webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 443 insertions, 0 deletions

diff --git a/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp
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+/*
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+ * Copyright (C) 2013 Company 100, 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 "CompositingCoordinator.h"
+
+#if USE(COORDINATED_GRAPHICS)
+
+#include <WebCore/DOMWindow.h>
+#include <WebCore/Document.h>
+#include <WebCore/FrameView.h>
+#include <WebCore/GraphicsContext.h>
+#include <WebCore/InspectorController.h>
+#include <WebCore/MainFrame.h>
+#include <WebCore/MemoryPressureHandler.h>
+#include <WebCore/Page.h>
+#include <wtf/SetForScope.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+CompositingCoordinator::CompositingCoordinator(Page* page, CompositingCoordinator::Client& client)
+    : m_page(page)
+    , m_client(client)
+    , m_releaseInactiveAtlasesTimer(*this, &CompositingCoordinator::releaseInactiveAtlasesTimerFired)
+{
+}
+
+CompositingCoordinator::~CompositingCoordinator()
+{
+    m_isDestructing = true;
+
+    purgeBackingStores();
+
+    for (auto& registeredLayer : m_registeredLayers.values())
+        registeredLayer->setCoordinator(nullptr);
+}
+
+void CompositingCoordinator::invalidate()
+{
+    m_rootLayer = nullptr;
+    purgeBackingStores();
+}
+
+void CompositingCoordinator::setRootCompositingLayer(GraphicsLayer* graphicsLayer)
+{
+    if (m_rootCompositingLayer == graphicsLayer)
+        return;
+
+    if (m_rootCompositingLayer)
+        m_rootCompositingLayer->removeFromParent();
+
+    m_rootCompositingLayer = graphicsLayer;
+    if (m_rootCompositingLayer)
+        m_rootLayer->addChildAtIndex(m_rootCompositingLayer, 0);
+}
+
+void CompositingCoordinator::setViewOverlayRootLayer(GraphicsLayer* graphicsLayer)
+{
+    if (m_overlayCompositingLayer == graphicsLayer)
+        return;
+
+    if (m_overlayCompositingLayer)
+        m_overlayCompositingLayer->removeFromParent();
+
+    m_overlayCompositingLayer = graphicsLayer;
+    if (m_overlayCompositingLayer)
+        m_rootLayer->addChild(m_overlayCompositingLayer);
+}
+
+void CompositingCoordinator::sizeDidChange(const IntSize& newSize)
+{
+    m_rootLayer->setSize(newSize);
+    notifyFlushRequired(m_rootLayer.get());
+}
+
+bool CompositingCoordinator::flushPendingLayerChanges()
+{
+    SetForScope<bool> protector(m_isFlushingLayerChanges, true);
+
+    initializeRootCompositingLayerIfNeeded();
+
+    m_rootLayer->flushCompositingStateForThisLayerOnly();
+    m_client.didFlushRootLayer(m_visibleContentsRect);
+
+    if (m_overlayCompositingLayer)
+        m_overlayCompositingLayer->flushCompositingState(FloatRect(FloatPoint(), m_rootLayer->size()));
+
+    bool didSync = m_page->mainFrame().view()->flushCompositingStateIncludingSubframes();
+
+    auto& coordinatedLayer = downcast<CoordinatedGraphicsLayer>(*m_rootLayer);
+    coordinatedLayer.updateContentBuffersIncludingSubLayers();
+    coordinatedLayer.syncPendingStateChangesIncludingSubLayers();
+
+    flushPendingImageBackingChanges();
+
+    if (m_shouldSyncFrame) {
+        didSync = true;
+
+        if (m_rootCompositingLayer) {
+            m_state.contentsSize = roundedIntSize(m_rootCompositingLayer->size());
+            if (CoordinatedGraphicsLayer* contentsLayer = mainContentsLayer())
+                m_state.coveredRect = contentsLayer->coverRect();
+        }
+        m_state.scrollPosition = m_visibleContentsRect.location();
+
+        m_client.commitSceneState(m_state);
+
+        clearPendingStateChanges();
+        m_shouldSyncFrame = false;
+    }
+
+    return didSync;
+}
+
+double CompositingCoordinator::timestamp() const
+{
+    auto* document = m_page->mainFrame().document();
+    if (!document)
+        return 0;
+    return document->domWindow() ? document->domWindow()->nowTimestamp() : document->monotonicTimestamp();
+}
+
+void CompositingCoordinator::syncDisplayState()
+{
+#if !USE(REQUEST_ANIMATION_FRAME_TIMER) && !USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
+    // Make sure that any previously registered animation callbacks are being executed before we flush the layers.
+    m_lastAnimationServiceTime = timestamp();
+    m_page->mainFrame().view()->serviceScriptedAnimations();
+#endif
+    m_page->mainFrame().view()->updateLayoutAndStyleIfNeededRecursive();
+}
+
+double CompositingCoordinator::nextAnimationServiceTime() const
+{
+    // According to the requestAnimationFrame spec, rAF callbacks should not be faster than 60FPS.
+    static const double MinimalTimeoutForAnimations = 1. / 60.;
+    return std::max<double>(0., MinimalTimeoutForAnimations - timestamp() + m_lastAnimationServiceTime);
+}
+
+void CompositingCoordinator::clearPendingStateChanges()
+{
+    m_state.layersToCreate.clear();
+    m_state.layersToUpdate.clear();
+    m_state.layersToRemove.clear();
+
+    m_state.imagesToCreate.clear();
+    m_state.imagesToRemove.clear();
+    m_state.imagesToUpdate.clear();
+    m_state.imagesToClear.clear();
+
+    m_state.updateAtlasesToCreate.clear();
+    m_state.updateAtlasesToRemove.clear();
+}
+
+void CompositingCoordinator::initializeRootCompositingLayerIfNeeded()
+{
+    if (m_didInitializeRootCompositingLayer)
+        return;
+
+    m_state.rootCompositingLayer = downcast<CoordinatedGraphicsLayer>(*m_rootLayer).id();
+    m_didInitializeRootCompositingLayer = true;
+    m_shouldSyncFrame = true;
+}
+
+void CompositingCoordinator::createRootLayer(const IntSize& size)
+{
+    ASSERT(!m_rootLayer);
+    // Create a root layer.
+    m_rootLayer = GraphicsLayer::create(this, *this);
+#ifndef NDEBUG
+    m_rootLayer->setName("CompositingCoordinator root layer");
+#endif
+    m_rootLayer->setDrawsContent(false);
+    m_rootLayer->setSize(size);
+}
+
+void CompositingCoordinator::syncLayerState(CoordinatedLayerID id, CoordinatedGraphicsLayerState& state)
+{
+    m_shouldSyncFrame = true;
+    m_state.layersToUpdate.append(std::make_pair(id, state));
+}
+
+Ref<CoordinatedImageBacking> CompositingCoordinator::createImageBackingIfNeeded(Image* image)
+{
+    CoordinatedImageBackingID imageID = CoordinatedImageBacking::getCoordinatedImageBackingID(image);
+    auto addResult = m_imageBackings.ensure(imageID, [this, image] {
+        return CoordinatedImageBacking::create(this, image);
+    });
+    return *addResult.iterator->value;
+}
+
+void CompositingCoordinator::createImageBacking(CoordinatedImageBackingID imageID)
+{
+    m_state.imagesToCreate.append(imageID);
+}
+
+void CompositingCoordinator::updateImageBacking(CoordinatedImageBackingID imageID, RefPtr<CoordinatedSurface>&& coordinatedSurface)
+{
+    m_shouldSyncFrame = true;
+    m_state.imagesToUpdate.append(std::make_pair(imageID, WTFMove(coordinatedSurface)));
+}
+
+void CompositingCoordinator::clearImageBackingContents(CoordinatedImageBackingID imageID)
+{
+    m_shouldSyncFrame = true;
+    m_state.imagesToClear.append(imageID);
+}
+
+void CompositingCoordinator::removeImageBacking(CoordinatedImageBackingID imageID)
+{
+    if (m_isPurging)
+        return;
+
+    ASSERT(m_imageBackings.contains(imageID));
+    m_imageBackings.remove(imageID);
+
+    m_state.imagesToRemove.append(imageID);
+
+    size_t imageIDPosition = m_state.imagesToClear.find(imageID);
+    if (imageIDPosition != notFound)
+        m_state.imagesToClear.remove(imageIDPosition);
+}
+
+void CompositingCoordinator::flushPendingImageBackingChanges()
+{
+    for (auto& imageBacking : m_imageBackings.values())
+        imageBacking->update();
+}
+
+void CompositingCoordinator::notifyAnimationStarted(const GraphicsLayer*, const String&, double /* time */)
+{
+}
+
+void CompositingCoordinator::notifyFlushRequired(const GraphicsLayer*)
+{
+    if (!m_isDestructing && !isFlushingLayerChanges())
+        m_client.notifyFlushRequired();
+}
+
+void CompositingCoordinator::paintContents(const GraphicsLayer* graphicsLayer, GraphicsContext& graphicsContext, GraphicsLayerPaintingPhase, const FloatRect& clipRect)
+{
+    m_client.paintLayerContents(graphicsLayer, graphicsContext, enclosingIntRect(clipRect));
+}
+
+std::unique_ptr<GraphicsLayer> CompositingCoordinator::createGraphicsLayer(GraphicsLayer::Type layerType, GraphicsLayerClient& client)
+{
+    CoordinatedGraphicsLayer* layer = new CoordinatedGraphicsLayer(layerType, client);
+    layer->setCoordinator(this);
+    m_registeredLayers.add(layer->id(), layer);
+    m_state.layersToCreate.append(layer->id());
+    layer->setNeedsVisibleRectAdjustment();
+    notifyFlushRequired(layer);
+    return std::unique_ptr<GraphicsLayer>(layer);
+}
+
+float CompositingCoordinator::deviceScaleFactor() const
+{
+    return m_page->deviceScaleFactor();
+}
+
+float CompositingCoordinator::pageScaleFactor() const
+{
+    return m_page->pageScaleFactor();
+}
+
+void CompositingCoordinator::createUpdateAtlas(uint32_t atlasID, RefPtr<CoordinatedSurface>&& coordinatedSurface)
+{
+    m_state.updateAtlasesToCreate.append(std::make_pair(atlasID, WTFMove(coordinatedSurface)));
+}
+
+void CompositingCoordinator::removeUpdateAtlas(uint32_t atlasID)
+{
+    if (m_isPurging)
+        return;
+    m_state.updateAtlasesToRemove.append(atlasID);
+}
+
+FloatRect CompositingCoordinator::visibleContentsRect() const
+{
+    return m_visibleContentsRect;
+}
+
+CoordinatedGraphicsLayer* CompositingCoordinator::mainContentsLayer()
+{
+    if (!is<CoordinatedGraphicsLayer>(m_rootCompositingLayer))
+        return nullptr;
+
+    return downcast<CoordinatedGraphicsLayer>(*m_rootCompositingLayer).findFirstDescendantWithContentsRecursively();
+}
+
+void CompositingCoordinator::setVisibleContentsRect(const FloatRect& rect, const FloatPoint& trajectoryVector)
+{
+    // A zero trajectoryVector indicates that tiles all around the viewport are requested.
+    if (CoordinatedGraphicsLayer* contentsLayer = mainContentsLayer())
+        contentsLayer->setVisibleContentRectTrajectoryVector(trajectoryVector);
+
+    bool contentsRectDidChange = rect != m_visibleContentsRect;
+    if (contentsRectDidChange) {
+        m_visibleContentsRect = rect;
+
+        for (auto& registeredLayer : m_registeredLayers.values())
+            registeredLayer->setNeedsVisibleRectAdjustment();
+    }
+
+    FrameView* view = m_page->mainFrame().view();
+    if (view->useFixedLayout() && contentsRectDidChange) {
+        // Round the rect instead of enclosing it to make sure that its size stays
+        // the same while panning. This can have nasty effects on layout.
+        view->setFixedVisibleContentRect(roundedIntRect(rect));
+    }
+}
+
+void CompositingCoordinator::deviceOrPageScaleFactorChanged()
+{
+    m_rootLayer->deviceOrPageScaleFactorChanged();
+}
+
+void CompositingCoordinator::detachLayer(CoordinatedGraphicsLayer* layer)
+{
+    if (m_isPurging)
+        return;
+
+    m_registeredLayers.remove(layer->id());
+
+    size_t index = m_state.layersToCreate.find(layer->id());
+    if (index != notFound) {
+        m_state.layersToCreate.remove(index);
+        return;
+    }
+
+    m_state.layersToRemove.append(layer->id());
+    notifyFlushRequired(layer);
+}
+
+void CompositingCoordinator::commitScrollOffset(uint32_t layerID, const WebCore::IntSize& offset)
+{
+    if (auto* layer = m_registeredLayers.get(layerID))
+        layer->commitScrollOffset(offset);
+}
+
+void CompositingCoordinator::renderNextFrame()
+{
+    for (auto& atlas : m_updateAtlases)
+        atlas->didSwapBuffers();
+}
+
+void CompositingCoordinator::purgeBackingStores()
+{
+    SetForScope<bool> purgingToggle(m_isPurging, true);
+
+    for (auto& registeredLayer : m_registeredLayers.values())
+        registeredLayer->purgeBackingStores();
+
+    m_imageBackings.clear();
+    m_updateAtlases.clear();
+}
+
+bool CompositingCoordinator::paintToSurface(const IntSize& size, CoordinatedSurface::Flags flags, uint32_t& atlasID, IntPoint& offset, CoordinatedSurface::Client& client)
+{
+    for (auto& updateAtlas : m_updateAtlases) {
+        UpdateAtlas* atlas = updateAtlas.get();
+        if (atlas->supportsAlpha() == (flags & CoordinatedSurface::SupportsAlpha)) {
+            // This will be false if there is no available buffer space.
+            if (atlas->paintOnAvailableBuffer(size, atlasID, offset, client))
+                return true;
+        }
+    }
+
+    static const int ScratchBufferDimension = 1024; // Should be a power of two.
+    m_updateAtlases.append(std::make_unique<UpdateAtlas>(*this, ScratchBufferDimension, flags));
+    scheduleReleaseInactiveAtlases();
+    return m_updateAtlases.last()->paintOnAvailableBuffer(size, atlasID, offset, client);
+}
+
+const double ReleaseInactiveAtlasesTimerInterval = 0.5;
+
+void CompositingCoordinator::scheduleReleaseInactiveAtlases()
+{
+    if (!m_releaseInactiveAtlasesTimer.isActive())
+        m_releaseInactiveAtlasesTimer.startRepeating(ReleaseInactiveAtlasesTimerInterval);
+}
+
+void CompositingCoordinator::releaseInactiveAtlasesTimerFired()
+{
+    releaseAtlases(MemoryPressureHandler::singleton().isUnderMemoryPressure() ? ReleaseUnused : ReleaseInactive);
+}
+
+void CompositingCoordinator::releaseAtlases(ReleaseAtlasPolicy policy)
+{
+    // We always want to keep one atlas for root contents layer.
+    std::unique_ptr<UpdateAtlas> atlasToKeepAnyway;
+    bool foundActiveAtlasForRootContentsLayer = false;
+    for (int i = m_updateAtlases.size() - 1;  i >= 0; --i) {
+        UpdateAtlas* atlas = m_updateAtlases[i].get();
+        bool inUse = atlas->isInUse();
+        if (!inUse)
+            atlas->addTimeInactive(ReleaseInactiveAtlasesTimerInterval);
+        bool usableForRootContentsLayer = !atlas->supportsAlpha();
+        if (atlas->isInactive() || (!inUse && policy == ReleaseUnused)) {
+            if (!foundActiveAtlasForRootContentsLayer && !atlasToKeepAnyway && usableForRootContentsLayer)
+                atlasToKeepAnyway = WTFMove(m_updateAtlases[i]);
+            m_updateAtlases.remove(i);
+        } else if (usableForRootContentsLayer)
+            foundActiveAtlasForRootContentsLayer = true;
+    }
+
+    if (!foundActiveAtlasForRootContentsLayer && atlasToKeepAnyway)
+        m_updateAtlases.append(atlasToKeepAnyway.release());
+
+    m_updateAtlases.shrinkToFit();
+
+    if (m_updateAtlases.size() <= 1)
+        m_releaseInactiveAtlasesTimer.stop();
+}
+
+} // namespace WebKit
+
+#endif // USE(COORDINATED_GRAPHICS)