khtml/svg/SVGFitToViewBox.cpp

   1 /*
   2     Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3                   2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
   4
   5     This file is part of the KDE project
   6
   7     This library is free software; you can redistribute it and/or
   8     modify it under the terms of the GNU Library General Public
   9     License as published by the Free Software Foundation; either
  10     version 2 of the License, or (at your option) any later version.
  11
  12     This library is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15     Library General Public License for more details.
  16
  17     You should have received a copy of the GNU Library General Public License
  18     along with this library; see the file COPYING.LIB.  If not, write to
  19     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20     Boston, MA 02110-1301, USA.
  21 */
  22
  23 #include "config.h"
  24 #include "wtf/Platform.h"
  25
  26 #if ENABLE(SVG)
  27 #include "SVGFitToViewBox.h"
  28
  29 #include "AffineTransform.h"
  30 #include "FloatRect.h"
  31 #include "SVGDocumentExtensions.h"
  32 #include "SVGNames.h"
  33 #include "SVGParserUtilities.h"
  34 #include "SVGPreserveAspectRatio.h"
  35 //#include "StringImpl.h"
  36
  37 namespace WebCore {
  38
  39 SVGFitToViewBox::SVGFitToViewBox()
  40     : m_viewBox()
  41     , m_preserveAspectRatio(SVGPreserveAspectRatio::create())
  42 {
  43 }
  44
  45 SVGFitToViewBox::~SVGFitToViewBox()
  46 {
  47 }
  48
  49 ANIMATED_PROPERTY_DEFINITIONS_WITH_CONTEXT(SVGFitToViewBox, FloatRect, Rect, rect, ViewBox, viewBox, SVGNames::viewBoxAttr, m_viewBox)
  50 ANIMATED_PROPERTY_DEFINITIONS_WITH_CONTEXT(SVGFitToViewBox, SVGPreserveAspectRatio*, PreserveAspectRatio, preserveAspectRatio, PreserveAspectRatio, preserveAspectRatio, SVGNames::preserveAspectRatioAttr, m_preserveAspectRatio.get())
  51
  52 bool SVGFitToViewBox::parseViewBox(const UChar*& c, const UChar* end, float& x, float& y, float& w, float& h, bool validate)
  53 {
  54     Document* doc = contextElement()->document();
  55     String str(c, end - c);
  56
  57     skipOptionalSpaces(c, end);
  58
  59     bool valid = (parseNumber(c, end, x) && parseNumber(c, end, y) &&
  60           parseNumber(c, end, w) && parseNumber(c, end, h, false));
  61     if (!validate)
  62         return true;
  63     if (!valid) {
  64         //FIXME vtokarev doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
  65         return false;
  66     }
  67
  68     if (w < 0.0) { // check that width is positive
  69         doc->accessSVGExtensions()->reportError("A negative value for ViewBox width is not allowed");
  70         return false;
  71     } else if (h < 0.0) { // check that height is positive
  72         doc->accessSVGExtensions()->reportError("A negative value for ViewBox height is not allowed");
  73         return false;
  74     } else {
  75         skipOptionalSpaces(c, end);
  76         if (c < end) { // nothing should come after the last, fourth number
  77             //FIXME vtokarev doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
  78             return false;
  79         }
  80     }
  81
  82     return true;
  83 }
  84
  85 AffineTransform SVGFitToViewBox::viewBoxToViewTransform(float viewWidth, float viewHeight) const
  86 {
  87     FloatRect viewBoxRect = viewBox();
  88     if (!viewBoxRect.width() || !viewBoxRect.height())
  89         return AffineTransform();
  90
  91     return preserveAspectRatio()->getCTM(viewBoxRect.x(),
  92             viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(),
  93             0, 0, viewWidth, viewHeight);
  94 }
  95
  96 bool SVGFitToViewBox::parseMappedAttribute(MappedAttribute* attr)
  97 {
  98     if (attr->name() == SVGNames::viewBoxAttr) {
  99         float x = 0.0f, y = 0.0f, w = 0.0f, h = 0.0f;
 100         const UChar* c = attr->value().characters();
 101         const UChar* end = c + attr->value().length();
 102         if (parseViewBox(c, end, x, y, w, h))
 103             setViewBoxBaseValue(FloatRect(x, y, w, h));
 104         return true;
 105     } else if (attr->name() == SVGNames::preserveAspectRatioAttr) {
 106         const UChar* c = attr->value().characters();
 107         const UChar* end = c + attr->value().length();
 108         preserveAspectRatioBaseValue()->parsePreserveAspectRatio(c, end);
 109         return true;
 110     }
 111
 112     return false;
 113 }
 114
 115 bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName)
 116 {
 117     return (attrName == SVGNames::viewBoxAttr ||
 118             attrName == SVGNames::preserveAspectRatioAttr);
 119 }
 120
 121 }
 122
 123 #endif // ENABLE(SVG)