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SVGFitToViewBox.cpp

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00001 /*
00002     Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
00003                   2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
00004 
00005     This file is part of the KDE project
00006 
00007     This library is free software; you can redistribute it and/or
00008     modify it under the terms of the GNU Library General Public
00009     License as published by the Free Software Foundation; either
00010     version 2 of the License, or (at your option) any later version.
00011 
00012     This library is distributed in the hope that it will be useful,
00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015     Library General Public License for more details.
00016 
00017     You should have received a copy of the GNU Library General Public License
00018     along with this library; see the file COPYING.LIB.  If not, write to
00019     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00020     Boston, MA 02110-1301, USA.
00021 */
00022 
00023 #include "config.h"
00024 #include "wtf/Platform.h"
00025 
00026 #if ENABLE(SVG)
00027 #include "SVGFitToViewBox.h"
00028 
00029 #include "AffineTransform.h"
00030 #include "FloatRect.h"
00031 #include "SVGDocumentExtensions.h"
00032 #include "SVGNames.h"
00033 #include "SVGParserUtilities.h"
00034 #include "SVGPreserveAspectRatio.h"
00035 //#include "StringImpl.h"
00036 
00037 namespace WebCore {
00038 
00039 SVGFitToViewBox::SVGFitToViewBox()
00040     : m_viewBox()
00041     , m_preserveAspectRatio(SVGPreserveAspectRatio::create())
00042 {
00043 }
00044 
00045 SVGFitToViewBox::~SVGFitToViewBox()
00046 {
00047 }
00048 
00049 ANIMATED_PROPERTY_DEFINITIONS_WITH_CONTEXT(SVGFitToViewBox, FloatRect, Rect, rect, ViewBox, viewBox, SVGNames::viewBoxAttr, m_viewBox)
00050 ANIMATED_PROPERTY_DEFINITIONS_WITH_CONTEXT(SVGFitToViewBox, SVGPreserveAspectRatio*, PreserveAspectRatio, preserveAspectRatio, PreserveAspectRatio, preserveAspectRatio, SVGNames::preserveAspectRatioAttr, m_preserveAspectRatio.get())
00051 
00052 bool SVGFitToViewBox::parseViewBox(const UChar*& c, const UChar* end, float& x, float& y, float& w, float& h, bool validate)
00053 {
00054     Document* doc = contextElement()->document();
00055     String str(c, end - c);
00056 
00057     skipOptionalSpaces(c, end);
00058 
00059     bool valid = (parseNumber(c, end, x) && parseNumber(c, end, y) &&
00060           parseNumber(c, end, w) && parseNumber(c, end, h, false));
00061     if (!validate)
00062         return true;
00063     if (!valid) {
00064         //FIXME vtokarev doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
00065         return false;
00066     }
00067 
00068     if (w < 0.0) { // check that width is positive
00069         doc->accessSVGExtensions()->reportError("A negative value for ViewBox width is not allowed");
00070         return false;
00071     } else if (h < 0.0) { // check that height is positive
00072         doc->accessSVGExtensions()->reportError("A negative value for ViewBox height is not allowed");
00073         return false;
00074     } else {
00075         skipOptionalSpaces(c, end);
00076         if (c < end) { // nothing should come after the last, fourth number
00077             //FIXME vtokarev doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
00078             return false;
00079         }
00080     }
00081 
00082     return true;
00083 }
00084 
00085 AffineTransform SVGFitToViewBox::viewBoxToViewTransform(float viewWidth, float viewHeight) const
00086 {
00087     FloatRect viewBoxRect = viewBox();
00088     if (!viewBoxRect.width() || !viewBoxRect.height())
00089         return AffineTransform();
00090 
00091     return preserveAspectRatio()->getCTM(viewBoxRect.x(),
00092             viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(),
00093             0, 0, viewWidth, viewHeight);
00094 }
00095 
00096 bool SVGFitToViewBox::parseMappedAttribute(MappedAttribute* attr)
00097 {
00098     if (attr->name() == SVGNames::viewBoxAttr) {
00099         float x = 0.0f, y = 0.0f, w = 0.0f, h = 0.0f;
00100         const UChar* c = attr->value().characters();
00101         const UChar* end = c + attr->value().length();
00102         if (parseViewBox(c, end, x, y, w, h))
00103             setViewBoxBaseValue(FloatRect(x, y, w, h));
00104         return true;
00105     } else if (attr->name() == SVGNames::preserveAspectRatioAttr) {
00106         const UChar* c = attr->value().characters();
00107         const UChar* end = c + attr->value().length();
00108         preserveAspectRatioBaseValue()->parsePreserveAspectRatio(c, end);
00109         return true;
00110     }
00111 
00112     return false;
00113 }
00114 
00115 bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName)
00116 {
00117     return (attrName == SVGNames::viewBoxAttr ||
00118             attrName == SVGNames::preserveAspectRatioAttr);
00119 }
00120 
00121 }
00122 
00123 #endif // ENABLE(SVG)

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