libdcp/src/subtitle_asset_internal.cc, branch add-validity

Improve handling of image subtitle IDs in XML (DoM bug #1965)

2021-04-16T20:49:35Z

When reading/writing the XML for image subtitles, we assumed that the content of the tag is just the ID of the PNG in the MXF, without any prefix. DoM bug #1965 mentions a DCP where this is not the case, and SMPTE 429-5-2009 has an example where there is urn:uuid: in the XML. This change makes DoM write this urn:uuid: prefix, and accept it if it's present (but not complain if it's not). If the urn:uuid: _is_ required in the field, it's a bit surprising that nobody has complained up to this point. Maybe nobody noticed, or nobody reported it. Cherry-picked from 098007a1ee6a46b6ff11398f94faff5c85951da4 in master.

Switch to UUIDs for Interop image subtitle identification (rather than indices). Basic and untested SMPTE image subtitle support.

2018-07-08T23:43:13Z

Basic interop bitmap writing.

2018-07-07T23:19:42Z

SubtitleString -> shared_ptr

2018-07-07T22:16:45Z

Fix missing HAlign/VAlign attributes in subtitles when their value is negative.

2018-01-13T21:18:24Z

Rework subtitle writing to fix incorrect output with

2016-10-06T23:02:47Z

in-line font changes (#952).