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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/scheduler/frame_rate_controller.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "cc/scheduler/delay_based_time_source.h"
#include "cc/scheduler/time_source.h"
namespace cc {
class FrameRateControllerTimeSourceAdapter : public TimeSourceClient {
public:
static scoped_ptr<FrameRateControllerTimeSourceAdapter> Create(
FrameRateController* frame_rate_controller) {
return make_scoped_ptr(
new FrameRateControllerTimeSourceAdapter(frame_rate_controller));
}
virtual ~FrameRateControllerTimeSourceAdapter() {}
virtual void OnTimerTick() OVERRIDE {
frame_rate_controller_->OnTimerTick();
}
private:
explicit FrameRateControllerTimeSourceAdapter(
FrameRateController* frame_rate_controller)
: frame_rate_controller_(frame_rate_controller) {}
FrameRateController* frame_rate_controller_;
};
FrameRateController::FrameRateController(scoped_refptr<TimeSource> timer)
: client_(NULL),
num_frames_pending_(0),
max_swaps_pending_(0),
interval_(BeginFrameArgs::DefaultInterval()),
time_source_(timer),
active_(false),
is_time_source_throttling_(true),
weak_factory_(this),
task_runner_(NULL) {
time_source_client_adapter_ =
FrameRateControllerTimeSourceAdapter::Create(this);
time_source_->SetClient(time_source_client_adapter_.get());
}
FrameRateController::FrameRateController(
base::SingleThreadTaskRunner* task_runner)
: client_(NULL),
num_frames_pending_(0),
max_swaps_pending_(0),
interval_(BeginFrameArgs::DefaultInterval()),
active_(false),
is_time_source_throttling_(false),
weak_factory_(this),
task_runner_(task_runner) {}
FrameRateController::~FrameRateController() {
if (is_time_source_throttling_)
time_source_->SetActive(false);
}
BeginFrameArgs FrameRateController::SetActive(bool active) {
if (active_ == active)
return BeginFrameArgs();
TRACE_EVENT1("cc", "FrameRateController::SetActive", "active", active);
active_ = active;
if (is_time_source_throttling_) {
base::TimeTicks missed_tick_time = time_source_->SetActive(active);
if (!missed_tick_time.is_null()) {
base::TimeTicks deadline = NextTickTime();
return BeginFrameArgs::Create(missed_tick_time,
deadline,
interval_);
}
} else {
if (active)
PostManualTick();
else
weak_factory_.InvalidateWeakPtrs();
}
return BeginFrameArgs();
}
void FrameRateController::SetMaxSwapsPending(int max_swaps_pending) {
DCHECK_GE(max_swaps_pending, 0);
max_swaps_pending_ = max_swaps_pending;
}
void FrameRateController::SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval) {
interval_ = interval;
if (is_time_source_throttling_)
time_source_->SetTimebaseAndInterval(timebase, interval);
}
void FrameRateController::SetDeadlineAdjustment(base::TimeDelta delta) {
deadline_adjustment_ = delta;
}
void FrameRateController::OnTimerTick() {
TRACE_EVENT0("cc", "FrameRateController::OnTimerTick");
DCHECK(active_);
// Check if we have too many frames in flight.
bool throttled =
max_swaps_pending_ && num_frames_pending_ >= max_swaps_pending_;
TRACE_COUNTER_ID1("cc", "ThrottledCompositor", task_runner_, throttled);
if (client_) {
// TODO(brianderson): Use an adaptive parent compositor deadline.
base::TimeTicks frame_time = LastTickTime();
base::TimeTicks deadline = NextTickTime() + deadline_adjustment_;
client_->FrameRateControllerTick(
throttled,
BeginFrameArgs::Create(frame_time, deadline, interval_));
}
if (!is_time_source_throttling_ && !throttled)
PostManualTick();
}
void FrameRateController::PostManualTick() {
if (active_) {
task_runner_->PostTask(FROM_HERE,
base::Bind(&FrameRateController::ManualTick,
weak_factory_.GetWeakPtr()));
}
}
void FrameRateController::ManualTick() {
OnTimerTick();
}
void FrameRateController::DidSwapBuffers() {
num_frames_pending_++;
}
void FrameRateController::DidSwapBuffersComplete() {
DCHECK_GT(num_frames_pending_, 0);
num_frames_pending_--;
if (!is_time_source_throttling_)
PostManualTick();
}
void FrameRateController::DidAbortAllPendingFrames() {
num_frames_pending_ = 0;
}
base::TimeTicks FrameRateController::NextTickTime() {
if (is_time_source_throttling_)
return time_source_->NextTickTime();
return base::TimeTicks();
}
base::TimeTicks FrameRateController::LastTickTime() {
if (is_time_source_throttling_)
return time_source_->LastTickTime();
return base::TimeTicks::Now();
}
} // namespace cc
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