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/**************************************************************************
*
* Copyright 2008 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef U_RECT_H
#define U_RECT_H
#include "pipe/p_compiler.h"
#include "util/u_math.h"
#ifdef __cplusplus
extern "C" {
#endif
struct u_rect {
int x0, x1;
int y0, y1;
};
/* Do two rectangles intersect?
* Note: empty rectangles are valid as inputs (and never intersect).
*/
static inline boolean
u_rect_test_intersection(const struct u_rect *a,
const struct u_rect *b)
{
return (!(a->x1 < b->x0 ||
b->x1 < a->x0 ||
a->y1 < b->y0 ||
b->y1 < a->y0 ||
a->x1 < a->x0 ||
a->y1 < a->y0 ||
b->x1 < b->x0 ||
b->y1 < b->y0));
}
/* Find the intersection of two rectangles known to intersect.
*/
static inline void
u_rect_find_intersection(const struct u_rect *a,
struct u_rect *b)
{
/* Caller should verify intersection exists before calling.
*/
if (b->x0 < a->x0) b->x0 = a->x0;
if (b->x1 > a->x1) b->x1 = a->x1;
if (b->y0 < a->y0) b->y0 = a->y0;
if (b->y1 > a->y1) b->y1 = a->y1;
}
static inline int
u_rect_area(const struct u_rect *r)
{
return (r->x1 - r->x0) * (r->y1 - r->y0);
}
static inline void
u_rect_possible_intersection(const struct u_rect *a,
struct u_rect *b)
{
if (u_rect_test_intersection(a,b)) {
u_rect_find_intersection(a,b);
}
else {
/*
* Note the u_rect_xx tests deal with inclusive coordinates
* hence all-zero would not be an empty box.
*/
b->x0 = b->y0 = 0;
b->x1 = b->y1 = -1;
}
}
/* Set @d to a rectangle that covers both @a and @b.
*/
static inline void
u_rect_union(struct u_rect *d, const struct u_rect *a, const struct u_rect *b)
{
d->x0 = MIN2(a->x0, b->x0);
d->y0 = MIN2(a->y0, b->y0);
d->x1 = MAX2(a->x1, b->x1);
d->y1 = MAX2(a->y1, b->y1);
}
#ifdef __cplusplus
}
#endif
#endif /* U_RECT_H */
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