| /* 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 */ |