Kent Mein
d0e346d544
#ifdef HAVE_CONFIG_H #include <config.h> #endif Just need to finish cpp files now :) Kent -- mein@cs.umn.edu
138 lines
2.6 KiB
C
138 lines
2.6 KiB
C
/**
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*
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* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version. The Blender
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* Foundation also sells licenses for use in proprietary software under
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* the Blender License. See http://www.blender.org/BL/ for information
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* about this.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL/BL DUAL LICENSE BLOCK *****
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* dither.c
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*
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* $Id$
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*/
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#include "BLI_blenlib.h"
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#include "imbuf.h"
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#include "imbuf_patch.h"
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#include "IMB_imbuf_types.h"
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#include "IMB_imbuf.h"
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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void IMB_dit0(struct ImBuf * ibuf, short ofs, short bits)
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{
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int x, y, and, add, pix;
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uchar *rect;
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rect= (uchar *)ibuf->rect;
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rect +=ofs;
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bits = 8 - bits;
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and = ~((1 << bits)-1);
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add = 1 << (bits - 1);
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for (y = ibuf->y; y > 0; y--){
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for (x = ibuf->x; x > 0; x--) {
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pix = *rect + add;
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if (pix > 255) pix = 255;
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*rect = pix & and;
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rect += 4;
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}
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}
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}
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void IMB_dit2(struct ImBuf * ibuf, short ofs, short bits)
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{
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short x,y,pix,and,add1,add2;
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uchar *rect;
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uchar dit[4];
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rect= (uchar *)ibuf->rect;
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rect +=ofs;
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bits = 8 - bits;
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and = ~((1<<bits)-1);
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bits -= 2;
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ofs = 0;
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switch(ofs){
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case 3:
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break;
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case 2:
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dit[0]=0;
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dit[1]=1;
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dit[2]=2;
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dit[3]=3;
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break;
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case 1:
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dit[0]=3;
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dit[1]=1;
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dit[2]=0;
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dit[3]=2;
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break;
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case 0:
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dit[0]=0;
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dit[1]=2;
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dit[2]=3;
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dit[3]=1;
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break;
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}
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if (bits < 0){
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dit[0] >>= -bits;
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dit[1] >>= -bits;
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dit[2] >>= -bits;
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dit[3] >>= -bits;
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} else{
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dit[0] <<= bits;
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dit[1] <<= bits;
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dit[2] <<= bits;
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dit[3] <<= bits;
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}
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for(y=ibuf->y;y>0;y--){
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if(y & 1){
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add1=dit[0];
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add2=dit[1];
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}
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else{
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add1=dit[2];
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add2=dit[3];
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}
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for(x=ibuf->x;x>0;x--){
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pix = *rect;
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if (x & 1) pix += add1;
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else pix += add2;
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if (pix>255) pix=255;
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*rect = pix & and;
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rect += 4;
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}
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}
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}
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