sdlimage.cpp

00001 /*      _______   __   __   __   ______   __   __   _______   __   __
00002  *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
00003  *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
00004  *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
00005  *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
00006  * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
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 "guichan/exception.hpp"
00064 #include "guichan/sdl/sdlpixel.hpp"
00065 
00066 namespace gcn
00067 {
00068     SDLImage::SDLImage(SDL_Surface* surface, bool autoFree)
00069     {
00070         mAutoFree = autoFree;
00071         mSurface = surface;
00072     }
00073 
00074     SDLImage::~SDLImage()
00075     {
00076         if (mAutoFree)
00077         {
00078             free();
00079         }
00080     }
00081 
00082     SDL_Surface* SDLImage::getSurface() const
00083     {
00084         return mSurface;
00085     }
00086 
00087     int SDLImage::getWidth() const
00088     {
00089         if (mSurface == NULL)
00090         {
00091             throw GCN_EXCEPTION("Trying to get the width of a non loaded image.");
00092         }
00093 
00094         return mSurface->w;
00095     }
00096 
00097     int SDLImage::getHeight() const
00098     {
00099         if (mSurface == NULL)
00100         {
00101             throw GCN_EXCEPTION("Trying to get the height of a non loaded image.");
00102         }
00103 
00104         return mSurface->h;
00105     }
00106 
00107     Color SDLImage::getPixel(int x, int y)
00108     {
00109         if (mSurface == NULL)
00110         {
00111             throw GCN_EXCEPTION("Trying to get a pixel from a non loaded image.");
00112         }
00113 
00114         return SDLgetPixel(mSurface, x, y);
00115     }
00116 
00117     void SDLImage::putPixel(int x, int y, const Color& color)
00118     {
00119         if (mSurface == NULL)
00120         {
00121             throw GCN_EXCEPTION("Trying to put a pixel in a non loaded image.");
00122         }
00123 
00124         SDLputPixel(mSurface, x, y, color);
00125     }
00126 
00127     void SDLImage::convertToDisplayFormat()
00128     {
00129         if (mSurface == NULL)
00130         {
00131             throw GCN_EXCEPTION("Trying to convert a non loaded image to display format.");
00132         }
00133 
00134         int i;
00135         bool hasPink = false;
00136         bool hasAlpha = false;
00137 
00138         for (i = 0; i < mSurface->w * mSurface->h; ++i)
00139         {
00140             if (((unsigned int*)mSurface->pixels)[i] == SDL_MapRGB(mSurface->format,255,0,255))
00141             {
00142                 hasPink = true;
00143                 break;
00144             }
00145         }
00146 
00147         for (i = 0; i < mSurface->w * mSurface->h; ++i)
00148         {
00149             Uint8 r, g, b, a;
00150 
00151             SDL_GetRGBA(((unsigned int*)mSurface->pixels)[i], mSurface->format,
00152                         &r, &g, &b, &a);
00153 
00154             if (a != 255)
00155             {
00156                 hasAlpha = true;
00157                 break;
00158             }
00159         }
00160 
00161         // Don't convert 32bpp images with alpha, it will destroy the
00162         // alpha channel.
00163         SDL_Surface *tmp;
00164         if (hasAlpha)
00165         {
00166             tmp = mSurface;
00167             mSurface = NULL;
00168         }
00169         else
00170         {
00171             tmp = SDL_DisplayFormat(mSurface);
00172             SDL_FreeSurface(mSurface);
00173             mSurface = NULL;
00174         }
00175 
00176         if (hasPink)
00177         {
00178             SDL_SetColorKey(tmp, SDL_SRCCOLORKEY,
00179                             SDL_MapRGB(tmp->format,255,0,255));
00180         }
00181         if (hasAlpha)
00182         {
00183             SDL_SetAlpha(tmp, SDL_SRCALPHA, 255);
00184         }
00185 
00186         mSurface = tmp;
00187     }
00188 
00189     void SDLImage::free()
00190     {
00191         SDL_FreeSurface(mSurface);
00192     }
00193 }

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