Grey drawing area snippet

grey drawing area.c

width = DrawingArea->allocation.width;
height = DrawingArea->allocation.height;
rgbbuf = malloc (width * height * 3);
memset (rgbbuf, 240, width * height * 3); // set the background to GREY = (240, 240, 240)
//DrawBufferImage (rgbbuf, width, height, data);
gdk_draw_rgb_image (pixmap,
    DrawingArea->style->fg_gc[GTK_STATE_NORMAL],
    0, 0, width, height, GDK_RGB_DITHER_NONE, rgbbuf, width*3);
free (rgbbuf);