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unicode-combine: remove utf8proc dependency

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We only used utf8proc to try to pre-compose a glyph from a base and
combining character.

We can do this ourselves by using a pre-compiled table of valid
pre-compositions. This table isn't _that_ big, and binary searching it
is fast.

That is, for a very small amount of code, and not too much extra RO
data, we can get rid of the utf8proc dependency.
This commit is contained in:
Daniel Eklöf 2020-05-02 17:29:00 +02:00
parent 8389c76549
commit d945b68b73
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13 changed files with 34934 additions and 40 deletions
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6
meson_options.txt
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@ -1 +1,5 @@
option('unicode-combining', type: 'feature', value: 'auto', description: 'Perform unicode combining')
option('unicode-max-combining-chars', type: 'integer', value: 2,
description: 'Maximum number of combining characters to track per cell. A value of 0 completely disables unicode combining (this reduces the runtime memory footprint)')
option('unicode-precompose', type: 'boolean', value: true,
description: 'Convert decomposed characters to precomposed. Ignored if "unicode-combining" has been disabled')