opencv-vala-gtk-example

/*
 * Simple example on how to load an image using OpenCV and display it in Gtk
 * Compile with: valac --pkg opencv --pkg gdk-pixbuf-2.0 --pkg gtk+-2.0 opencv.vala
 * Author: A.Lepe (dev@alepe.com)
 */

using OpenCV;
using Gdk;
using Gtk;

class Utils {
    public static void PixbufDestroyNotify (uint8* pixels) {
            GLib.stdout.printf("delete buffer\n");
            delete pixels;
    }
    public static Gtk.Widget convertOpenCvToGtk(IPL.Image gtkMask) {
        Gtk.Widget gtkImg;
        Gdk.Pixbuf pix = new Gdk.Pixbuf.from_data (
                gtkMask.image_data,//Raw image data
                Gdk.Colorspace.RGB,                     //Colorspace
                false,                                  //Has alpha channel or not
                gtkMask.depth,                          //Bits per pixel
                gtkMask.width,                          //Width of image
                gtkMask.height,                         //Height of image
                gtkMask.width_step,                     //Row stride
                Utils.PixbufDestroyNotify               //destroy function (optional)
        );
        gtkImg = new Gtk.Image.from_pixbuf (pix);
        return gtkImg;
    }
}

void main (string[] args) {
    IPL.Image img = new IPL.Image.load("/var/www/test/image.jpg");
    stdout.printf("Width: %d\n", img.width);
    stdout.printf("Height: %d\n", img.height);
    Gtk.init (ref args);

    var win = new Gtk.Window ();
    win.set_size_request (img.width,img.height);
    win.border_width = 5;
    win.title = "Widget test";
    win.destroy.connect (Gtk.main_quit);

    var frame = new Frame ("Example Vala Widget");
    win.add (frame);
    frame.add (Utils.convertOpenCvToGtk(img));

    win.show_all ();
    Gtk.main ();
}