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Added xor_region, fixed rect_in_region.

This commit is contained in:
Alexandre Julliard 2004-09-08 01:34:22 +00:00
parent 02236f06a8
commit 5e128dd470
2 changed files with 22 additions and 3 deletions
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23
server/region.c
View File

@ -76,6 +76,7 @@ SOFTWARE.
#include <stdlib.h>
#include <string.h>
#include "request.h"
#include "user.h"
struct region
{
@ -759,6 +760,23 @@ struct region *union_region( struct region *dst, const struct region *src1,
return dst;
}
/* compute the exclusive or of two regions into dst, which can be one of the source regions */
struct region *xor_region( struct region *dst, const struct region *src1,
const struct region *src2 )
{
struct region *tmp = create_empty_region();
if (!tmp) return NULL;
if (!subtract_region( tmp, src1, src2 ) ||
!subtract_region( dst, src2, src1 ) ||
!union_region( dst, dst, tmp ))
dst = NULL;
free_region( tmp );
return dst;
}
/* check if the given point is inside the region */
int point_in_region( struct region *region, int x, int y )
{
@ -783,10 +801,9 @@ int rect_in_region( struct region *region, const rectangle_t *rect )
for (ptr = region->rects, end = region->rects + region->num_rects; ptr < end; ptr++)
{
if (ptr->top > rect->bottom) return 0;
if (ptr->top >= rect->bottom) return 0;
if (ptr->bottom <= rect->top) continue;
/* now we are in the correct band */
if (ptr->left > rect->right) return 0;
if (ptr->left >= rect->right) continue;
if (ptr->right <= rect->left) continue;
return 1;
}

2
server/user.h
View File

@ -83,6 +83,8 @@ extern struct region *subtract_region( struct region *dst, const struct region *
const struct region *src2 );
extern struct region *union_region( struct region *dst, const struct region *src1,
const struct region *src2 );
extern struct region *xor_region( struct region *dst, const struct region *src1,
const struct region *src2 );
extern int point_in_region( struct region *region, int x, int y );
extern int rect_in_region( struct region *region, const rectangle_t *rect );
static inline struct region *create_empty_region(void) { return create_region( NULL, 0 ); }