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5131 clevermous 1 
/*!
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  \file Draw_Circle.c
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  \author Mario Palomo
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  \author Jose M. de la Huerga Fernández
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  \author Pepe González Mora
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  \date 05-2002
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  This library is free software; you can redistribute it and/or
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  modify it under the terms of the GNU Library General Public
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  License as published by the Free Software Foundation; either
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  version 2 of the License, or (at your option) any later version.
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  This library is distributed in the hope that it will be useful,
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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  Library General Public License for more details.
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  You should have received a copy of the GNU Library General Public
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  License along with this library; if not, write to the Free Foundation,
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  Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define SDL_DRAW_PUTPIXEL_BPP(A, B, C)  \
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*(##A##(##B##(Uint8*)super->pixels + (y0+y)*super->pitch +               \
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                                          (x0+x)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0-y)*super->pitch +               \
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                                          (x0+x)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0+y)*super->pitch +               \
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                                          (x0-x)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0-y)*super->pitch +               \
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                                          (x0-x)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0+x)*super->pitch +               \
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                                          (x0+y)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0-x)*super->pitch +               \
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                                          (x0+y)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0+x)*super->pitch +               \
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                                          (x0-y)*SDL_DRAW_BPP)) = ##C##; \
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*(##A##(##B##(Uint8*)super->pixels + (y0-x)*super->pitch +               \
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                                          (x0-y)*SDL_DRAW_BPP)) = ##C##;
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#if SDL_DRAW_BPP == 1
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#define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP(0+,0+,color)
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#elif SDL_DRAW_BPP == 2
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#define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP((Uint16*),0+,color)
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#elif SDL_DRAW_BPP == 3
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#define SDL_DRAW_PUTPIXEL \
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  SDL_DRAW_PUTPIXEL_BPP(0+,1+,colorbyte1)   \
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  if (SDL_BYTEORDER == SDL_BIG_ENDIAN) {  \
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    SDL_DRAW_PUTPIXEL_BPP(0+,0+,colorbyte2)   \
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    SDL_DRAW_PUTPIXEL_BPP(0+,2+,colorbyte0) \
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  }else{                                  \
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    SDL_DRAW_PUTPIXEL_BPP(0+,0+,colorbyte0)   \
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    SDL_DRAW_PUTPIXEL_BPP(0+,2+,colorbyte2) \
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  }
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#elif SDL_DRAW_BPP == 4
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#define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP((Uint32*),0+,color)
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#endif /*SDL_DRAW_BPP*/
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void SDL_DRAWFUNCTION(SDL_Surface *super,
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                      Sint16 x0, Sint16 y0, Uint16 r,
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                      Uint32 color)
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{
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#if SDL_DRAW_BPP == 3
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  Uint8 colorbyte0 = (Uint8) (color & 0xff);
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  Uint8 colorbyte1 = (Uint8) ((color >> 8) & 0xff);
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  Uint8 colorbyte2 = (Uint8) ((color >> 16) & 0xff);
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#endif
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  Sint16 x = 0;
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  Sint16 y = r-1;     /*radius zero == draw nothing*/
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  Sint16 d = 3 - 2*r;
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  Sint16 diagonalInc = 10 - 4*r;
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  Sint16 rightInc = 6;
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  while (x <= y) {
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    SDL_DRAW_PUTPIXEL
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    if (d >=  0) {
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      d += diagonalInc;
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      diagonalInc += 8;
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      y -= 1;
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    } else {
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      d += rightInc;
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      diagonalInc += 4;
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    }
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    rightInc += 4;
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    x += 1;
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  }
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}/*Draw_Circle*/
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#undef SDL_DRAW_PUTPIXEL
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#undef SDL_DRAW_PUTPIXEL_BPP
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