WebCore/svg/SVGPreserveAspectRatio.cpp

   1 /*
   2     Copyright (C) 2004, 2005 Nikolas Zimmermann <wildfox@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 #if ENABLE(SVG)
  25 #include "SVGPreserveAspectRatio.h"
  26
  27 #include "SVGParserUtilities.h"
  28 #include "SVGSVGElement.h"
  29
  30 namespace WebCore {
  31
  32 SVGPreserveAspectRatio::SVGPreserveAspectRatio()
  33     : RefCounted<SVGPreserveAspectRatio>()
  34     , m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID)
  35     , m_meetOrSlice(SVG_MEETORSLICE_MEET)
  36 {
  37     // FIXME: Should the two values default to UNKNOWN instead?
  38 }
  39
  40 SVGPreserveAspectRatio::~SVGPreserveAspectRatio()
  41 {
  42 }
  43
  44 void SVGPreserveAspectRatio::setAlign(unsigned short align)
  45 {
  46     m_align = align;
  47 }
  48
  49 unsigned short SVGPreserveAspectRatio::align() const
  50 {
  51     return m_align;
  52 }
  53
  54 void SVGPreserveAspectRatio::setMeetOrSlice(unsigned short meetOrSlice)
  55 {
  56     m_meetOrSlice = meetOrSlice;
  57 }
  58
  59 unsigned short SVGPreserveAspectRatio::meetOrSlice() const
  60 {
  61     return m_meetOrSlice;
  62 }
  63
  64 bool SVGPreserveAspectRatio::parsePreserveAspectRatio(const UChar*& currParam, const UChar* end, bool validate)
  65 {
  66     SVGPreserveAspectRatioType align = SVG_PRESERVEASPECTRATIO_NONE;
  67     SVGMeetOrSliceType meetOrSlice = SVG_MEETORSLICE_MEET;
  68     bool ret = false;
  69
  70     if (!skipOptionalSpaces(currParam, end))
  71         goto bail_out;
  72
  73     if (*currParam == 'd') {
  74         if (!skipString(currParam, end, "defer"))
  75             goto bail_out;
  76         // FIXME: We just ignore the "defer" here.
  77         if (!skipOptionalSpaces(currParam, end))
  78             goto bail_out;
  79     }
  80
  81     if (*currParam == 'n') {
  82         if (!skipString(currParam, end, "none"))
  83             goto bail_out;
  84         skipOptionalSpaces(currParam, end);
  85     } else if (*currParam == 'x') {
  86         if ((end - currParam) < 8)
  87             goto bail_out;
  88         if (currParam[1] != 'M' || currParam[4] != 'Y' || currParam[5] != 'M')
  89             goto bail_out;
  90         if (currParam[2] == 'i') {
  91             if (currParam[3] == 'n') {
  92                 if (currParam[6] == 'i') {
  93                     if (currParam[7] == 'n')
  94                         align = SVG_PRESERVEASPECTRATIO_XMINYMIN;
  95                     else if (currParam[7] == 'd')
  96                         align = SVG_PRESERVEASPECTRATIO_XMINYMID;
  97                     else
  98                         goto bail_out;
  99                 } else if (currParam[6] == 'a' && currParam[7] == 'x')
 100                      align = SVG_PRESERVEASPECTRATIO_XMINYMAX;
 101                 else
 102                      goto bail_out;
 103              } else if (currParam[3] == 'd') {
 104                 if (currParam[6] == 'i') {
 105                     if (currParam[7] == 'n')
 106                         align = SVG_PRESERVEASPECTRATIO_XMIDYMIN;
 107                     else if (currParam[7] == 'd')
 108                         align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
 109                     else
 110                         goto bail_out;
 111                 } else if (currParam[6] == 'a' && currParam[7] == 'x')
 112                     align = SVG_PRESERVEASPECTRATIO_XMIDYMAX;
 113                 else
 114                     goto bail_out;
 115             } else
 116                 goto bail_out;
 117         } else if (currParam[2] == 'a' && currParam[3] == 'x') {
 118             if (currParam[6] == 'i') {
 119                 if (currParam[7] == 'n')
 120                     align = SVG_PRESERVEASPECTRATIO_XMAXYMIN;
 121                 else if (currParam[7] == 'd')
 122                     align = SVG_PRESERVEASPECTRATIO_XMAXYMID;
 123                 else
 124                     goto bail_out;
 125             } else if (currParam[6] == 'a' && currParam[7] == 'x')
 126                 align = SVG_PRESERVEASPECTRATIO_XMAXYMAX;
 127             else
 128                 goto bail_out;
 129         } else
 130             goto bail_out;
 131         currParam += 8;
 132         skipOptionalSpaces(currParam, end);
 133     } else
 134         goto bail_out;
 135
 136     if (currParam < end) {
 137         if (*currParam == 'm') {
 138             if (!skipString(currParam, end, "meet"))
 139                 goto bail_out;
 140             skipOptionalSpaces(currParam, end);
 141         } else if (*currParam == 's') {
 142             if (!skipString(currParam, end, "slice"))
 143                 goto bail_out;
 144             skipOptionalSpaces(currParam, end);
 145             if (align != SVG_PRESERVEASPECTRATIO_NONE)
 146                 meetOrSlice = SVG_MEETORSLICE_SLICE;
 147         }
 148     }
 149
 150     if (end != currParam && validate) {
 151 bail_out:
 152         // FIXME: Should the two values be set to UNKNOWN instead?
 153         align = SVG_PRESERVEASPECTRATIO_NONE;
 154         meetOrSlice = SVG_MEETORSLICE_MEET;
 155     } else
 156         ret = true;
 157
 158     if (m_align == align && m_meetOrSlice == meetOrSlice)
 159         return ret;
 160
 161     m_align = align;
 162     m_meetOrSlice = meetOrSlice;
 163     return ret;
 164 }
 165
 166 AffineTransform SVGPreserveAspectRatio::getCTM(double logicX, double logicY,
 167                                                double logicWidth, double logicHeight,
 168                                                double /*physX*/, double /*physY*/,
 169                                                double physWidth, double physHeight)
 170 {
 171     AffineTransform temp;
 172
 173     if (align() == SVG_PRESERVEASPECTRATIO_UNKNOWN)
 174         return temp;
 175
 176     double vpar = logicWidth / logicHeight;
 177     double svgar = physWidth / physHeight;
 178
 179     if (align() == SVG_PRESERVEASPECTRATIO_NONE) {
 180         temp.scale(physWidth / logicWidth, physHeight / logicHeight);
 181         temp.translate(-logicX, -logicY);
 182     } else if (vpar < svgar && (meetOrSlice() == SVG_MEETORSLICE_MEET) || vpar >= svgar && (meetOrSlice() == SVG_MEETORSLICE_SLICE)) {
 183         temp.scale(physHeight / logicHeight, physHeight / logicHeight);
 184
 185         if (align() == SVG_PRESERVEASPECTRATIO_XMINYMIN || align() == SVG_PRESERVEASPECTRATIO_XMINYMID || align() == SVG_PRESERVEASPECTRATIO_XMINYMAX)
 186             temp.translate(-logicX, -logicY);
 187         else if (align() == SVG_PRESERVEASPECTRATIO_XMIDYMIN || align() == SVG_PRESERVEASPECTRATIO_XMIDYMID || align() == SVG_PRESERVEASPECTRATIO_XMIDYMAX)
 188             temp.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight) / 2, -logicY);
 189         else
 190             temp.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight), -logicY);
 191     } else {
 192         temp.scale(physWidth / logicWidth, physWidth / logicWidth);
 193
 194         if (align() == SVG_PRESERVEASPECTRATIO_XMINYMIN || align() == SVG_PRESERVEASPECTRATIO_XMIDYMIN || align() == SVG_PRESERVEASPECTRATIO_XMAXYMIN)
 195             temp.translate(-logicX, -logicY);
 196         else if (align() == SVG_PRESERVEASPECTRATIO_XMINYMID || align() == SVG_PRESERVEASPECTRATIO_XMIDYMID || align() == SVG_PRESERVEASPECTRATIO_XMAXYMID)
 197             temp.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth) / 2);
 198         else
 199             temp.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth));
 200     }
 201
 202     return temp;
 203 }
 204
 205 }
 206
 207 // vim:ts=4:noet
 208 #endif // ENABLE(SVG)