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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.
#include "base/debug/trace_event.h"
#include "cc/picture_pile_impl.h"
#include "cc/region.h"
#include "cc/rendering_stats.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkSize.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/skia_util.h"
namespace cc {
scoped_refptr<PicturePileImpl> PicturePileImpl::Create() {
return make_scoped_refptr(new PicturePileImpl());
}
PicturePileImpl::PicturePileImpl()
: slow_down_raster_scale_factor_for_debug_(0) {
}
PicturePileImpl::~PicturePileImpl() {
}
PicturePileImpl* PicturePileImpl::GetCloneForDrawingOnThread(
base::Thread* thread) {
// Do we have a clone for this thread yet?
CloneMap::iterator it = clones_.find(thread->thread_id());
if (it != clones_.end())
return it->second;
// Create clone for this thread.
scoped_refptr<PicturePileImpl> clone = CloneForDrawing();
clones_[thread->thread_id()] = clone;
return clone;
}
scoped_refptr<PicturePileImpl> PicturePileImpl::CloneForDrawing() const {
TRACE_EVENT0("cc", "PicturePileImpl::CloneForDrawing");
scoped_refptr<PicturePileImpl> clone = Create();
clone->tiling_ = tiling_;
for (PictureListMap::const_iterator map_iter = picture_list_map_.begin();
map_iter != picture_list_map_.end(); ++map_iter) {
const PictureList& this_pic_list = map_iter->second;
PictureList& clone_pic_list = clone->picture_list_map_[map_iter->first];
for (PictureList::const_iterator pic_iter = this_pic_list.begin();
pic_iter != this_pic_list.end(); ++pic_iter) {
clone_pic_list.push_back((*pic_iter)->Clone());
}
}
clone->min_contents_scale_ = min_contents_scale_;
clone->set_slow_down_raster_scale_factor(
slow_down_raster_scale_factor_for_debug_);
return clone;
}
void PicturePileImpl::Raster(
SkCanvas* canvas,
gfx::Rect content_rect,
float contents_scale,
int64* total_pixels_rasterized) {
DCHECK(contents_scale >= min_contents_scale_);
canvas->save();
canvas->translate(-content_rect.x(), -content_rect.y());
canvas->clipRect(gfx::RectToSkRect(content_rect));
gfx::Rect layer_rect = gfx::ToEnclosingRect(
gfx::ScaleRect(content_rect, 1.f / contents_scale));
Region unclipped(content_rect);
for (TilingData::Iterator tile_iter(&tiling_, layer_rect);
tile_iter; ++tile_iter) {
PictureListMap::iterator map_iter =
picture_list_map_.find(tile_iter.index());
if (map_iter == picture_list_map_.end())
continue;
PictureList& pic_list= map_iter->second;
if (pic_list.empty())
continue;
// Raster through the picture list top down, using clips to make sure that
// pictures on top are not overdrawn by pictures on the bottom.
for (PictureList::reverse_iterator i = pic_list.rbegin();
i != pic_list.rend(); ++i) {
// This is intentionally *enclosed* rect, so that the clip is aligned on
// integral post-scale content pixels and does not extend past the edges
// of the picture's layer rect. The min_contents_scale enforces that
// enough buffer pixels have been added such that the enclosed rect
// encompasses all invalidated pixels at any larger scale level.
gfx::Rect content_clip = gfx::ToEnclosedRect(
gfx::ScaleRect((*i)->LayerRect(), contents_scale));
if (!unclipped.Intersects(content_clip))
continue;
if (slow_down_raster_scale_factor_for_debug_) {
for (int j = 0; j < slow_down_raster_scale_factor_for_debug_; ++j)
(*i)->Raster(canvas, content_clip, contents_scale);
} else {
(*i)->Raster(canvas, content_clip, contents_scale);
}
// Don't allow pictures underneath to draw where this picture did.
canvas->clipRect(
gfx::RectToSkRect(content_clip),
SkRegion::kDifference_Op);
unclipped.Subtract(content_clip);
total_pixels_rasterized +=
content_clip.width() * content_clip.height();
}
}
canvas->restore();
}
void PicturePileImpl::GatherPixelRefs(
gfx::Rect content_rect,
float contents_scale,
std::list<skia::LazyPixelRef*>& pixel_refs) {
std::list<skia::LazyPixelRef*> result;
gfx::Rect layer_rect = gfx::ToEnclosingRect(
gfx::ScaleRect(content_rect, 1.f / contents_scale));
for (TilingData::Iterator tile_iter(&tiling_, layer_rect);
tile_iter; ++tile_iter) {
PictureListMap::iterator map_iter =
picture_list_map_.find(tile_iter.index());
if (map_iter == picture_list_map_.end())
continue;
PictureList& pic_list = map_iter->second;
for (PictureList::const_iterator i = pic_list.begin();
i != pic_list.end(); ++i) {
(*i)->GatherPixelRefs(layer_rect, result);
pixel_refs.splice(pixel_refs.end(), result);
}
}
}
void PicturePileImpl::PushPropertiesTo(PicturePileImpl* other) {
PicturePileBase::PushPropertiesTo(other);
other->clones_ = clones_;
}
skia::RefPtr<SkPicture> PicturePileImpl::GetFlattenedPicture() {
TRACE_EVENT0("cc", "PicturePileImpl::GetFlattenedPicture");
gfx::Rect layer_rect(tiling_.total_size());
skia::RefPtr<SkPicture> picture = skia::AdoptRef(new SkPicture);
if (layer_rect.IsEmpty())
return picture;
SkCanvas* canvas = picture->beginRecording(
layer_rect.width(),
layer_rect.height(),
SkPicture::kUsePathBoundsForClip_RecordingFlag);
int64 total_pixels_rasterized = 0;
Raster(canvas, layer_rect, 1.0, &total_pixels_rasterized);
picture->endRecording();
return picture;
}
bool PicturePileImpl::IsCheapInRect(
gfx::Rect content_rect, float contents_scale) const {
gfx::Rect layer_rect = gfx::ToEnclosingRect(
gfx::ScaleRect(content_rect, 1.f / contents_scale));
for (TilingData::Iterator tile_iter(&tiling_, layer_rect);
tile_iter; ++tile_iter) {
PictureListMap::const_iterator map_iter =
picture_list_map_.find(tile_iter.index());
if (map_iter == picture_list_map_.end())
continue;
const PictureList& pic_list = map_iter->second;
for (PictureList::const_iterator i = pic_list.begin();
i != pic_list.end(); ++i) {
if (!(*i)->LayerRect().Intersects(layer_rect) || !(*i)->HasRecording())
continue;
if (!(*i)->IsCheapInRect(layer_rect))
return false;
}
}
return true;
}
} // namespace cc
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