Gamma Init

app/WindowsDisplayAPI/Native/DeviceContext/DCHandle.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace WindowsDisplayAPI.Native.DeviceContext
+{
+    internal class DCHandle : SafeHandle
+    {
+        private readonly bool _created;
+
+        private DCHandle(IntPtr handle, bool created) : base(handle, true)
+        {
+            _created = created;
+        }
+
+        public override bool IsInvalid
+        {
+            get => handle == IntPtr.Zero;
+        }
+
+        public static DCHandle CreateFromDevice(string screenName, string devicePath)
+        {
+            return new DCHandle(
+                DeviceContextApi.CreateDC(screenName, devicePath, null, IntPtr.Zero),
+                true
+            );
+        }
+
+        public static DCHandle CreateFromScreen(string screenName)
+        {
+            return CreateFromDevice(screenName, screenName);
+        }
+
+        public static DCHandle CreateFromWindow(IntPtr windowHandle)
+        {
+            return new DCHandle(
+                DeviceContextApi.GetDC(windowHandle),
+                true
+            );
+        }
+
+        public static DCHandle CreateGlobal()
+        {
+            return new DCHandle(
+                DeviceContextApi.CreateDC("DISPLAY", null, null, IntPtr.Zero),
+                true
+            );
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            return _created
+                ? DeviceContextApi.DeleteDC(this.handle)
+                : DeviceContextApi.ReleaseDC(IntPtr.Zero, this.handle);
+        }
+    }
+}