0,0 → 1,72 |
/* cairo - a vector graphics library with display and print output |
* |
* Copyright © 2002 University of Southern California |
* Copyright © 2005 Red Hat, Inc. |
* |
* 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> |
*/ |
|
#ifndef _CAIRO_SLOPE_PRIVATE_H |
#define _CAIRO_SLOPE_PRIVATE_H |
|
#include "cairo-types-private.h" |
#include "cairo-fixed-private.h" |
|
static inline void |
_cairo_slope_init (cairo_slope_t *slope, |
const cairo_point_t *a, |
const cairo_point_t *b) |
{ |
slope->dx = b->x - a->x; |
slope->dy = b->y - a->y; |
} |
|
static inline cairo_bool_t |
_cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b) |
{ |
return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx), |
_cairo_int32x32_64_mul (b->dy, a->dx)); |
} |
|
static inline cairo_bool_t |
_cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b) |
{ |
return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx), |
_cairo_int32x32_64_mul (a->dy, b->dy))); |
} |
|
cairo_private int |
_cairo_slope_compare (const cairo_slope_t *a, |
const cairo_slope_t *b) cairo_pure; |
|
|
#endif /* _CAIRO_SLOPE_PRIVATE_H */ |