1 /* cairo - a vector graphics library with display and print output
2 *
3 * Copyright © 2002 University of Southern California
4 * Copyright © 2005 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it either under the terms of the GNU Lesser General Public
8 * License version 2.1 as published by the Free Software Foundation
9 * (the "LGPL") or, at your option, under the terms of the Mozilla
10 * Public License Version 1.1 (the "MPL"). If you do not alter this
11 * notice, a recipient may use your version of this file under either
12 * the MPL or the LGPL.
13 *
14 * You should have received a copy of the LGPL along with this library
15 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
17 * You should have received a copy of the MPL along with this library
18 * in the file COPYING-MPL-1.1
19 *
20 * The contents of this file are subject to the Mozilla Public License
21 * Version 1.1 (the "License"); you may not use this file except in
22 * compliance with the License. You may obtain a copy of the License at
23 * http://www.mozilla.org/MPL/
24 *
25 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
26 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
27 * the specific language governing rights and limitations.
28 *
29 * The Original Code is the cairo graphics library.
30 *
31 * The Initial Developer of the Original Code is University of Southern
32 * California.
33 *
34 * Contributor(s):
35 * Carl D. Worth <cworth@cworth.org>
36 */
37
38 #ifndef _CAIRO_SLOPE_PRIVATE_H
39 #define _CAIRO_SLOPE_PRIVATE_H
40
41 #include "cairo-types-private.h"
42 #include "cairo-fixed-private.h"
43
44 static inline void
_cairo_slope_init(cairo_slope_t * slope,const cairo_point_t * a,const cairo_point_t * b)45 _cairo_slope_init (cairo_slope_t *slope,
46 const cairo_point_t *a,
47 const cairo_point_t *b)
48 {
49 slope->dx = b->x - a->x;
50 slope->dy = b->y - a->y;
51 }
52
53 static inline cairo_bool_t
_cairo_slope_equal(const cairo_slope_t * a,const cairo_slope_t * b)54 _cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b)
55 {
56 return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx),
57 _cairo_int32x32_64_mul (b->dy, a->dx));
58 }
59
60 static inline cairo_bool_t
_cairo_slope_backwards(const cairo_slope_t * a,const cairo_slope_t * b)61 _cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b)
62 {
63 return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx),
64 _cairo_int32x32_64_mul (a->dy, b->dy)));
65 }
66
67 cairo_private int
68 _cairo_slope_compare (const cairo_slope_t *a,
69 const cairo_slope_t *b) cairo_pure;
70
71
72 #endif /* _CAIRO_SLOPE_PRIVATE_H */
73