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( double 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);
  26     switch ( unit )
  27     {
  28         case SVG_LENGTH_UNIT_CM: fRet *= 72.0/2.54; break;
  29         case SVG_LENGTH_UNIT_IN: fRet *= 72.0; break;
  30         case SVG_LENGTH_UNIT_MM: fRet *= 72.0/25.4; break;
  31         case SVG_LENGTH_UNIT_PC: fRet *= 72.0/6.0; break;
  32         case SVG_LENGTH_UNIT_USER:
  33         case SVG_LENGTH_UNIT_PX: // no unit defaults to PX in svg,
  34                                  // assume display to have 72DPI
  35         case SVG_LENGTH_UNIT_PT: break;
  36         case SVG_LENGTH_UNIT_EM: fRet *= rState.mnFontSize; break;
  37         case SVG_LENGTH_UNIT_EX: fRet *= rState.mnFontSize / 2.0; break;
  38         case SVG_LENGTH_UNIT_PERCENTAGE:
  39         {
  40             double fBoxLen;
  41             if (rState.maViewBox.isEmpty())
  42             {
  43                 basegfx::B2DRange aDefaultBox(0, 0,
  44                   convLength(210, SVG_LENGTH_UNIT_MM, rState, 'h'),
  45                   convLength(297, SVG_LENGTH_UNIT_MM, rState, 'v'));
  46                 fBoxLen = (dir=='h' ? aDefaultBox.getWidth() :
  47                           (dir=='v' ? aDefaultBox.getHeight() :
  48                            aDefaultBox.getRange().getLength()));
  49             }
  50             else
  51             {
  52                 fBoxLen = (dir=='h' ? rState.maViewBox.getWidth() :
  53                           (dir=='v' ? rState.maViewBox.getHeight() :
  54                            rState.maViewBox.getRange().getLength()));
  55             }
  56
  57             fRet *= fBoxLen/100.0;
  58         }
  59         break;
  60         default: OSL_TRACE( "Unknown length type" ); break;
  61     }
  62
  63     return fRet;
  64 }
  65
  66 double convLength( const OUString& sValue, const State& rState, char dir )
  67 {
  68     //FIXME: convert deprecated spirit::classic to use spirit::qi
  69     using namespace ::boost::spirit::classic;
  70
  71     OString aUTF8 = OUStringToOString( sValue,
  72                                                  RTL_TEXTENCODING_UTF8 );
  73
  74     double  nVal=0.0;
  75     SvgUnit eUnit=SVG_LENGTH_UNIT_PX;
  76     const bool bRes = parse(aUTF8.getStr(),
  77         //  Begin grammar
  78         (
  79             real_p[assign_a(nVal)]
  80             >> (  str_p("cm") [assign_a(eUnit,SVG_LENGTH_UNIT_CM)]
  81                 | str_p("em") [assign_a(eUnit,SVG_LENGTH_UNIT_EM)]
  82                 | str_p("ex") [assign_a(eUnit,SVG_LENGTH_UNIT_EX)]
  83                 | str_p("in") [assign_a(eUnit,SVG_LENGTH_UNIT_IN)]
  84                 | str_p("mm") [assign_a(eUnit,SVG_LENGTH_UNIT_MM)]
  85                 | str_p("pc") [assign_a(eUnit,SVG_LENGTH_UNIT_PC)]
  86                 | str_p("pt") [assign_a(eUnit,SVG_LENGTH_UNIT_PT)]
  87                 | str_p("px") [assign_a(eUnit,SVG_LENGTH_UNIT_PX)]
  88                 | str_p("%") [assign_a(eUnit,SVG_LENGTH_UNIT_PERCENTAGE)]
  89                 | str_p("") [assign_a(eUnit,SVG_LENGTH_UNIT_USER)]
  90                 | end_p)
  91         ),
  92         //  End grammar
  93         space_p).full;
  94
  95     if( !bRes )
  96         return 0.0;
  97
  98     return convLength(nVal,eUnit,rState,dir);
  99 }
 100
 101 } // namespace svgi
 102
 103 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */