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/*
* Copyright (C) 2020 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. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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"
#include "RemoteResourceCache.h"
#if ENABLE(GPU_PROCESS)
namespace WebKit {
using namespace WebCore;
void RemoteResourceCache::cacheImageBuffer(Ref<ImageBuffer>&& imageBuffer)
{
auto renderingResourceIdentifier = imageBuffer->renderingResourceIdentifier();
m_imageBuffers.add(renderingResourceIdentifier, WTFMove(imageBuffer));
ensureResourceUseCounter(renderingResourceIdentifier);
}
ImageBuffer* RemoteResourceCache::cachedImageBuffer(RenderingResourceIdentifier renderingResourceIdentifier)
{
return m_imageBuffers.get(renderingResourceIdentifier);
}
void RemoteResourceCache::cacheNativeImage(Ref<NativeImage>&& image)
{
auto renderingResourceIdentifier = image->renderingResourceIdentifier();
m_nativeImages.add(renderingResourceIdentifier, WTFMove(image));
ensureResourceUseCounter(renderingResourceIdentifier);
}
void RemoteResourceCache::cacheFont(Ref<Font>&& font)
{
auto renderingResourceIdentifier = font->renderingResourceIdentifier();
m_fonts.add(renderingResourceIdentifier, WTFMove(font));
ensureResourceUseCounter(renderingResourceIdentifier);
}
void RemoteResourceCache::ensureResourceUseCounter(RenderingResourceIdentifier renderingResourceIdentifier)
{
auto result = m_resourceUseCounters.add(renderingResourceIdentifier, ResourceUseCounter { });
if (!result.isNewEntry) {
auto& state = result.iterator->value.state;
// FIXME: We should consider making this assertion MESSAGE_CHECK the web process.
ASSERT(state == ResourceState::ToBeDeleted);
state = ResourceState::Alive;
}
}
void RemoteResourceCache::deleteAllFonts()
{
m_fonts.clear();
}
bool RemoteResourceCache::maybeRemoveResource(RenderingResourceIdentifier renderingResourceIdentifier, ResourceUseCountersMap::iterator& iterator)
{
auto& value = iterator->value;
if (value.state == ResourceState::Alive || value.useOrPendingCount < 0)
return true;
if (value.useOrPendingCount) {
// This means we've hit a situation that's something like the following:
//
// The WP sends:
// 1. Send cache resource message
// 2. Use resource 2x
// 3. Send release resource message with useCount = 2
// 4. Send cache resource message again for the same resource
// 5. Use resource 4 times
// 6. Send release resource message with useCount = 4
//
// The GPUP sees:
// 1. The cache resource message
// 2. Use resource 2x
// 3. Use resource 3x more times (from step 5 above)
// 4. Release resource message with useCount = 2 <== This part right here
// 5. ... more stuff ...
//
// In this situation, we've got a head-start on a future frame's rendering commands,
// using a resource which was cached from a previous frame. (This is not a problem.)
// Therefore, we know that, in the future, there's going to be another cache resource
// message which will want us to cache this exact same resource that we already have
// cached.
//
// So, let's just not remove the resource, just in case there are _more_ rendering
// commands we can get a head start on before the cache resource message eventually
// gets delivered. The eventual cache resource command is smart enough to realize that
// the thing it's supposed to be caching is already in the cache, and will correctly
// do nothing.
return true;
}
m_resourceUseCounters.remove(iterator);
if (m_imageBuffers.remove(renderingResourceIdentifier))
return true;
if (m_nativeImages.remove(renderingResourceIdentifier))
return true;
if (m_fonts.remove(renderingResourceIdentifier))
return true;
// Caching the remote resource should have happened before releasing it.
return false;
}
void RemoteResourceCache::recordResourceUse(RenderingResourceIdentifier renderingResourceIdentifier)
{
auto iterator = m_resourceUseCounters.find(renderingResourceIdentifier);
ASSERT(iterator != m_resourceUseCounters.end());
ResourceUseCounter& useCounter = iterator->value;
++useCounter.useOrPendingCount;
maybeRemoveResource(renderingResourceIdentifier, iterator);
}
bool RemoteResourceCache::releaseRemoteResource(RenderingResourceIdentifier renderingResourceIdentifier, uint64_t useCount)
{
auto iterator = m_resourceUseCounters.find(renderingResourceIdentifier);
if (iterator == m_resourceUseCounters.end())
return false;
ResourceUseCounter& useCounter = iterator->value;
useCounter.state = ResourceState::ToBeDeleted;
useCounter.useOrPendingCount -= useCount;
return maybeRemoveResource(renderingResourceIdentifier, iterator);
}
} // namespace WebKit
#endif // ENABLE(GPU_PROCESS)
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