From 2b4bcc1e5f7284111ef37276c973fec40948b4cd Mon Sep 17 00:00:00 2001
From: Jonathan Thomas <jonathan@openshot.org>
Date: Fri, 18 Nov 2022 00:55:16 -0600
Subject: [PATCH] Prevent divide by zero error

---
 src/effects/Mask.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/effects/Mask.cpp b/src/effects/Mask.cpp
index 8cd71cee..442b2307 100644
--- a/src/effects/Mask.cpp
+++ b/src/effects/Mask.cpp
@@ -114,7 +114,7 @@ std::shared_ptr<openshot::Frame> Mask::GetFrame(std::shared_ptr<openshot::Frame>
 		gray_value += (255 * brightness_value);
 
 		// Adjust the contrast
-		float factor = (20 / (20 - contrast_value));
+		float factor = (20 / std::fmax(0.00001, 20.0 - contrast_value));
 		gray_value = (factor * (gray_value - 128) + 128);
 
 		// Calculate the % change in alpha