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mojo / mojo-tools / 101a533ca6c8cfa47a10796e922b0a3d333ceb11 / . / cc / trees / layer_tree_host.cc
blob: f4780789394c447a1b3a56cfb5925ef325dec6a1 [file] [log] [blame]
// Copyright 2011 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/trees/layer_tree_host.h"
#include <algorithm>
#include <stack>
#include <string>
#include "base/atomic_sequence_num.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/trace_event/trace_event.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/animation/animation_registrar.h"
#include "cc/animation/layer_animation_controller.h"
#include "cc/base/math_util.h"
#include "cc/debug/devtools_instrumentation.h"
#include "cc/debug/rendering_stats_instrumentation.h"
#include "cc/input/layer_selection_bound.h"
#include "cc/input/page_scale_animation.h"
#include "cc/input/top_controls_manager.h"
#include "cc/layers/heads_up_display_layer.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_iterator.h"
#include "cc/layers/painted_scrollbar_layer.h"
#include "cc/layers/render_surface.h"
#include "cc/resources/prioritized_resource_manager.h"
#include "cc/resources/ui_resource_request.h"
#include "cc/scheduler/begin_frame_source.h"
#include "cc/trees/layer_tree_host_client.h"
#include "cc/trees/layer_tree_host_common.h"
#include "cc/trees/layer_tree_host_impl.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/occlusion_tracker.h"
#include "cc/trees/single_thread_proxy.h"
#include "cc/trees/thread_proxy.h"
#include "cc/trees/tree_synchronizer.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/vector2d_conversions.h"
namespace {
static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
}
namespace cc {
RendererCapabilities::RendererCapabilities(ResourceFormat best_texture_format,
bool allow_partial_texture_updates,
int max_texture_size,
bool using_shared_memory_resources)
: best_texture_format(best_texture_format),
allow_partial_texture_updates(allow_partial_texture_updates),
max_texture_size(max_texture_size),
using_shared_memory_resources(using_shared_memory_resources) {}
RendererCapabilities::RendererCapabilities()
: best_texture_format(RGBA_8888),
allow_partial_texture_updates(false),
max_texture_size(0),
using_shared_memory_resources(false) {}
RendererCapabilities::~RendererCapabilities() {}
scoped_ptr<LayerTreeHost> LayerTreeHost::CreateThreaded(
LayerTreeHostClient* client,
SharedBitmapManager* shared_bitmap_manager,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
const LayerTreeSettings& settings,
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
scoped_ptr<BeginFrameSource> external_begin_frame_source) {
DCHECK(main_task_runner.get());
DCHECK(impl_task_runner.get());
scoped_ptr<LayerTreeHost> layer_tree_host(new LayerTreeHost(
client, shared_bitmap_manager, gpu_memory_buffer_manager, settings));
layer_tree_host->InitializeThreaded(main_task_runner,
impl_task_runner,
external_begin_frame_source.Pass());
return layer_tree_host.Pass();
}
scoped_ptr<LayerTreeHost> LayerTreeHost::CreateSingleThreaded(
LayerTreeHostClient* client,
LayerTreeHostSingleThreadClient* single_thread_client,
SharedBitmapManager* shared_bitmap_manager,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
const LayerTreeSettings& settings,
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_ptr<BeginFrameSource> external_begin_frame_source) {
scoped_ptr<LayerTreeHost> layer_tree_host(new LayerTreeHost(
client, shared_bitmap_manager, gpu_memory_buffer_manager, settings));
layer_tree_host->InitializeSingleThreaded(single_thread_client,
main_task_runner,
external_begin_frame_source.Pass());
return layer_tree_host.Pass();
}
LayerTreeHost::LayerTreeHost(
LayerTreeHostClient* client,
SharedBitmapManager* shared_bitmap_manager,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
const LayerTreeSettings& settings)
: micro_benchmark_controller_(this),
next_ui_resource_id_(1),
inside_begin_main_frame_(false),
needs_full_tree_sync_(true),
client_(client),
source_frame_number_(0),
rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
output_surface_lost_(true),
settings_(settings),
debug_state_(settings.initial_debug_state),
top_controls_shrink_blink_size_(false),
top_controls_height_(0.f),
top_controls_shown_ratio_(0.f),
device_scale_factor_(1.f),
visible_(true),
page_scale_factor_(1.f),
min_page_scale_factor_(1.f),
max_page_scale_factor_(1.f),
has_gpu_rasterization_trigger_(false),
content_is_suitable_for_gpu_rasterization_(true),
gpu_rasterization_histogram_recorded_(false),
background_color_(SK_ColorWHITE),
has_transparent_background_(false),
partial_texture_update_requests_(0),
did_complete_scale_animation_(false),
in_paint_layer_contents_(false),
total_frames_used_for_lcd_text_metrics_(0),
id_(s_layer_tree_host_sequence_number.GetNext() + 1),
next_commit_forces_redraw_(false),
shared_bitmap_manager_(shared_bitmap_manager),
gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
surface_id_namespace_(0u),
next_surface_sequence_(1u) {
if (settings_.accelerated_animation_enabled)
animation_registrar_ = AnimationRegistrar::Create();
rendering_stats_instrumentation_->set_record_rendering_stats(
debug_state_.RecordRenderingStats());
}
void LayerTreeHost::InitializeThreaded(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
scoped_ptr<BeginFrameSource> external_begin_frame_source) {
InitializeProxy(ThreadProxy::Create(this,
main_task_runner,
impl_task_runner,
external_begin_frame_source.Pass()));
}
void LayerTreeHost::InitializeSingleThreaded(
LayerTreeHostSingleThreadClient* single_thread_client,
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_ptr<BeginFrameSource> external_begin_frame_source) {
InitializeProxy(
SingleThreadProxy::Create(this,
single_thread_client,
main_task_runner,
external_begin_frame_source.Pass()));
}
void LayerTreeHost::InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing) {
InitializeProxy(proxy_for_testing.Pass());
}
void LayerTreeHost::InitializeProxy(scoped_ptr<Proxy> proxy) {
TRACE_EVENT0("cc", "LayerTreeHost::InitializeForReal");
proxy_ = proxy.Pass();
proxy_->Start();
if (settings_.accelerated_animation_enabled) {
animation_registrar_->set_supports_scroll_animations(
proxy_->SupportsImplScrolling());
}
}
LayerTreeHost::~LayerTreeHost() {
TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
if (root_layer_.get())
root_layer_->SetLayerTreeHost(NULL);
DCHECK(swap_promise_monitor_.empty());
BreakSwapPromises(SwapPromise::COMMIT_FAILS);
if (proxy_) {
DCHECK(proxy_->IsMainThread());
proxy_->Stop();
}
// We must clear any pointers into the layer tree prior to destroying it.
RegisterViewportLayers(NULL, NULL, NULL, NULL);
if (root_layer_.get()) {
// The layer tree must be destroyed before the layer tree host. We've
// made a contract with our animation controllers that the registrar
// will outlive them, and we must make good.
root_layer_ = NULL;
}
}
void LayerTreeHost::SetLayerTreeHostClientReady() {
proxy_->SetLayerTreeHostClientReady();
}
static void LayerTreeHostOnOutputSurfaceCreatedCallback(Layer* layer) {
layer->OnOutputSurfaceCreated();
}
void LayerTreeHost::DeleteContentsTexturesOnImplThread(
ResourceProvider* resource_provider) {
DCHECK(proxy_->IsImplThread());
if (contents_texture_manager_)
contents_texture_manager_->ClearAllMemory(resource_provider);
}
void LayerTreeHost::WillBeginMainFrame() {
devtools_instrumentation::WillBeginMainThreadFrame(id(),
source_frame_number());
client_->WillBeginMainFrame();
}
void LayerTreeHost::DidBeginMainFrame() {
client_->DidBeginMainFrame();
}
void LayerTreeHost::BeginMainFrame(const BeginFrameArgs& args) {
inside_begin_main_frame_ = true;
client_->BeginMainFrame(args);
inside_begin_main_frame_ = false;
}
void LayerTreeHost::DidStopFlinging() {
proxy_->MainThreadHasStoppedFlinging();
}
void LayerTreeHost::Layout() {
client_->Layout();
}
void LayerTreeHost::BeginCommitOnImplThread(LayerTreeHostImpl* host_impl) {
DCHECK(proxy_->IsImplThread());
TRACE_EVENT0("cc", "LayerTreeHost::CommitTo");
}
// This function commits the LayerTreeHost to an impl tree. When modifying
// this function, keep in mind that the function *runs* on the impl thread! Any
// code that is logically a main thread operation, e.g. deletion of a Layer,
// should be delayed until the LayerTreeHost::CommitComplete, which will run
// after the commit, but on the main thread.
void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
DCHECK(proxy_->IsImplThread());
// If there are linked evicted backings, these backings' resources may be put
// into the impl tree, so we can't draw yet. Determine this before clearing
// all evicted backings.
bool new_impl_tree_has_no_evicted_resources = false;
if (contents_texture_manager_) {
new_impl_tree_has_no_evicted_resources =
!contents_texture_manager_->LinkedEvictedBackingsExist();
// If the memory limit has been increased since this now-finishing
// commit began, and the extra now-available memory would have been used,
// then request another commit.
if (contents_texture_manager_->MaxMemoryLimitBytes() <
host_impl->memory_allocation_limit_bytes() &&
contents_texture_manager_->MaxMemoryLimitBytes() <
contents_texture_manager_->MaxMemoryNeededBytes()) {
host_impl->SetNeedsCommit();
}
host_impl->set_max_memory_needed_bytes(
contents_texture_manager_->MaxMemoryNeededBytes());
contents_texture_manager_->UpdateBackingsState(
host_impl->resource_provider());
contents_texture_manager_->ReduceMemory(host_impl->resource_provider());
}
LayerTreeImpl* sync_tree = host_impl->sync_tree();
if (next_commit_forces_redraw_) {
sync_tree->ForceRedrawNextActivation();
next_commit_forces_redraw_ = false;
}
sync_tree->set_source_frame_number(source_frame_number());
if (needs_full_tree_sync_) {
sync_tree->SetRootLayer(TreeSynchronizer::SynchronizeTrees(
root_layer(), sync_tree->DetachLayerTree(), sync_tree));
}
sync_tree->set_needs_full_tree_sync(needs_full_tree_sync_);
needs_full_tree_sync_ = false;
if (hud_layer_.get()) {
LayerImpl* hud_impl = LayerTreeHostCommon::FindLayerInSubtree(
sync_tree->root_layer(), hud_layer_->id());
sync_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(hud_impl));
} else {
sync_tree->set_hud_layer(NULL);
}
sync_tree->set_background_color(background_color_);
sync_tree->set_has_transparent_background(has_transparent_background_);
if (page_scale_layer_.get() && inner_viewport_scroll_layer_.get()) {
sync_tree->SetViewportLayersFromIds(
overscroll_elasticity_layer_.get() ? overscroll_elasticity_layer_->id()
: Layer::INVALID_ID,
page_scale_layer_->id(), inner_viewport_scroll_layer_->id(),
outer_viewport_scroll_layer_.get() ? outer_viewport_scroll_layer_->id()
: Layer::INVALID_ID);
DCHECK(inner_viewport_scroll_layer_->IsContainerForFixedPositionLayers());
} else {
sync_tree->ClearViewportLayers();
}
sync_tree->RegisterSelection(selection_start_, selection_end_);
sync_tree->PushPageScaleFromMainThread(
page_scale_factor_, min_page_scale_factor_, max_page_scale_factor_);
sync_tree->elastic_overscroll()->PushFromMainThread(elastic_overscroll_);
if (sync_tree->IsActiveTree())
sync_tree->elastic_overscroll()->PushPendingToActive();
sync_tree->PassSwapPromises(&swap_promise_list_);
sync_tree->set_top_controls_shrink_blink_size(
top_controls_shrink_blink_size_);
sync_tree->set_top_controls_height(top_controls_height_);
sync_tree->PushTopControlsFromMainThread(top_controls_shown_ratio_);
host_impl->SetUseGpuRasterization(UseGpuRasterization());
host_impl->set_gpu_rasterization_status(GetGpuRasterizationStatus());
RecordGpuRasterizationHistogram();
host_impl->SetViewportSize(device_viewport_size_);
host_impl->SetDeviceScaleFactor(device_scale_factor_);
host_impl->SetDebugState(debug_state_);
if (pending_page_scale_animation_) {
sync_tree->SetPendingPageScaleAnimation(
pending_page_scale_animation_.Pass());
}
if (!ui_resource_request_queue_.empty()) {
sync_tree->set_ui_resource_request_queue(ui_resource_request_queue_);
ui_resource_request_queue_.clear();
}
DCHECK(!sync_tree->ViewportSizeInvalid());
if (new_impl_tree_has_no_evicted_resources) {
if (sync_tree->ContentsTexturesPurged())
sync_tree->ResetContentsTexturesPurged();
}
sync_tree->set_has_ever_been_drawn(false);
{
TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
}
micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
}
void LayerTreeHost::WillCommit() {
client_->WillCommit();
}
void LayerTreeHost::UpdateHudLayer() {
if (debug_state_.ShowHudInfo()) {
if (!hud_layer_.get())
hud_layer_ = HeadsUpDisplayLayer::Create();
if (root_layer_.get() && !hud_layer_->parent())
root_layer_->AddChild(hud_layer_);
} else if (hud_layer_.get()) {
hud_layer_->RemoveFromParent();
hud_layer_ = NULL;
}
}
void LayerTreeHost::CommitComplete() {
source_frame_number_++;
client_->DidCommit();
if (did_complete_scale_animation_) {
client_->DidCompletePageScaleAnimation();
did_complete_scale_animation_ = false;
}
}
void LayerTreeHost::SetOutputSurface(scoped_ptr<OutputSurface> surface) {
TRACE_EVENT0("cc", "LayerTreeHost::SetOutputSurface");
DCHECK(output_surface_lost_);
DCHECK(surface);
proxy_->SetOutputSurface(surface.Pass());
}
void LayerTreeHost::RequestNewOutputSurface() {
client_->RequestNewOutputSurface();
}
void LayerTreeHost::DidInitializeOutputSurface() {
output_surface_lost_ = false;
if (!contents_texture_manager_ && !settings_.impl_side_painting) {
contents_texture_manager_ =
PrioritizedResourceManager::Create(proxy_.get());
surface_memory_placeholder_ =
contents_texture_manager_->CreateTexture(gfx::Size(), RGBA_8888);
}
if (root_layer()) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer(), base::Bind(&LayerTreeHostOnOutputSurfaceCreatedCallback));
}
client_->DidInitializeOutputSurface();
}
void LayerTreeHost::DidFailToInitializeOutputSurface() {
DCHECK(output_surface_lost_);
client_->DidFailToInitializeOutputSurface();
}
scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
LayerTreeHostImplClient* client) {
DCHECK(proxy_->IsImplThread());
scoped_ptr<LayerTreeHostImpl> host_impl =
LayerTreeHostImpl::Create(settings_,
client,
proxy_.get(),
rendering_stats_instrumentation_.get(),
shared_bitmap_manager_,
gpu_memory_buffer_manager_,
id_);
host_impl->SetUseGpuRasterization(UseGpuRasterization());
shared_bitmap_manager_ = NULL;
gpu_memory_buffer_manager_ = NULL;
if (settings_.calculate_top_controls_position &&
host_impl->top_controls_manager()) {
top_controls_manager_weak_ptr_ =
host_impl->top_controls_manager()->AsWeakPtr();
}
input_handler_weak_ptr_ = host_impl->AsWeakPtr();
return host_impl.Pass();
}
void LayerTreeHost::DidLoseOutputSurface() {
TRACE_EVENT0("cc", "LayerTreeHost::DidLoseOutputSurface");
DCHECK(proxy_->IsMainThread());
if (output_surface_lost_)
return;
output_surface_lost_ = true;
SetNeedsCommit();
}
void LayerTreeHost::FinishAllRendering() {
proxy_->FinishAllRendering();
}
void LayerTreeHost::SetDeferCommits(bool defer_commits) {
proxy_->SetDeferCommits(defer_commits);
}
void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
std::stack<Layer*> layer_stack;
layer_stack.push(root_layer());
while (!layer_stack.empty()) {
Layer* current_layer = layer_stack.top();
layer_stack.pop();
current_layer->SetNeedsDisplay();
for (unsigned int i = 0; i < current_layer->children().size(); i++) {
layer_stack.push(current_layer->child_at(i));
}
}
}
const RendererCapabilities& LayerTreeHost::GetRendererCapabilities() const {
return proxy_->GetRendererCapabilities();
}
void LayerTreeHost::SetNeedsAnimate() {
proxy_->SetNeedsAnimate();
NotifySwapPromiseMonitorsOfSetNeedsCommit();
}
void LayerTreeHost::SetNeedsUpdateLayers() {
proxy_->SetNeedsUpdateLayers();
NotifySwapPromiseMonitorsOfSetNeedsCommit();
}
void LayerTreeHost::SetNeedsCommit() {
if (!prepaint_callback_.IsCancelled()) {
TRACE_EVENT_INSTANT0("cc",
"LayerTreeHost::SetNeedsCommit::cancel prepaint",
TRACE_EVENT_SCOPE_THREAD);
prepaint_callback_.Cancel();
}
proxy_->SetNeedsCommit();
NotifySwapPromiseMonitorsOfSetNeedsCommit();
}
void LayerTreeHost::SetNeedsFullTreeSync() {
needs_full_tree_sync_ = true;
SetNeedsCommit();
}
void LayerTreeHost::SetNeedsRedraw() {
SetNeedsRedrawRect(gfx::Rect(device_viewport_size_));
}
void LayerTreeHost::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
proxy_->SetNeedsRedraw(damage_rect);
}
bool LayerTreeHost::CommitRequested() const {
return proxy_->CommitRequested();
}
bool LayerTreeHost::BeginMainFrameRequested() const {
return proxy_->BeginMainFrameRequested();
}
void LayerTreeHost::SetNextCommitWaitsForActivation() {
proxy_->SetNextCommitWaitsForActivation();
}
void LayerTreeHost::SetNextCommitForcesRedraw() {
next_commit_forces_redraw_ = true;
}
void LayerTreeHost::SetAnimationEvents(
scoped_ptr<AnimationEventsVector> events) {
DCHECK(proxy_->IsMainThread());
for (size_t event_index = 0; event_index < events->size(); ++event_index) {
int event_layer_id = (*events)[event_index].layer_id;
// Use the map of all controllers, not just active ones, since non-active
// controllers may still receive events for impl-only animations.
const AnimationRegistrar::AnimationControllerMap& animation_controllers =
animation_registrar_->all_animation_controllers();
AnimationRegistrar::AnimationControllerMap::const_iterator iter =
animation_controllers.find(event_layer_id);
if (iter != animation_controllers.end()) {
switch ((*events)[event_index].type) {
case AnimationEvent::Started:
(*iter).second->NotifyAnimationStarted((*events)[event_index]);
break;
case AnimationEvent::Finished:
(*iter).second->NotifyAnimationFinished((*events)[event_index]);
break;
case AnimationEvent::Aborted:
(*iter).second->NotifyAnimationAborted((*events)[event_index]);
break;
case AnimationEvent::PropertyUpdate:
(*iter).second->NotifyAnimationPropertyUpdate((*events)[event_index]);
break;
}
}
}
}
void LayerTreeHost::SetRootLayer(scoped_refptr<Layer> root_layer) {
if (root_layer_.get() == root_layer.get())
return;
if (root_layer_.get())
root_layer_->SetLayerTreeHost(NULL);
root_layer_ = root_layer;
if (root_layer_.get()) {
DCHECK(!root_layer_->parent());
root_layer_->SetLayerTreeHost(this);
}
if (hud_layer_.get())
hud_layer_->RemoveFromParent();
// Reset gpu rasterization flag.
// This flag is sticky until a new tree comes along.
content_is_suitable_for_gpu_rasterization_ = true;
gpu_rasterization_histogram_recorded_ = false;
SetNeedsFullTreeSync();
}
void LayerTreeHost::SetDebugState(const LayerTreeDebugState& debug_state) {
LayerTreeDebugState new_debug_state =
LayerTreeDebugState::Unite(settings_.initial_debug_state, debug_state);
if (LayerTreeDebugState::Equal(debug_state_, new_debug_state))
return;
debug_state_ = new_debug_state;
rendering_stats_instrumentation_->set_record_rendering_stats(
debug_state_.RecordRenderingStats());
SetNeedsCommit();
proxy_->SetDebugState(debug_state);
}
bool LayerTreeHost::UseGpuRasterization() const {
if (settings_.gpu_rasterization_forced) {
return true;
} else if (settings_.gpu_rasterization_enabled) {
return has_gpu_rasterization_trigger_ &&
content_is_suitable_for_gpu_rasterization_;
} else {
return false;
}
}
GpuRasterizationStatus LayerTreeHost::GetGpuRasterizationStatus() const {
if (settings_.gpu_rasterization_forced) {
return GpuRasterizationStatus::ON_FORCED;
} else if (settings_.gpu_rasterization_enabled) {
if (!has_gpu_rasterization_trigger_) {
return GpuRasterizationStatus::OFF_VIEWPORT;
} else if (!content_is_suitable_for_gpu_rasterization_) {
return GpuRasterizationStatus::OFF_CONTENT;
} else {
return GpuRasterizationStatus::ON;
}
}
return GpuRasterizationStatus::OFF_DEVICE;
}
void LayerTreeHost::SetHasGpuRasterizationTrigger(bool has_trigger) {
if (has_trigger == has_gpu_rasterization_trigger_)
return;
has_gpu_rasterization_trigger_ = has_trigger;
TRACE_EVENT_INSTANT1("cc",
"LayerTreeHost::SetHasGpuRasterizationTrigger",
TRACE_EVENT_SCOPE_THREAD,
"has_trigger",
has_gpu_rasterization_trigger_);
}
void LayerTreeHost::SetViewportSize(const gfx::Size& device_viewport_size) {
if (device_viewport_size == device_viewport_size_)
return;
device_viewport_size_ = device_viewport_size;
SetNeedsCommit();
}
void LayerTreeHost::SetTopControlsShrinkBlinkSize(bool shrink) {
if (top_controls_shrink_blink_size_ == shrink)
return;
top_controls_shrink_blink_size_ = shrink;
SetNeedsCommit();
}
void LayerTreeHost::SetTopControlsHeight(float height) {
if (top_controls_height_ == height)
return;
top_controls_height_ = height;
SetNeedsCommit();
}
void LayerTreeHost::SetTopControlsShownRatio(float ratio) {
if (top_controls_shown_ratio_ == ratio)
return;
top_controls_shown_ratio_ = ratio;
SetNeedsCommit();
}
void LayerTreeHost::ApplyPageScaleDeltaFromImplSide(float page_scale_delta) {
DCHECK(CommitRequested());
page_scale_factor_ *= page_scale_delta;
}
void LayerTreeHost::SetPageScaleFactorAndLimits(float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor) {
if (page_scale_factor == page_scale_factor_ &&
min_page_scale_factor == min_page_scale_factor_ &&
max_page_scale_factor == max_page_scale_factor_)
return;
page_scale_factor_ = page_scale_factor;
min_page_scale_factor_ = min_page_scale_factor;
max_page_scale_factor_ = max_page_scale_factor;
SetNeedsCommit();
}
void LayerTreeHost::SetVisible(bool visible) {
if (visible_ == visible)
return;
visible_ = visible;
if (!visible)
ReduceMemoryUsage();
proxy_->SetVisible(visible);
}
void LayerTreeHost::SetThrottleFrameProduction(bool throttle) {
proxy_->SetThrottleFrameProduction(throttle);
}
void LayerTreeHost::StartPageScaleAnimation(const gfx::Vector2d& target_offset,
bool use_anchor,
float scale,
base::TimeDelta duration) {
pending_page_scale_animation_.reset(
new PendingPageScaleAnimation(
target_offset,
use_anchor,
scale,
duration));
SetNeedsCommit();
}
void LayerTreeHost::NotifyInputThrottledUntilCommit() {
proxy_->NotifyInputThrottledUntilCommit();
}
void LayerTreeHost::Composite(base::TimeTicks frame_begin_time) {
DCHECK(!proxy_->HasImplThread());
// This function is only valid when not using the scheduler.
DCHECK(!settings_.single_thread_proxy_scheduler);
SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
SetLayerTreeHostClientReady();
proxy->CompositeImmediately(frame_begin_time);
}
bool LayerTreeHost::UpdateLayers(ResourceUpdateQueue* queue) {
DCHECK(!output_surface_lost_);
if (!root_layer())
return false;
DCHECK(!root_layer()->parent());
bool result = UpdateLayers(root_layer(), queue);
micro_benchmark_controller_.DidUpdateLayers();
return result || next_commit_forces_redraw_;
}
void LayerTreeHost::DidCompletePageScaleAnimation() {
did_complete_scale_animation_ = true;
}
static Layer* FindFirstScrollableLayer(Layer* layer) {
if (!layer)
return NULL;
if (layer->scrollable())
return layer;
for (size_t i = 0; i < layer->children().size(); ++i) {
Layer* found = FindFirstScrollableLayer(layer->children()[i].get());
if (found)
return found;
}
return NULL;
}
void LayerTreeHost::RecordGpuRasterizationHistogram() {
// Gpu rasterization is only supported when impl-side painting is enabled.
if (gpu_rasterization_histogram_recorded_ || !settings_.impl_side_painting)
return;
// Record how widely gpu rasterization is enabled.
// This number takes device/gpu whitelisting/backlisting into account.
// Note that we do not consider the forced gpu rasterization mode, which is
// mostly used for debugging purposes.
UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationEnabled",
settings_.gpu_rasterization_enabled);
if (settings_.gpu_rasterization_enabled) {
UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationTriggered",
has_gpu_rasterization_trigger_);
UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationSuitableContent",
content_is_suitable_for_gpu_rasterization_);
// Record how many pages actually get gpu rasterization when enabled.
UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationUsed",
(has_gpu_rasterization_trigger_ &&
content_is_suitable_for_gpu_rasterization_));
}
gpu_rasterization_histogram_recorded_ = true;
}
void LayerTreeHost::CalculateLCDTextMetricsCallback(Layer* layer) {
if (!layer->SupportsLCDText())
return;
lcd_text_metrics_.total_num_cc_layers++;
if (layer->draw_properties().can_use_lcd_text) {
lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text++;
if (layer->contents_opaque())
lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text++;
}
}
bool LayerTreeHost::UsingSharedMemoryResources() {
return GetRendererCapabilities().using_shared_memory_resources;
}
bool LayerTreeHost::UpdateLayers(Layer* root_layer,
ResourceUpdateQueue* queue) {
TRACE_EVENT1("cc", "LayerTreeHost::UpdateLayers",
"source_frame_number", source_frame_number());
RenderSurfaceLayerList update_list;
{
UpdateHudLayer();
Layer* root_scroll = FindFirstScrollableLayer(root_layer);
Layer* page_scale_layer = page_scale_layer_.get();
if (!page_scale_layer && root_scroll)
page_scale_layer = root_scroll->parent();
if (hud_layer_.get()) {
hud_layer_->PrepareForCalculateDrawProperties(
device_viewport_size(), device_scale_factor_);
}
TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::CalcDrawProps");
bool can_render_to_separate_surface = true;
// TODO(vmpstr): Passing 0 as the current render surface layer list id means
// that we won't be able to detect if a layer is part of |update_list|.
// Change this if this information is required.
int render_surface_layer_list_id = 0;
LayerTreeHostCommon::CalcDrawPropsMainInputs inputs(
root_layer, device_viewport_size(), gfx::Transform(),
device_scale_factor_, page_scale_factor_, page_scale_layer,
elastic_overscroll_, overscroll_elasticity_layer_.get(),
GetRendererCapabilities().max_texture_size, settings_.can_use_lcd_text,
settings_.layers_always_allowed_lcd_text,
can_render_to_separate_surface,
settings_.layer_transforms_should_scale_layer_contents,
settings_.verify_property_trees, &update_list,
render_surface_layer_list_id);
LayerTreeHostCommon::CalculateDrawProperties(&inputs);
if (total_frames_used_for_lcd_text_metrics_ <=
kTotalFramesToUseForLCDTextMetrics) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer,
base::Bind(&LayerTreeHost::CalculateLCDTextMetricsCallback,
base::Unretained(this)));
total_frames_used_for_lcd_text_metrics_++;
}
if (total_frames_used_for_lcd_text_metrics_ ==
kTotalFramesToUseForLCDTextMetrics) {
total_frames_used_for_lcd_text_metrics_++;
UMA_HISTOGRAM_PERCENTAGE(
"Renderer4.LCDText.PercentageOfCandidateLayers",
lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text * 100.0 /
lcd_text_metrics_.total_num_cc_layers);
UMA_HISTOGRAM_PERCENTAGE(
"Renderer4.LCDText.PercentageOfAALayers",
lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text * 100.0 /
lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text);
}
}
// Reset partial texture update requests.
partial_texture_update_requests_ = 0;
bool did_paint_content = false;
bool need_more_updates = false;
PaintLayerContents(
update_list, queue, &did_paint_content, &need_more_updates);
if (need_more_updates) {
TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::posting prepaint task");
prepaint_callback_.Reset(base::Bind(&LayerTreeHost::TriggerPrepaint,
base::Unretained(this)));
static base::TimeDelta prepaint_delay =
base::TimeDelta::FromMilliseconds(100);
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE, prepaint_callback_.callback(), prepaint_delay);
}
return did_paint_content;
}
void LayerTreeHost::TriggerPrepaint() {
prepaint_callback_.Cancel();
TRACE_EVENT0("cc", "LayerTreeHost::TriggerPrepaint");
SetNeedsCommit();
}
static void LayerTreeHostReduceMemoryCallback(Layer* layer) {
layer->ReduceMemoryUsage();
}
void LayerTreeHost::ReduceMemoryUsage() {
if (!root_layer())
return;
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer(),
base::Bind(&LayerTreeHostReduceMemoryCallback));
}
void LayerTreeHost::SetPrioritiesForSurfaces(size_t surface_memory_bytes) {
DCHECK(surface_memory_placeholder_);
// Surfaces have a place holder for their memory since they are managed
// independantly but should still be tracked and reduce other memory usage.
surface_memory_placeholder_->SetTextureManager(
contents_texture_manager_.get());
surface_memory_placeholder_->set_request_priority(
PriorityCalculator::RenderSurfacePriority());
surface_memory_placeholder_->SetToSelfManagedMemoryPlaceholder(
surface_memory_bytes);
}
void LayerTreeHost::SetPrioritiesForLayers(
const RenderSurfaceLayerList& update_list) {
PriorityCalculator calculator;
typedef LayerIterator<Layer> LayerIteratorType;
LayerIteratorType end = LayerIteratorType::End(&update_list);
for (LayerIteratorType it = LayerIteratorType::Begin(&update_list);
it != end;
++it) {
if (it.represents_itself()) {
it->SetTexturePriorities(calculator);
} else if (it.represents_target_render_surface()) {
if (it->mask_layer())
it->mask_layer()->SetTexturePriorities(calculator);
if (it->replica_layer() && it->replica_layer()->mask_layer())
it->replica_layer()->mask_layer()->SetTexturePriorities(calculator);
}
}
}
void LayerTreeHost::PrioritizeTextures(
const RenderSurfaceLayerList& render_surface_layer_list) {
if (!contents_texture_manager_)
return;
contents_texture_manager_->ClearPriorities();
size_t memory_for_render_surfaces_metric =
CalculateMemoryForRenderSurfaces(render_surface_layer_list);
SetPrioritiesForLayers(render_surface_layer_list);
SetPrioritiesForSurfaces(memory_for_render_surfaces_metric);
contents_texture_manager_->PrioritizeTextures();
}
size_t LayerTreeHost::CalculateMemoryForRenderSurfaces(
const RenderSurfaceLayerList& update_list) {
size_t readback_bytes = 0;
size_t contents_texture_bytes = 0;
// Start iteration at 1 to skip the root surface as it does not have a texture
// cost.
for (size_t i = 1; i < update_list.size(); ++i) {
Layer* render_surface_layer = update_list.at(i);
RenderSurface* render_surface = render_surface_layer->render_surface();
size_t bytes =
Resource::MemorySizeBytes(render_surface->content_rect().size(),
RGBA_8888);
contents_texture_bytes += bytes;
if (render_surface_layer->background_filters().IsEmpty() &&
render_surface_layer->uses_default_blend_mode())
continue;
if (!readback_bytes) {
readback_bytes = Resource::MemorySizeBytes(device_viewport_size_,
RGBA_8888);
}
}
return readback_bytes + contents_texture_bytes;
}
void LayerTreeHost::PaintMasksForRenderSurface(Layer* render_surface_layer,
ResourceUpdateQueue* queue,
bool* did_paint_content,
bool* need_more_updates) {
// Note: Masks and replicas only exist for layers that own render surfaces. If
// we reach this point in code, we already know that at least something will
// be drawn into this render surface, so the mask and replica should be
// painted.
Layer* mask_layer = render_surface_layer->mask_layer();
if (mask_layer) {
*did_paint_content |= mask_layer->Update(queue, NULL);
*need_more_updates |= mask_layer->NeedMoreUpdates();
}
Layer* replica_mask_layer =
render_surface_layer->replica_layer() ?
render_surface_layer->replica_layer()->mask_layer() : NULL;
if (replica_mask_layer) {
*did_paint_content |= replica_mask_layer->Update(queue, NULL);
*need_more_updates |= replica_mask_layer->NeedMoreUpdates();
}
}
void LayerTreeHost::PaintLayerContents(
const RenderSurfaceLayerList& render_surface_layer_list,
ResourceUpdateQueue* queue,
bool* did_paint_content,
bool* need_more_updates) {
OcclusionTracker<Layer> occlusion_tracker(
root_layer_->render_surface()->content_rect());
occlusion_tracker.set_minimum_tracking_size(
settings_.minimum_occlusion_tracking_size);
PrioritizeTextures(render_surface_layer_list);
in_paint_layer_contents_ = true;
// Iterates front-to-back to allow for testing occlusion and performing
// culling during the tree walk.
typedef LayerIterator<Layer> LayerIteratorType;
LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
for (LayerIteratorType it =
LayerIteratorType::Begin(&render_surface_layer_list);
it != end;
++it) {
occlusion_tracker.EnterLayer(it);
if (it.represents_target_render_surface()) {
PaintMasksForRenderSurface(
*it, queue, did_paint_content, need_more_updates);
} else if (it.represents_itself()) {
DCHECK(!it->paint_properties().bounds.IsEmpty());
*did_paint_content |= it->Update(queue, &occlusion_tracker);
*need_more_updates |= it->NeedMoreUpdates();
// Note the '&&' with previous is-suitable state.
// This means that once the layer-tree becomes unsuitable for gpu
// rasterization due to some content, it will continue to be unsuitable
// even if that content is replaced by gpu-friendly content.
// This is to avoid switching back-and-forth between gpu and sw
// rasterization which may be both bad for performance and visually
// jarring.
content_is_suitable_for_gpu_rasterization_ &=
it->IsSuitableForGpuRasterization();
}
occlusion_tracker.LeaveLayer(it);
}
in_paint_layer_contents_ = false;
}
void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
ScopedPtrVector<SwapPromise>::iterator it = info->swap_promises.begin();
for (; it != info->swap_promises.end(); ++it) {
scoped_ptr<SwapPromise> swap_promise(info->swap_promises.take(it));
TRACE_EVENT_FLOW_STEP0("input",
"LatencyInfo.Flow",
TRACE_ID_DONT_MANGLE(swap_promise->TraceId()),
"Main thread scroll update");
QueueSwapPromise(swap_promise.Pass());
}
gfx::Vector2dF inner_viewport_scroll_delta;
gfx::Vector2dF outer_viewport_scroll_delta;
if (root_layer_.get()) {
for (size_t i = 0; i < info->scrolls.size(); ++i) {
Layer* layer = LayerTreeHostCommon::FindLayerInSubtree(
root_layer_.get(), info->scrolls[i].layer_id);
if (!layer)
continue;
if (layer == outer_viewport_scroll_layer_.get()) {
outer_viewport_scroll_delta += info->scrolls[i].scroll_delta;
} else if (layer == inner_viewport_scroll_layer_.get()) {
inner_viewport_scroll_delta += info->scrolls[i].scroll_delta;
} else {
layer->SetScrollOffsetFromImplSide(
gfx::ScrollOffsetWithDelta(layer->scroll_offset(),
info->scrolls[i].scroll_delta));
}
}
}
if (!inner_viewport_scroll_delta.IsZero() ||
!outer_viewport_scroll_delta.IsZero() || info->page_scale_delta != 1.f ||
!info->elastic_overscroll_delta.IsZero() || info->top_controls_delta) {
// Preemptively apply the scroll offset and scale delta here before sending
// it to the client. If the client comes back and sets it to the same
// value, then the layer can early out without needing a full commit.
if (inner_viewport_scroll_layer_.get()) {
inner_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
gfx::ScrollOffsetWithDelta(
inner_viewport_scroll_layer_->scroll_offset(),
inner_viewport_scroll_delta));
}
if (outer_viewport_scroll_layer_.get()) {
outer_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
gfx::ScrollOffsetWithDelta(
outer_viewport_scroll_layer_->scroll_offset(),
outer_viewport_scroll_delta));
}
ApplyPageScaleDeltaFromImplSide(info->page_scale_delta);
elastic_overscroll_ += info->elastic_overscroll_delta;
if (!settings_.use_pinch_virtual_viewport) {
// TODO(miletus): Make sure either this code path is totally gone,
// or revisit the flooring here if the old pinch viewport code path
// is causing problems with fractional scroll offset.
client_->ApplyViewportDeltas(
gfx::ToFlooredVector2d(inner_viewport_scroll_delta +
outer_viewport_scroll_delta),
info->page_scale_delta, info->top_controls_delta);
} else {
// TODO(ccameron): pass the elastic overscroll here so that input events
// may be translated appropriately.
client_->ApplyViewportDeltas(
inner_viewport_scroll_delta, outer_viewport_scroll_delta,
info->elastic_overscroll_delta, info->page_scale_delta,
info->top_controls_delta);
}
}
}
void LayerTreeHost::StartRateLimiter() {
if (inside_begin_main_frame_)
return;
if (!rate_limit_timer_.IsRunning()) {
rate_limit_timer_.Start(FROM_HERE,
base::TimeDelta(),
this,
&LayerTreeHost::RateLimit);
}
}
void LayerTreeHost::StopRateLimiter() {
rate_limit_timer_.Stop();
}
void LayerTreeHost::RateLimit() {
// Force a no-op command on the compositor context, so that any ratelimiting
// commands will wait for the compositing context, and therefore for the
// SwapBuffers.
proxy_->ForceSerializeOnSwapBuffers();
client_->RateLimitSharedMainThreadContext();
}
bool LayerTreeHost::AlwaysUsePartialTextureUpdates() {
if (!proxy_->GetRendererCapabilities().allow_partial_texture_updates)
return false;
return !proxy_->HasImplThread();
}
size_t LayerTreeHost::MaxPartialTextureUpdates() const {
size_t max_partial_texture_updates = 0;
if (proxy_->GetRendererCapabilities().allow_partial_texture_updates &&
!settings_.impl_side_painting) {
max_partial_texture_updates =
std::min(settings_.max_partial_texture_updates,
proxy_->MaxPartialTextureUpdates());
}
return max_partial_texture_updates;
}
bool LayerTreeHost::RequestPartialTextureUpdate() {
if (partial_texture_update_requests_ >= MaxPartialTextureUpdates())
return false;
partial_texture_update_requests_++;
return true;
}
void LayerTreeHost::SetDeviceScaleFactor(float device_scale_factor) {
if (device_scale_factor == device_scale_factor_)
return;
device_scale_factor_ = device_scale_factor;
SetNeedsCommit();
}
void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
TopControlsState current,
bool animate) {
if (!settings_.calculate_top_controls_position)
return;
// Top controls are only used in threaded mode.
proxy_->ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&TopControlsManager::UpdateTopControlsState,
top_controls_manager_weak_ptr_,
constraints,
current,
animate));
}
void LayerTreeHost::AsValueInto(base::trace_event::TracedValue* state) const {
state->BeginDictionary("proxy");
proxy_->AsValueInto(state);
state->EndDictionary();
}
void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
if (!settings_.accelerated_animation_enabled ||
animation_registrar_->active_animation_controllers().empty())
return;
TRACE_EVENT0("cc", "LayerTreeHost::AnimateLayers");
AnimationRegistrar::AnimationControllerMap copy =
animation_registrar_->active_animation_controllers();
for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin();
iter != copy.end();
++iter) {
(*iter).second->Animate(monotonic_time);
bool start_ready_animations = true;
(*iter).second->UpdateState(start_ready_animations, NULL);
}
}
UIResourceId LayerTreeHost::CreateUIResource(UIResourceClient* client) {
DCHECK(client);
UIResourceId next_id = next_ui_resource_id_++;
DCHECK(ui_resource_client_map_.find(next_id) ==
ui_resource_client_map_.end());
bool resource_lost = false;
UIResourceRequest request(UIResourceRequest::UIResourceCreate,
next_id,
client->GetBitmap(next_id, resource_lost));
ui_resource_request_queue_.push_back(request);
UIResourceClientData data;
data.client = client;
data.size = request.GetBitmap().GetSize();
ui_resource_client_map_[request.GetId()] = data;
return request.GetId();
}
// Deletes a UI resource. May safely be called more than once.
void LayerTreeHost::DeleteUIResource(UIResourceId uid) {
UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
if (iter == ui_resource_client_map_.end())
return;
UIResourceRequest request(UIResourceRequest::UIResourceDelete, uid);
ui_resource_request_queue_.push_back(request);
ui_resource_client_map_.erase(iter);
}
void LayerTreeHost::RecreateUIResources() {
for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
iter != ui_resource_client_map_.end();
++iter) {
UIResourceId uid = iter->first;
const UIResourceClientData& data = iter->second;
bool resource_lost = true;
UIResourceRequest request(UIResourceRequest::UIResourceCreate,
uid,
data.client->GetBitmap(uid, resource_lost));
ui_resource_request_queue_.push_back(request);
}
}
// Returns the size of a resource given its id.
gfx::Size LayerTreeHost::GetUIResourceSize(UIResourceId uid) const {
UIResourceClientMap::const_iterator iter = ui_resource_client_map_.find(uid);
if (iter == ui_resource_client_map_.end())
return gfx::Size();
const UIResourceClientData& data = iter->second;
return data.size;
}
void LayerTreeHost::RegisterViewportLayers(
scoped_refptr<Layer> overscroll_elasticity_layer,
scoped_refptr<Layer> page_scale_layer,
scoped_refptr<Layer> inner_viewport_scroll_layer,
scoped_refptr<Layer> outer_viewport_scroll_layer) {
overscroll_elasticity_layer_ = overscroll_elasticity_layer;
page_scale_layer_ = page_scale_layer;
inner_viewport_scroll_layer_ = inner_viewport_scroll_layer;
outer_viewport_scroll_layer_ = outer_viewport_scroll_layer;
}
void LayerTreeHost::RegisterSelection(const LayerSelectionBound& start,
const LayerSelectionBound& end) {
if (selection_start_ == start && selection_end_ == end)
return;
selection_start_ = start;
selection_end_ = end;
SetNeedsCommit();
}
int LayerTreeHost::ScheduleMicroBenchmark(
const std::string& benchmark_name,
scoped_ptr<base::Value> value,
const MicroBenchmark::DoneCallback& callback) {
return micro_benchmark_controller_.ScheduleRun(
benchmark_name, value.Pass(), callback);
}
bool LayerTreeHost::SendMessageToMicroBenchmark(int id,
scoped_ptr<base::Value> value) {
return micro_benchmark_controller_.SendMessage(id, value.Pass());
}
void LayerTreeHost::InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
swap_promise_monitor_.insert(monitor);
}
void LayerTreeHost::RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
swap_promise_monitor_.erase(monitor);
}
void LayerTreeHost::NotifySwapPromiseMonitorsOfSetNeedsCommit() {
std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
for (; it != swap_promise_monitor_.end(); it++)
(*it)->OnSetNeedsCommitOnMain();
}
void LayerTreeHost::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
DCHECK(swap_promise);
swap_promise_list_.push_back(swap_promise.Pass());
}
void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
for (size_t i = 0; i < swap_promise_list_.size(); i++)
swap_promise_list_[i]->DidNotSwap(reason);
swap_promise_list_.clear();
}
void LayerTreeHost::set_surface_id_namespace(uint32_t id_namespace) {
surface_id_namespace_ = id_namespace;
}
SurfaceSequence LayerTreeHost::CreateSurfaceSequence() {
return SurfaceSequence(surface_id_namespace_, next_surface_sequence_++);
}
void LayerTreeHost::SetChildrenNeedBeginFrames(
bool children_need_begin_frames) const {
proxy_->SetChildrenNeedBeginFrames(children_need_begin_frames);
}
void LayerTreeHost::SendBeginFramesToChildren(
const BeginFrameArgs& args) const {
client_->SendBeginFramesToChildren(args);
}
} // namespace cc