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watykanczyk/dllsupport/GifImage.cs

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+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Reflection;
+
+namespace dllsupport;
+
+public class GifImage
+{
+	private Image gifImage;
+
+	private FrameDimension dimension;
+
+	private int frameCount;
+
+	private int currentFrame = -1;
+
+	private bool reverse;
+
+	private int step = 1;
+
+	public bool ReverseAtEnd
+	{
+		get
+		{
+			return reverse;
+		}
+		set
+		{
+			reverse = value;
+		}
+	}
+
+	public GifImage(string path)
+	{
+		Stream manifestResourceStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(path);
+		gifImage = Image.FromStream(manifestResourceStream);
+		dimension = new FrameDimension(gifImage.FrameDimensionsList[0]);
+		frameCount = gifImage.GetFrameCount(dimension);
+	}
+
+	public Image GetNextFrame()
+	{
+		currentFrame += step;
+		if (currentFrame >= frameCount || currentFrame < 1)
+		{
+			if (reverse)
+			{
+				step *= -1;
+				currentFrame += step;
+			}
+			else
+			{
+				currentFrame = 0;
+			}
+		}
+		return GetFrame(currentFrame);
+	}
+
+	public Image GetFrame(int index)
+	{
+		gifImage.SelectActiveFrame(dimension, index);
+		return (Image)gifImage.Clone();
+	}
+}