/* Copyright (C) 1994 Aladdin Enterprises.  All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License version 2
  as published by the Free Software Foundation.


  This software is provided AS-IS with no warranty, either express or
  implied. That is, 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.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: sjpeg.h,v 1.5 2002/06/16 05:00:54 lpd Exp $ */
/* IJG entry point wrappers */
/* Requires sdct.h, jpeg/jpeglib.h */

#ifndef sjpeg_INCLUDED
#  define sjpeg_INCLUDED

/*
 * Each routine gs_jpeg_xxx is equivalent to the IJG entry point jpeg_xxx,
 * except that
 *   (a) it takes a pointer to stream_DCT_state instead of just the IJG
 *       jpeg_(de)compress_data struct;
 *   (b) it catches any error exit from the IJG code and converts it into
 *       an error return value per Ghostscript custom.  A negative return
 *       value is an error code, except for gs_jpeg_alloc_xxx which return
 *       NULL (indicating e_VMerror).
 */

/* Common to encode/decode */

void gs_jpeg_error_setup(stream_DCT_state * st);
int gs_jpeg_log_error(stream_DCT_state * st);
JQUANT_TBL *gs_jpeg_alloc_quant_table(stream_DCT_state * st);
JHUFF_TBL *gs_jpeg_alloc_huff_table(stream_DCT_state * st);
int gs_jpeg_destroy(stream_DCT_state * st);

/* Encode */

int gs_jpeg_create_compress(stream_DCT_state * st);
int gs_jpeg_set_defaults(stream_DCT_state * st);
int gs_jpeg_set_colorspace(stream_DCT_state * st,
			   J_COLOR_SPACE colorspace);
int gs_jpeg_set_linear_quality(stream_DCT_state * st,
			       int scale_factor, boolean force_baseline);
int gs_jpeg_set_quality(stream_DCT_state * st,
			int quality, boolean force_baseline);
int gs_jpeg_start_compress(stream_DCT_state * st,
			   boolean write_all_tables);
int gs_jpeg_write_scanlines(stream_DCT_state * st,
			    JSAMPARRAY scanlines, int num_lines);
int gs_jpeg_finish_compress(stream_DCT_state * st);

/* Decode */

int gs_jpeg_create_decompress(stream_DCT_state * st);
int gs_jpeg_read_header(stream_DCT_state * st,
			boolean require_image);
int gs_jpeg_start_decompress(stream_DCT_state * st);
int gs_jpeg_read_scanlines(stream_DCT_state * st,
			   JSAMPARRAY scanlines, int max_lines);
int gs_jpeg_finish_decompress(stream_DCT_state * st);

#endif /* sjpeg_INCLUDED */
