khtml/imload/imagemanager.h

   1 /*
   2     Large image displaying library.
   3
   4     Copyright (C) 2004 Maks Orlovich (maksim@kde.org)
   5
   6     Permission is hereby granted, free of charge, to any person obtaining a copy
   7     of this software and associated documentation files (the "Software"), to deal
   8     in the Software without restriction, including without limitation the rights
   9     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10     copies of the Software, and to permit persons to whom the Software is
  11     furnished to do so, subject to the following conditions:
  12
  13     The above copyright notice and this permission notice shall be included in
  14     all copies or substantial portions of the Software.
  15
  16     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19     AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20     AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 */
  24
  25 #ifndef IMAGE_MANAGER_H
  26 #define IMAGE_MANAGER_H
  27
  28 #include "animtimer.h"
  29 #include "loaderdatabase.h"
  30 #include "tilecache.h"
  31 #include "updater.h"
  32
  33 class QPixmap;
  34
  35 namespace khtmlImLoad {
  36
  37 class ImageManager
  38 {
  39 private:
  40     static AnimTimer* anmTimer;
  41     static TileCache* imgCache;
  42     static TileCache* pixCache;
  43     static LoaderDatabase* loaderDB;
  44     static Updater*        theUpdater;
  45     static QPixmap*        emptyPix;
  46
  47     static unsigned int pixmapCacheSize();
  48     static unsigned int imageCacheSize();
  49
  50     static void initLoaders();
  51 public:
  52     // IMPORTANT: Don't even think about changing these to signed; it's security-critical
  53     // This method determines whether we'll ever accept an image so large
  54     static bool isAcceptableSize(unsigned width, unsigned height);
  55
  56     // IMPORTANT: Don't even think about changing these to signed; it's security-critical
  57     // Says whether the target size is OK to scale an image too. This is much
  58     // bigger than the above, as we store the actual data in the tile cache, so
  59     // we just need some control information, which is much smaller
  60     static bool isAcceptableScaleSize(unsigned width, unsigned height);
  61
  62     static AnimTimer* animTimer()
  63     {
  64         if (!anmTimer)
  65             anmTimer = new AnimTimer();
  66         return anmTimer;
  67     }
  68
  69     static TileCache* imageCache()
  70     {
  71         if (!imgCache)
  72             imgCache = new TileCache(imageCacheSize());
  73         return imgCache;
  74     }
  75
  76     static TileCache* pixmapCache()
  77     {
  78         if (!pixCache)
  79             pixCache = new TileCache(pixmapCacheSize());
  80         return pixCache;
  81     }
  82
  83     static Updater* updater()
  84     {
  85         if (!theUpdater)
  86             theUpdater = new Updater();
  87         return theUpdater;
  88     }
  89
  90     static LoaderDatabase* loaderDatabase()
  91     {
  92         if (!loaderDB)
  93         {
  94             loaderDB = new LoaderDatabase();
  95             initLoaders(); //Register built-in decoders
  96         }
  97         return loaderDB;
  98     }
  99 };
 100
 101 }
 102
 103 #endif
 104 // kate: indent-width 4; replace-tabs on; tab-width 4; space-indent on;