/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */

/* cairo - a vector graphics library with display and print output

 *

 * Copyright © 2002 University of Southern California

 * Copyright © 2005 Red Hat, Inc.

 * Copyright © 2009 Chris Wilson

 *

 * This library is free software; you can redistribute it and/or

 * modify it either under the terms of the GNU Lesser General Public

 * License version 2.1 as published by the Free Software Foundation

 * (the "LGPL") or, at your option, under the terms of the Mozilla

 * Public License Version 1.1 (the "MPL"). If you do not alter this

 * notice, a recipient may use your version of this file under either

 * the MPL or the LGPL.

 *

 * You should have received a copy of the LGPL along with this library

 * in the file COPYING-LGPL-2.1; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA

 * You should have received a copy of the MPL along with this library

 * in the file COPYING-MPL-1.1

 *

 * The contents of this file are subject to the Mozilla Public License

 * Version 1.1 (the "License"); you may not use this file except in

 * compliance with the License. You may obtain a copy of the License at

 * http://www.mozilla.org/MPL/

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY

 * OF ANY KIND, either express or implied. See the LGPL or the MPL for

 * the specific language governing rights and limitations.

 *

 * The Original Code is the cairo graphics library.

 *

 * The Initial Developer of the Original Code is University of Southern

 * California.

 *

 * Contributor(s):

 *  Carl D. Worth <cworth@cworth.org>

 *  Kristian Høgsberg <krh@redhat.com>

 *  Chris Wilson <chris@chris-wilson.co.uk>

 */

#include "cairoint.h"

#include "cairo-clip-private.h"

#include "cairo-error-private.h"

#include "cairo-freed-pool-private.h"

#include "cairo-gstate-private.h"

#include "cairo-path-fixed-private.h"

#include "cairo-pattern-private.h"

#include "cairo-composite-rectangles-private.h"

#include "cairo-region-private.h"

static void

_cairo_clip_extract_region (cairo_clip_t *clip)

{

    cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];

    cairo_rectangle_int_t *r = stack_rects;

    cairo_bool_t is_region;

    int i;

    if (clip->num_boxes == 0)

  return;

    if (clip->num_boxes > ARRAY_LENGTH (stack_rects)) {

  r = _cairo_malloc_ab (clip->num_boxes, sizeof (cairo_rectangle_int_t));

  if (r == NULL){

      _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);

      return;

  }

    }

    is_region = clip->path == NULL;

    for (i = 0; i < clip->num_boxes; i++) {

  cairo_box_t *b = &clip->boxes[i];

  if (is_region)

      is_region =

    _cairo_fixed_is_integer (b->p1.x | b->p1.y |  b->p2.x | b->p2.y);

  r[i].x = _cairo_fixed_integer_floor (b->p1.x);

  r[i].y = _cairo_fixed_integer_floor (b->p1.y);

  r[i].width  = _cairo_fixed_integer_ceil (b->p2.x) - r[i].x;

  r[i].height = _cairo_fixed_integer_ceil (b->p2.y) - r[i].y;

    }

    clip->is_region = is_region;

    clip->region = cairo_region_create_rectangles (r, i);

    if (r != stack_rects)

  free (r);

}

cairo_region_t *

_cairo_clip_get_region (const cairo_clip_t *clip)

{

    if (clip == NULL)

  return NULL;

    if (clip->region == NULL)

  _cairo_clip_extract_region ((cairo_clip_t *) clip);

    return clip->region;

}

cairo_bool_t

_cairo_clip_is_region (const cairo_clip_t *clip)

{

    if (clip == NULL)

  return TRUE;

    if (clip->is_region)

  return TRUE;

    /* XXX Geometric reduction? */

    if (clip->path)

  return FALSE;

    if (clip->num_boxes == 0)

  return TRUE;

    if (clip->region == NULL)

  _cairo_clip_extract_region ((cairo_clip_t *) clip);

    return clip->is_region;

}