Getting RGB array from image in C#

Question

I\'m currently writing a C# implementation of a little program which I have written in Java.

I had used BufferedImage.getRGB(int startX, int startY, int w, int

Answer 1

You'd use Bitmap.LockBits to get direct access to the pixels in a bitmap. Here's a sample implementation, it returns one scanline from the passed bitmap as an int[]:

    int[] getRGB(Bitmap bmp, int line) {
        var data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height),
            System.Drawing.Imaging.ImageLockMode.ReadOnly,
            System.Drawing.Imaging.PixelFormat.Format32bppRgb);
        try {
            var ptr = (IntPtr)((long)data.Scan0 + data.Stride * (bmp.Height - line - 1));
            var ret = new int[bmp.Width];
            System.Runtime.InteropServices.Marshal.Copy(ptr, ret, 0, ret.Length * 4);
            return ret;
        }
        finally {
            bmp.UnlockBits(data);
        }
    }