/* Copyright (C) 2001-2006 artofcode LLC.
   All Rights Reserved.
  
  This file is part of GNU ghostscript

  GNU ghostscript is free software; you can redistribute it and/or
  modify it under the terms of the version 2 of the GNU General Public
  License as published by the Free Software Foundation.

  GNU ghostscript is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with
  ghostscript; see the file COPYING. If not, write to the Free Software Foundation,
  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

*/

/* $Id: zfont0.c,v 1.7 2007/08/01 14:26:51 jemarch Exp $ */
/* Composite font creation operator */
#include "ghost.h"
#include "oper.h"
#include "gsstruct.h"
/*
 * The following lines used to say:
 *      #include "gsmatrix.h"
 *      #include "gxdevice.h"           /. for gxfont.h ./
 * Tony Li says the longer list is necessary to keep the GNU compiler
 * happy, but this is pretty hard to understand....
 */
#include "gxfixed.h"
#include "gxmatrix.h"
#include "gzstate.h"		/* must precede gxdevice */
#include "gxdevice.h"		/* must precede gxfont */
#include "gxfcmap.h"
#include "gxfont.h"
#include "gxfont0.h"
#include "bfont.h"
#include "ialloc.h"
#include "iddict.h"
#include "idparam.h"
#include "igstate.h"
#include "iname.h"
#include "store.h"

/* Imported from zfcmap.c */
int ztype0_get_cmap(const gs_cmap_t ** ppcmap, const ref * pfdepvector,
		    const ref * op, gs_memory_t *imem);

/* Forward references */
private font_proc_define_font(ztype0_define_font);
private font_proc_make_font(ztype0_make_font);
private int ensure_char_entry(i_ctx_t *, os_ptr, const char *, byte *, int);

/* <string|name> <font_dict> .buildfont0 <string|name> <font> */
/* Build a type 0 (composite) font. */
private int
zbuildfont0(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_type0_data data;
    ref fdepvector;
    ref *pprefenc;
    gs_font_type0 *pfont;
    font_data *pdata;
    ref save_FID;
    int i;
    int code = 0;

    check_type(*op, t_dictionary);
    {
	ref *pfmaptype;
	ref *pfdepvector;

	if (dict_find_string(op, "FMapType", &pfmaptype) <= 0 ||
	    !r_has_type(pfmaptype, t_integer) ||
	    pfmaptype->value.intval < (int)fmap_type_min ||
	    pfmaptype->value.intval > (int)fmap_type_max ||
	    dict_find_string(op, "FDepVector", &pfdepvector) <= 0 ||
	    !r_is_array(pfdepvector)
	    )
	    return_error(e_invalidfont);
	data.FMapType = (fmap_type) pfmaptype->value.intval;
	/*
	 * Adding elements below could cause the font dictionary to be
	 * resized, which would invalidate pfdepvector.
	 */
	fdepvector = *pfdepvector;
    }
    /* Check that every element of the FDepVector is a font. */
    data.fdep_size = r_size(&fdepvector);
    for (i = 0; i < data.fdep_size; i++) {
	ref fdep;
	gs_font *psub;

	array_get(imemory, &fdepvector, i, &fdep);
	if ((code = font_param(&fdep, &psub)) < 0)
	    return code;
	/*
	 * Check the inheritance rules.  Allowed configurations
	 * (paths from root font) are defined by the regular
	 * expression:
	 *      (shift | double_escape escape* | escape*)
	 *        non_modal* non_composite
	 */
	if (psub->FontType == ft_composite) {
	    const gs_font_type0 *const psub0 = (const gs_font_type0 *)psub;
	    fmap_type fmt = psub0->data.FMapType;

	    if (fmt == fmap_double_escape ||
		fmt == fmap_shift ||
		(fmt == fmap_escape &&
		 !(data.FMapType == fmap_escape ||
		   data.FMapType == fmap_double_escape))
		)
		return_error(e_invalidfont);
	}
    }
    switch (data.FMapType) {
	case fmap_escape:
	case fmap_double_escape:	/* need EscChar */
	    code = ensure_char_entry(i_ctx_p, op, "EscChar", &data.EscChar, 255);
	    break;
	case fmap_shift:	/* need ShiftIn & ShiftOut */
	    code = ensure_char_entry(i_ctx_p, op, "ShiftIn", &data.ShiftIn, 15);
	    if (code >= 0)
		code = ensure_char_entry(i_ctx_p, op, "ShiftOut", &data.ShiftOut, 14);
	    break;
	case fmap_SubsVector:	/* need SubsVector */
	    {
		ref *psubsvector;
		uint svsize;

		if (dict_find_string(op, "SubsVector", &psubsvector) <= 0 ||
		    !r_has_type(psubsvector, t_string) ||
		    (svsize = r_size(psubsvector)) == 0 ||
		(data.subs_width = (int)*psubsvector->value.bytes + 1) > 4 ||
		    (svsize - 1) % data.subs_width != 0
		    )
		    return_error(e_invalidfont);
		data.subs_size = (svsize - 1) / data.subs_width;
		data.SubsVector.data = psubsvector->value.bytes + 1;
		data.SubsVector.size = svsize - 1;
	    } break;
	case fmap_CMap:	/* need CMap */
	    code = ztype0_get_cmap(&data.CMap, (const ref *)&fdepvector,
				   (const ref *)op, imemory);
	    break;
	default:
	    ;
    }
    if (code < 0)
	return code;
    /*
     * Save the old FID in case we have to back out.
     * build_gs_font will return an error if there is a FID entry
     * but it doesn't reference a valid font.
     */
    {
	ref *pfid;

	if (dict_find_string(op, "FID", &pfid) <= 0)
	    make_null(&save_FID);
	else
	    save_FID = *pfid;
    }
    {
	build_proc_refs build;

	code = build_proc_name_refs(imemory, &build,
				    "%Type0BuildChar", "%Type0BuildGlyph");
	if (code < 0)
	    return code;
	code = build_gs_font(i_ctx_p, op, (gs_font **) & pfont,
			     ft_composite, &st_gs_font_type0, &build,
			     bf_options_none);
    }
    if (code != 0)
	return code;
    /* Fill in the rest of the basic font data. */
    pfont->procs.init_fstack = gs_type0_init_fstack;
    pfont->procs.define_font = ztype0_define_font;
    pfont->procs.make_font = ztype0_make_font;
    pfont->procs.next_char_glyph = gs_type0_next_char_glyph;
    pfont->procs.decode_glyph = gs_font_map_glyph_to_unicode; /* PDF needs. */
    if (dict_find_string(op, "PrefEnc", &pprefenc) <= 0) {
	ref nul;

	make_null_new(&nul);
	if ((code = idict_put_string(op, "PrefEnc", &nul)) < 0)
	    goto fail;
    }
    get_GlyphNames2Unicode(i_ctx_p, (gs_font *)pfont, op);
    /* Fill in the font data */
    pdata = pfont_data(pfont);
    data.encoding_size = r_size(&pdata->Encoding);
    /*
     * Adobe interpreters apparently require that Encoding.size >= subs_size
     * +1 (not sure whether the +1 only applies if the sum of the range
     * sizes is less than the size of the code space).  The gs library
     * doesn't require this -- it only gives an error if a show operation
     * actually would reference beyond the end of the Encoding -- so we
     * check this here rather than in the library.
     */
    if (data.FMapType == fmap_SubsVector) {
	if (data.subs_size >= r_size(&pdata->Encoding)) {
	    code = gs_note_error(e_rangecheck);
	    goto fail;
	}
    }
    data.Encoding =
	(uint *) ialloc_byte_array(data.encoding_size, sizeof(uint),
				   "buildfont0(Encoding)");
    if (data.Encoding == 0) {
	code = gs_note_error(e_VMerror);
	goto fail;
    }
    /* Fill in the encoding vector, checking to make sure that */
    /* each element is an integer between 0 and fdep_size-1. */
    for (i = 0; i < data.encoding_size; i++) {
	ref enc;

	array_get(imemory, &pdata->Encoding, i, &enc);
	if (!r_has_type(&enc, t_integer)) {
	    code = gs_note_error(e_typecheck);
	    goto fail;
	}
	if ((ulong) enc.value.intval >= data.fdep_size) {
	    code = gs_note_error(e_rangecheck);
	    goto fail;
	}
	data.Encoding[i] = (uint) enc.value.intval;
    }
    data.FDepVector =
	ialloc_struct_array(data.fdep_size, gs_font *,
			    &st_gs_font_ptr_element,
			    "buildfont0(FDepVector)");
    if (data.FDepVector == 0) {
	code = gs_note_error(e_VMerror);
	goto fail;
    }
    for (i = 0; i < data.fdep_size; i++) {
	ref fdep;
	ref *pfid;

	array_get(pfont->memory, &fdepvector, i, &fdep);
	/* The lookup can't fail, because of the pre-check above. */
	dict_find_string(&fdep, "FID", &pfid);
	data.FDepVector[i] = r_ptr(pfid, gs_font);
    }
    pfont->data = data;
    code = define_gs_font((gs_font *) pfont);
    if (code >= 0)
	return code;
fail:
	/*
	 * Undo the insertion of the FID entry in the dictionary.  Note that
	 * some allocations (Encoding, FDepVector) are not undone.
	 */
    if (r_has_type(&save_FID, t_null)) {
	ref rnfid;

	name_enter_string(pfont->memory, "FID", &rnfid);
	idict_undef(op, &rnfid);
    } else
	idict_put_string(op, "FID", &save_FID);
    gs_free_object(pfont->memory, pfont, "buildfont0(font)");
    return code;
}
/* If a newly defined or scaled composite font had to scale */
/* any composite sub-fonts, adjust the parent font's FDepVector. */
/* This is called only if gs_type0_define/make_font */
/* actually changed the FDepVector. */
private int
ztype0_adjust_FDepVector(gs_font_type0 * pfont)
{
    gs_memory_t *mem = pfont->memory;
    /* HACK: We know the font was allocated by the interpreter. */
    gs_ref_memory_t *imem = (gs_ref_memory_t *)mem;
    gs_font **pdep = pfont->data.FDepVector;
    ref newdep;
    uint fdep_size = pfont->data.fdep_size;
    ref *prdep;
    uint i;
    int code = gs_alloc_ref_array(imem, &newdep, a_readonly, fdep_size,
				  "ztype0_adjust_matrix");

    if (code < 0)
	return code;
    for (prdep = newdep.value.refs, i = 0; i < fdep_size; i++, prdep++) {
	const ref *pdict = pfont_dict(pdep[i]);

	ref_assign(prdep, pdict);
	r_set_attrs(prdep, imemory_new_mask(imem));
    }
    /*
     * The FDepVector is an existing key in the parent's dictionary,
     * so it's safe to pass NULL as the dstack pointer to dict_put_string.
     */
    return dict_put_string(pfont_dict(pfont), "FDepVector", &newdep, NULL);
}
private int
ztype0_define_font(gs_font_dir * pdir, gs_font * pfont)
{
    gs_font_type0 *const pfont0 = (gs_font_type0 *)pfont;
    gs_font **pdep = pfont0->data.FDepVector;
    int code = gs_type0_define_font(pdir, pfont);

    if (code < 0 || pfont0->data.FDepVector == pdep)
	return code;
    return ztype0_adjust_FDepVector(pfont0);
}
private int
ztype0_make_font(gs_font_dir * pdir, const gs_font * pfont,
		 const gs_matrix * pmat, gs_font ** ppfont)
{
    gs_font_type0 **const ppfont0 = (gs_font_type0 **)ppfont;
    gs_font **pdep = (*ppfont0)->data.FDepVector;
    int code;

    code = zdefault_make_font(pdir, pfont, pmat, ppfont);
    if (code < 0)
	return code;
    code = gs_type0_make_font(pdir, pfont, pmat, ppfont);
    if (code < 0)
	return code;
    if ((*ppfont0)->data.FDepVector == pdep)
	return 0;
    return ztype0_adjust_FDepVector(*ppfont0);
}

/* ------ Internal routines ------ */

/* Find or add a character entry in a font dictionary. */
private int
ensure_char_entry(i_ctx_t *i_ctx_p, os_ptr op, const char *kstr,
		  byte * pvalue, int default_value)
{
    ref *pentry;

    if (dict_find_string(op, kstr, &pentry) <= 0) {
	ref ent;

	make_int(&ent, default_value);
	*pvalue = (byte) default_value;
	return idict_put_string(op, kstr, &ent);
    } else {
	check_int_leu_only(*pentry, 255);
	*pvalue = (byte) pentry->value.intval;
	return 0;
    }
}

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

const op_def zfont0_op_defs[] =
{
    {"2.buildfont0", zbuildfont0},
    op_def_end(0)
};
