/* 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: zdps1.c,v 1.8 2007/08/01 14:26:50 jemarch Exp $ */
/* Level 2 / Display PostScript graphics extensions */
#include "ghost.h"
#include "oper.h"
#include "gsmatrix.h"
#include "gspath.h"
#include "gspath2.h"
#include "gsstate.h"
#include "ialloc.h"
#include "igstate.h"
#include "ivmspace.h"
#include "store.h"
#include "stream.h"
#include "ibnum.h"

/* Forward references */
private int gstate_unshare(i_ctx_t *);

/* Declare exported procedures (for zupath.c) */
int zsetbbox(i_ctx_t *);

/* Structure descriptors */
public_st_igstate_obj();

/* Extend the `copy' operator to deal with gstates. */
/* This is done with a hack -- we know that gstates are the only */
/* t_astruct subtype that implements copy. */
private int
z1copy(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int code = zcopy(i_ctx_p);

    if (code >= 0)
	return code;
    if (!r_has_type(op, t_astruct))
	return code;
    return zcopy_gstate(i_ctx_p);
}

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

/* <bool> setstrokeadjust - */
private int
zsetstrokeadjust(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_boolean);
    gs_setstrokeadjust(igs, op->value.boolval);
    pop(1);
    return 0;
}

/* - currentstrokeadjust <bool> */
private int
zcurrentstrokeadjust(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    push(1);
    make_bool(op, gs_currentstrokeadjust(igs));
    return 0;
}

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

/*
 * Check to make sure that all the elements of a graphics state
 * can be stored in the given allocation space.
 */
/* ****** DOESN'T CHECK THE NON-REFS. ****** */
private int
gstate_check_space(i_ctx_t *i_ctx_p, int_gstate *isp, uint space)
{
    /*
     * ****** WORKAROUND ALERT ******
     * This code doesn't check the space of the non-refs, or copy their
     * contents, so it can create dangling references from global VM to
     * local VM.  Because of this, we simply disallow writing into gstates
     * in global VM (including creating them in the first place) if the
     * save level is greater than 0.
     * ****** WORKAROUND ALERT ******
     */
#if 1				/* ****** WORKAROUND ****** */
    if (space != avm_local && imemory_save_level(iimemory) > 0)
	return_error(e_invalidaccess);
#endif				/* ****** END ****** */
#define gsref_check(p) store_check_space(space, p)
    int_gstate_map_refs(isp, gsref_check);
#undef gsref_check
    return 0;
}

/* - gstate <gstate> */
int
zgstate(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    int code = gstate_check_space(i_ctx_p, istate, icurrent_space);
    igstate_obj *pigo;
    gs_state *pnew;
    int_gstate *isp;

    if (code < 0)
	return code;
    pigo = ialloc_struct(igstate_obj, &st_igstate_obj, "gstate");
    if (pigo == 0)
	return_error(e_VMerror);
    pnew = gs_state_copy(igs, imemory);
    if (pnew == 0) {
	ifree_object(pigo, "gstate");
	return_error(e_VMerror);
    }
    isp = gs_int_gstate(pnew);
    int_gstate_map_refs(isp, ref_mark_new);
    push(1);
    /*
     * Since igstate_obj isn't a ref, but only contains a ref, save won't
     * clear its l_new bit automatically, and restore won't set it
     * automatically; we have to make sure this ref is on the changes chain.
     */
    make_iastruct(op, a_all, pigo);
    make_null(&pigo->gstate);
    ref_save(op, &pigo->gstate, "gstate");
    make_istruct_new(&pigo->gstate, 0, pnew);
    return 0;
}

/* copy for gstates */
int
zcopy_gstate(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    os_ptr op1 = op - 1;
    gs_state *pgs;
    gs_state *pgs1;
    int_gstate *pistate;
    gs_memory_t *mem;
    int code;

    check_stype(*op, st_igstate_obj);
    check_stype(*op1, st_igstate_obj);
    check_write(*op);
    code = gstate_unshare(i_ctx_p);
    if (code < 0)
	return code;
    pgs = igstate_ptr(op);
    pgs1 = igstate_ptr(op1);
    pistate = gs_int_gstate(pgs);
    code = gstate_check_space(i_ctx_p, gs_int_gstate(pgs1), r_space(op));
    if (code < 0)
	return code;
#define gsref_save(p) ref_save(op, p, "copygstate")
    int_gstate_map_refs(pistate, gsref_save);
#undef gsref_save
    mem = gs_state_swap_memory(pgs, imemory);
    code = gs_copygstate(pgs, pgs1);
    gs_state_swap_memory(pgs, mem);
    if (code < 0)
	return code;
    int_gstate_map_refs(pistate, ref_mark_new);
    *op1 = *op;
    pop(1);
    return 0;
}

/* <gstate> currentgstate <gstate> */
int
zcurrentgstate(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_state *pgs;
    int_gstate *pistate;
    int code;
    gs_memory_t *mem;

    check_stype(*op, st_igstate_obj);
    check_write(*op);
    code = gstate_unshare(i_ctx_p);
    if (code < 0)
	return code;
    pgs = igstate_ptr(op);
    pistate = gs_int_gstate(pgs);
    code = gstate_check_space(i_ctx_p, istate, r_space(op));
    if (code < 0)
	return code;
#define gsref_save(p) ref_save(op, p, "currentgstate")
    int_gstate_map_refs(pistate, gsref_save);
#undef gsref_save
    mem = gs_state_swap_memory(pgs, imemory);
    code = gs_currentgstate(pgs, igs);
    gs_state_swap_memory(pgs, mem);
    if (code < 0)
	return code;
    int_gstate_map_refs(pistate, ref_mark_new);
    return 0;
}

/* <gstate> setgstate - */
int
zsetgstate(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int code;

    check_stype(*op, st_igstate_obj);
    check_read(*op);
    code = gs_setgstate(igs, igstate_ptr(op));
    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_RECTS 5
typedef struct local_rects_s {
    gs_rect *pr;
    uint count;
    gs_rect rl[MAX_LOCAL_RECTS];
} local_rects_t;

/* Forward references */
private int rect_get(local_rects_t *, os_ptr, gs_memory_t *);
private void rect_release(local_rects_t *, gs_memory_t *);

/* <x> <y> <width> <height> .rectappend - */
/* <numarray|numstring> .rectappend - */
private int
zrectappend(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    local_rects_t lr;
    int npop = rect_get(&lr, op, imemory);
    int code;

    if (npop < 0)
	return npop;
    code = gs_rectappend(igs, lr.pr, lr.count);
    rect_release(&lr, imemory);
    if (code < 0)
	return code;
    pop(npop);
    return 0;
}

/* <x> <y> <width> <height> rectclip - */
/* <numarray|numstring> rectclip - */
private int
zrectclip(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    local_rects_t lr;
    int npop = rect_get(&lr, op, imemory);
    int code;

    if (npop < 0)
	return npop;
    code = gs_rectclip(igs, lr.pr, lr.count);
    rect_release(&lr, imemory);
    if (code < 0)
	return code;
    pop(npop);
    return 0;
}

/* <x> <y> <width> <height> rectfill - */
/* <numarray|numstring> rectfill - */
private int
zrectfill(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    local_rects_t lr;
    int npop = rect_get(&lr, op, imemory);
    int code;

    if (npop < 0)
	return npop;
    code = gs_rectfill(igs, lr.pr, lr.count);
    rect_release(&lr, imemory);
    if (code < 0)
	return code;
    pop(npop);
    return 0;
}

/* <x> <y> <width> <height> rectstroke - */
/* <numarray|numstring> rectstroke - */
private int
zrectstroke(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_matrix mat;
    local_rects_t lr;
    int npop, code;

    if (read_matrix(imemory, op, &mat) >= 0) {
	/* Concatenate the matrix to the CTM just before stroking the path. */
	npop = rect_get(&lr, op - 1, imemory);
	if (npop < 0)
	    return npop;
	code = gs_rectstroke(igs, lr.pr, lr.count, &mat);
	npop++;
    } else {
	/* No matrix. */
	npop = rect_get(&lr, op, imemory);
	if (npop < 0)
	    return npop;
	code = gs_rectstroke(igs, lr.pr, lr.count, (gs_matrix *) 0);
    }
    rect_release(&lr, imemory);
    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_t * plr, os_ptr op, gs_memory_t *mem)
{
    int format, code;
    uint n, count;
    gs_rect *pr;
    double rv[4];

    switch (r_type(op)) {
	case t_array:
	case t_mixedarray:
	case t_shortarray:
	case t_string:
	    code = num_array_format(op);
	    if (code < 0)
		return code;
	    format = code;
	    count = num_array_size(op, format);
	    if (count % 4)
		return_error(e_typecheck);
	    count /= 4;
	    break;
	default:		/* better be 4 numbers */
	    code = num_params(op, 4, rv);
	    if (code < 0)
		return code;
	    plr->pr = plr->rl;
	    plr->count = 1;
	    plr->rl[0].q.x = (plr->rl[0].p.x = rv[0]) + rv[2];
	    plr->rl[0].q.y = (plr->rl[0].p.y = rv[1]) + rv[3];
	    return 4;
    }
    plr->count = count;
    if (count <= MAX_LOCAL_RECTS)
	pr = plr->rl;
    else {
	pr = (gs_rect *)gs_alloc_byte_array(mem, 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;
	int i;

	for (i = 0; i < 4; i++) {
	    code = num_array_get(mem, (const ref *)op, format,
				 (n << 2) + i, &rnum);
	    switch (code) {
		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 1;
}

/* Release the rectangle list if needed. */
private void
rect_release(local_rects_t * plr, gs_memory_t *mem)
{
    if (plr->pr != plr->rl)
	gs_free_object(mem, plr->pr, "rect_release");
}

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

/* <llx> <lly> <urx> <ury> setbbox - */
int
zsetbbox(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    double 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 ------ */

const op_def zdps1_l2_op_defs[] =
{
    op_def_begin_level2(),
		/* Graphics state */
    {"0currentstrokeadjust", zcurrentstrokeadjust},
    {"1setstrokeadjust", zsetstrokeadjust},
		/* Graphics state objects */
    {"1copy", z1copy},
    {"1currentgstate", zcurrentgstate},
    {"0gstate", zgstate},
    {"1setgstate", zsetgstate},
		/* Rectangles */
    {"1.rectappend", zrectappend},
    {"1rectclip", zrectclip},
    {"1rectfill", zrectfill},
    {"1rectstroke", zrectstroke},
		/* Graphics state components */
    {"4setbbox", zsetbbox},
    op_def_end(0)
};

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

/* Ensure that a gstate is not shared with an outer save level. */
/* *op is of type t_astruct(igstate_obj). */
private int
gstate_unshare(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    ref *pgsref = &r_ptr(op, igstate_obj)->gstate;
    gs_state *pgs = r_ptr(pgsref, gs_state);
    gs_state *pnew;
    int_gstate *isp;

    if (!ref_must_save(pgsref))
	return 0;
    /* Copy the gstate. */
    pnew = gs_gstate(pgs);
    if (pnew == 0)
	return_error(e_VMerror);
    isp = gs_int_gstate(pnew);
    int_gstate_map_refs(isp, ref_mark_new);
    ref_do_save(op, pgsref, "gstate_unshare");
    make_istruct_new(pgsref, 0, pnew);
    return 0;
}
