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Ensure delta computation does not go crazy

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I have seen this a couple times, but I haven't been able to catch it
when it starts. It's a feedback loop, so once you miss the entrance of
the loop, you can't see what really went wrong.

This patch papers over the issue for now.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Chase Douglas
2012-02-02 13:19:15 -08:00
committed by Peter Hutterer
parent 782c7fb6fe
commit dfdcf8b343
1 changed files with 8 additions and 0 deletions
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8
src/synaptics.c
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@@ -1974,6 +1974,14 @@ get_delta(SynapticsPrivate *priv, const struct SynapticsHwState *hw,
/* report edge speed as synthetic motion. Of course, it would be
* cooler to report floats than to buffer, but anyway. */
/* FIXME: When these values go NaN, bad things happen. Root cause is unknown
* thus far though. */
if (isnan(priv->frac_x))
priv->frac_x = 0;
if (isnan(priv->frac_y))
priv->frac_y = 0;
tmpf = *dx + x_edge_speed * dtime + priv->frac_x;
priv->frac_x = modf(tmpf, &integral);
*dx = integral;