From d940ccb5cd45ea8bfd8ee928d7172c39f6ae20a2 Mon Sep 17 00:00:00 2001
From: Rainer Rillke <rillke@wikipedia.de>
Date: Tue, 27 Jun 2023 19:29:10 +0200
Subject: [PATCH] Catch Warning when creating PNG

---
 classes/class.assPaintQuestionGUI.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/classes/class.assPaintQuestionGUI.php b/classes/class.assPaintQuestionGUI.php
index ea13725..a923438 100755
--- a/classes/class.assPaintQuestionGUI.php
+++ b/classes/class.assPaintQuestionGUI.php
@@ -497,7 +497,11 @@ function getSolutionOutput(
 					$background = imagecreatefromjpeg ($pathToImage);
 					break;
 				case 3:
+					set_error_handler(function ($errno, $errstr) {
+						ilLoggerFactory::getLogger('assPaintQuestion')->warning("Error $errno in Paint Question: $errstr");
+					}, E_WARNING);
 					$backgroundInput = imagecreatefrompng ($pathToImage);
+					restore_error_handler();
 					// Steps to convert transparency to white (instead of default black)
 					$backgroundWidth = imagesx($backgroundInput);
 					$backgroundHeight = imagesy($backgroundInput);