xref: /plan9/sys/src/cmd/gs/src/zfont2.c (revision 593dc095aefb2a85c828727bbfa9da139a49bdf4)

/* Copyright (C) 1991, 1995, 1996, 1997, 1998, 1999 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: zfont2.c,v 1.7 2004/08/04 19:36:13 stefan Exp $ */
/* Type 2 font creation operators */
#include "ghost.h"
#include "oper.h"
#include "gxfixed.h"
#include "gsmatrix.h"
#include "gxfont.h"
#include "gxfont1.h"
#include "bfont.h"
#include "idict.h"
#include "idparam.h"
#include "ifont1.h"
#include "ifont2.h"
#include "ialloc.h"

/* Private utilities */
private uint
subr_bias(const ref * psubrs)
{
    uint size = r_size(psubrs);

    return (size < 1240 ? 107 : size < 33900 ? 1131 : 32768);
}

/*
 * Get the additional parameters for a Type 2 font (or FontType 2 FDArray
 * entry in a CIDFontType 0 font), beyond those common to Type 1 and Type 2
 * fonts.
 */
int
type2_font_params(const_os_ptr op, charstring_font_refs_t *pfr,
		  gs_type1_data *pdata1)
{
    int code;
    float dwx, nwx;
    ref *temp;

    pdata1->interpret = gs_type2_interpret;
    pdata1->lenIV = DEFAULT_LENIV_2;
    pdata1->subroutineNumberBias = subr_bias(pfr->Subrs);
    /* Get information specific to Type 2 fonts. */
    if (dict_find_string(pfr->Private, "GlobalSubrs", &temp) > 0) {
	if (!r_is_array(temp))
	    return_error(e_typecheck);
        pfr->GlobalSubrs = temp;
    }
    pdata1->gsubrNumberBias = subr_bias(pfr->GlobalSubrs);
    if ((code = dict_uint_param(pfr->Private, "gsubrNumberBias",
				0, max_uint, pdata1->gsubrNumberBias,
				&pdata1->gsubrNumberBias)) < 0 ||
	(code = dict_float_param(pfr->Private, "defaultWidthX", 0.0,
				 &dwx)) < 0 ||
	(code = dict_float_param(pfr->Private, "nominalWidthX", 0.0,
				 &nwx)) < 0
	)
	return code;
    pdata1->defaultWidthX = float2fixed(dwx);
    pdata1->nominalWidthX = float2fixed(nwx);
    {
	ref *pirs;

	if (dict_find_string(pfr->Private, "initialRandomSeed", &pirs) <= 0)
	    pdata1->initialRandomSeed = 0;
	else if (!r_has_type(pirs, t_integer))
	    return_error(e_typecheck);
	else
	    pdata1->initialRandomSeed = pirs->value.intval;
    }
    return 0;
}

/* <string|name> <font_dict> .buildfont2 <string|name> <font> */
/* Build a type 2 (compact Adobe encrypted) font. */
private int
zbuildfont2(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    charstring_font_refs_t refs;
    build_proc_refs build;
    int code = build_proc_name_refs(imemory, &build,
				    "%Type2BuildChar", "%Type2BuildGlyph");
    gs_type1_data data1;

    if (code < 0)
	return code;
    code = charstring_font_get_refs(op, &refs);
    if (code < 0)
	return code;
    code = type2_font_params(op, &refs, &data1);
    if (code < 0)
	return code;
    return build_charstring_font(i_ctx_p, op, &build, ft_encrypted2, &refs,
				 &data1, bf_notdef_required);
}

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

const op_def zfont2_op_defs[] =
{
    {"2.buildfont2", zbuildfont2},
    op_def_end(0)
};