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  1. /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
  2. /* cairo - a vector graphics library with display and print output
  3.  *
  4.  * Copyright © 2010 Andrea Canciani
  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.  * Contributor(s):
  32.  *      Andrea Canciani <ranma42@gmail.com>
  33.  */
  34.  
  35. #ifndef CAIRO_BOX_H
  36. #define CAIRO_BOX_H
  37.  
  38. #include "cairo-types-private.h"
  39. #include "cairo-compiler-private.h"
  40. #include "cairo-fixed-private.h"
  41.  
  42. static inline void
  43. _cairo_box_set (cairo_box_t *box,
  44.                 const cairo_point_t *p1,
  45.                 const cairo_point_t *p2)
  46. {
  47.     box->p1 = *p1;
  48.     box->p2 = *p2;
  49. }
  50.  
  51. static inline void
  52. _cairo_box_from_integers (cairo_box_t *box, int x, int y, int w, int h)
  53. {
  54.     box->p1.x = _cairo_fixed_from_int (x);
  55.     box->p1.y = _cairo_fixed_from_int (y);
  56.     box->p2.x = _cairo_fixed_from_int (x + w);
  57.     box->p2.y = _cairo_fixed_from_int (y + h);
  58. }
  59.  
  60. /* assumes box->p1 is top-left, p2 bottom-right */
  61. static inline void
  62. _cairo_box_add_point (cairo_box_t *box,
  63.                       const cairo_point_t *point)
  64. {
  65.     if (point->x < box->p1.x)
  66.         box->p1.x = point->x;
  67.     else if (point->x > box->p2.x)
  68.         box->p2.x = point->x;
  69.  
  70.     if (point->y < box->p1.y)
  71.         box->p1.y = point->y;
  72.     else if (point->y > box->p2.y)
  73.         box->p2.y = point->y;
  74. }
  75.  
  76. static inline void
  77. _cairo_box_add_box (cairo_box_t *box,
  78.                     const cairo_box_t *add)
  79. {
  80.     if (add->p1.x < box->p1.x)
  81.         box->p1.x = add->p1.x;
  82.     if (add->p2.x > box->p2.x)
  83.         box->p2.x = add->p2.x;
  84.  
  85.     if (add->p1.y < box->p1.y)
  86.         box->p1.y = add->p1.y;
  87.     if (add->p2.y > box->p2.y)
  88.         box->p2.y = add->p2.y;
  89. }
  90.  
  91. /* assumes box->p1 is top-left, p2 bottom-right */
  92. static inline cairo_bool_t
  93. _cairo_box_contains_point (const cairo_box_t *box,
  94.                            const cairo_point_t *point)
  95. {
  96.     return box->p1.x <= point->x  && point->x <= box->p2.x &&
  97.         box->p1.y <= point->y  && point->y <= box->p2.y;
  98. }
  99.  
  100. static inline cairo_bool_t
  101. _cairo_box_is_pixel_aligned (const cairo_box_t *box)
  102. {
  103. #if CAIRO_FIXED_FRAC_BITS <= 8 && 0
  104.     return ((box->p1.x & CAIRO_FIXED_FRAC_MASK) << 24 |
  105.             (box->p1.y & CAIRO_FIXED_FRAC_MASK) << 16 |
  106.             (box->p2.x & CAIRO_FIXED_FRAC_MASK) << 8 |
  107.             (box->p2.y & CAIRO_FIXED_FRAC_MASK) << 0) == 0;
  108. #else /* GCC on i7 prefers this variant (bizarrely according to the profiler) */
  109.     cairo_fixed_t f;
  110.  
  111.     f = 0;
  112.     f |= box->p1.x & CAIRO_FIXED_FRAC_MASK;
  113.     f |= box->p1.y & CAIRO_FIXED_FRAC_MASK;
  114.     f |= box->p2.x & CAIRO_FIXED_FRAC_MASK;
  115.     f |= box->p2.y & CAIRO_FIXED_FRAC_MASK;
  116.  
  117.     return f == 0;
  118. #endif
  119. }
  120.  
  121. #endif /* CAIRO_BOX_H */
  122.