/* Copyright (C) 1990, 1992, 1993 Aladdin Enterprises.  All rights reserved.

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.  */

/* zdps1.c */
/* Display PostScript graphics extensions */
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "gsmatrix.h"
#include "gspath.h"
#include "gsstate.h"
#include "alloc.h"
#include "ivmspace.h"
#include "state.h"
#include "store.h"
#include "stream.h"
#include "bnum.h"

/* Imported data */
extern op_proc_p zcopy_procs[t_next_index];

/* Forward references */
private int zcopy_gstate(P1(os_ptr));

/* Initialize by adding an entry for gstates to the `copy' operator. */
private void
zdps1_init(void)
{	zcopy_procs[t_gstate] = zcopy_gstate;
}

/* ------ Graphics state ------ */

/* <bool> setstrokeadjust - */
int
zsetstrokeadjust(register os_ptr op)
{	check_type(*op, t_boolean);
	gs_setstrokeadjust(igs, op->value.index);
	pop(1);
	return 0;
}

/* - currentstrokeadjust <bool> */
int
zcurrentstrokeadjust(register os_ptr op)
{	push(1);
	make_bool(op, gs_currentstrokeadjust(igs));
	return 0;
}

/* <x> <y> sethalftonephase - */
int
zsethalftonephase(register os_ptr op)
{	int code;
	long x, y;
	check_type(op[-1], t_integer);
	check_type(*op, t_integer);
	x = op[-1].value.intval;
	y = op->value.intval;
	if ( x != (int)x || y != (int)y )
		return_error(e_rangecheck);
	code = gs_sethalftonephase(igs, (int)x, (int)y);
	if ( code >= 0 ) pop(2);
	return code;
}

/* - currenthalftonephase <x> <y> */
int
zcurrenthalftonephase(register os_ptr op)
{	gs_int_point phase;
	gs_currenthalftonephase(igs, &phase);
	push(2);
	make_int(op - 1, phase.x);
	make_int(op, phase.y);
	return 0;
}

/* ------ Graphics state objects ------ */

/* Check to make sure that all the elements of a graphics state */
/* are global.  ****** DOESN'T CHECK THE NON-REFS. ****** */
private int
gstate_check_global(int_gstate *isp)
{
#define gsref_check(p) check_global(*(p))
	int_gstate_map_refs(isp, gsref_check);
#undef gsref_check
	return 0;
}

/* - gstate <gstate> */
int
zgstate(register os_ptr op)
{	gs_state *pnew;
	int_gstate *isp;
	if ( !alloc_current_local() )
	{	int code = gstate_check_global(&istate);
		if ( code < 0 ) return code;
	}
	pnew = gs_gstate(igs);
	if ( pnew == 0 )
		return_error(e_VMerror);
	isp = (int_gstate *)gs_state_client_data(pnew);
	int_gstate_map_refs(isp, ref_mark_new);
	push(1);
	make_tv(op, t_gstate, pgstate, pnew);
	return 0;
}

/* copy for gstates */
private int
zcopy_gstate(register os_ptr op)
{	os_ptr op1 = op - 1;
	gs_state *pgs;
	gs_state *pgs1;
	int_gstate *pistate;
	int code;
	check_type(*op, t_gstate);
	check_type(*op1, t_gstate);
	pgs = op->value.pgstate;
	pgs1 = op1->value.pgstate;
	pistate = (int_gstate *)gs_state_client_data(pgs);
	if ( !r_is_global(op) )
	{	code = gstate_check_global((int_gstate *)gs_state_client_data(pgs1));
		if ( code < 0 ) return code;
	}
#define gsref_save(p) ref_save(p, "currentgstate")
	int_gstate_map_refs(pistate, gsref_save);
#undef gsref_save
	/****** DOESN'T GET FULLY UNDONE BY RESTORE ******/
	code = gs_copygstate(pgs, pgs1);
	if ( code < 0 ) return code;
	int_gstate_map_refs(pistate, ref_mark_new);
	*op1 = *op;
	pop(1);
	return 0;
}

/* <gstate> currentgstate <gstate> */
int
zcurrentgstate(register os_ptr op)
{	int code;
	int_gstate *pistate;
	check_type(*op, t_gstate);
	pistate = (int_gstate *)gs_state_client_data(op->value.pgstate);
	if ( !r_is_global(op) )
	{	code = gstate_check_global(&istate);
		if ( code < 0 ) return code;
	}
#define gsref_save(p) ref_save(p, "currentgstate")
	int_gstate_map_refs(pistate, gsref_save);
#undef gsref_save
	/****** DOESN'T GET FULLY UNDONE BY RESTORE ******/
	code = gs_currentgstate(op->value.pgstate, igs);
	if ( code < 0 ) return code;
	int_gstate_map_refs(pistate, ref_mark_new);
	return 0;
}

/* <gstate> setgstate - */
int
zsetgstate(register os_ptr op)
{	int code;
	check_type(*op, t_gstate);
	code = gs_setgstate(igs, op->value.pgstate);
	if ( code < 0 ) return code;
	pop(1);
	return 0;
}

/* ------ Rectangles ------- */

/* We preallocate a short list for rectangles, because */
/* the rectangle operators usually will involve very few rectangles. */
#define max_local_rect 5
typedef struct local_rects_s {
	gs_rect *pr;
	uint count;
	gs_rect rl[max_local_rect];
} local_rects;

/* Forward references */
private int rect_get(P2(local_rects *, os_ptr));
private void rect_release(P1(local_rects *));

/* <x> <y> <width> <height> rectappend - */
/* <numarray|numstring> rectappend - */
int
zrectappend(os_ptr op)
{	local_rects lr;
	int npop = rect_get(&lr, op);
	int code;
	if ( npop < 0 ) return npop;
	code = gs_rectappend(igs, lr.pr, lr.count);
	rect_release(&lr);
	if ( code < 0 ) return code;
	pop(npop);
	return 0;
}

/* <x> <y> <width> <height> rectclip - */
/* <numarray|numstring> rectclip - */
int
zrectclip(os_ptr op)
{	local_rects lr;
	int npop = rect_get(&lr, op);
	int code;
	if ( npop < 0 ) return npop;
	code = gs_rectclip(igs, lr.pr, lr.count);
	rect_release(&lr);
	if ( code < 0 ) return code;
	pop(npop);
	return 0;
}

/* <x> <y> <width> <height> rectfill - */
/* <numarray|numstring> rectfill - */
int
zrectfill(os_ptr op)
{	local_rects lr;
	int npop = rect_get(&lr, op);
	int code;
	if ( npop < 0 ) return npop;
	code = gs_rectfill(igs, lr.pr, lr.count);
	rect_release(&lr);
	if ( code < 0 ) return code;
	pop(npop);
	return 0;
}

/* <x> <y> <width> <height> rectstroke - */
/* <numarray|numstring> rectstroke - */
int
zrectstroke(os_ptr op)
{	gs_matrix mat;
	local_rects lr;
	int npop, code;
	if ( read_matrix(op, &mat) >= 0 )
	   {	/* Concatenate the matrix to the CTM just before */
		/* stroking the path. */
		npop = rect_get(&lr, op - 1);
		if ( npop < 0 ) return npop;
		code = gs_rectstroke(igs, lr.pr, lr.count, &mat);
		npop++;
	   }
	else
	   {	/* No matrix. */
		npop = rect_get(&lr, op);
		if ( npop < 0 ) return npop;
		code = gs_rectstroke(igs, lr.pr, lr.count, (gs_matrix *)0);
	   }
	rect_release(&lr);
	if ( code < 0 ) return code;
	pop(npop);
	return 0;
}

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

/* Get rectangles from the stack. */
/* Return the number of elements to pop (>0) if OK, <0 if error. */
private int
rect_get(local_rects *plr, os_ptr op)
{	int code, npop;
	stream st;
	uint n, count;
	gs_rect *pr;
	switch ( r_type(op) )
	   {
	case t_array:
	case t_string:
		code = sread_num_array(&st, op);
		if ( code < 0 ) return code;
		count = scount_num_stream(&st);
		if ( count % 4 )
			return_error(e_typecheck);
		count /= 4, npop = 1;
		break;
	default:			/* better be 4 numbers */
		sread_string(&st, (byte *)(op - 3), sizeof(ref) * 4);
		st.num_format = num_array;
		count = 1, npop = 4;
		break;
	   }
	plr->count = count;
	if ( count <= max_local_rect )
		pr = plr->rl;
	else
	   {	pr = (gs_rect *)alloc(count, sizeof(gs_rect), "rect_get");
		if ( pr == 0 )
			return_error(e_VMerror);
	   }
	plr->pr = pr;
	for ( n = 0; n < count; n++, pr++ )
	   {	ref rnum;
		float rv[4];
		int i;
		for ( i = 0; i < 4; i++ )
		   {	switch ( code = sget_encoded_number(&st, &rnum) )
			   {
			case t_integer:
				rv[i] = rnum.value.intval;
				break;
			case t_real:
				rv[i] = rnum.value.realval;
				break;
			default:	/* code < 0 */
				return code;
			   }
		   }
		pr->q.x = (pr->p.x = rv[0]) + rv[2];
		pr->q.y = (pr->p.y = rv[1]) + rv[3];
	   }
	return npop;
}

/* Release the rectangle list if needed. */
private void
rect_release(local_rects *plr)
{	if ( plr->pr != plr->rl )
		alloc_free((char *)plr->pr, plr->count, sizeof(gs_rect),
			   "rect_release");
}

/* ------ Graphics state ------ */

/* <llx> <lly> <urx> <ury> setbbox - */
int
zsetbbox(register os_ptr op)
{	float box[4];
	int code = num_params(op, 4, box);
	if ( code < 0 ) return code;
	if ( (code = gs_setbbox(igs, box[0], box[1], box[2], box[3])) < 0 )
		return code;
	pop(4);
	return 0;
}

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

op_def zdps1_op_defs[] = {
		/* Graphics state */
	{"0currenthalftonephase", zcurrenthalftonephase},
	{"0currentstrokeadjust", zcurrentstrokeadjust},
	{"2sethalftonephase", zsethalftonephase},
	{"1setstrokeadjust", zsetstrokeadjust},
		/* Graphics state objects */
	{"1currentgstate", zcurrentgstate},
	{"0gstate", zgstate},
	{"1setgstate", zsetgstate},
		/* Rectangles */
	{"1rectappend", zrectappend},
	{"1rectclip", zrectclip},
	{"1rectfill", zrectfill},
	{"1rectstroke", zrectstroke},
		/* Graphics state components */
	{"4setbbox", zsetbbox},
	op_def_end(zdps1_init)
};