From: Egbert Eich <e...@suse.com>
If minPressure == wcmMaxZ then the range left to scale is 0. Catch
this condition and act appropriately.
Signed-off-by: Egbert Eich <e...@suse.com>
---
src/wcmCommon.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/src/wcmCommon.c b/src/wcmCommon.c
index ec7ea7e..0ea7be8 100644
--- a/src/wcmCommon.c
+++ b/src/wcmCommon.c
@@ -1071,6 +1071,7 @@ normalizePressure(const WacomDevicePtr priv, const
WacomDeviceState *ds)
WacomCommonPtr common = priv->common;
double pressure;
int p = ds->pressure;
+ int range_left;
if (p < priv->minPressure)
{
@@ -1081,10 +1082,14 @@ normalizePressure(const WacomDevicePtr priv, const
WacomDeviceState *ds)
}
/* normalize pressure to 0..FILTER_PRESSURE_RES */
- pressure = xf86ScaleAxis(p - priv->minPressure,
- FILTER_PRESSURE_RES, 0,
- common->wcmMaxZ - priv->minPressure,
- 0);
+ range_left = common->wcmMaxZ - priv->minPressure;
+ if (range_left >= 1)
+ pressure = xf86ScaleAxis(p - priv->minPressure,
+ FILTER_PRESSURE_RES, 0,
+ range_left,
+ 0);
+ else
+ pressure = FILTER_PRESSURE_RES;
return (int)pressure;
}
--
1.8.1.4
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