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bc42144642
If the "MMR" bit is set, the generic region decoding procedure just
uses ITU-T T.6 (2D CCITT), which we already have an implementation of.
In practice, this is used almost never in .jbig2 files and in none of
the PDFs I have.
The two files that do use MMR are:
1.) JBIG2_ConformanceData-A20180829/F01_200_TT9.jb2
2) 042_3.jb2 from the ghostpdl tests
The first uses an immediate _lossless_ generic region, which we don't
implement yet (but I think it should just forward to the normal
immediate generic region code? Not in this commit, though). The second
uses a regular immediate generic region, and we can decode it now:
Build/lagom/bin/image -o out.png \
path/to/ghostpdl/tests/jbig2/042_3.jb2
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