Your presentation on LibreOffice code

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> Perhaps what you want is to tweak/extend the code that maps an OUString> to a list of glyphs, the 
> vcl text layout.
>
> GenericSalLayout::LayoutText() at vcl/source/gdi/CommonSalLayout.cxx:286
> does that using harfbuzz, I believe standard gtk apps use that at the
> end as well.
What is OUString? Does it come from Harfbuzz which uses previously known characters? If so, it 
won't work. 

I need to map a combination of keys (two or more keys pressed simultaneously) to a glyph. As I 
said, the keys have non-standard keycodes. So I would still need to trap the keystrokes and save 
the values of the hardware_keycodes that are part of the GdkEventKey for each key that is pressed, 
and then create a composite value and pass that value to GenericSalLayout::LayoutText() and map it 
to the glyph value (again a non-standard value but which is part of a fontfile I have generated).
Where would I intercept the key_press_event and key_release_event of the GtkTextView before 
converting it to the OUString and passing it  to GenericSalLayout::LayoutText() ?
-a