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      1 /*
      2  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2009 Google, Inc.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #include "core/rendering/svg/RenderSVGTransformableContainer.h"
     25 
     26 #include "SVGNames.h"
     27 #include "core/rendering/svg/SVGRenderSupport.h"
     28 #include "core/svg/SVGGraphicsElement.h"
     29 #include "core/svg/SVGUseElement.h"
     30 
     31 namespace WebCore {
     32 
     33 RenderSVGTransformableContainer::RenderSVGTransformableContainer(SVGGraphicsElement* node)
     34     : RenderSVGContainer(node)
     35     , m_needsTransformUpdate(true)
     36     , m_didTransformToRootUpdate(false)
     37 {
     38 }
     39 
     40 bool RenderSVGTransformableContainer::calculateLocalTransform()
     41 {
     42     SVGGraphicsElement* element = toSVGGraphicsElement(node());
     43 
     44     // If we're either the renderer for a <use> element, or for any <g> element inside the shadow
     45     // tree, that was created during the use/symbol/svg expansion in SVGUseElement. These containers
     46     // need to respect the translations induced by their corresponding use elements x/y attributes.
     47     SVGUseElement* useElement = 0;
     48     if (element->hasTagName(SVGNames::useTag))
     49         useElement = toSVGUseElement(element);
     50     else if (element->isInShadowTree() && element->hasTagName(SVGNames::gTag)) {
     51         SVGElement* correspondingElement = element->correspondingElement();
     52         if (correspondingElement && correspondingElement->hasTagName(SVGNames::useTag))
     53             useElement = toSVGUseElement(correspondingElement);
     54     }
     55 
     56     if (useElement) {
     57         SVGLengthContext lengthContext(useElement);
     58         FloatSize translation(useElement->xCurrentValue().value(lengthContext), useElement->yCurrentValue().value(lengthContext));
     59         if (translation != m_lastTranslation)
     60             m_needsTransformUpdate = true;
     61         m_lastTranslation = translation;
     62     }
     63 
     64     m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
     65     if (!m_needsTransformUpdate)
     66         return false;
     67 
     68     m_localTransform = element->animatedLocalTransform();
     69     m_localTransform.translate(m_lastTranslation.width(), m_lastTranslation.height());
     70     m_needsTransformUpdate = false;
     71     return true;
     72 }
     73 
     74 }
     75