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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 ) {
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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 ) {
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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 ) {
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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 ) {
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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 ) {
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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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memcpy(dst, &palmap[bit*4], 3);
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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 BlitBto4Key(SDL_BlitInfo *info)
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{
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319 |
int width = info->d_width;
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320 |
int height = info->d_height;
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slouken@0
|
321 |
Uint8 *src = info->s_pixels;
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slouken@0
|
322 |
Uint32 *dstp = (Uint32 *)info->d_pixels;
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slouken@0
|
323 |
int srcskip = info->s_skip;
|
slouken@0
|
324 |
int dstskip = info->d_skip;
|
slouken@0
|
325 |
Uint32 ckey = info->src->colorkey;
|
slouken@0
|
326 |
Uint8 *palmap = info->table;
|
slouken@0
|
327 |
int c;
|
slouken@0
|
328 |
|
slouken@0
|
329 |
/* Set up some basic variables */
|
slouken@0
|
330 |
srcskip += width-(width+7)/8;
|
slouken@0
|
331 |
dstskip /= 4;
|
slouken@0
|
332 |
|
slouken@0
|
333 |
while ( height-- ) {
|
slouken@0
|
334 |
Uint8 byte = 0, bit;
|
slouken@0
|
335 |
for ( c=0; c<width; ++c ) {
|
slouken@91
|
336 |
if ( (c&7) == 0 ) {
|
slouken@0
|
337 |
byte = *src++;
|
slouken@0
|
338 |
}
|
slouken@0
|
339 |
bit = (byte&0x80)>>7;
|
slouken@0
|
340 |
if ( bit != ckey ) {
|
slouken@0
|
341 |
*dstp=((Uint32 *)palmap)[bit];
|
slouken@0
|
342 |
}
|
slouken@0
|
343 |
byte <<= 1;
|
slouken@0
|
344 |
dstp++;
|
slouken@0
|
345 |
}
|
slouken@0
|
346 |
src += srcskip;
|
slouken@0
|
347 |
dstp += dstskip;
|
slouken@0
|
348 |
}
|
slouken@0
|
349 |
}
|
slouken@0
|
350 |
|
slouken@0
|
351 |
static void BlitBtoNAlpha(SDL_BlitInfo *info)
|
slouken@0
|
352 |
{
|
slouken@0
|
353 |
int width = info->d_width;
|
slouken@0
|
354 |
int height = info->d_height;
|
slouken@0
|
355 |
Uint8 *src = info->s_pixels;
|
slouken@0
|
356 |
Uint8 *dst = info->d_pixels;
|
slouken@0
|
357 |
int srcskip = info->s_skip;
|
slouken@0
|
358 |
int dstskip = info->d_skip;
|
slouken@0
|
359 |
const SDL_Color *srcpal = info->src->palette->colors;
|
slouken@0
|
360 |
SDL_PixelFormat *dstfmt = info->dst;
|
slouken@0
|
361 |
int dstbpp;
|
slouken@0
|
362 |
int c;
|
slouken@0
|
363 |
const int A = info->src->alpha;
|
slouken@0
|
364 |
|
slouken@0
|
365 |
/* Set up some basic variables */
|
slouken@0
|
366 |
dstbpp = dstfmt->BytesPerPixel;
|
slouken@0
|
367 |
srcskip += width-(width+7)/8;
|
slouken@0
|
368 |
|
slouken@0
|
369 |
while ( height-- ) {
|
slouken@0
|
370 |
Uint8 byte = 0, bit;
|
slouken@0
|
371 |
for ( c=0; c<width; ++c ) {
|
slouken@91
|
372 |
if ( (c&7) == 0 ) {
|
slouken@0
|
373 |
byte = *src++;
|
slouken@0
|
374 |
}
|
slouken@0
|
375 |
bit = (byte&0x80)>>7;
|
slouken@0
|
376 |
if ( 1 ) {
|
slouken@0
|
377 |
Uint32 pixel;
|
slouken@0
|
378 |
unsigned sR, sG, sB;
|
slouken@0
|
379 |
unsigned dR, dG, dB;
|
slouken@0
|
380 |
sR = srcpal[bit].r;
|
slouken@0
|
381 |
sG = srcpal[bit].g;
|
slouken@0
|
382 |
sB = srcpal[bit].b;
|
slouken@0
|
383 |
DISEMBLE_RGB(dst, dstbpp, dstfmt,
|
slouken@0
|
384 |
pixel, dR, dG, dB);
|
slouken@0
|
385 |
ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
|
slouken@0
|
386 |
ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
|
slouken@0
|
387 |
}
|
slouken@0
|
388 |
byte <<= 1;
|
slouken@0
|
389 |
dst += dstbpp;
|
slouken@0
|
390 |
}
|
slouken@0
|
391 |
src += srcskip;
|
slouken@0
|
392 |
dst += dstskip;
|
slouken@0
|
393 |
}
|
slouken@0
|
394 |
}
|
slouken@0
|
395 |
|
slouken@0
|
396 |
static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
|
slouken@0
|
397 |
{
|
slouken@0
|
398 |
int width = info->d_width;
|
slouken@0
|
399 |
int height = info->d_height;
|
slouken@0
|
400 |
Uint8 *src = info->s_pixels;
|
slouken@0
|
401 |
Uint8 *dst = info->d_pixels;
|
slouken@0
|
402 |
int srcskip = info->s_skip;
|
slouken@0
|
403 |
int dstskip = info->d_skip;
|
slouken@0
|
404 |
SDL_PixelFormat *srcfmt = info->src;
|
slouken@0
|
405 |
SDL_PixelFormat *dstfmt = info->dst;
|
slouken@0
|
406 |
const SDL_Color *srcpal = srcfmt->palette->colors;
|
slouken@0
|
407 |
int dstbpp;
|
slouken@0
|
408 |
int c;
|
slouken@0
|
409 |
const int A = srcfmt->alpha;
|
slouken@0
|
410 |
Uint32 ckey = srcfmt->colorkey;
|
slouken@0
|
411 |
|
slouken@0
|
412 |
/* Set up some basic variables */
|
slouken@0
|
413 |
dstbpp = dstfmt->BytesPerPixel;
|
slouken@0
|
414 |
srcskip += width-(width+7)/8;
|
slouken@0
|
415 |
|
slouken@0
|
416 |
while ( height-- ) {
|
slouken@0
|
417 |
Uint8 byte = 0, bit;
|
slouken@0
|
418 |
for ( c=0; c<width; ++c ) {
|
slouken@91
|
419 |
if ( (c&7) == 0 ) {
|
slouken@0
|
420 |
byte = *src++;
|
slouken@0
|
421 |
}
|
slouken@0
|
422 |
bit = (byte&0x80)>>7;
|
slouken@0
|
423 |
if ( bit != ckey ) {
|
slouken@0
|
424 |
int sR, sG, sB;
|
slouken@0
|
425 |
int dR, dG, dB;
|
slouken@0
|
426 |
Uint32 pixel;
|
slouken@0
|
427 |
sR = srcpal[bit].r;
|
slouken@0
|
428 |
sG = srcpal[bit].g;
|
slouken@0
|
429 |
sB = srcpal[bit].b;
|
slouken@0
|
430 |
DISEMBLE_RGB(dst, dstbpp, dstfmt,
|
slouken@0
|
431 |
pixel, dR, dG, dB);
|
slouken@0
|
432 |
ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
|
slouken@0
|
433 |
ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
|
slouken@0
|
434 |
}
|
slouken@0
|
435 |
byte <<= 1;
|
slouken@0
|
436 |
dst += dstbpp;
|
slouken@0
|
437 |
}
|
slouken@0
|
438 |
src += srcskip;
|
slouken@0
|
439 |
dst += dstskip;
|
slouken@0
|
440 |
}
|
slouken@0
|
441 |
}
|
slouken@0
|
442 |
|
slouken@0
|
443 |
static SDL_loblit bitmap_blit[] = {
|
slouken@0
|
444 |
NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
|
slouken@0
|
445 |
};
|
slouken@0
|
446 |
|
slouken@0
|
447 |
static SDL_loblit colorkey_blit[] = {
|
slouken@0
|
448 |
NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
|
slouken@0
|
449 |
};
|
slouken@0
|
450 |
|
slouken@0
|
451 |
SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
|
slouken@0
|
452 |
{
|
slouken@0
|
453 |
int which;
|
slouken@0
|
454 |
|
slouken@1058
|
455 |
if ( surface->format->BitsPerPixel != 1 ) {
|
slouken@1057
|
456 |
/* We don't support sub 8-bit packed pixel modes */
|
slouken@1057
|
457 |
return NULL;
|
slouken@1057
|
458 |
}
|
slouken@0
|
459 |
if ( surface->map->dst->format->BitsPerPixel < 8 ) {
|
slouken@0
|
460 |
which = 0;
|
slouken@0
|
461 |
} else {
|
slouken@0
|
462 |
which = surface->map->dst->format->BytesPerPixel;
|
slouken@0
|
463 |
}
|
slouken@0
|
464 |
switch(blit_index) {
|
slouken@0
|
465 |
case 0: /* copy */
|
slouken@0
|
466 |
return bitmap_blit[which];
|
slouken@0
|
467 |
|
slouken@0
|
468 |
case 1: /* colorkey */
|
slouken@0
|
469 |
return colorkey_blit[which];
|
slouken@0
|
470 |
|
slouken@0
|
471 |
case 2: /* alpha */
|
slouken@0
|
472 |
return which >= 2 ? BlitBtoNAlpha : NULL;
|
slouken@0
|
473 |
|
slouken@0
|
474 |
case 4: /* alpha + colorkey */
|
slouken@0
|
475 |
return which >= 2 ? BlitBtoNAlphaKey : NULL;
|
slouken@0
|
476 |
}
|
slouken@0
|
477 |
return NULL;
|
slouken@0
|
478 |
}
|
slouken@0
|
479 |
|