runtime/kioslave/thumbnail/svgcreator.cpp

   1 /*  This file is part of the KDE libraries
   2     Copyright (c) 2006 Pascal Létourneau <pascal.letourneau@kdemail.net>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License as published by the Free Software Foundation; either
   7     version 2 of the License, or (at your option) any later version.
   8
   9     This library is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12     Library General Public License for more details.
  13
  14     You should have received a copy of the GNU Library General Public License
  15     along with this library; see the file COPYING.LIB.  If not, write to
  16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17     Boston, MA 02110-1301, USA.
  18 */
  19
  20 #include "svgcreator.h"
  21
  22 #include <QImage>
  23 #include <QPainter>
  24
  25 #include <kdemacros.h>
  26 #include <ksvgrenderer.h>
  27
  28 extern "C"
  29 {
  30     KDE_EXPORT ThumbCreator *new_creator()
  31     {
  32         return new SvgCreator;
  33     }
  34 }
  35
  36 bool SvgCreator::create(const QString &path, int w, int h, QImage &img)
  37 {
  38     KSvgRenderer r(path);
  39     if ( !r.isValid() )
  40         return false;
  41
  42     // render using the correct ratio
  43     const double ratio = static_cast<double>(r.defaultSize().height()) /
  44                          static_cast<double>(r.defaultSize().width());
  45     if (w < h)
  46         h = qRound(ratio * w);
  47     else
  48         w = qRound(h / ratio);
  49
  50     QImage i(w, h, QImage::Format_ARGB32_Premultiplied);
  51     i.fill(0);
  52     QPainter p(&i);
  53     r.render(&p);
  54     img = i;
  55     return true;
  56 }
  57
  58 ThumbCreator::Flags SvgCreator::flags() const
  59 {
  60     return None;
  61 }