Clear Bitmap Data

ClearBitmapData.cs

void ClearBitmapData(BitmapData bd, byte[] color)
{
	var pf = bd.PixelFormat;

	var size = sizeof(byte);
	if(pf == PixelFormat.Format16bppRgb555)
		size *= 2;
	else if(pf == PixelFormat.Format24bppRgb)
		size *= 3;
	else if (pf == PixelFormat.Format32bppArgb)
		size *= 4;

	var bytesRow = new byte[bd.Width * size];
	for(int x = 0; x < bytesRow.Length; x++)
	{
		int j = x % color.Length;
		bytesRow[x] = color[j];
	}

	for(int y = 0; y < bd.Height; y++)
	{
		IntPtr rowPtr = bd.Scan0 + (bd.Stride * y);
		Marshal.Copy(bytesRow, 0, rowPtr, bytesRow.Length);
	}
}


private void DoWork()
{
	pictureBox1.Image = null;

	var start = DateTime.UtcNow;

	Bitmap b = new Bitmap(4000, 1500, PixelFormat.Format32bppArgb);
	var bd = b.LockBits(new Rectangle(Point.Empty, b.Size), ImageLockMode.ReadWrite, b.PixelFormat);
	//ClearBitmapData(bd, new[] { (byte)0xFA, (byte)0xFA, (byte)0xB0, (byte)0x00 });
	ClearBitmapData(bd, new[] { (byte)0x00, (byte)0xB0, (byte)0xFA, (byte)0xFF });
	b.UnlockBits(bd);

	var end = DateTime.UtcNow;

	pictureBox1.Image = b;

	MessageBox.Show((end - start).ToString());

	b.Save("C:\\gnao.bmp");
}