Fix transparency

src/Overlay.NET/Directx/Direct2DRenderer.cs

@@ -42,15 +42,10 @@ namespace Overlay.NET.Directx {
 
         //transparent background color
         /// <summary>
-        ///     The GDI transparent
+        ///     The transparent. Must be all zero: the render target is premultiplied, so Color.Transparent
+        ///     (ARGB 0,255,255,255) would be additive white instead of transparent.
         /// </summary>
-        private static Color _gdiTransparent = Color.Transparent;
-
-        /// <summary>
-        ///     The transparent
-        /// </summary>
-        private static readonly RawColor4 Transparent = new RawColor4(_gdiTransparent.R, _gdiTransparent.G, _gdiTransparent.B,
-            _gdiTransparent.A);
+        private static readonly RawColor4 Transparent = new RawColor4(0, 0, 0, 0);
 
         //direct x vars
         /// <summary>