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overlay: Negative modulus

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Don't use a negative index into the array if the desired element is
negative, just wrap around properly into the ring for the chart.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-12-21 13:49:25 +00:00
parent c537cdb08e
commit 7f9d14aa51
1 changed files with 5 additions and 1 deletions
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overlay/chart.c
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@ -143,7 +143,11 @@ static double value_at(struct chart *chart, int n)
else if (n >= chart->current_sample) else if (n >= chart->current_sample)
n = chart->current_sample - 1; n = chart->current_sample - 1;
return chart->samples[n % chart->num_samples]; n %= chart->num_samples;
if (n < 0)
n += chart->num_samples;
return chart->samples[n];
} }
static double gradient_at(struct chart *chart, int n) static double gradient_at(struct chart *chart, int n)