92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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* Copyright (C) 2014 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "TileControllerMemoryHandlerIOS.h"
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#if PLATFORM(IOS_FAMILY)
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#include "TileController.h"
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#include <wtf/MemoryPressureHandler.h>
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#include <wtf/NeverDestroyed.h>
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namespace WebCore {
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static const unsigned kMaxCountOfUnparentedTiledLayers = 16;
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void TileControllerMemoryHandler::removeTileController(TileController* controller)
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{
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if (m_tileControllers.contains(controller))
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m_tileControllers.remove(controller);
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}
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unsigned TileControllerMemoryHandler::totalUnparentedTiledLayers() const
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{
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unsigned totalUnparentedLayers = 0;
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for (ListHashSet<TileController*>::const_iterator it = m_tileControllers.begin(); it != m_tileControllers.end(); ++it) {
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TileController* tileController = *it;
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totalUnparentedLayers += tileController->numberOfUnparentedTiles();
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}
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return totalUnparentedLayers;
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}
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void TileControllerMemoryHandler::tileControllerGainedUnparentedTiles(TileController* controller)
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{
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m_tileControllers.appendOrMoveToLast(controller);
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// If we are under memory pressure, remove all unparented tiles now.
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if (MemoryPressureHandler::singleton().isUnderMemoryPressure()) {
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trimUnparentedTilesToTarget(0);
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return;
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}
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if (totalUnparentedTiledLayers() < kMaxCountOfUnparentedTiledLayers)
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return;
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trimUnparentedTilesToTarget(kMaxCountOfUnparentedTiledLayers);
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}
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void TileControllerMemoryHandler::trimUnparentedTilesToTarget(int target)
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{
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while (!m_tileControllers.isEmpty()) {
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TileController* tileController = m_tileControllers.first();
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tileController->removeUnparentedTilesNow();
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m_tileControllers.removeFirst();
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if (target > 0 && totalUnparentedTiledLayers() < static_cast<unsigned>(target))
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return;
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}
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}
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TileControllerMemoryHandler& tileControllerMemoryHandler()
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{
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static NeverDestroyed<TileControllerMemoryHandler> staticTileControllerMemoryHandler;
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return staticTileControllerMemoryHandler;
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}
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}
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#endif // PLATFORM(IOS_FAMILY)
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