public byte[] Save(IEnumerable <Color> colors)
{
byte nibbleBuffer = 0;
bool writeNibble = false;
var ms = new MemoryStream();
using (var bw = new BinaryWriter(ms, System.Text.Encoding.ASCII, true))
{
foreach (var color in colors)
{
var r = (RedDepth == 0) ? 0 : Convert.ChangeBitDepth(color.R, 8, RedDepth);
var g = (GreenDepth == 0) ? 0 : Convert.ChangeBitDepth(color.G, 8, GreenDepth);
var rShift = GreenDepth;
long value = g;
value |= (uint)(r << rShift);
switch (BitDepth)
{
case 4:
if (writeNibble)
{
nibbleBuffer |= (byte)(value & 0xF);
bw.Write(nibbleBuffer);
}
else
{
nibbleBuffer = (byte)((value & 0xF) << 4);
}
writeNibble = !writeNibble;
break;
case 8:
bw.Write((byte)value);
break;
case 16:
bw.Write(Convert.ToByteArray((ushort)value, 2, ByteOrder));
break;
default:
throw new InvalidOperationException($"BitDepth {BitDepth} not supported!");
}
}
if (writeNibble)
{
bw.Write(nibbleBuffer);
}
}
return(ms.ToArray());
}
private void CreateTempASTCFile(string astcFile, byte[] texData)
{
var astc = File.Create(astcFile);
using (var bw = new BinaryWriter(astc, System.Text.Encoding.ASCII, true))
{
bw.Write(0x5CA1AB13); // magic val
bw.Write((byte)_xDim);
bw.Write((byte)_yDim);
bw.Write((byte)_zDim);
bw.Write(Convert.ToByteArray(Width, 3, ByteOrder));
bw.Write(Convert.ToByteArray(Height, 3, ByteOrder));
bw.Write(Convert.ToByteArray(1, 3, ByteOrder));
bw.Write(texData);
}
astc.Dispose();
astc.Close();
}