| // 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/frame_rate_controller.h" |
| |
| #include "base/debug/trace_event.h" |
| #include "base/logging.h" |
| #include "cc/delay_based_time_source.h" |
| #include "cc/time_source.h" |
| #include "cc/thread.h" |
| |
| namespace { |
| |
| // This will be the maximum number of pending frames unless |
| // FrameRateController::setMaxFramesPending is called. |
| const int defaultMaxFramesPending = 2; |
| |
| } // namespace |
| |
| namespace cc { |
| |
| class FrameRateControllerTimeSourceAdapter : public TimeSourceClient { |
| public: |
| static scoped_ptr<FrameRateControllerTimeSourceAdapter> create(FrameRateController* frameRateController) { |
| return make_scoped_ptr(new FrameRateControllerTimeSourceAdapter(frameRateController)); |
| } |
| virtual ~FrameRateControllerTimeSourceAdapter() {} |
| |
| virtual void onTimerTick() OVERRIDE { |
| m_frameRateController->onTimerTick(); |
| } |
| |
| private: |
| explicit FrameRateControllerTimeSourceAdapter(FrameRateController* frameRateController) |
| : m_frameRateController(frameRateController) {} |
| |
| FrameRateController* m_frameRateController; |
| }; |
| |
| FrameRateController::FrameRateController(scoped_refptr<TimeSource> timer) |
| : m_client(0) |
| , m_numFramesPending(0) |
| , m_maxFramesPending(defaultMaxFramesPending) |
| , m_timeSource(timer) |
| , m_active(false) |
| , m_swapBuffersCompleteSupported(true) |
| , m_isTimeSourceThrottling(true) |
| , m_thread(0) |
| , m_weakFactory(ALLOW_THIS_IN_INITIALIZER_LIST(this)) |
| { |
| m_timeSourceClientAdapter = FrameRateControllerTimeSourceAdapter::create(this); |
| m_timeSource->setClient(m_timeSourceClientAdapter.get()); |
| } |
| |
| FrameRateController::FrameRateController(Thread* thread) |
| : m_client(0) |
| , m_numFramesPending(0) |
| , m_maxFramesPending(defaultMaxFramesPending) |
| , m_active(false) |
| , m_swapBuffersCompleteSupported(true) |
| , m_isTimeSourceThrottling(false) |
| , m_thread(thread) |
| , m_weakFactory(ALLOW_THIS_IN_INITIALIZER_LIST(this)) |
| { |
| } |
| |
| FrameRateController::~FrameRateController() |
| { |
| if (m_isTimeSourceThrottling) |
| m_timeSource->setActive(false); |
| } |
| |
| void FrameRateController::setActive(bool active) |
| { |
| if (m_active == active) |
| return; |
| TRACE_EVENT1("cc", "FrameRateController::setActive", "active", active); |
| m_active = active; |
| |
| if (m_isTimeSourceThrottling) |
| m_timeSource->setActive(active); |
| else { |
| if (active) |
| postManualTick(); |
| else |
| m_weakFactory.InvalidateWeakPtrs(); |
| } |
| } |
| |
| void FrameRateController::setMaxFramesPending(int maxFramesPending) |
| { |
| DCHECK(maxFramesPending > 0); |
| m_maxFramesPending = maxFramesPending; |
| } |
| |
| void FrameRateController::setTimebaseAndInterval(base::TimeTicks timebase, base::TimeDelta interval) |
| { |
| if (m_isTimeSourceThrottling) |
| m_timeSource->setTimebaseAndInterval(timebase, interval); |
| } |
| |
| void FrameRateController::setSwapBuffersCompleteSupported(bool supported) |
| { |
| m_swapBuffersCompleteSupported = supported; |
| } |
| |
| void FrameRateController::onTimerTick() |
| { |
| DCHECK(m_active); |
| |
| // Check if we have too many frames in flight. |
| bool throttled = m_numFramesPending >= m_maxFramesPending; |
| TRACE_COUNTER_ID1("cc", "ThrottledVSyncInterval", m_thread, throttled); |
| |
| if (m_client) |
| m_client->vsyncTick(throttled); |
| |
| if (m_swapBuffersCompleteSupported && !m_isTimeSourceThrottling && m_numFramesPending < m_maxFramesPending) |
| postManualTick(); |
| } |
| |
| void FrameRateController::postManualTick() |
| { |
| if (m_active) |
| m_thread->postTask(base::Bind(&FrameRateController::manualTick, m_weakFactory.GetWeakPtr())); |
| } |
| |
| void FrameRateController::manualTick() |
| { |
| onTimerTick(); |
| } |
| |
| void FrameRateController::didBeginFrame() |
| { |
| if (m_swapBuffersCompleteSupported) |
| m_numFramesPending++; |
| else if (!m_isTimeSourceThrottling) |
| postManualTick(); |
| } |
| |
| void FrameRateController::didFinishFrame() |
| { |
| DCHECK(m_swapBuffersCompleteSupported); |
| |
| m_numFramesPending--; |
| if (!m_isTimeSourceThrottling) |
| postManualTick(); |
| } |
| |
| void FrameRateController::didAbortAllPendingFrames() |
| { |
| m_numFramesPending = 0; |
| } |
| |
| base::TimeTicks FrameRateController::nextTickTime() |
| { |
| if (m_isTimeSourceThrottling) |
| return m_timeSource->nextTickTime(); |
| |
| return base::TimeTicks(); |
| } |
| |
| } // namespace cc |