Line data    Source code

       1             : /* cairo - a vector graphics library with display and print output
       2             :  *
       3             :  * Copyright © 2002 University of Southern California
       4             :  * Copyright © 2005 Red Hat, Inc.
       5             :  *
       6             :  * This library is free software; you can redistribute it and/or
       7             :  * modify it either under the terms of the GNU Lesser General Public
       8             :  * License version 2.1 as published by the Free Software Foundation
       9             :  * (the "LGPL") or, at your option, under the terms of the Mozilla
      10             :  * Public License Version 1.1 (the "MPL"). If you do not alter this
      11             :  * notice, a recipient may use your version of this file under either
      12             :  * the MPL or the LGPL.
      13             :  *
      14             :  * You should have received a copy of the LGPL along with this library
      15             :  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
      17             :  * You should have received a copy of the MPL along with this library
      18             :  * in the file COPYING-MPL-1.1
      19             :  *
      20             :  * The contents of this file are subject to the Mozilla Public License
      21             :  * Version 1.1 (the "License"); you may not use this file except in
      22             :  * compliance with the License. You may obtain a copy of the License at
      23             :  * http://www.mozilla.org/MPL/
      24             :  *
      25             :  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
      26             :  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
      27             :  * the specific language governing rights and limitations.
      28             :  *
      29             :  * The Original Code is the cairo graphics library.
      30             :  *
      31             :  * The Initial Developer of the Original Code is University of Southern
      32             :  * California.
      33             :  *
      34             :  * Contributor(s):
      35             :  *      Carl D. Worth <cworth@cworth.org>
      36             :  */
      37             : 
      38             : #ifndef _CAIRO_SLOPE_PRIVATE_H
      39             : #define _CAIRO_SLOPE_PRIVATE_H
      40             : 
      41             : #include "cairo-types-private.h"
      42             : #include "cairo-fixed-private.h"
      43             : 
      44             : static inline void
      45           0 : _cairo_slope_init (cairo_slope_t *slope,
      46             :                    const cairo_point_t *a,
      47             :                    const cairo_point_t *b)
      48             : {
      49           0 :     slope->dx = b->x - a->x;
      50           0 :     slope->dy = b->y - a->y;
      51           0 : }
      52             : 
      53             : static inline cairo_bool_t
      54           0 : _cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b)
      55             : {
      56           0 :     return _cairo_int64_eq (_cairo_int32x32_64_mul (a->dy, b->dx),
      57             :                             _cairo_int32x32_64_mul (b->dy, a->dx));
      58             : }
      59             : 
      60             : static inline cairo_bool_t
      61           0 : _cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b)
      62             : {
      63           0 :     return _cairo_int64_negative (_cairo_int64_add (_cairo_int32x32_64_mul (a->dx, b->dx),
      64             :                                                     _cairo_int32x32_64_mul (a->dy, b->dy)));
      65             : }
      66             : 
      67             : cairo_private int
      68             : _cairo_slope_compare (const cairo_slope_t *a,
      69             :                       const cairo_slope_t *b) cairo_pure;
      70             : 
      71             : 
      72             : #endif /* _CAIRO_SLOPE_PRIVATE_H */