harvey/sys/src/cmd/gs/src/zfdcte.c

/* Copyright (C) 1994, 2000 Aladdin Enterprises.  All rights reserved.
  
  This software is provided AS-IS with no warranty, either express or
  implied.
  
  This software is distributed under license and may not be copied,
  modified or distributed except as expressly authorized under the terms
  of the license contained in the file LICENSE in this distribution.
  
  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: zfdcte.c,v 1.8 2002/09/26 18:45:02 dan Exp $ */
/* 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"

/*#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_stable(imemory);
    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)
};