// 
// CVTime.cs
//
// Authors: Mono Team
//     
// Copyright 2011 Novell, Inc
// Copyright 2011, 2012 Xamarin Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using CPF.Mac.CoreFoundation;
using CPF.Mac.ObjCRuntime;

namespace CPF.Mac.CoreVideo {
	public struct CVTime {
		public long TimeValue;
		public long TimeScale;
		public CVTimeFlags TimeFlags;
		public int Flags { get { return (int) TimeFlags; } set { TimeFlags = (CVTimeFlags) value; }}

		static IntPtr CoreVideo_libraryHandle = Dlfcn.dlopen (Constants.CoreVideoLibrary, 0);

		public static CVTime ZeroTime {
			get {
				return (CVTime) Marshal.PtrToStructure (Dlfcn.GetIndirect (CoreVideo_libraryHandle, "kCVZeroTime"), typeof (CVTime));
			}
		}

		public static CVTime IndefiniteTime {
			get {
				return (CVTime) Marshal.PtrToStructure (Dlfcn.GetIndirect (CoreVideo_libraryHandle, "kCVIndefiniteTime"), typeof (CVTime));
			}
		}

		public override bool Equals (object other)
		{
			if (!(other is CVTime))
				return false;
			
			CVTime b = (CVTime) other;
			
			return (TimeValue == b.TimeValue) && (TimeScale == b.TimeScale) && (TimeFlags == b.TimeFlags);
		}
		
		public override int GetHashCode ()
		{
			return TimeValue.GetHashCode () ^ TimeScale.GetHashCode () ^ Flags;
		}
		
		[DllImport (Constants.CoreVideoLibrary, EntryPoint = "CVGetCurrentHostTime")]
		public static extern Int64 GetCurrentHostTime ();
		[DllImport (Constants.CoreVideoLibrary, EntryPoint = "CVGetHostClockFrequency")]
		public static extern double GetHostClockFrequency ();
		[DllImport (Constants.CoreVideoLibrary, EntryPoint = "CVGetHostClockMinimumTimeDelta")]
		public static extern int GetHostClockMinimumTimeDelta ();
	}
}
