116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/*
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* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
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* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
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* Copyright (C) 2009 Google, Inc. All rights reserved.
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* Copyright (C) Research In Motion Limited 2010. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "SVGLocatable.h"
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#include "RenderElement.h"
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#include "SVGGraphicsElement.h"
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#include "SVGImageElement.h"
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#include "SVGMatrix.h"
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#include "SVGNames.h"
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namespace WebCore {
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static bool isViewportElement(Node* node)
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{
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return (node->hasTagName(SVGNames::svgTag)
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|| node->hasTagName(SVGNames::symbolTag)
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|| node->hasTagName(SVGNames::foreignObjectTag)
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|| is<SVGImageElement>(*node));
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}
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SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
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{
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ASSERT(element);
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for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
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if (isViewportElement(current))
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return downcast<SVGElement>(current);
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}
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return nullptr;
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}
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SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
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{
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ASSERT(element);
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SVGElement* farthest = nullptr;
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for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
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if (isViewportElement(current))
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farthest = downcast<SVGElement>(current);
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}
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return farthest;
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}
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FloatRect SVGLocatable::getBBox(SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
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{
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ASSERT(element);
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if (styleUpdateStrategy == AllowStyleUpdate)
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element->document().updateLayoutIgnorePendingStylesheets();
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// FIXME: Eventually we should support getBBox for detached elements.
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if (!element->renderer())
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return FloatRect();
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return element->renderer()->objectBoundingBox();
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}
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AffineTransform SVGLocatable::computeCTM(SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
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{
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ASSERT(element);
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if (styleUpdateStrategy == AllowStyleUpdate)
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element->document().updateLayoutIgnorePendingStylesheets();
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AffineTransform ctm;
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SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : nullptr;
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for (Element* currentElement = element; currentElement; currentElement = currentElement->parentOrShadowHostElement()) {
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if (!currentElement->isSVGElement())
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break;
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ctm = downcast<SVGElement>(*currentElement).localCoordinateSpaceTransform(mode).multiply(ctm);
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// For getCTM() computation, stop at the nearest viewport element
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if (currentElement == stopAtElement)
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break;
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}
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return ctm;
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}
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ExceptionOr<Ref<SVGMatrix>> SVGLocatable::getTransformToElement(SVGElement* target, StyleUpdateStrategy styleUpdateStrategy)
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{
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AffineTransform ctm = getCTM(styleUpdateStrategy);
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if (is<SVGGraphicsElement>(target)) {
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AffineTransform targetCTM = downcast<SVGGraphicsElement>(*target).getCTM(styleUpdateStrategy);
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if (auto inverse = targetCTM.inverse())
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ctm = inverse.value() * ctm;
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else
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return Exception { InvalidStateError, "Matrix is not invertible"_s };
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}
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return SVGMatrix::create(ctm);
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}
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}
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