filter/source/svg/units.cxx

   1 /*************************************************************************
   2  *
   3  *    OpenOffice.org - a multi-platform office productivity suite
   4  *
   5  *    Author:
   6  *      Jan Holesovsky   <kendy@suse.cz>
   7  *      Fridrich Strba   <fridrich.strba@bluewin.ch>
   8  *      Thorsten Behrens <tbehrens@novell.com>
   9  *
  10  *      Copyright (C) 2008, Novell Inc.
  11  *
  12  *   The Contents of this file are made available subject to
  13  *   the terms of GNU Lesser General Public License Version 2.1.
  14  *
  15  ************************************************************************/
  16
  17 // MARKER(update_precomp.py): autogen include statement, do not remove
  18 #include "precompiled_filter.hxx"
  19
  20 #include "units.hxx"
  21 #include "gfxtypes.hxx"
  22 #include "spirit_supplements.hxx"
  23
  24 #include <string.h>
  25 #include <rtl/ustring.hxx>
  26
  27 #include <boost/bind.hpp>
  28 // workaround. spirit uses INT_MAX.
  29 #include <limits.h>
  30 #include <boost/spirit.hpp>
  31
  32
  33 namespace svgi
  34 {
  35
  36 double convLength( double value, SvgUnit unit, const State& rState, char dir )
  37 {
  38     // convert svg unit to internal coordinates ("pixel"). Since the
  39     // OOo drawing layer is still largely integer-based, the initial
  40     // viewport transformation includes a certain scale factor
  41     double fRet(value);
  42     switch ( unit )
  43     {
  44         case SVG_LENGTH_UNIT_CM: fRet *= 72.0/2.54; break;
  45         case SVG_LENGTH_UNIT_IN: fRet *= 72.0; break;
  46         case SVG_LENGTH_UNIT_MM: fRet *= 72.0/25.4; break;
  47         case SVG_LENGTH_UNIT_PC: fRet *= 72.0/6.0; break;
  48                 case SVG_LENGTH_UNIT_USER:
  49         case SVG_LENGTH_UNIT_PX: // no unit defaults to PX in svg,
  50                                  // assume display to have 72DPI
  51         case SVG_LENGTH_UNIT_PT: break;
  52         case SVG_LENGTH_UNIT_EM: fRet *= rState.mnFontSize; break;
  53         case SVG_LENGTH_UNIT_EX: fRet *= rState.mnFontSize / 2.0; break;
  54         case SVG_LENGTH_UNIT_PERCENTAGE:
  55         {
  56             double fBoxLen;
  57             if (rState.maViewBox.isEmpty())
  58             {
  59                 basegfx::B2DRange aDefaultBox(0, 0,
  60                   convLength(210, SVG_LENGTH_UNIT_MM, rState, 'h'),
  61                   convLength(297, SVG_LENGTH_UNIT_MM, rState, 'v'));
  62                 fBoxLen = (dir=='h' ? aDefaultBox.getWidth() :
  63                           (dir=='v' ? aDefaultBox.getHeight() :
  64                            aDefaultBox.getRange().getLength()));
  65             }
  66             else
  67             {
  68                 fBoxLen = (dir=='h' ? rState.maViewBox.getWidth() :
  69                           (dir=='v' ? rState.maViewBox.getHeight() :
  70                            rState.maViewBox.getRange().getLength()));
  71             }
  72
  73             fRet *= fBoxLen/100.0;
  74         }
  75         break;
  76         default: OSL_TRACE( "Unknown length type" ); break;
  77     }
  78
  79     return fRet;
  80 }
  81
  82 double convLength( const rtl::OUString& sValue, const State& rState, char dir )
  83 {
  84     using namespace ::boost::spirit;
  85
  86     rtl::OString aUTF8 = rtl::OUStringToOString( sValue,
  87                                                  RTL_TEXTENCODING_UTF8 );
  88
  89     double  nVal=0.0;
  90     SvgUnit eUnit=SVG_LENGTH_UNIT_PX;
  91     const bool bRes = parse(aUTF8.getStr(),
  92         //  Begin grammar
  93         (
  94             real_p[assign_a(nVal)]
  95             >> (  str_p("cm") [assign_a(eUnit,SVG_LENGTH_UNIT_CM)]
  96                 | str_p("em") [assign_a(eUnit,SVG_LENGTH_UNIT_EM)]
  97                 | str_p("ex") [assign_a(eUnit,SVG_LENGTH_UNIT_EX)]
  98                 | str_p("in") [assign_a(eUnit,SVG_LENGTH_UNIT_IN)]
  99                 | str_p("mm") [assign_a(eUnit,SVG_LENGTH_UNIT_MM)]
 100                 | str_p("pc") [assign_a(eUnit,SVG_LENGTH_UNIT_PC)]
 101                 | str_p("pt") [assign_a(eUnit,SVG_LENGTH_UNIT_PT)]
 102                 | str_p("px") [assign_a(eUnit,SVG_LENGTH_UNIT_PX)]
 103                 | str_p("%") [assign_a(eUnit,SVG_LENGTH_UNIT_PERCENTAGE)]
 104                 | str_p("") [assign_a(eUnit,SVG_LENGTH_UNIT_USER)]
 105                 | end_p)
 106         ),
 107         //  End grammar
 108         space_p).full;
 109
 110     if( !bRes )
 111         return 0.0;
 112
 113     return convLength(nVal,eUnit,rState,dir);
 114 }
 115
 116 } // namespace svgi