Add additional rendering Technologies

Scintilla.NET/NativeMethods.cs

@@ -1189,6 +1189,7 @@ public static class NativeMethods
     public const int SC_TECHNOLOGY_DIRECTWRITE = 1;
     public const int SC_TECHNOLOGY_DIRECTWRITERETAIN = 2;
     public const int SC_TECHNOLOGY_DIRECTWRITEDC = 3;
+    public const int SC_TECHNOLOGY_DIRECT_WRITE_1 = 4;
 
     // Tab draw
     public const int SCTD_LONGARROW = 0;

Scintilla.NET/Scintilla.cs

@@ -6492,6 +6492,11 @@ public Technology Technology
             set
             {
                 int technology = (int)value;
+                // DirectWrite 1 requires Windows 8 / Windows Server 2012 or later. If the user attempts to set it on an unsupported OS, fall back to default rendering technology.
+                if (value == Technology.DirectWrite1 && !(Environment.OSVersion.Platform == PlatformID.Win32NT && Environment.OSVersion.Version >= new Version(6, 2)))
+                {
+                    technology = (int)Technology.Default;
+                }
                 DirectMessage(NativeMethods.SCI_SETTECHNOLOGY, new IntPtr(technology));
             }
         }

Scintilla.NET/Technology.cs

@@ -14,5 +14,21 @@ public enum Technology
     /// Renders text using Direct2D/DirectWrite. Since Direct2D buffers drawing,
     /// Scintilla's buffering can be turned off with <see cref="Scintilla.BufferedDraw" />.
     /// </summary>
-    DirectWrite = NativeMethods.SC_TECHNOLOGY_DIRECTWRITE
+    DirectWrite = NativeMethods.SC_TECHNOLOGY_DIRECTWRITE,
+
+    /// <summary>
+    /// Request that the frame is retained after being presented which may prevent drawing failures on some cards and drivers.
+    /// </summary>
+    DirectWriteRetain = NativeMethods.SC_TECHNOLOGY_DIRECTWRITERETAIN,
+
+    /// <summary>
+    /// Use DirectWrite to draw into a GDI DC. This mode may work for remote access sessions.
+    /// </summary>
+    DirectWriteDc = NativeMethods.SC_TECHNOLOGY_DIRECTWRITEDC,
+
+    /// <summary>
+    /// Renders text using Windows 8 DirectWrite 1.1 features in a lower level way that manages graphics state more explicitly.
+    /// Technically DirectWrite 1.1 is available on some Windows 7 systems, but it's difficult to detect and not worth the effort. This technology is only available on Windows 8 and later.
+    /// </summary>
+    DirectWrite1 = NativeMethods.SC_TECHNOLOGY_DIRECT_WRITE_1,
 }