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  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. _cairo_slope_init (cairo_slope_t *slope,
  46.                    const cairo_point_t *a,
  47.                    const cairo_point_t *b)
  48. {
  49.     slope->dx = b->x - a->x;
  50.     slope->dy = b->y - a->y;
  51. }
  52.  
  53. static inline cairo_bool_t
  54. _cairo_slope_equal (const cairo_slope_t *a, const cairo_slope_t *b)
  55. {
  56.     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. _cairo_slope_backwards (const cairo_slope_t *a, const cairo_slope_t *b)
  62. {
  63.     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 */
  73.