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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 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 */
    104