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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/debug/rendering_stats.h"
#include "cc/layers/content_layer_client.h"
#include "cc/resources/picture.h"
#include "skia/ext/analysis_canvas.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkData.h"
#include "third_party/skia/include/core/SkDrawFilter.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/utils/SkPictureUtils.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/skia_util.h"
namespace {
// URI label for a lazily decoded SkPixelRef.
const char kLabelLazyDecoded[] = "lazy";
class DisableLCDTextFilter : public SkDrawFilter {
public:
// SkDrawFilter interface.
virtual bool filter(SkPaint* paint, SkDrawFilter::Type type) {
if (type != SkDrawFilter::kText_Type)
return true;
paint->setLCDRenderText(false);
return true;
}
};
}
namespace cc {
scoped_refptr<Picture> Picture::Create(gfx::Rect layer_rect) {
return make_scoped_refptr(new Picture(layer_rect));
}
Picture::Picture(gfx::Rect layer_rect)
: layer_rect_(layer_rect) {
}
Picture::Picture(const skia::RefPtr<SkPicture>& picture,
gfx::Rect layer_rect,
gfx::Rect opaque_rect) :
layer_rect_(layer_rect),
opaque_rect_(opaque_rect),
picture_(picture) {
}
Picture::~Picture() {
}
scoped_refptr<Picture> Picture::GetCloneForDrawingOnThread(
unsigned thread_index) const {
// SkPicture is not thread-safe to rasterize with, this returns a clone
// to rasterize with on a specific thread.
CHECK_GT(clones_.size(), thread_index);
return clones_[thread_index];
}
void Picture::CloneForDrawing(int num_threads) {
TRACE_EVENT1("cc", "Picture::CloneForDrawing", "num_threads", num_threads);
DCHECK(picture_);
scoped_array<SkPicture> clones(new SkPicture[num_threads]);
picture_->clone(&clones[0], num_threads);
clones_.clear();
for (int i = 0; i < num_threads; i++) {
scoped_refptr<Picture> clone = make_scoped_refptr(
new Picture(skia::AdoptRef(new SkPicture(clones[i])),
layer_rect_,
opaque_rect_));
clones_.push_back(clone);
}
}
void Picture::Record(ContentLayerClient* painter,
RenderingStats* stats,
const SkTileGridPicture::TileGridInfo& tile_grid_info) {
TRACE_EVENT2("cc", "Picture::Record",
"width", layer_rect_.width(), "height", layer_rect_.height());
// Record() should only be called once.
DCHECK(!picture_);
DCHECK(!tile_grid_info.fTileInterval.isEmpty());
picture_ = skia::AdoptRef(new SkTileGridPicture(
layer_rect_.width(), layer_rect_.height(), tile_grid_info));
SkCanvas* canvas = picture_->beginRecording(
layer_rect_.width(),
layer_rect_.height(),
SkPicture::kUsePathBoundsForClip_RecordingFlag |
SkPicture::kOptimizeForClippedPlayback_RecordingFlag);
canvas->save();
canvas->translate(SkFloatToScalar(-layer_rect_.x()),
SkFloatToScalar(-layer_rect_.y()));
SkPaint paint;
paint.setAntiAlias(false);
paint.setXfermodeMode(SkXfermode::kClear_Mode);
SkRect layer_skrect = SkRect::MakeXYWH(layer_rect_.x(),
layer_rect_.y(),
layer_rect_.width(),
layer_rect_.height());
canvas->clipRect(layer_skrect);
canvas->drawRect(layer_skrect, paint);
gfx::RectF opaque_layer_rect;
base::TimeTicks begin_paint_time;
if (stats)
begin_paint_time = base::TimeTicks::Now();
painter->PaintContents(canvas, layer_rect_, &opaque_layer_rect);
if (stats) {
stats->total_paint_time += base::TimeTicks::Now() - begin_paint_time;
stats->total_pixels_painted +=
layer_rect_.width() * layer_rect_.height();
}
canvas->restore();
picture_->endRecording();
opaque_rect_ = gfx::ToEnclosedRect(opaque_layer_rect);
}
void Picture::Raster(
SkCanvas* canvas,
gfx::Rect content_rect,
float contents_scale,
bool enable_lcd_text) {
TRACE_EVENT2("cc", "Picture::Raster",
"layer width", layer_rect_.width(),
"layer height", layer_rect_.height());
DCHECK(picture_);
DisableLCDTextFilter disable_lcd_text_filter;
canvas->save();
canvas->clipRect(gfx::RectToSkRect(content_rect));
canvas->scale(contents_scale, contents_scale);
canvas->translate(layer_rect_.x(), layer_rect_.y());
// Pictures by default have LCD text enabled.
if (!enable_lcd_text)
canvas->setDrawFilter(&disable_lcd_text_filter);
canvas->drawPicture(*picture_);
canvas->restore();
}
void Picture::GatherPixelRefs(const gfx::Rect& layer_rect,
std::list<skia::LazyPixelRef*>& pixel_ref_list) {
DCHECK(picture_);
SkData* pixel_refs = SkPictureUtils::GatherPixelRefs(
picture_.get(), SkRect::MakeXYWH(layer_rect.x(),
layer_rect.y(),
layer_rect.width(),
layer_rect.height()));
if (!pixel_refs)
return;
void* data = const_cast<void*>(pixel_refs->data());
if (!data) {
pixel_refs->unref();
return;
}
SkPixelRef** refs = reinterpret_cast<SkPixelRef**>(data);
for (unsigned int i = 0; i < pixel_refs->size() / sizeof(SkPixelRef*); ++i) {
if (*refs && (*refs)->getURI() && !strncmp(
(*refs)->getURI(), kLabelLazyDecoded, 4)) {
pixel_ref_list.push_back(static_cast<skia::LazyPixelRef*>(*refs));
}
refs++;
}
pixel_refs->unref();
}
} // namespace cc
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