internal void ReadPalette(BinaryReader reader, GfxPaletteInfo paletteInfo)
{
reader.BaseStream.Seek(paletteInfo.PaletteOffset, SeekOrigin.Begin);
for (var i = 0; i < paletteInfo.PaletteColourCount; i++)
{
var paletteEntry = reader.ByteToType <GfxPaletteEntry>();
paletteEntry.MultiplyBy(4);
this[paletteInfo.FirstPaletteColourIndex + i] = paletteEntry.ToColor();
}
}
public static IEnumerable <Image <Rgba32> > ConvertToBmps(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (!stream.CanRead || stream.CanSeek)
{
throw new ArgumentException($"Argument '{nameof(stream)}' must support reading and seeking");
}
using (var reader = new BinaryReader(stream, Encoding.Default, false))
{
GfxHeader header = reader.ByteToType <GfxHeader>();
List <int> offsets = new List <int>();
for (int i = 0; i <= header.BitmapCount; i++)
{
offsets.Add(reader.ReadInt32());
}
GfxPaletteInfo paletteInfo = header.CreatePaletteInfo(reader);
ImgSize size = new ImgSize(header.Width, header.Height);
using (Image <Rgba32> img = new Image <Rgba32>(header.Width, header.Height))
{
Painter painter = CreatePainter(img, reader, paletteInfo);
for (int i = 0; i < header.BitmapCount; i++)
{
var bmpStart = offsets[i];
var imgLength = offsets[i + 1] - offsets[i];
reader.BaseStream.Seek(bmpStart, SeekOrigin.Begin);
byte[] imgBytes = reader.ReadBytes(imgLength);
if (ShouldResetImage(i, imgBytes))
{
painter.ResetImage();
}
Decode(painter, size, imgBytes);
yield return(new Image <Rgba32>(img));
}
}
}
}
private static Painter CreatePainter(Image <Rgba32> image, BinaryReader reader, GfxPaletteInfo paletteInfo)
{
Painter painter = new Painter(image);
if (paletteInfo.PaletteOffset > 0)
{
painter.ReadPalette(reader, paletteInfo);
}
painter.DefaultRleVal = paletteInfo.FirstPaletteColourIndex + paletteInfo.PaletteColourCount;
return(painter);
}
