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/*
Ruby/SDL Ruby extension library for SDL
Copyright (C) 2001-2007 Ohbayashi Ippei
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* this file is copied from SGE library.
*/
/* sge's copyright */
/*
*
*
* SDL Graphics Extension
* Basic drawing functions
*
* Started 990815
*
* License: LGPL v2+ (see the file LICENSE)
* (c)1999-2001 Anders Lindstr
*/
/* pixel access functions,from sge_draw.cpp */
#include "rubysdl.h"
#if SDL_VERSIONNUM(SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL) >= SDL_VERSIONNUM(1, 1, 5)
#define clip_xmin(pnt) pnt->clip_rect.x
#define clip_xmax(pnt) pnt->clip_rect.x + pnt->clip_rect.w-1
#define clip_ymin(pnt) pnt->clip_rect.y
#define clip_ymax(pnt) pnt->clip_rect.y + pnt->clip_rect.h-1
#else
#define clip_xmin(pnt) pnt->clip_minx
#define clip_xmax(pnt) pnt->clip_maxx
#define clip_ymin(pnt) pnt->clip_miny
#define clip_ymax(pnt) pnt->clip_maxy
#endif
#ifdef HAVE_SGE
#include <sge.h>
#endif
void rubysdl_putPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
{
#ifdef HAVE_SGE
sge_PutPixel(surface,x, y, color);
#else
Uint8 *pix;
int shift;
if(x>=clip_xmin(surface) && x<=clip_xmax(surface) &&
y>=clip_ymin(surface) && y<=clip_ymax(surface)){
switch (surface->format->BytesPerPixel) {
case 1: /* Assuming 8-bpp */
*((Uint8 *)surface->pixels + y*surface->pitch + x) = color;
break;
case 2: /* Probably 15-bpp or 16-bpp */
*((Uint16 *)surface->pixels + y*surface->pitch/2 + x) = color;
break;
case 3: /* Slow 24-bpp mode, usually not used */
/* Gack - slow, but endian correct */
pix = (Uint8 *)surface->pixels + y * surface->pitch + x*3;
shift = surface->format->Rshift;
*(pix+shift/8) = color>>shift;
shift = surface->format->Gshift;
*(pix+shift/8) = color>>shift;
shift = surface->format->Bshift;
*(pix+shift/8) = color>>shift;
break;
case 4: /* Probably 32-bpp */
*((Uint32 *)surface->pixels + y*surface->pitch/4 + x) = color;
break;
}
}
#endif
}
Uint32 rubysdl_getPixel(SDL_Surface *surface, Sint16 x, Sint16 y)
{
#ifdef HAVE_SGE
return sge_GetPixel(surface, x, y);
#else
Uint8 *pix;
int shift;
Uint32 color=0;
switch (surface->format->BytesPerPixel) {
case 1: /* Assuming 8-bpp */
return *((Uint8 *)surface->pixels + y*surface->pitch + x);
break;
case 2: /* Probably 15-bpp or 16-bpp */
return *((Uint16 *)surface->pixels + y*surface->pitch/2 + x);
break;
case 3: /* Slow 24-bpp mode, usually not used */
pix = (Uint8 *)surface->pixels + y * surface->pitch + x*3;
shift = surface->format->Rshift;
color = *(pix+shift/8)<<shift;
shift = surface->format->Gshift;
color|= *(pix+shift/8)<<shift;
shift = surface->format->Bshift;
color|= *(pix+shift/8)<<shift;
shift = surface->format->Ashift;
color|= *(pix+shift/8)<<shift;
return color;
break;
case 4: /* Probably 32-bpp */
return *((Uint32 *)surface->pixels + y*surface->pitch/4 + x);
break;
}
return 0;
#endif
}
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