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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if USE(ACCELERATED_COMPOSITING)
#include "LayerFlushScheduler.h"
#include <wtf/AutodrainedPool.h>
namespace WebCore {
static const CFIndex CoreAnimationRunLoopOrder = 2000000;
static const CFIndex LayerFlushRunLoopOrder = CoreAnimationRunLoopOrder - 1;
LayerFlushScheduler::LayerFlushScheduler(LayerFlushSchedulerClient* client)
: m_isSuspended(false)
, m_client(client)
{
ASSERT_ARG(client, client);
}
LayerFlushScheduler::~LayerFlushScheduler()
{
ASSERT(!m_runLoopObserver);
}
void LayerFlushScheduler::runLoopObserverCallback(CFRunLoopObserverRef, CFRunLoopActivity, void* context)
{
static_cast<LayerFlushScheduler*>(context)->runLoopObserverCallback();
}
void LayerFlushScheduler::runLoopObserverCallback()
{
ASSERT(m_runLoopObserver);
ASSERT(!m_isSuspended);
AutodrainedPool pool;
if (m_client->flushLayers())
invalidate();
}
void LayerFlushScheduler::schedule()
{
if (m_isSuspended)
return;
CFRunLoopRef currentRunLoop = CFRunLoopGetCurrent();
// Make sure we wake up the loop or the observer could be delayed until some other source fires.
CFRunLoopWakeUp(currentRunLoop);
if (m_runLoopObserver)
return;
CFRunLoopObserverContext context = { 0, this, 0, 0, 0 };
m_runLoopObserver = adoptCF(CFRunLoopObserverCreate(0, kCFRunLoopBeforeWaiting | kCFRunLoopExit, true, LayerFlushRunLoopOrder, runLoopObserverCallback, &context));
CFRunLoopAddObserver(currentRunLoop, m_runLoopObserver.get(), kCFRunLoopCommonModes);
}
void LayerFlushScheduler::invalidate()
{
if (m_runLoopObserver) {
CFRunLoopObserverInvalidate(m_runLoopObserver.get());
m_runLoopObserver = nullptr;
}
}
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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