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--- libmng_filter.c 2012-07-29 15:26:34.000000000 -0400
+++ libmng_filter.c 2024-01-08 14:25:01.379756000 -0500
@@ -207,7 +207,7 @@
iC = (mng_uint32)*pPriorx_prev;
iP = iA + iB - iC;
- iPa = abs (iP - iA);
- iPb = abs (iP - iB);
- iPc = abs (iP - iC);
+ iPa = iP > iA ? iP - iA : iA - iP;
+ iPb = iP > iB ? iP - iB : iB - iP;
+ iPc = iP > iC ? iP - iC : iC - iP;
if ((iPa <= iPb) && (iPa <= iPc))
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