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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. 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 "ViewSnapshotStore.h"
#include "WebBackForwardList.h"
#include "WebPageProxy.h"
#include <wtf/NeverDestroyed.h>
#if PLATFORM(IOS_FAMILY)
static const size_t maximumSnapshotCacheSize = 50 * (1024 * 1024);
#else
static const size_t maximumSnapshotCacheSize = 400 * (1024 * 1024);
#endif
namespace WebKit {
using namespace WebCore;
ViewSnapshotStore::ViewSnapshotStore()
{
}
ViewSnapshotStore::~ViewSnapshotStore()
{
discardSnapshotImages();
}
ViewSnapshotStore& ViewSnapshotStore::singleton()
{
static NeverDestroyed<ViewSnapshotStore> store;
return store;
}
void ViewSnapshotStore::didAddImageToSnapshot(ViewSnapshot& snapshot)
{
bool isNewEntry = m_snapshotsWithImages.add(&snapshot).isNewEntry;
ASSERT_UNUSED(isNewEntry, isNewEntry);
m_snapshotCacheSize += snapshot.estimatedImageSizeInBytes();
}
void ViewSnapshotStore::willRemoveImageFromSnapshot(ViewSnapshot& snapshot)
{
bool removed = m_snapshotsWithImages.remove(&snapshot);
ASSERT_UNUSED(removed, removed);
m_snapshotCacheSize -= snapshot.estimatedImageSizeInBytes();
}
void ViewSnapshotStore::pruneSnapshots(WebPageProxy& webPageProxy)
{
if (m_snapshotCacheSize <= maximumSnapshotCacheSize)
return;
ASSERT(!m_snapshotsWithImages.isEmpty());
// FIXME: We have enough information to do smarter-than-LRU eviction (making use of the back-forward lists, etc.)
m_snapshotsWithImages.first()->clearImage();
}
void ViewSnapshotStore::recordSnapshot(WebPageProxy& webPageProxy, WebBackForwardListItem& item)
{
if (webPageProxy.isShowingNavigationGestureSnapshot())
return;
pruneSnapshots(webPageProxy);
webPageProxy.willRecordNavigationSnapshot(item);
auto snapshot = webPageProxy.takeViewSnapshot(std::nullopt);
if (!snapshot)
return;
#if PLATFORM(MAC)
snapshot->setVolatile(true);
#endif
snapshot->setRenderTreeSize(webPageProxy.renderTreeSize());
snapshot->setDeviceScaleFactor(webPageProxy.deviceScaleFactor());
snapshot->setBackgroundColor(webPageProxy.pageExtendedBackgroundColor());
snapshot->setViewScrollPosition(WebCore::roundedIntPoint(webPageProxy.viewScrollPosition()));
snapshot->setOrigin(WebCore::SecurityOriginData::fromURL(URL(item.url())));
item.setSnapshot(WTFMove(snapshot));
}
void ViewSnapshotStore::discardSnapshotImages()
{
while (!m_snapshotsWithImages.isEmpty())
m_snapshotsWithImages.first()->clearImage();
}
void ViewSnapshotStore::discardSnapshotImagesForOrigin(const WebCore::SecurityOriginData& origin)
{
for (auto it = m_snapshotsWithImages.begin(); it != m_snapshotsWithImages.end();) {
auto viewSnapshot = *it;
++it;
if (viewSnapshot->origin() == origin)
viewSnapshot->clearImage();
}
}
ViewSnapshot::~ViewSnapshot()
{
clearImage();
}
} // namespace WebKit
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