Draws a color map of the colors in a Windows MetaFile

Program.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;

namespace WmfColorChecker
{
    public class Program
    {
        private static Metafile _wmf;
        private static List<Color> foundColors;

        public static void Main(string[] args)
        {
            var wmfFilePath = @"1708839-16.wmf";
            foundColors = new List<Color>();
            TestWmf(wmfFilePath);
            DrawColorMap(wmfFilePath);
        }

        private static void TestWmf(string filePath)
        {
            _wmf = new Metafile(filePath);
            using (var bitmap = new Bitmap(_wmf.Width, _wmf.Height))
            {
                using (var g = Graphics.FromImage(bitmap))
                {
                    var callBack = new Graphics.EnumerateMetafileProc(wmfCallback);
                    g.EnumerateMetafile(_wmf, new Rectangle(0, 0, _wmf.Width, _wmf.Height), callBack);
                }
            }
            _wmf.Dispose();
        }

        private static bool wmfCallback(EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, PlayRecordCallback callbackData)
        {

            byte[] recordData = null;
            if (data != IntPtr.Zero)
            {
                recordData = new byte[dataSize];
                Marshal.Copy(data, recordData, 0, dataSize);
            }

            if (recordType == EmfPlusRecordType.WmfCreateBrushIndirect)
            {
                foundColors.Add(Color.FromArgb(recordData[2], recordData[3], recordData[4]));
            }
            else if (recordType == EmfPlusRecordType.WmfCreateBrushIndirect)
            {
                foundColors.Add(Color.FromArgb(recordData[6], recordData[7], recordData[8])); //gets outline colors, if any
            }

            _wmf.PlayRecord(recordType, flags, dataSize, recordData);
            return true;
        }

        private static void DrawColorMap(string filePath)
        {
            using (var bitmap = new Bitmap(100, 100 * foundColors.Count + 1))
            {
                using (var g = Graphics.FromImage(bitmap))
                {
                    var x = 0;
                    var y = 0;
                    foreach (var foundColor in foundColors)
                    {
                        g.FillRectangle(new SolidBrush(foundColor), x, y, 100, 100);
                        y += 100;
                    }
                }

                var newFile = string.Format("{0}-colormap.png", Path.GetFileNameWithoutExtension(filePath));
                if (File.Exists(newFile))
                {
                    File.Delete(newFile);
                }
                bitmap.Save(newFile, ImageFormat.Png);
            }
        }
    }
}