workbench/libs/mesa/src/gallium/auxiliary/util/u_rect.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
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  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.
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  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.
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  26  **************************************************************************/
  27
  28
  29 #ifndef U_RECT_H
  30 #define U_RECT_H
  31
  32 #include "pipe/p_compiler.h"
  33
  34 struct u_rect {
  35    int x0, x1;
  36    int y0, y1;
  37 };
  38
  39 /* Do two rectangles intersect?
  40  */
  41 static INLINE boolean
  42 u_rect_test_intersection(const struct u_rect *a,
  43                          const struct u_rect *b)
  44 {
  45    return (!(a->x1 < b->x0 ||
  46              b->x1 < a->x0 ||
  47              a->y1 < b->y0 ||
  48              b->y1 < a->y0));
  49 }
  50
  51 /* Find the intersection of two rectangles known to intersect.
  52  */
  53 static INLINE void
  54 u_rect_find_intersection(const struct u_rect *a,
  55                          struct u_rect *b)
  56 {
  57    /* Caller should verify intersection exists before calling.
  58     */
  59    if (b->x0 < a->x0) b->x0 = a->x0;
  60    if (b->x1 > a->x1) b->x1 = a->x1;
  61    if (b->y0 < a->y0) b->y0 = a->y0;
  62    if (b->y1 > a->y1) b->y1 = a->y1;
  63 }
  64
  65
  66 static INLINE void
  67 u_rect_possible_intersection(const struct u_rect *a,
  68                              struct u_rect *b)
  69 {
  70    if (u_rect_test_intersection(a,b)) {
  71       u_rect_find_intersection(a,b);
  72    }
  73    else {
  74       b->x0 = b->x1 = b->y0 = b->y1 = 0;
  75    }
  76 }
  77
  78 #include "pipe/p_format.h"
  79 #include "util/u_pack_color.h"
  80
  81
  82
  83 /**********************************************************************
  84  * Pipe copy/fill rect helpers.
  85  */
  86
  87 /* These really should move to a different file:
  88  */
  89 #include "pipe/p_format.h"
  90
  91 extern void
  92 util_copy_rect(ubyte * dst, enum pipe_format format,
  93                unsigned dst_stride, unsigned dst_x, unsigned dst_y,
  94                unsigned width, unsigned height, const ubyte * src,
  95                int src_stride, unsigned src_x, unsigned src_y);
  96
  97 extern void
  98 util_fill_rect(ubyte * dst, enum pipe_format format,
  99                unsigned dst_stride, unsigned dst_x, unsigned dst_y,
 100                unsigned width, unsigned height, union util_color *uc);
 101
 102
 103 #endif /* U_RECT_H */