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