Restore SEBPatch

SafeExamBrowser.UserInterface.Shared/Utilities/Thumbnail.cs

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace SafeExamBrowser.UserInterface.Shared.Utilities
+{
+	/// <remarks>
+	/// See https://docs.microsoft.com/en-us/windows/win32/dwm/thumbnail-ovw.
+	/// </remarks>
+	public static class Thumbnail
+	{
+		public const int DWM_TNP_VISIBLE = 0x8;
+		public const int DWM_TNP_OPACITY = 0x4;
+		public const int DWM_TNP_RECTDESTINATION = 0x1;
+		public const int S_OK = 0;
+
+		[DllImport("dwmapi.dll")]
+		public static extern int DwmQueryThumbnailSourceSize(IntPtr thumbnail, out Size size);
+
+		[DllImport("dwmapi.dll")]
+		public static extern int DwmRegisterThumbnail(IntPtr destinationWindow, IntPtr sourceWindow, out IntPtr thumbnail);
+
+		[DllImport("dwmapi.dll")]
+		public static extern int DwmUnregisterThumbnail(IntPtr thumbnail);
+
+		[DllImport("dwmapi.dll")]
+		public static extern int DwmUpdateThumbnailProperties(IntPtr thumbnail, ref Properties properties);
+
+		[StructLayout(LayoutKind.Sequential)]
+		public struct Properties
+		{
+			public int Flags;
+			public Rectangle Destination;
+			public Rectangle Source;
+			public byte Opacity;
+			public bool Visible;
+			public bool SourceClientAreaOnly;
+		}
+
+		[StructLayout(LayoutKind.Sequential)]
+		public struct Size
+		{
+			public int X;
+			public int Y;
+		}
+
+		[StructLayout(LayoutKind.Sequential)]
+		public struct Rectangle
+		{
+			public int Left;
+			public int Top;
+			public int Right;
+			public int Bottom;
+		}
+	}
+}