/* 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.
*/

/* $Id$ */
/* Display PostScript extensions */
#include "gx.h"
#include "gserrors.h"
#include "gsdps.h"
#include "gspath.h"		/* for newpath */
#include "gxdevice.h"		/* for gxcpath.h */
#include "gzpath.h"		/* for gzcpath.h */
#include "gzstate.h"
#include "gzcpath.h"

/* ---------------- View clipping ---------------- */

/* Forward references */
static int common_viewclip(gs_state *, int);

int
gs_initviewclip(gs_state * pgs)
{
    gx_clip_path *pcpath = pgs->view_clip;

    if (pcpath != 0 && pcpath->rule != 0) {
        gx_cpath_reset(pcpath);
        pcpath->rule = 0;
    }
    return 0;
}

int
gs_viewclip(gs_state * pgs)
{
    return common_viewclip(pgs, gx_rule_winding_number);
}

int
gs_eoviewclip(gs_state * pgs)
{
    return common_viewclip(pgs, gx_rule_even_odd);
}

/* This code is (almost) copied from common_clip in gspath.c. */
/* Someday we'll find a way to merge them. */
static int
common_viewclip(gs_state * pgs, int rule)
{
    gs_fixed_rect bbox;
    gx_clip_path rpath;
    int code;
    gx_clip_path *pcpath = pgs->view_clip;

    if (pcpath == 0) {
        pcpath = gx_cpath_alloc(pgs->memory, "gs_[eo]viewclip");
        if (pcpath == 0)
            return_error(gs_error_VMerror);
        pgs->view_clip = pcpath;
    }
    if ((code = gx_path_bbox(pgs->path, &bbox)) < 0)
        return code;
    gx_cpath_init_local(&rpath, pgs->memory);
    code = gx_cpath_from_rectangle(&rpath, &bbox);
    if (code >= 0)
        code = gx_cpath_clip(pgs, &rpath, pgs->path, rule);
    if (code < 0) {
        gx_cpath_free(&rpath, "gs_[eo]viewclip");
        return code;
    }
    rpath.rule = rule;
    gx_cpath_assign_free(pcpath, &rpath);
    gs_newpath(pgs);
    return 0;
}

int
gs_viewclippath(gs_state * pgs)
{
    gx_path cpath;
    gx_clip_path *pcpath = pgs->view_clip;
    int code;

    gx_path_init_local(&cpath, pgs->memory);
    if (pcpath == 0 || pcpath->rule == 0) {
        /* No view clip path is active: fabricate one. */
        gs_fixed_rect box;

        code = gx_default_clip_box(pgs, &box);
        if (code < 0)
            return code;
        code = gx_path_add_rectangle(&cpath, box.p.x, box.p.y,
                                     box.q.x, box.q.y);
    } else {
        code = gx_cpath_to_path(pcpath, &cpath);
    }
    if (code < 0)
        return code;
    return gx_path_assign_free(pgs->path, &cpath);
}