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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. ``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
* 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.
*/
#pragma once
#if ENABLE(GPU_PROCESS)
#include <WebCore/Font.h>
#include <WebCore/ImageBuffer.h>
#include <WebCore/NativeImage.h>
#include <WebCore/RenderingResourceIdentifier.h>
#include <wtf/HashMap.h>
namespace WebKit {
class RemoteRenderingBackend;
class RemoteResourceCache {
public:
RemoteResourceCache() = default;
void cacheImageBuffer(Ref<WebCore::ImageBuffer>&&);
WebCore::ImageBuffer* cachedImageBuffer(WebCore::RenderingResourceIdentifier);
void cacheNativeImage(Ref<WebCore::NativeImage>&&);
void cacheFont(Ref<WebCore::Font>&&);
void deleteAllFonts();
bool releaseRemoteResource(WebCore::RenderingResourceIdentifier, uint64_t useCount);
void recordResourceUse(WebCore::RenderingResourceIdentifier);
const WebCore::ImageBufferHashMap& imageBuffers() const { return m_imageBuffers; }
const WebCore::NativeImageHashMap& nativeImages() const { return m_nativeImages; }
const WebCore::FontRenderingResourceMap& fonts() const { return m_fonts; }
private:
// Because the cache/release messages are sent asynchronously from the display list items which
// reference the resources, it's totally possible that we see a release message before we've
// executed all the display list items which reference the resource. The web process tells us
// how many display list items will reference this resource, and we defer deletion of the resource
// until we execute that many display list items. It's actually a bit worse than this, though,
// because we may actually see a *new* cache message during the time when deletion is deferred.
//
// We can only safely delete a resource when:
// 1. All the cache messages have an accompanying release message, and
// 2. We've processed as many display list items that reference a particular resource as the web
// process has encoded.
enum class ResourceState {
Alive,
ToBeDeleted
};
struct ResourceUseCounter {
ResourceState state { ResourceState::Alive };
int64_t useOrPendingCount { 0 };
};
using ResourceUseCountersMap = HashMap<WebCore::RenderingResourceIdentifier, ResourceUseCounter>;
bool maybeRemoveResource(WebCore::RenderingResourceIdentifier, ResourceUseCountersMap::iterator&);
void ensureResourceUseCounter(WebCore::RenderingResourceIdentifier);
WebCore::ImageBufferHashMap m_imageBuffers;
WebCore::NativeImageHashMap m_nativeImages;
WebCore::FontRenderingResourceMap m_fonts;
ResourceUseCountersMap m_resourceUseCounters;
};
} // namespace WebKit
#endif // ENABLE(GPU_PROCESS)
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