Add support for hardware cursors.

OpenRA.Game/Graphics/HardwareCursor.cs

@@ -0,0 +1,138 @@
+#region Copyright & License Information
+/*
+* Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+* This file is part of OpenRA, which is free software. It is made
+* available to you under the terms of the GNU General Public License
+* as published by the Free Software Foundation. For more information,
+* see COPYING.
+*/
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+
+namespace OpenRA.Graphics
+{
+	public class HardwareCursor : ICursor
+	{
+		readonly Dictionary<string, IHardwareCursor[]> hardwareCursors = new Dictionary<string, IHardwareCursor[]>();
+		readonly CursorProvider cursorProvider;
+		CursorSequence cursor;
+
+		public HardwareCursor(CursorProvider cursorProvider)
+		{
+			this.cursorProvider = cursorProvider;
+
+			foreach (var kv in cursorProvider.Cursors)
+			{
+				var palette = cursorProvider.Palettes[kv.Value.Palette];
+				var hc = kv.Value.Frames
+					.Select(f => CreateCursor(f, palette, kv.Key, kv.Value))
+					.ToArray();
+
+				hardwareCursors.Add(kv.Key, hc);
+			}
+
+			Update();
+		}
+
+		IHardwareCursor CreateCursor(ISpriteFrame f, ImmutablePalette palette, string name, CursorSequence sequence)
+		{
+			var hotspot = sequence.Hotspot - f.Offset.ToInt2() + new int2(f.Size) / 2;
+
+			// Expand the frame if required to include the hotspot
+			var frameWidth = f.Size.Width;
+			var dataWidth = f.Size.Width;
+			var dataX = 0;
+			if (hotspot.X < 0)
+			{
+				dataX = -hotspot.X;
+				dataWidth += dataX;
+				hotspot.X = 0;
+			}
+			else if (hotspot.X >= frameWidth)
+				dataWidth = hotspot.X + 1;
+
+			var frameHeight = f.Size.Height;
+			var dataHeight = f.Size.Height;
+			var dataY = 0;
+			if (hotspot.Y < 0)
+			{
+				dataY = -hotspot.Y;
+				dataHeight += dataY;
+				hotspot.Y = 0;
+			}
+			else if (hotspot.Y >= frameHeight)
+				dataHeight = hotspot.Y + 1;
+
+			var data = new byte[4 * dataWidth * dataHeight];
+			for (var j = 0; j < frameHeight; j++)
+			{
+				for (var i = 0; i < frameWidth; i++)
+				{
+					var bytes = BitConverter.GetBytes(palette[f.Data[j * frameWidth + i]]);
+					var start = 4 * ((j + dataY) * dataWidth + dataX + i);
+					for (var k = 0; k < 4; k++)
+						data[start + k] = bytes[k];
+				}
+			}
+
+			return Game.Renderer.Device.CreateHardwareCursor(name, new Size(dataWidth, dataHeight), data, hotspot);
+		}
+
+		public void SetCursor(string cursorName)
+		{
+			if ((cursorName == null && cursor == null) || (cursor != null && cursorName == cursor.Name))
+				return;
+
+			if (cursorName == null || !cursorProvider.Cursors.TryGetValue(cursorName, out cursor))
+				cursor = null;
+
+			Update();
+		}
+
+		int frame;
+		int ticks;
+		public void Tick()
+		{
+			if (cursor == null || cursor.Length == 1)
+				return;
+
+			if (++ticks > 2)
+			{
+				ticks -= 2;
+				frame++;
+
+				Update();
+			}
+		}
+
+		void Update()
+		{
+			if (cursor == null)
+				Game.Renderer.Device.SetHardwareCursor(null);
+			else
+			{
+				if (frame >= cursor.Length)
+					frame = frame % cursor.Length;
+
+				Game.Renderer.Device.SetHardwareCursor(hardwareCursors[cursor.Name][frame]);
+			}
+		}
+
+		public void Render(Renderer renderer) { }
+
+		public void Dispose()
+		{
+			foreach (var cursors in hardwareCursors)
+				foreach (var cursor in cursors.Value)
+					cursor.Dispose();
+
+			hardwareCursors.Clear();
+		}
+	}
+}