How to request javafx pixels rather than receiving it?

[Thiago Milczarek Sayão]

Hi,
I'm doing some experimenting on new ways to implement the gtk glass backend
(mainly targeting wayland support).

JavaFX View implementations receives the data to be drawn.
I want to be able to request it synchronously.

If JavaFX needs to paint I need it to request the glass backend without the
data.
So the backend would request back the data to be drawn when it's ready.

I could keep a buffer on GtkView.java. Would it be too ugly?

-- Thiago.
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