khtml/svg/SVGPreserveAspectRatio.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 "SVGPreserveAspectRatio.h"
  28
  29 #include "SVGParserUtilities.h"
  30 #include "SVGSVGElement.h"
  31
  32 namespace WebCore {
  33
  34 SVGPreserveAspectRatio::SVGPreserveAspectRatio()
  35     : m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID)
  36     , m_meetOrSlice(SVG_MEETORSLICE_MEET)
  37 {
  38     // FIXME: Should the two values default to UNKNOWN instead?
  39 }
  40
  41 SVGPreserveAspectRatio::~SVGPreserveAspectRatio()
  42 {
  43 }
  44
  45 void SVGPreserveAspectRatio::setAlign(unsigned short align)
  46 {
  47     m_align = align;
  48 }
  49
  50 unsigned short SVGPreserveAspectRatio::align() const
  51 {
  52     return m_align;
  53 }
  54
  55 void SVGPreserveAspectRatio::setMeetOrSlice(unsigned short meetOrSlice)
  56 {
  57     m_meetOrSlice = meetOrSlice;
  58 }
  59
  60 unsigned short SVGPreserveAspectRatio::meetOrSlice() const
  61 {
  62     return m_meetOrSlice;
  63 }
  64
  65 bool SVGPreserveAspectRatio::parsePreserveAspectRatio(const UChar*& currParam, const UChar* end, bool validate)
  66 {
  67     SVGPreserveAspectRatioType align = SVG_PRESERVEASPECTRATIO_NONE;
  68     SVGMeetOrSliceType meetOrSlice = SVG_MEETORSLICE_MEET;
  69     bool ret = false;
  70
  71     if (!skipOptionalSpaces(currParam, end))
  72         goto bail_out;
  73
  74     if (*currParam == 'd') {
  75         /*if (!skipString(currParam, end, "defer"))
  76             goto bail_out;
  77         // FIXME: We just ignore the "defer" here.
  78         if (!skipOptionalSpaces(currParam, end))
  79             goto bail_out;*/
  80     }
  81
  82     if (*currParam == 'n') {
  83         /*if (!skipString(currParam, end, "none"))
  84             goto bail_out;*/
  85         skipOptionalSpaces(currParam, end);
  86     } else if (*currParam == 'x') {
  87         if ((end - currParam) < 8)
  88             goto bail_out;
  89         if (currParam[1] != 'M' || currParam[4] != 'Y' || currParam[5] != 'M')
  90             goto bail_out;
  91         if (currParam[2] == 'i') {
  92             if (currParam[3] == 'n') {
  93                 if (currParam[6] == 'i') {
  94                     if (currParam[7] == 'n')
  95                         align = SVG_PRESERVEASPECTRATIO_XMINYMIN;
  96                     else if (currParam[7] == 'd')
  97                         align = SVG_PRESERVEASPECTRATIO_XMINYMID;
  98                     else
  99                         goto bail_out;
 100                 } else if (currParam[6] == 'a' && currParam[7] == 'x')
 101                      align = SVG_PRESERVEASPECTRATIO_XMINYMAX;
 102                 else
 103                      goto bail_out;
 104              } else if (currParam[3] == 'd') {
 105                 if (currParam[6] == 'i') {
 106                     if (currParam[7] == 'n')
 107                         align = SVG_PRESERVEASPECTRATIO_XMIDYMIN;
 108                     else if (currParam[7] == 'd')
 109                         align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
 110                     else
 111                         goto bail_out;
 112                 } else if (currParam[6] == 'a' && currParam[7] == 'x')
 113                     align = SVG_PRESERVEASPECTRATIO_XMIDYMAX;
 114                 else
 115                     goto bail_out;
 116             } else
 117                 goto bail_out;
 118         } else if (currParam[2] == 'a' && currParam[3] == 'x') {
 119             if (currParam[6] == 'i') {
 120                 if (currParam[7] == 'n')
 121                     align = SVG_PRESERVEASPECTRATIO_XMAXYMIN;
 122                 else if (currParam[7] == 'd')
 123                     align = SVG_PRESERVEASPECTRATIO_XMAXYMID;
 124                 else
 125                     goto bail_out;
 126             } else if (currParam[6] == 'a' && currParam[7] == 'x')
 127                 align = SVG_PRESERVEASPECTRATIO_XMAXYMAX;
 128             else
 129                 goto bail_out;
 130         } else
 131             goto bail_out;
 132         currParam += 8;
 133         skipOptionalSpaces(currParam, end);
 134     } else
 135         goto bail_out;
 136
 137     if (currParam < end) {
 138         if (*currParam == 'm') {
 139             /*if (!skipString(currParam, end, "meet"))
 140                 goto bail_out;
 141             skipOptionalSpaces(currParam, end);*/
 142         } else if (*currParam == 's') {
 143             /*if (!skipString(currParam, end, "slice"))
 144                 goto bail_out;
 145             skipOptionalSpaces(currParam, end);
 146             if (align != SVG_PRESERVEASPECTRATIO_NONE)
 147                 meetOrSlice = SVG_MEETORSLICE_SLICE;*/
 148         }
 149     }
 150
 151     if (end != currParam && validate) {
 152 bail_out:
 153         // FIXME: Should the two values be set to UNKNOWN instead?
 154         align = SVG_PRESERVEASPECTRATIO_NONE;
 155         meetOrSlice = SVG_MEETORSLICE_MEET;
 156     } else
 157         ret = true;
 158
 159     if (m_align == align && m_meetOrSlice == meetOrSlice)
 160         return ret;
 161
 162     m_align = align;
 163     m_meetOrSlice = meetOrSlice;
 164     return ret;
 165 }
 166
 167 AffineTransform SVGPreserveAspectRatio::getCTM(double logicX, double logicY,
 168                                                double logicWidth, double logicHeight,
 169                                                double /*physX*/, double /*physY*/,
 170                                                double physWidth, double physHeight)
 171 {
 172     AffineTransform temp;
 173
 174     if (align() == SVG_PRESERVEASPECTRATIO_UNKNOWN)
 175         return temp;
 176
 177     double vpar = logicWidth / logicHeight;
 178     double svgar = physWidth / physHeight;
 179
 180     if (align() == SVG_PRESERVEASPECTRATIO_NONE) {
 181         temp.scale(physWidth / logicWidth, physHeight / logicHeight);
 182         temp.translate(-logicX, -logicY);
 183     } else if (vpar < svgar && (meetOrSlice() == SVG_MEETORSLICE_MEET) || vpar >= svgar && (meetOrSlice() == SVG_MEETORSLICE_SLICE)) {
 184         temp.scale(physHeight / logicHeight, physHeight / logicHeight);
 185
 186         if (align() == SVG_PRESERVEASPECTRATIO_XMINYMIN || align() == SVG_PRESERVEASPECTRATIO_XMINYMID || align() == SVG_PRESERVEASPECTRATIO_XMINYMAX)
 187             temp.translate(-logicX, -logicY);
 188         else if (align() == SVG_PRESERVEASPECTRATIO_XMIDYMIN || align() == SVG_PRESERVEASPECTRATIO_XMIDYMID || align() == SVG_PRESERVEASPECTRATIO_XMIDYMAX)
 189             temp.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight) / 2, -logicY);
 190         else
 191             temp.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight), -logicY);
 192     } else {
 193         temp.scale(physWidth / logicWidth, physWidth / logicWidth);
 194
 195         if (align() == SVG_PRESERVEASPECTRATIO_XMINYMIN || align() == SVG_PRESERVEASPECTRATIO_XMIDYMIN || align() == SVG_PRESERVEASPECTRATIO_XMAXYMIN)
 196             temp.translate(-logicX, -logicY);
 197         else if (align() == SVG_PRESERVEASPECTRATIO_XMINYMID || align() == SVG_PRESERVEASPECTRATIO_XMIDYMID || align() == SVG_PRESERVEASPECTRATIO_XMAXYMID)
 198             temp.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth) / 2);
 199         else
 200             temp.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth));
 201     }
 202
 203     return temp;
 204 }
 205
 206 }
 207
 208 #endif // ENABLE(SVG)