Mercurial > sdl-ios-xcode
view src/video/SDL_blit_0.c @ 833:31fa08b36380
Added support for SDL_VIDEO_WINDOW_POS and SDL_VIDEO_CENTERED on Windows
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 16 Feb 2004 21:09:24 +0000 |
parents | b8d311d90021 |
children | e9d23bb80140 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga 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 Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif #include <stdio.h> #include <string.h> #include "SDL_types.h" #include "SDL_video.h" #include "SDL_blit.h" /* Functions to blit from bitmaps to other surfaces */ static void BlitBto1(SDL_BlitInfo *info) { int c; int width, height; Uint8 *src, *map, *dst; int srcskip, dstskip; /* Set up some basic variables */ width = info->d_width; height = info->d_height; src = info->s_pixels; srcskip = info->s_skip; dst = info->d_pixels; dstskip = info->d_skip; map = info->table; srcskip += width-(width+7)/8; if ( map ) { while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { *dst = map[bit]; } dst++; byte <<= 1; } src += srcskip; dst += dstskip; } } else { while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { *dst = bit; } dst++; byte <<= 1; } src += srcskip; dst += dstskip; } } } static void BlitBto2(SDL_BlitInfo *info) { int c; int width, height; Uint8 *src; Uint16 *map, *dst; int srcskip, dstskip; /* Set up some basic variables */ width = info->d_width; height = info->d_height; src = info->s_pixels; srcskip = info->s_skip; dst = (Uint16 *)info->d_pixels; dstskip = info->d_skip/2; map = (Uint16 *)info->table; srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { *dst = map[bit]; } byte <<= 1; dst++; } src += srcskip; dst += dstskip; } } static void BlitBto3(SDL_BlitInfo *info) { int c, o; int width, height; Uint8 *src, *map, *dst; int srcskip, dstskip; /* Set up some basic variables */ width = info->d_width; height = info->d_height; src = info->s_pixels; srcskip = info->s_skip; dst = info->d_pixels; dstskip = info->d_skip; map = info->table; srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { o = bit * 4; dst[0] = map[o++]; dst[1] = map[o++]; dst[2] = map[o++]; } byte <<= 1; dst += 3; } src += srcskip; dst += dstskip; } } static void BlitBto4(SDL_BlitInfo *info) { int width, height; Uint8 *src; Uint32 *map, *dst; int srcskip, dstskip; int c; /* Set up some basic variables */ width = info->d_width; height = info->d_height; src = info->s_pixels; srcskip = info->s_skip; dst = (Uint32 *)info->d_pixels; dstskip = info->d_skip/4; map = (Uint32 *)info->table; srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { *dst = map[bit]; } byte <<= 1; dst++; } src += srcskip; dst += dstskip; } } static void BlitBto1Key(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint8 *dst = info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; Uint32 ckey = info->src->colorkey; Uint8 *palmap = info->table; int c; /* Set up some basic variables */ srcskip += width-(width+7)/8; if ( palmap ) { while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { *dst = palmap[bit]; } dst++; byte <<= 1; } src += srcskip; dst += dstskip; } } else { while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { *dst = bit; } dst++; byte <<= 1; } src += srcskip; dst += dstskip; } } } static void BlitBto2Key(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint16 *dstp = (Uint16 *)info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; Uint32 ckey = info->src->colorkey; Uint8 *palmap = info->table; int c; /* Set up some basic variables */ srcskip += width-(width+7)/8; dstskip /= 2; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { *dstp=((Uint16 *)palmap)[bit]; } byte <<= 1; dstp++; } src += srcskip; dstp += dstskip; } } static void BlitBto3Key(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint8 *dst = info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; Uint32 ckey = info->src->colorkey; Uint8 *palmap = info->table; int c; /* Set up some basic variables */ srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { memcpy(dst, &palmap[bit*4], 3); } byte <<= 1; dst += 3; } src += srcskip; dst += dstskip; } } static void BlitBto4Key(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint32 *dstp = (Uint32 *)info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; Uint32 ckey = info->src->colorkey; Uint8 *palmap = info->table; int c; /* Set up some basic variables */ srcskip += width-(width+7)/8; dstskip /= 4; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { *dstp=((Uint32 *)palmap)[bit]; } byte <<= 1; dstp++; } src += srcskip; dstp += dstskip; } } static void BlitBtoNAlpha(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint8 *dst = info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; const SDL_Color *srcpal = info->src->palette->colors; SDL_PixelFormat *dstfmt = info->dst; int dstbpp; int c; const int A = info->src->alpha; /* Set up some basic variables */ dstbpp = dstfmt->BytesPerPixel; srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( 1 ) { Uint32 pixel; unsigned sR, sG, sB; unsigned dR, dG, dB; sR = srcpal[bit].r; sG = srcpal[bit].g; sB = srcpal[bit].b; DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB); ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); } byte <<= 1; dst += dstbpp; } src += srcskip; dst += dstskip; } } static void BlitBtoNAlphaKey(SDL_BlitInfo *info) { int width = info->d_width; int height = info->d_height; Uint8 *src = info->s_pixels; Uint8 *dst = info->d_pixels; int srcskip = info->s_skip; int dstskip = info->d_skip; SDL_PixelFormat *srcfmt = info->src; SDL_PixelFormat *dstfmt = info->dst; const SDL_Color *srcpal = srcfmt->palette->colors; int dstbpp; int c; const int A = srcfmt->alpha; Uint32 ckey = srcfmt->colorkey; /* Set up some basic variables */ dstbpp = dstfmt->BytesPerPixel; srcskip += width-(width+7)/8; while ( height-- ) { Uint8 byte = 0, bit; for ( c=0; c<width; ++c ) { if ( (c&7) == 0 ) { byte = *src++; } bit = (byte&0x80)>>7; if ( bit != ckey ) { int sR, sG, sB; int dR, dG, dB; Uint32 pixel; sR = srcpal[bit].r; sG = srcpal[bit].g; sB = srcpal[bit].b; DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB); ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); } byte <<= 1; dst += dstbpp; } src += srcskip; dst += dstskip; } } static SDL_loblit bitmap_blit[] = { NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 }; static SDL_loblit colorkey_blit[] = { NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key }; SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) { int which; if ( surface->map->dst->format->BitsPerPixel < 8 ) { which = 0; } else { which = surface->map->dst->format->BytesPerPixel; } switch(blit_index) { case 0: /* copy */ return bitmap_blit[which]; case 1: /* colorkey */ return colorkey_blit[which]; case 2: /* alpha */ return which >= 2 ? BlitBtoNAlpha : NULL; case 4: /* alpha + colorkey */ return which >= 2 ? BlitBtoNAlphaKey : NULL; } return NULL; }