sdlimageloader.cpp

00001 /*      _______   __   __   __   ______   __   __   _______   __   __
00002  *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
00003  *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
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00005  *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
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00007  * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
00008  *
00009  * Copyright (c) 2004, 2005, 2006 Olof Naessén and Per Larsson
00010  *
00011  *                                                         Js_./
00012  * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
00013  * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
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00055  */
00056 
00057 /*
00058  * For comments regarding functions please see the header file.
00059  */
00060 
00061 #include "guichan/sdl/sdlimage.hpp"
00062 
00063 #include "SDL_image.h"
00064 
00065 #include "guichan/exception.hpp"
00066 #include "guichan/sdl/sdlimageloader.hpp"
00067 
00068 namespace gcn
00069 {
00070     Image* SDLImageLoader::load(const std::string& filename,
00071                                 bool convertToDisplayFormat)
00072     {
00073         SDL_Surface *loadedSurface = loadSDLSurface(filename);
00074 
00075         if (loadedSurface == NULL)
00076         {
00077             throw GCN_EXCEPTION(
00078                     std::string("Unable to load image file: ") + filename);
00079         }
00080 
00081         SDL_Surface *surface = convertToStandardFormat(loadedSurface);
00082         SDL_FreeSurface(loadedSurface);
00083 
00084         if (surface == NULL)
00085         {
00086             throw GCN_EXCEPTION(
00087                     std::string("Not enough memory to load: ") + filename);
00088         }
00089 
00090         Image *image = new SDLImage(surface, true);
00091 
00092         if (convertToDisplayFormat)
00093         {
00094             image->convertToDisplayFormat();
00095         }
00096 
00097         return image;
00098     }
00099 
00100     SDL_Surface* SDLImageLoader::loadSDLSurface(const std::string& filename)
00101     {
00102         return IMG_Load(filename.c_str());
00103     }
00104 
00105     SDL_Surface* SDLImageLoader::convertToStandardFormat(SDL_Surface* surface)
00106     {
00107         Uint32 rmask, gmask, bmask, amask;
00108 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
00109         rmask = 0xff000000;
00110         gmask = 0x00ff0000;
00111         bmask = 0x0000ff00;
00112         amask = 0x000000ff;
00113 #else
00114         rmask = 0x000000ff;
00115         gmask = 0x0000ff00;
00116         bmask = 0x00ff0000;
00117         amask = 0xff000000;
00118 #endif
00119 
00120         SDL_Surface *colorSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
00121                 0, 0, 32,
00122                 rmask, gmask, bmask, amask);
00123 
00124         SDL_Surface *tmp = NULL;
00125 
00126         if (colorSurface != NULL)
00127         {
00128             tmp = SDL_ConvertSurface(surface, colorSurface->format,
00129                                      SDL_SWSURFACE);
00130             SDL_FreeSurface(colorSurface);
00131         }
00132 
00133         return tmp;
00134     }
00135 }

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