filter/source/svg/units.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include "units.hxx"
  11 #include <basegfx/range/b2drange.hxx>
  12 #include "gfxtypes.hxx"
  13 #include <rtl/ustring.hxx>
  14 #include <osl/diagnose.h>
  15 #include <boost/spirit/include/classic.hpp>
  16
  17 namespace svgi
  18 {
  19
  20 double convLength( const OUString& value, SvgUnit unit, const State& rState, char dir )
  21 {
  22     // convert svg unit to internal coordinates ("pixel"). Since the
  23     // OOo drawing layer is still largely integer-based, the initial
  24     // viewport transformation includes a certain scale factor
  25     double fRet(value.toDouble());
  26     switch ( unit )
  27     {
  28         case SVG_LENGTH_UNIT_CM: fRet *= F_SVG_PIXEL_PER_INCH/2.54; break;
  29         case SVG_LENGTH_UNIT_IN: fRet *= F_SVG_PIXEL_PER_INCH; break;
  30         case SVG_LENGTH_UNIT_MM: fRet *= F_SVG_PIXEL_PER_INCH/25.4; break;
  31         case SVG_LENGTH_UNIT_PC: fRet *= F_SVG_PIXEL_PER_INCH/6.0; break;
  32         case SVG_LENGTH_UNIT_PT: fRet *= F_SVG_PIXEL_PER_INCH/72.0; break;
  33         case SVG_LENGTH_UNIT_EM: fRet *= rState.mnFontSize; break;
  34         case SVG_LENGTH_UNIT_EX: fRet *= rState.mnFontSize / 2.0; break;
  35         case SVG_LENGTH_UNIT_USER:
  36         case SVG_LENGTH_UNIT_PX:
  37             // no unit defaults to PX in svg, assume display to have 90DPI
  38             break;
  39         case SVG_LENGTH_FONT_SIZE:
  40         {
  41             //In CSS2, the suggested scaling factor between adjacent indexes is 1.2
  42             if ( value == "xx-small" )
  43                 fRet = rState.mnFontSize / 1.728;
  44             else if ( value == "x-small" )
  45                 fRet = rState.mnFontSize / 1.44;
  46             else if ( value == "small" )
  47                 fRet = rState.mnFontSize / 1.2;
  48             else if ( value == "smaller" )
  49                 fRet = rState.mnParentFontSize / 1.2;
  50             else if ( value == "initial" || value == "medium" )
  51                 fRet = rState.mnFontSize;
  52             else if ( value == "larger" )
  53                 fRet = rState.mnParentFontSize * 1.2;
  54             else if ( value == "large" )
  55                 fRet = rState.mnFontSize * 1.2;
  56             else if ( value == "x-large" )
  57                 fRet = rState.mnFontSize * 1.44;
  58             else if ( value == "xx-large" )
  59                 fRet = rState.mnFontSize * 1.728;
  60
  61             break;
  62         }
  63         case SVG_LENGTH_UNIT_PERCENTAGE:
  64         {
  65             double fBoxLen;
  66             if (rState.maViewBox.isEmpty())
  67             {
  68                 basegfx::B2DRange aDefaultBox(0, 0,
  69                   convLength("210", SVG_LENGTH_UNIT_MM, rState, 'h'),
  70                   convLength("297", SVG_LENGTH_UNIT_MM, rState, 'v'));
  71                 fBoxLen = (dir=='h' ? aDefaultBox.getWidth() :
  72                           (dir=='v' ? aDefaultBox.getHeight() :
  73                            aDefaultBox.getRange().getLength()));
  74             }
  75             else
  76             {
  77                 fBoxLen = (dir=='h' ? rState.maViewBox.getWidth() :
  78                           (dir=='v' ? rState.maViewBox.getHeight() :
  79                            rState.maViewBox.getRange().getLength()));
  80             }
  81
  82             fRet *= fBoxLen/100.0;
  83         }
  84         break;
  85         default: OSL_TRACE( "Unknown length type" ); break;
  86     }
  87
  88     return fRet;
  89 }
  90
  91 double convLength( const OUString& sValue, const State& rState, char dir )
  92 {
  93     //FIXME: convert deprecated spirit::classic to use spirit::qi
  94     using namespace ::boost::spirit::classic;
  95
  96     OString aUTF8 = OUStringToOString( sValue,
  97                                                  RTL_TEXTENCODING_UTF8 );
  98
  99     std::string sVal;
 100     SvgUnit eUnit=SVG_LENGTH_UNIT_PX;
 101     const bool bRes = parse(aUTF8.getStr(),
 102         //  Begin grammar
 103         (
 104             //parse font-size keywords (ie: xx-large, medium )
 105             ( +(alpha_p) >> !(str_p("-") >> +alpha_p) )[assign_a(sVal)]
 106                 >> str_p("")[assign_a(eUnit,SVG_LENGTH_FONT_SIZE)] |
 107             //take the first part and ignore the units
 108             ( +(anychar_p -
 109              (str_p("cm") |
 110              str_p("em") |
 111              str_p("ex") |
 112              str_p("in") |
 113              str_p("mm") |
 114              str_p("pc") |
 115              str_p("pt") |
 116              str_p("px") |
 117              str_p("%")))
 118             )[assign_a(sVal)]
 119             >> (  str_p("cm") [assign_a(eUnit,SVG_LENGTH_UNIT_CM)]
 120                 | str_p("em") [assign_a(eUnit,SVG_LENGTH_UNIT_EM)]
 121                 | str_p("ex") [assign_a(eUnit,SVG_LENGTH_UNIT_EX)]
 122                 | str_p("in") [assign_a(eUnit,SVG_LENGTH_UNIT_IN)]
 123                 | str_p("mm") [assign_a(eUnit,SVG_LENGTH_UNIT_MM)]
 124                 | str_p("pc") [assign_a(eUnit,SVG_LENGTH_UNIT_PC)]
 125                 | str_p("pt") [assign_a(eUnit,SVG_LENGTH_UNIT_PT)]
 126                 | str_p("px") [assign_a(eUnit,SVG_LENGTH_UNIT_PX)]
 127                 | str_p("%") [assign_a(eUnit,SVG_LENGTH_UNIT_PERCENTAGE)]
 128                 | str_p("") [assign_a(eUnit,SVG_LENGTH_UNIT_USER)]
 129                 | end_p)
 130         ),
 131         //  End grammar
 132         space_p).full;
 133
 134     if( !bRes )
 135         return 0.0;
 136
 137     OUString oVal = OUString::createFromAscii(sVal.c_str()).replaceAll(",",".");
 138
 139     return convLength(oVal,eUnit,rState,dir);
 140 }
 141
 142 } // namespace svgi
 143
 144 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */