Source/WebKit2/UIProcess/mac/RemoteLayerTreeDrawingAreaProxy.mm - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2012-2014 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.
  */

 #import "config.h"
 #import "RemoteLayerTreeDrawingAreaProxy.h"

 #import "Logging.h"
 #import "RemoteLayerTreeDrawingAreaProxyMessages.h"
 #import "DrawingAreaMessages.h"
 #import "RemoteScrollingCoordinatorProxy.h"
 #import "RemoteScrollingCoordinatorTransaction.h"
 #import "WebPageProxy.h"
 #import "WebProcessProxy.h"
 #import <QuartzCore/QuartzCore.h>
 #import <WebCore/IOSurfacePool.h>
 #import <WebCore/WebActionDisablingCALayerDelegate.h>

 using namespace IPC;
 using namespace WebCore;

 // FIXME: Mac will need something similar; we should figure out how to share this with DisplayRefreshMonitor without
 // breaking WebKit1 behavior or WebKit2-WebKit1 coexistence.
 #if PLATFORM(IOS)
 @interface OneShotDisplayLinkHandler : NSObject {
     WebKit::RemoteLayerTreeDrawingAreaProxy* _drawingAreaProxy;
     CADisplayLink *_displayLink;
 }

 - (id)initWithDrawingAreaProxy:(WebKit::RemoteLayerTreeDrawingAreaProxy*)drawingAreaProxy;
 - (void)displayLinkFired:(CADisplayLink *)sender;
 - (void)invalidate;
 - (void)schedule;

 @end

 @implementation OneShotDisplayLinkHandler

 - (id)initWithDrawingAreaProxy:(WebKit::RemoteLayerTreeDrawingAreaProxy*)drawingAreaProxy
 {
     if (self = [super init]) {
         _drawingAreaProxy = drawingAreaProxy;
         // Note that CADisplayLink retains its target (self), so a call to -invalidate is needed on teardown.
         _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkFired:)];
         [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
         _displayLink.paused = YES;
     }
     return self;
 }

 - (void)dealloc
 {
     ASSERT(!_displayLink);
     [super dealloc];
 }

 - (void)displayLinkFired:(CADisplayLink *)sender
 {
     ASSERT(isUIThread());
     _drawingAreaProxy->didRefreshDisplay(sender.timestamp);
     _displayLink.paused = YES;
 }

 - (void)invalidate
 {
     [_displayLink invalidate];
     _displayLink = nullptr;
 }

 - (void)schedule
 {
     _displayLink.paused = NO;
 }

 @end
 #endif

 namespace WebKit {

 RemoteLayerTreeDrawingAreaProxy::RemoteLayerTreeDrawingAreaProxy(WebPageProxy* webPageProxy)
     : DrawingAreaProxy(DrawingAreaTypeRemoteLayerTree, webPageProxy)
     , m_remoteLayerTreeHost(*this)
     , m_isWaitingForDidUpdateGeometry(false)
     , m_pendingLayerTreeTransactionID(0)
     , m_lastVisibleTransactionID(0)
     , m_transactionIDForPendingCACommit(0)
 #if PLATFORM(IOS)
     , m_displayLinkHandler(adoptNS([[OneShotDisplayLinkHandler alloc] initWithDrawingAreaProxy:this]))
 #endif
 {
 #if USE(IOSURFACE)
     // We don't want to pool surfaces in the UI process.
     // FIXME: We should do this somewhere else.
     IOSurfacePool::sharedPool().setPoolSize(0);
 #endif

     m_webPageProxy->process().addMessageReceiver(Messages::RemoteLayerTreeDrawingAreaProxy::messageReceiverName(), m_webPageProxy->pageID(), *this);

     if (m_webPageProxy->preferences().tiledScrollingIndicatorVisible())
         initializeDebugIndicator();
 }

 RemoteLayerTreeDrawingAreaProxy::~RemoteLayerTreeDrawingAreaProxy()
 {
     m_callbacks.invalidate(CallbackBase::Error::OwnerWasInvalidated);
     m_webPageProxy->process().removeMessageReceiver(Messages::RemoteLayerTreeDrawingAreaProxy::messageReceiverName(), m_webPageProxy->pageID());

 #if PLATFORM(IOS)
     [m_displayLinkHandler invalidate];
 #endif
 }

 void RemoteLayerTreeDrawingAreaProxy::sizeDidChange()
 {
     if (!m_webPageProxy->isValid())
         return;

     if (m_isWaitingForDidUpdateGeometry)
         return;

     sendUpdateGeometry();
 }

 void RemoteLayerTreeDrawingAreaProxy::deviceScaleFactorDidChange()
 {
     m_webPageProxy->process().send(Messages::DrawingArea::SetDeviceScaleFactor(m_webPageProxy->deviceScaleFactor()), m_webPageProxy->pageID());
 }

 void RemoteLayerTreeDrawingAreaProxy::didUpdateGeometry()
 {
     ASSERT(m_isWaitingForDidUpdateGeometry);

     m_isWaitingForDidUpdateGeometry = false;

     // If the WKView was resized while we were waiting for a DidUpdateGeometry reply from the web process,
     // we need to resend the new size here.
     if (m_lastSentSize != m_size || m_lastSentLayerPosition != m_layerPosition)
         sendUpdateGeometry();
 }

 FloatRect RemoteLayerTreeDrawingAreaProxy::scaledExposedRect() const
 {
 #if PLATFORM(IOS)
     return m_webPageProxy->exposedContentRect();
 #else
     FloatRect scaledExposedRect = exposedRect();
     float scale = 1 / m_webPageProxy->pageScaleFactor();
     scaledExposedRect.scale(scale, scale);
     return scaledExposedRect;
 #endif
 }

 void RemoteLayerTreeDrawingAreaProxy::sendUpdateGeometry()
 {
     m_lastSentSize = m_size;
     m_lastSentLayerPosition = m_layerPosition;
     m_webPageProxy->process().send(Messages::DrawingArea::UpdateGeometry(m_size, m_layerPosition), m_webPageProxy->pageID());
     m_isWaitingForDidUpdateGeometry = true;
 }

 void RemoteLayerTreeDrawingAreaProxy::willCommitLayerTree(uint64_t transactionID)
 {
     m_pendingLayerTreeTransactionID = transactionID;
 }

 void RemoteLayerTreeDrawingAreaProxy::commitLayerTree(const RemoteLayerTreeTransaction& layerTreeTransaction, const RemoteScrollingCoordinatorTransaction& scrollingTreeTransaction)
 {
     LOG(RemoteLayerTree, "%s", layerTreeTransaction.description().data());
     LOG(RemoteLayerTree, "%s", scrollingTreeTransaction.description().data());

     ASSERT(layerTreeTransaction.transactionID() == m_lastVisibleTransactionID + 1);
     m_transactionIDForPendingCACommit = layerTreeTransaction.transactionID();

     for (auto& callbackID : layerTreeTransaction.callbackIDs()) {
         if (auto callback = m_callbacks.take<VoidCallback>(callbackID))
             callback->performCallback();
     }

     if (m_remoteLayerTreeHost.updateLayerTree(layerTreeTransaction))
         m_webPageProxy->setAcceleratedCompositingRootLayer(m_remoteLayerTreeHost.rootLayer());

 #if ENABLE(ASYNC_SCROLLING)
     RemoteScrollingCoordinatorProxy::RequestedScrollInfo requestedScrollInfo;
     m_webPageProxy->scrollingCoordinatorProxy()->updateScrollingTree(scrollingTreeTransaction, requestedScrollInfo);
 #endif

     m_webPageProxy->didCommitLayerTree(layerTreeTransaction);

 #if ENABLE(ASYNC_SCROLLING)
 #if PLATFORM(IOS)
     if (m_webPageProxy->scrollingCoordinatorProxy()->hasFixedOrSticky()) {
         // If we got a new layer for a fixed or sticky node, its position from the WebProcess is probably stale. We need to re-run the "viewport" changed logic to udpate it with our UI-side state.
         FloatRect customFixedPositionRect = m_webPageProxy->computeCustomFixedPositionRect(m_webPageProxy->unobscuredContentRect(), m_webPageProxy->displayedContentScale());
         m_webPageProxy->scrollingCoordinatorProxy()->viewportChangedViaDelegatedScrolling(m_webPageProxy->scrollingCoordinatorProxy()->rootScrollingNodeID(), customFixedPositionRect, m_webPageProxy->displayedContentScale());
     }
 #endif

     // Handle requested scroll position updates from the scrolling tree transaction after didCommitLayerTree()
     // has updated the view size based on the content size.
     if (requestedScrollInfo.requestsScrollPositionUpdate)
         m_webPageProxy->requestScroll(requestedScrollInfo.requestedScrollPosition, requestedScrollInfo.requestIsProgrammaticScroll);
 #endif // ENABLE(ASYNC_SCROLLING)

     if (m_debugIndicatorLayerTreeHost) {
         float scale = indicatorScale(layerTreeTransaction.contentsSize());
         bool rootLayerChanged = m_debugIndicatorLayerTreeHost->updateLayerTree(layerTreeTransaction, scale);
         updateDebugIndicator(layerTreeTransaction.contentsSize(), rootLayerChanged, scale);
         asLayer(m_debugIndicatorLayerTreeHost->rootLayer()).name = @"Indicator host root";
     }

 #if PLATFORM(IOS)
     [m_displayLinkHandler schedule];
 #else
     didRefreshDisplay(monotonicallyIncreasingTime());
 #endif
 }

 void RemoteLayerTreeDrawingAreaProxy::acceleratedAnimationDidStart(uint64_t layerID, const String& key, double startTime)
 {
     m_webPageProxy->process().send(Messages::DrawingArea::AcceleratedAnimationDidStart(layerID, key, startTime), m_webPageProxy->pageID());
 }

 static const float indicatorInset = 10;

 #if PLATFORM(MAC)
 void RemoteLayerTreeDrawingAreaProxy::setExposedRect(const WebCore::FloatRect& r)
 {
     DrawingAreaProxy::setExposedRect(r);
     updateDebugIndicatorPosition();
 }
 #endif

 FloatPoint RemoteLayerTreeDrawingAreaProxy::indicatorLocation() const
 {
     if (m_webPageProxy->delegatesScrolling()) {
 #if PLATFORM(IOS)
         FloatPoint tiledMapLocation = m_webPageProxy->unobscuredContentRect().location();
         float absoluteInset = indicatorInset / m_webPageProxy->displayedContentScale();
         tiledMapLocation += FloatSize(absoluteInset, absoluteInset);
 #else
         FloatPoint tiledMapLocation = exposedRect().location();
         tiledMapLocation += FloatSize(indicatorInset, indicatorInset);
         float scale = 1 / m_webPageProxy->pageScaleFactor();;
         tiledMapLocation.scale(scale, scale);
 #endif
         return tiledMapLocation;
     }

     return FloatPoint(indicatorInset, indicatorInset);
 }

 void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicatorPosition()
 {
     if (!m_tileMapHostLayer)
         return;

     [m_tileMapHostLayer setPosition:indicatorLocation()];
 }

 float RemoteLayerTreeDrawingAreaProxy::indicatorScale(IntSize contentsSize) const
 {
     // Pick a good scale.
     IntSize viewSize = m_webPageProxy->viewSize();

     float scale = 1;
     if (!contentsSize.isEmpty()) {
         float widthScale = std::min<float>((viewSize.width() - 2 * indicatorInset) / contentsSize.width(), 0.05);
         scale = std::min(widthScale, static_cast<float>(viewSize.height() - 2 * indicatorInset) / contentsSize.height());
     }

     return scale;
 }

 void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicator()
 {
     // FIXME: we should also update live information during scale.
     updateDebugIndicatorPosition();
 }

 void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicator(IntSize contentsSize, bool rootLayerChanged, float scale)
 {
     // Make sure we're the last sublayer.
     CALayer *rootLayer = asLayer(m_remoteLayerTreeHost.rootLayer());
     [m_tileMapHostLayer removeFromSuperlayer];
     [rootLayer addSublayer:m_tileMapHostLayer.get()];

     // Pick a good scale.
     IntSize viewSize = m_webPageProxy->viewSize();

     [m_tileMapHostLayer setBounds:FloatRect(FloatPoint(), contentsSize)];
     [m_tileMapHostLayer setPosition:indicatorLocation()];
     [m_tileMapHostLayer setTransform:CATransform3DMakeScale(scale, scale, 1)];

     if (rootLayerChanged) {
         [m_tileMapHostLayer setSublayers:@[]];
         [m_tileMapHostLayer addSublayer:asLayer(m_debugIndicatorLayerTreeHost->rootLayer())];
         [m_tileMapHostLayer addSublayer:m_exposedRectIndicatorLayer.get()];
     }

     const float indicatorBorderWidth = 1;
     float counterScaledBorder = indicatorBorderWidth / scale;

     [m_exposedRectIndicatorLayer setBorderWidth:counterScaledBorder];

     if (m_webPageProxy->delegatesScrolling()) {
         FloatRect scaledExposedRect = this->scaledExposedRect();
         [m_exposedRectIndicatorLayer setPosition:scaledExposedRect.location()];
         [m_exposedRectIndicatorLayer setBounds:FloatRect(FloatPoint(), scaledExposedRect.size())];
     } else {
         // FIXME: Get the correct scroll position.
         [m_exposedRectIndicatorLayer setBounds:FloatRect(FloatPoint(), viewSize)];
     }
 }

 void RemoteLayerTreeDrawingAreaProxy::initializeDebugIndicator()
 {
     m_debugIndicatorLayerTreeHost = std::make_unique<RemoteLayerTreeHost>(*this);
     m_debugIndicatorLayerTreeHost->setIsDebugLayerTreeHost(true);

     m_tileMapHostLayer = adoptNS([[CALayer alloc] init]);
     [m_tileMapHostLayer setName:@"Tile map host"];
     [m_tileMapHostLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
     [m_tileMapHostLayer setAnchorPoint:CGPointZero];
     [m_tileMapHostLayer setOpacity:0.8];
     [m_tileMapHostLayer setMasksToBounds:YES];
     [m_tileMapHostLayer setBorderWidth:2];

     RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
     {
         const CGFloat components[] = { 1, 1, 1, 0.6 };
         RetainPtr<CGColorRef> color = adoptCF(CGColorCreate(colorSpace.get(), components));
         [m_tileMapHostLayer setBackgroundColor:color.get()];

         const CGFloat borderComponents[] = { 0, 0, 0, 1 };
         RetainPtr<CGColorRef> borderColor = adoptCF(CGColorCreate(colorSpace.get(), borderComponents));
         [m_tileMapHostLayer setBorderColor:borderColor.get()];
     }

     m_exposedRectIndicatorLayer = adoptNS([[CALayer alloc] init]);
     [m_exposedRectIndicatorLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
     [m_exposedRectIndicatorLayer setAnchorPoint:CGPointZero];

     {
         const CGFloat components[] = { 0, 1, 0, 1 };
         RetainPtr<CGColorRef> color = adoptCF(CGColorCreate(colorSpace.get(), components));
         [m_exposedRectIndicatorLayer setBorderColor:color.get()];
     }
 }

 void RemoteLayerTreeDrawingAreaProxy::didRefreshDisplay(double)
 {
     if (!m_webPageProxy->isValid())
         return;

     // Waiting for CA to commit is insufficient, because the render server can still be
     // using our backing store. We can improve this by waiting for the render server to commit
     // if we find API to do so, but for now we will make extra buffers if need be.
     m_webPageProxy->process().send(Messages::DrawingArea::DidUpdate(), m_webPageProxy->pageID());

     m_lastVisibleTransactionID = m_transactionIDForPendingCACommit;

     m_webPageProxy->didUpdateViewState();
 }

 void RemoteLayerTreeDrawingAreaProxy::waitForDidUpdateViewState()
 {
 #if PLATFORM(IOS)
     auto viewStateUpdateTimeout = std::chrono::milliseconds(500);
 #else
     auto viewStateUpdateTimeout = std::chrono::milliseconds(250);
 #endif
     m_webPageProxy->process().connection()->waitForAndDispatchImmediately<Messages::RemoteLayerTreeDrawingAreaProxy::CommitLayerTree>(m_webPageProxy->pageID(), viewStateUpdateTimeout, InterruptWaitingIfSyncMessageArrives);
 }

 void RemoteLayerTreeDrawingAreaProxy::dispatchAfterEnsuringDrawing(std::function<void (CallbackBase::Error)> callbackFunction)
 {
     if (!m_webPageProxy->isValid()) {
         callbackFunction(CallbackBase::Error::OwnerWasInvalidated);
         return;
     }

     m_webPageProxy->process().send(Messages::DrawingArea::AddTransactionCallbackID(m_callbacks.put(WTF::move(callbackFunction), nullptr)), m_webPageProxy->pageID());
 }

 void RemoteLayerTreeDrawingAreaProxy::hideContentUntilNextUpdate()
 {
     m_remoteLayerTreeHost.detachRootLayer();
 }

 } // namespace WebKit
	/*
	* Copyright (C) 2012-2014 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.
	*/

	#import "config.h"
	#import "RemoteLayerTreeDrawingAreaProxy.h"

	#import "Logging.h"
	#import "RemoteLayerTreeDrawingAreaProxyMessages.h"
	#import "DrawingAreaMessages.h"
	#import "RemoteScrollingCoordinatorProxy.h"
	#import "RemoteScrollingCoordinatorTransaction.h"
	#import "WebPageProxy.h"
	#import "WebProcessProxy.h"
	#import <QuartzCore/QuartzCore.h>
	#import <WebCore/IOSurfacePool.h>
	#import <WebCore/WebActionDisablingCALayerDelegate.h>

	using namespace IPC;
	using namespace WebCore;

	// FIXME: Mac will need something similar; we should figure out how to share this with DisplayRefreshMonitor without
	// breaking WebKit1 behavior or WebKit2-WebKit1 coexistence.
	#if PLATFORM(IOS)
	@interface OneShotDisplayLinkHandler : NSObject {
	WebKit::RemoteLayerTreeDrawingAreaProxy* _drawingAreaProxy;
	CADisplayLink *_displayLink;
	}

	- (id)initWithDrawingAreaProxy:(WebKit::RemoteLayerTreeDrawingAreaProxy*)drawingAreaProxy;
	- (void)displayLinkFired:(CADisplayLink *)sender;
	- (void)invalidate;
	- (void)schedule;

	@end

	@implementation OneShotDisplayLinkHandler

	- (id)initWithDrawingAreaProxy:(WebKit::RemoteLayerTreeDrawingAreaProxy*)drawingAreaProxy
	{
	if (self = [super init]) {
	_drawingAreaProxy = drawingAreaProxy;
	// Note that CADisplayLink retains its target (self), so a call to -invalidate is needed on teardown.
	_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkFired:)];
	[_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
	_displayLink.paused = YES;
	}
	return self;
	}

	- (void)dealloc
	{
	ASSERT(!_displayLink);
	[super dealloc];
	}

	- (void)displayLinkFired:(CADisplayLink *)sender
	{
	ASSERT(isUIThread());
	_drawingAreaProxy->didRefreshDisplay(sender.timestamp);
	_displayLink.paused = YES;
	}

	- (void)invalidate
	{
	[_displayLink invalidate];
	_displayLink = nullptr;
	}

	- (void)schedule
	{
	_displayLink.paused = NO;
	}

	@end
	#endif

	namespace WebKit {

	RemoteLayerTreeDrawingAreaProxy::RemoteLayerTreeDrawingAreaProxy(WebPageProxy* webPageProxy)
	: DrawingAreaProxy(DrawingAreaTypeRemoteLayerTree, webPageProxy)
	, m_remoteLayerTreeHost(*this)
	, m_isWaitingForDidUpdateGeometry(false)
	, m_pendingLayerTreeTransactionID(0)
	, m_lastVisibleTransactionID(0)
	, m_transactionIDForPendingCACommit(0)
	#if PLATFORM(IOS)
	, m_displayLinkHandler(adoptNS([[OneShotDisplayLinkHandler alloc] initWithDrawingAreaProxy:this]))
	#endif
	{
	#if USE(IOSURFACE)
	// We don't want to pool surfaces in the UI process.
	// FIXME: We should do this somewhere else.
	IOSurfacePool::sharedPool().setPoolSize(0);
	#endif

	m_webPageProxy->process().addMessageReceiver(Messages::RemoteLayerTreeDrawingAreaProxy::messageReceiverName(), m_webPageProxy->pageID(), *this);

	if (m_webPageProxy->preferences().tiledScrollingIndicatorVisible())
	initializeDebugIndicator();
	}

	RemoteLayerTreeDrawingAreaProxy::~RemoteLayerTreeDrawingAreaProxy()
	{
	m_callbacks.invalidate(CallbackBase::Error::OwnerWasInvalidated);
	m_webPageProxy->process().removeMessageReceiver(Messages::RemoteLayerTreeDrawingAreaProxy::messageReceiverName(), m_webPageProxy->pageID());

	#if PLATFORM(IOS)
	[m_displayLinkHandler invalidate];
	#endif
	}

	void RemoteLayerTreeDrawingAreaProxy::sizeDidChange()
	{
	if (!m_webPageProxy->isValid())
	return;

	if (m_isWaitingForDidUpdateGeometry)
	return;

	sendUpdateGeometry();
	}

	void RemoteLayerTreeDrawingAreaProxy::deviceScaleFactorDidChange()
	{
	m_webPageProxy->process().send(Messages::DrawingArea::SetDeviceScaleFactor(m_webPageProxy->deviceScaleFactor()), m_webPageProxy->pageID());
	}

	void RemoteLayerTreeDrawingAreaProxy::didUpdateGeometry()
	{
	ASSERT(m_isWaitingForDidUpdateGeometry);

	m_isWaitingForDidUpdateGeometry = false;

	// If the WKView was resized while we were waiting for a DidUpdateGeometry reply from the web process,
	// we need to resend the new size here.
	if (m_lastSentSize != m_size \|\| m_lastSentLayerPosition != m_layerPosition)
	sendUpdateGeometry();
	}

	FloatRect RemoteLayerTreeDrawingAreaProxy::scaledExposedRect() const
	{
	#if PLATFORM(IOS)
	return m_webPageProxy->exposedContentRect();
	#else
	FloatRect scaledExposedRect = exposedRect();
	float scale = 1 / m_webPageProxy->pageScaleFactor();
	scaledExposedRect.scale(scale, scale);
	return scaledExposedRect;
	#endif
	}

	void RemoteLayerTreeDrawingAreaProxy::sendUpdateGeometry()
	{
	m_lastSentSize = m_size;
	m_lastSentLayerPosition = m_layerPosition;
	m_webPageProxy->process().send(Messages::DrawingArea::UpdateGeometry(m_size, m_layerPosition), m_webPageProxy->pageID());
	m_isWaitingForDidUpdateGeometry = true;
	}

	void RemoteLayerTreeDrawingAreaProxy::willCommitLayerTree(uint64_t transactionID)
	{
	m_pendingLayerTreeTransactionID = transactionID;
	}

	void RemoteLayerTreeDrawingAreaProxy::commitLayerTree(const RemoteLayerTreeTransaction& layerTreeTransaction, const RemoteScrollingCoordinatorTransaction& scrollingTreeTransaction)
	{
	LOG(RemoteLayerTree, "%s", layerTreeTransaction.description().data());
	LOG(RemoteLayerTree, "%s", scrollingTreeTransaction.description().data());

	ASSERT(layerTreeTransaction.transactionID() == m_lastVisibleTransactionID + 1);
	m_transactionIDForPendingCACommit = layerTreeTransaction.transactionID();

	for (auto& callbackID : layerTreeTransaction.callbackIDs()) {
	if (auto callback = m_callbacks.take<VoidCallback>(callbackID))
	callback->performCallback();
	}

	if (m_remoteLayerTreeHost.updateLayerTree(layerTreeTransaction))
	m_webPageProxy->setAcceleratedCompositingRootLayer(m_remoteLayerTreeHost.rootLayer());

	#if ENABLE(ASYNC_SCROLLING)
	RemoteScrollingCoordinatorProxy::RequestedScrollInfo requestedScrollInfo;
	m_webPageProxy->scrollingCoordinatorProxy()->updateScrollingTree(scrollingTreeTransaction, requestedScrollInfo);
	#endif

	m_webPageProxy->didCommitLayerTree(layerTreeTransaction);

	#if ENABLE(ASYNC_SCROLLING)
	#if PLATFORM(IOS)
	if (m_webPageProxy->scrollingCoordinatorProxy()->hasFixedOrSticky()) {
	// If we got a new layer for a fixed or sticky node, its position from the WebProcess is probably stale. We need to re-run the "viewport" changed logic to udpate it with our UI-side state.
	FloatRect customFixedPositionRect = m_webPageProxy->computeCustomFixedPositionRect(m_webPageProxy->unobscuredContentRect(), m_webPageProxy->displayedContentScale());
	m_webPageProxy->scrollingCoordinatorProxy()->viewportChangedViaDelegatedScrolling(m_webPageProxy->scrollingCoordinatorProxy()->rootScrollingNodeID(), customFixedPositionRect, m_webPageProxy->displayedContentScale());
	}
	#endif

	// Handle requested scroll position updates from the scrolling tree transaction after didCommitLayerTree()
	// has updated the view size based on the content size.
	if (requestedScrollInfo.requestsScrollPositionUpdate)
	m_webPageProxy->requestScroll(requestedScrollInfo.requestedScrollPosition, requestedScrollInfo.requestIsProgrammaticScroll);
	#endif // ENABLE(ASYNC_SCROLLING)

	if (m_debugIndicatorLayerTreeHost) {
	float scale = indicatorScale(layerTreeTransaction.contentsSize());
	bool rootLayerChanged = m_debugIndicatorLayerTreeHost->updateLayerTree(layerTreeTransaction, scale);
	updateDebugIndicator(layerTreeTransaction.contentsSize(), rootLayerChanged, scale);
	asLayer(m_debugIndicatorLayerTreeHost->rootLayer()).name = @"Indicator host root";
	}

	#if PLATFORM(IOS)
	[m_displayLinkHandler schedule];
	#else
	didRefreshDisplay(monotonicallyIncreasingTime());
	#endif
	}

	void RemoteLayerTreeDrawingAreaProxy::acceleratedAnimationDidStart(uint64_t layerID, const String& key, double startTime)
	{
	m_webPageProxy->process().send(Messages::DrawingArea::AcceleratedAnimationDidStart(layerID, key, startTime), m_webPageProxy->pageID());
	}

	static const float indicatorInset = 10;

	#if PLATFORM(MAC)
	void RemoteLayerTreeDrawingAreaProxy::setExposedRect(const WebCore::FloatRect& r)
	{
	DrawingAreaProxy::setExposedRect(r);
	updateDebugIndicatorPosition();
	}
	#endif

	FloatPoint RemoteLayerTreeDrawingAreaProxy::indicatorLocation() const
	{
	if (m_webPageProxy->delegatesScrolling()) {
	#if PLATFORM(IOS)
	FloatPoint tiledMapLocation = m_webPageProxy->unobscuredContentRect().location();
	float absoluteInset = indicatorInset / m_webPageProxy->displayedContentScale();
	tiledMapLocation += FloatSize(absoluteInset, absoluteInset);
	#else
	FloatPoint tiledMapLocation = exposedRect().location();
	tiledMapLocation += FloatSize(indicatorInset, indicatorInset);
	float scale = 1 / m_webPageProxy->pageScaleFactor();;
	tiledMapLocation.scale(scale, scale);
	#endif
	return tiledMapLocation;
	}

	return FloatPoint(indicatorInset, indicatorInset);
	}

	void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicatorPosition()
	{
	if (!m_tileMapHostLayer)
	return;

	[m_tileMapHostLayer setPosition:indicatorLocation()];
	}

	float RemoteLayerTreeDrawingAreaProxy::indicatorScale(IntSize contentsSize) const
	{
	// Pick a good scale.
	IntSize viewSize = m_webPageProxy->viewSize();

	float scale = 1;
	if (!contentsSize.isEmpty()) {
	float widthScale = std::min<float>((viewSize.width() - 2 * indicatorInset) / contentsSize.width(), 0.05);
	scale = std::min(widthScale, static_cast<float>(viewSize.height() - 2 * indicatorInset) / contentsSize.height());
	}

	return scale;
	}

	void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicator()
	{
	// FIXME: we should also update live information during scale.
	updateDebugIndicatorPosition();
	}

	void RemoteLayerTreeDrawingAreaProxy::updateDebugIndicator(IntSize contentsSize, bool rootLayerChanged, float scale)
	{
	// Make sure we're the last sublayer.
	CALayer *rootLayer = asLayer(m_remoteLayerTreeHost.rootLayer());
	[m_tileMapHostLayer removeFromSuperlayer];
	[rootLayer addSublayer:m_tileMapHostLayer.get()];

	// Pick a good scale.
	IntSize viewSize = m_webPageProxy->viewSize();

	[m_tileMapHostLayer setBounds:FloatRect(FloatPoint(), contentsSize)];
	[m_tileMapHostLayer setPosition:indicatorLocation()];
	[m_tileMapHostLayer setTransform:CATransform3DMakeScale(scale, scale, 1)];

	if (rootLayerChanged) {
	[m_tileMapHostLayer setSublayers:@[]];
	[m_tileMapHostLayer addSublayer:asLayer(m_debugIndicatorLayerTreeHost->rootLayer())];
	[m_tileMapHostLayer addSublayer:m_exposedRectIndicatorLayer.get()];
	}

	const float indicatorBorderWidth = 1;
	float counterScaledBorder = indicatorBorderWidth / scale;

	[m_exposedRectIndicatorLayer setBorderWidth:counterScaledBorder];

	if (m_webPageProxy->delegatesScrolling()) {
	FloatRect scaledExposedRect = this->scaledExposedRect();
	[m_exposedRectIndicatorLayer setPosition:scaledExposedRect.location()];
	[m_exposedRectIndicatorLayer setBounds:FloatRect(FloatPoint(), scaledExposedRect.size())];
	} else {
	// FIXME: Get the correct scroll position.
	[m_exposedRectIndicatorLayer setBounds:FloatRect(FloatPoint(), viewSize)];
	}
	}

	void RemoteLayerTreeDrawingAreaProxy::initializeDebugIndicator()
	{
	m_debugIndicatorLayerTreeHost = std::make_unique<RemoteLayerTreeHost>(*this);
	m_debugIndicatorLayerTreeHost->setIsDebugLayerTreeHost(true);

	m_tileMapHostLayer = adoptNS([[CALayer alloc] init]);
	[m_tileMapHostLayer setName:@"Tile map host"];
	[m_tileMapHostLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
	[m_tileMapHostLayer setAnchorPoint:CGPointZero];
	[m_tileMapHostLayer setOpacity:0.8];
	[m_tileMapHostLayer setMasksToBounds:YES];
	[m_tileMapHostLayer setBorderWidth:2];

	RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
	{
	const CGFloat components[] = { 1, 1, 1, 0.6 };
	RetainPtr<CGColorRef> color = adoptCF(CGColorCreate(colorSpace.get(), components));
	[m_tileMapHostLayer setBackgroundColor:color.get()];

	const CGFloat borderComponents[] = { 0, 0, 0, 1 };
	RetainPtr<CGColorRef> borderColor = adoptCF(CGColorCreate(colorSpace.get(), borderComponents));
	[m_tileMapHostLayer setBorderColor:borderColor.get()];
	}

	m_exposedRectIndicatorLayer = adoptNS([[CALayer alloc] init]);
	[m_exposedRectIndicatorLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
	[m_exposedRectIndicatorLayer setAnchorPoint:CGPointZero];

	{
	const CGFloat components[] = { 0, 1, 0, 1 };
	RetainPtr<CGColorRef> color = adoptCF(CGColorCreate(colorSpace.get(), components));
	[m_exposedRectIndicatorLayer setBorderColor:color.get()];
	}
	}

	void RemoteLayerTreeDrawingAreaProxy::didRefreshDisplay(double)
	{
	if (!m_webPageProxy->isValid())
	return;

	// Waiting for CA to commit is insufficient, because the render server can still be
	// using our backing store. We can improve this by waiting for the render server to commit
	// if we find API to do so, but for now we will make extra buffers if need be.
	m_webPageProxy->process().send(Messages::DrawingArea::DidUpdate(), m_webPageProxy->pageID());

	m_lastVisibleTransactionID = m_transactionIDForPendingCACommit;

	m_webPageProxy->didUpdateViewState();
	}

	void RemoteLayerTreeDrawingAreaProxy::waitForDidUpdateViewState()
	{
	#if PLATFORM(IOS)
	auto viewStateUpdateTimeout = std::chrono::milliseconds(500);
	#else
	auto viewStateUpdateTimeout = std::chrono::milliseconds(250);
	#endif
	m_webPageProxy->process().connection()->waitForAndDispatchImmediately<Messages::RemoteLayerTreeDrawingAreaProxy::CommitLayerTree>(m_webPageProxy->pageID(), viewStateUpdateTimeout, InterruptWaitingIfSyncMessageArrives);
	}

	void RemoteLayerTreeDrawingAreaProxy::dispatchAfterEnsuringDrawing(std::function<void (CallbackBase::Error)> callbackFunction)
	{
	if (!m_webPageProxy->isValid()) {
	callbackFunction(CallbackBase::Error::OwnerWasInvalidated);
	return;
	}

	m_webPageProxy->process().send(Messages::DrawingArea::AddTransactionCallbackID(m_callbacks.put(WTF::move(callbackFunction), nullptr)), m_webPageProxy->pageID());
	}

	void RemoteLayerTreeDrawingAreaProxy::hideContentUntilNextUpdate()
	{
	m_remoteLayerTreeHost.detachRootLayer();
	}

	} // namespace WebKit