utility to show the contents of block caches, for those of us who suck at viewing channel-multiplexed images :)

git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1242 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.BlockCacheVisualizer/Form1.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Text;
+using System.Windows.Forms;
+using System.IO;
+
+namespace OpenRa.BlockCacheVisualizer
+{
+	public partial class Form1 : Form
+	{
+		public Form1()
+		{
+			InitializeComponent();
+			Visible = true;
+
+			OpenFileDialog d = new OpenFileDialog();
+			d.RestoreDirectory = true;
+			d.Filter = "OpenRA PNG Block Cache (*.png)|*.png";
+
+			if (DialogResult.OK != d.ShowDialog())
+				return;
+
+			string filename = d.FileName;
+			string palname = Path.GetDirectoryName(filename) + "\\palette-cache.png";
+
+			Bitmap palette = new Bitmap(palname);
+			Bitmap block = new Bitmap(filename);
+
+			unchecked
+			{
+				Color[] masks = { 
+					Color.FromArgb( (int)0xff000000 ), 
+					Color.FromArgb( (int)0x00ff0000 ), 
+					Color.FromArgb( (int)0x0000ff00 ), 
+					Color.FromArgb( (int)0x000000ff ) 
+				};
+
+				foreach (Color c in masks)
+				{
+					Bitmap b = ExtractChannelToBitmap(block, palette, c);
+					PictureBox pb = new PictureBox();
+
+					pb.SizeMode = PictureBoxSizeMode.AutoSize;
+					pb.Image = b;
+
+					flowLayoutPanel1.Controls.Add(pb);
+				}
+
+			}
+		}
+
+		int MaskColor(Color c, Color mask)
+		{
+			int result = 0;
+			if (mask.R > 0) result += c.R;
+			if (mask.G > 0) result += c.G;
+			if (mask.B > 0) result += c.B;
+			if (mask.A > 0) result += c.A;
+
+			return result;
+		}
+
+		Bitmap ExtractChannelToBitmap(Bitmap src, Bitmap pal, Color mask)
+		{
+			Bitmap dest = new Bitmap(src.Width, src.Height);
+
+			for( int i = 0; i < src.Width; i++ )
+				for (int j = 0; j < src.Height; j++)
+				{
+					int index = MaskColor(src.GetPixel(i, j), mask);
+					dest.SetPixel(i, j, pal.GetPixel(index, 0));
+				}
+
+			return dest;
+		}
+	}
+}