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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 "cc/resources/display_item_list.h"
#include <string>
#include "base/trace_event/trace_event.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/base/math_util.h"
#include "cc/debug/picture_debug_util.h"
#include "cc/debug/traced_picture.h"
#include "cc/debug/traced_value.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkDrawPictureCallback.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"
#include "third_party/skia/include/utils/SkPictureUtils.h"
#include "ui/gfx/skia_util.h"
namespace cc {
DisplayItemList::DisplayItemList()
: is_suitable_for_gpu_rasterization_(true), approximate_op_count_(0) {
}
scoped_refptr<DisplayItemList> DisplayItemList::Create() {
return make_scoped_refptr(new DisplayItemList());
}
DisplayItemList::~DisplayItemList() {
}
void DisplayItemList::Raster(SkCanvas* canvas,
SkDrawPictureCallback* callback,
float contents_scale) const {
if (!picture_) {
canvas->save();
canvas->scale(contents_scale, contents_scale);
for (size_t i = 0; i < items_.size(); ++i) {
items_[i]->Raster(canvas, callback);
}
canvas->restore();
} else {
DCHECK(picture_);
canvas->save();
canvas->scale(contents_scale, contents_scale);
canvas->translate(layer_rect_.x(), layer_rect_.y());
if (callback) {
// If we have a callback, we need to call |draw()|, |drawPicture()|
// doesn't take a callback. This is used by |AnalysisCanvas| to early
// out.
picture_->playback(canvas, callback);
} else {
// Prefer to call |drawPicture()| on the canvas since it could place the
// entire picture on the canvas instead of parsing the skia operations.
canvas->drawPicture(picture_.get());
}
canvas->restore();
}
}
void DisplayItemList::CreateAndCacheSkPicture() {
// Convert to an SkPicture for faster rasterization. Code is identical to
// that in Picture::Record.
SkRTreeFactory factory;
SkPictureRecorder recorder;
skia::RefPtr<SkCanvas> canvas;
canvas = skia::SharePtr(recorder.beginRecording(
layer_rect_.width(), layer_rect_.height(), &factory));
canvas->translate(-layer_rect_.x(), -layer_rect_.y());
canvas->clipRect(gfx::RectToSkRect(layer_rect_));
for (size_t i = 0; i < items_.size(); ++i)
items_[i]->Raster(canvas.get(), NULL);
picture_ = skia::AdoptRef(recorder.endRecordingAsPicture());
DCHECK(picture_);
}
void DisplayItemList::AppendItem(scoped_ptr<DisplayItem> item) {
is_suitable_for_gpu_rasterization_ &= item->IsSuitableForGpuRasterization();
approximate_op_count_ += item->ApproximateOpCount();
items_.push_back(item.Pass());
}
bool DisplayItemList::IsSuitableForGpuRasterization() const {
// This is more permissive than Picture's implementation, since none of the
// items might individually trigger a veto even though they collectively have
// enough "bad" operations that a corresponding Picture would get vetoed.
return is_suitable_for_gpu_rasterization_;
}
int DisplayItemList::ApproximateOpCount() const {
return approximate_op_count_;
}
size_t DisplayItemList::PictureMemoryUsage() const {
size_t total_size = 0;
for (const auto& item : items_) {
total_size += item->PictureMemoryUsage();
}
if (picture_)
total_size += SkPictureUtils::ApproximateBytesUsed(picture_.get());
return total_size;
}
scoped_refptr<base::trace_event::ConvertableToTraceFormat>
DisplayItemList::AsValue() const {
scoped_refptr<base::trace_event::TracedValue> state =
new base::trace_event::TracedValue();
state->SetInteger("length", items_.size());
state->BeginArray("params.items");
for (const DisplayItem* item : items_) {
item->AsValueInto(state.get());
}
state->EndArray();
state->SetValue("params.layer_rect",
MathUtil::AsValue(layer_rect_).release());
SkPictureRecorder recorder;
SkCanvas* canvas =
recorder.beginRecording(layer_rect_.width(), layer_rect_.height());
canvas->translate(-layer_rect_.x(), -layer_rect_.y());
canvas->clipRect(gfx::RectToSkRect(layer_rect_));
for (size_t i = 0; i < items_.size(); ++i)
items_[i]->RasterForTracing(canvas);
skia::RefPtr<SkPicture> picture =
skia::AdoptRef(recorder.endRecordingAsPicture());
std::string b64_picture;
PictureDebugUtil::SerializeAsBase64(picture.get(), &b64_picture);
state->SetString("skp64", b64_picture);
return state;
}
void DisplayItemList::EmitTraceSnapshot() const {
TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
TRACE_DISABLED_BY_DEFAULT("cc.debug.picture") ","
TRACE_DISABLED_BY_DEFAULT("devtools.timeline.picture"),
"cc::DisplayItemList", this, AsValue());
}
void DisplayItemList::GatherPixelRefs(const gfx::Size& grid_cell_size) {
// This should be only called once, and only after CreateAndCacheSkPicture.
DCHECK(picture_);
DCHECK(!pixel_refs_);
pixel_refs_ = make_scoped_ptr(new PixelRefMap(grid_cell_size));
if (!picture_->willPlayBackBitmaps())
return;
pixel_refs_->GatherPixelRefsFromPicture(picture_.get());
}
} // namespace cc
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