OpenType is a table-based computer font format separating glyph representations, character mapping, measurements, naming metadata and optional layout rules. Its cmap table selects default glyph indices for encoded text characters; substitution and positioning tables support more elaborate text shaping.
An OpenType computer font can contain TrueType outlines or Compact Font Format outlines, and the specification also provides for bitmap and other glyph representations. The file format therefore does not prescribe a single kind of outline geometry. Extensions such as .ttf and .otf are useful conventions, but the actual table contents determine the available representation.[ref]
This organization lets one system answer separate questions: which glyph represents this text, how much space should it occupy, and how should it be drawn at this size? A language's contextual forms can change the first answer without changing the original Unicode text.

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  1. Computer font
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