src/video/SDL_blit_0.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 16 May 2005 05:55:17 +0000
changeset 1058 e6c91fd1911e
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permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "SDL_types.h"
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#include "SDL_video.h"
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#include "SDL_blit.h"
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/* Functions to blit from bitmaps to other surfaces */
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static void BlitBto1(SDL_BlitInfo *info)
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{
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	int c;
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	int width, height;
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	Uint8 *src, *map, *dst;
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	int srcskip, dstskip;
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	/* Set up some basic variables */
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	width = info->d_width;
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	height = info->d_height;
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	src = info->s_pixels;
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	srcskip = info->s_skip;
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	dst = info->d_pixels;
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	dstskip = info->d_skip;
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	map = info->table;
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	srcskip += width-(width+7)/8;
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	if ( map ) {
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		while ( height-- ) {
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		        Uint8 byte = 0, bit;
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	    		for ( c=0; c<width; ++c ) {
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				if ( (c&7) == 0 ) {
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					byte = *src++;
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				}
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				bit = (byte&0x80)>>7;
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				if ( 1 ) {
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				  *dst = map[bit];
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				}
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				dst++;
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				byte <<= 1;
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			}
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			src += srcskip;
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			dst += dstskip;
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		}
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	} else {
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		while ( height-- ) {
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		        Uint8 byte = 0, bit;
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	    		for ( c=0; c<width; ++c ) {
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				if ( (c&7) == 0 ) {
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					byte = *src++;
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				}
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				bit = (byte&0x80)>>7;
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				if ( 1 ) {
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				  *dst = bit;
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				}
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				dst++;
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				byte <<= 1;
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			}
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			src += srcskip;
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			dst += dstskip;
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		}
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	}
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}
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static void BlitBto2(SDL_BlitInfo *info)
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{
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	int c;
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	int width, height;
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	Uint8 *src;
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	Uint16 *map, *dst;
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	int srcskip, dstskip;
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	/* Set up some basic variables */
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	width = info->d_width;
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	height = info->d_height;
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	src = info->s_pixels;
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	srcskip = info->s_skip;
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	dst = (Uint16 *)info->d_pixels;
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	dstskip = info->d_skip/2;
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	map = (Uint16 *)info->table;
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	srcskip += width-(width+7)/8;
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	while ( height-- ) {
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	        Uint8 byte = 0, bit;
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	    	for ( c=0; c<width; ++c ) {
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			if ( (c&7) == 0 ) {
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				byte = *src++;
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			}
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			bit = (byte&0x80)>>7;
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			if ( 1 ) {
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				*dst = map[bit];
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			}
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			byte <<= 1;
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			dst++;
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		}
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		src += srcskip;
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		dst += dstskip;
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	}
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}
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static void BlitBto3(SDL_BlitInfo *info)
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{
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	int c, o;
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	int width, height;
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	Uint8 *src, *map, *dst;
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	int srcskip, dstskip;
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	/* Set up some basic variables */
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	width = info->d_width;
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	height = info->d_height;
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	src = info->s_pixels;
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	srcskip = info->s_skip;
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	dst = info->d_pixels;
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	dstskip = info->d_skip;
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	map = info->table;
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	srcskip += width-(width+7)/8;
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	while ( height-- ) {
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	        Uint8 byte = 0, bit;
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	    	for ( c=0; c<width; ++c ) {
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			if ( (c&7) == 0 ) {
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				byte = *src++;
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			}
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			bit = (byte&0x80)>>7;
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			if ( 1 ) {
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				o = bit * 4;
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				dst[0] = map[o++];
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				dst[1] = map[o++];
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				dst[2] = map[o++];
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			}
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			byte <<= 1;
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			dst += 3;
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		}
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		src += srcskip;
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		dst += dstskip;
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	}
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}
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static void BlitBto4(SDL_BlitInfo *info)
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{
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	int width, height;
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	Uint8 *src;
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	Uint32 *map, *dst;
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	int srcskip, dstskip;
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	int c;
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	/* Set up some basic variables */
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	width = info->d_width;
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	height = info->d_height;
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	src = info->s_pixels;
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	srcskip = info->s_skip;
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	dst = (Uint32 *)info->d_pixels;
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	dstskip = info->d_skip/4;
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	map = (Uint32 *)info->table;
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	srcskip += width-(width+7)/8;
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	while ( height-- ) {
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	        Uint8 byte = 0, bit;
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	    	for ( c=0; c<width; ++c ) {
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			if ( (c&7) == 0 ) {
0
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				byte = *src++;
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			}
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			bit = (byte&0x80)>>7;
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			if ( 1 ) {
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				*dst = map[bit];
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			}
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			byte <<= 1;
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			dst++;
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		}
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		src += srcskip;
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		dst += dstskip;
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	}
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}
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static void BlitBto1Key(SDL_BlitInfo *info)
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{
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        int width = info->d_width;
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	int height = info->d_height;
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	Uint8 *src = info->s_pixels;
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	Uint8 *dst = info->d_pixels;
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	int srcskip = info->s_skip;
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	int dstskip = info->d_skip;
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	Uint32 ckey = info->src->colorkey;
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	Uint8 *palmap = info->table;
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	int c;
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	/* Set up some basic variables */
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	srcskip += width-(width+7)/8;
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	if ( palmap ) {
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		while ( height-- ) {
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		        Uint8  byte = 0, bit;
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	    		for ( c=0; c<width; ++c ) {
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				if ( (c&7) == 0 ) {
0
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					byte = *src++;
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				}
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				bit = (byte&0x80)>>7;
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				if ( bit != ckey ) {
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				  *dst = palmap[bit];
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				}
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				dst++;
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				byte <<= 1;
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			}
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			src += srcskip;
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			dst += dstskip;
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		}
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	} else {
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		while ( height-- ) {
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		        Uint8  byte = 0, bit;
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	    		for ( c=0; c<width; ++c ) {
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				if ( (c&7) == 0 ) {
0
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					byte = *src++;
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				}
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				bit = (byte&0x80)>>7;
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				if ( bit != ckey ) {
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				  *dst = bit;
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				}
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				dst++;
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				byte <<= 1;
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			}
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			src += srcskip;
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			dst += dstskip;
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		}
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	}
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}
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static void BlitBto2Key(SDL_BlitInfo *info)
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{
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        int width = info->d_width;
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	int height = info->d_height;
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	Uint8 *src = info->s_pixels;
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	Uint16 *dstp = (Uint16 *)info->d_pixels;
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	int srcskip = info->s_skip;
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	int dstskip = info->d_skip;
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	Uint32 ckey = info->src->colorkey;
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	Uint8 *palmap = info->table;
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	int c;
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	/* Set up some basic variables */
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	srcskip += width-(width+7)/8;
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	dstskip /= 2;
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	while ( height-- ) {
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	        Uint8 byte = 0, bit;
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	    	for ( c=0; c<width; ++c ) {
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			if ( (c&7) == 0 ) {
0
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				byte = *src++;
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			}
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			bit = (byte&0x80)>>7;
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			if ( bit != ckey ) {
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				*dstp=((Uint16 *)palmap)[bit];
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			}
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			byte <<= 1;
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			dstp++;
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		}
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		src += srcskip;
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		dstp += dstskip;
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	}
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}
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static void BlitBto3Key(SDL_BlitInfo *info)
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{
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        int width = info->d_width;
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	int height = info->d_height;
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	Uint8 *src = info->s_pixels;
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	Uint8 *dst = info->d_pixels;
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	int srcskip = info->s_skip;
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	int dstskip = info->d_skip;
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	Uint32 ckey = info->src->colorkey;
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	Uint8 *palmap = info->table;
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	int c;
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	/* Set up some basic variables */
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	srcskip += width-(width+7)/8;
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	while ( height-- ) {
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	        Uint8  byte = 0, bit;
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	    	for ( c=0; c<width; ++c ) {
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			if ( (c&7) == 0 ) {
0
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				byte = *src++;
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   304
			}
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			bit = (byte&0x80)>>7;
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   306
			if ( bit != ckey ) {
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   307
				memcpy(dst, &palmap[bit*4], 3);
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   308
			}
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   309
			byte <<= 1;
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   310
			dst += 3;
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   311
		}
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   312
		src += srcskip;
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   313
		dst += dstskip;
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   314
	}
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}
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   317
static void BlitBto4Key(SDL_BlitInfo *info)
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diff changeset
   318
{
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   319
        int width = info->d_width;
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diff changeset
   320
	int height = info->d_height;
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parents:
diff changeset
   321
	Uint8 *src = info->s_pixels;
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diff changeset
   322
	Uint32 *dstp = (Uint32 *)info->d_pixels;
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parents:
diff changeset
   323
	int srcskip = info->s_skip;
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parents:
diff changeset
   324
	int dstskip = info->d_skip;
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parents:
diff changeset
   325
	Uint32 ckey = info->src->colorkey;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   326
	Uint8 *palmap = info->table;
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parents:
diff changeset
   327
	int c;
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parents:
diff changeset
   328
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parents:
diff changeset
   329
	/* Set up some basic variables */
74212992fb08 Initial revision
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parents:
diff changeset
   330
	srcskip += width-(width+7)/8;
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parents:
diff changeset
   331
	dstskip /= 4;
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parents:
diff changeset
   332
74212992fb08 Initial revision
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parents:
diff changeset
   333
	while ( height-- ) {
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parents:
diff changeset
   334
	        Uint8 byte = 0, bit;
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parents:
diff changeset
   335
	    	for ( c=0; c<width; ++c ) {
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   336
			if ( (c&7) == 0 ) {
0
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parents:
diff changeset
   337
				byte = *src++;
74212992fb08 Initial revision
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parents:
diff changeset
   338
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   339
			bit = (byte&0x80)>>7;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   340
			if ( bit != ckey ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   341
				*dstp=((Uint32 *)palmap)[bit];
74212992fb08 Initial revision
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parents:
diff changeset
   342
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   343
			byte <<= 1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   344
			dstp++;
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parents:
diff changeset
   345
		}
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parents:
diff changeset
   346
		src += srcskip;
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parents:
diff changeset
   347
		dstp += dstskip;
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parents:
diff changeset
   348
	}
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
}
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   350
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parents:
diff changeset
   351
static void BlitBtoNAlpha(SDL_BlitInfo *info)
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parents:
diff changeset
   352
{
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
        int width = info->d_width;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   354
	int height = info->d_height;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
	Uint8 *src = info->s_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
	Uint8 *dst = info->d_pixels;
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parents:
diff changeset
   357
	int srcskip = info->s_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
	int dstskip = info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
	const SDL_Color *srcpal	= info->src->palette->colors;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   360
	SDL_PixelFormat *dstfmt = info->dst;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
	int  dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
	int c;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
	const int A = info->src->alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
	/* Set up some basic variables */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   366
	dstbpp = dstfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
	srcskip += width-(width+7)/8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   368
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   369
	while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   370
	        Uint8 byte = 0, bit;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
	    	for ( c=0; c<width; ++c ) {
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   372
			if ( (c&7) == 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   373
				byte = *src++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   374
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   375
			bit = (byte&0x80)>>7;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   376
			if ( 1 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
			        Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   378
			        unsigned sR, sG, sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   379
				unsigned dR, dG, dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   380
				sR = srcpal[bit].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
				sG = srcpal[bit].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   382
				sB = srcpal[bit].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
							pixel, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   387
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   388
			byte <<= 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
			dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
		src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
		dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   396
static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
        int width = info->d_width;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
	int height = info->d_height;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
	Uint8 *src = info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
	Uint8 *dst = info->d_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
	int srcskip = info->s_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
	int dstskip = info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   404
	SDL_PixelFormat *srcfmt = info->src;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
	SDL_PixelFormat *dstfmt = info->dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
	const SDL_Color *srcpal	= srcfmt->palette->colors;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
	int dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
	int c;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
	const int A = srcfmt->alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
	Uint32 ckey = srcfmt->colorkey;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
	/* Set up some basic variables */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
	dstbpp = dstfmt->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
	srcskip += width-(width+7)/8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   416
	while ( height-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
	        Uint8  byte = 0, bit;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   418
	    	for ( c=0; c<width; ++c ) {
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   419
			if ( (c&7) == 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   420
				byte = *src++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
			bit = (byte&0x80)>>7;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
			if ( bit != ckey ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
			        int sR, sG, sB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
				int dR, dG, dB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
				Uint32 pixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
				sR = srcpal[bit].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
				sG = srcpal[bit].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
				sB = srcpal[bit].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   430
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
							pixel, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
			byte <<= 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
			dst += dstbpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
		src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
		dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   442
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
static SDL_loblit bitmap_blit[] = {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
	NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
};
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
static SDL_loblit colorkey_blit[] = {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
    NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   449
};
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   450
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   451
SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   452
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   453
	int which;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   454
1058
e6c91fd1911e Eh, more correct.
Sam Lantinga <slouken@libsdl.org>
parents: 1057
diff changeset
   455
	if ( surface->format->BitsPerPixel != 1 ) {
1057
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   456
		/* We don't support sub 8-bit packed pixel modes */
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   457
		return NULL;
e9d23bb80140 Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   458
	}
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   459
	if ( surface->map->dst->format->BitsPerPixel < 8 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   460
		which = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   461
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   462
		which = surface->map->dst->format->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   463
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   464
	switch(blit_index) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   465
	case 0:			/* copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   466
	    return bitmap_blit[which];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   467
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   468
	case 1:			/* colorkey */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   469
	    return colorkey_blit[which];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   470
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   471
	case 2:			/* alpha */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   472
	    return which >= 2 ? BlitBtoNAlpha : NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   473
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   474
	case 4:			/* alpha + colorkey */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   475
	    return which >= 2 ? BlitBtoNAlphaKey : NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   476
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   477
	return NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   478
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   479