public IList <byte> DistinctColors(int?subImageId)
{
if (subImageId == null)
{
var buffer = new ReadOnlyByteImageBuffer(Width, Height, Width, TextureData);
return(CoreUtil.DistinctColors(buffer));
}
else
{
GetSubImageOffset(subImageId.Value, out var width, out var height, out var offset, out var stride);
ReadOnlySpan <byte> slice = TextureData.Slice(
offset,
width + (height - 1) * stride);
var buffer = new ReadOnlyByteImageBuffer((uint)width, (uint)height, (uint)stride, slice);
return(CoreUtil.DistinctColors(buffer));
}
}
