diff options
Diffstat (limited to 'src/emuWheel.c')
| -rw-r--r-- | src/emuWheel.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/emuWheel.c b/src/emuWheel.c index c0e92b1..04487cf 100644 --- a/src/emuWheel.c +++ b/src/emuWheel.c @@ -97,7 +97,6 @@ EvdevWheelEmuFilterMotion(InputInfoPtr pInfo, struct input_event *pEv) EvdevPtr pEvdev = (EvdevPtr)pInfo->private; WheelAxisPtr pAxis = NULL, pOtherAxis = NULL; int value = pEv->value; - int oldValue; /* Has wheel emulation been configured to be enabled? */ if (!pEvdev->emulateWheel.enabled) @@ -117,9 +116,13 @@ EvdevWheelEmuFilterMotion(InputInfoPtr pInfo, struct input_event *pEv) if(pEv->type == EV_ABS) { int axis = pEvdev->abs_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 */ + int oldValue; + + if (axis > -1 && valuator_mask_fetch(pEvdev->old_vals, axis, &oldValue)) { + valuator_mask_set(pEvdev->vals, axis, value); + value -= oldValue; /* make value into a differential measurement */ + } else + value = 0; /* avoid a jump on the first touch */ } switch(pEv->code) { |