frederik
/
xserver
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dix: document GetDirection 

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Simon Thum <simon.thum@gmx.de>
This commit is contained in:
Peter Hutterer 2011-04-20 13:12:35 +10:00
parent df90db892d
commit afaa178125
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
dix/ptrveloc.c
View File

@ -506,7 +506,13 @@ DoGetDirection(int dx, int dy){
#define DIRECTION_CACHE_RANGE 5 #define DIRECTION_CACHE_RANGE 5
#define DIRECTION_CACHE_SIZE (DIRECTION_CACHE_RANGE*2+1) #define DIRECTION_CACHE_SIZE (DIRECTION_CACHE_RANGE*2+1)
/* cache DoGetDirection(). */ /* cache DoGetDirection().
* To avoid excessive use of direction calculation, cache the values for
* [-5..5] for both x/y. Anything outside of that is calcualted on the fly.
*
* @return A bitmask for N, NE, S, SE, etc. indicating the directions for
* this movement.
*/
static int static int
GetDirection(int dx, int dy){ GetDirection(int dx, int dy){
static int cache[DIRECTION_CACHE_SIZE][DIRECTION_CACHE_SIZE]; static int cache[DIRECTION_CACHE_SIZE][DIRECTION_CACHE_SIZE];