dcpomatic/src/lib/font_id_allocator.cc, branch split

Account for split branch in libdcp.

2023-12-05T00:59:44Z

Always add a font with an empty ID (#2649).

2023-11-16T23:24:35Z

It's not just subtitle files with no that can have subtitles without a specified font. In particular, DoM makes a single space subtitle with no font spec when it creates filler subtitles in multi-reel DCPs.

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