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Last updated at 4:02 am UTC on 4 August 2017
Is a subclass of CharacterScanner

A CompositionScanner measures text and determines where line breaks.
Given a rectangular zone on input, it is used to split text in horizontal lines, and produce information about those lines on output (at which index a line starts/stops, which vertical space does the line require, which horizontal space if left for adjusting inter-word spacing, etc...)