/* 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 #include "pygame.h" /* Blend modes */ #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 #define PYGAME_BLEND_ALPHA_SDL2 0x12 #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) \ SDL_GetRGBA(px, fmt, &(_sR), &(_sG), &(_sB), &(_sA)); \ if (!ppa) { \ _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; /* For 1 byte palette pixels */ #define SET_PIXELVAL(px, fmt, _dR, _dG, _dB, _dA) \ *(px) = (Uint8)SDL_MapRGBA(fmt, _dR, _dG, _dB, _dA) #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) + 255) >> 8 : 0; \ dG = (dG && sG) ? ((dG * sG) + 255) >> 8 : 0; \ dB = (dB && sB) ? ((dB * sB) + 255) >> 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) + 255) >> 8 : 0; \ dG = (dG && sG) ? ((dG * sG) + 255) >> 8 : 0; \ dB = (dB && sB) ? ((dB * sB) + 255) >> 8 : 0; \ dA = (dA && sA) ? ((dA * sA) + 255) >> 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 + 1) * sA >> 8)) #define ALPHA_BLEND_PREMULTIPLIED(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \ do { \ dR = ALPHA_BLEND_PREMULTIPLIED_COMP(sR, dR, sA); \ dG = ALPHA_BLEND_PREMULTIPLIED_COMP(sG, dG, sA); \ dB = ALPHA_BLEND_PREMULTIPLIED_COMP(sB, dB, sA); \ dA = ALPHA_BLEND_PREMULTIPLIED_COMP(sA, dA, sA); \ } 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); int premul_surf_color_by_alpha(SDL_Surface *src, SDL_Surface *dst); int pg_warn_simd_at_runtime_but_uncompiled(); #endif /* SURFACE_H */