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/*
* Copyright (C) 2014 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
#import <WebCore/Timer.h>
#import <wtf/HashSet.h>
#import <wtf/Noncopyable.h>
#import <wtf/OptionSet.h>
#import <wtf/WeakPtr.h>
namespace WebCore {
class ImageBuffer;
class ThreadSafeImageBufferFlusher;
enum class SetNonVolatileResult : uint8_t;
}
namespace WebKit {
class RemoteLayerBackingStore;
class RemoteLayerTreeContext;
class RemoteLayerTreeTransaction;
enum class SwapBuffersDisplayRequirement : uint8_t;
class RemoteLayerBackingStoreCollection : public CanMakeWeakPtr<RemoteLayerBackingStoreCollection> {
WTF_MAKE_NONCOPYABLE(RemoteLayerBackingStoreCollection);
WTF_MAKE_FAST_ALLOCATED;
public:
RemoteLayerBackingStoreCollection(RemoteLayerTreeContext&);
virtual ~RemoteLayerBackingStoreCollection();
void backingStoreWasCreated(RemoteLayerBackingStore&);
void backingStoreWillBeDestroyed(RemoteLayerBackingStore&);
// Return value indicates whether the backing store needs to be included in the transaction.
bool backingStoreWillBeDisplayed(RemoteLayerBackingStore&);
void backingStoreBecameUnreachable(RemoteLayerBackingStore&);
virtual void prepareBackingStoresForDisplay(RemoteLayerTreeTransaction&);
bool paintReachableBackingStoreContents();
void willFlushLayers();
void willCommitLayerTree(RemoteLayerTreeTransaction&);
Vector<std::unique_ptr<WebCore::ThreadSafeImageBufferFlusher>> didFlushLayers(RemoteLayerTreeTransaction&);
virtual void tryMarkAllBackingStoreVolatile(CompletionHandler<void(bool)>&&);
void scheduleVolatilityTimer();
virtual RefPtr<WebCore::ImageBuffer> allocateBufferForBackingStore(const RemoteLayerBackingStore&);
protected:
RemoteLayerTreeContext& layerTreeContext() const { return m_layerTreeContext; }
enum class VolatilityMarkingBehavior : uint8_t {
IgnoreReachability = 1 << 0,
ConsiderTimeSinceLastDisplay = 1 << 1,
};
virtual void markBackingStoreVolatileAfterReachabilityChange(RemoteLayerBackingStore&);
virtual void markAllBackingStoreVolatileFromTimer();
private:
bool markBackingStoreVolatile(RemoteLayerBackingStore&, OptionSet<VolatilityMarkingBehavior> = { }, MonotonicTime = { });
bool markAllBackingStoreVolatile(OptionSet<VolatilityMarkingBehavior> liveBackingStoreMarkingBehavior, OptionSet<VolatilityMarkingBehavior> unparentedBackingStoreMarkingBehavior);
bool updateUnreachableBackingStores();
void volatilityTimerFired();
protected:
static constexpr auto volatileBackingStoreAgeThreshold = 1_s;
static constexpr auto volatileSecondaryBackingStoreAgeThreshold = 200_ms;
RemoteLayerTreeContext& m_layerTreeContext;
HashSet<RemoteLayerBackingStore*> m_liveBackingStore;
HashSet<RemoteLayerBackingStore*> m_unparentedBackingStore;
// Only used during a single flush.
HashSet<RemoteLayerBackingStore*> m_reachableBackingStoreInLatestFlush;
HashSet<RemoteLayerBackingStore*> m_backingStoresNeedingDisplay;
WebCore::Timer m_volatilityTimer;
bool m_inLayerFlush { false };
};
} // namespace WebKit
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