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clinuxgtkx11

How can I use GTK4 of C to get the pixels of the screen?

How can I use GTK4 of C to get the pixels of the screen?

If GTK4 does not have an API, how can I get the pixels of the screen from Xlib?

Solution

  • I don't know about GTK4 but in X11:

    Example:

    //open display and get the root window of the default screen
//note: there could be more than one screen
Display *dpy = XOpenDisplay(NULL);
Window root = RootWindow(dpy, DefaultScreen(dpy));

//get the window attributes of the root window
XWindowAttributes attr;
XGetWindowAttributes(dpy, root, &attr);

//get the image of the root window
XImage* image = XGetImage(
    dpy, 
    root, 
    0, 0, //attr.x, attr.y
    attr.width, attr.height, 
    AllPlanes, 
    ZPixmap
);

    Hint: Include X11/Xlib.h and compile with -lX11