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pgsetpixel.cpp
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/*
ParaGUI - crossplatform widgetset
setpixel - draw a single pixel onto a surface
Copyright (C) 2000,2001,2002 Alexander Pipelka
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Alexander Pipelka
pipelka@teleweb.at
Last Update: $Author: upi $
Update Date: $Date: 2006/12/04 09:34:33 $
Source File: $Source: /cvsroot/openmortal/openmortal/src/paragui/pgsetpixel.cpp,v $
CVS/RCS Revision: $Revision: 1.1 $
Status: $State: Exp $
*/
#include "pgdraw.h"
void PG_Draw::SetPixel(int x, int y, const PG_Color& c, SDL_Surface * surface) {
static PG_Color old;
Uint8 ri,gi,bi;
static Uint32 pixel;
static Uint8 *bits;
static Uint8 bpp;
static SDL_Rect rect;
SDL_GetClipRect(surface, &rect);
if((x < rect.x) || (y < rect.y)) {
return;
}
if((x >= rect.x+rect.w) || (y >= rect.y+rect.h)) {
return;
}
bpp = surface->format->BytesPerPixel;
bits = ((Uint8 *) surface->pixels) + y * surface->pitch + x * bpp;
if(old != c) {
pixel = c.MapRGB(surface->format);
old = c;
}
/* Set the pixel */
switch (bpp) {
case 1:
*((Uint8 *) (bits)) = (Uint8) pixel;
break;
case 2:
*((Uint16 *) (bits)) = (Uint16) pixel;
break;
case 3: { /* Format/endian independent */
ri = (pixel >> surface->format->Rshift) & 0xFF;
gi = (pixel >> surface->format->Gshift) & 0xFF;
bi = (pixel >> surface->format->Bshift) & 0xFF;
*((bits) + surface->format->Rshift / 8) = ri;
*((bits) + surface->format->Gshift / 8) = gi;
*((bits) + surface->format->Bshift / 8) = bi;
}
break;
case 4:
*((Uint32 *) (bits)) = (Uint32) pixel;
break;
}
}

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