Knut wrote:
> Can you please remind me why SMuFL aims to generally stay away from zero
> width side bearings and negative spacing. I seem to remember there was
> a reliability reason for this.
I think you mean zero-width glyphs, rather than zero-width side bearings (which is of course typically the recommendation for the vast majority of SMuFL glyphs).
You're quite right that we avoid zero or negative advance widths in SMuFL because of unreliability. How different renderers handle zero and negative width glyphs varies wildly, and it makes the behaviour of a given glyph on different operating systems or even within different applications very difficult to predict.
In particular, one good reason to avoid negative width glyphs is because "...glyph widths are unsigned integers, so if you have inserted a glyph with negative width, it will generally be interpreted as being a very large positive width rather than a small negative one." (From
http://forum.fontlab.com/index.php?topic=5838.0)
Daniel
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