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by raphlinus 2257 days ago
Most fonts will include some combinations (generally Latin-1), but not all that are encoded in Unicode. A proper shaping library such as Harfbuzz will navigate all possibilities, including composed and decomposed Unicode input, and fonts with both precomposed characters and separate glyphs for combining marks. Getting all this right would be highly challenging for a small, simple library, as it requires fine-grained knowledge of both Unicode and OpenType.