Attachment 347355 Details for Bug 188693 – WIP

[patch] WIP

bug-188693-20180817105911.patch (text/plain), 60.21 KB, created by Zan Dobersek on 2018-08-17 01:59:13 PDT

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Creator: Zan Dobersek

Created: 2018-08-17 01:59:13 PDT

Size: 60.21 KB

patch

obsolete

>Subversion Revision: 234976
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 1e7bca7c295c97ee918c03586d16fa274dfb2490..70960c6bab900486522c76cff41741e6618b5cc4 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,30 @@
>+2018-08-17  Zan Dobersek  <zdobersek@igalia.com>
>+
>+        [CoordGraphics] Switch to Nicosia::CompositionLayer state tracking
>+        https://bugs.webkit.org/show_bug.cgi?id=188693
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        No new tests (OOPS!).
>+
>+        * platform/graphics/nicosia/NicosiaPlatformLayer.h:
>+        (Nicosia::CompositionLayer::flushState):
>+        (Nicosia::CompositionLayer::commitState):
>+        (Nicosia::CompositionLayer::accessCommitted):
>+        * platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp:
>+        (WebCore::CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer):
>+        (WebCore::CoordinatedGraphicsLayer::setContentsNeedsDisplay):
>+        (WebCore::CoordinatedGraphicsLayer::setContentsToPlatformLayer):
>+        (WebCore::CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly):
>+        (WebCore::CoordinatedGraphicsLayer::syncPendingStateChangesIncludingSubLayers):
>+        (WebCore::CoordinatedGraphicsLayer::updateContentBuffersIncludingSubLayers):
>+        (WebCore::CoordinatedGraphicsLayer::updateContentBuffers):
>+        (WebCore::CoordinatedGraphicsLayer::updateContentBuffers2):
>+        (WebCore::CoordinatedGraphicsLayer::purgeBackingStores):
>+        (WebCore::CoordinatedGraphicsLayer::adjustContentsScale): Deleted.
>+        (WebCore::CoordinatedGraphicsLayer::createBackingStore): Deleted.
>+        * platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h:
>+
> 2018-08-16  Devin Rousso  <drousso@apple.com>
> 
>         Web Inspector: support breakpoints for arbitrary event names
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index c24d48bc6cba2304b420faf873f3c549ae140c57..078e2a262ead1d4c248d0072267aa1cab35c5ffb 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,53 @@
>+2018-08-17  Zan Dobersek  <zdobersek@igalia.com>
>+
>+        [CoordGraphics] Switch to Nicosia::CompositionLayer state tracking
>+        https://bugs.webkit.org/show_bug.cgi?id=188693
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp:
>+        (WebKit::CoordinatedGraphicsScene::applyStateChanges):
>+        (WebKit::CoordinatedGraphicsScene::paintToCurrentGLContext):
>+        (WebKit::compositionLayerImpl):
>+        (WebKit::contentLayerImpl):
>+        (WebKit::backingStoreImpl):
>+        (WebKit::imageBackingImpl):
>+        (WebKit::texmapLayer):
>+        (WebKit::updateBackingStore):
>+        (WebKit::updateImageBacking):
>+        (WebKit::removeLayer):
>+        (WebKit::CoordinatedGraphicsScene::commitSceneState):
>+        (WebKit::CoordinatedGraphicsScene::updateSceneState):
>+        (WebKit::CoordinatedGraphicsScene::purgeGLResources):
>+        (WebKit::CoordinatedGraphicsScene::syncPlatformLayerIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::setLayerChildrenIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::setLayerFiltersIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::setLayerState): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::getLayerByIDIfExists): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::createLayers): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::createLayer): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::deleteLayers): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::deleteLayer): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::setRootLayerID): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::prepareContentBackingStore): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::createBackingStoreIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::removeBackingStoreIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::resetBackingStoreSizeToLayerSize): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::createTilesIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::removeTilesIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::updateTilesIfNeeded): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::syncImageBackings): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::createImageBacking): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::updateImageBacking): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::clearImageBackingContents): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::removeImageBacking): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::assignImageBackingToLayer): Deleted.
>+        (WebKit::CoordinatedGraphicsScene::setLayerAnimationsIfNeeded): Deleted.
>+        * Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h:
>+        (WebKit::CoordinatedGraphicsScene::layerByID): Deleted.
>+        * WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp:
>+        (WebKit::CompositingCoordinator::flushPendingLayerChanges):
>+
> 2018-08-16  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, rolling out r234958.
>diff --git a/Source/WebCore/platform/graphics/nicosia/NicosiaPlatformLayer.h b/Source/WebCore/platform/graphics/nicosia/NicosiaPlatformLayer.h
>index 780aceb7274447d9e493588e09c843d7200e2994..2b87bcec413d8869d5d4a6062e356d53993594fd 100644
>--- a/Source/WebCore/platform/graphics/nicosia/NicosiaPlatformLayer.h
>+++ b/Source/WebCore/platform/graphics/nicosia/NicosiaPlatformLayer.h
>@@ -180,6 +180,92 @@ public:
>         functor(m_state.pending);
>     }
> 
>+    template<typename T>
>+    void flushState(const T& functor)
>+    {
>+        LockHolder locker(PlatformLayer::m_state.lock);
>+        auto& pending = m_state.pending;
>+        auto& staging = m_state.staging;
>+
>+        staging.delta.value |= pending.delta.value;
>+
>+        if (pending.delta.positionChanged)
>+            staging.position = pending.position;
>+        if (pending.delta.anchorPointChanged)
>+            staging.anchorPoint = pending.anchorPoint;
>+        if (pending.delta.sizeChanged)
>+            staging.size = pending.size;
>+
>+        if (pending.delta.transformChanged)
>+            staging.transform = pending.transform;
>+        if (pending.delta.childrenTransformChanged)
>+            staging.childrenTransform = pending.childrenTransform;
>+
>+        if (pending.delta.contentsRectChanged)
>+            staging.contentsRect = pending.contentsRect;
>+        if (pending.delta.contentsTilingChanged) {
>+            staging.contentsTilePhase = pending.contentsTilePhase;
>+            staging.contentsTileSize = pending.contentsTileSize;
>+        }
>+
>+        if (pending.delta.opacityChanged)
>+            staging.opacity = pending.opacity;
>+        if (pending.delta.solidColorChanged)
>+            staging.solidColor = pending.solidColor;
>+
>+        if (pending.delta.filtersChanged)
>+            staging.filters = pending.filters;
>+        if (pending.delta.animationsChanged)
>+            staging.animations = pending.animations;
>+
>+        if (pending.delta.childrenChanged)
>+            staging.children = pending.children;
>+        if (pending.delta.maskChanged)
>+            staging.mask = pending.mask;
>+        if (pending.delta.replicaChanged)
>+            staging.replica = pending.replica;
>+
>+        if (pending.delta.flagsChanged)
>+            staging.flags.value = pending.flags.value;
>+
>+        if (pending.delta.repaintCounterChanged)
>+            staging.repaintCounter = pending.repaintCounter;
>+        if (pending.delta.debugBorderChanged)
>+            staging.debugBorder = pending.debugBorder;
>+
>+        if (pending.delta.contentLayerChanged)
>+            staging.contentLayer = pending.contentLayer;
>+        if (pending.delta.backingStoreChanged)
>+            staging.backingStore = pending.backingStore;
>+        if (pending.delta.imageBackingChanged)
>+            staging.imageBacking = pending.imageBacking;
>+
>+        pending.delta = { };
>+
>+        functor(staging);
>+    }
>+
>+    template<typename T>
>+    void commitState(const T& functor)
>+    {
>+        const LayerState& state =
>+            [this] {
>+                LockHolder locker(PlatformLayer::m_state.lock);
>+                m_state.committed = m_state.staging;
>+                m_state.staging.delta = { };
>+                return m_state.committed;
>+            }();
>+
>+        functor(state);
>+    }
>+
>+    template<typename T>
>+    void accessCommitted(const T& functor)
>+    {
>+        LockHolder locker(PlatformLayer::m_state.lock);
>+        functor(m_state.committed);
>+    }
>+
> private:
>     CompositionLayer(uint64_t, const Impl::Factory&);
> 
>@@ -187,6 +273,8 @@ private:
> 
>     struct {
>         LayerState pending;
>+        LayerState staging;
>+        LayerState committed;
>     } m_state;
> };
> 
>diff --git a/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp b/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp
>index be21680fbd2b191939dae5a0ca5f29f4b69d80d0..5f6048187f35d87525e32e4f1ebec3acb8407395 100644
>--- a/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp
>+++ b/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp
>@@ -30,7 +30,11 @@
> #include "GraphicsContext.h"
> #include "GraphicsLayer.h"
> #include "GraphicsLayerFactory.h"
>+#include "NicosiaBackingStoreTextureMapperImpl.h"
> #include "NicosiaCompositionLayerTextureMapperImpl.h"
>+#include "NicosiaContentLayerTextureMapperImpl.h"
>+#include "NicosiaImageBackingTextureMapperImpl.h"
>+#include "NicosiaPaintingContext.h"
> #include "NicosiaPaintingEngine.h"
> #include "ScrollableArea.h"
> #include "TextureMapperPlatformLayerProxyProvider.h"
>@@ -160,6 +164,8 @@ CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer()
>     }
>     ASSERT(!m_coordinatedImageBacking);
>     ASSERT(!m_mainBackingStore);
>+    ASSERT(!m_nicosia.imageBacking);
>+    ASSERT(!m_nicosia.backingStore);
>     willBeDestroyed();
> }
> 
>@@ -421,8 +427,13 @@ bool GraphicsLayer::supportsContentsTiling()
> void CoordinatedGraphicsLayer::setContentsNeedsDisplay()
> {
> #if USE(COORDINATED_GRAPHICS_THREADED)
>+#if USE(NICOSIA)
>+    if (m_nicosia.contentLayer)
>+        m_shouldUpdatePlatformLayer = true;
>+#else
>     if (m_platformLayer)
>         m_shouldUpdatePlatformLayer = true;
>+#endif
> #endif
> 
>     notifyFlushRequired();
>@@ -433,6 +444,13 @@ void CoordinatedGraphicsLayer::setContentsToPlatformLayer(PlatformLayer* platfor
> {
> #if USE(COORDINATED_GRAPHICS_THREADED)
> #if USE(NICOSIA)
>+    auto* contentLayer = downcast<Nicosia::ContentLayer>(platformLayer);
>+    if (m_nicosia.contentLayer != contentLayer) {
>+        m_shouldSyncPlatformLayer = true;
>+        m_nicosia.delta.contentLayerChanged = true;
>+    }
>+
>+    m_nicosia.contentLayer = contentLayer;
> #else
>     if (m_platformLayer != platformLayer)
>         m_shouldSyncPlatformLayer = true;
>@@ -798,6 +816,69 @@ void CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly()
>     if (!hasActiveTransformAnimation)
>         m_movingVisibleRect = false;
> 
>+    if (m_nicosia.contentLayer)
>+        downcast<Nicosia::ContentLayerTextureMapperImpl>(m_nicosia.contentLayer->impl()).swapBuffersIfNeeded();
>+
>+    if (!shouldHaveBackingStore()) {
>+        if (m_nicosia.backingStore) {
>+            auto& layerState = downcast<Nicosia::BackingStoreTextureMapperImpl>(m_nicosia.backingStore->impl()).layerState();
>+            layerState.isPurging = true;
>+            layerState.mainBackingStore = nullptr;
>+            layerState.previousBackingStore = nullptr;
>+
>+            m_nicosia.backingStore = nullptr;
>+            m_nicosia.delta.backingStoreChanged = true;
>+        }
>+    } else {
>+        if (!m_nicosia.backingStore) {
>+            m_nicosia.backingStore = Nicosia::BackingStore::create(Nicosia::BackingStoreTextureMapperImpl::createFactory());
>+            m_nicosia.delta.backingStoreChanged = true;
>+        }
>+    }
>+
>+    if (m_compositedNativeImagePtr) {
>+        ASSERT(m_compositedImage);
>+        auto& image = *m_compositedImage;
>+        uintptr_t imageID = reinterpret_cast<uintptr_t>(&image);
>+        uintptr_t nativeImageID = reinterpret_cast<uintptr_t>(m_compositedNativeImagePtr.get());
>+
>+        if (m_nicosia.imageBacking) {
>+            auto& impl = downcast<Nicosia::ImageBackingTextureMapperImpl>(m_nicosia.imageBacking->impl());
>+            if (impl.layerState().imageID != imageID) {
>+                impl.layerState().update = Nicosia::ImageBackingTextureMapperImpl::Update { };
>+                m_nicosia.imageBacking = nullptr;
>+            }
>+        }
>+        if (!m_nicosia.imageBacking) {
>+            m_nicosia.imageBacking = Nicosia::ImageBacking::create(Nicosia::ImageBackingTextureMapperImpl::createFactory());
>+            m_nicosia.delta.imageBackingChanged = true;
>+        }
>+
>+        auto& impl = downcast<Nicosia::ImageBackingTextureMapperImpl>(m_nicosia.imageBacking->impl());
>+        auto& layerState = impl.layerState();
>+        layerState.imageID = imageID;
>+        layerState.update.isVisible = transformedVisibleRect().intersects(IntRect(contentsRect()));
>+        if (layerState.update.isVisible && layerState.nativeImageID != nativeImageID) {
>+            auto buffer = Nicosia::Buffer::create(IntSize(image.size()),
>+                !image.currentFrameKnownToBeOpaque() ? Nicosia::Buffer::SupportsAlpha : Nicosia::Buffer::NoFlags);
>+            Nicosia::PaintingContext::paint(buffer,
>+                [&image](GraphicsContext& context)
>+                {
>+                    IntRect rect { { }, IntSize { image.size() } };
>+                    context.drawImage(image, rect, rect, ImagePaintingOptions(CompositeCopy));
>+                });
>+            layerState.nativeImageID = nativeImageID;
>+            layerState.update.buffer = WTFMove(buffer);
>+            m_nicosia.delta.imageBackingChanged = true;
>+        }
>+    } else if (m_nicosia.imageBacking) {
>+        auto& layerState = downcast<Nicosia::ImageBackingTextureMapperImpl>(m_nicosia.imageBacking->impl()).layerState();
>+        layerState.update = Nicosia::ImageBackingTextureMapperImpl::Update { };
>+
>+        m_nicosia.imageBacking = nullptr;
>+        m_nicosia.delta.imageBackingChanged = true;
>+    }
>+
>     {
>         m_nicosia.layer->updateState(
>             [this](Nicosia::CompositionLayer::LayerState& state)
>@@ -867,17 +948,26 @@ void CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly()
>                     state.repaintCounter = m_nicosia.repaintCounter;
>                 if (localDelta.debugBorderChanged)
>                     state.debugBorder = m_nicosia.debugBorder;
>+
>+                if (localDelta.backingStoreChanged)
>+                    state.backingStore = m_nicosia.backingStore;
>+                if (localDelta.contentLayerChanged)
>+                    state.contentLayer = m_nicosia.contentLayer;
>+                if (localDelta.imageBackingChanged)
>+                    state.imageBacking = m_nicosia.imageBacking;
>             });
>+        m_nicosia.performLayerSync = !!m_nicosia.delta.value;
>         m_nicosia.delta = { };
>     }
> }
> 
> void CoordinatedGraphicsLayer::syncPendingStateChangesIncludingSubLayers()
> {
>-    if (m_layerState.hasPendingChanges()) {
>+    if (m_nicosia.performLayerSync || m_layerState.hasPendingChanges()) {
>         m_coordinator->syncLayerState(m_id, m_layerState);
>         resetLayerState();
>     }
>+    m_nicosia.performLayerSync = false;
> 
>     if (maskLayer())
>         downcast<CoordinatedGraphicsLayer>(*maskLayer()).syncPendingStateChangesIncludingSubLayers();
>@@ -923,27 +1013,6 @@ float CoordinatedGraphicsLayer::effectiveContentsScale()
>     return selfOrAncestorHaveNonAffineTransforms() ? 1 : deviceScaleFactor() * pageScaleFactor();
> }
> 
>-void CoordinatedGraphicsLayer::adjustContentsScale()
>-{
>-    ASSERT(shouldHaveBackingStore());
>-    if (!m_mainBackingStore || m_mainBackingStore->contentsScale() == effectiveContentsScale())
>-        return;
>-
>-    // Between creating the new backing store and painting the content,
>-    // we do not want to drop the previous one as that might result in
>-    // briefly seeing flickering as the old tiles may be dropped before
>-    // something replaces them.
>-    m_previousBackingStore = WTFMove(m_mainBackingStore);
>-
>-    // No reason to save the previous backing store for non-visible areas.
>-    m_previousBackingStore->removeAllNonVisibleTiles(transformedVisibleRect(), IntRect(0, 0, size().width(), size().height()));
>-}
>-
>-void CoordinatedGraphicsLayer::createBackingStore()
>-{
>-    m_mainBackingStore = std::make_unique<TiledBackingStore>(*this, effectiveContentsScale());
>-}
>-
> void CoordinatedGraphicsLayer::tiledBackingStoreHasPendingTileCreation()
> {
>     setNeedsVisibleRectAdjustment();
>@@ -1011,12 +1080,12 @@ void CoordinatedGraphicsLayer::removeTile(uint32_t tileID)
> void CoordinatedGraphicsLayer::updateContentBuffersIncludingSubLayers()
> {
>     if (CoordinatedGraphicsLayer* mask = downcast<CoordinatedGraphicsLayer>(maskLayer()))
>-        mask->updateContentBuffers();
>+        mask->updateContentBuffers2();
> 
>     if (CoordinatedGraphicsLayer* replica = downcast<CoordinatedGraphicsLayer>(replicaLayer()))
>-        replica->updateContentBuffers();
>+        replica->updateContentBuffers2();
> 
>-    updateContentBuffers();
>+    updateContentBuffers2();
> 
>     for (auto& child : children())
>         downcast<CoordinatedGraphicsLayer>(*child).updateContentBuffersIncludingSubLayers();
>@@ -1031,14 +1100,22 @@ void CoordinatedGraphicsLayer::updateContentBuffers()
>     }
> 
>     if (m_pendingContentsScaleAdjustment) {
>-        adjustContentsScale();
>+        if (m_mainBackingStore && m_mainBackingStore->contentsScale() != effectiveContentsScale()) {
>+            // Between creating the new backing store and painting the content, we do not
>+            // want to drop the previous one as that might result in briefly seeing flickering
>+            // as the old tiles may be dropped before something replaces them.
>+            m_previousBackingStore = WTFMove(m_mainBackingStore);
>+
>+            // No reason to save the previous backing store for non-visible areas.
>+            m_previousBackingStore->removeAllNonVisibleTiles(transformedVisibleRect(), IntRect(0, 0, size().width(), size().height()));
>+        }
>         m_pendingContentsScaleAdjustment = false;
>     }
> 
>     // This is the only place we (re)create the main tiled backing store, once we
>     // have a remote client and we are ready to send our data to the UI process.
>     if (!m_mainBackingStore) {
>-        createBackingStore();
>+        m_mainBackingStore = std::make_unique<TiledBackingStore>(*this, effectiveContentsScale());
>         m_pendingVisibleRectAdjustment = true;
>     }
> 
>@@ -1100,6 +1177,107 @@ void CoordinatedGraphicsLayer::updateContentBuffers()
>         m_previousBackingStore = nullptr;
> }
> 
>+void CoordinatedGraphicsLayer::updateContentBuffers2()
>+{
>+    if (!m_nicosia.backingStore)
>+        return;
>+
>+    auto& impl = downcast<Nicosia::BackingStoreTextureMapperImpl>(m_nicosia.backingStore->impl());
>+    auto& layerState = impl.layerState();
>+    layerState.isFlushing = true;
>+
>+    auto finishUpdate =
>+        [this, &layerState] {
>+            auto& update = layerState.update;
>+            m_nicosia.performLayerSync = !update.tilesToCreate.isEmpty()
>+                || !update.tilesToRemove.isEmpty() || !update.tilesToUpdate.isEmpty();
>+            layerState.isFlushing = false;
>+        };
>+
>+    if (m_pendingContentsScaleAdjustment) {
>+        if (layerState.mainBackingStore && layerState.mainBackingStore->contentsScale() != effectiveContentsScale()) {
>+            // Between creating the new backing store and painting the content, we do not
>+            // want to drop the previous one as that might result in briefly seeing flickering
>+            // as the old tiles may be dropped before something replaces them.
>+            layerState.previousBackingStore = WTFMove(layerState.mainBackingStore);
>+
>+            // No reason to save the previous backing store for non-visible areas.
>+            layerState.previousBackingStore->removeAllNonVisibleTiles(transformedVisibleRect(), IntRect(0, 0, size().width(), size().height()));
>+        }
>+        m_pendingContentsScaleAdjustment = false;
>+    }
>+
>+    if (!layerState.mainBackingStore) {
>+        layerState.mainBackingStore = std::make_unique<TiledBackingStore>(impl, effectiveContentsScale());
>+        m_pendingVisibleRectAdjustment = true;
>+    }
>+
>+    if (!m_pendingVisibleRectAdjustment && !m_needsDisplay.completeLayer && m_needsDisplay.rects.isEmpty()) {
>+        finishUpdate();
>+        return;
>+    }
>+
>+    if (!m_needsDisplay.completeLayer) {
>+        for (auto& rect : m_needsDisplay.rects)
>+            layerState.mainBackingStore->invalidate(IntRect { rect });
>+    } else
>+        layerState.mainBackingStore->invalidate({ { }, IntSize { m_size } });
>+
>+    m_needsDisplay.completeLayer = false;
>+    m_needsDisplay.rects.clear();
>+
>+    if (m_pendingVisibleRectAdjustment) {
>+        m_pendingVisibleRectAdjustment = false;
>+        layerState.mainBackingStore->createTilesIfNeeded(transformedVisibleRect(), IntRect(0, 0, m_size.width(), m_size.height()));
>+    }
>+
>+    ASSERT(m_coordinator && m_coordinator->isFlushingLayerChanges());
>+
>+    auto dirtyTiles = layerState.mainBackingStore->dirtyTiles();
>+    if (!dirtyTiles.isEmpty()) {
>+        bool didUpdateTiles = false;
>+
>+        for (auto& tileReference : dirtyTiles) {
>+            auto& tile = tileReference.get();
>+            tile.ensureTileID();
>+
>+            auto& tileRect = tile.rect();
>+            auto& dirtyRect = tile.dirtyRect();
>+
>+            auto coordinatedBuffer = Nicosia::Buffer::create(dirtyRect.size(), contentsOpaque() ? Nicosia::Buffer::NoFlags : Nicosia::Buffer::SupportsAlpha);
>+            SurfaceUpdateInfo updateInfo;
>+            updateInfo.updateRect = dirtyRect;
>+            updateInfo.updateRect.move(-tileRect.x(), -tileRect.y());
>+            updateInfo.buffer = coordinatedBuffer.copyRef();
>+
>+            if (!m_coordinator->paintingEngine().paint(*this, WTFMove(coordinatedBuffer),
>+                dirtyRect, layerState.mainBackingStore->mapToContents(dirtyRect),
>+                IntRect { { 0, 0 }, dirtyRect.size() }, layerState.mainBackingStore->contentsScale()))
>+                continue;
>+
>+            impl.updateTile(tile.tileID(), updateInfo, tileRect);
>+
>+            tile.markClean();
>+            didUpdateTiles |= true;
>+        }
>+
>+        if (didUpdateTiles)
>+            didUpdateTileBuffers();
>+    }
>+
>+    // The previous backing store is kept around to avoid flickering between
>+    // removing the existing tiles and painting the new ones. The first time
>+    // the visibleRect is full painted we remove the previous backing store.
>+    if (layerState.previousBackingStore && layerState.mainBackingStore->visibleAreaIsCovered())
>+        layerState.previousBackingStore = nullptr;
>+
>+    if (layerState.hasPendingTileCreation) {
>+        setNeedsVisibleRectAdjustment();
>+        notifyFlushRequired();
>+    }
>+    finishUpdate();
>+}
>+
> void CoordinatedGraphicsLayer::purgeBackingStores()
> {
> #ifndef NDEBUG
>@@ -1107,6 +1285,14 @@ void CoordinatedGraphicsLayer::purgeBackingStores()
> #endif
>     m_mainBackingStore = nullptr;
>     m_previousBackingStore = nullptr;
>+    if (m_nicosia.backingStore) {
>+        auto& layerState = downcast<Nicosia::BackingStoreTextureMapperImpl>(m_nicosia.backingStore->impl()).layerState();
>+        layerState.isPurging = true;
>+        layerState.mainBackingStore = nullptr;
>+        layerState.previousBackingStore = nullptr;
>+
>+        m_nicosia.backingStore = nullptr;
>+    }
> 
>     releaseImageBackingIfNeeded();
> 
>diff --git a/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h b/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h
>index 8b9f9a9227884b887f73e33ac3a7868767800171..391e667f2d676f391d4222c32d9db13d73e2321c 100644
>--- a/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h
>+++ b/Source/WebCore/platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h
>@@ -110,7 +110,7 @@ public:
>     void removeAnimation(const String&) override;
>     void suspendAnimations(MonotonicTime) override;
>     void resumeAnimations() override;
>-    bool usesContentsLayer() const override { return m_platformLayer || m_compositedImage; }
>+    bool usesContentsLayer() const override { return m_platformLayer || m_nicosia.contentLayer || m_compositedImage; }
> 
>     void syncPendingStateChangesIncludingSubLayers();
>     void updateContentBuffersIncludingSubLayers();
>@@ -160,8 +160,8 @@ private:
>     void syncImageBacking();
>     void computeTransformedVisibleRect();
>     void updateContentBuffers();
>+    void updateContentBuffers2();
> 
>-    void createBackingStore();
>     void releaseImageBackingIfNeeded();
> 
>     void notifyFlushRequired();
>@@ -171,7 +171,6 @@ private:
>     bool shouldHaveBackingStore() const;
>     bool selfOrAncestorHasActiveTransformAnimation() const;
>     bool selfOrAncestorHaveNonAffineTransforms();
>-    void adjustContentsScale();
> 
>     void setShouldUpdateVisibleRect();
>     float effectiveContentsScale();
>@@ -231,6 +230,11 @@ private:
>         Nicosia::CompositionLayer::LayerState::Delta delta;
>         Nicosia::CompositionLayer::LayerState::RepaintCounter repaintCounter;
>         Nicosia::CompositionLayer::LayerState::DebugBorder debugBorder;
>+        bool performLayerSync { false };
>+
>+        RefPtr<Nicosia::BackingStore> backingStore;
>+        RefPtr<Nicosia::ContentLayer> contentLayer;
>+        RefPtr<Nicosia::ImageBacking> imageBacking;
>     } m_nicosia;
> };
> 
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>index fea28ea0b06f58fa38d3916081fcaaa1b3728e3c..abc27c4ef32339930be496aea69f5ff2f8ac1718 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>@@ -25,7 +25,12 @@
> #if USE(COORDINATED_GRAPHICS)
> 
> #include <WebCore/CoordinatedBackingStore.h>
>+#include <WebCore/NicosiaBackingStoreTextureMapperImpl.h>
> #include <WebCore/NicosiaBuffer.h>
>+#include <WebCore/NicosiaCompositionLayerTextureMapperImpl.h>
>+#include <WebCore/NicosiaContentLayerTextureMapperImpl.h>
>+#include <WebCore/NicosiaImageBackingTextureMapperImpl.h>
>+#include <WebCore/NicosiaScene.h>
> #include <WebCore/TextureMapper.h>
> #include <WebCore/TextureMapperBackingStore.h>
> #include <WebCore/TextureMapperGL.h>
>@@ -57,20 +62,17 @@ void CoordinatedGraphicsScene::applyStateChanges(const Vector<CoordinatedGraphic
>     ensureRootLayer();
> 
>     for (auto& state : states)
>-        commitSceneState(state);
>+        commitSceneState(state.nicosia);
> }
> 
> void CoordinatedGraphicsScene::paintToCurrentGLContext(const TransformationMatrix& matrix, float opacity, const FloatRect& clipRect, const Color& backgroundColor, bool drawsBackground, TextureMapper::PaintFlags PaintFlags)
> {
>+    updateSceneState();
>+
>     TextureMapperLayer* currentRootLayer = rootLayer();
>     if (!currentRootLayer)
>         return;
> 
>-#if USE(COORDINATED_GRAPHICS_THREADED)
>-    for (auto& proxy : m_platformLayerProxies.values())
>-        proxy->swapBuffer();
>-#endif
>-
>     currentRootLayer->setTextureMapper(m_textureMapper.get());
>     bool sceneHasRunningAnimations = currentRootLayer->applyAnimationsRecursively(MonotonicTime::now());
>     m_textureMapper->beginPainting(PaintFlags);
>@@ -104,23 +106,6 @@ void CoordinatedGraphicsScene::updateViewport()
>         m_client->updateViewport();
> }
> 
>-void CoordinatedGraphicsScene::syncPlatformLayerIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state)
>-{
>-#if USE(COORDINATED_GRAPHICS_THREADED)
>-    if (!state.platformLayerChanged)
>-        return;
>-
>-    if (state.platformLayerProxy) {
>-        m_platformLayerProxies.set(layer, state.platformLayerProxy);
>-        state.platformLayerProxy->activateOnCompositingThread(this, layer);
>-    } else
>-        m_platformLayerProxies.remove(layer);
>-#else
>-    UNUSED_PARAM(layer);
>-    UNUSED_PARAM(state);
>-#endif
>-}
>-
> #if USE(COORDINATED_GRAPHICS_THREADED)
> void CoordinatedGraphicsScene::onNewBufferAvailable()
> {
>@@ -128,320 +113,290 @@ void CoordinatedGraphicsScene::onNewBufferAvailable()
> }
> #endif
> 
>-void CoordinatedGraphicsScene::setLayerChildrenIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state)
>+Nicosia::CompositionLayerTextureMapperImpl& compositionLayerImpl(Nicosia::CompositionLayer& compositionLayer)
> {
>-    if (!state.childrenChanged)
>-        return;
>-
>-    Vector<TextureMapperLayer*> children;
>-    children.reserveCapacity(state.children.size());
>-    for (auto& child : state.children)
>-        children.append(layerByID(child));
>-
>-    layer->setChildren(children);
>+    return downcast<Nicosia::CompositionLayerTextureMapperImpl>(compositionLayer.impl());
> }
> 
>-void CoordinatedGraphicsScene::setLayerFiltersIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state)
>+Nicosia::ContentLayerTextureMapperImpl& contentLayerImpl(Nicosia::ContentLayer& contentLayer)
> {
>-    if (!state.filtersChanged)
>-        return;
>-
>-    layer->setFilters(state.filters);
>+    return downcast<Nicosia::ContentLayerTextureMapperImpl>(contentLayer.impl());
> }
> 
>-void CoordinatedGraphicsScene::setLayerState(CoordinatedLayerID id, const CoordinatedGraphicsLayerState& layerState, CommitScope& commitScope)
>+Nicosia::BackingStoreTextureMapperImpl& backingStoreImpl(Nicosia::BackingStore& backingStore)
> {
>-    ASSERT(m_rootLayerID != InvalidCoordinatedLayerID);
>-    TextureMapperLayer* layer = layerByID(id);
>-
>-    if (layerState.positionChanged)
>-        layer->setPosition(layerState.pos);
>-
>-    if (layerState.anchorPointChanged)
>-        layer->setAnchorPoint(layerState.anchorPoint);
>-
>-    if (layerState.sizeChanged)
>-        layer->setSize(layerState.size);
>-
>-    if (layerState.transformChanged)
>-        layer->setTransform(layerState.transform);
>-
>-    if (layerState.childrenTransformChanged)
>-        layer->setChildrenTransform(layerState.childrenTransform);
>-
>-    if (layerState.contentsRectChanged)
>-        layer->setContentsRect(layerState.contentsRect);
>-
>-    if (layerState.contentsTilingChanged) {
>-        layer->setContentsTilePhase(layerState.contentsTilePhase);
>-        layer->setContentsTileSize(layerState.contentsTileSize);
>-    }
>-
>-    if (layerState.opacityChanged)
>-        layer->setOpacity(layerState.opacity);
>-
>-    if (layerState.solidColorChanged)
>-        layer->setSolidColor(layerState.solidColor);
>-
>-    if (layerState.debugVisualsChanged)
>-        layer->setDebugVisuals(layerState.debugVisuals.showDebugBorders, layerState.debugVisuals.debugBorderColor, layerState.debugVisuals.debugBorderWidth);
>-    if (layerState.repaintCountChanged)
>-        layer->setRepaintCounter(layerState.repaintCount.showRepaintCounter, layerState.repaintCount.count);
>-
>-    if (layerState.replicaChanged)
>-        layer->setReplicaLayer(getLayerByIDIfExists(layerState.replica));
>-
>-    if (layerState.maskChanged)
>-        layer->setMaskLayer(getLayerByIDIfExists(layerState.mask));
>-
>-    if (layerState.imageChanged)
>-        assignImageBackingToLayer(layer, layerState.imageID);
>-
>-    if (layerState.flagsChanged) {
>-        layer->setContentsOpaque(layerState.contentsOpaque);
>-        layer->setDrawsContent(layerState.drawsContent);
>-        layer->setContentsVisible(layerState.contentsVisible);
>-        layer->setBackfaceVisibility(layerState.backfaceVisible);
>-
>-        // Never clip the root layer.
>-        layer->setMasksToBounds(id == m_rootLayerID ? false : layerState.masksToBounds);
>-        layer->setPreserves3D(layerState.preserves3D);
>-    }
>-
>-    // Apply Operations.
>-    setLayerChildrenIfNeeded(layer, layerState);
>-    setLayerFiltersIfNeeded(layer, layerState);
>-    setLayerAnimationsIfNeeded(layer, layerState);
>-    prepareContentBackingStore(layer, commitScope);
>-    createTilesIfNeeded(layer, layerState);
>-    removeTilesIfNeeded(layer, layerState, commitScope);
>-    updateTilesIfNeeded(layer, layerState, commitScope);
>-    syncPlatformLayerIfNeeded(layer, layerState);
>+    return downcast<Nicosia::BackingStoreTextureMapperImpl>(backingStore.impl());
> }
> 
>-TextureMapperLayer* CoordinatedGraphicsScene::getLayerByIDIfExists(CoordinatedLayerID id)
>+Nicosia::ImageBackingTextureMapperImpl& imageBackingImpl(Nicosia::ImageBacking& imageBacking)
> {
>-    return (id != InvalidCoordinatedLayerID) ? layerByID(id) : 0;
>+    return downcast<Nicosia::ImageBackingTextureMapperImpl>(imageBacking.impl());
> }
> 
>-void CoordinatedGraphicsScene::createLayers(const Vector<CoordinatedLayerID>& layerIDs)
>+TextureMapperLayer& texmapLayer(Nicosia::CompositionLayer& compositionLayer)
> {
>-    for (auto& layerID : layerIDs)
>-        createLayer(layerID);
>-}
>-
>-void CoordinatedGraphicsScene::createLayer(CoordinatedLayerID id)
>-{
>-    std::unique_ptr<TextureMapperLayer> newLayer = std::make_unique<TextureMapperLayer>();
>-    newLayer->setID(id);
>-    m_layers.add(id, WTFMove(newLayer));
>-}
>-
>-void CoordinatedGraphicsScene::deleteLayers(const Vector<CoordinatedLayerID>& layerIDs)
>-{
>-    for (auto& layerID : layerIDs)
>-        deleteLayer(layerID);
>+    auto& compositionState = compositionLayerImpl(compositionLayer).compositionState();
>+    if (!compositionState.layer) {
>+        compositionState.layer = std::make_unique<TextureMapperLayer>();
>+        compositionState.layer->setID(compositionLayer.id());
>+    }
>+    return *compositionState.layer;
> }
> 
>-void CoordinatedGraphicsScene::deleteLayer(CoordinatedLayerID layerID)
>+void updateBackingStore(TextureMapperLayer& layer,
>+    Nicosia::BackingStoreTextureMapperImpl::CompositionState& compositionState,
>+    const Nicosia::BackingStoreTextureMapperImpl::TileUpdate& update)
> {
>-    std::unique_ptr<TextureMapperLayer> layer = m_layers.take(layerID);
>-    ASSERT(layer);
>-
>-    m_backingStores.remove(layer.get());
>-#if USE(COORDINATED_GRAPHICS_THREADED)
>-    if (auto platformLayerProxy = m_platformLayerProxies.take(layer.get()))
>-        platformLayerProxy->invalidate();
>-#endif
>-}
>+    if (!layerShouldHaveBackingStore(&layer)) {
>+        layer.setBackingStore(nullptr);
>+        compositionState.backingStore = nullptr;
>+        return;
>+    }
> 
>-void CoordinatedGraphicsScene::setRootLayerID(CoordinatedLayerID layerID)
>-{
>-    ASSERT(layerID != InvalidCoordinatedLayerID);
>-    ASSERT(m_rootLayerID == InvalidCoordinatedLayerID);
>+    if (!compositionState.backingStore)
>+        compositionState.backingStore = CoordinatedBackingStore::create();
>+    auto& backingStore = *compositionState.backingStore;
> 
>-    m_rootLayerID = layerID;
>+    layer.setBackingStore(&backingStore);
>+    backingStore.setSize(layer.size());
> 
>-    TextureMapperLayer* layer = layerByID(layerID);
>-    ASSERT(m_rootLayer->children().isEmpty());
>-    m_rootLayer->addChild(layer);
>+    for (auto& tile : update.tilesToCreate)
>+        backingStore.createTile(tile.tileID, tile.scale);
>+    for (auto& tile : update.tilesToRemove)
>+        backingStore.removeTile(tile.tileID);
>+    for (auto& tile : update.tilesToUpdate) {
>+        backingStore.updateTile(tile.tileID, tile.updateInfo.updateRect,
>+            tile.tileRect, tile.updateInfo.buffer.copyRef(), { 0, 0 });
>+    }
> }
> 
>-void CoordinatedGraphicsScene::prepareContentBackingStore(TextureMapperLayer* layer, CommitScope& commitScope)
>+void updateImageBacking(TextureMapperLayer& layer,
>+    Nicosia::ImageBackingTextureMapperImpl::CompositionState& compositionState,
>+    Nicosia::ImageBackingTextureMapperImpl::Update& update)
> {
>-    if (!layerShouldHaveBackingStore(layer)) {
>-        removeBackingStoreIfNeeded(layer);
>+    if (!update.isVisible) {
>+        layer.setBackingStore(nullptr);
>         return;
>     }
> 
>-    createBackingStoreIfNeeded(layer);
>-    resetBackingStoreSizeToLayerSize(layer, commitScope);
>-}
>+    if (!compositionState.backingStore)
>+        compositionState.backingStore = CoordinatedBackingStore::create();
>+    auto& backingStore = *compositionState.backingStore;
>+    layer.setContentsLayer(&backingStore);
> 
>-void CoordinatedGraphicsScene::createBackingStoreIfNeeded(TextureMapperLayer* layer)
>-{
>-    if (m_backingStores.contains(layer))
>+    if (!update.buffer)
>         return;
> 
>-    auto backingStore = CoordinatedBackingStore::create();
>-    m_backingStores.add(layer, backingStore.copyRef());
>-    layer->setBackingStore(backingStore.ptr());
>-}
>-
>-void CoordinatedGraphicsScene::removeBackingStoreIfNeeded(TextureMapperLayer* layer)
>-{
>-    RefPtr<CoordinatedBackingStore> backingStore = m_backingStores.take(layer);
>-    if (!backingStore)
>-        return;
>-
>-    layer->setBackingStore(nullptr);
>+    backingStore.createTile(1, 1.0);
>+    WebCore::IntRect rect { { }, update.buffer->size() };
>+    ASSERT(2000 >= std::max(rect.width(), rect.height()));
>+    backingStore.setSize(rect.size());
>+    backingStore.updateTile(1, rect, rect, WTFMove(update.buffer), rect.location());
> }
> 
>-void CoordinatedGraphicsScene::resetBackingStoreSizeToLayerSize(TextureMapperLayer* layer, CommitScope& commitScope)
>+void removeLayer(Nicosia::CompositionLayer& layer)
> {
>-    RefPtr<CoordinatedBackingStore> backingStore = m_backingStores.get(layer);
>-    ASSERT(backingStore);
>-    backingStore->setSize(layer->size());
>-    commitScope.backingStoresWithPendingBuffers.add(backingStore);
>-}
>+    layer.accessCommitted(
>+        [](const Nicosia::CompositionLayer::LayerState& committed)
>+        {
>+            if (committed.contentLayer)
>+                contentLayerImpl(*committed.contentLayer).proxy().invalidate();
> 
>-void CoordinatedGraphicsScene::createTilesIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state)
>-{
>-    if (state.tilesToCreate.isEmpty())
>-        return;
>+            if (committed.backingStore) {
>+                auto& compositionState = backingStoreImpl(*committed.backingStore).compositionState();
>+                compositionState.backingStore = nullptr;
>+            }
> 
>-    RefPtr<CoordinatedBackingStore> backingStore = m_backingStores.get(layer);
>-    ASSERT(backingStore || !layerShouldHaveBackingStore(layer));
>-    if (!backingStore)
>-        return;
>+            if (committed.imageBacking) {
>+                auto& compositionState = imageBackingImpl(*committed.imageBacking).compositionState();
>+                compositionState.backingStore = nullptr;
>+            }
>+        });
> 
>-    for (auto& tile : state.tilesToCreate)
>-        backingStore->createTile(tile.tileID, tile.scale);
>+    auto& compositionState = compositionLayerImpl(layer).compositionState();
>+    compositionState.layer = nullptr;
> }
> 
>-void CoordinatedGraphicsScene::removeTilesIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state, CommitScope& commitScope)
>+void CoordinatedGraphicsScene::commitSceneState(const CoordinatedGraphicsState::NicosiaState& state)
> {
>-    if (state.tilesToRemove.isEmpty())
>-        return;
>-
>-    RefPtr<CoordinatedBackingStore> backingStore = m_backingStores.get(layer);
>-    if (!backingStore)
>+    if (!m_client)
>         return;
> 
>-    for (auto& tile : state.tilesToRemove)
>-        backingStore->removeTile(tile);
>-
>-    commitScope.backingStoresWithPendingBuffers.add(backingStore);
>+    m_nicosia.scene = state.scene;
> }
> 
>-void CoordinatedGraphicsScene::updateTilesIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state, CommitScope& commitScope)
>+void CoordinatedGraphicsScene::updateSceneState()
> {
>-    if (state.tilesToUpdate.isEmpty())
>+    if (!m_nicosia.scene)
>         return;
> 
>-    RefPtr<CoordinatedBackingStore> backingStore = m_backingStores.get(layer);
>-    ASSERT(backingStore || !layerShouldHaveBackingStore(layer));
>-    if (!backingStore)
>-        return;
>-
>-    for (auto& tile : state.tilesToUpdate) {
>-        const SurfaceUpdateInfo& surfaceUpdateInfo = tile.updateInfo;
>-
>-        backingStore->updateTile(tile.tileID, surfaceUpdateInfo.updateRect, tile.tileRect, surfaceUpdateInfo.buffer.copyRef(), { 0, 0 });
>-        commitScope.backingStoresWithPendingBuffers.add(backingStore);
>+    struct {
>+        struct BackingStore {
>+            std::reference_wrapper<TextureMapperLayer> layer;
>+            std::reference_wrapper<Nicosia::BackingStoreTextureMapperImpl> backingStore;
>+            Nicosia::BackingStoreTextureMapperImpl::TileUpdate update;
>+        };
>+        Vector<BackingStore> backingStore;
>+
>+        struct ContentLayer {
>+            std::reference_wrapper<TextureMapperLayer> layer;
>+            std::reference_wrapper<TextureMapperPlatformLayerProxy> proxy;
>+            bool needsActivation { false };
>+        };
>+        Vector<ContentLayer> contentLayer;
>+
>+        struct ImageBacking {
>+            std::reference_wrapper<TextureMapperLayer> layer;
>+            std::reference_wrapper<Nicosia::ImageBackingTextureMapperImpl> imageBacking;
>+            Nicosia::ImageBackingTextureMapperImpl::Update update;
>+        };
>+        Vector<ImageBacking> imageBacking;
>+    } layersByBacking;
>+
>+    m_nicosia.scene->accessState(
>+        [this, &layersByBacking](Nicosia::Scene::State& state)
>+        {
>+            if (state.id == m_nicosia.state.id)
>+                return;
>+
>+            {
>+                auto& rootLayer = texmapLayer(*state.rootLayer);
>+                if (rootLayer.id() != m_rootLayerID) {
>+                    m_rootLayerID = rootLayer.id();
>+                    RELEASE_ASSERT(m_rootLayer->children().isEmpty());
>+                    m_rootLayer->addChild(&rootLayer);
>+                }
>+            }
>+
>+            HashSet<RefPtr<Nicosia::CompositionLayer>> removedLayers;
>+            for (auto& layer : m_nicosia.state.layers) {
>+                if (!state.layers.contains(layer))
>+                    removedLayers.add(layer);
>+            }
>+
>+            m_nicosia.state = state;
>+
>+            for (auto& layer : removedLayers)
>+                removeLayer(*layer);
>+
>+            for (auto& compositionLayer : m_nicosia.state.layers) {
>+                auto& layer = texmapLayer(*compositionLayer);
>+                compositionLayer->commitState(
>+                    [this, &layer, &compositionLayer, &layersByBacking]
>+                    (const Nicosia::CompositionLayer::LayerState& layerState)
>+                    {
>+                        if (layerState.delta.positionChanged)
>+                            layer.setPosition(layerState.position);
>+                        if (layerState.delta.anchorPointChanged)
>+                            layer.setAnchorPoint(layerState.anchorPoint);
>+                        if (layerState.delta.sizeChanged)
>+                            layer.setSize(layerState.size);
>+
>+                        if (layerState.delta.transformChanged)
>+                            layer.setTransform(layerState.transform);
>+                        if (layerState.delta.childrenTransformChanged)
>+                            layer.setChildrenTransform(layerState.childrenTransform);
>+
>+                        if (layerState.delta.contentsRectChanged)
>+                            layer.setContentsRect(layerState.contentsRect);
>+                        if (layerState.delta.contentsTilingChanged) {
>+                            layer.setContentsTilePhase(layerState.contentsTilePhase);
>+                            layer.setContentsTileSize(layerState.contentsTileSize);
>+                        }
>+
>+                        if (layerState.delta.opacityChanged)
>+                            layer.setOpacity(layerState.opacity);
>+                        if (layerState.delta.solidColorChanged)
>+                            layer.setSolidColor(layerState.solidColor);
>+
>+                        if (layerState.delta.filtersChanged)
>+                            layer.setFilters(layerState.filters);
>+                        if (layerState.delta.animationsChanged)
>+                            layer.setAnimations(layerState.animations);
>+
>+                        if (layerState.delta.childrenChanged) {
>+                            layer.setChildren(WTF::map(layerState.children,
>+                                [](auto& child) { return &texmapLayer(*child); }));
>+                        }
>+
>+                        if (layerState.delta.maskChanged)
>+                            layer.setMaskLayer(layerState.mask ? &texmapLayer(*layerState.mask) : nullptr);
>+                        if (layerState.delta.replicaChanged)
>+                            layer.setReplicaLayer(layerState.replica ? &texmapLayer(*layerState.replica) : nullptr);
>+
>+                        if (layerState.delta.flagsChanged) {
>+                            layer.setContentsOpaque(layerState.flags.contentsOpaque);
>+                            layer.setDrawsContent(layerState.flags.drawsContent);
>+                            layer.setContentsVisible(layerState.flags.contentsVisible);
>+                            layer.setBackfaceVisibility(layerState.flags.backfaceVisible);
>+                            layer.setMasksToBounds(layerState.flags.masksToBounds);
>+                            layer.setPreserves3D(layerState.flags.preserves3D);
>+                        }
>+
>+                        if (layerState.backingStore) {
>+                            auto& impl = backingStoreImpl(*layerState.backingStore);
>+                            layersByBacking.backingStore.append(
>+                                { std::ref(layer), std::ref(impl), impl.takeUpdate() });
>+                        } else
>+                            layer.setBackingStore(nullptr);
>+
>+                        if (layerState.contentLayer) {
>+                            auto& impl = contentLayerImpl(*layerState.contentLayer);
>+                            layersByBacking.contentLayer.append(
>+                                { std::ref(layer), std::ref(impl.proxy()), layerState.delta.contentLayerChanged });
>+                        } else if (layerState.imageBacking) {
>+                            auto& impl = imageBackingImpl(*layerState.imageBacking);
>+                            layersByBacking.imageBacking.append(
>+                                { std::ref(layer), std::ref(impl), impl.takeUpdate() });
>+                        } else
>+                            layer.setContentsLayer(nullptr);
>+                    });
>+            }
>+        });
>+
>+    HashSet<Ref<WebCore::CoordinatedBackingStore>> backingStoresWithPendingBuffers;
>+    HashSet<Ref<WebCore::TextureMapperPlatformLayerProxy>> proxiesForSwapping;
>+
>+    {
>+        for (auto& entry : layersByBacking.backingStore) {
>+            auto& compositionState = entry.backingStore.get().compositionState();
>+            updateBackingStore(entry.layer.get(), compositionState, entry.update);
>+
>+            if (compositionState.backingStore)
>+                backingStoresWithPendingBuffers.add(makeRef(*compositionState.backingStore));
>+        }
>+
>+        layersByBacking.backingStore = { };
>     }
>-}
>-
>-void CoordinatedGraphicsScene::syncImageBackings(const CoordinatedGraphicsState& state, CommitScope& commitScope)
>-{
>-    for (auto& image : state.imagesToRemove)
>-        removeImageBacking(image, commitScope);
>-
>-    for (auto& image : state.imagesToCreate)
>-        createImageBacking(image);
>-
>-    for (auto& image : state.imagesToUpdate)
>-        updateImageBacking(image.first, image.second.copyRef(), commitScope);
>-
>-    for (auto& image : state.imagesToClear)
>-        clearImageBackingContents(image, commitScope);
>-}
>-
>-void CoordinatedGraphicsScene::createImageBacking(CoordinatedImageBackingID imageID)
>-{
>-    ASSERT(!m_imageBackings.contains(imageID));
>-    m_imageBackings.add(imageID, CoordinatedBackingStore::create());
>-}
>-
>-void CoordinatedGraphicsScene::updateImageBacking(CoordinatedImageBackingID imageID, RefPtr<Nicosia::Buffer>&& buffer, CommitScope& commitScope)
>-{
>-    ASSERT(m_imageBackings.contains(imageID));
>-    auto it = m_imageBackings.find(imageID);
>-    RefPtr<CoordinatedBackingStore> backingStore = it->value;
>-
>-    // CoordinatedImageBacking is realized to CoordinatedBackingStore with only one tile in UI Process.
>-    backingStore->createTile(1 /* id */, 1 /* scale */);
>-    IntRect rect(IntPoint::zero(), buffer->size());
>-    // See CoordinatedGraphicsLayer::shouldDirectlyCompositeImage()
>-    ASSERT(2000 >= std::max(rect.width(), rect.height()));
>-    backingStore->setSize(rect.size());
>-    backingStore->updateTile(1 /* id */, rect, rect, WTFMove(buffer), rect.location());
>-
>-    commitScope.backingStoresWithPendingBuffers.add(backingStore);
>-}
> 
>-void CoordinatedGraphicsScene::clearImageBackingContents(CoordinatedImageBackingID imageID, CommitScope& commitScope)
>-{
>-    ASSERT(m_imageBackings.contains(imageID));
>-    auto it = m_imageBackings.find(imageID);
>-    RefPtr<CoordinatedBackingStore> backingStore = it->value;
>-    backingStore->removeAllTiles();
>-    commitScope.backingStoresWithPendingBuffers.add(backingStore);
>-}
>-
>-void CoordinatedGraphicsScene::removeImageBacking(CoordinatedImageBackingID imageID, CommitScope& commitScope)
>-{
>-    ASSERT(m_imageBackings.contains(imageID));
>+    {
>+        for (auto& entry : layersByBacking.contentLayer) {
>+            auto& proxy = entry.proxy.get();
>+            if (entry.needsActivation)
>+                proxy.activateOnCompositingThread(this, &entry.layer.get());
>+            proxiesForSwapping.add(makeRef(proxy));
>+        }
> 
>-    // We don't want TextureMapperLayer refers a dangling pointer.
>-    commitScope.releasedImageBackings.append(m_imageBackings.take(imageID));
>-}
>-
>-void CoordinatedGraphicsScene::assignImageBackingToLayer(TextureMapperLayer* layer, CoordinatedImageBackingID imageID)
>-{
>-    if (imageID == InvalidCoordinatedImageBackingID) {
>-        layer->setContentsLayer(0);
>-        return;
>+        layersByBacking.contentLayer = { };
>     }
> 
>-    auto it = m_imageBackings.find(imageID);
>-    ASSERT(it != m_imageBackings.end());
>-    layer->setContentsLayer(it->value.get());
>-}
>-
>-void CoordinatedGraphicsScene::commitSceneState(const CoordinatedGraphicsState& state)
>-{
>-    if (!m_client)
>-        return;
>-
>-    m_nicosia = state.nicosia;
>-    // FIXME: Start using the Nicosia layer state for updates.
>+    {
>+        for (auto& entry : layersByBacking.imageBacking) {
>+            auto& compositionState = entry.imageBacking.get().compositionState();
>+            updateImageBacking(entry.layer.get(), compositionState, entry.update);
> 
>-    CommitScope commitScope;
>+            if (compositionState.backingStore)
>+                backingStoresWithPendingBuffers.add(makeRef(*compositionState.backingStore));
>+        }
> 
>-    createLayers(state.layersToCreate);
>-    deleteLayers(state.layersToRemove);
>-
>-    if (state.rootCompositingLayer != m_rootLayerID)
>-        setRootLayerID(state.rootCompositingLayer);
>-
>-    syncImageBackings(state, commitScope);
>-
>-    for (auto& layer : state.layersToUpdate)
>-        setLayerState(layer.first, layer.second, commitScope);
>+        layersByBacking.imageBacking = { };
>+    }
> 
>-    for (auto& backingStore : commitScope.backingStoresWithPendingBuffers)
>+    for (auto& backingStore : backingStoresWithPendingBuffers)
>         backingStore->commitTileOperations(*m_textureMapper);
>+
>+    for (auto& proxy : proxiesForSwapping)
>+        proxy->swapBuffer();
> }
> 
> void CoordinatedGraphicsScene::ensureRootLayer()
>@@ -465,26 +420,22 @@ void CoordinatedGraphicsScene::purgeGLResources()
> {
>     ASSERT(!m_client);
> 
>-    m_imageBackings.clear();
>-#if USE(COORDINATED_GRAPHICS_THREADED)
>-    for (auto& proxy : m_platformLayerProxies.values())
>-        proxy->invalidate();
>-    m_platformLayerProxies.clear();
>-#endif
>+    if (m_nicosia.scene) {
>+        m_nicosia.scene->accessState(
>+            [this](const Nicosia::Scene::State& state)
>+            {
>+                ASSERT(state.id == m_nicosia.state.id);
>+                for (auto& layer : m_nicosia.state.layers)
>+                    removeLayer(*layer);
>+                m_nicosia.state.layers = { };
>+                m_nicosia.state.rootLayer = nullptr;
>+            });
>+        m_nicosia.scene = nullptr;
>+    }
> 
>     m_rootLayer = nullptr;
>     m_rootLayerID = InvalidCoordinatedLayerID;
>-    m_layers.clear();
>     m_textureMapper = nullptr;
>-    m_backingStores.clear();
>-}
>-
>-void CoordinatedGraphicsScene::setLayerAnimationsIfNeeded(TextureMapperLayer* layer, const CoordinatedGraphicsLayerState& state)
>-{
>-    if (!state.animationsChanged)
>-        return;
>-
>-    layer->setAnimations(state.animations);
> }
> 
> void CoordinatedGraphicsScene::detach()
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>index 2f3b4f339753fdc7ddcb711020396002a1a92afb..40b8b63110e99fb24e30749bceaa029cf0f3b98e 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>@@ -81,83 +81,36 @@ public:
>     bool isActive() const { return m_isActive; }
>     void setActive(bool active) { m_isActive = active; }
> 
>-    void commitSceneState(const WebCore::CoordinatedGraphicsState&);
>-
>     void setViewBackgroundColor(const WebCore::Color& color) { m_viewBackgroundColor = color; }
>     WebCore::Color viewBackgroundColor() const { return m_viewBackgroundColor; }
> 
> private:
>-    struct CommitScope {
>-        CommitScope() = default;
>-        CommitScope(CommitScope&) = delete;
>-        CommitScope& operator=(const CommitScope&) = delete;
>-
>-        Vector<RefPtr<WebCore::CoordinatedBackingStore>> releasedImageBackings;
>-        HashSet<RefPtr<WebCore::CoordinatedBackingStore>> backingStoresWithPendingBuffers;
>-    };
>-
>-    void setRootLayerID(WebCore::CoordinatedLayerID);
>-    void createLayers(const Vector<WebCore::CoordinatedLayerID>&);
>-    void deleteLayers(const Vector<WebCore::CoordinatedLayerID>&);
>-    void setLayerState(WebCore::CoordinatedLayerID, const WebCore::CoordinatedGraphicsLayerState&, CommitScope&);
>-    void setLayerChildrenIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&);
>-    void updateTilesIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&, CommitScope&);
>-    void createTilesIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&);
>-    void removeTilesIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&, CommitScope&);
>-    void setLayerFiltersIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&);
>-    void setLayerAnimationsIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&);
>-    void syncPlatformLayerIfNeeded(WebCore::TextureMapperLayer*, const WebCore::CoordinatedGraphicsLayerState&);
>-
>-    void syncImageBackings(const WebCore::CoordinatedGraphicsState&, CommitScope&);
>-    void createImageBacking(WebCore::CoordinatedImageBackingID);
>-    void updateImageBacking(WebCore::CoordinatedImageBackingID, RefPtr<Nicosia::Buffer>&&, CommitScope&);
>-    void clearImageBackingContents(WebCore::CoordinatedImageBackingID, CommitScope&);
>-    void removeImageBacking(WebCore::CoordinatedImageBackingID, CommitScope&);
>-
>-    WebCore::TextureMapperLayer* layerByID(WebCore::CoordinatedLayerID id)
>-    {
>-        ASSERT(m_layers.contains(id));
>-        ASSERT(id != WebCore::InvalidCoordinatedLayerID);
>-        return m_layers.get(id);
>-    }
>-    WebCore::TextureMapperLayer* getLayerByIDIfExists(WebCore::CoordinatedLayerID);
>+    void commitSceneState(const WebCore::CoordinatedGraphicsState::NicosiaState&);
>+    void updateSceneState();
>+
>     WebCore::TextureMapperLayer* rootLayer() { return m_rootLayer.get(); }
> 
>     void updateViewport();
> 
>-    void createLayer(WebCore::CoordinatedLayerID);
>-    void deleteLayer(WebCore::CoordinatedLayerID);
>-
>-    void assignImageBackingToLayer(WebCore::TextureMapperLayer*, WebCore::CoordinatedImageBackingID);
>     void ensureRootLayer();
> 
>-    void prepareContentBackingStore(WebCore::TextureMapperLayer*, CommitScope&);
>-    void createBackingStoreIfNeeded(WebCore::TextureMapperLayer*);
>-    void removeBackingStoreIfNeeded(WebCore::TextureMapperLayer*);
>-    void resetBackingStoreSizeToLayerSize(WebCore::TextureMapperLayer*, CommitScope&);
>-
> #if USE(COORDINATED_GRAPHICS_THREADED)
>     void onNewBufferAvailable() override;
> #endif
> 
>-    WebCore::CoordinatedGraphicsState::NicosiaState m_nicosia;
>+    struct {
>+        RefPtr<Nicosia::Scene> scene;
>+        Nicosia::Scene::State state;
>+    } m_nicosia;
> 
>     std::unique_ptr<WebCore::TextureMapper> m_textureMapper;
> 
>-    HashMap<WebCore::CoordinatedImageBackingID, RefPtr<WebCore::CoordinatedBackingStore>> m_imageBackings;
>-    HashMap<WebCore::TextureMapperLayer*, RefPtr<WebCore::CoordinatedBackingStore>> m_backingStores;
>-
>-#if USE(COORDINATED_GRAPHICS_THREADED)
>-    HashMap<WebCore::TextureMapperLayer*, RefPtr<WebCore::TextureMapperPlatformLayerProxy>> m_platformLayerProxies;
>-#endif
>-
>     // Below two members are accessed by only the main thread. The painting thread must lock the main thread to access both members.
>     CoordinatedGraphicsSceneClient* m_client;
>     bool m_isActive { false };
> 
>     std::unique_ptr<WebCore::TextureMapperLayer> m_rootLayer;
> 
>-    HashMap<WebCore::CoordinatedLayerID, std::unique_ptr<WebCore::TextureMapperLayer>> m_layers;
>     WebCore::CoordinatedLayerID m_rootLayerID { WebCore::InvalidCoordinatedLayerID };
>     WebCore::Color m_viewBackgroundColor { WebCore::Color::white };
> 
>diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp
>index 4ec0f5ea1a318c18c8ade2cd9b82c3fd75bfb7b2..794204f65b6953ce723f6bb023a4bdfbaedf4d24 100644
>--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CompositingCoordinator.cpp
>@@ -35,6 +35,8 @@
> #include <WebCore/FrameView.h>
> #include <WebCore/GraphicsContext.h>
> #include <WebCore/InspectorController.h>
>+#include <WebCore/NicosiaBackingStoreTextureMapperImpl.h>
>+#include <WebCore/NicosiaImageBackingTextureMapperImpl.h>
> #include <WebCore/NicosiaPaintingEngine.h>
> #include <WebCore/Page.h>
> #include <wtf/MemoryPressureHandler.h>
>@@ -130,6 +132,22 @@ bool CompositingCoordinator::flushPendingLayerChanges()
>         m_state.nicosia.scene->accessState(
>             [this](Nicosia::Scene::State& state)
>             {
>+                for (auto& compositionLayer : m_nicosia.state.layers) {
>+                    compositionLayer->flushState(
>+                        [](const Nicosia::CompositionLayer::LayerState& state)
>+                        {
>+                            if (state.backingStore) {
>+                                auto& impl = downcast<Nicosia::BackingStoreTextureMapperImpl>(state.backingStore->impl());
>+                                impl.flushUpdate();
>+                            }
>+
>+                            if (state.imageBacking) {
>+                                auto& impl = downcast<Nicosia::ImageBackingTextureMapperImpl>(state.imageBacking->impl());
>+                                impl.flushUpdate();
>+                            }
>+                        });
>+                }
>+
>                 ++state.id;
>                 state.layers = m_nicosia.state.layers;
>                 state.rootLayer = m_nicosia.state.rootLayer;
>diff --git a/Source/cmake/OptionsGTK.cmake b/Source/cmake/OptionsGTK.cmake
>index 945dedec22eff04197728abd5a6e501a950d507f..452451084ebb154583376c2358b49ab9b29a8a67 100644
>--- a/Source/cmake/OptionsGTK.cmake
>+++ b/Source/cmake/OptionsGTK.cmake
>@@ -277,6 +277,7 @@ if (ENABLE_OPENGL)
> 
>     SET_AND_EXPOSE_TO_BUILD(USE_COORDINATED_GRAPHICS TRUE)
>     SET_AND_EXPOSE_TO_BUILD(USE_COORDINATED_GRAPHICS_THREADED TRUE)
>+    SET_AND_EXPOSE_TO_BUILD(USE_NICOSIA TRUE)
> endif ()
> 
> if (ENABLE_PLUGIN_PROCESS_GTK2)
>diff --git a/Source/cmake/OptionsWPE.cmake b/Source/cmake/OptionsWPE.cmake
>index e87011d52d6e8c7c312ce7ec936ce7c2ad48970c..fcb59d8808e22beb6678a48b27fd5803905392f9 100644
>--- a/Source/cmake/OptionsWPE.cmake
>+++ b/Source/cmake/OptionsWPE.cmake
>@@ -134,6 +134,7 @@ SET_AND_EXPOSE_TO_BUILD(USE_TEXTURE_MAPPER_GL TRUE)
> SET_AND_EXPOSE_TO_BUILD(USE_TILED_BACKING_STORE TRUE)
> SET_AND_EXPOSE_TO_BUILD(USE_COORDINATED_GRAPHICS TRUE)
> SET_AND_EXPOSE_TO_BUILD(USE_COORDINATED_GRAPHICS_THREADED TRUE)
>+SET_AND_EXPOSE_TO_BUILD(USE_NICOSIA TRUE)
> 
> set(FORWARDING_HEADERS_DIR ${DERIVED_SOURCES_DIR}/ForwardingHeaders)
> set(FORWARDING_HEADERS_WPE_DIR ${FORWARDING_HEADERS_DIR}/wpe)
>diff --git a/ChangeLog b/ChangeLog
>index 22dfeddbb58b3a3b4b5dbd18c54e631e34920674..b001897907ccf0d9d81f1cc93f8ce41e3f2cd7fb 100644
>--- a/ChangeLog
>+++ b/ChangeLog
>@@ -1,3 +1,13 @@
>+2018-08-17  Zan Dobersek  <zdobersek@igalia.com>
>+
>+        [CoordGraphics] Switch to Nicosia::CompositionLayer state tracking
>+        https://bugs.webkit.org/show_bug.cgi?id=188693
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Source/cmake/OptionsGTK.cmake:
>+        * Source/cmake/OptionsWPE.cmake:
>+
> 2018-07-30  Thibault Saunier  <tsaunier@igalia.com>
> 
>         [GStreamer] Make codecparsers optionnal

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Attachments on bug 188693: 347355 | 347444 | 347483 | 347487 | 347494 | 347502 | 347514 | 347616 | 347627 | 347678 | 347779