libtiff: Merge branch 'tif_luv_check_NaN_fix_#530' into 'master'

SDL Commits
1 
From b0e1c25dd1d065200c8d8f59ad0afe014861a1b9 Mon Sep 17 00:00:00 2001
From: Su_Laus <[EMAIL REDACTED]>
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
---
 libtiff/tif_luv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libtiff/tif_luv.c b/libtiff/tif_luv.c
index 051721e8..021756d5 100644
--- a/libtiff/tif_luv.c
+++ b/libtiff/tif_luv.c
@@ -953,6 +953,13 @@ static
 {
     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);