subimage_loader.cpp

00001 /***************************************************************************
00002  *   Copyright (C) 2005-2008 by the FIFE team                              *
00003  *   http://www.fifengine.de                                               *
00004  *   This file is part of FIFE.                                            *
00005  *                                                                         *
00006  *   FIFE is free software; you can redistribute it and/or                 *
00007  *   modify it under the terms of the GNU Lesser General Public            *
00008  *   License as published by the Free Software Foundation; either          *
00009  *   version 2.1 of the License, or (at your option) any later version.    *
00010  *                                                                         *
00011  *   This library is distributed in the hope that it will be useful,       *
00012  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00013  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00014  *   Lesser General Public License for more details.                       *
00015  *                                                                         *
00016  *   You should have received a copy of the GNU Lesser General Public      *
00017  *   License along with this library; if not, write to the                 *
00018  *   Free Software Foundation, Inc.,                                       *
00019  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
00020  ***************************************************************************/
00021 
00022 // Standard C++ library includes
00023 #include <iostream>
00024 
00025 // 3rd party library includes
00026 #include <SDL.h>
00027 #include <boost/lexical_cast.hpp>
00028 
00029 // FIFE includes
00030 // These includes are split up in two parts, separated by one empty line
00031 // First block: files included from the FIFE root src directory
00032 // Second block: files included from the same folder
00033 #include "video/image.h"
00034 #include "video/renderbackend.h"
00035 #include "video/image_location.h"
00036 #include "util/base/fife_stdint.h"
00037 #include "util/resource/resource.h"
00038 #include "util/base/exception.h"
00039 #include "util/log/logger.h"
00040 
00041 #include "subimage_loader.h"
00042 
00043 namespace FIFE { 
00044     static Logger _log(LM_NATIVE_LOADERS);
00045     
00046     IResource* SubImageLoader::loadResource(const ResourceLocation& location) {
00047         const ImageLocation* loc = dynamic_cast<const ImageLocation*>(&location);
00048         if (!loc) {
00049             // Wrong location type given for subimage provider
00050             return NULL;
00051         }
00052         Image* r = loc->getParentSource();
00053         if (!r) {
00054             // No parent source assigned, cannot provide subimage
00055             return NULL;
00056         }
00057         SDL_Surface* src = r->getSurface();
00058         if (!src) {
00059             return NULL;
00060         }
00061         SDL_Rect src_rect;
00062         src_rect.x = loc->getXShift();
00063         src_rect.y = loc->getYShift();
00064         src_rect.w = loc->getWidth();
00065         src_rect.h = loc->getHeight();
00066 
00067         FL_DBG(_log, LMsg("subimage_loader")
00068             << " rect:" << Rect(src_rect.x,src_rect.y,src_rect.w,src_rect.h));
00069 
00070         uint32_t Amask = src->format->Amask ?  AMASK : 0;
00071         SDL_Surface* result = SDL_CreateRGBSurface(SDL_SWSURFACE, src_rect.w,  src_rect.h, 32,
00072                                                    RMASK, GMASK, BMASK, Amask);
00073         SDL_FillRect(result, NULL, 0);
00074         SDL_SetAlpha(src,0,SDL_ALPHA_OPAQUE);
00075         SDL_BlitSurface(src,&src_rect,result,0);
00076 
00077         Image* image = RenderBackend::instance()->createImage(result);
00078         image->setResourceLocation(location);
00079         return image;
00080     };
00081 
00082 }
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