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-rw-r--r--src/emuWheel.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/emuWheel.c b/src/emuWheel.c
index 81ef2a3..715f8d1 100644
--- a/src/emuWheel.c
+++ b/src/emuWheel.c
@@ -118,8 +118,9 @@ EvdevWheelEmuFilterMotion(InputInfoPtr pInfo, struct input_event *pEv)
/* We don't want to intercept real mouse wheel events */
if(pEv->type == EV_ABS) {
- oldValue = pEvdev->vals[pEvdev->axis_map[pEv->code]];
- pEvdev->vals[pEvdev->axis_map[pEv->code]] = value;
+ int axis = pEvdev->axis_map[pEv->code];
+ oldValue = valuator_mask_get(pEvdev->vals, axis);
+ valuator_mask_set(pEvdev->vals, axis, value);
value -= oldValue; /* make value into a differential measurement */
}