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-rw-r--r--layout/base/nsLayoutUtils.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index 63253fd10..0a82dbf6a 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -1439,13 +1439,14 @@ public:
/**
* This function increases an initial intrinsic size, 'aCurrent', according
* to the given 'aPercent', such that the size-increase makes up exactly
- * 'aPercent' percent of the returned value. If 'aPercent' is less than
- * or equal to zero the original 'aCurrent' value is returned. If 'aPercent'
- * is greater than or equal to 1.0 the value nscoord_MAX is returned.
+ * 'aPercent' percent of the returned value. If 'aPercent' or 'aCurrent' are
+ * less than or equal to zero the original 'aCurrent' value is returned.
+ * If 'aPercent' is greater than or equal to 1.0 the value nscoord_MAX is
+ * returned.
*/
static nscoord AddPercents(nscoord aCurrent, float aPercent)
{
- if (aPercent > 0.0f) {
+ if (aPercent > 0.0f && aCurrent > 0) {
return MOZ_UNLIKELY(aPercent >= 1.0f) ? nscoord_MAX
: NSToCoordRound(float(aCurrent) / (1.0f - aPercent));
}