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Issues that this engine needs to handle:
- Picking the right character based on language/character
- Composition of combining diacriticals - should use precomposed
diacriticals when possible
- Finding word/line/breaks
For each sequence of character + combining marks
- Find combined representations from most combined to least combined.
- If there are particular characters for this combination, use
them, otherwise
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Ligature table per font.
Pick fonts in order of preference according to LANG
Characterstics of western/basic:
Consistent LTR
No reordering
Many characters => one glyph
Character/Word/Line breaking dependent only on character properties
Issues
Accent placement for Greek, Vietnamese
How do we handle a case where lang == en_US, we have a glyph
combination with a combined form in iso-8859-2 but not
in iso-8859-1?
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