using System;

namespace ScreenConnect;

public abstract class ScreenCodec : BufferStream
{
	private byte[][] workingBuffers;

	private long outputCount;

	public event EventHandler<EventArgs> NeedsBufferCycled;

	protected ScreenCodec()
	{
		workingBuffers = new byte[10][];
	}

	public unsafe long Process(IBitmapData bitmapData)
	{
		bitmapData.AssertArgumentNonNull("bitmapData");
		bitmapData.PixelModel.CanBlockCopyBgr32.AssertTrue();
		long num = outputCount;
		Process((byte*)(void*)bitmapData.Scan0, bitmapData.Width, bitmapData.Height, bitmapData.Stride);
		return outputCount - num;
	}

	protected unsafe abstract void Process(byte* data, int width, int height, int stride);

	protected byte[] GetWorkingBuffer(int requiredSizeNotIncludingOverreach, int bufferIndex = 0)
	{
		int num = requiredSizeNotIncludingOverreach + 8;
		if (workingBuffers[bufferIndex] == null || workingBuffers[bufferIndex].Length < num)
		{
			workingBuffers[bufferIndex] = new byte[num];
		}
		return workingBuffers[bufferIndex];
	}

	protected override void OnNeedsBufferCycled()
	{
		outputCount += base.BufferCompletedCount;
		this.RaiseEvent(NeedsBufferCycled, EventArgs.Empty);
	}
}