/*
pygame - Python Game Library
Copyright (C) 2000-2001 Pete Shinners
Copyright (C) 2007 Marcus von Appen
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
Pete Shinners
pete@shinners.org
*/
#ifndef SURFACE_H
#define SURFACE_H
/* This is defined in SDL.h */
#if defined(_POSIX_C_SOURCE)
#undef _POSIX_C_SOURCE
#endif
#include <SDL.h>
#define PYGAME_BLEND_ADD 0x1
#define PYGAME_BLEND_SUB 0x2
#define PYGAME_BLEND_MULT 0x3
#define PYGAME_BLEND_MIN 0x4
#define PYGAME_BLEND_MAX 0x5
#define PYGAME_BLEND_RGB_ADD 0x1
#define PYGAME_BLEND_RGB_SUB 0x2
#define PYGAME_BLEND_RGB_MULT 0x3
#define PYGAME_BLEND_RGB_MIN 0x4
#define PYGAME_BLEND_RGB_MAX 0x5
#define PYGAME_BLEND_RGBA_ADD 0x6
#define PYGAME_BLEND_RGBA_SUB 0x7
#define PYGAME_BLEND_RGBA_MULT 0x8
#define PYGAME_BLEND_RGBA_MIN 0x9
#define PYGAME_BLEND_RGBA_MAX 0x10
#define PYGAME_BLEND_PREMULTIPLIED 0x11
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
#define GET_PIXEL_24(b) (b[0] + (b[1] << 8) + (b[2] << 16))
#else
#define GET_PIXEL_24(b) (b[2] + (b[1] << 8) + (b[0] << 16))
#endif
#define GET_PIXEL(pxl, bpp, source) \
switch (bpp) \
{ \
case 2: \
pxl = *((Uint16 *) (source)); \
break; \
case 4: \
pxl = *((Uint32 *) (source)); \
break; \
default: \
{ \
Uint8 *b = (Uint8 *) source; \
pxl = GET_PIXEL_24(b); \
} \
break; \
}
#define GET_PIXELVALS(_sR, _sG, _sB, _sA, px, fmt, ppa) \
_sR = ((px & fmt->Rmask) >> fmt->Rshift); \
_sR = (_sR << fmt->Rloss) + (_sR >> (8 - (fmt->Rloss << 1))); \
_sG = ((px & fmt->Gmask) >> fmt->Gshift); \
_sG = (_sG << fmt->Gloss) + (_sG >> (8 - (fmt->Gloss << 1))); \
_sB = ((px & fmt->Bmask) >> fmt->Bshift); \
_sB = (_sB << fmt->Bloss) + (_sB >> (8 - (fmt->Bloss << 1))); \
if (ppa) \
{ \
_sA = ((px & fmt->Amask) >> fmt->Ashift); \
_sA = (_sA << fmt->Aloss) + (_sA >> (8 - (fmt->Aloss << 1))); \
} \
else \
{ \
_sA = 255; \
}
#define GET_PIXELVALS_1(sr, sg, sb, sa, _src, _fmt) \
sr = _fmt->palette->colors[*((Uint8 *) (_src))].r; \
sg = _fmt->palette->colors[*((Uint8 *) (_src))].g; \
sb = _fmt->palette->colors[*((Uint8 *) (_src))].b; \
sa = 255;
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
#define SET_OFFSETS_24(or, og, ob, fmt) \
{ \
or = (fmt->Rshift == 0 ? 0 : \
fmt->Rshift == 8 ? 1 : \
2 ); \
og = (fmt->Gshift == 0 ? 0 : \
fmt->Gshift == 8 ? 1 : \
2 ); \
ob = (fmt->Bshift == 0 ? 0 : \
fmt->Bshift == 8 ? 1 : \
2 ); \
}
#define SET_OFFSETS_32(or, og, ob, fmt) \
{ \
or = (fmt->Rshift == 0 ? 0 : \
fmt->Rshift == 8 ? 1 : \
fmt->Rshift == 16 ? 2 : \
3 ); \
og = (fmt->Gshift == 0 ? 0 : \
fmt->Gshift == 8 ? 1 : \
fmt->Gshift == 16 ? 2 : \
3 ); \
ob = (fmt->Bshift == 0 ? 0 : \
fmt->Bshift == 8 ? 1 : \
fmt->Bshift == 16 ? 2 : \
3 ); \
}
#else
#define SET_OFFSETS_24(or, og, ob, fmt) \
{ \
or = (fmt->Rshift == 0 ? 2 : \
fmt->Rshift == 8 ? 1 : \
0 ); \
og = (fmt->Gshift == 0 ? 2 : \
fmt->Gshift == 8 ? 1 : \
0 ); \
ob = (fmt->Bshift == 0 ? 2 : \
fmt->Bshift == 8 ? 1 : \
0 ); \
}
#define SET_OFFSETS_32(or, og, ob, fmt) \
{ \
or = (fmt->Rshift == 0 ? 3 : \
fmt->Rshift == 8 ? 2 : \
fmt->Rshift == 16 ? 1 : \
0 ); \
og = (fmt->Gshift == 0 ? 3 : \
fmt->Gshift == 8 ? 2 : \
fmt->Gshift == 16 ? 1 : \
0 ); \
ob = (fmt->Bshift == 0 ? 3 : \
fmt->Bshift == 8 ? 2 : \
fmt->Bshift == 16 ? 1 : \
0 ); \
}
#endif
#define CREATE_PIXEL(buf, r, g, b, a, bp, ft) \
switch (bp) \
{ \
case 2: \
*((Uint16 *) (buf)) = \
((r >> ft->Rloss) << ft->Rshift) | \
((g >> ft->Gloss) << ft->Gshift) | \
((b >> ft->Bloss) << ft->Bshift) | \
((a >> ft->Aloss) << ft->Ashift); \
break; \
case 4: \
*((Uint32 *) (buf)) = \
((r >> ft->Rloss) << ft->Rshift) | \
((g >> ft->Gloss) << ft->Gshift) | \
((b >> ft->Bloss) << ft->Bshift) | \
((a >> ft->Aloss) << ft->Ashift); \
break; \
}
/* Pretty good idea from Tom Duff :-). */
#define LOOP_UNROLLED4(code, n, width) \
n = (width + 3) / 4; \
switch (width & 3) \
{ \
case 0: do { code; \
case 3: code; \
case 2: code; \
case 1: code; \
} while (--n > 0); \
}
/* Used in the srcbpp == dstbpp == 1 blend functions */
#define REPEAT_3(code) \
code; \
code; \
code;
#define REPEAT_4(code) \
code; \
code; \
code; \
code;
#define BLEND_ADD(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR + sR; dR = (tmp <= 255 ? tmp : 255); \
tmp = dG + sG; dG = (tmp <= 255 ? tmp : 255); \
tmp = dB + sB; dB = (tmp <= 255 ? tmp : 255);
#define BLEND_SUB(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR - sR; dR = (tmp >= 0 ? tmp : 0); \
tmp = dG - sG; dG = (tmp >= 0 ? tmp : 0); \
tmp = dB - sB; dB = (tmp >= 0 ? tmp : 0);
#define BLEND_MULT(sR, sG, sB, sA, dR, dG, dB, dA) \
dR = (dR && sR) ? (dR * sR) >> 8 : 0; \
dG = (dG && sG) ? (dG * sG) >> 8 : 0; \
dB = (dB && sB) ? (dB * sB) >> 8 : 0;
#define BLEND_MIN(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR < dR) { dR = sR; } \
if(sG < dG) { dG = sG; } \
if(sB < dB) { dB = sB; }
#define BLEND_MAX(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR > dR) { dR = sR; } \
if(sG > dG) { dG = sG; } \
if(sB > dB) { dB = sB; }
#define BLEND_RGBA_ADD(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR + sR; dR = (tmp <= 255 ? tmp : 255); \
tmp = dG + sG; dG = (tmp <= 255 ? tmp : 255); \
tmp = dB + sB; dB = (tmp <= 255 ? tmp : 255); \
tmp = dA + sA; dA = (tmp <= 255 ? tmp : 255);
#define BLEND_RGBA_SUB(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR - sR; dR = (tmp >= 0 ? tmp : 0); \
tmp = dG - sG; dG = (tmp >= 0 ? tmp : 0); \
tmp = dB - sB; dB = (tmp >= 0 ? tmp : 0); \
tmp = dA - sA; dA = (tmp >= 0 ? tmp : 0);
#define BLEND_RGBA_MULT(sR, sG, sB, sA, dR, dG, dB, dA) \
dR = (dR && sR) ? (dR * sR) >> 8 : 0; \
dG = (dG && sG) ? (dG * sG) >> 8 : 0; \
dB = (dB && sB) ? (dB * sB) >> 8 : 0; \
dA = (dA && sA) ? (dA * sA) >> 8 : 0;
#define BLEND_RGBA_MIN(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR < dR) { dR = sR; } \
if(sG < dG) { dG = sG; } \
if(sB < dB) { dB = sB; } \
if(sA < dA) { dA = sA; }
#define BLEND_RGBA_MAX(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR > dR) { dR = sR; } \
if(sG > dG) { dG = sG; } \
if(sB > dB) { dB = sB; } \
if(sA > dA) { dA = sA; }
#if 1
/* Choose an alpha blend equation. If the sign is preserved on a right shift
* then use a specialized, faster, equation. Otherwise a more general form,
* where all additions are done before the shift, is needed.
*/
#if (-1 >> 1) < 0
#define ALPHA_BLEND_COMP(sC, dC, sA) ((((sC - dC) * sA + sC) >> 8) + dC)
#else
#define ALPHA_BLEND_COMP(sC, dC, sA) (((dC << 8) + (sC - dC) * sA + sC) >> 8)
#endif
#define ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
if (dA) \
{ \
dR = ALPHA_BLEND_COMP(sR, dR, sA); \
dG = ALPHA_BLEND_COMP(sG, dG, sA); \
dB = ALPHA_BLEND_COMP(sB, dB, sA); \
dA = sA + dA - ((sA * dA) / 255); \
} \
else \
{ \
dR = sR; \
dG = sG; \
dB = sB; \
dA = sA; \
} \
} while(0)
#define ALPHA_BLEND_PREMULTIPLIED_COMP(sC, dC, sA) (sC + dC - ((dC * sA) >> 8))
#define ALPHA_BLEND_PREMULTIPLIED(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
tmp = ALPHA_BLEND_PREMULTIPLIED_COMP(sR, dR, sA); dR = (tmp > 255 ? 255 : tmp); \
tmp = ALPHA_BLEND_PREMULTIPLIED_COMP(sG, dG, sA); dG = (tmp > 255 ? 255 : tmp); \
tmp = ALPHA_BLEND_PREMULTIPLIED_COMP(sB, dB, sA); dB = (tmp > 255 ? 255 : tmp); \
dA = sA + dA - ((sA * dA) / 255); \
} while(0)
#elif 0
#define ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
if(sA){ \
if(dA && sA < 255){ \
int dContrib = dA*(255 - sA)/255; \
dA = sA+dA - ((sA*dA)/255); \
dR = (dR*dContrib + sR*sA)/dA; \
dG = (dG*dContrib + sG*sA)/dA; \
dB = (dB*dContrib + sB*sA)/dA; \
}else{ \
dR = sR; \
dG = sG; \
dB = sB; \
dA = sA; \
} \
} \
} while(0)
#endif
int
surface_fill_blend (SDL_Surface *surface, SDL_Rect *rect, Uint32 color,
int blendargs);
void
surface_respect_clip_rect (SDL_Surface *surface, SDL_Rect *rect);
int
pygame_AlphaBlit (SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect, int the_args);
int
pygame_Blit (SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect, int the_args);
#endif /* SURFACE_H */