From b0e1c25dd1d065200c8d8f59ad0afe014861a1b9 Mon Sep 17 00:00:00 2001
From: Su_Laus <sulau@freenet.de>
Date: Thu, 16 Feb 2023 12:03:16 +0100
Subject: [PATCH] tif_luv: Check and correct for NaN data in uv_encode().

Closes #530

See merge request !473

Reference:https://gitlab.com/libtiff/libtiff/-/merge_requests/473/diffs
Conflict:Adaptation Context

---
 libtiff/tif_luv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libtiff/tif_luv.c b/libtiff/tif_luv.c
index 13765ea..e511a46 100644
--- a/libtiff/tif_luv.c
+++ b/libtiff/tif_luv.c
@@ -908,6 +908,13 @@ uv_encode(double u, double v, int em)	/* encode (u',v') coordinates */
 {
 	register int	vi, ui;
 
+	/* check for NaN */
+	if (u != u || v != v)
+	{
+		u = U_NEU;
+		v = V_NEU;
+	}
+
 	if (v < UV_VSTART)
 		return oog_encode(u, v);
 	vi = tiff_itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
-- 
2.27.0

