dcpomatic/test/font_id_allocator_test.cc, branch fixlibdir

Simplify the FontIDAllocator a lot (#2827).

2024-06-11T07:52:28Z

This is at the expense of forward compatibility, and the need to re-examine subtitle content (losing custom fonts as we do so). But it does mean that the code is simpler, and there's not this weird growth of IDs where a DCP gets imported with some font, and then the ID becomes 0_font, and if you do it again it's 0_0_font, and so on.

Fix font ID allocation from DCP when there are subs and ccaps using the same IDs (#2822).

2024-06-07T19:09:03Z

Previously we would always use _id as a disambiguated ID for every case.

Fix DCP content font ID allocation to cope with DCPs that have multiple fonts

2023-10-15T07:10:18Z

with the same name in the same reel (#2600). Previously we had this id_for_font_in_reel() which would give an ID of N_font-ID. This means we got duplicate font IDs. Here we replace that method with FontAllocator, which gives an ID of N_font-ID for the first font and M_font-ID, where M is a number higher than the highest reel index. The idea is to support the required new IDs without breaking exisiting projects. There is some documentation of how it works in doc/design/fonts