C# LockBits perfomance (int[,] to byte[])

Question

Graphics g;
using (var bmp = new Bitmap(_frame, _height, PixelFormat.Format24bppRgb))
{
    var data = bmp.LockBits(new Rectangle(0, 0, _frame, _height), ImageLockMo         


        

Answer 1

Try this using unsafe code:

byte* rp0;
int* vp0;
fixed (byte* rp1 = rgb)
{
    rp0 = rp1;
    fixed (int* vp1 = _values)
    {
        vp0 = vp1;
        Parallel.For(0, _width, (i) =>
        {
            var val = (byte)vp0[i];
            rp0[i] = val;
            rp0[i + 1] = val;
            rp0[i + 2] = val;
        });
    }
}

Runs very fast for me