Added additional gdiplus check.

src/NzbDrone.Core/MediaCover/GdiPlusInterop.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace NzbDrone.Core.MediaCover
+{
+    public static class GdiPlusInterop
+    {
+        private static Exception _gdiPlusException;
+
+        static GdiPlusInterop()
+        {
+            TestLibrary();
+        }
+
+        private static void TestLibrary()
+        {
+            if (OsInfo.IsWindows)
+            {
+                return;
+            }
+
+            try
+            {
+                // We use StringFormat as test coz it gets properly cleaned up by the finalizer even if gdiplus is absent and is relatively non-invasive.
+                var strFormat = new StringFormat();
+
+                strFormat.Dispose();
+            }
+            catch (Exception ex)
+            {
+                _gdiPlusException = ex;
+            }
+        }
+
+        public static void CheckGdiPlus()
+        {
+            if (_gdiPlusException != null)
+            {
+                throw new DllNotFoundException("Couldn't load GDIPlus library", _gdiPlusException);
+            }
+        }
+    }
+}

src/NzbDrone.Core/MediaCover/ImageResizer.cs

@@ -24,6 +24,8 @@ public void Resize(string source, string destination, int height)
         {
             try
             {
+                GdiPlusInterop.CheckGdiPlus();
+
                 using (var sourceStream = _diskProvider.OpenReadStream(source))
                 {
                     using (var outputStream = _diskProvider.OpenWriteStream(destination))

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -686,6 +686,7 @@
     <Compile Include="Lifecycle\Commands\ShutdownCommand.cs" />
     <Compile Include="Lifecycle\LifecycleService.cs" />
     <Compile Include="MediaCover\CoverAlreadyExistsSpecification.cs" />
+    <Compile Include="MediaCover\GdiPlusInterop.cs" />
     <Compile Include="MediaCover\MediaCover.cs" />
     <Compile Include="MediaCover\ImageResizer.cs" />
     <Compile Include="MediaCover\MediaCoverService.cs" />