converter.cs

using ACE.DatLoader.FileTypes;
using ACE.Entity.Enum;
using SkiaSharp;

List<int> GetImageColorArray(Texture texture)
{
  List<int> colors = new List<int>();
  if (texture.Length == 0) return colors;

  switch (texture.Format)
  {
    case SurfacePixelFormat.PFID_R8G8B8: // RGB
      using (BinaryReader reader = new BinaryReader(new MemoryStream(texture.SourceData)))
      {
        for (uint i = 0; i < texture.Height; i++)
          for (uint j = 0; j < texture.Width; j++)
          {
            byte b = reader.ReadByte();
            byte g = reader.ReadByte();
            byte r = reader.ReadByte();
            int color = (r << 16) | (g << 8) | b;
            colors.Add(color);
          }
      }
      break;
    case SurfacePixelFormat.PFID_A8R8G8B8: // ARGB format. Most UI textures fall into this category
      using (BinaryReader reader = new BinaryReader(new MemoryStream(texture.SourceData)))
      {
        for (uint i = 0; i < texture.Height; i++)
          for (uint j = 0; j < texture.Width; j++)
            colors.Add(reader.ReadInt32());
      }
      break;
  }

  return colors;
}


SKBitmap GetBitmap(Texture texture, List<int> colorArray)
{
  SKBitmap image = new SKBitmap(texture.Width, texture.Height);
  switch (texture.Format)
  {
    case SurfacePixelFormat.PFID_R8G8B8:
    case SurfacePixelFormat.PFID_CUSTOM_LSCAPE_R8G8B8:
      for (int i = 0; i < texture.Height; i++)
        for (int j = 0; j < texture.Width; j++)
        {
          int idx = (i * texture.Width) + j;
          byte r = (byte)((colorArray[idx] & 0xFF0000) >> 16);
          byte g = (byte)((colorArray[idx] & 0xFF00) >> 8);
          byte b = (byte)(colorArray[idx] & 0xFF);
          image.SetPixel(j, i, new SKColor(r, g, b));
        }
      break;
    case SurfacePixelFormat.PFID_A8R8G8B8:
      for (int i = 0; i < texture.Height; i++)
        for (int j = 0; j < texture.Width; j++)
        {
          int idx = (i * texture.Width) + j;
          byte a = (byte)((int)((colorArray[idx] & 0xFF000000) >> 24));
          byte r = (byte)((colorArray[idx] & 0xFF0000) >> 16);
          byte g = (byte)((colorArray[idx] & 0xFF00) >> 8);
          byte b = (byte)(colorArray[idx] & 0xFF);
          image.SetPixel(j, i, new SKColor(r, g, b, a));

        }
      break;
  }

  return image;
}

string filePath = "../ACEmulator/ACE/Dats/client_portal.dat";
long offset = 885193728 + 4; // Set your desired offset here

using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
using (BinaryReader reader = new BinaryReader(fs))
{
  fs.Seek(offset, SeekOrigin.Begin);

  // Texture
  var texture = new Texture();
  texture.Unpack(reader);
  Console.WriteLine($"Data at offset {offset}. Format is {texture.Format}; {texture.Width}x{texture.Height}; Length={texture.Length}");

  // Get image data
  List<int> colors = GetImageColorArray(texture);
  var bitmap = GetBitmap(texture, colors);

  // Save the bitmap to a file
  string outputPath = "texture_output.png";

  using (var image = SKImage.FromBitmap(bitmap))
  using (var data = image.Encode(SKEncodedImageFormat.Png, 100))
  using (var stream = File.OpenWrite(outputPath))
  {
    data.SaveTo(stream);
  }

  Console.WriteLine($"Image saved to {Path.GetFullPath(outputPath)}");
}