Everything is now OpenRA, not OpenRa

OpenRA.Game/Graphics/SheetBuilder.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System.Drawing;
+
+namespace OpenRA.Graphics
+{
+	class SheetBuilder
+	{
+		public static SheetBuilder SharedInstance;
+		public static void Initialize(Renderer r)
+		{
+			SharedInstance = new SheetBuilder(r, TextureChannel.Red);
+		}
+
+		public SheetBuilder(Renderer r, TextureChannel ch)
+		{
+			renderer = r;
+			current = null;
+			rowHeight = 0;
+			channel = null;
+			initialChannel = ch;
+		}
+
+		public Sprite Add(byte[] src, Size size)
+		{
+			Sprite rect = Allocate(size);
+			Util.FastCopyIntoChannel(rect, src);
+			return rect;
+		}
+
+		public Sprite Add(Size size, byte paletteIndex)
+		{
+			byte[] data = new byte[size.Width * size.Height];
+			for (int i = 0; i < data.Length; i++)
+				data[i] = paletteIndex;
+
+			return Add(data, size);
+		}
+
+		Sheet NewSheet() { return new Sheet( renderer, new Size( Renderer.SheetSize, Renderer.SheetSize ) ); }
+
+		Renderer renderer;
+		Sheet current = null;
+		int rowHeight = 0;
+		Point p;
+		TextureChannel? channel = null;
+		TextureChannel initialChannel;
+
+		TextureChannel? NextChannel(TextureChannel? t)
+		{
+			if (t == null)
+				return initialChannel;
+
+			switch (t.Value)
+			{
+				case TextureChannel.Red: return TextureChannel.Green;
+				case TextureChannel.Green: return TextureChannel.Blue;
+				case TextureChannel.Blue: return TextureChannel.Alpha;
+				case TextureChannel.Alpha: return null;
+
+				default: return null;
+			}
+		}
+
+		public Sprite Allocate(Size imageSize)
+		{
+			if (current == null)
+			{
+				current = NewSheet();
+				channel = NextChannel(null);
+			}
+
+			if (imageSize.Width + p.X > current.Size.Width)
+			{
+				p = new Point(0, p.Y + rowHeight);
+				rowHeight = imageSize.Height;
+			}
+
+			if (imageSize.Height > rowHeight)
+				rowHeight = imageSize.Height;
+
+			if (p.Y + imageSize.Height > current.Size.Height)
+			{
+
+				if (null == (channel = NextChannel(channel)))
+				{
+					current = NewSheet();
+					channel = NextChannel(channel);
+				}
+
+				rowHeight = imageSize.Height;
+				p = new Point(0,0);
+			}
+
+			Sprite rect = new Sprite(current, new Rectangle(p, imageSize), channel.Value);
+			p.X += imageSize.Width;
+
+			return rect;
+		}
+	}
+}