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/* 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
*
* 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 */