forked from KolibriOS/kolibrios
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2002 University of Southern California
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* Copyright © 2005 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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*/
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#ifndef _CAIRO_SLOPE_PRIVATE_H
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#define _CAIRO_SLOPE_PRIVATE_H
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#include "cairo-types-private.h"
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#include "cairo-fixed-private.h"
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static inline void
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_cairo_slope_init (cairo_slope_t *slope,
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const cairo_point_t *a,
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const cairo_point_t *b)
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{
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slope->dx = b->x - a->x;
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slope->dy = b->y - a->y;
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}
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static inline cairo_bool_t
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_cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b)
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{
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return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx),
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_cairo_int32x32_64_mul (b->dy, a->dx));
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}
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static inline cairo_bool_t
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_cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b)
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{
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return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx),
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_cairo_int32x32_64_mul (a->dy, b->dy)));
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}
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cairo_private int
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_cairo_slope_compare (const cairo_slope_t *a,
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const cairo_slope_t *b) cairo_pure;
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#endif /* _CAIRO_SLOPE_PRIVATE_H */
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