[shaping] add support for custom letter and word spacing #165
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This is a revisited version of #90.
The proposed API consists of two methods
Output.AddWordSpacing()
andOutput.AddLetterSpacing()
and a convenient functionAddSpacing
accepting a slice ofOutput
s.I've exported the
Output
methods so that it may be used by external implementation ofRunIterator
.Implementation note : by registering the letter spacing in a new
Glyph
field, the line wrapper is able to trim edge spacing on its own, without requiring the user to "clean up" the runs after wrapping.What do you think ?