From 2caec59a52c21a62d4edd29d19ef1053d549a524 Mon Sep 17 00:00:00 2001
From: Jaex <Jaex@users.noreply.github.com>
Date: Mon, 19 Jun 2017 19:50:28 +0300
Subject: [PATCH] Avoid checking pixels if it is not 32 bpp already

---
 ShareX.HelpersLib/Helpers/ImageHelpers.cs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/ShareX.HelpersLib/Helpers/ImageHelpers.cs b/ShareX.HelpersLib/Helpers/ImageHelpers.cs
index 037e56a41..50c98c719 100644
--- a/ShareX.HelpersLib/Helpers/ImageHelpers.cs
+++ b/ShareX.HelpersLib/Helpers/ImageHelpers.cs
@@ -676,10 +676,15 @@ public static bool IsImagesEqual(Bitmap bmp1, Bitmap bmp2)
 
         public static bool IsImageTransparent(Bitmap bmp)
         {
-            using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bmp, true, ImageLockMode.ReadOnly))
+            if (bmp != null && bmp.PixelFormat == PixelFormat.Format32bppArgb)
             {
-                return unsafeBitmap.IsTransparent();
+                using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bmp, true, ImageLockMode.ReadOnly))
+                {
+                    return unsafeBitmap.IsTransparent();
+                }
             }
+
+            return false;
         }
 
         public static bool AddMetadata(Image img, int id, string text)