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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. #ifndef U_RECT_H
  30. #define U_RECT_H
  31.  
  32. #include "pipe/p_compiler.h"
  33.  
  34. #ifdef __cplusplus
  35. extern "C" {
  36. #endif
  37.  
  38. struct u_rect {
  39.    int x0, x1;
  40.    int y0, y1;
  41. };
  42.  
  43. /* Do two rectangles intersect?
  44.  */
  45. static INLINE boolean
  46. u_rect_test_intersection(const struct u_rect *a,
  47.                          const struct u_rect *b)
  48. {
  49.    return (!(a->x1 < b->x0 ||
  50.              b->x1 < a->x0 ||
  51.              a->y1 < b->y0 ||
  52.              b->y1 < a->y0));
  53. }
  54.  
  55. /* Find the intersection of two rectangles known to intersect.
  56.  */
  57. static INLINE void
  58. u_rect_find_intersection(const struct u_rect *a,
  59.                          struct u_rect *b)
  60. {
  61.    /* Caller should verify intersection exists before calling.
  62.     */
  63.    if (b->x0 < a->x0) b->x0 = a->x0;
  64.    if (b->x1 > a->x1) b->x1 = a->x1;
  65.    if (b->y0 < a->y0) b->y0 = a->y0;
  66.    if (b->y1 > a->y1) b->y1 = a->y1;
  67. }
  68.  
  69.  
  70. static INLINE void
  71. u_rect_possible_intersection(const struct u_rect *a,
  72.                              struct u_rect *b)
  73. {
  74.    if (u_rect_test_intersection(a,b)) {
  75.       u_rect_find_intersection(a,b);
  76.    }
  77.    else {
  78.       b->x0 = b->x1 = b->y0 = b->y1 = 0;
  79.    }
  80. }
  81.  
  82. #ifdef __cplusplus
  83. }
  84. #endif
  85.  
  86.  
  87. /* Include pipe copy/fill rect helpers declarations for backwards compatibility
  88.  */
  89. #include "util/u_surface.h"
  90.  
  91.  
  92. #endif /* U_RECT_H */
  93.