File: zfont2.c

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/* Copyright (C) 2001-2006 Artifex Software, Inc.
   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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: zfont2.c 9043 2008-08-28 22:48:19Z giles $ */
/* 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 */
static 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. */
static 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)
};