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Draw_HLine.c
125 lines (102 loc) · 3.73 KB
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Draw_HLine.c
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/*!
\file Draw_HLine.c
\author Mario Palomo <mpalomo@ihman.com>
\author Jose M. de la Huerga Fernández
\author Pepe González Mora
\date 05-2002
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
*/
#if SDL_DRAW_BPP == 1
#define SDL_DRAW_PUTPIXEL \
memset(p, color, x1-x0+1);
#elif SDL_DRAW_BPP == 2
#define SDL_DRAW_PUTPIXEL \
i = x1-x0+1; \
switch( i % 4 ) { \
do{ \
case 0: *(Uint16*)p = color; p+=2; \
case 3: *(Uint16*)p = color; p+=2; \
case 2: *(Uint16*)p = color; p+=2; \
case 1: *(Uint16*)p = color; p+=2; \
}while( (i-=4) > 0 ); \
}
#elif SDL_DRAW_BPP == 3
#define SDL_DRAW_PUTPIXEL_BPP_3_AUX \
if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
p[0] = colorbyte2; \
p[1] = colorbyte1; \
p[2] = colorbyte0; \
} else { \
p[0] = colorbyte0; \
p[1] = colorbyte1; \
p[2] = colorbyte2; \
}
#define SDL_DRAW_PUTPIXEL \
i = x1-x0+1; \
switch( i % 4 ) { \
do{ \
case 0: SDL_DRAW_PUTPIXEL_BPP_3_AUX p+=3; \
case 3: SDL_DRAW_PUTPIXEL_BPP_3_AUX p+=3; \
case 2: SDL_DRAW_PUTPIXEL_BPP_3_AUX p+=3; \
case 1: SDL_DRAW_PUTPIXEL_BPP_3_AUX p+=3; \
}while( (i-=4) > 0 ); \
}
#elif SDL_DRAW_BPP == 4
#ifdef __linux__
#define SDL_DRAW_WMEMSET_START \
if (sizeof(wchar_t) == sizeof(Uint32)) { \
wmemset((wchar_t*)p, color, x1-x0+1); \
} else {
#define SDL_DRAW_WMEMSET_END }
#else
#define SDL_DRAW_WMEMSET_START
#define SDL_DRAW_WMEMSET_END
#endif
#define SDL_DRAW_PUTPIXEL \
SDL_DRAW_WMEMSET_START \
i = x1-x0+1; \
switch( i % 4 ) { \
do{ \
case 0: *(Uint32*)p = color; p+=4; \
case 3: *(Uint32*)p = color; p+=4; \
case 2: *(Uint32*)p = color; p+=4; \
case 1: *(Uint32*)p = color; p+=4; \
}while( (i-=4) > 0 ); \
} \
SDL_DRAW_WMEMSET_END
#endif /*SDL_DRAW_BPP*/
void SDL_DRAWFUNCTION(SDL_Surface *super,
Sint16 x0,Sint16 y0, Sint16 x1,
Uint32 color)
{
#if SDL_DRAW_BPP == 3
Uint8 colorbyte0 = (Uint8) (color & 0xff);
Uint8 colorbyte1 = (Uint8) ((color >> 8) & 0xff);
Uint8 colorbyte2 = (Uint8) ((color >> 16) & 0xff);
#endif
register Uint8 *p;
register Sint16 i;
if (x0 > x1) { i=x1; x1=x0; x0=i; }
p = (Uint8*)super->pixels + y0 * super->pitch + x0 * SDL_DRAW_BPP;
/* Lock surface */
if (SDL_MUSTLOCK(super)) {
if (SDL_LockSurface(super) < 0) { return; }
}
SDL_DRAW_PUTPIXEL
/* Unlock surface */
if (SDL_MUSTLOCK(super)) { SDL_UnlockSurface(super); }
}/*Draw_HLine*/
#undef SDL_DRAW_PUTPIXEL
#undef SDL_DRAW_PUTPIXEL_BPP_3_AUX
#undef SDL_DRAW_WMEMSET_START
#undef SDL_DRAW_WMEMSET_END