GifRecorder/Encoding/PixelUtil.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace ScreenToGif.Encoding
{
    /// <summary>
    /// Helper Class that gets and sets image pixels using Marshal calls.
    /// </summary>
    public class PixelUtil
    {
        readonly Bitmap _source = null;
        IntPtr _iptr = IntPtr.Zero;
        BitmapData _bitmapData = null;

        public byte[] Pixels { get; set; }
        public int Depth { get; private set; }
        public int Width { get; private set; }
        public int Height { get; private set; }

        /// <summary>
        /// Pixel marshalling class, use this to access pixels rapidly.
        /// </summary>
        /// <param name="source">The Bitmap to work with</param>
        public PixelUtil(Bitmap source)
        {
            //this.source = new Bitmap(source); //Not working
            this._source = source;
        }

        /// <summary>
        /// Lock bitmap data
        /// </summary>
        public void LockBits()
        {
            try
            {
                // Get width and height of bitmap
                Width = _source.Width;
                Height = _source.Height;

                // Get total locked pixels count
                int pixelCount = Width * Height;

                // Create rectangle to lock
                var rect = new Rectangle(0, 0, Width, Height);

                // get source bitmap pixel format size
                Depth = Image.GetPixelFormatSize(_source.PixelFormat);

                // Check if bpp (Bits Per Pixel) is 8, 24, or 32
                if (Depth != 8 && Depth != 24 && Depth != 32)
                {
                    throw new ArgumentException("Only 8, 24 and 32 bpp images are supported.");
                }