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| Rev | Author | Line No. | Line |
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| 1892 | serge | 1 | /* cairo - a vector graphics library with display and print output |
| 2 | * |
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| 3 | * Copyright © 2002 University of Southern California |
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| 4 | * Copyright © 2005 Red Hat, Inc. |
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| 5 | * |
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| 6 | * This library is free software; you can redistribute it and/or |
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| 7 | * modify it either under the terms of the GNU Lesser General Public |
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| 8 | * License version 2.1 as published by the Free Software Foundation |
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| 9 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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| 10 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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| 11 | * notice, a recipient may use your version of this file under either |
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| 12 | * the MPL or the LGPL. |
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| 13 | * |
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| 14 | * You should have received a copy of the LGPL along with this library |
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| 15 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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| 16 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
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| 17 | * You should have received a copy of the MPL along with this library |
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| 18 | * in the file COPYING-MPL-1.1 |
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| 19 | * |
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| 20 | * The contents of this file are subject to the Mozilla Public License |
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| 21 | * Version 1.1 (the "License"); you may not use this file except in |
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| 22 | * compliance with the License. You may obtain a copy of the License at |
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| 23 | * http://www.mozilla.org/MPL/ |
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| 24 | * |
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| 25 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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| 26 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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| 27 | * the specific language governing rights and limitations. |
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| 28 | * |
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| 29 | * The Original Code is the cairo graphics library. |
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| 30 | * |
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| 31 | * The Initial Developer of the Original Code is University of Southern |
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| 32 | * California. |
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| 33 | * |
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| 34 | * Contributor(s): |
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| 35 | * Carl D. Worth |
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| 36 | */ |
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| 37 | |||
| 38 | #ifndef _CAIRO_SLOPE_PRIVATE_H |
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| 39 | #define _CAIRO_SLOPE_PRIVATE_H |
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| 40 | |||
| 41 | #include "cairo-types-private.h" |
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| 42 | #include "cairo-fixed-private.h" |
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| 43 | |||
| 44 | static inline void |
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| 45 | _cairo_slope_init (cairo_slope_t *slope, |
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| 46 | const cairo_point_t *a, |
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| 47 | const cairo_point_t *b) |
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| 48 | { |
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| 49 | slope->dx = b->x - a->x; |
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| 50 | slope->dy = b->y - a->y; |
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| 51 | } |
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| 52 | |||
| 53 | static inline cairo_bool_t |
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| 54 | _cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b) |
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| 55 | { |
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| 56 | return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx), |
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| 57 | _cairo_int32x32_64_mul (b->dy, a->dx)); |
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| 58 | } |
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| 59 | |||
| 60 | static inline cairo_bool_t |
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| 61 | _cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b) |
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| 62 | { |
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| 63 | return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx), |
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| 64 | _cairo_int32x32_64_mul (a->dy, b->dy))); |
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| 65 | } |
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| 66 | |||
| 67 | cairo_private int |
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| 68 | _cairo_slope_compare (const cairo_slope_t *a, |
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| 69 | const cairo_slope_t *b) cairo_pure; |
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| 70 | |||
| 71 | |||
| 72 | #endif /* _CAIRO_SLOPE_PRIVATE_H */ |