Source/WebCore/rendering/svg/RenderSVGRoot.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #include "config.h"

 #if ENABLE(SVG)
 #include "RenderSVGRoot.h"

 #include "Frame.h"
 #include "GraphicsContext.h"
 #include "HitTestResult.h"
 #include "RenderPart.h"
 #include "RenderSVGContainer.h"
 #include "RenderSVGResource.h"
 #include "RenderView.h"
 #include "SVGLength.h"
 #include "SVGRenderSupport.h"
 #include "SVGResources.h"
 #include "SVGSVGElement.h"
 #include "SVGStyledElement.h"
 #include "SVGViewSpec.h"
 #include "TransformState.h"

 #if ENABLE(FILTERS)
 #include "RenderSVGResourceFilter.h"
 #endif

 using namespace std;

 namespace WebCore {

 RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)
     : RenderBox(node)
     , m_isLayoutSizeChanged(false)
     , m_needsBoundariesOrTransformUpdate(true)
     , m_didNegotiateSize(false)
 {
     setReplaced(true);
 }

 RenderSVGRoot::~RenderSVGRoot()
 {
 }

 FloatSize RenderSVGRoot::computeIntrinsicRatio() const
 {
     // Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#IntrinsicSizing
     // The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including
     // SVG from an ‘object’ element in HTML styled with CSS. It is possible (indeed, common) for an SVG
     // graphic to have an intrinsic aspect ratio but not to have an intrinsic width or height.
     // The intrinsic aspect ratio must be calculated based upon the following rules:
     // The aspect ratio is calculated by dividing a width by a height.

     // If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers
     // (in, mm, cm, pt, pc, px, em, ex) or in user units, then the aspect ratio is calculated from the
     // ‘width’ and ‘height’ attributes after resolving both values to user units.
     if (style()->width().isFixed() && style()->height().isFixed())
         return FloatSize(width(), height());

     // If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted),
     // the aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG
     // document fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio
     // cannot be calculated and is considered unspecified.
     return static_cast<SVGSVGElement*>(node())->currentViewBoxRect().size();
 }

 void RenderSVGRoot::computePreferredLogicalWidths()
 {
     ASSERT(preferredLogicalWidthsDirty());

     int borderAndPadding = borderAndPaddingWidth();
     int width = computeReplacedLogicalWidth(false) + borderAndPadding;

     if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
         width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));

     if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {
         m_minPreferredLogicalWidth = 0;
         m_maxPreferredLogicalWidth = width;
     } else
         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = width;

     setPreferredLogicalWidthsDirty(false);
 }

 int RenderSVGRoot::computeIntrinsicWidth(int replacedWidth) const
 {
     if (!style()->width().isPercent())
         return replacedWidth;

     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
     return static_cast<int>(ceilf(replacedWidth * svg->currentScale()));
 }

 int RenderSVGRoot::computeIntrinsicHeight(int replacedHeight) const
 {
     if (!style()->height().isPercent())
         return replacedHeight;

     const SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
     return static_cast<int>(ceilf(replacedHeight * svg->currentScale()));
 }

 void RenderSVGRoot::negotiateSizeWithHostDocumentIfNeeded()
 {
     if (m_didNegotiateSize)
         return;

     Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
     if (!frame)
         return;

     // If our frame has an owner renderer, we're embedded through eg. object/embed.
     // If we're embedded in a host document, we may be loaded after the host document
     // has finished layout. If the <object> doesn't specifiy width/height attributes
     // it has defaulted to 300x150 intrinsic size. If the SVG document has been loaded
     // we notify the RenderPart about the potential size changes, now it can properly
     // synchronize the intrinsic width/height/ratio, as defined in the SVG spec.
     if (RenderPart* ownerRenderer = frame->ownerRenderer()) {
         ownerRenderer->setNeedsLayoutAndPrefWidthsRecalc();
         m_didNegotiateSize = true;
     }
 }

 int RenderSVGRoot::computeReplacedLogicalWidth(bool includeMaxWidth) const
 {
     int replacedWidth = RenderBox::computeReplacedLogicalWidth(includeMaxWidth);
     Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
     if (!frame)
         return computeIntrinsicWidth(replacedWidth);

     // If our frame has an owner renderer, we're embedded through eg. object/embed.
     RenderPart* ownerRenderer = frame->ownerRenderer();
     if (!ownerRenderer)
         return computeIntrinsicWidth(replacedWidth);

     RenderStyle* ownerRendererStyle = ownerRenderer->style();
     ASSERT(ownerRendererStyle);
     ASSERT(frame->contentRenderer());

     Length ownerWidth = ownerRendererStyle->width();
     if (ownerWidth.isAuto())
         return computeIntrinsicWidth(replacedWidth);

     // Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#ViewportSpace
     // The SVG user agent negotiates with its parent user agent to determine the viewport into which the SVG user agent can render
     // the document. In some circumstances, SVG content will be embedded (by reference or inline) within a containing document.
     // This containing document might include attributes, properties and/or other parameters (explicit or implicit) which specify
     // or provide hints about the dimensions of the viewport for the SVG content. SVG content itself optionally can provide
     // information about the appropriate viewport region for the content via the ‘width’ and ‘height’ XML attributes on the
     // outermost svg element. The negotiation process uses any information provided by the containing document and the SVG
     // content itself to choose the viewport location and size.

     // The ‘width’ attribute on the outermost svg element establishes the viewport's width, unless the following conditions are met:
     // * the SVG content is a separately stored resource that is embedded by reference (such as the ‘object’ element in XHTML [XHTML]),
     //   or the SVG content is embedded inline within a containing document;
     // * and the referencing element or containing document is styled using CSS [CSS2] or XSL [XSL];
     // * and there are CSS-compatible positioning properties ([CSS2], section 9.3) specified on the referencing element
     //   (e.g., the ‘object’ element) or on the containing document's outermost svg element that are sufficient to establish
     //   the width of the viewport.
     //
     // Under these conditions, the positioning properties establish the viewport's width.
     int logicalWidth = ownerRenderer->computeReplacedLogicalWidthUsing(ownerWidth);
     int minLogicalWidth = ownerRenderer->computeReplacedLogicalWidthUsing(ownerRendererStyle->logicalMinWidth());
     int maxLogicalWidth = !includeMaxWidth || ownerRendererStyle->logicalMaxWidth().isUndefined() ? logicalWidth : ownerRenderer->computeReplacedLogicalWidthUsing(ownerRendererStyle->logicalMaxWidth());
     return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
 }

 int RenderSVGRoot::computeReplacedLogicalHeight() const
 {
     int replacedHeight = RenderBox::computeReplacedLogicalHeight();

     Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
     if (!frame)
         return computeIntrinsicHeight(replacedHeight);

     // If our frame has an owner renderer, we're embedded through eg. object/embed.
     RenderPart* ownerRenderer = frame->ownerRenderer();
     if (!ownerRenderer)
         return computeIntrinsicHeight(replacedHeight);

     RenderStyle* ownerRendererStyle = ownerRenderer->style();
     ASSERT(ownerRendererStyle);
     ASSERT(frame->contentRenderer());

     Length ownerHeight = ownerRendererStyle->height();
     if (ownerHeight.isAuto())
         return computeIntrinsicHeight(replacedHeight);

     // Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#ViewportSpace
     // See comment in RenderSVGRoot::computeReplacedLogicalWidth().
     // Similarly, if there are positioning properties specified on the referencing element or on the outermost svg element that
     // are sufficient to establish the height of the viewport, then these positioning properties establish the viewport's height;
     // otherwise, the ‘height’ attribute on the outermost svg element establishes the viewport's height.
     int logicalHeight = ownerRenderer->computeReplacedLogicalHeightUsing(ownerHeight);
     int minLogicalHeight = ownerRenderer->computeReplacedLogicalHeightUsing(ownerRendererStyle->logicalMinHeight());
     int maxLogicalHeight = ownerRendererStyle->logicalMaxHeight().isUndefined() ? logicalHeight : ownerRenderer->computeReplacedLogicalHeightUsing(ownerRendererStyle->logicalMaxHeight());
     return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
 }

 void RenderSVGRoot::layout()
 {
     ASSERT(needsLayout());

     // Arbitrary affine transforms are incompatible with LayoutState.
     LayoutStateDisabler layoutStateDisabler(view());

     bool needsLayout = selfNeedsLayout();
     LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);

     IntSize oldSize(width(), height());
     negotiateSizeWithHostDocumentIfNeeded();
     computeLogicalWidth();
     computeLogicalHeight();
     calcViewport();

     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
     m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();

     SVGRenderSupport::layoutChildren(this, needsLayout);
     m_isLayoutSizeChanged = false;

     // At this point LayoutRepainter already grabbed the old bounds,
     // recalculate them now so repaintAfterLayout() uses the new bounds.
     if (m_needsBoundariesOrTransformUpdate) {
         updateCachedBoundaries();
         m_needsBoundariesOrTransformUpdate = false;
     }

     repainter.repaintAfterLayout();

     setNeedsLayout(false);
 }

 bool RenderSVGRoot::selfWillPaint()
 {
 #if ENABLE(FILTERS)
     SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
     return resources && resources->filter();
 #else
     return false;
 #endif
 }

 void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)
 {
     if (paintInfo.context->paintingDisabled())
         return;

     bool isVisible = style()->visibility() == VISIBLE;
     IntPoint parentOriginInContainer(parentX, parentY);
     IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();

     if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)
         paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());

     if (paintInfo.phase == PaintPhaseBlockBackground)
         return;

     // An empty viewport disables rendering.  FIXME: Should we still render filters?
     if (m_viewportSize.isEmpty())
         return;

     // Don't paint if we don't have kids, except if we have filters we should paint those.
     if (!firstChild() && !selfWillPaint())
         return;

     // Make a copy of the PaintInfo because applyTransform will modify the damage rect.
     PaintInfo childPaintInfo(paintInfo);
     childPaintInfo.context->save();

     // Apply initial viewport clip - not affected by overflow handling
     childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));

     // Convert from container offsets (html renderers) to a relative transform (svg renderers).
     // Transform from our paint container's coordinate system to our local coords.
     childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));

     bool continueRendering = true;
     if (childPaintInfo.phase == PaintPhaseForeground)
         continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);

     if (continueRendering)
         RenderBox::paint(childPaintInfo, 0, 0);

     if (childPaintInfo.phase == PaintPhaseForeground)
         SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);

     childPaintInfo.context->restore();

     if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)
         paintOutline(paintInfo.context, IntRect(borderBoxOriginInContainer, size()));
 }

 void RenderSVGRoot::destroy()
 {
     SVGResourcesCache::clientDestroyed(this);
     RenderBox::destroy();
 }

 void RenderSVGRoot::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
 {
     if (diff == StyleDifferenceLayout)
         setNeedsBoundariesUpdate();
     RenderBox::styleWillChange(diff, newStyle);
 }

 void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderBox::styleDidChange(diff, oldStyle);
     SVGResourcesCache::clientStyleChanged(this, diff, style());
 }

 void RenderSVGRoot::updateFromElement()
 {
     RenderBox::updateFromElement();
     SVGResourcesCache::clientUpdatedFromElement(this, style());
 }

 void RenderSVGRoot::calcViewport()
 {
     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

     if (!svg->hasSetContainerSize()) {
         // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use
         // RenderBox::width()/height() (which pulls data from RenderStyle)
         m_viewportSize = FloatSize(width(), height());
         return;
     }

     // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use
     // the special relativeWidthValue accessors which respect the specified containerSize
     // FIXME: Check how SVGImage + zooming is supposed to be handled?
     SVGLength width = svg->width();
     SVGLength height = svg->height();
     m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),
                                height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));
 }

 // RenderBox methods will expect coordinates w/o any transforms in coordinates
 // relative to our borderBox origin.  This method gives us exactly that.
 AffineTransform RenderSVGRoot::localToBorderBoxTransform() const
 {
     IntSize borderAndPadding = borderOriginToContentBox();
     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
     float scale = svg->currentScale();
     FloatPoint translate = svg->currentTranslate();
     AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());
     return ctm * svg->viewBoxToViewTransform(width() / scale, height() / scale);
 }

 IntSize RenderSVGRoot::parentOriginToBorderBox() const
 {
     return IntSize(x(), y());
 }

 IntSize RenderSVGRoot::borderOriginToContentBox() const
 {
     return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());
 }

 AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const
 {
     return AffineTransform::translation(parentOriginInContainer.x(), parentOriginInContainer.y()) * localToParentTransform();
 }

 const AffineTransform& RenderSVGRoot::localToParentTransform() const
 {
     IntSize parentToBorderBoxOffset = parentOriginToBorderBox();

     m_localToParentTransform = AffineTransform::translation(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height()) * localToBorderBoxTransform();

     return m_localToParentTransform;
 }

 IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
 {
     return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);
 }

 void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)
 {
     // Apply our local transforms (except for x/y translation), then our shadow,
     // and then call RenderBox's method to handle all the normal CSS Box model bits
     repaintRect = localToBorderBoxTransform().mapRect(repaintRect);

     // Apply initial viewport clip - not affected by overflow settings
     repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));

     const SVGRenderStyle* svgStyle = style()->svgStyle();
     if (const ShadowData* shadow = svgStyle->shadow())
         shadow->adjustRectForShadow(repaintRect);

     RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
 }

 void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const
 {
     ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.
     ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.

     // Transform to our border box and let RenderBox transform the rest of the way.
     transformState.applyTransform(localToBorderBoxTransform());
     RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
 }

 void RenderSVGRoot::updateCachedBoundaries()
 {
     m_objectBoundingBox = FloatRect();
     m_strokeBoundingBox = FloatRect();
     m_repaintBoundingBox = FloatRect();

     SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_strokeBoundingBox, m_repaintBoundingBox);
     SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
     m_repaintBoundingBox.inflate(borderAndPaddingWidth());
 }

 bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const IntPoint& pointInContainer, int tx, int ty, HitTestAction hitTestAction)
 {
     IntSize containerToParentOffset(tx, ty);

     IntPoint pointInParent = pointInContainer - containerToParentOffset;
     IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();

     // Note: For now, we're ignoring hits to border and padding for <svg>
     IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();
     if (!contentBoxRect().contains(pointInContentBox))
         return false;

     IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);

     for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
         if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
             // FIXME: CSS/HTML assumes the local point is relative to the border box, right?
             updateHitTestResult(result, pointInBorderBox);
             // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
             result.addNodeToRectBasedTestResult(child->node(), pointInContainer);
             return true;
         }
     }

     // If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
     if (hitTestAction == HitTestBlockBackground && style()->pointerEvents() != PE_NONE) {
         // Only return true here, if the last hit testing phase 'BlockBackground' is executed. If we'd return true in the 'Foreground' phase,
         // hit testing would stop immediately. For SVG only trees this doesn't matter. Though when we have a <foreignObject> subtree we need
         // to be able to detect hits on the background of a <div> element. If we'd return true here in the 'Foreground' phase, we are not able
         // to detect these hits anymore.
         updateHitTestResult(result, roundedIntPoint(localPoint));
         return true;
     }

     return false;
 }

 }

 #endif // ENABLE(SVG)
	/*
	* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
	* Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
	* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
	* Copyright (C) 2009 Google, Inc.
	* Copyright (C) Research In Motion Limited 2011. All rights reserved.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include "config.h"

	#if ENABLE(SVG)
	#include "RenderSVGRoot.h"

	#include "Frame.h"
	#include "GraphicsContext.h"
	#include "HitTestResult.h"
	#include "RenderPart.h"
	#include "RenderSVGContainer.h"
	#include "RenderSVGResource.h"
	#include "RenderView.h"
	#include "SVGLength.h"
	#include "SVGRenderSupport.h"
	#include "SVGResources.h"
	#include "SVGSVGElement.h"
	#include "SVGStyledElement.h"
	#include "SVGViewSpec.h"
	#include "TransformState.h"

	#if ENABLE(FILTERS)
	#include "RenderSVGResourceFilter.h"
	#endif

	using namespace std;

	namespace WebCore {

	RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)
	: RenderBox(node)
	, m_isLayoutSizeChanged(false)
	, m_needsBoundariesOrTransformUpdate(true)
	, m_didNegotiateSize(false)
	{
	setReplaced(true);
	}

	RenderSVGRoot::~RenderSVGRoot()
	{
	}

	FloatSize RenderSVGRoot::computeIntrinsicRatio() const
	{
	// Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#IntrinsicSizing
	// The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including
	// SVG from an ‘object’ element in HTML styled with CSS. It is possible (indeed, common) for an SVG
	// graphic to have an intrinsic aspect ratio but not to have an intrinsic width or height.
	// The intrinsic aspect ratio must be calculated based upon the following rules:
	// The aspect ratio is calculated by dividing a width by a height.

	// If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers
	// (in, mm, cm, pt, pc, px, em, ex) or in user units, then the aspect ratio is calculated from the
	// ‘width’ and ‘height’ attributes after resolving both values to user units.
	if (style()->width().isFixed() && style()->height().isFixed())
	return FloatSize(width(), height());

	// If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted),
	// the aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG
	// document fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio
	// cannot be calculated and is considered unspecified.
	return static_cast<SVGSVGElement*>(node())->currentViewBoxRect().size();
	}

	void RenderSVGRoot::computePreferredLogicalWidths()
	{
	ASSERT(preferredLogicalWidthsDirty());

	int borderAndPadding = borderAndPaddingWidth();
	int width = computeReplacedLogicalWidth(false) + borderAndPadding;

	if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
	width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));

	if (style()->width().isPercent() \|\| (style()->width().isAuto() && style()->height().isPercent())) {
	m_minPreferredLogicalWidth = 0;
	m_maxPreferredLogicalWidth = width;
	} else
	m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = width;

	setPreferredLogicalWidthsDirty(false);
	}

	int RenderSVGRoot::computeIntrinsicWidth(int replacedWidth) const
	{
	if (!style()->width().isPercent())
	return replacedWidth;

	SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
	return static_cast<int>(ceilf(replacedWidth * svg->currentScale()));
	}

	int RenderSVGRoot::computeIntrinsicHeight(int replacedHeight) const
	{
	if (!style()->height().isPercent())
	return replacedHeight;

	const SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
	return static_cast<int>(ceilf(replacedHeight * svg->currentScale()));
	}

	void RenderSVGRoot::negotiateSizeWithHostDocumentIfNeeded()
	{
	if (m_didNegotiateSize)
	return;

	Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
	if (!frame)
	return;

	// If our frame has an owner renderer, we're embedded through eg. object/embed.
	// If we're embedded in a host document, we may be loaded after the host document
	// has finished layout. If the <object> doesn't specifiy width/height attributes
	// it has defaulted to 300x150 intrinsic size. If the SVG document has been loaded
	// we notify the RenderPart about the potential size changes, now it can properly
	// synchronize the intrinsic width/height/ratio, as defined in the SVG spec.
	if (RenderPart* ownerRenderer = frame->ownerRenderer()) {
	ownerRenderer->setNeedsLayoutAndPrefWidthsRecalc();
	m_didNegotiateSize = true;
	}
	}

	int RenderSVGRoot::computeReplacedLogicalWidth(bool includeMaxWidth) const
	{
	int replacedWidth = RenderBox::computeReplacedLogicalWidth(includeMaxWidth);
	Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
	if (!frame)
	return computeIntrinsicWidth(replacedWidth);

	// If our frame has an owner renderer, we're embedded through eg. object/embed.
	RenderPart* ownerRenderer = frame->ownerRenderer();
	if (!ownerRenderer)
	return computeIntrinsicWidth(replacedWidth);

	RenderStyle* ownerRendererStyle = ownerRenderer->style();
	ASSERT(ownerRendererStyle);
	ASSERT(frame->contentRenderer());

	Length ownerWidth = ownerRendererStyle->width();
	if (ownerWidth.isAuto())
	return computeIntrinsicWidth(replacedWidth);

	// Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#ViewportSpace
	// The SVG user agent negotiates with its parent user agent to determine the viewport into which the SVG user agent can render
	// the document. In some circumstances, SVG content will be embedded (by reference or inline) within a containing document.
	// This containing document might include attributes, properties and/or other parameters (explicit or implicit) which specify
	// or provide hints about the dimensions of the viewport for the SVG content. SVG content itself optionally can provide
	// information about the appropriate viewport region for the content via the ‘width’ and ‘height’ XML attributes on the
	// outermost svg element. The negotiation process uses any information provided by the containing document and the SVG
	// content itself to choose the viewport location and size.

	// The ‘width’ attribute on the outermost svg element establishes the viewport's width, unless the following conditions are met:
	// * the SVG content is a separately stored resource that is embedded by reference (such as the ‘object’ element in XHTML [XHTML]),
	// or the SVG content is embedded inline within a containing document;
	// * and the referencing element or containing document is styled using CSS [CSS2] or XSL [XSL];
	// * and there are CSS-compatible positioning properties ([CSS2], section 9.3) specified on the referencing element
	// (e.g., the ‘object’ element) or on the containing document's outermost svg element that are sufficient to establish
	// the width of the viewport.
	//
	// Under these conditions, the positioning properties establish the viewport's width.
	int logicalWidth = ownerRenderer->computeReplacedLogicalWidthUsing(ownerWidth);
	int minLogicalWidth = ownerRenderer->computeReplacedLogicalWidthUsing(ownerRendererStyle->logicalMinWidth());
	int maxLogicalWidth = !includeMaxWidth \|\| ownerRendererStyle->logicalMaxWidth().isUndefined() ? logicalWidth : ownerRenderer->computeReplacedLogicalWidthUsing(ownerRendererStyle->logicalMaxWidth());
	return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
	}

	int RenderSVGRoot::computeReplacedLogicalHeight() const
	{
	int replacedHeight = RenderBox::computeReplacedLogicalHeight();

	Frame* frame = node() && node()->document() ? node()->document()->frame() : 0;
	if (!frame)
	return computeIntrinsicHeight(replacedHeight);

	// If our frame has an owner renderer, we're embedded through eg. object/embed.
	RenderPart* ownerRenderer = frame->ownerRenderer();
	if (!ownerRenderer)
	return computeIntrinsicHeight(replacedHeight);

	RenderStyle* ownerRendererStyle = ownerRenderer->style();
	ASSERT(ownerRendererStyle);
	ASSERT(frame->contentRenderer());

	Length ownerHeight = ownerRendererStyle->height();
	if (ownerHeight.isAuto())
	return computeIntrinsicHeight(replacedHeight);

	// Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#ViewportSpace
	// See comment in RenderSVGRoot::computeReplacedLogicalWidth().
	// Similarly, if there are positioning properties specified on the referencing element or on the outermost svg element that
	// are sufficient to establish the height of the viewport, then these positioning properties establish the viewport's height;
	// otherwise, the ‘height’ attribute on the outermost svg element establishes the viewport's height.
	int logicalHeight = ownerRenderer->computeReplacedLogicalHeightUsing(ownerHeight);
	int minLogicalHeight = ownerRenderer->computeReplacedLogicalHeightUsing(ownerRendererStyle->logicalMinHeight());
	int maxLogicalHeight = ownerRendererStyle->logicalMaxHeight().isUndefined() ? logicalHeight : ownerRenderer->computeReplacedLogicalHeightUsing(ownerRendererStyle->logicalMaxHeight());
	return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
	}

	void RenderSVGRoot::layout()
	{
	ASSERT(needsLayout());

	// Arbitrary affine transforms are incompatible with LayoutState.
	LayoutStateDisabler layoutStateDisabler(view());

	bool needsLayout = selfNeedsLayout();
	LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);

	IntSize oldSize(width(), height());
	negotiateSizeWithHostDocumentIfNeeded();
	computeLogicalWidth();
	computeLogicalHeight();
	calcViewport();

	SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
	m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();

	SVGRenderSupport::layoutChildren(this, needsLayout);
	m_isLayoutSizeChanged = false;

	// At this point LayoutRepainter already grabbed the old bounds,
	// recalculate them now so repaintAfterLayout() uses the new bounds.
	if (m_needsBoundariesOrTransformUpdate) {
	updateCachedBoundaries();
	m_needsBoundariesOrTransformUpdate = false;
	}

	repainter.repaintAfterLayout();

	setNeedsLayout(false);
	}

	bool RenderSVGRoot::selfWillPaint()
	{
	#if ENABLE(FILTERS)
	SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
	return resources && resources->filter();
	#else
	return false;
	#endif
	}

	void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)
	{
	if (paintInfo.context->paintingDisabled())
	return;

	bool isVisible = style()->visibility() == VISIBLE;
	IntPoint parentOriginInContainer(parentX, parentY);
	IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();

	if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground \|\| paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)
	paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());

	if (paintInfo.phase == PaintPhaseBlockBackground)
	return;

	// An empty viewport disables rendering. FIXME: Should we still render filters?
	if (m_viewportSize.isEmpty())
	return;

	// Don't paint if we don't have kids, except if we have filters we should paint those.
	if (!firstChild() && !selfWillPaint())
	return;

	// Make a copy of the PaintInfo because applyTransform will modify the damage rect.
	PaintInfo childPaintInfo(paintInfo);
	childPaintInfo.context->save();

	// Apply initial viewport clip - not affected by overflow handling
	childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));

	// Convert from container offsets (html renderers) to a relative transform (svg renderers).
	// Transform from our paint container's coordinate system to our local coords.
	childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));

	bool continueRendering = true;
	if (childPaintInfo.phase == PaintPhaseForeground)
	continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);

	if (continueRendering)
	RenderBox::paint(childPaintInfo, 0, 0);

	if (childPaintInfo.phase == PaintPhaseForeground)
	SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);

	childPaintInfo.context->restore();

	if ((paintInfo.phase == PaintPhaseOutline \|\| paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)
	paintOutline(paintInfo.context, IntRect(borderBoxOriginInContainer, size()));
	}

	void RenderSVGRoot::destroy()
	{
	SVGResourcesCache::clientDestroyed(this);
	RenderBox::destroy();
	}

	void RenderSVGRoot::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
	{
	if (diff == StyleDifferenceLayout)
	setNeedsBoundariesUpdate();
	RenderBox::styleWillChange(diff, newStyle);
	}

	void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
	{
	RenderBox::styleDidChange(diff, oldStyle);
	SVGResourcesCache::clientStyleChanged(this, diff, style());
	}

	void RenderSVGRoot::updateFromElement()
	{
	RenderBox::updateFromElement();
	SVGResourcesCache::clientUpdatedFromElement(this, style());
	}

	void RenderSVGRoot::calcViewport()
	{
	SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

	if (!svg->hasSetContainerSize()) {
	// In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use
	// RenderBox::width()/height() (which pulls data from RenderStyle)
	m_viewportSize = FloatSize(width(), height());
	return;
	}

	// In the SVGImage case grab the SVGLength values off of SVGSVGElement and use
	// the special relativeWidthValue accessors which respect the specified containerSize
	// FIXME: Check how SVGImage + zooming is supposed to be handled?
	SVGLength width = svg->width();
	SVGLength height = svg->height();
	m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),
	height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));
	}

	// RenderBox methods will expect coordinates w/o any transforms in coordinates
	// relative to our borderBox origin. This method gives us exactly that.
	AffineTransform RenderSVGRoot::localToBorderBoxTransform() const
	{
	IntSize borderAndPadding = borderOriginToContentBox();
	SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
	float scale = svg->currentScale();
	FloatPoint translate = svg->currentTranslate();
	AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());
	return ctm * svg->viewBoxToViewTransform(width() / scale, height() / scale);
	}

	IntSize RenderSVGRoot::parentOriginToBorderBox() const
	{
	return IntSize(x(), y());
	}

	IntSize RenderSVGRoot::borderOriginToContentBox() const
	{
	return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());
	}

	AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const
	{
	return AffineTransform::translation(parentOriginInContainer.x(), parentOriginInContainer.y()) * localToParentTransform();
	}

	const AffineTransform& RenderSVGRoot::localToParentTransform() const
	{
	IntSize parentToBorderBoxOffset = parentOriginToBorderBox();

	m_localToParentTransform = AffineTransform::translation(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height()) * localToBorderBoxTransform();

	return m_localToParentTransform;
	}

	IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
	{
	return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);
	}

	void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)
	{
	// Apply our local transforms (except for x/y translation), then our shadow,
	// and then call RenderBox's method to handle all the normal CSS Box model bits
	repaintRect = localToBorderBoxTransform().mapRect(repaintRect);

	// Apply initial viewport clip - not affected by overflow settings
	repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));

	const SVGRenderStyle* svgStyle = style()->svgStyle();
	if (const ShadowData* shadow = svgStyle->shadow())
	shadow->adjustRectForShadow(repaintRect);

	RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
	}

	void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const
	{
	ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.
	ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.

	// Transform to our border box and let RenderBox transform the rest of the way.
	transformState.applyTransform(localToBorderBoxTransform());
	RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
	}

	void RenderSVGRoot::updateCachedBoundaries()
	{
	m_objectBoundingBox = FloatRect();
	m_strokeBoundingBox = FloatRect();
	m_repaintBoundingBox = FloatRect();

	SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_strokeBoundingBox, m_repaintBoundingBox);
	SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
	m_repaintBoundingBox.inflate(borderAndPaddingWidth());
	}

	bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const IntPoint& pointInContainer, int tx, int ty, HitTestAction hitTestAction)
	{
	IntSize containerToParentOffset(tx, ty);

	IntPoint pointInParent = pointInContainer - containerToParentOffset;
	IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();

	// Note: For now, we're ignoring hits to border and padding for <svg>
	IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();
	if (!contentBoxRect().contains(pointInContentBox))
	return false;

	IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);

	for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
	if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
	// FIXME: CSS/HTML assumes the local point is relative to the border box, right?
	updateHitTestResult(result, pointInBorderBox);
	// FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
	result.addNodeToRectBasedTestResult(child->node(), pointInContainer);
	return true;
	}
	}

	// If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
	if (hitTestAction == HitTestBlockBackground && style()->pointerEvents() != PE_NONE) {
	// Only return true here, if the last hit testing phase 'BlockBackground' is executed. If we'd return true in the 'Foreground' phase,
	// hit testing would stop immediately. For SVG only trees this doesn't matter. Though when we have a <foreignObject> subtree we need
	// to be able to detect hits on the background of a <div> element. If we'd return true here in the 'Foreground' phase, we are not able
	// to detect these hits anymore.
	updateHitTestResult(result, roundedIntPoint(localPoint));
	return true;
	}

	return false;
	}

	}

	#endif // ENABLE(SVG)