renderobject.cpp

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    // We have gone from not affecting the inline status of the parent flow to suddenly
    // having an impact.  See if there is a mismatch between the parent flow's
    // childrenInline() state and our state.
    setInline(style()->isDisplayInlineType());
    if (isInline() != parent()->childrenInline()) {
        if (!isInline())
            toRenderBoxModelObject(parent())->childBecameNonInline(this);
        else {
            // An anonymous block must be made to wrap this inline.
            RenderBlock* block = toRenderBlock(parent())->createAnonymousBlock();
            RenderObjectChildList* childlist = parent()->virtualChildren();
            childlist->insertChildNode(parent(), block, this);
            block->children()->appendChildNode(block, childlist->removeChildNode(parent(), this));
        }
    }
}

void RenderObject::setAnimatableStyle(PassRefPtr<RenderStyle> style)
{
    if (!isText() && style)
        setStyle(animation()->updateAnimations(this, style.get()));
    else
        setStyle(style);
}

StyleDifference RenderObject::adjustStyleDifference(StyleDifference diff, unsigned contextSensitiveProperties) const
{
#if USE(ACCELERATED_COMPOSITING)
    // If transform changed, and we are not composited, need to do a layout.
    if (contextSensitiveProperties & ContextSensitivePropertyTransform)
        // Text nodes share style with their parents but transforms don't apply to them,
        // hence the !isText() check.
        // FIXME: when transforms are taken into account for overflow, we will need to do a layout.
        if (!isText() && (!hasLayer() || !toRenderBoxModelObject(this)->layer()->isComposited()))
            diff = StyleDifferenceLayout;
        else if (diff < StyleDifferenceRecompositeLayer)
            diff = StyleDifferenceRecompositeLayer;

    // If opacity changed, and we are not composited, need to repaint (also
    // ignoring text nodes)
    if (contextSensitiveProperties & ContextSensitivePropertyOpacity)
        if (!isText() && (!hasLayer() || !toRenderBoxModelObject(this)->layer()->isComposited()))
            diff = StyleDifferenceRepaintLayer;
        else if (diff < StyleDifferenceRecompositeLayer)
            diff = StyleDifferenceRecompositeLayer;
#else
    UNUSED_PARAM(contextSensitiveProperties);
#endif

    // If we have no layer(), just treat a RepaintLayer hint as a normal Repaint.
    if (diff == StyleDifferenceRepaintLayer && !hasLayer())
        diff = StyleDifferenceRepaint;

    return diff;
}

void RenderObject::setStyle(PassRefPtr<RenderStyle> style)
{
    if (m_style == style)
        return;

    StyleDifference diff = StyleDifferenceEqual;
    unsigned contextSensitiveProperties = ContextSensitivePropertyNone;
    if (m_style)
        diff = m_style->diff(style.get(), contextSensitiveProperties);

    diff = adjustStyleDifference(diff, contextSensitiveProperties);

    styleWillChange(diff, style.get());
    
    RefPtr<RenderStyle> oldStyle = m_style.release();
    m_style = style;

    updateFillImages(oldStyle ? oldStyle->backgroundLayers() : 0, m_style ? m_style->backgroundLayers() : 0);
    updateFillImages(oldStyle ? oldStyle->maskLayers() : 0, m_style ? m_style->maskLayers() : 0);

    updateImage(oldStyle ? oldStyle->borderImage().image() : 0, m_style ? m_style->borderImage().image() : 0);
    updateImage(oldStyle ? oldStyle->maskBoxImage().image() : 0, m_style ? m_style->maskBoxImage().image() : 0);

    // We need to ensure that view->maximalOutlineSize() is valid for any repaints that happen
    // during styleDidChange (it's used by clippedOverflowRectForRepaint()).
    if (m_style->outlineWidth() > 0 && m_style->outlineSize() > maximalOutlineSize(PaintPhaseOutline))
        toRenderView(document()->renderer())->setMaximalOutlineSize(m_style->outlineSize());

    styleDidChange(diff, oldStyle.get());

    if (!m_parent || isText())
        return;

    // Now that the layer (if any) has been updated, we need to adjust the diff again,
    // check whether we should layout now, and decide if we need to repaint.
    StyleDifference updatedDiff = adjustStyleDifference(diff, contextSensitiveProperties);
    
    if (diff <= StyleDifferenceLayoutPositionedMovementOnly) {
        if (updatedDiff == StyleDifferenceLayout)
            setNeedsLayoutAndPrefWidthsRecalc();
        else if (updatedDiff == StyleDifferenceLayoutPositionedMovementOnly)
            setNeedsPositionedMovementLayout();
    }
    
    if (updatedDiff == StyleDifferenceRepaintLayer || updatedDiff == StyleDifferenceRepaint) {
        // Do a repaint with the new style now, e.g., for example if we go from
        // not having an outline to having an outline.
        repaint();
    }
}

void RenderObject::setStyleInternal(PassRefPtr<RenderStyle> style)
{
    m_style = style;
}

void RenderObject::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
    if (m_style) {
        // If our z-index changes value or our visibility changes,
        // we need to dirty our stacking context's z-order list.
        if (newStyle) {
#if ENABLE(DASHBOARD_SUPPORT)
            if (m_style->visibility() != newStyle->visibility() ||
                    m_style->zIndex() != newStyle->zIndex() ||
                    m_style->hasAutoZIndex() != newStyle->hasAutoZIndex())
                document()->setDashboardRegionsDirty(true);
#endif

            // Keep layer hierarchy visibility bits up to date if visibility changes.
            if (m_style->visibility() != newStyle->visibility()) {
                if (RenderLayer* l = enclosingLayer()) {
                    if (newStyle->visibility() == VISIBLE)
                        l->setHasVisibleContent(true);
                    else if (l->hasVisibleContent() && (this == l->renderer() || l->renderer()->style()->visibility() != VISIBLE)) {
                        l->dirtyVisibleContentStatus();
                        if (diff > StyleDifferenceRepaintLayer)
                            repaint();
                    }
                }
            }
        }

        if (m_parent && (diff == StyleDifferenceRepaint || newStyle->outlineSize() < m_style->outlineSize()))
            repaint();
        if (isFloating() && (m_style->floating() != newStyle->floating()))
            // For changes in float styles, we need to conceivably remove ourselves
            // from the floating objects list.
            toRenderBox(this)->removeFloatingOrPositionedChildFromBlockLists();
        else if (isPositioned() && (newStyle->position() != AbsolutePosition && newStyle->position() != FixedPosition))
            // For changes in positioning styles, we need to conceivably remove ourselves
            // from the positioned objects list.
            toRenderBox(this)->removeFloatingOrPositionedChildFromBlockLists();

        s_affectsParentBlock = isFloatingOrPositioned() &&
            (!newStyle->isFloating() && newStyle->position() != AbsolutePosition && newStyle->position() != FixedPosition)
            && parent() && (parent()->isBlockFlow() || parent()->isRenderInline());

        // reset style flags
        if (diff == StyleDifferenceLayout || diff == StyleDifferenceLayoutPositionedMovementOnly) {
            m_floating = false;
            m_positioned = false;
            m_relPositioned = false;
        }
        m_paintBackground = false;
        m_hasOverflowClip = false;
        m_hasTransform = false;
        m_hasReflection = false;
    } else
        s_affectsParentBlock = false;

    if (view()->frameView()) {
        // FIXME: A better solution would be to only invalidate the fixed regions when scrolling.  It's overkill to
        // prevent the entire view from blitting on a scroll.
        bool newStyleSlowScroll = newStyle && (newStyle->position() == FixedPosition || newStyle->hasFixedBackgroundImage());
        bool oldStyleSlowScroll = m_style && (m_style->position() == FixedPosition || m_style->hasFixedBackgroundImage());
        if (oldStyleSlowScroll != newStyleSlowScroll) {
            if (oldStyleSlowScroll)
                view()->frameView()->removeSlowRepaintObject();
            if (newStyleSlowScroll)
                view()->frameView()->addSlowRepaintObject();
        }
    }
}

void RenderObject::styleDidChange(StyleDifference diff, const RenderStyle*)
{
    if (s_affectsParentBlock)
        handleDynamicFloatPositionChange();

    if (!m_parent)
        return;
    
    if (diff == StyleDifferenceLayout)
        setNeedsLayoutAndPrefWidthsRecalc();
    else if (diff == StyleDifferenceLayoutPositionedMovementOnly)
        setNeedsPositionedMovementLayout();

    // Don't check for repaint here; we need to wait until the layer has been
    // updated by subclasses before we know if we have to repaint (in setStyle()).
}

void RenderObject::updateFillImages(const FillLayer* oldLayers, const FillLayer* newLayers)
{
    // FIXME: This will be slow when a large number of images is used.  Fix by using a dict.
    for (const FillLayer* currOld = oldLayers; currOld; currOld = currOld->next()) {
        if (currOld->image() && (!newLayers || !newLayers->containsImage(currOld->image())))
            currOld->image()->removeClient(this);
    }
    for (const FillLayer* currNew = newLayers; currNew; currNew = currNew->next()) {
        if (currNew->image() && (!oldLayers || !oldLayers->containsImage(currNew->image())))
            currNew->image()->addClient(this);
    }
}

void RenderObject::updateImage(StyleImage* oldImage, StyleImage* newImage)
{
    if (oldImage != newImage) {
        if (oldImage)
            oldImage->removeClient(this);
        if (newImage)
            newImage->addClient(this);
    }
}

IntRect RenderObject::viewRect() const
{
    return view()->viewRect();
}

FloatPoint RenderObject::localToAbsolute(FloatPoint localPoint, bool fixed, bool useTransforms) const
{
    TransformState transformState(TransformState::ApplyTransformDirection, localPoint);
    mapLocalToContainer(0, fixed, useTransforms, transformState);
    transformState.flatten();
    
    return transformState.lastPlanarPoint();
}

FloatPoint RenderObject::absoluteToLocal(FloatPoint containerPoint, bool fixed, bool useTransforms) const
{
    TransformState transformState(TransformState::UnapplyInverseTransformDirection, containerPoint);
    mapAbsoluteToLocalPoint(fixed, useTransforms, transformState);
    transformState.flatten();
    
    return transformState.lastPlanarPoint();
}

void RenderObject::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState& transformState) const
{
    if (repaintContainer == this)
        return;

    RenderObject* o = parent();
    if (!o)
        return;

    if (o->hasOverflowClip())
        transformState.move(-toRenderBox(o)->layer()->scrolledContentOffset());

    o->mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
}

void RenderObject::mapAbsoluteToLocalPoint(bool fixed, bool useTransforms, TransformState& transformState) const
{
    RenderObject* o = parent();
    if (o) {
        o->mapAbsoluteToLocalPoint(fixed, useTransforms, transformState);
        if (o->hasOverflowClip())
            transformState.move(toRenderBox(o)->layer()->scrolledContentOffset());
    }
}

TransformationMatrix RenderObject::transformFromContainer(const RenderObject* containerObject, const IntSize& offsetInContainer) const
{
    TransformationMatrix containerTransform;
    containerTransform.translate(offsetInContainer.width(), offsetInContainer.height());
    RenderLayer* layer;
    if (hasLayer() && (layer = toRenderBox(this)->layer()) && layer->transform())
        containerTransform.multLeft(layer->currentTransform());
    
    if (containerObject && containerObject->style()->hasPerspective()) {
        // Perpsective on the container affects us, so we have to factor it in here.
        ASSERT(containerObject->hasLayer());
        FloatPoint perspectiveOrigin = toRenderBox(containerObject)->layer()->perspectiveOrigin();

        TransformationMatrix perspectiveMatrix;
        perspectiveMatrix.applyPerspective(containerObject->style()->perspective());
        
        containerTransform.translateRight3d(-perspectiveOrigin.x(), -perspectiveOrigin.y(), 0);
        containerTransform.multiply(perspectiveMatrix);
        containerTransform.translateRight3d(perspectiveOrigin.x(), perspectiveOrigin.y(), 0);
    }

    return containerTransform;
}

FloatQuad RenderObject::localToContainerQuad(const FloatQuad& localQuad, RenderBoxModelObject* repaintContainer, bool fixed) const
{
    TransformState transformState(TransformState::ApplyTransformDirection, FloatPoint(), &localQuad);
    mapLocalToContainer(repaintContainer, fixed, true, transformState);
    transformState.flatten();
    
    return transformState.lastPlanarQuad();
}

IntSize RenderObject::offsetFromContainer(RenderObject* o) const
{
    ASSERT(o == container());

    IntSize offset;
    if (o->hasOverflowClip())
        offset -= toRenderBox(o)->layer()->scrolledContentOffset();

    return offset;
}

IntRect RenderObject::localCaretRect(InlineBox*, int, int* extraWidthToEndOfLine)
{
   if (extraWidthToEndOfLine)
       *extraWidthToEndOfLine = 0;

    return IntRect();
}

RenderView* RenderObject::view() const
{
    return toRenderView(document()->renderer());
}

bool RenderObject::isRooted(RenderView** view)
{
    RenderObject* o = this;
    while (o->parent())
        o = o->parent();

    if (!o->isRenderView())
        return false;

    if (view)
        *view = toRenderView(o);

    return true;
}

bool RenderObject::hasOutlineAnnotation() const
{
    return node() && node()->isLink() && document()->printing();
}

RenderObject* RenderObject::container() const
{
    // This method is extremely similar to containingBlock(), but with a few notable
    // exceptions.
    // (1) It can be used on orphaned subtrees, i.e., it can be called safely even when
    // the object is not part of the primary document subtree yet.
    // (2) For normal flow e