Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net> --- dix/ptrveloc.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/dix/ptrveloc.c b/dix/ptrveloc.c index fafbbb0..d37d1d9 100644 --- a/dix/ptrveloc.c +++ b/dix/ptrveloc.c @@ -506,7 +506,13 @@ DoGetDirection(int dx, int dy){ #define DIRECTION_CACHE_RANGE 5 #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 GetDirection(int dx, int dy){ static int cache[DIRECTION_CACHE_SIZE][DIRECTION_CACHE_SIZE]; -- 1.7.4.4 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel