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/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. 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"
#include "SVGLocatable.h"
#include "RenderElement.h"
#include "SVGException.h"
#include "SVGGraphicsElement.h"
#include "SVGImageElement.h"
#include "SVGNames.h"
namespace WebCore {
static bool isViewportElement(Node* node)
{
return (node->hasTagName(SVGNames::svgTag)
|| node->hasTagName(SVGNames::symbolTag)
|| node->hasTagName(SVGNames::foreignObjectTag)
|| is<SVGImageElement>(*node));
}
SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
{
ASSERT(element);
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
if (isViewportElement(current))
return downcast<SVGElement>(current);
}
return nullptr;
}
SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
{
ASSERT(element);
SVGElement* farthest = nullptr;
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
if (isViewportElement(current))
farthest = downcast<SVGElement>(current);
}
return farthest;
}
FloatRect SVGLocatable::getBBox(SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets();
// FIXME: Eventually we should support getBBox for detached elements.
if (!element->renderer())
return FloatRect();
return element->renderer()->objectBoundingBox();
}
AffineTransform SVGLocatable::computeCTM(SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets();
AffineTransform ctm;
SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : nullptr;
for (Element* currentElement = element; currentElement; currentElement = currentElement->parentOrShadowHostElement()) {
if (!currentElement->isSVGElement())
break;
ctm = downcast<SVGElement>(*currentElement).localCoordinateSpaceTransform(mode).multiply(ctm);
// For getCTM() computation, stop at the nearest viewport element
if (currentElement == stopAtElement)
break;
}
return ctm;
}
AffineTransform SVGLocatable::getTransformToElement(SVGElement* target, ExceptionCode& ec, StyleUpdateStrategy styleUpdateStrategy)
{
AffineTransform ctm = getCTM(styleUpdateStrategy);
if (is<SVGGraphicsElement>(target)) {
AffineTransform targetCTM = downcast<SVGGraphicsElement>(*target).getCTM(styleUpdateStrategy);
if (auto inverse = targetCTM.inverse())
ctm = inverse.value() * ctm;
else {
ec = SVGException::SVG_MATRIX_NOT_INVERTABLE;
return ctm;
}
}
return ctm;
}
}
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