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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 #ifndef SVGFitToViewBox_h
     23 #define SVGFitToViewBox_h
     24 
     25 #include "core/SVGNames.h"
     26 #include "core/dom/Document.h"
     27 #include "core/dom/QualifiedName.h"
     28 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
     29 #include "core/svg/SVGAnimatedRect.h"
     30 #include "core/svg/SVGDocumentExtensions.h"
     31 #include "core/svg/SVGParsingError.h"
     32 #include "core/svg/SVGPreserveAspectRatio.h"
     33 #include "core/svg/SVGRect.h"
     34 #include "wtf/HashSet.h"
     35 
     36 namespace WebCore {
     37 
     38 class AffineTransform;
     39 class Document;
     40 
     41 class SVGFitToViewBox {
     42 public:
     43     enum PropertyMapPolicy {
     44         PropertyMapPolicyAdd,
     45         PropertyMapPolicySkip,
     46     };
     47 
     48     static AffineTransform viewBoxToViewTransform(const FloatRect& viewBoxRect, PassRefPtr<SVGPreserveAspectRatio>, float viewWidth, float viewHeight);
     49 
     50     static bool isKnownAttribute(const QualifiedName&);
     51     static void addSupportedAttributes(HashSet<QualifiedName>&);
     52 
     53     bool parseAttribute(const QualifiedName& name, const AtomicString& value, Document& document, SVGParsingError& parseError)
     54     {
     55         if (name == SVGNames::viewBoxAttr) {
     56             m_viewBox->setBaseValueAsString(value, parseError);
     57             if (m_viewBox->baseValue()->width() < 0.0f) {
     58                 document.accessSVGExtensions().reportError("A negative value for ViewBox width is not allowed");
     59                 m_viewBox->baseValue()->setInvalid();
     60             }
     61             if (m_viewBox->baseValue()->height() < 0.0f) {
     62                 document.accessSVGExtensions().reportError("A negative value for ViewBox height is not allowed");
     63                 m_viewBox->baseValue()->setInvalid();
     64             }
     65             return true;
     66         }
     67         if (name == SVGNames::preserveAspectRatioAttr) {
     68             m_preserveAspectRatio->setBaseValueAsString(value, parseError);
     69             return true;
     70         }
     71         return false;
     72     }
     73 
     74     bool hasEmptyViewBox() const { return m_viewBox->currentValue()->isValid() && m_viewBox->currentValue()->value().isEmpty(); }
     75 
     76     // JS API
     77     SVGAnimatedRect* viewBox() const { return m_viewBox.get(); }
     78     SVGAnimatedPreserveAspectRatio* preserveAspectRatio() const { return m_preserveAspectRatio.get(); }
     79 
     80 protected:
     81     explicit SVGFitToViewBox(SVGElement*, PropertyMapPolicy = PropertyMapPolicyAdd);
     82     void updateViewBox(const FloatRect&);
     83     void clearViewBox() { m_viewBox = nullptr; }
     84     void clearPreserveAspectRatio() { m_preserveAspectRatio = nullptr; }
     85 
     86 private:
     87     RefPtr<SVGAnimatedRect> m_viewBox;
     88     RefPtr<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
     89 };
     90 
     91 } // namespace WebCore
     92 
     93 #endif // SVGFitToViewBox_h
     94