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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 "cc/layers/picture_layer.h"
#include "base/auto_reset.h"
#include "cc/layers/content_layer_client.h"
#include "cc/layers/picture_layer_impl.h"
#include "cc/trees/layer_tree_impl.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"
#include "ui/gfx/geometry/rect_conversions.h"
namespace cc {
scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
return make_scoped_refptr(new PictureLayer(client));
}
PictureLayer::PictureLayer(ContentLayerClient* client)
: client_(client),
instrumentation_object_tracker_(id()),
update_source_frame_number_(-1),
can_use_lcd_text_last_frame_(can_use_lcd_text()) {
}
PictureLayer::~PictureLayer() {
}
scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
return PictureLayerImpl::Create(tree_impl, id());
}
void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
Layer::PushPropertiesTo(base_layer);
PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
int source_frame_number = layer_tree_host()->source_frame_number();
gfx::Size impl_bounds = layer_impl->bounds();
gfx::Size pile_bounds = pile_.tiling_size();
// If update called, then pile size must match bounds pushed to impl layer.
DCHECK_IMPLIES(update_source_frame_number_ == source_frame_number,
impl_bounds == pile_bounds)
<< " bounds " << impl_bounds.ToString() << " pile "
<< pile_bounds.ToString();
if (update_source_frame_number_ != source_frame_number &&
pile_bounds != impl_bounds) {
// Update may not get called for the layer (if it's not in the viewport
// for example, even though it has resized making the pile no longer
// valid. In this case just destroy the pile.
pile_.SetEmptyBounds();
}
// Unlike other properties, invalidation must always be set on layer_impl.
// See PictureLayerImpl::PushPropertiesTo for more details.
layer_impl->invalidation_.Clear();
layer_impl->invalidation_.Swap(&pile_invalidation_);
layer_impl->UpdatePile(PicturePileImpl::CreateFromOther(&pile_));
}
void PictureLayer::SetLayerTreeHost(LayerTreeHost* host) {
Layer::SetLayerTreeHost(host);
if (host) {
pile_.SetMinContentsScale(host->settings().minimum_contents_scale);
pile_.SetTileGridSize(host->settings().default_tile_grid_size);
pile_.set_slow_down_raster_scale_factor(
host->debug_state().slow_down_raster_scale_factor);
pile_.set_show_debug_picture_borders(
host->debug_state().show_picture_borders);
}
}
void PictureLayer::SetNeedsDisplayRect(const gfx::Rect& layer_rect) {
if (!layer_rect.IsEmpty()) {
// Clamp invalidation to the layer bounds.
pending_invalidation_.Union(
gfx::IntersectRects(layer_rect, gfx::Rect(bounds())));
}
Layer::SetNeedsDisplayRect(layer_rect);
}
bool PictureLayer::Update(ResourceUpdateQueue* queue,
const OcclusionTracker<Layer>* occlusion) {
update_source_frame_number_ = layer_tree_host()->source_frame_number();
bool updated = Layer::Update(queue, occlusion);
{
base::AutoReset<bool> ignore_set_needs_commit(&ignore_set_needs_commit_,
true);
UpdateCanUseLCDText();
}
gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
visible_content_rect(), 1.f / contents_scale_x());
gfx::Size layer_size = paint_properties().bounds;
if (last_updated_visible_content_rect_ == visible_content_rect() &&
pile_.tiling_size() == layer_size && pending_invalidation_.IsEmpty()) {
// Only early out if the visible content rect of this layer hasn't changed.
return updated;
}
TRACE_EVENT1("cc", "PictureLayer::Update",
"source_frame_number",
layer_tree_host()->source_frame_number());
devtools_instrumentation::ScopedLayerTreeTask update_layer(
devtools_instrumentation::kUpdateLayer, id(), layer_tree_host()->id());
// Calling paint in WebKit can sometimes cause invalidations, so save
// off the invalidation prior to calling update.
pending_invalidation_.Swap(&pile_invalidation_);
pending_invalidation_.Clear();
if (layer_tree_host()->settings().record_full_layer) {
// Workaround for http://crbug.com/235910 - to retain backwards compat
// the full page content must always be provided in the picture layer.
visible_layer_rect = gfx::Rect(layer_size);
}
// UpdateAndExpandInvalidation will give us an invalidation that covers
// anything not explicitly recorded in this frame. We give this region
// to the impl side so that it drops tiles that may not have a recording
// for them.
DCHECK(client_);
updated |=
pile_.UpdateAndExpandInvalidation(client_,
&pile_invalidation_,
SafeOpaqueBackgroundColor(),
contents_opaque(),
client_->FillsBoundsCompletely(),
layer_size,
visible_layer_rect,
update_source_frame_number_,
Picture::RECORD_NORMALLY,
rendering_stats_instrumentation());
last_updated_visible_content_rect_ = visible_content_rect();
if (updated) {
SetNeedsPushProperties();
} else {
// If this invalidation did not affect the pile, then it can be cleared as
// an optimization.
pile_invalidation_.Clear();
}
return updated;
}
void PictureLayer::SetIsMask(bool is_mask) {
pile_.set_is_mask(is_mask);
}
bool PictureLayer::SupportsLCDText() const {
return true;
}
void PictureLayer::UpdateCanUseLCDText() {
if (can_use_lcd_text_last_frame_ == can_use_lcd_text())
return;
can_use_lcd_text_last_frame_ = can_use_lcd_text();
if (client_)
client_->DidChangeLayerCanUseLCDText();
}
skia::RefPtr<SkPicture> PictureLayer::GetPicture() const {
// We could either flatten the PicturePile into a single SkPicture,
// or paint a fresh one depending on what we intend to do with the
// picture. For now we just paint a fresh one to get consistent results.
if (!DrawsContent())
return skia::RefPtr<SkPicture>();
int width = bounds().width();
int height = bounds().height();
SkPictureRecorder recorder;
SkCanvas* canvas = recorder.beginRecording(width, height, nullptr, 0);
client_->PaintContents(canvas,
gfx::Rect(width, height),
ContentLayerClient::GRAPHICS_CONTEXT_ENABLED);
skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
return picture;
}
bool PictureLayer::IsSuitableForGpuRasterization() const {
return pile_.is_suitable_for_gpu_rasterization();
}
void PictureLayer::ClearClient() {
client_ = nullptr;
UpdateDrawsContent(HasDrawableContent());
}
bool PictureLayer::HasDrawableContent() const {
return client_ && Layer::HasDrawableContent();
}
void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
benchmark->RunOnLayer(this);
}
} // namespace cc
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