Informs cairo of the new size of the X Drawable underlying
the surface. For a surface created for a Window
(rather than a Pixmap), this function must be called
each time the size of the window changes. (For a
subwindow, you are normally resizing the window yourself,
but for a toplevel window, it is necessary to
listen for ConfigureNotify events.)
A Pixmap can never change size, so it is never necessary
to call this function on a surface created for a Pixmap.
Informs cairo of the new size of the X Drawable underlying the surface. For a surface created for a Window (rather than a Pixmap), this function must be called each time the size of the window changes. (For a subwindow, you are normally resizing the window yourself, but for a toplevel window, it is necessary to listen for ConfigureNotify events.)
A Pixmap can never change size, so it is never necessary to call this function on a surface created for a Pixmap.