x11 pixture edit and copy

function xy ( window w )      // wich is the aplication window
  XWindowAttributes x_window_attrs;
  CHECK(XGetWindowAttributes(display_, w, &x_window_attrs));

 const Window frame = XCreateSimpleWindow(
      display_,
      root_,
      x_window_attrs.x,
      x_window_attrs.y,
      x_window_attrs.width,
      x_window_attrs.height,
      BORDER_WIDTH,
      BORDER_COLOR,
      BG_COLOR);


  XSelectInput(
      display_,
      frame,
      Somemask);

// here is my helpless try to copy images from one frame to another
// 1. i loop over the size of the image
// 2. i generate a XImage / Pixmap  ( non of wich im shure of works just found them in tutorials)
// 3. do stuff pixel_line by pixel_line
// 4. trying to reprint it to the window


for (pixel_row=0; pixel_row <  x_window_attrs.height;  pixel_row++){
  XImage *img = XGetImage(display_, w, 0, pixel_row, x_window_attrs.width, 1, AllPlanes, XYPixmap);
  Pixmap p = XCreatePixmap(display_, XDefaultRootWindow(display_), x_window_attrs.width, 1, x_window_attrs.depth);

  // do stuff with pixel by pixel line

  XGCValues gcvalues;
  GC gc = XCreateGC(display_, p, 0, &gcvalues);
  XCopyArea(display_, p, w, gc, 0, pixel_row, x_window_attrs.width, 1, 0, 0);
}