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

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*/

/*$Id: zfdcte.c,v 1.5 2001/05/30 17:38:45 rayjj 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_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)
};