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Xext: fix up wrong conditions for negative sync transitions.

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If the counter had a value higher than the trigger value for a negative
transition, the trigger value did not get set.

The correct sequence of checks is:
if (positive transition)
   if (counter value < trigger value)
      set up trigger
if (negative transition)
   if (counter value > trigger value)
      set up trigger

Red Hat Bug 501601 <https://bugzilla.redhat.com/show_bug.cgi?id=501601>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2009-08-13 16:37:00 +10:00
parent a3e50b0574
commit db568f9eab
1 changed files with 15 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
Xext/sync.c
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@ -962,28 +962,24 @@ SyncComputeBracketValues(SyncCounter *pCounter, Bool startOver)
pnewltval = &psci->bracket_less;
}
}
else if ( (pTrigger->test_type == XSyncPositiveTransition &&
else if (pTrigger->test_type == XSyncNegativeTransition &&
ct != XSyncCounterNeverIncreases)
||
(pTrigger->test_type == XSyncNegativeTransition &&
ct != XSyncCounterNeverDecreases)
)
{
if (XSyncValueLessThan(pCounter->value, pTrigger->test_value))
if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) &&
XSyncValueGreaterThan(pTrigger->test_value, psci->bracket_less))
{
if (XSyncValueLessThan(pTrigger->test_value,
psci->bracket_greater))
{
psci->bracket_greater = pTrigger->test_value;
pnewgtval = &psci->bracket_greater;
}
else
if (XSyncValueGreaterThan(pTrigger->test_value,
psci->bracket_less))
{
psci->bracket_less = pTrigger->test_value;
pnewltval = &psci->bracket_less;
}
psci->bracket_less = pTrigger->test_value;
pnewltval = &psci->bracket_less;
}
}
else if (pTrigger->test_type == XSyncPositiveTransition &&
ct != XSyncCounterNeverDecreases)
{
if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) &&
XSyncValueLessThan(pTrigger->test_value, psci->bracket_greater))
{
psci->bracket_greater = pTrigger->test_value;
pnewgtval = &psci->bracket_greater;
}
}
} /* end for each trigger */