Hi Werner, To make `hdmx` easily accessible, I propose the following.
1) Use internal FT_LOAD_ADVANCE_ONLY in truetype to quickly exit if `hdmx` is deemed usable and size matches. 2) "quickly" means from tt_loader_init. We will relocate the bulk of the `hdmx` code there from compute_glyph_metrics. 3) INSTCTRL needs to be confined to CVT as OpenType specs require. Do you know how to make INSTCTRL no-op anywhere except CVT? Otherwise it is rather strange to reconsider each time TT_RunIns runs under v40. Thanks Alexei
