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/* Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

This file is part of Ghostscript.

Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.  */

/* zfont.c */
/* Font operators for GhostScript */
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "gsmatrix.h"
#include "gxdevice.h"		/* for gxfont.h */
#include "gxfont.h"
#include "alloc.h"
#include "font.h"
#include "dict.h"
#include "state.h"
#include "store.h"

/* Forward references */
private int font_param(P2(ref *, gs_font **));
private int add_FID(P2(ref *, gs_font *));
private int make_font(P2(ref *, gs_matrix *));
private int make_uint_array(P3(ref *, uint *, int));

/* Imported from util.h */
extern int num_params(P3(ref *, int, float *));

/* The (global) font directory */
private gs_font_dir *ifont_dir;

/* Import font-related objects */
extern ref name_FontDirectory;
extern ref
  name_FontMatrix, name_FontType, name_FontBBox,
  name_Encoding, name_BuildChar, name_FID;
extern ref null;	/* for null build procedure */

/* Import systemdict for looking up FontDirectory */
extern ref dstack[];
#define systemdict (dstack[0])

/* Initialize the font operators */
void
zfont_init()
{	ifont_dir = gs_font_dir_alloc(alloc, alloc_free);
}

/* definefont */
int
zdefinefont(register ref *op)
{	ref *pFontDirectory;
	int code;
	ref *pfid;
	/* Validate and unpack the font. */
	ref *pmatrix, *ptype, *pbbox, *pencoding, *pbuildchar;
	gs_matrix mat;
	float bbox[4];
	check_op(2);
	check_type(*op, t_dictionary);
	if ( dict_find(dstack, &name_FontDirectory, &pFontDirectory) <= 0 )
		return e_invalidfont;	/* no FontDirectory?? */
	if ( dict_find(op, &name_FontMatrix, &pmatrix) <= 0 ||
	    dict_find(op, &name_FontType, &ptype) <= 0 ||
	       r_type(ptype) != t_integer || (ulong)(ptype->value.intval) > 255 ||
	    dict_find(op, &name_FontBBox, &pbbox) <= 0 ||
	      r_type(pbbox) != t_array || pbbox->size != 4 ||
	    dict_find(op, &name_Encoding, &pencoding) <= 0 ||
	      r_type(pencoding) != t_array || pencoding->size != 256 ||
	    read_matrix(pmatrix, &mat) < 0 ||
	    num_params(pbbox->value.refs + 3, 4, bbox) < 0
	   )
	  return e_invalidfont;
	/* In contrast to what is stated (or at least implied) in */
	/* the PostScript manual, every font in GhostScript */
	/* must have a BuildChar procedure. */
	if ( dict_find(op, &name_BuildChar, &pbuildchar) <= 0 )
	  return e_invalidfont;
	check_proc(*pbuildchar);
	code = dict_find(op, &name_FID, &pfid);
	if ( r_attrs(op) & a_write )
	{	/* Assume this is a new font */
		gs_font *pfont;
		font_data *pdata;
		if ( code > 0 ) return e_invalidfont;	/* has FID already */
		if ( (pfont = (gs_font *)alloc(sizeof(gs_font), "definefont(font)")) == 0 ||
		     (pdata = (font_data *)alloc(sizeof(font_data), "definefont(data)")) == 0
		   )
		  return e_VMerror;
		if ( (code = add_FID(op, pfont)) < 0 ) return code;
		store_i(&pdata->dict, op);
		store_i(&pdata->BuildChar, pbuildchar);
		store_i(&pdata->Encoding, pencoding);
		pfont->base = pfont;
		pfont->dir = ifont_dir;
		pfont->client_data = (char *)pdata;
		pfont->matrix = mat;
		pfont->font_type = ptype->value.intval;
		pfont->xmin = bbox[0];
		pfont->ymin = bbox[1];
		pfont->xmax = bbox[2];
		pfont->ymax = bbox[3];
		pfont->build_char_proc = gs_no_build_char_proc;
	}
	else
	{	/* Assume this was made by makefont or scalefont */
		if ( code <= 0 ) return e_invalidfont;	/* no FID */
	}
	r_clear_attrs(op, a_write);	/****** SHOULD ALTER DICT ACCESS ******/
	if ( (code = dict_put(pFontDirectory, op - 1, op)) < 0 ) return code;
	op[-1] = *op;
	pop(1);
	return 0;
}

/* scalefont */
int
zscalefont(register ref *op)
{	int code;
	float scale;
	gs_matrix mat;
	if ( (code = num_params(op, 1, &scale)) < 0 ) return code;
	if ( (code = gs_make_scaling(scale, scale, &mat)) < 0 ) return code;
	return make_font(op, &mat);
}

/* makefont */
int
zmakefont(register ref *op)
{	int code;
	gs_matrix mat;
	if ( (code = read_matrix(op, &mat)) < 0 ) return code;
	return make_font(op, &mat);
}

/* setfont */
int
zsetfont(register ref *op)
{	gs_font *pfont;
	int code = font_param(op, &pfont);
	if ( code < 0 || (code = gs_setfont(igs, pfont)) < 0 )
	  return code;
	istate.font = *op;
	pop(1);
	return code;
}

/* currentfont */
int
zcurrentfont(register ref *op)
{	push(1);
	*op = istate.font;
	return 0;
}

/* cachestatus */
int
zcachestatus(register ref *op)
{	uint status[7];
	gs_cachestatus(ifont_dir, status);
	push(7);
	make_uint_array(op - 6, status, 7);
	return 0;
}

/* setcachelimit */
int
zsetcachelimit(register ref *op)
{	int code = num_params(op, 1, (float *)0);
	long limit;
	if ( code != 1 ) return (code < 0 ? code : e_typecheck);
	limit = op->value.intval;
	if ( limit < 0 || limit > (uint)(-1) )
		return e_rangecheck;
	gs_setcachelimit(ifont_dir, (uint)limit);
	pop(1);
	return 0;
}

/* setcacheparams */
int
zsetcacheparams(register ref *op)
{	uint params[2];
	int i, code;
	for ( i = 0; i < 2 && r_type(op - i) != t_mark ; i++ )
	   {	long parm;
		code = num_params(op - i, 1, (float *)0);
		if ( code != 1 ) return (code < 0 ? code : e_typecheck);
		parm = op[-i].value.intval;
		if ( parm < 0 || parm > (uint)(-1) )
			return e_rangecheck;
		params[i] = parm;
	   }
	switch ( i )
	   {
	case 2:
		if ( (code = gs_setcachelower(ifont_dir, params[1])) < 0 )
			return code;
	case 1:
		if ( (code = gs_setcacheupper(ifont_dir, params[0])) < 0 )
			return code;
	case 0: ;
	   }
	return zcleartomark(op);
}

/* currentcacheparams */
int
zcurrentcacheparams(register ref *op)
{	uint params[2];
	params[0] = gs_currentcachelower(ifont_dir);
	params[1] = gs_currentcacheupper(ifont_dir);
	push(3);
	make_tv(op - 2, t_mark, intval, 0);
	make_uint_array(op - 1, params, 2);
	return 0;
}

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

void
zfont_op_init()
{	static op_def my_defs[] = {
		{"0currentfont", zcurrentfont},
		{"2definefont", zdefinefont},
		{"2makefont", zmakefont},
		{"2scalefont", zscalefont},
		{"1setfont", zsetfont},
		{"0cachestatus", zcachestatus},
		{"1setcachelimit", zsetcachelimit},
		{"1setcacheparams", zsetcacheparams},
		{"0currentcacheparams", zcurrentcacheparams},
		op_def_end
	};
	z_op_init(my_defs);
}

/* ------ Subroutines ------ */

/* Validate a font parameter. */
private int
font_param(ref *fp, gs_font **pfont)
{	/* Check that fp is a read-only dictionary, */
	/* and that it has a FID entry. */
	ref *pid;
	int code;
	check_type(*fp, t_dictionary);
	if ( (code = dict_find(fp, &name_FID, &pid)) < 0 ) return code;
	*pfont = pid->value.pfont;
	if ( *pfont == 0 ) return e_invalidfont; /* unregistered font */
	return 0;
}

/* Add the FID entry to a font dictionary. */
private int
add_FID(ref *fp /* t_dictionary */,  gs_font *pfont)
{	ref fid;
	make_tv(&fid, t_fontID, pfont, pfont);
	return dict_put(fp, &name_FID, &fid);
}

/* Make a transformed font (common code for makefont/scalefont). */
private int
make_font(ref *op, gs_matrix *pmat)
{	ref *fp = op - 1;
	gs_font *oldfont, *newfont, *ffont;
	ref newdict;
	ref newmat;
	int code;
	make_int(&newmat, 6);	/* for zarray */
	if ( (code = font_param(fp, &oldfont)) < 0 ||
	     (code = gs_makefont(ifont_dir, oldfont, pmat,
				 &newfont, &ffont)) < 0 ||
	     (code = dict_create(dict_maxlength(fp), &newdict)) < 0 ||
	     (code = dict_copy(fp, &newdict)) < 0 ||
	     (code = zarray(&newmat)) < 0 ||
	     (code = dict_put(&newdict, &name_FontMatrix, &newmat)) < 0 ||
	     (code = add_FID(&newdict, newfont)) < 0
	   )
	  return code;
	*(gs_matrix *)(newmat.value.refs) = newfont->matrix;
	if ( ffont )
	  { /****** SHOULD DECREMENT REFCT ******/
	  }
	*fp = newdict;
	r_clear_attrs(fp, a_write);	/****** SHOULD SET DICT ACCESS ******/
	pop(1);
	return 0;
}

/* Convert an array of (unsigned) integers to stack form. */
private int
make_uint_array(register ref *op, uint *intp, int count)
{	int i;
	for ( i = 0; i < count; i++, op++, intp++ )
		make_int(op, *intp);
}
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