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thread_proxy.cc
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// 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/thread_proxy.h"
#include <string>
#include "base/auto_reset.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/metrics/histogram.h"
#include "cc/input/input_handler.h"
#include "cc/output/context_provider.h"
#include "cc/output/output_surface.h"
#include "cc/quads/draw_quad.h"
#include "cc/resources/prioritized_resource_manager.h"
#include "cc/scheduler/delay_based_time_source.h"
#include "cc/scheduler/frame_rate_controller.h"
#include "cc/scheduler/scheduler.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_impl.h"
namespace {
// Measured in seconds.
const double kContextRecreationTickRate = 0.03;
// Measured in seconds.
const double kSmoothnessTakesPriorityExpirationDelay = 0.25;
const size_t kDrawDurationHistorySize = 60;
const double kDrawDurationEstimationPercentile = 100.0;
const int kDrawDurationEstimatePaddingInMicroseconds = 0;
} // namespace
namespace cc {
struct ThreadProxy::ReadbackRequest {
CompletionEvent completion;
bool success;
void* pixels;
gfx::Rect rect;
};
struct ThreadProxy::CommitPendingRequest {
CompletionEvent completion;
bool commit_pending;
};
struct ThreadProxy::SchedulerStateRequest {
CompletionEvent completion;
std::string state;
};
scoped_ptr<Proxy> ThreadProxy::Create(
LayerTreeHost* layer_tree_host,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
return make_scoped_ptr(
new ThreadProxy(layer_tree_host, impl_task_runner)).PassAs<Proxy>();
}
ThreadProxy::ThreadProxy(
LayerTreeHost* layer_tree_host,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
: Proxy(impl_task_runner),
animate_requested_(false),
commit_requested_(false),
commit_request_sent_to_impl_thread_(false),
created_offscreen_context_provider_(false),
layer_tree_host_(layer_tree_host),
started_(false),
textures_acquired_(true),
in_composite_and_readback_(false),
manage_tiles_pending_(false),
weak_factory_on_impl_thread_(this),
weak_factory_(this),
begin_frame_sent_to_main_thread_completion_event_on_impl_thread_(NULL),
readback_request_on_impl_thread_(NULL),
commit_completion_event_on_impl_thread_(NULL),
completion_event_for_commit_held_on_tree_activation_(NULL),
texture_acquisition_completion_event_on_impl_thread_(NULL),
next_frame_is_newly_committed_frame_on_impl_thread_(false),
throttle_frame_production_(
layer_tree_host->settings().throttle_frame_production),
begin_frame_scheduling_enabled_(
layer_tree_host->settings().begin_frame_scheduling_enabled),
using_synchronous_renderer_compositor_(
layer_tree_host->settings().using_synchronous_renderer_compositor),
inside_draw_(false),
defer_commits_(false),
renew_tree_priority_on_impl_thread_pending_(false),
draw_duration_history_(kDrawDurationHistorySize) {
TRACE_EVENT0("cc", "ThreadProxy::ThreadProxy");
DCHECK(IsMainThread());
DCHECK(layer_tree_host_);
}
ThreadProxy::~ThreadProxy() {
TRACE_EVENT0("cc", "ThreadProxy::~ThreadProxy");
DCHECK(IsMainThread());
DCHECK(!started_);
}
bool ThreadProxy::CompositeAndReadback(void* pixels, gfx::Rect rect) {
TRACE_EVENT0("cc", "ThreadProxy::CompositeAndReadback");
DCHECK(IsMainThread());
DCHECK(layer_tree_host_);
DCHECK(!defer_commits_);
if (!layer_tree_host_->InitializeOutputSurfaceIfNeeded()) {
TRACE_EVENT0("cc", "CompositeAndReadback_EarlyOut_LR_Uninitialized");
return false;
}
// Perform a synchronous commit.
{
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent begin_frame_sent_to_main_thread_completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::ForceCommitOnImplThread,
impl_thread_weak_ptr_,
&begin_frame_sent_to_main_thread_completion));
begin_frame_sent_to_main_thread_completion.Wait();
}
in_composite_and_readback_ = true;
BeginFrameOnMainThread(scoped_ptr<BeginFrameAndCommitState>());
in_composite_and_readback_ = false;
// Perform a synchronous readback.
ReadbackRequest request;
request.rect = rect;
request.pixels = pixels;
{
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::RequestReadbackOnImplThread,
impl_thread_weak_ptr_,
&request));
request.completion.Wait();
}
return request.success;
}
void ThreadProxy::ForceCommitOnImplThread(CompletionEvent* completion) {
TRACE_EVENT0("cc", "ThreadProxy::ForceCommitOnImplThread");
DCHECK(IsImplThread());
DCHECK(!begin_frame_sent_to_main_thread_completion_event_on_impl_thread_);
scheduler_on_impl_thread_->SetNeedsForcedCommit();
if (scheduler_on_impl_thread_->CommitPending()) {
completion->Signal();
return;
}
begin_frame_sent_to_main_thread_completion_event_on_impl_thread_ = completion;
}
void ThreadProxy::RequestReadbackOnImplThread(ReadbackRequest* request) {
DCHECK(Proxy::IsImplThread());
DCHECK(!readback_request_on_impl_thread_);
if (!layer_tree_host_impl_) {
request->success = false;
request->completion.Signal();
return;
}
readback_request_on_impl_thread_ = request;
scheduler_on_impl_thread_->SetNeedsRedraw();
scheduler_on_impl_thread_->SetNeedsForcedRedraw();
}
void ThreadProxy::FinishAllRendering() {
DCHECK(Proxy::IsMainThread());
DCHECK(!defer_commits_);
// Make sure all GL drawing is finished on the impl thread.
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::FinishAllRenderingOnImplThread,
impl_thread_weak_ptr_,
&completion));
completion.Wait();
}
bool ThreadProxy::IsStarted() const {
DCHECK(Proxy::IsMainThread());
return started_;
}
void ThreadProxy::SetLayerTreeHostClientReady() {
TRACE_EVENT0("cc", "ThreadProxy::SetLayerTreeHostClientReady");
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetLayerTreeHostClientReadyOnImplThread,
impl_thread_weak_ptr_));
}
void ThreadProxy::SetLayerTreeHostClientReadyOnImplThread() {
TRACE_EVENT0("cc", "ThreadProxy::SetLayerTreeHostClientReadyOnImplThread");
scheduler_on_impl_thread_->SetCanStart();
}
void ThreadProxy::SetVisible(bool visible) {
TRACE_EVENT0("cc", "ThreadProxy::SetVisible");
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetVisibleOnImplThread,
impl_thread_weak_ptr_,
&completion,
visible));
completion.Wait();
}
void ThreadProxy::SetVisibleOnImplThread(CompletionEvent* completion,
bool visible) {
TRACE_EVENT0("cc", "ThreadProxy::SetVisibleOnImplThread");
layer_tree_host_impl_->SetVisible(visible);
scheduler_on_impl_thread_->SetVisible(visible);
completion->Signal();
}
void ThreadProxy::DoCreateAndInitializeOutputSurface() {
TRACE_EVENT0("cc", "ThreadProxy::DoCreateAndInitializeOutputSurface");
DCHECK(IsMainThread());
scoped_ptr<OutputSurface> output_surface = first_output_surface_.Pass();
if (!output_surface)
output_surface = layer_tree_host_->CreateOutputSurface();
RendererCapabilities capabilities;
bool success = !!output_surface;
if (!success) {
OnOutputSurfaceInitializeAttempted(false, capabilities);
return;
}
scoped_refptr<ContextProvider> offscreen_context_provider;
if (created_offscreen_context_provider_) {
offscreen_context_provider = layer_tree_host_->client()->
OffscreenContextProviderForCompositorThread();
success = !!offscreen_context_provider.get();
if (!success) {
OnOutputSurfaceInitializeAttempted(false, capabilities);
return;
}
}
success = false;
{
// Make a blocking call to InitializeOutputSurfaceOnImplThread. The results
// of that call are pushed into the success and capabilities local
// variables.
CompletionEvent completion;
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::InitializeOutputSurfaceOnImplThread,
impl_thread_weak_ptr_,
&completion,
base::Passed(&output_surface),
offscreen_context_provider,
&success,
&capabilities));
completion.Wait();
}
OnOutputSurfaceInitializeAttempted(success, capabilities);
}
void ThreadProxy::OnOutputSurfaceInitializeAttempted(
bool success,
const RendererCapabilities& capabilities) {
DCHECK(IsMainThread());
DCHECK(layer_tree_host_);
if (success) {
renderer_capabilities_main_thread_copy_ = capabilities;
}
LayerTreeHost::CreateResult result =
layer_tree_host_->OnCreateAndInitializeOutputSurfaceAttempted(success);
if (result == LayerTreeHost::CreateFailedButTryAgain) {
if (!output_surface_creation_callback_.callback().is_null()) {
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE, output_surface_creation_callback_.callback());
}
} else {
output_surface_creation_callback_.Cancel();
}
}
const RendererCapabilities& ThreadProxy::GetRendererCapabilities() const {
DCHECK(IsMainThread());
DCHECK(!layer_tree_host_->output_surface_lost());
return renderer_capabilities_main_thread_copy_;
}
void ThreadProxy::SetNeedsAnimate() {
DCHECK(IsMainThread());
if (animate_requested_)
return;
TRACE_EVENT0("cc", "ThreadProxy::SetNeedsAnimate");
animate_requested_ = true;
if (commit_request_sent_to_impl_thread_)
return;
commit_request_sent_to_impl_thread_ = true;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetNeedsCommitOnImplThread,
impl_thread_weak_ptr_));
}
void ThreadProxy::SetNeedsCommit() {
DCHECK(IsMainThread());
if (commit_requested_)
return;
TRACE_EVENT0("cc", "ThreadProxy::SetNeedsCommit");
commit_requested_ = true;
if (commit_request_sent_to_impl_thread_)
return;
commit_request_sent_to_impl_thread_ = true;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetNeedsCommitOnImplThread,
impl_thread_weak_ptr_));
}
void ThreadProxy::DidLoseOutputSurfaceOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::DidLoseOutputSurfaceOnImplThread");
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::CheckOutputSurfaceStatusOnImplThread,
impl_thread_weak_ptr_));
}
void ThreadProxy::CheckOutputSurfaceStatusOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::CheckOutputSurfaceStatusOnImplThread");
if (!layer_tree_host_impl_->IsContextLost())
return;
if (cc::ContextProvider* offscreen_contexts = layer_tree_host_impl_
->resource_provider()->offscreen_context_provider())
offscreen_contexts->VerifyContexts();
scheduler_on_impl_thread_->DidLoseOutputSurface();
}
void ThreadProxy::OnSwapBuffersCompleteOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::OnSwapBuffersCompleteOnImplThread");
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::DidCompleteSwapBuffers, main_thread_weak_ptr_));
}
void ThreadProxy::SetNeedsBeginFrameOnImplThread(bool enable) {
DCHECK(IsImplThread());
TRACE_EVENT1("cc", "ThreadProxy::SetNeedsBeginFrameOnImplThread",
"enable", enable);
layer_tree_host_impl_->SetNeedsBeginFrame(enable);
}
void ThreadProxy::BeginFrameOnImplThread(const BeginFrameArgs& args) {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnImplThread");
scheduler_on_impl_thread_->BeginFrame(args);
}
void ThreadProxy::OnCanDrawStateChanged(bool can_draw) {
DCHECK(IsImplThread());
TRACE_EVENT1(
"cc", "ThreadProxy::OnCanDrawStateChanged", "can_draw", can_draw);
scheduler_on_impl_thread_->SetCanDraw(can_draw);
layer_tree_host_impl_->UpdateBackgroundAnimateTicking(
!scheduler_on_impl_thread_->WillDrawIfNeeded());
}
void ThreadProxy::OnHasPendingTreeStateChanged(bool has_pending_tree) {
DCHECK(IsImplThread());
TRACE_EVENT1("cc", "ThreadProxy::OnHasPendingTreeStateChanged",
"has_pending_tree", has_pending_tree);
scheduler_on_impl_thread_->SetHasPendingTree(has_pending_tree);
}
void ThreadProxy::SetNeedsCommitOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::SetNeedsCommitOnImplThread");
scheduler_on_impl_thread_->SetNeedsCommit();
}
void ThreadProxy::PostAnimationEventsToMainThreadOnImplThread(
scoped_ptr<AnimationEventsVector> events,
base::Time wall_clock_time) {
DCHECK(IsImplThread());
TRACE_EVENT0("cc",
"ThreadProxy::PostAnimationEventsToMainThreadOnImplThread");
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetAnimationEvents,
main_thread_weak_ptr_,
base::Passed(&events),
wall_clock_time));
}
bool ThreadProxy::ReduceContentsTextureMemoryOnImplThread(size_t limit_bytes,
int priority_cutoff) {
DCHECK(IsImplThread());
if (!layer_tree_host_->contents_texture_manager())
return false;
bool reduce_result = layer_tree_host_->contents_texture_manager()->
ReduceMemoryOnImplThread(limit_bytes,
priority_cutoff,
layer_tree_host_impl_->resource_provider());
if (!reduce_result)
return false;
// The texture upload queue may reference textures that were just purged,
// clear them from the queue.
if (current_resource_update_controller_on_impl_thread_) {
current_resource_update_controller_on_impl_thread_->
DiscardUploadsToEvictedResources();
}
return true;
}
void ThreadProxy::ReduceWastedContentsTextureMemoryOnImplThread() {
DCHECK(IsImplThread());
if (!layer_tree_host_->contents_texture_manager())
return;
layer_tree_host_->contents_texture_manager()->ReduceWastedMemoryOnImplThread(
layer_tree_host_impl_->resource_provider());
}
void ThreadProxy::SendManagedMemoryStats() {
DCHECK(IsImplThread());
if (!layer_tree_host_impl_)
return;
if (!layer_tree_host_->contents_texture_manager())
return;
// If we are using impl-side painting, then SendManagedMemoryStats is called
// directly after the tile manager's manage function, and doesn't need to
// interact with main thread's layer tree.
if (layer_tree_host_->settings().impl_side_painting)
return;
layer_tree_host_impl_->SendManagedMemoryStats(
layer_tree_host_->contents_texture_manager()->MemoryVisibleBytes(),
layer_tree_host_->contents_texture_manager()->
MemoryVisibleAndNearbyBytes(),
layer_tree_host_->contents_texture_manager()->MemoryUseBytes());
}
bool ThreadProxy::IsInsideDraw() { return inside_draw_; }
void ThreadProxy::SetNeedsRedraw(gfx::Rect damage_rect) {
DCHECK(IsMainThread());
TRACE_EVENT0("cc", "ThreadProxy::SetNeedsRedraw");
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::SetNeedsRedrawRectOnImplThread,
impl_thread_weak_ptr_,
damage_rect));
}
void ThreadProxy::SetDeferCommits(bool defer_commits) {
DCHECK(IsMainThread());
DCHECK_NE(defer_commits_, defer_commits);
defer_commits_ = defer_commits;
if (defer_commits_)
TRACE_EVENT_ASYNC_BEGIN0("cc", "ThreadProxy::SetDeferCommits", this);
else
TRACE_EVENT_ASYNC_END0("cc", "ThreadProxy::SetDeferCommits", this);
if (!defer_commits_ && pending_deferred_commit_)
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::BeginFrameOnMainThread,
main_thread_weak_ptr_,
base::Passed(&pending_deferred_commit_)));
}
bool ThreadProxy::CommitRequested() const {
DCHECK(IsMainThread());
return commit_requested_;
}
void ThreadProxy::SetNeedsRedrawOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::SetNeedsRedrawOnImplThread");
scheduler_on_impl_thread_->SetNeedsRedraw();
}
void ThreadProxy::SetNeedsRedrawRectOnImplThread(gfx::Rect damage_rect) {
DCHECK(IsImplThread());
layer_tree_host_impl_->SetViewportDamage(damage_rect);
SetNeedsRedrawOnImplThread();
}
void ThreadProxy::DidSwapUseIncompleteTileOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::DidSwapUseIncompleteTileOnImplThread");
scheduler_on_impl_thread_->DidSwapUseIncompleteTile();
}
void ThreadProxy::DidInitializeVisibleTileOnImplThread() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::DidInitializeVisibleTileOnImplThread");
scheduler_on_impl_thread_->SetNeedsRedraw();
}
void ThreadProxy::MainThreadHasStoppedFlinging() {
DCHECK(IsMainThread());
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::MainThreadHasStoppedFlingingOnImplThread,
impl_thread_weak_ptr_));
}
void ThreadProxy::MainThreadHasStoppedFlingingOnImplThread() {
DCHECK(IsImplThread());
layer_tree_host_impl_->MainThreadHasStoppedFlinging();
}
void ThreadProxy::Start(scoped_ptr<OutputSurface> first_output_surface) {
DCHECK(IsMainThread());
DCHECK(Proxy::HasImplThread());
DCHECK(first_output_surface);
// Create LayerTreeHostImpl.
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::InitializeImplOnImplThread,
base::Unretained(this),
&completion));
completion.Wait();
main_thread_weak_ptr_ = weak_factory_.GetWeakPtr();
first_output_surface_ = first_output_surface.Pass();
started_ = true;
}
void ThreadProxy::Stop() {
TRACE_EVENT0("cc", "ThreadProxy::Stop");
DCHECK(IsMainThread());
DCHECK(started_);
// Synchronously finishes pending GL operations and deletes the impl.
// The two steps are done as separate post tasks, so that tasks posted
// by the GL implementation due to the Finish can be executed by the
// renderer before shutting it down.
{
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::FinishGLOnImplThread,
impl_thread_weak_ptr_,
&completion));
completion.Wait();
}
{
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::LayerTreeHostClosedOnImplThread,
impl_thread_weak_ptr_,
&completion));
completion.Wait();
}
weak_factory_.InvalidateWeakPtrs();
DCHECK(!layer_tree_host_impl_.get()); // verify that the impl deleted.
layer_tree_host_ = NULL;
started_ = false;
}
void ThreadProxy::ForceSerializeOnSwapBuffers() {
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::ForceSerializeOnSwapBuffersOnImplThread,
impl_thread_weak_ptr_,
&completion));
completion.Wait();
}
void ThreadProxy::ForceSerializeOnSwapBuffersOnImplThread(
CompletionEvent* completion) {
if (layer_tree_host_impl_->renderer())
layer_tree_host_impl_->renderer()->DoNoOp();
completion->Signal();
}
void ThreadProxy::FinishAllRenderingOnImplThread(CompletionEvent* completion) {
TRACE_EVENT0("cc", "ThreadProxy::FinishAllRenderingOnImplThread");
DCHECK(IsImplThread());
layer_tree_host_impl_->FinishAllRendering();
completion->Signal();
}
void ThreadProxy::ScheduledActionSendBeginFrameToMainThread() {
TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionSendBeginFrameToMainThread");
scoped_ptr<BeginFrameAndCommitState> begin_frame_state(
new BeginFrameAndCommitState);
begin_frame_state->monotonic_frame_begin_time =
layer_tree_host_impl_->CurrentPhysicalTimeTicks();
begin_frame_state->scroll_info =
layer_tree_host_impl_->ProcessScrollDeltas();
if (!layer_tree_host_impl_->settings().impl_side_painting) {
DCHECK_GT(layer_tree_host_impl_->memory_allocation_limit_bytes(), 0u);
}
begin_frame_state->memory_allocation_limit_bytes =
layer_tree_host_impl_->memory_allocation_limit_bytes();
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::BeginFrameOnMainThread,
main_thread_weak_ptr_,
base::Passed(&begin_frame_state)));
if (begin_frame_sent_to_main_thread_completion_event_on_impl_thread_) {
begin_frame_sent_to_main_thread_completion_event_on_impl_thread_->Signal();
begin_frame_sent_to_main_thread_completion_event_on_impl_thread_ = NULL;
}
}
void ThreadProxy::BeginFrameOnMainThread(
scoped_ptr<BeginFrameAndCommitState> begin_frame_state) {
TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnMainThread");
DCHECK(IsMainThread());
if (!layer_tree_host_)
return;
if (defer_commits_) {
pending_deferred_commit_ = begin_frame_state.Pass();
layer_tree_host_->DidDeferCommit();
TRACE_EVENT0("cc", "EarlyOut_DeferCommits");
return;
}
// Do not notify the impl thread of commit requests that occur during
// the apply/animate/layout part of the BeginFrameAndCommit process since
// those commit requests will get painted immediately. Once we have done
// the paint, commit_requested_ will be set to false to allow new commit
// requests to be scheduled.
commit_requested_ = true;
commit_request_sent_to_impl_thread_ = true;
// On the other hand, the AnimationRequested flag needs to be cleared
// here so that any animation requests generated by the apply or animate
// callbacks will trigger another frame.
animate_requested_ = false;
if (begin_frame_state)
layer_tree_host_->ApplyScrollAndScale(*begin_frame_state->scroll_info);
if (!in_composite_and_readback_ && !layer_tree_host_->visible()) {
commit_requested_ = false;
commit_request_sent_to_impl_thread_ = false;
TRACE_EVENT0("cc", "EarlyOut_NotVisible");
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::BeginFrameAbortedByMainThreadOnImplThread,
impl_thread_weak_ptr_));
return;
}
layer_tree_host_->WillBeginFrame();
if (begin_frame_state) {
layer_tree_host_->UpdateClientAnimations(
begin_frame_state->monotonic_frame_begin_time);
layer_tree_host_->AnimateLayers(
begin_frame_state->monotonic_frame_begin_time);
}
// Unlink any backings that the impl thread has evicted, so that we know to
// re-paint them in UpdateLayers.
if (layer_tree_host_->contents_texture_manager()) {
layer_tree_host_->contents_texture_manager()->
UnlinkAndClearEvictedBackings();
}
layer_tree_host_->Layout();
// Clear the commit flag after updating animations and layout here --- objects
// that only layout when painted will trigger another SetNeedsCommit inside
// UpdateLayers.
commit_requested_ = false;
commit_request_sent_to_impl_thread_ = false;
scoped_ptr<ResourceUpdateQueue> queue =
make_scoped_ptr(new ResourceUpdateQueue);
layer_tree_host_->UpdateLayers(
queue.get(),
begin_frame_state ?
begin_frame_state->memory_allocation_limit_bytes : 0u);
// Once single buffered layers are committed, they cannot be modified until
// they are drawn by the impl thread.
textures_acquired_ = false;
layer_tree_host_->WillCommit();
// Before applying scrolls and calling animate, we set animate_requested_ to
// false. If it is true now, it means SetNeedAnimate was called again, but
// during a state when commit_request_sent_to_impl_thread_ = true. We need to
// force that call to happen again now so that the commit request is sent to
// the impl thread.
if (animate_requested_) {
// Forces SetNeedsAnimate to consider posting a commit task.
animate_requested_ = false;
SetNeedsAnimate();
}
scoped_refptr<cc::ContextProvider> offscreen_context_provider;
if (renderer_capabilities_main_thread_copy_.using_offscreen_context3d &&
layer_tree_host_->needs_offscreen_context()) {
offscreen_context_provider = layer_tree_host_->client()->
OffscreenContextProviderForCompositorThread();
if (offscreen_context_provider.get())
created_offscreen_context_provider_ = true;
}
// Notify the impl thread that the main thread is ready to commit. This will
// begin the commit process, which is blocking from the main thread's
// point of view, but asynchronously performed on the impl thread,
// coordinated by the Scheduler.
{
TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnMainThread::commit");
DebugScopedSetMainThreadBlocked main_thread_blocked(this);
RenderingStatsInstrumentation* stats_instrumentation =
layer_tree_host_->rendering_stats_instrumentation();
base::TimeTicks start_time = stats_instrumentation->StartRecording();
CompletionEvent completion;
Proxy::ImplThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::StartCommitOnImplThread,
impl_thread_weak_ptr_,
&completion,
queue.release(),
offscreen_context_provider));
completion.Wait();
base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);
stats_instrumentation->AddCommit(duration);
}
layer_tree_host_->CommitComplete();
layer_tree_host_->DidBeginFrame();
}
void ThreadProxy::StartCommitOnImplThread(
CompletionEvent* completion,
ResourceUpdateQueue* raw_queue,
scoped_refptr<cc::ContextProvider> offscreen_context_provider) {
scoped_ptr<ResourceUpdateQueue> queue(raw_queue);
TRACE_EVENT0("cc", "ThreadProxy::StartCommitOnImplThread");
DCHECK(!commit_completion_event_on_impl_thread_);
DCHECK(IsImplThread() && IsMainThreadBlocked());
DCHECK(scheduler_on_impl_thread_);
DCHECK(scheduler_on_impl_thread_->CommitPending());
if (!layer_tree_host_impl_) {
TRACE_EVENT0("cc", "EarlyOut_NoLayerTree");
completion->Signal();
return;
}
if (offscreen_context_provider.get())
offscreen_context_provider->BindToCurrentThread();
layer_tree_host_impl_->resource_provider()->
set_offscreen_context_provider(offscreen_context_provider);
if (layer_tree_host_->contents_texture_manager()) {
if (layer_tree_host_->contents_texture_manager()->
LinkedEvictedBackingsExist()) {
// Clear any uploads we were making to textures linked to evicted
// resources
queue->ClearUploadsToEvictedResources();
// Some textures in the layer tree are invalid. Kick off another commit
// to fill them again.
SetNeedsCommitOnImplThread();
}
layer_tree_host_->contents_texture_manager()->
PushTexturePrioritiesToBackings();
}
commit_completion_event_on_impl_thread_ = completion;
current_resource_update_controller_on_impl_thread_ =
ResourceUpdateController::Create(
this,
Proxy::ImplThreadTaskRunner(),
queue.Pass(),
layer_tree_host_impl_->resource_provider());
current_resource_update_controller_on_impl_thread_->PerformMoreUpdates(
scheduler_on_impl_thread_->AnticipatedDrawTime());
}
void ThreadProxy::BeginFrameAbortedByMainThreadOnImplThread() {
TRACE_EVENT0("cc", "ThreadProxy::BeginFrameAbortedByMainThreadOnImplThread");
DCHECK(IsImplThread());
DCHECK(scheduler_on_impl_thread_);
DCHECK(scheduler_on_impl_thread_->CommitPending());
scheduler_on_impl_thread_->BeginFrameAbortedByMainThread();
}
void ThreadProxy::ScheduledActionCommit() {
TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionCommit");
DCHECK(IsImplThread());
DCHECK(commit_completion_event_on_impl_thread_);
DCHECK(current_resource_update_controller_on_impl_thread_);
// Complete all remaining texture updates.
current_resource_update_controller_on_impl_thread_->Finalize();
current_resource_update_controller_on_impl_thread_.reset();
layer_tree_host_impl_->BeginCommit();
layer_tree_host_->BeginCommitOnImplThread(layer_tree_host_impl_.get());
layer_tree_host_->FinishCommitOnImplThread(layer_tree_host_impl_.get());
layer_tree_host_impl_->CommitComplete();
layer_tree_host_impl_->UpdateBackgroundAnimateTicking(
!scheduler_on_impl_thread_->WillDrawIfNeeded());
next_frame_is_newly_committed_frame_on_impl_thread_ = true;
if (layer_tree_host_->settings().impl_side_painting &&
layer_tree_host_->BlocksPendingCommit() &&
layer_tree_host_impl_->pending_tree()) {
// For some layer types in impl-side painting, the commit is held until
// the pending tree is activated. It's also possible that the
// pending tree has already activated if there was no work to be done.
TRACE_EVENT_INSTANT0("cc", "HoldCommit", TRACE_EVENT_SCOPE_THREAD);
completion_event_for_commit_held_on_tree_activation_ =
commit_completion_event_on_impl_thread_;
commit_completion_event_on_impl_thread_ = NULL;
} else {
commit_completion_event_on_impl_thread_->Signal();
commit_completion_event_on_impl_thread_ = NULL;
}
// SetVisible kicks off the next scheduler action, so this must be last.
scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
}
void ThreadProxy::ScheduledActionCheckForCompletedTileUploads() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc",
"ThreadProxy::ScheduledActionCheckForCompletedTileUploads");
layer_tree_host_impl_->CheckForCompletedTileUploads();
}
void ThreadProxy::ScheduledActionActivatePendingTreeIfNeeded() {
DCHECK(IsImplThread());
TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionActivatePendingTreeIfNeeded");
layer_tree_host_impl_->ActivatePendingTreeIfNeeded();
}
void ThreadProxy::ScheduledActionBeginOutputSurfaceCreation() {
DCHECK(IsImplThread());
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::CreateAndInitializeOutputSurface,
main_thread_weak_ptr_));
}
ScheduledActionDrawAndSwapResult
ThreadProxy::ScheduledActionDrawAndSwapInternal(bool forced_draw) {
TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionDrawAndSwap");
ScheduledActionDrawAndSwapResult result;
result.did_draw = false;
result.did_swap = false;
DCHECK(IsImplThread());
DCHECK(layer_tree_host_impl_.get());
if (!layer_tree_host_impl_)
return result;
DCHECK(layer_tree_host_impl_->renderer());
if (!layer_tree_host_impl_->renderer())
return result;
base::TimeTicks monotonic_time =
layer_tree_host_impl_->CurrentFrameTimeTicks();
base::Time wall_clock_time = layer_tree_host_impl_->CurrentFrameTime();
// TODO(enne): This should probably happen post-animate.
if (layer_tree_host_impl_->pending_tree()) {
layer_tree_host_impl_->ActivatePendingTreeIfNeeded();
if (layer_tree_host_impl_->pending_tree())
layer_tree_host_impl_->pending_tree()->UpdateDrawProperties();
}
layer_tree_host_impl_->Animate(monotonic_time, wall_clock_time);
layer_tree_host_impl_->UpdateBackgroundAnimateTicking(false);
base::TimeTicks start_time = base::TimeTicks::HighResNow();
base::TimeDelta draw_duration_estimate = DrawDurationEstimate();
base::AutoReset<bool> mark_inside(&inside_draw_, true);
// This method is called on a forced draw, regardless of whether we are able
// to produce a frame, as the calling site on main thread is blocked until its
// request completes, and we signal completion here. If CanDraw() is false, we
// will indicate success=false to the caller, but we must still signal
// completion to avoid deadlock.
// We guard PrepareToDraw() with CanDraw() because it always returns a valid
// frame, so can only be used when such a frame is possible. Since
// DrawLayers() depends on the result of PrepareToDraw(), it is guarded on
// CanDraw() as well.
bool drawing_for_readback = !!readback_request_on_impl_thread_;
bool can_do_readback = layer_tree_host_impl_->renderer()->CanReadPixels();
LayerTreeHostImpl::FrameData frame;
bool draw_frame = false;
bool start_ready_animations = true;
if (layer_tree_host_impl_->CanDraw() &&
(!drawing_for_readback || can_do_readback)) {
// If it is for a readback, make sure we draw the portion being read back.
gfx::Rect readback_rect;
if (drawing_for_readback)
readback_rect = readback_request_on_impl_thread_->rect;
// Do not start animations if we skip drawing the frame to avoid
// checkerboarding.
if (layer_tree_host_impl_->PrepareToDraw(&frame, readback_rect) ||
forced_draw)
draw_frame = true;
else
start_ready_animations = false;
}
if (draw_frame) {
layer_tree_host_impl_->DrawLayers(
&frame,
scheduler_on_impl_thread_->LastBeginFrameOnImplThreadTime());
result.did_draw = true;
}
layer_tree_host_impl_->DidDrawAllLayers(frame);
layer_tree_host_impl_->UpdateAnimationState(start_ready_animations);
// Check for a pending CompositeAndReadback.
if (readback_request_on_impl_thread_) {
readback_request_on_impl_thread_->success = false;
if (draw_frame) {
layer_tree_host_impl_->Readback(readback_request_on_impl_thread_->pixels,
readback_request_on_impl_thread_->rect);
readback_request_on_impl_thread_->success =
!layer_tree_host_impl_->IsContextLost();
}
readback_request_on_impl_thread_->completion.Signal();
readback_request_on_impl_thread_ = NULL;
} else if (draw_frame) {
result.did_swap = layer_tree_host_impl_->SwapBuffers(frame);
if (frame.contains_incomplete_tile)
DidSwapUseIncompleteTileOnImplThread();
}
// Tell the main thread that the the newly-commited frame was drawn.
if (next_frame_is_newly_committed_frame_on_impl_thread_) {
next_frame_is_newly_committed_frame_on_impl_thread_ = false;
Proxy::MainThreadTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&ThreadProxy::DidCommitAndDrawFrame, main_thread_weak_ptr_));
}