Source/platform/graphics/GraphicsLayer.cpp

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This source file includes following definitions.
repaintRectMap
create
m_3dRenderingContext
setParent
hasAncestor
setChildren
addChildInternal
addChild
addChildAtIndex
addChildBelow
addChildAbove
replaceChild
removeAllChildren
removeFromParent
setReplicatedByLayer
setOffsetFromRenderer
paintGraphicsLayerContents
setZPosition
updateChildList
updateLayerIsDrawable
updateContentsRect
registerContentsLayer
unregisterContentsLayer
setContentsTo
setupContentsLayer
clearContentsLayerIfUnregistered
debugInfo
takeDebugInfoFor
contentsLayerIfRegistered
resetTrackedRepaints
addRepaintRect
collectTrackedRepaintRects
dumpLayer
dumpProperties
layerTreeAsText
debugName
setCompositingReasons
setPosition
setAnchorPoint
setSize
setTransform
setShouldFlattenTransform
setRenderingContext
setMasksToBounds
setDrawsContent
setContentsVisible
setClipParent
setScrollParent
setBackgroundColor
setContentsOpaque
setMaskLayer
setContentsClippingMaskLayer
setBackfaceVisibility
setOpacity
setBlendMode
setIsRootForIsolatedGroup
setHasGpuRasterizationHint
setContentsNeedsDisplay
setNeedsDisplay
setNeedsDisplayInRect
setContentsRect
setContentsToImage
setContentsToNinePatch
addAnimation
pauseAnimation
removeAnimation
platformLayer
copyWebCoreFilterOperationsToWebFilterOperations
setFilters
setBackgroundFilters
addLinkHighlight
removeLinkHighlight
setScrollableArea
paint
notifyAnimationStarted
notifyAnimationFinished
didScroll
showGraphicsLayerTree
/*
 * Copyright (C) 2009 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. ``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 COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include "platform/graphics/GraphicsLayer.h"

#include "SkImageFilter.h"
#include "SkMatrix44.h"
#include "platform/geometry/FloatRect.h"
#include "platform/geometry/LayoutRect.h"
#include "platform/graphics/GraphicsLayerFactory.h"
#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
#include "platform/graphics/skia/NativeImageSkia.h"
#include "platform/scroll/ScrollableArea.h"
#include "platform/text/TextStream.h"
#include "public/platform/Platform.h"
#include "public/platform/WebAnimation.h"
#include "public/platform/WebCompositorSupport.h"
#include "public/platform/WebFilterOperations.h"
#include "public/platform/WebFloatPoint.h"
#include "public/platform/WebFloatRect.h"
#include "public/platform/WebGraphicsLayerDebugInfo.h"
#include "public/platform/WebLayer.h"
#include "public/platform/WebPoint.h"
#include "public/platform/WebSize.h"
#include "wtf/CurrentTime.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/text/WTFString.h"

#ifndef NDEBUG
#include <stdio.h>
#endif

using blink::Platform;
using blink::WebAnimation;
using blink::WebFilterOperations;
using blink::WebLayer;
using blink::WebPoint;

namespace WebCore {

typedef HashMap<const GraphicsLayer*, Vector<FloatRect> > RepaintMap;
static RepaintMap& repaintRectMap()
{
    DEFINE_STATIC_LOCAL(RepaintMap, map, ());
    return map;
}

PassOwnPtr<GraphicsLayer> GraphicsLayer::create(GraphicsLayerFactory* factory, GraphicsLayerClient* client)
{
    return factory->createGraphicsLayer(client);
}

GraphicsLayer::GraphicsLayer(GraphicsLayerClient* client)
    : m_client(client)
    , m_anchorPoint(0.5f, 0.5f, 0)
    , m_backgroundColor(Color::transparent)
    , m_opacity(1)
    , m_zPosition(0)
    , m_blendMode(blink::WebBlendModeNormal)
    , m_contentsOpaque(false)
    , m_shouldFlattenTransform(true)
    , m_backfaceVisibility(true)
    , m_masksToBounds(false)
    , m_drawsContent(false)
    , m_contentsVisible(true)
    , m_isRootForIsolatedGroup(false)
    , m_hasGpuRasterizationHint(false)
    , m_hasScrollParent(false)
    , m_hasClipParent(false)
    , m_paintingPhase(GraphicsLayerPaintAllWithOverflowClip)
    , m_contentsOrientation(CompositingCoordinatesTopDown)
    , m_parent(0)
    , m_maskLayer(0)
    , m_contentsClippingMaskLayer(0)
    , m_replicaLayer(0)
    , m_replicatedLayer(0)
    , m_paintCount(0)
    , m_contentsLayer(0)
    , m_contentsLayerId(0)
    , m_scrollableArea(0)
    , m_3dRenderingContext(0)
{
#ifndef NDEBUG
    if (m_client)
        m_client->verifyNotPainting();
#endif

    m_opaqueRectTrackingContentLayerDelegate = adoptPtr(new OpaqueRectTrackingContentLayerDelegate(this));
    m_layer = adoptPtr(Platform::current()->compositorSupport()->createContentLayer(m_opaqueRectTrackingContentLayerDelegate.get()));
    m_layer->layer()->setDrawsContent(m_drawsContent && m_contentsVisible);
    m_layer->layer()->setWebLayerClient(this);
    m_layer->setAutomaticallyComputeRasterScale(true);
}

GraphicsLayer::~GraphicsLayer()
{
    for (size_t i = 0; i < m_linkHighlights.size(); ++i)
        m_linkHighlights[i]->clearCurrentGraphicsLayer();
    m_linkHighlights.clear();

#ifndef NDEBUG
    if (m_client)
        m_client->verifyNotPainting();
#endif

    if (m_replicaLayer)
        m_replicaLayer->setReplicatedLayer(0);

    if (m_replicatedLayer)
        m_replicatedLayer->setReplicatedByLayer(0);

    removeAllChildren();
    removeFromParent();

    resetTrackedRepaints();
    ASSERT(!m_parent);
}

void GraphicsLayer::setParent(GraphicsLayer* layer)
{
    ASSERT(!layer || !layer->hasAncestor(this));
    m_parent = layer;
}

bool GraphicsLayer::hasAncestor(GraphicsLayer* ancestor) const
{
    for (GraphicsLayer* curr = parent(); curr; curr = curr->parent()) {
        if (curr == ancestor)
            return true;
    }

    return false;
}

bool GraphicsLayer::setChildren(const GraphicsLayerVector& newChildren)
{
    // If the contents of the arrays are the same, nothing to do.
    if (newChildren == m_children)
        return false;

    removeAllChildren();

    size_t listSize = newChildren.size();
    for (size_t i = 0; i < listSize; ++i)
        addChildInternal(newChildren[i]);

    updateChildList();

    return true;
}

void GraphicsLayer::addChildInternal(GraphicsLayer* childLayer)
{
    ASSERT(childLayer != this);

    if (childLayer->parent())
        childLayer->removeFromParent();

    childLayer->setParent(this);
    m_children.append(childLayer);

    // Don't call updateChildList here, this function is used in cases where it
    // should not be called until all children are processed.
}

void GraphicsLayer::addChild(GraphicsLayer* childLayer)
{
    addChildInternal(childLayer);
    updateChildList();
}

void GraphicsLayer::addChildAtIndex(GraphicsLayer* childLayer, int index)
{
    ASSERT(childLayer != this);

    if (childLayer->parent())
        childLayer->removeFromParent();

    childLayer->setParent(this);
    m_children.insert(index, childLayer);

    updateChildList();
}

void GraphicsLayer::addChildBelow(GraphicsLayer* childLayer, GraphicsLayer* sibling)
{
    ASSERT(childLayer != this);
    childLayer->removeFromParent();

    bool found = false;
    for (unsigned i = 0; i < m_children.size(); i++) {
        if (sibling == m_children[i]) {
            m_children.insert(i, childLayer);
            found = true;
            break;
        }
    }

    childLayer->setParent(this);

    if (!found)
        m_children.append(childLayer);

    updateChildList();
}

void GraphicsLayer::addChildAbove(GraphicsLayer* childLayer, GraphicsLayer* sibling)
{
    childLayer->removeFromParent();
    ASSERT(childLayer != this);

    bool found = false;
    for (unsigned i = 0; i < m_children.size(); i++) {
        if (sibling == m_children[i]) {
            m_children.insert(i+1, childLayer);
            found = true;
            break;
        }
    }

    childLayer->setParent(this);

    if (!found)
        m_children.append(childLayer);

    updateChildList();
}

bool GraphicsLayer::replaceChild(GraphicsLayer* oldChild, GraphicsLayer* newChild)
{
    ASSERT(!newChild->parent());
    bool found = false;
    for (unsigned i = 0; i < m_children.size(); i++) {
        if (oldChild == m_children[i]) {
            m_children[i] = newChild;
            found = true;
            break;
        }
    }

    if (found) {
        oldChild->setParent(0);

        newChild->removeFromParent();
        newChild->setParent(this);

        updateChildList();
        return true;
    }

    return false;
}

void GraphicsLayer::removeAllChildren()
{
    while (!m_children.isEmpty()) {
        GraphicsLayer* curLayer = m_children.last();
        ASSERT(curLayer->parent());
        curLayer->removeFromParent();
    }
}

void GraphicsLayer::removeFromParent()
{
    if (m_parent) {
        // We use reverseFind so that removeAllChildren() isn't n^2.
        m_parent->m_children.remove(m_parent->m_children.reverseFind(this));
        setParent(0);
    }

    platformLayer()->removeFromParent();
}

void GraphicsLayer::setReplicatedByLayer(GraphicsLayer* layer)
{
    // FIXME: this could probably be a full early exit.
    if (m_replicaLayer != layer) {
        if (m_replicaLayer)
            m_replicaLayer->setReplicatedLayer(0);

        if (layer)
            layer->setReplicatedLayer(this);

        m_replicaLayer = layer;
    }

    WebLayer* webReplicaLayer = layer ? layer->platformLayer() : 0;
    platformLayer()->setReplicaLayer(webReplicaLayer);
}

void GraphicsLayer::setOffsetFromRenderer(const IntSize& offset, ShouldSetNeedsDisplay shouldSetNeedsDisplay)
{
    if (offset == m_offsetFromRenderer)
        return;

    m_offsetFromRenderer = offset;

    // If the compositing layer offset changes, we need to repaint.
    if (shouldSetNeedsDisplay == SetNeedsDisplay)
        setNeedsDisplay();
}

void GraphicsLayer::paintGraphicsLayerContents(GraphicsContext& context, const IntRect& clip)
{
    if (!m_client)
        return;
    incrementPaintCount();
    m_client->paintContents(this, context, m_paintingPhase, clip);
}

void GraphicsLayer::setZPosition(float position)
{
    m_zPosition = position;
}

void GraphicsLayer::updateChildList()
{
    WebLayer* childHost = m_layer->layer();
    childHost->removeAllChildren();

    clearContentsLayerIfUnregistered();

    if (m_contentsLayer) {
        // FIXME: add the contents layer in the correct order with negative z-order children.
        // This does not cause visible rendering issues because currently contents layers are only used
        // for replaced elements that don't have children.
        childHost->addChild(m_contentsLayer);
    }

    for (size_t i = 0; i < m_children.size(); ++i)
        childHost->addChild(m_children[i]->platformLayer());

    for (size_t i = 0; i < m_linkHighlights.size(); ++i)
        childHost->addChild(m_linkHighlights[i]->layer());
}

void GraphicsLayer::updateLayerIsDrawable()
{
    // For the rest of the accelerated compositor code, there is no reason to make a
    // distinction between drawsContent and contentsVisible. So, for m_layer->layer(), these two
    // flags are combined here. m_contentsLayer shouldn't receive the drawsContent flag
    // so it is only given contentsVisible.

    m_layer->layer()->setDrawsContent(m_drawsContent && m_contentsVisible);
    if (WebLayer* contentsLayer = contentsLayerIfRegistered())
        contentsLayer->setDrawsContent(m_contentsVisible);

    if (m_drawsContent) {
        m_layer->layer()->invalidate();
        for (size_t i = 0; i < m_linkHighlights.size(); ++i)
            m_linkHighlights[i]->invalidate();
    }
}

void GraphicsLayer::updateContentsRect()
{
    WebLayer* contentsLayer = contentsLayerIfRegistered();
    if (!contentsLayer)
        return;

    contentsLayer->setPosition(FloatPoint(m_contentsRect.x(), m_contentsRect.y()));
    contentsLayer->setBounds(IntSize(m_contentsRect.width(), m_contentsRect.height()));

    if (m_contentsClippingMaskLayer) {
        if (m_contentsClippingMaskLayer->size() != m_contentsRect.size()) {
            m_contentsClippingMaskLayer->setSize(m_contentsRect.size());
            m_contentsClippingMaskLayer->setNeedsDisplay();
        }
        m_contentsClippingMaskLayer->setPosition(FloatPoint());
        m_contentsClippingMaskLayer->setOffsetFromRenderer(offsetFromRenderer() + IntSize(m_contentsRect.location().x(), m_contentsRect.location().y()));
    }
}

static HashSet<int>* s_registeredLayerSet;

void GraphicsLayer::registerContentsLayer(WebLayer* layer)
{
    if (!s_registeredLayerSet)
        s_registeredLayerSet = new HashSet<int>;
    if (s_registeredLayerSet->contains(layer->id()))
        CRASH();
    s_registeredLayerSet->add(layer->id());
}

void GraphicsLayer::unregisterContentsLayer(WebLayer* layer)
{
    ASSERT(s_registeredLayerSet);
    if (!s_registeredLayerSet->contains(layer->id()))
        CRASH();
    s_registeredLayerSet->remove(layer->id());
}

void GraphicsLayer::setContentsTo(WebLayer* layer)
{
    bool childrenChanged = false;
    if (layer) {
        ASSERT(s_registeredLayerSet);
        if (!s_registeredLayerSet->contains(layer->id()))
            CRASH();
        if (m_contentsLayerId != layer->id()) {
            setupContentsLayer(layer);
            childrenChanged = true;
        }
        updateContentsRect();
    } else {
        if (m_contentsLayer) {
            childrenChanged = true;

            // The old contents layer will be removed via updateChildList.
            m_contentsLayer = 0;
            m_contentsLayerId = 0;
        }
    }

    if (childrenChanged)
        updateChildList();
}

void GraphicsLayer::setupContentsLayer(WebLayer* contentsLayer)
{
    ASSERT(contentsLayer);
    m_contentsLayer = contentsLayer;
    m_contentsLayerId = m_contentsLayer->id();

    m_contentsLayer->setWebLayerClient(this);
    m_contentsLayer->setAnchorPoint(FloatPoint(0, 0));
    m_contentsLayer->setUseParentBackfaceVisibility(true);

    // It is necessary to call setDrawsContent as soon as we receive the new contentsLayer, for
    // the correctness of early exit conditions in setDrawsContent() and setContentsVisible().
    m_contentsLayer->setDrawsContent(m_contentsVisible);

    // Insert the content layer first. Video elements require this, because they have
    // shadow content that must display in front of the video.
    m_layer->layer()->insertChild(m_contentsLayer, 0);
    WebLayer* borderWebLayer = m_contentsClippingMaskLayer ? m_contentsClippingMaskLayer->platformLayer() : 0;
    m_contentsLayer->setMaskLayer(borderWebLayer);

    m_contentsLayer->setRenderingContext(m_3dRenderingContext);
}

void GraphicsLayer::clearContentsLayerIfUnregistered()
{
    if (!m_contentsLayerId || s_registeredLayerSet->contains(m_contentsLayerId))
        return;

    m_contentsLayer = 0;
    m_contentsLayerId = 0;
}

GraphicsLayerDebugInfo& GraphicsLayer::debugInfo()
{
    return m_debugInfo;
}

blink::WebGraphicsLayerDebugInfo* GraphicsLayer::takeDebugInfoFor(WebLayer* layer)
{
    GraphicsLayerDebugInfo* clone = m_debugInfo.clone();
    clone->setDebugName(debugName(layer));
    return clone;
}

WebLayer* GraphicsLayer::contentsLayerIfRegistered()
{
    clearContentsLayerIfUnregistered();
    return m_contentsLayer;
}

void GraphicsLayer::resetTrackedRepaints()
{
    repaintRectMap().remove(this);
}

void GraphicsLayer::addRepaintRect(const FloatRect& repaintRect)
{
    if (m_client->isTrackingRepaints()) {
        FloatRect largestRepaintRect(FloatPoint(), m_size);
        largestRepaintRect.intersect(repaintRect);
        RepaintMap::iterator repaintIt = repaintRectMap().find(this);
        if (repaintIt == repaintRectMap().end()) {
            Vector<FloatRect> repaintRects;
            repaintRects.append(largestRepaintRect);
            repaintRectMap().set(this, repaintRects);
        } else {
            Vector<FloatRect>& repaintRects = repaintIt->value;
            repaintRects.append(largestRepaintRect);
        }
    }
}

void GraphicsLayer::collectTrackedRepaintRects(Vector<FloatRect>& rects) const
{
    if (!m_client->isTrackingRepaints())
        return;

    RepaintMap::iterator repaintIt = repaintRectMap().find(this);
    if (repaintIt != repaintRectMap().end())
        rects.appendVector(repaintIt->value);
}

void GraphicsLayer::dumpLayer(TextStream& ts, int indent, LayerTreeFlags flags, RenderingContextMap& renderingContextMap) const
{
    writeIndent(ts, indent);
    ts << "(" << "GraphicsLayer";

    if (flags & LayerTreeIncludesDebugInfo) {
        ts << " " << static_cast<void*>(const_cast<GraphicsLayer*>(this));
        ts << " \"" << m_client->debugName(this) << "\"";
    }

    ts << "\n";
    dumpProperties(ts, indent, flags, renderingContextMap);
    writeIndent(ts, indent);
    ts << ")\n";
}

void GraphicsLayer::dumpProperties(TextStream& ts, int indent, LayerTreeFlags flags, RenderingContextMap& renderingContextMap) const
{
    if (m_position != FloatPoint()) {
        writeIndent(ts, indent + 1);
        ts << "(position " << m_position.x() << " " << m_position.y() << ")\n";
    }

    if (m_boundsOrigin != FloatPoint()) {
        writeIndent(ts, indent + 1);
        ts << "(bounds origin " << m_boundsOrigin.x() << " " << m_boundsOrigin.y() << ")\n";
    }

    if (m_anchorPoint != FloatPoint3D(0.5f, 0.5f, 0)) {
        writeIndent(ts, indent + 1);
        ts << "(anchor " << m_anchorPoint.x() << " " << m_anchorPoint.y() << ")\n";
    }

    if (m_size != IntSize()) {
        writeIndent(ts, indent + 1);
        ts << "(bounds " << m_size.width() << " " << m_size.height() << ")\n";
    }

    if (m_opacity != 1) {
        writeIndent(ts, indent + 1);
        ts << "(opacity " << m_opacity << ")\n";
    }

    if (m_blendMode != blink::WebBlendModeNormal) {
        writeIndent(ts, indent + 1);
        ts << "(blendMode " << compositeOperatorName(CompositeSourceOver, m_blendMode) << ")\n";
    }

    if (m_isRootForIsolatedGroup) {
        writeIndent(ts, indent + 1);
        ts << "(isolate " << m_isRootForIsolatedGroup << ")\n";
    }

    if (m_contentsOpaque) {
        writeIndent(ts, indent + 1);
        ts << "(contentsOpaque " << m_contentsOpaque << ")\n";
    }

    if (!m_shouldFlattenTransform) {
        writeIndent(ts, indent + 1);
        ts << "(shouldFlattenTransform " << m_shouldFlattenTransform << ")\n";
    }

    if (m_3dRenderingContext) {
        RenderingContextMap::const_iterator it = renderingContextMap.find(m_3dRenderingContext);
        int contextId = renderingContextMap.size() + 1;
        if (it == renderingContextMap.end())
            renderingContextMap.set(m_3dRenderingContext, contextId);
        else
            contextId = it->value;

        writeIndent(ts, indent + 1);
        ts << "(3dRenderingContext " << contextId << ")\n";
    }

    if (m_drawsContent) {
        writeIndent(ts, indent + 1);
        ts << "(drawsContent " << m_drawsContent << ")\n";
    }

    if (!m_contentsVisible) {
        writeIndent(ts, indent + 1);
        ts << "(contentsVisible " << m_contentsVisible << ")\n";
    }

    if (m_hasGpuRasterizationHint) {
        writeIndent(ts, indent + 1);
        ts << "(hasGpuRasterizationHint " << m_hasGpuRasterizationHint << ")\n";
    }

    if (!m_backfaceVisibility) {
        writeIndent(ts, indent + 1);
        ts << "(backfaceVisibility " << (m_backfaceVisibility ? "visible" : "hidden") << ")\n";
    }

    if (flags & LayerTreeIncludesDebugInfo) {
        writeIndent(ts, indent + 1);
        ts << "(";
        if (m_client)
            ts << "client " << static_cast<void*>(m_client);
        else
            ts << "no client";
        ts << ")\n";
    }

    if (m_backgroundColor.alpha()) {
        writeIndent(ts, indent + 1);
        ts << "(backgroundColor " << m_backgroundColor.nameForRenderTreeAsText() << ")\n";
    }

    if (!m_transform.isIdentity()) {
        writeIndent(ts, indent + 1);
        ts << "(transform ";
        ts << "[" << m_transform.m11() << " " << m_transform.m12() << " " << m_transform.m13() << " " << m_transform.m14() << "] ";
        ts << "[" << m_transform.m21() << " " << m_transform.m22() << " " << m_transform.m23() << " " << m_transform.m24() << "] ";
        ts << "[" << m_transform.m31() << " " << m_transform.m32() << " " << m_transform.m33() << " " << m_transform.m34() << "] ";
        ts << "[" << m_transform.m41() << " " << m_transform.m42() << " " << m_transform.m43() << " " << m_transform.m44() << "])\n";
    }

    if (m_replicaLayer) {
        writeIndent(ts, indent + 1);
        ts << "(replica layer";
        if (flags & LayerTreeIncludesDebugInfo)
            ts << " " << m_replicaLayer;
        ts << ")\n";
        m_replicaLayer->dumpLayer(ts, indent + 2, flags, renderingContextMap);
    }

    if (m_replicatedLayer) {
        writeIndent(ts, indent + 1);
        ts << "(replicated layer";
        if (flags & LayerTreeIncludesDebugInfo)
            ts << " " << m_replicatedLayer;
        ts << ")\n";
    }

    if ((flags & LayerTreeIncludesRepaintRects) && repaintRectMap().contains(this) && !repaintRectMap().get(this).isEmpty()) {
        writeIndent(ts, indent + 1);
        ts << "(repaint rects\n";
        for (size_t i = 0; i < repaintRectMap().get(this).size(); ++i) {
            if (repaintRectMap().get(this)[i].isEmpty())
                continue;
            writeIndent(ts, indent + 2);
            ts << "(rect ";
            ts << repaintRectMap().get(this)[i].x() << " ";
            ts << repaintRectMap().get(this)[i].y() << " ";
            ts << repaintRectMap().get(this)[i].width() << " ";
            ts << repaintRectMap().get(this)[i].height();
            ts << ")\n";
        }
        writeIndent(ts, indent + 1);
        ts << ")\n";
    }

    if ((flags & LayerTreeIncludesPaintingPhases) && paintingPhase()) {
        writeIndent(ts, indent + 1);
        ts << "(paintingPhases\n";
        if (paintingPhase() & GraphicsLayerPaintBackground) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintBackground\n";
        }
        if (paintingPhase() & GraphicsLayerPaintForeground) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintForeground\n";
        }
        if (paintingPhase() & GraphicsLayerPaintMask) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintMask\n";
        }
        if (paintingPhase() & GraphicsLayerPaintChildClippingMask) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintChildClippingMask\n";
        }
        if (paintingPhase() & GraphicsLayerPaintOverflowContents) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintOverflowContents\n";
        }
        if (paintingPhase() & GraphicsLayerPaintCompositedScroll) {
            writeIndent(ts, indent + 2);
            ts << "GraphicsLayerPaintCompositedScroll\n";
        }
        writeIndent(ts, indent + 1);
        ts << ")\n";
    }

    if (flags & LayerTreeIncludesClipAndScrollParents) {
        if (m_hasScrollParent) {
            writeIndent(ts, indent + 1);
            ts << "(hasScrollParent 1)\n";
        }
        if (m_hasClipParent) {
            writeIndent(ts, indent + 1);
            ts << "(hasClipParent 1)\n";
        }
    }

    if (flags & LayerTreeIncludesDebugInfo) {
        writeIndent(ts, indent + 1);
        ts << "(compositingReasons\n";
        for (size_t i = 0; i < WTF_ARRAY_LENGTH(compositingReasonStringMap); ++i) {
            if (m_debugInfo.compositingReasons() & compositingReasonStringMap[i].reason) {
                writeIndent(ts, indent + 2);
                ts << compositingReasonStringMap[i].description << "\n";
            }
        }
        writeIndent(ts, indent + 1);
        ts << ")\n";
    }

    if (m_children.size()) {
        writeIndent(ts, indent + 1);
        ts << "(children " << m_children.size() << "\n";

        unsigned i;
        for (i = 0; i < m_children.size(); i++)
            m_children[i]->dumpLayer(ts, indent + 2, flags, renderingContextMap);
        writeIndent(ts, indent + 1);
        ts << ")\n";
    }
}

String GraphicsLayer::layerTreeAsText(LayerTreeFlags flags) const
{
    TextStream ts;

    RenderingContextMap renderingContextMap;
    dumpLayer(ts, 0, flags, renderingContextMap);
    return ts.release();
}

String GraphicsLayer::debugName(blink::WebLayer* webLayer) const
{
    String name;
    if (!m_client)
        return name;

    String highlightDebugName;
    for (size_t i = 0; i < m_linkHighlights.size(); ++i) {
        if (webLayer == m_linkHighlights[i]->layer()) {
            highlightDebugName = "LinkHighlight[" + String::number(i) + "] for " + m_client->debugName(this);
            break;
        }
    }

    if (webLayer == m_contentsLayer) {
        name = "ContentsLayer for " + m_client->debugName(this);
    } else if (!highlightDebugName.isEmpty()) {
        name = highlightDebugName;
    } else if (webLayer == m_layer->layer()) {
        name = m_client->debugName(this);
    } else {
        ASSERT_NOT_REACHED();
    }
    return name;
}

void GraphicsLayer::setCompositingReasons(CompositingReasons reasons)
{
    m_debugInfo.setCompositingReasons(reasons);
}

void GraphicsLayer::setPosition(const FloatPoint& point)
{
    m_position = point;
    platformLayer()->setPosition(m_position);
}

void GraphicsLayer::setAnchorPoint(const FloatPoint3D& point)
{
    m_anchorPoint = point;
    platformLayer()->setAnchorPoint(FloatPoint(m_anchorPoint.x(), m_anchorPoint.y()));
    platformLayer()->setAnchorPointZ(m_anchorPoint.z());
}

void GraphicsLayer::setSize(const FloatSize& size)
{
    // We are receiving negative sizes here that cause assertions to fail in the compositor. Clamp them to 0 to
    // avoid those assertions.
    // FIXME: This should be an ASSERT instead, as negative sizes should not exist in WebCore.
    FloatSize clampedSize = size;
    if (clampedSize.width() < 0 || clampedSize.height() < 0)
        clampedSize = FloatSize();

    if (clampedSize == m_size)
        return;

    m_size = clampedSize;

    m_layer->layer()->setBounds(flooredIntSize(m_size));
    // Note that we don't resize m_contentsLayer. It's up the caller to do that.
}

void GraphicsLayer::setTransform(const TransformationMatrix& transform)
{
    m_transform = transform;
    platformLayer()->setTransform(TransformationMatrix::toSkMatrix44(m_transform));
}

void GraphicsLayer::setShouldFlattenTransform(bool shouldFlatten)
{
    if (shouldFlatten == m_shouldFlattenTransform)
        return;

    m_shouldFlattenTransform = shouldFlatten;

    m_layer->layer()->setShouldFlattenTransform(shouldFlatten);
}

void GraphicsLayer::setRenderingContext(int context)
{
    if (m_3dRenderingContext == context)
        return;

    m_3dRenderingContext = context;
    m_layer->layer()->setRenderingContext(context);

    if (m_contentsLayer)
        m_contentsLayer->setRenderingContext(m_3dRenderingContext);
}

void GraphicsLayer::setMasksToBounds(bool masksToBounds)
{
    m_masksToBounds = masksToBounds;
    m_layer->layer()->setMasksToBounds(m_masksToBounds);
}

void GraphicsLayer::setDrawsContent(bool drawsContent)
{
    // Note carefully this early-exit is only correct because we also properly call
    // WebLayer::setDrawsContent whenever m_contentsLayer is set to a new layer in setupContentsLayer().
    if (drawsContent == m_drawsContent)
        return;

    m_drawsContent = drawsContent;
    updateLayerIsDrawable();
}

void GraphicsLayer::setContentsVisible(bool contentsVisible)
{
    // Note carefully this early-exit is only correct because we also properly call
    // WebLayer::setDrawsContent whenever m_contentsLayer is set to a new layer in setupContentsLayer().
    if (contentsVisible == m_contentsVisible)
        return;

    m_contentsVisible = contentsVisible;
    updateLayerIsDrawable();
}

void GraphicsLayer::setClipParent(blink::WebLayer* parent)
{
    m_hasClipParent = !!parent;
    m_layer->layer()->setClipParent(parent);
}

void GraphicsLayer::setScrollParent(blink::WebLayer* parent)
{
    m_hasScrollParent = !!parent;
    m_layer->layer()->setScrollParent(parent);
}

void GraphicsLayer::setBackgroundColor(const Color& color)
{
    if (color == m_backgroundColor)
        return;

    m_backgroundColor = color;
    m_layer->layer()->setBackgroundColor(m_backgroundColor.rgb());
}

void GraphicsLayer::setContentsOpaque(bool opaque)
{
    m_contentsOpaque = opaque;
    m_layer->layer()->setOpaque(m_contentsOpaque);
    m_opaqueRectTrackingContentLayerDelegate->setOpaque(m_contentsOpaque);
}

void GraphicsLayer::setMaskLayer(GraphicsLayer* maskLayer)
{
    if (maskLayer == m_maskLayer)
        return;

    m_maskLayer = maskLayer;
    WebLayer* maskWebLayer = m_maskLayer ? m_maskLayer->platformLayer() : 0;
    m_layer->layer()->setMaskLayer(maskWebLayer);
}

void GraphicsLayer::setContentsClippingMaskLayer(GraphicsLayer* contentsClippingMaskLayer)
{
    if (contentsClippingMaskLayer == m_contentsClippingMaskLayer)
        return;

    m_contentsClippingMaskLayer = contentsClippingMaskLayer;
    WebLayer* contentsLayer = contentsLayerIfRegistered();
    if (!contentsLayer)
        return;
    WebLayer* contentsClippingMaskWebLayer = m_contentsClippingMaskLayer ? m_contentsClippingMaskLayer->platformLayer() : 0;
    contentsLayer->setMaskLayer(contentsClippingMaskWebLayer);
    updateContentsRect();
}

void GraphicsLayer::setBackfaceVisibility(bool visible)
{
    m_backfaceVisibility = visible;
    m_layer->setDoubleSided(m_backfaceVisibility);
}

void GraphicsLayer::setOpacity(float opacity)
{
    float clampedOpacity = std::max(std::min(opacity, 1.0f), 0.0f);
    m_opacity = clampedOpacity;
    platformLayer()->setOpacity(opacity);
}

void GraphicsLayer::setBlendMode(blink::WebBlendMode blendMode)
{
    if (m_blendMode == blendMode)
        return;
    m_blendMode = blendMode;
    platformLayer()->setBlendMode(blink::WebBlendMode(blendMode));
}

void GraphicsLayer::setIsRootForIsolatedGroup(bool isolated)
{
    if (m_isRootForIsolatedGroup == isolated)
        return;
    m_isRootForIsolatedGroup = isolated;
    platformLayer()->setIsRootForIsolatedGroup(isolated);
}

void GraphicsLayer::setHasGpuRasterizationHint(bool hasHint)
{
    m_hasGpuRasterizationHint = hasHint;
    m_layer->setHasGpuRasterizationHint(hasHint);
}

void GraphicsLayer::setContentsNeedsDisplay()
{
    if (WebLayer* contentsLayer = contentsLayerIfRegistered()) {
        contentsLayer->invalidate();
        addRepaintRect(contentsRect());
    }
}

void GraphicsLayer::setNeedsDisplay()
{
    if (drawsContent()) {
        m_layer->layer()->invalidate();
        addRepaintRect(FloatRect(FloatPoint(), m_size));
        for (size_t i = 0; i < m_linkHighlights.size(); ++i)
            m_linkHighlights[i]->invalidate();
    }
}

void GraphicsLayer::setNeedsDisplayInRect(const FloatRect& rect)
{
    if (drawsContent()) {
        m_layer->layer()->invalidateRect(rect);
        addRepaintRect(rect);
        for (size_t i = 0; i < m_linkHighlights.size(); ++i)
            m_linkHighlights[i]->invalidate();
    }
}

void GraphicsLayer::setContentsRect(const IntRect& rect)
{
    if (rect == m_contentsRect)
        return;

    m_contentsRect = rect;
    updateContentsRect();
}

void GraphicsLayer::setContentsToImage(Image* image)
{
    RefPtr<NativeImageSkia> nativeImage = image ? image->nativeImageForCurrentFrame() : nullptr;
    if (nativeImage) {
        if (!m_imageLayer) {
            m_imageLayer = adoptPtr(Platform::current()->compositorSupport()->createImageLayer());
            registerContentsLayer(m_imageLayer->layer());
        }
        m_imageLayer->setBitmap(nativeImage->bitmap());
        m_imageLayer->layer()->setOpaque(image->currentFrameKnownToBeOpaque());
        updateContentsRect();
    } else {
        if (m_imageLayer) {
            unregisterContentsLayer(m_imageLayer->layer());
            m_imageLayer.clear();
        }
    }

    setContentsTo(m_imageLayer ? m_imageLayer->layer() : 0);
}

void GraphicsLayer::setContentsToNinePatch(Image* image, const IntRect& aperture)
{
    if (m_ninePatchLayer) {
        unregisterContentsLayer(m_ninePatchLayer->layer());
        m_ninePatchLayer.clear();
    }
    RefPtr<NativeImageSkia> nativeImage = image ? image->nativeImageForCurrentFrame() : nullptr;
    if (nativeImage) {
        m_ninePatchLayer = adoptPtr(Platform::current()->compositorSupport()->createNinePatchLayer());
        m_ninePatchLayer->setBitmap(nativeImage->bitmap(), aperture);
        m_ninePatchLayer->layer()->setOpaque(image->currentFrameKnownToBeOpaque());
        registerContentsLayer(m_ninePatchLayer->layer());
    }
    setContentsTo(m_ninePatchLayer ? m_ninePatchLayer->layer() : 0);
}

bool GraphicsLayer::addAnimation(PassOwnPtr<WebAnimation> popAnimation)
{
    OwnPtr<WebAnimation> animation(popAnimation);
    ASSERT(animation);
    platformLayer()->setAnimationDelegate(this);

    // Remove any existing animations with the same animation id and target property.
    platformLayer()->removeAnimation(animation->id(), animation->targetProperty());
    return platformLayer()->addAnimation(animation.leakPtr());
}

void GraphicsLayer::pauseAnimation(int animationId, double timeOffset)
{
    platformLayer()->pauseAnimation(animationId, timeOffset);
}

void GraphicsLayer::removeAnimation(int animationId)
{
    platformLayer()->removeAnimation(animationId);
}

WebLayer* GraphicsLayer::platformLayer() const
{
    return m_layer->layer();
}

static bool copyWebCoreFilterOperationsToWebFilterOperations(const FilterOperations& filters, WebFilterOperations& webFilters)
{
    for (size_t i = 0; i < filters.size(); ++i) {
        const FilterOperation& op = *filters.at(i);
        switch (op.type()) {
        case FilterOperation::REFERENCE:
            return false; // Not supported.
        case FilterOperation::GRAYSCALE:
        case FilterOperation::SEPIA:
        case FilterOperation::SATURATE:
        case FilterOperation::HUE_ROTATE: {
            float amount = toBasicColorMatrixFilterOperation(op).amount();
            switch (op.type()) {
            case FilterOperation::GRAYSCALE:
                webFilters.appendGrayscaleFilter(amount);
                break;
            case FilterOperation::SEPIA:
                webFilters.appendSepiaFilter(amount);
                break;
            case FilterOperation::SATURATE:
                webFilters.appendSaturateFilter(amount);
                break;
            case FilterOperation::HUE_ROTATE:
                webFilters.appendHueRotateFilter(amount);
                break;
            default:
                ASSERT_NOT_REACHED();
            }
            break;
        }
        case FilterOperation::INVERT:
        case FilterOperation::OPACITY:
        case FilterOperation::BRIGHTNESS:
        case FilterOperation::CONTRAST: {
            float amount = toBasicComponentTransferFilterOperation(op).amount();
            switch (op.type()) {
            case FilterOperation::INVERT:
                webFilters.appendInvertFilter(amount);
                break;
            case FilterOperation::OPACITY:
                webFilters.appendOpacityFilter(amount);
                break;
            case FilterOperation::BRIGHTNESS:
                webFilters.appendBrightnessFilter(amount);
                break;
            case FilterOperation::CONTRAST:
                webFilters.appendContrastFilter(amount);
                break;
            default:
                ASSERT_NOT_REACHED();
            }
            break;
        }
        case FilterOperation::BLUR: {
            float pixelRadius = toBlurFilterOperation(op).stdDeviation().getFloatValue();
            webFilters.appendBlurFilter(pixelRadius);
            break;
        }
        case FilterOperation::DROP_SHADOW: {
            const DropShadowFilterOperation& dropShadowOp = toDropShadowFilterOperation(op);
            webFilters.appendDropShadowFilter(WebPoint(dropShadowOp.x(), dropShadowOp.y()), dropShadowOp.stdDeviation(), dropShadowOp.color().rgb());
            break;
        }
        case FilterOperation::CUSTOM:
        case FilterOperation::VALIDATED_CUSTOM:
            return false; // Not supported.
        case FilterOperation::NONE:
            break;
        }
    }
    return true;
}

bool GraphicsLayer::setFilters(const FilterOperations& filters)
{
    SkiaImageFilterBuilder builder;
    OwnPtr<WebFilterOperations> webFilters = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
    FilterOutsets outsets = filters.outsets();
    builder.setCropOffset(FloatSize(outsets.left(), outsets.top()));
    if (!builder.buildFilterOperations(filters, webFilters.get())) {
        // Make sure the filters are removed from the platform layer, as they are
        // going to fallback to software mode.
        webFilters->clear();
        m_layer->layer()->setFilters(*webFilters);
        m_filters = FilterOperations();
        return false;
    }

    m_layer->layer()->setFilters(*webFilters);
    m_filters = filters;
    return true;
}

void GraphicsLayer::setBackgroundFilters(const FilterOperations& filters)
{
    OwnPtr<WebFilterOperations> webFilters = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
    if (!copyWebCoreFilterOperationsToWebFilterOperations(filters, *webFilters))
        return;
    m_layer->layer()->setBackgroundFilters(*webFilters);
}

void GraphicsLayer::addLinkHighlight(LinkHighlightClient* linkHighlight)
{
    ASSERT(linkHighlight && !m_linkHighlights.contains(linkHighlight));
    m_linkHighlights.append(linkHighlight);
    linkHighlight->layer()->setWebLayerClient(this);
    updateChildList();
}

void GraphicsLayer::removeLinkHighlight(LinkHighlightClient* linkHighlight)
{
    m_linkHighlights.remove(m_linkHighlights.find(linkHighlight));
    updateChildList();
}

void GraphicsLayer::setScrollableArea(ScrollableArea* scrollableArea, bool isMainFrame)
{
    if (m_scrollableArea == scrollableArea)
        return;

    m_scrollableArea = scrollableArea;

    // Main frame scrolling may involve pinch zoom and gets routed through
    // WebViewImpl explicitly rather than via GraphicsLayer::didScroll.
    // TODO(bokan): With pinch virtual viewport the special case will no
    // longer be needed, remove once old-style pinch is gone.
    if (isMainFrame)
        m_layer->layer()->setScrollClient(0);
    else
        m_layer->layer()->setScrollClient(this);
}

void GraphicsLayer::paint(GraphicsContext& context, const IntRect& clip)
{
    paintGraphicsLayerContents(context, clip);
}


void GraphicsLayer::notifyAnimationStarted(double monotonicTime, WebAnimation::TargetProperty)
{
    if (m_client)
        m_client->notifyAnimationStarted(this, monotonicTime);
}

void GraphicsLayer::notifyAnimationFinished(double, WebAnimation::TargetProperty)
{
    // Do nothing.
}

void GraphicsLayer::didScroll()
{
    if (m_scrollableArea)
        m_scrollableArea->scrollToOffsetWithoutAnimation(m_scrollableArea->minimumScrollPosition() + toIntSize(m_layer->layer()->scrollPosition()));
}

} // namespace WebCore

#ifndef NDEBUG
void showGraphicsLayerTree(const WebCore::GraphicsLayer* layer)
{
    if (!layer)
        return;

    String output = layer->layerTreeAsText(WebCore::LayerTreeIncludesDebugInfo);
    fprintf(stderr, "%s\n", output.utf8().data());
}
#endif
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root/Source/platform/graphics/GraphicsLayer.cpp

DEFINITIONS
