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      1 /*
      2  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
      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/svg/SVGFitToViewBox.h"
     25 
     26 #include "core/dom/Attribute.h"
     27 #include "core/dom/Document.h"
     28 #include "core/svg/SVGDocumentExtensions.h"
     29 #include "core/svg/SVGElement.h"
     30 #include "core/svg/SVGParserUtilities.h"
     31 #include "platform/geometry/FloatRect.h"
     32 #include "platform/transforms/AffineTransform.h"
     33 #include "wtf/text/StringImpl.h"
     34 
     35 namespace WebCore {
     36 
     37 SVGFitToViewBox::SVGFitToViewBox(SVGElement* element, PropertyMapPolicy propertyMapPolicy)
     38     : m_viewBox(SVGAnimatedRect::create(element, SVGNames::viewBoxAttr))
     39     , m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(element, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create()))
     40 {
     41     ASSERT(element);
     42     if (propertyMapPolicy == PropertyMapPolicyAdd) {
     43         element->addToPropertyMap(m_viewBox);
     44         element->addToPropertyMap(m_preserveAspectRatio);
     45     }
     46 }
     47 
     48 AffineTransform SVGFitToViewBox::viewBoxToViewTransform(const FloatRect& viewBoxRect, PassRefPtr<SVGPreserveAspectRatio> preserveAspectRatio, float viewWidth, float viewHeight)
     49 {
     50     if (!viewBoxRect.width() || !viewBoxRect.height())
     51         return AffineTransform();
     52 
     53     return preserveAspectRatio->getCTM(viewBoxRect.x(), viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(), viewWidth, viewHeight);
     54 }
     55 
     56 bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName)
     57 {
     58     return attrName == SVGNames::viewBoxAttr || attrName == SVGNames::preserveAspectRatioAttr;
     59 }
     60 
     61 void SVGFitToViewBox::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
     62 {
     63     supportedAttributes.add(SVGNames::viewBoxAttr);
     64     supportedAttributes.add(SVGNames::preserveAspectRatioAttr);
     65 }
     66 
     67 void SVGFitToViewBox::updateViewBox(const FloatRect& rect)
     68 {
     69     ASSERT(m_viewBox);
     70     m_viewBox->baseValue()->setValue(rect);
     71 }
     72 
     73 }
     74