Clutter-18 ▶ Clutter ▶ threads_add_repaint_func

Adds a function to be called whenever Clutter is processing a new frame.

If the function returns false it is automatically removed from the list of repaint functions and will not be called again.

This function is guaranteed to be called from within the same thread that called clutter_main(), and while the Clutter lock is being held; the function will be called within the main loop, so it is imperative that it does not block, otherwise the frame time budget may be lost.

A repaint function is useful to ensure that an update of the scenegraph is performed before the scenegraph is repainted. The flags passed to this function will determine the section of the frame processing that will result in func being called.

Adding a repaint function does not automatically ensure that a new frame will be queued.

When the repaint function is removed (either because it returned false or because clutter_threads_remove_repaint_func() has been called) the notify function will be called, if any is set.