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hamx.c

/**
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 * hamx.c
 *
 * $Id: hamx.c,v 1.6 2003/04/27 09:59:36 ton Exp $
 */

#include "BLI_blenlib.h"

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef WIN32
#include "BLI_winstuff.h"
#include <io.h>
#endif


#include "imbuf.h"
#include "imbuf_patch.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"

#include "IMB_allocimbuf.h"
#include "IMB_filter.h"
#include "IMB_ham.h"
#include "IMB_hamx.h"

/* actually hard coded endianness */
#define GET_BIG_LONG(x) (((uchar *) (x))[0] << 24 | ((uchar *) (x))[1] << 16 | ((uchar *) (x))[2] << 8 | ((uchar *) (x))[3])
#define GET_LITTLE_LONG(x) (((uchar *) (x))[3] << 24 | ((uchar *) (x))[2] << 16 | ((uchar *) (x))[1] << 8 | ((uchar *) (x))[0])
#define SWAP_L(x) (((x << 24) & 0xff000000) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) | ((x >> 24) & 0xff))
#define SWAP_S(x) (((x << 8) & 0xff00) | ((x >> 8) & 0xff))

/* more endianness... should move to a separate file... */
#if defined(__sgi) || defined (__sparc) || defined (__sparc__) || defined (__PPC__) || defined (__ppc__) || defined (__BIG_ENDIAN__)
#define GET_ID GET_BIG_LONG
#define LITTLE_LONG SWAP_LONG
#else
#define GET_ID GET_LITTLE_LONG
#define LITTLE_LONG ENDIAN_NOP
#endif

#ifndef ABS
#define ABS(x)    ((x) < 0 ? -(x) : (x))
#endif

static uchar hamx_array_char[] = {
      0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF,
      0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF, 0x00,0x00,0xFF,0xFF,
      0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF,
      0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF, 0x00,0xFF,0x00,0xFF,
      0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00,
      0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00, 0x00,0xFF,0xFF,0x00,
      
      0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
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      0x00,0x00,0x00,0x00, 0x00,0x10,0x00,0x00, 0x00,0x20,0x00,0x00, 0x00,0x30,0x00,0x00, 0x00,0x40,0x00,0x00, 0x00,0x50,0x00,0x00, 0x00,0x60,0x00,0x00, 0x00,0x70,0x00,0x00,
      0x00,0x80,0x00,0x00, 0x00,0x90,0x00,0x00, 0x00,0xA0,0x00,0x00, 0x00,0xB0,0x00,0x00, 0x00,0xC0,0x00,0x00, 0x00,0xD0,0x00,0x00, 0x00,0xE0,0x00,0x00, 0x00,0xF0,0x00,0x00,
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      0x00,0xA0,0xB0,0x00, 0x00,0xA0,0xB0,0x30, 0x00,0xA0,0xB0,0x60, 0x00,0xA0,0xB0,0x90, 0x00,0xA0,0xB0,0xC0, 0x00,0xA0,0xB0,0xF0,
      0x00,0xA0,0xD0,0x00, 0x00,0xA0,0xD0,0x30, 0x00,0xA0,0xD0,0x60, 0x00,0xA0,0xD0,0x90, 0x00,0xA0,0xD0,0xC0, 0x00,0xA0,0xD0,0xF0,
      0x00,0xA0,0xF0,0x00, 0x00,0xA0,0xF0,0x30, 0x00,0xA0,0xF0,0x60, 0x00,0xA0,0xF0,0x90, 0x00,0xA0,0xF0,0xC0, 0x00,0xA0,0xF0,0xF0,
      0x00,0xF0,0x00,0x00, 0x00,0xF0,0x00,0x30, 0x00,0xF0,0x00,0x60, 0x00,0xF0,0x00,0x90, 0x00,0xF0,0x00,0xC0, 0x00,0xF0,0x00,0xF0,
      0x00,0xF0,0x20,0x00, 0x00,0xF0,0x20,0x30, 0x00,0xF0,0x20,0x60, 0x00,0xF0,0x20,0x90, 0x00,0xF0,0x20,0xC0, 0x00,0xF0,0x20,0xF0,
      0x00,0xF0,0x40,0x00, 0x00,0xF0,0x40,0x30, 0x00,0xF0,0x40,0x60, 0x00,0xF0,0x40,0x90, 0x00,0xF0,0x40,0xC0, 0x00,0xF0,0x40,0xF0,
      0x00,0xF0,0x60,0x00, 0x00,0xF0,0x60,0x30, 0x00,0xF0,0x60,0x60, 0x00,0xF0,0x60,0x90, 0x00,0xF0,0x60,0xC0, 0x00,0xF0,0x60,0xF0,
      0x00,0xF0,0x90,0x00, 0x00,0xF0,0x90,0x30, 0x00,0xF0,0x90,0x60, 0x00,0xF0,0x90,0x90, 0x00,0xF0,0x90,0xC0, 0x00,0xF0,0x90,0xF0,
      0x00,0xF0,0xB0,0x00, 0x00,0xF0,0xB0,0x30, 0x00,0xF0,0xB0,0x60, 0x00,0xF0,0xB0,0x90, 0x00,0xF0,0xB0,0xC0, 0x00,0xF0,0xB0,0xF0,
      0x00,0xF0,0xD0,0x00, 0x00,0xF0,0xD0,0x30, 0x00,0xF0,0xD0,0x60, 0x00,0xF0,0xD0,0x90, 0x00,0xF0,0xD0,0xC0, 0x00,0xF0,0xD0,0xF0,
      0x00,0xF0,0xF0,0x00, 0x00,0xF0,0xF0,0x30, 0x00,0xF0,0xF0,0x60, 0x00,0xF0,0xF0,0x90, 0x00,0xF0,0xF0,0xC0, 0x00,0xF0,0xF0,0xF0,
      
      0x00,0x10,0x10,0x10, 0x00,0x20,0x20,0x20, 0x00,0x30,0x30,0x30, 0x00,0x40,0x40,0x40,
      0x00,0x50,0x50,0x50, 0x00,0x60,0x60,0x60, 0x00,0x70,0x70,0x70, 0x00,0x80,0x80,0x80,
      0x00,0x90,0x90,0x90, 0x00,0xA0,0xA0,0xA0, 0x00,0xB0,0xB0,0xB0, 0x00,0xC0,0xC0,0xC0,
      0x00,0xD0,0xD0,0xD0, 0x00,0xE0,0xE0,0xE0
};

static int * hamx_array = (int *) (hamx_array_char);

static uchar cmap_hamx[] = {
      0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x30, 0x00,0x00,0x00,0x60, 0x00,0x00,0x00,0x90, 0x00,0x00,0x00,0xC0, 0x00,0x00,0x00,0xF0,
      0x00,0x00,0x20,0x00, 0x00,0x00,0x20,0x30, 0x00,0x00,0x20,0x60, 0x00,0x00,0x20,0x90, 0x00,0x00,0x20,0xC0, 0x00,0x00,0x20,0xF0,
      0x00,0x00,0x40,0x00, 0x00,0x00,0x40,0x30, 0x00,0x00,0x40,0x60, 0x00,0x00,0x40,0x90, 0x00,0x00,0x40,0xC0, 0x00,0x00,0x40,0xF0,
      0x00,0x00,0x60,0x00, 0x00,0x00,0x60,0x30, 0x00,0x00,0x60,0x60, 0x00,0x00,0x60,0x90, 0x00,0x00,0x60,0xC0, 0x00,0x00,0x60,0xF0,
      0x00,0x00,0x90,0x00, 0x00,0x00,0x90,0x30, 0x00,0x00,0x90,0x60, 0x00,0x00,0x90,0x90, 0x00,0x00,0x90,0xC0, 0x00,0x00,0x90,0xF0,
      0x00,0x00,0xB0,0x00, 0x00,0x00,0xB0,0x30, 0x00,0x00,0xB0,0x60, 0x00,0x00,0xB0,0x90, 0x00,0x00,0xB0,0xC0, 0x00,0x00,0xB0,0xF0,
      0x00,0x00,0xD0,0x00, 0x00,0x00,0xD0,0x30, 0x00,0x00,0xD0,0x60, 0x00,0x00,0xD0,0x90, 0x00,0x00,0xD0,0xC0, 0x00,0x00,0xD0,0xF0,
      0x00,0x00,0xF0,0x00, 0x00,0x00,0xF0,0x30, 0x00,0x00,0xF0,0x60, 0x00,0x00,0xF0,0x90, 0x00,0x00,0xF0,0xC0, 0x00,0x00,0xF0,0xF0,
      0x00,0x50,0x00,0x00, 0x00,0x50,0x00,0x30, 0x00,0x50,0x00,0x60, 0x00,0x50,0x00,0x90, 0x00,0x50,0x00,0xC0, 0x00,0x50,0x00,0xF0,
      0x00,0x50,0x20,0x00, 0x00,0x50,0x20,0x30, 0x00,0x50,0x20,0x60, 0x00,0x50,0x20,0x90, 0x00,0x50,0x20,0xC0, 0x00,0x50,0x20,0xF0,
      0x00,0x50,0x40,0x00, 0x00,0x50,0x40,0x30, 0x00,0x50,0x40,0x60, 0x00,0x50,0x40,0x90, 0x00,0x50,0x40,0xC0, 0x00,0x50,0x40,0xF0,
      0x00,0x50,0x60,0x00, 0x00,0x50,0x60,0x30, 0x00,0x50,0x60,0x60, 0x00,0x50,0x60,0x90, 0x00,0x50,0x60,0xC0, 0x00,0x50,0x60,0xF0,
      0x00,0x50,0x90,0x00, 0x00,0x50,0x90,0x30, 0x00,0x50,0x90,0x60, 0x00,0x50,0x90,0x90, 0x00,0x50,0x90,0xC0, 0x00,0x50,0x90,0xF0,
      0x00,0x50,0xB0,0x00, 0x00,0x50,0xB0,0x30, 0x00,0x50,0xB0,0x60, 0x00,0x50,0xB0,0x90, 0x00,0x50,0xB0,0xC0, 0x00,0x50,0xB0,0xF0,
      0x00,0x50,0xD0,0x00, 0x00,0x50,0xD0,0x30, 0x00,0x50,0xD0,0x60, 0x00,0x50,0xD0,0x90, 0x00,0x50,0xD0,0xC0, 0x00,0x50,0xD0,0xF0,
      0x00,0x50,0xF0,0x00, 0x00,0x50,0xF0,0x30, 0x00,0x50,0xF0,0x60, 0x00,0x50,0xF0,0x90, 0x00,0x50,0xF0,0xC0, 0x00,0x50,0xF0,0xF0,
      0x00,0xA0,0x00,0x00, 0x00,0xA0,0x00,0x30, 0x00,0xA0,0x00,0x60, 0x00,0xA0,0x00,0x90, 0x00,0xA0,0x00,0xC0, 0x00,0xA0,0x00,0xF0,
      0x00,0xA0,0x20,0x00, 0x00,0xA0,0x20,0x30, 0x00,0xA0,0x20,0x60, 0x00,0xA0,0x20,0x90, 0x00,0xA0,0x20,0xC0, 0x00,0xA0,0x20,0xF0,
      0x00,0xA0,0x40,0x00, 0x00,0xA0,0x40,0x30, 0x00,0xA0,0x40,0x60, 0x00,0xA0,0x40,0x90, 0x00,0xA0,0x40,0xC0, 0x00,0xA0,0x40,0xF0,
      0x00,0xA0,0x60,0x00, 0x00,0xA0,0x60,0x30, 0x00,0xA0,0x60,0x60, 0x00,0xA0,0x60,0x90, 0x00,0xA0,0x60,0xC0, 0x00,0xA0,0x60,0xF0,
      0x00,0xA0,0x90,0x00, 0x00,0xA0,0x90,0x30, 0x00,0xA0,0x90,0x60, 0x00,0xA0,0x90,0x90, 0x00,0xA0,0x90,0xC0, 0x00,0xA0,0x90,0xF0,
      0x00,0xA0,0xB0,0x00, 0x00,0xA0,0xB0,0x30, 0x00,0xA0,0xB0,0x60, 0x00,0xA0,0xB0,0x90, 0x00,0xA0,0xB0,0xC0, 0x00,0xA0,0xB0,0xF0,
      0x00,0xA0,0xD0,0x00, 0x00,0xA0,0xD0,0x30, 0x00,0xA0,0xD0,0x60, 0x00,0xA0,0xD0,0x90, 0x00,0xA0,0xD0,0xC0, 0x00,0xA0,0xD0,0xF0,
      0x00,0xA0,0xF0,0x00, 0x00,0xA0,0xF0,0x30, 0x00,0xA0,0xF0,0x60, 0x00,0xA0,0xF0,0x90, 0x00,0xA0,0xF0,0xC0, 0x00,0xA0,0xF0,0xF0,
      0x00,0xF0,0x00,0x00, 0x00,0xF0,0x00,0x30, 0x00,0xF0,0x00,0x60, 0x00,0xF0,0x00,0x90, 0x00,0xF0,0x00,0xC0, 0x00,0xF0,0x00,0xF0,
      0x00,0xF0,0x20,0x00, 0x00,0xF0,0x20,0x30, 0x00,0xF0,0x20,0x60, 0x00,0xF0,0x20,0x90, 0x00,0xF0,0x20,0xC0, 0x00,0xF0,0x20,0xF0,
      0x00,0xF0,0x40,0x00, 0x00,0xF0,0x40,0x30, 0x00,0xF0,0x40,0x60, 0x00,0xF0,0x40,0x90, 0x00,0xF0,0x40,0xC0, 0x00,0xF0,0x40,0xF0,
      0x00,0xF0,0x60,0x00, 0x00,0xF0,0x60,0x30, 0x00,0xF0,0x60,0x60, 0x00,0xF0,0x60,0x90, 0x00,0xF0,0x60,0xC0, 0x00,0xF0,0x60,0xF0,
      0x00,0xF0,0x90,0x00, 0x00,0xF0,0x90,0x30, 0x00,0xF0,0x90,0x60, 0x00,0xF0,0x90,0x90, 0x00,0xF0,0x90,0xC0, 0x00,0xF0,0x90,0xF0,
      0x00,0xF0,0xB0,0x00, 0x00,0xF0,0xB0,0x30, 0x00,0xF0,0xB0,0x60, 0x00,0xF0,0xB0,0x90, 0x00,0xF0,0xB0,0xC0, 0x00,0xF0,0xB0,0xF0,
      0x00,0xF0,0xD0,0x00, 0x00,0xF0,0xD0,0x30, 0x00,0xF0,0xD0,0x60, 0x00,0xF0,0xD0,0x90, 0x00,0xF0,0xD0,0xC0, 0x00,0xF0,0xD0,0xF0,
      0x00,0xF0,0xF0,0x00, 0x00,0xF0,0xF0,0x30, 0x00,0xF0,0xF0,0x60, 0x00,0xF0,0xF0,0x90, 0x00,0xF0,0xF0,0xC0, 0x00,0xF0,0xF0,0xF0,
      0x00,0x10,0x10,0x10, 0x00,0x20,0x20,0x20, 0x00,0x30,0x30,0x30, 0x00,0x40,0x40,0x40, 0x00,0x50,0x50,0x50, 0x00,0x60,0x60,0x60,
      0x00,0x70,0x70,0x70, 0x00,0x80,0x80,0x80, 0x00,0x90,0x90,0x90, 0x00,0xA0,0xA0,0xA0, 0x00,0xB0,0xB0,0xB0, 0x00,0xC0,0xC0,0xC0,
      0x00,0xD0,0xD0,0xD0, 0x00,0xE0,0xE0,0xE0
};


float adat_gamma = 1.0;
float adat_distort = 1.0;

/*
 * 
 * New version:
 * 
 * 32 brighntesses      Y                  15 with direct access (black and white are specials)
 * 16 colors            H ue        
 * 7 intensities  S aturation
 * 
 * Total 3584 'different' colors. First 512 colors free.
 * 
 * 
 */

void imb_convhamx(struct ImBuf *ibuf, unsigned char coltab[][4], short *deltab)
{
      short r,g,b,lr,lg,lb,dr,dg,db,col,fout,type,step;
      int i;
      uchar *rect;

      /*
            b     = 0000 xxxx
            g     = 0001 xxxx
            r     = 0010 xxxx
            cmap  >=  48
      */

      for (step = 0 ; step < 2 ; step ++){
            rect =  (uchar *) ibuf->rect;
            rect += 4*step;
            i = ((ibuf->x * ibuf->y) + 2 - step - 1) / 2;

            lb = coltab[0][1];
            lg = coltab[0][2];
            lr = coltab[0][3];
            type = col = 0;

            for ( ;i>0;i--){
                  b = rect[2] >> 4;
                  g = rect[1] >> 4;
                  r = rect[0] >> 4;

                  if ((b-lb) | (g-lg) | (r-lr)){
                        col = ((b<<8) + (g<<4) + r) << 1;
                        fout = deltab[col + 1];
                        col = deltab[col];
                        type = 0;
                        dr = quadr[lr-r] ;
                        dg = quadr[lg-g] ;
                        db = quadr[lb-b];

                        if ((dr+dg)<=fout) {
                              fout = dr+dg ;
                              type = 1;
                        }
                        if ((dg+db)<=fout) {
                              fout = dg+db;
                              type = 2;
                        }
                        if ((dr+db)<=fout) {
                              fout = dr+db;
                              type = 4;
                        }

                        switch(type){
                        case 1:
                              lb = b ;
                              col = b;
                              break;
                        case 4:
                              lg = g ;
                              col = g+16;
                              break;
                        case 2:
                              lr = r ;
                              col = r + 32;
                              break;
                        default:
                              /*printf("%04x %5d %5d  ", (b<<8) + (g<<4) + r, col, fout);*/
                              
                              lb = coltab[col][1];
                              lg = coltab[col][2];
                              lr = coltab[col][3];
                              /*printf("%01x%01x%01x %01x%01x%01x\n", b, g, r, lb, lg, lr);*/
                              col += 48;
                        }
                  }
                  rect[3] = col;
                  rect += 8;
            }
      }
}

static short dec_hamx(struct ImBuf * ibuf, unsigned char *body, int cmap[])
{
      int todo,i;
      int j,step,col;
      unsigned int *rect;

      for (step = 0 ; step < 2 ; step ++){
            rect = ibuf->rect;
            rect += step;
            todo = (ibuf->x * ibuf->y + 2 - step - 1) / 2;
            col = cmap[0];
            while (todo>0){
                  i = *body++;

                  if (i & 128){                 /* fill */

                        i = 257-i;
                        todo -= i;
                        j = *(body++);

                        col = ((col & hamx_array[j]) | hamx_array[j + 256]);

                        do{
                              *rect = col;
                              rect += 2;
                        }while (--i);
                  } else{                       /* copy */
                        i++;
                        todo-=i;

                        do{
                              j = *(body++);
                              *rect = col = ((col & hamx_array[j]) | hamx_array[j + 256]);
                              rect += 2;
                        }while (--i);
                  }
            }
            if (todo) return (0);
      }
      return(1);
}


struct ImBuf *imb_loadanim(int *iffmem, int flags)
{
      int chunk, totlen, len, *mem, cmaplen = 0;
      unsigned int *cmap;
      uchar *body = 0;
      struct Adat adat;
      struct ImBuf *ibuf=0;
      static int is_flipped = FALSE;
      
      mem=iffmem;
      if (GET_ID(mem) != FORM) return (0);
      if (GET_ID(mem + 2) != ANIM) return (0);
      totlen= (GET_BIG_LONG(mem + 1) + 1) & ~1;
      mem += 3;
      totlen -= 4;
      adat.w = 0;
      adat.xorig = 0;
      adat.yorig = 0;
      adat.gamma = adat_gamma;
      adat.distort = adat_distort;
      
      while(totlen > 0){
            chunk = GET_ID(mem);
            len = (GET_BIG_LONG(mem + 1) + 1) & ~1;
            mem += 2;

            totlen -= len+8;
            switch (chunk){
            case ADAT:
                  if (len > sizeof(struct Adat)){
                        memcpy(&adat,mem,sizeof(struct Adat));
                  } else{
                        memcpy(&adat,mem,len);
                  }
                  adat.w = BIG_SHORT(adat.w);
                  adat.h = BIG_SHORT(adat.h);
                  adat.type = BIG_SHORT(adat.type);
                  adat.xorig = BIG_SHORT(adat.xorig);
                  adat.yorig = BIG_SHORT(adat.yorig);
                  break;
            case CMAP:
                  cmap = (unsigned int *) mem;
                  cmaplen = len;
                  break;
            case BODY:
                  body = (uchar *) mem;
                  break;
            }
            mem = (int *)((uchar *)mem +len);
      }

      if (body == 0) return (0);
      if (adat.w == 0) return (0);

      adat_gamma = adat.gamma;
      adat_distort = adat.distort;

      if (flags & IB_test) ibuf=IMB_allocImBuf(adat.w, adat.h, 24, 0, 0);
      else ibuf=IMB_allocImBuf(adat.w, adat.h, 24, IB_rect, 0);
      if (ibuf==0) return (0);

      ibuf->ftype = (Anim | adat.type);
      ibuf->xorig = adat.xorig;
      ibuf->yorig = adat.yorig;
      ibuf->flags = flags;
      
      if (cmaplen){
            ibuf->cmap = malloc(cmaplen);
            memcpy(ibuf->cmap, cmap, cmaplen);
            ibuf->maxcol = cmaplen >> 2;
      }

      if (flags & IB_test){
            if (flags & IB_freem) free(iffmem);
            return(ibuf);
      }

      switch (adat.type){
      case HAMX:
            if (flags & IB_rect){
                  if (!is_flipped) {
                        int i;
                        unsigned int * t;
                        t = (unsigned int *) hamx_array_char;
                        for (i = 0; i < sizeof(hamx_array_char) / sizeof(int) ; i++) {
                              t[i] = SWAP_LONG(t[i]);
                        }
                        
                        t = (unsigned int *) cmap_hamx;
                  
                        for (i = 0; i < sizeof(cmap_hamx) / sizeof(int) ; i++) {
                              t[i] = SWAP_LONG(t[i]);
                        }
                        
                        is_flipped= TRUE;
                  }

                  if (dec_hamx(ibuf,body,(int*) cmap_hamx) == 0){
                        IMB_freeImBuf(ibuf);
                        ibuf = 0;
                  }
                  if (flags & IB_ttob) IMB_flipy(ibuf);
            }
            break;
      default:
            IMB_freeImBuf(ibuf);
            ibuf = 0;
      }
      
      if (flags & IB_freem) free(iffmem);

      return (ibuf);
}


static unsigned char *makebody_anim(int bytes,
                                           unsigned char *buf,
                                           unsigned char *rect)
{
      register uchar last,this;
      register int copy;
      register uchar *rectstart,*temp;

      bytes--;
      rectstart = rect;
      last = *rect++;
      this = *rect++;
      copy = last^this;
      while (bytes>0){
            if (copy){
                  do{
                        last = this;
                        this = *rect++;
                        if (last == this){
                              if (this == rect[-3]){        /* three the same? */
                                    bytes --;                           /* init bytes */
                                    break;
                              }
                        }
                  }while (--bytes != 0);

                  copy = rect-rectstart;
                  copy --;
                  if (bytes) copy -= 2;

                  temp = rect;
                  rect = rectstart;

                  while (copy){
                        last = copy;
                        if (copy>MAXDAT) last = MAXDAT;
                        copy -= last;
                        *buf++ = last-1;
                        do{
                              *buf++ = *rect++;
                        }while(--last != 0);
                  }
                  rectstart = rect;
                  rect = temp;
                  last = this;

                  copy = FALSE;
            } else {
                  while (*rect++ == this){            /* seek first different byte */
                        if (--bytes == 0) break;      /* or end of line */
                  }
                  rect --;
                  copy = rect-rectstart;
                  rectstart = rect;
                  bytes --;
                  this = *rect++;

                  while (copy){
                        if (copy>MAXRUN){
                              *buf++ = -(MAXRUN-1);
                              *buf++ = last;
                              copy -= MAXRUN;
                        } else {
                              *buf++ = -(copy-1);
                              *buf++ = last;
                              break;
                        }
                  }
                  copy=TRUE;
            }
      }
      return (buf);
}


short imb_enc_anim(struct ImBuf *ibuf, int file)
{
      int step, size, i, skip, steps = 0;
      uchar *buf1, *crect, *_buf1, *_buf2, *bufend;
      short ok = TRUE;

      if (ibuf == 0) return (0);
      if (file < 0 ) return (0);
      if (ibuf->rect == 0) return(0);

      /* add dither */

      switch(ibuf->ftype){
      case AN_hamx:
            ibuf->cmap = (unsigned int *) cmap_hamx;
            ibuf->mincol = 0;
            ibuf->maxcol = sizeof(cmap_hamx) / 4;
            imb_converttoham(ibuf);
            steps = 2;
            break;
      }
        if (steps == 0) return 0;

      size = ((ibuf->x + 1)* (ibuf->y + 1)) / steps + 1024;
      if ((_buf1  = malloc(size)) == 0) return(0);
      if ((_buf2  = malloc(size)) == 0){
            free(_buf1);
            return(0);
      }

      skip = 4 * steps;
      for (step = 0 ; step < steps ; step ++){
            crect = (uchar *) ibuf->rect;
            crect += 4 * step;
            size = (ibuf->x * ibuf->y + steps - step - 1) / steps;
            buf1 = _buf1;
            if ((ibuf->ftype == AN_hamx) || (ibuf->ftype == AN_yuvx)){
                  crect += 3;
                  for (i = size ; i>0 ; i--){
                        *(buf1 ++) = *crect;
                        crect += skip;
                  }
            } else{
                  for (i = size ; i>0 ; i--){
                        *(buf1 ++) = crect[1] + (crect[2] >> 2) + (crect[3] >> 5);
                        crect += skip;
                  }
            }
            bufend = makebody_anim(size,_buf2,_buf1);
            if (bufend == 0){
                  ok = FALSE;
                  break;
            }
            size = bufend - _buf2;
            if (write(file, _buf2, size) != size){
                  ok = FALSE;
                  break;
            }
      }
      free(_buf1);
      free(_buf2);
      return (ok);
}

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