runtime/kioslave/thumbnail/exrcreator.cpp

   1 /*  This file is part of the KDE libraries
   2     Copyright (C) 2004 Brad Hards <bradh@frogmouth.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 "exrcreator.h"
  21
  22 #include <QImage>
  23
  24 #include <kdebug.h>
  25 #include <ksharedconfig.h>
  26 #include <kglobal.h>
  27 #include <QFile>
  28
  29 #include <ImfInputFile.h>
  30 #include <ImfPreviewImage.h>
  31
  32 #include <kconfiggroup.h>
  33
  34 extern "C"
  35 {
  36     KDE_EXPORT ThumbCreator *new_creator()
  37     {
  38         return new EXRCreator;
  39     }
  40 }
  41
  42 bool EXRCreator::create(const QString &path, int, int, QImage &img)
  43 {
  44     Imf::InputFile in ( path.toAscii() );
  45     const Imf::Header &h = in.header();
  46
  47     if ( h.hasPreviewImage() ) {
  48         kDebug() << "EXRcreator - using preview";
  49         const Imf::PreviewImage &preview = in.header().previewImage();
  50         QImage qpreview(preview.width(), preview.height(), QImage::Format_RGB32);
  51         for ( unsigned int y=0; y < preview.height(); y++ ) {
  52             for ( unsigned int x=0; x < preview.width(); x++ ) {
  53                 const Imf::PreviewRgba &q = preview.pixels()[x+(y*preview.width())];
  54                 qpreview.setPixel( x, y, qRgba(q.r, q.g, q.b, q.a) );
  55             }
  56         }
  57         img = qpreview;
  58         return true;
  59     } else {
  60         // do it the hard way
  61         // We ignore maximum size when just extracting the thumnail
  62         // from the header, but it is very expensive to render large
  63         // EXR images just to turn it into an icon, so we go back
  64         // to honoring it in here.
  65         kDebug() << "EXRcreator - using original image";
  66         KSharedConfig::Ptr config = KGlobal::config();
  67         KConfigGroup configGroup( config, "PreviewSettings" );
  68         unsigned long long maxSize = configGroup.readEntry( "MaximumSize", 1024*1024 /* 1MB */ );
  69         unsigned long long fileSize = QFile( path ).size();
  70         if ( (fileSize > 0) && (fileSize < maxSize) ) {
  71             if (!img.load( path )) {
  72                 return false;
  73             }
  74             if (img.depth() != 32)
  75                 img = img.convertToFormat( QImage::Format_RGB32 );
  76             return true;
  77         } else {
  78             return false;
  79         }
  80     }
  81 }
  82
  83 ThumbCreator::Flags EXRCreator::flags() const
  84 {
  85     return None;
  86 }