ImageManager/ImageLoader.h

   1 /* Copyright (C) 2003-2006 Jesper K. Pedersen <blackie@kde.org>
   2
   3    This program is free software; you can redistribute it and/or
   4    modify it under the terms of the GNU General Public
   5    License as published by the Free Software Foundation; either
   6    version 2 of the License, or (at your option) any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11    General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; see the file COPYING.  If not, write to
  15    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16    Boston, MA 02110-1301, USA.
  17 */
  18
  19 #ifndef IMAGELOADER_H
  20 #define IMAGELOADER_H
  21
  22 #include <qthread.h>
  23 #include <QImage>
  24
  25 namespace ImageManager
  26 {
  27 class Manager;
  28 class ImageRequest;
  29 class ThumbnailStorage;
  30
  31 class ImageLoader :public QThread {
  32 public:
  33     ImageLoader(ThumbnailStorage* storage);
  34     static QImage rotateAndScale( QImage, int width, int height, int angle );
  35     QImage tryLoadThumbnail( ImageRequest* request, bool& ok );
  36     void writeThumbnail( ImageRequest* request, QImage image );
  37
  38     static QString thumbnailKey( QString uri, int dim );
  39
  40 protected:
  41     virtual void run();
  42     QImage loadImage( ImageRequest* request, bool& ok );
  43     static int calcLoadSize( ImageRequest* request );
  44     QImage scaleAndRotate( ImageRequest* request, QImage img );
  45     static QString thumbnailKey( ImageRequest* request );
  46     static QString requestURL( ImageRequest* request );
  47     bool shouldImageBeScale( const QImage& img, ImageRequest* request );
  48
  49 private:
  50     ThumbnailStorage *const _storage;
  51 };
  52
  53 }
  54
  55 #endif /* IMAGELOADER_H */
  56