| /* |
| * 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.imageSizeInBytes(); |
| } |
| |
| void ViewSnapshotStore::willRemoveImageFromSnapshot(ViewSnapshot& snapshot) |
| { |
| bool removed = m_snapshotsWithImages.remove(&snapshot); |
| ASSERT_UNUSED(removed, removed); |
| m_snapshotCacheSize -= snapshot.imageSizeInBytes(); |
| } |
| |
| 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(); |
| if (!snapshot) |
| return; |
| |
| snapshot->setRenderTreeSize(webPageProxy.renderTreeSize()); |
| snapshot->setDeviceScaleFactor(webPageProxy.deviceScaleFactor()); |
| snapshot->setBackgroundColor(webPageProxy.pageExtendedBackgroundColor()); |
| snapshot->setViewScrollPosition(WebCore::roundedIntPoint(webPageProxy.viewScrollPosition())); |
| |
| item.setSnapshot(WTFMove(snapshot)); |
| } |
| |
| void ViewSnapshotStore::discardSnapshotImages() |
| { |
| while (!m_snapshotsWithImages.isEmpty()) |
| m_snapshotsWithImages.first()->clearImage(); |
| } |
| |
| ViewSnapshot::~ViewSnapshot() |
| { |
| clearImage(); |
| } |
| |
| } // namespace WebKit |