items_| for raster.
std::vector<gfx::Rect> visual_rects_;
sk_sp<SkPicture> picture_;
std::unique_ptr<SkPictureRecorder> recorder_;
const DisplayItemListSettings settings_;
bool retain_individual_display_items_;
gfx::Rect layer_rect_;
bool is_suitable_for_gpu_rasterization_;
int approximate_op_count_;
// Memory usage due to the cached SkPicture.
size_t picture_memory_usage_;
DiscardableImageMap image_map_;
friend class base::RefCountedThreadSafe<DisplayItemList>;
FRIEND_TEST_ALL_PREFIXES(DisplayItemListTest, ApproximateMemoryUsage);
} // namespace cc