/* Copyright (C) 1994, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: zfdcte.c,v $ $Revision: 1.3.2.2 $ */
/* DCTEncode filter creation */
#include "memory_.h"
#include "stdio_.h"		/* for jpeglib.h */
#include "jpeglib_.h"
#include "ghost.h"
#include "oper.h"
#include "gsmalloc.h"		/* for gs_memory_default */
#include "ialloc.h"
#include "idict.h"
#include "idparam.h"
#include "strimpl.h"
#include "sdct.h"
#include "sjpeg.h"
#include "ifilter.h"
#include "iparam.h"

public_st_jpeg_compress_data();

/*#define TEST*/
/* Import the parameter processing procedure from sdeparam.c */
stream_state_proc_put_params(s_DCTE_put_params, stream_DCT_state);
#ifdef TEST
stream_state_proc_get_params(s_DCTE_get_params, stream_DCT_state);
#endif

/* <target> <dict> DCTEncode/filter <file> */
private int
zDCTE(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_memory_t *mem = &gs_memory_default;
    stream_DCT_state state;
    dict_param_list list;
    jpeg_compress_data *jcdp;
    int code;
    const ref *dop;
    uint dspace;

    /* First allocate space for IJG parameters. */
    jcdp = gs_alloc_struct_immovable(mem, jpeg_compress_data,
      &st_jpeg_compress_data, "zDCTE");
    if (jcdp == 0)
	return_error(e_VMerror);
    if (s_DCTE_template.set_defaults)
	(*s_DCTE_template.set_defaults) ((stream_state *) & state);
    state.data.compress = jcdp;
    jcdp->memory = state.jpeg_memory = mem;	/* set now for allocation */
    state.report_error = filter_report_error;	/* in case create fails */
    if ((code = gs_jpeg_create_compress(&state)) < 0)
	goto fail;		/* correct to do jpeg_destroy here */
    /* Read parameters from dictionary */
    if (r_has_type(op, t_dictionary))
	dop = op, dspace = r_space(op);
    else
	dop = 0, dspace = 0;
    if ((code = dict_param_list_read(&list, dop, NULL, false, iimemory)) < 0)
	goto fail;
    if ((code = s_DCTE_put_params((gs_param_list *) & list, &state)) < 0)
	goto rel;
    /* Create the filter. */
    jcdp->template = s_DCTE_template;
    /* Make sure we get at least a full scan line of input. */
    state.scan_line_size = jcdp->cinfo.input_components *
	jcdp->cinfo.image_width;
    jcdp->template.min_in_size =
	max(s_DCTE_template.min_in_size, state.scan_line_size);
    /* Make sure we can write the user markers in a single go. */
    jcdp->template.min_out_size =
	max(s_DCTE_template.min_out_size, state.Markers.size);
    code = filter_write(i_ctx_p, 0, &jcdp->template,
			(stream_state *) & state, dspace);
    if (code >= 0)		/* Success! */
	return code;
    /* We assume that if filter_write fails, the stream has not been
     * registered for closing, so s_DCTE_release will never be called.
     * Therefore we free the allocated memory before failing.
     */
rel:
    iparam_list_release(&list);
fail:
    gs_jpeg_destroy(&state);
    gs_free_object(mem, jcdp, "zDCTE fail");
    return code;
}

#ifdef TEST
#include "stream.h"
#include "files.h"
/* <dict> <filter> <bool> .dcteparams <dict> */
private int
zdcteparams(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    stream *s;
    dict_param_list list;
    int code;

    check_type(*op, t_boolean);
    check_write_file(s, op - 1);
    check_type(op[-2], t_dictionary);
    /* The DCT filters copy the template.... */
    if (s->state->template->process != s_DCTE_template.process)
	return_error(e_rangecheck);
    code = dict_param_list_write(&list, op - 2, NULL, iimemory);
    if (code < 0)
	return code;
    code = s_DCTE_get_params((gs_param_list *) & list,
			     (stream_DCT_state *) s->state,
			     op->value.boolval);
    iparam_list_release(&list);
    if (code >= 0)
	pop(2);
    return code;
}
#endif

/* ------ Initialization procedure ------ */

const op_def zfdcte_op_defs[] =
{
#ifdef TEST
    {"3.dcteparams", zdcteparams},
#endif
    op_def_begin_filter(),
    {"2DCTEncode", zDCTE},
    op_def_end(0)
};
