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      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 
     22 #include "core/rendering/svg/RenderSVGGradientStop.h"
     23 
     24 #include "SVGNames.h"
     25 #include "core/rendering/svg/RenderSVGResourceContainer.h"
     26 #include "core/svg/SVGGradientElement.h"
     27 #include "core/svg/SVGStopElement.h"
     28 
     29 namespace WebCore {
     30 
     31 using namespace SVGNames;
     32 
     33 RenderSVGGradientStop::RenderSVGGradientStop(SVGStopElement* element)
     34     : RenderObject(element)
     35 {
     36 }
     37 
     38 RenderSVGGradientStop::~RenderSVGGradientStop()
     39 {
     40 }
     41 
     42 void RenderSVGGradientStop::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     43 {
     44     RenderObject::styleDidChange(diff, oldStyle);
     45     if (diff == StyleDifferenceEqual)
     46         return;
     47 
     48     // <stop> elements should only be allowed to make renderers under gradient elements
     49     // but I can imagine a few cases we might not be catching, so let's not crash if our parent isn't a gradient.
     50     SVGGradientElement* gradient = gradientElement();
     51     if (!gradient)
     52         return;
     53 
     54     RenderObject* renderer = gradient->renderer();
     55     if (!renderer)
     56         return;
     57 
     58     ASSERT(renderer->isSVGResourceContainer());
     59     RenderSVGResourceContainer* container = renderer->toRenderSVGResourceContainer();
     60     container->removeAllClientsFromCache();
     61 }
     62 
     63 void RenderSVGGradientStop::layout()
     64 {
     65     StackStats::LayoutCheckPoint layoutCheckPoint;
     66     clearNeedsLayout();
     67 }
     68 
     69 SVGGradientElement* RenderSVGGradientStop::gradientElement() const
     70 {
     71     ContainerNode* parentNode = node()->parentNode();
     72     if (parentNode->hasTagName(linearGradientTag) || parentNode->hasTagName(radialGradientTag))
     73         return toSVGGradientElement(parentNode);
     74     return 0;
     75 }
     76 
     77 }
     78