git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1113 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.FileFormats/TileSheetBuilder.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenRa.FileFormats
+{
+	// T is probably going to be BluntDirectX.Direct3D.Texture
+	public delegate T Provider<T>();
+
+	public class TileSheetBuilder<T>
+		where T : class
+	{
+		readonly Size pageSize;
+		readonly Provider<T> pageProvider;
+
+		public TileSheetBuilder(Size pageSize, Provider<T> pageProvider)
+		{
+			this.pageSize = pageSize;
+			this.pageProvider = pageProvider;
+		}
+
+		T current = null;
+		int x = 0, y = 0, rowHeight = 0;
+
+		public SheetRectangle<T> AddImage(Size imageSize)
+		{
+			if (imageSize.Width > pageSize.Width || imageSize.Height > pageSize.Height)
+				return null;
+
+			if (current == null)
+				current = pageProvider();
+
+			if (imageSize.Height > rowHeight || rowHeight == 0 || imageSize.Width + x > pageSize.Width)
+			{
+				y += rowHeight;
+				rowHeight = imageSize.Height;
+				x = 0;
+			}
+
+			if (y + imageSize.Height > pageSize.Height)
+			{
+				current = pageProvider();
+				x = y = rowHeight = 0;
+			}
+
+			SheetRectangle<T> rect = new SheetRectangle<T>(current, new Point(x, y), imageSize);
+			x += imageSize.Width;
+
+			return rect;
+		}
+	}
+
+	public class SheetRectangle<T>
+		where T : class
+	{
+		readonly Point origin;
+		readonly Size size;
+		readonly T sheet;
+
+		internal SheetRectangle(T sheet, Point origin, Size size)
+		{
+			this.origin = origin;
+			this.size = size;
+			this.sheet = sheet;
+		}
+	}
+}