1 files changed, 70 insertions, 0 deletions
diff --git a/Backends/CairoBackend/src/EglBackend.cs b/Backends/CairoBackend/src/EglBackend.cs
new file mode 100644
index 00000000..909c3cd9
--- /dev/null
+++ b/Backends/CairoBackend/src/EglBackend.cs
@@ -0,0 +1,70 @@
+using System;
+using System.IO;
+using Drawing2D;
+using Glfw;
+
+namespace Crow.CairoBackend
+{
+	public class EglBackend : CairoBackendBase {
+		EGLDevice device;
+		/// <summary>
+		/// Create a new generic backend bound to the application surface
+		/// </summary>
+		/// <param name="width">backend surface width</param>
+		/// <param name="height">backend surface height</param>
+		public EglBackend (int width, int height, IntPtr nativeWindoPointer)
+		: base (width, height, nativeWindoPointer) {
+			if (nativeWindoPointer == IntPtr.Zero) {
+				Glfw3.Init ();
+				Glfw3.WindowHint (WindowAttribute.ClientApi, Constants.OpenglEsApi);
+				Glfw3.WindowHint (WindowAttribute.ContextVersionMajor, 3);
+				Glfw3.WindowHint (WindowAttribute.ContextVersionMinor, 2);
+				Glfw3.WindowHint (WindowAttribute.ContextCreationApi, Constants.EglContextApi);
+				Glfw3.WindowHint (WindowAttribute.Resizable, 1);
+				Glfw3.WindowHint (WindowAttribute.Decorated, 1);
+
+				hWin = Glfw3.CreateWindow (width, height, "win name", MonitorHandle.Zero, IntPtr.Zero);
+				if (hWin == IntPtr.Zero)
+					throw new Exception ("[GLFW3] Unable to create Window");
+			}
+
+			Glfw3.MakeContextCurrent (hWin);
+			Glfw3.SwapInterval (0);
+
+			device = new EGLDevice (Glfw3.GetEGLDisplay (), Glfw3.GetEGLContext (hWin));
+			surf = new GLSurface (device, Glfw3.GetEGLSurface (hWin), width, height);
+		}
+		/// <summary>
+		/// Create a new offscreen backend, used in perfTests
+		/// </summary>
+		/// <param name="width">backend surface width</param>
+		/// <param name="height">backend surface height</param>
+		public EglBackend (int width, int height)
+		: base (width, height, IntPtr.Zero) {
+			device = new EGLDevice (Glfw3.GetEGLDisplay (), IntPtr.Zero);
+			surf = new GLTextureSurface (device, width, height);
+		}
+		public override ISurface CreateSurface(int width, int height)
+			//=> new GLTextureSurface (device, width, height);
+			=> new ImageSurface (Format.ARGB32, width, height);
+		public override ISurface CreateSurface(byte[] data, int width, int height)
+			=> new ImageSurface (data, Format.ARGB32, width, height, 4 * width);
+		public override IContext PrepareUIFrame(IContext existingContext, IRegion clipping)
+		{
+			Glfw3.MakeContextCurrent (hWin);
+
+			IContext ctx = base.PrepareUIFrame (existingContext, clipping);
+
+			clear (ctx);
+
+			return ctx;
+		}
+		public override void FlushUIFrame(IContext ctx)
+		{
+			base.FlushUIFrame (ctx);
+
+			(surf as GLSurface).SwapBuffers ();
+		}
+	}
+}
+