namespace ScreenConnect;

public class GrayscaleScreenDecoder : SimpleScreenDecoder
{
	public GrayscaleScreenDecoder(IMultiCallCoder coder)
		: base(4, 0, coder)
	{
	}

	protected unsafe override void Process(byte* data, int width, int height, int stride, byte* workingBuffer, int rowLength, bool hasPadding)
	{
		int num = 0;
		while (num < height)
		{
			ReadRowData(workingBuffer, rowLength, num == height - 1);
			byte* ptr = workingBuffer;
			int* ptr2 = (int*)data;
			for (int i = 0; i < width; i++)
			{
				byte b = 0;
				b = ((i % 2 != 0) ? ((byte)(*(ptr++) & 0xF)) : ((byte)(*ptr >> 4)));
				*(ptr2++) = -16777216 | b | (b << 4) | (b << 8) | (b << 12) | (b << 16) | (b << 20);
			}
			num++;
			data += stride;
		}
	}
}