From 92d39a1aed41499e4ad9b45d0d5df67857280950 Mon Sep 17 00:00:00 2001
From: Thomas Holder <thomas@thomas-holder.de>
Date: Wed, 31 Jan 2024 03:48:49 +0100
Subject: [PATCH] Fix for broken `png_check_sig` in libpng 1.6.41 (#332)

See https://github.com/pnggroup/libpng/issues/534

The bug report says that `png_check_sig` was deprecated many years ago.
---
 layer0/MyPNG.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/layer0/MyPNG.cpp b/layer0/MyPNG.cpp
index 65c36a1cc..69331c77e 100644
--- a/layer0/MyPNG.cpp
+++ b/layer0/MyPNG.cpp
@@ -407,7 +407,7 @@ std::unique_ptr<pymol::Image> MyPNGRead(const char *file_name)
   }
 
   if(ok) {
-    ret = png_check_sig(buf, 8);
+    ret = !png_sig_cmp(buf, 0, 8);
     if(!ret)
       ok = false;
   }