Re: Cut-outs

Erik wrote:

> Not that it is a big issue, but it just seems a bit curios to me: a lot 
of work has obviously 
> been put into the SMuFL specification and it is generally very 
consistent in glyph registration 
> and how glyphs relate to the font baseline and horizontal origin. Thus 
it is a bit surprising 
> that the cut-outs don’t follow the same logic.

We tried to be pragmatic more than we tried to be consistent, if you see 
what I mean. You're right that most applications would be able to handle 
cut-outs being relative to the glyph origin rather than the bottom 
left-hand corner of the glyph, but we chose that approach based on 
community discussion and the sense that the glyph bbox would be easier to 
get hold of in a wider variety of APIs, and my personal feeling is that 
there's not enough to gain by proposing changing this now, though perhaps 
to date the only application to have actually implemented the use of 
cut-outs to any great degree is Dorico, so it might not inconvenience a 
huge number of implementers. (It would inconvenience us, though!)

So I think we should leave things as they are, but if you strongly feel 
that the community should consider a change in this area, please do raise 
an issue at https://www.github.com/w3c/smufl/issues/ and we can discuss it 
for the future.

Thanks!

Daniel



From:   Erik Ronström <erik@ompom.se>
To:     Daniel Spreadbury <D.Spreadbury@steinberg.de>
Cc:     public-music-notation-contrib@w3.org
Date:   09/04/2018 13:21
Subject:        Re: Cut-outs



> We use the glyph bounding box because it is typically simple to get hold 
of in whatever API you might be using to gather information about the 
glyph. Not all APIs seem to provide more detailed access to glyph metrics, 
whereas the bounding box appears to be pretty universally available.

I see, but wouldn’t the glyph origin be even simpler to ”get hold of”, 
always being [0, 0]? :)

Not that it is a big issue, but it just seems a bit curios to me: a lot of 
work has obviously been put into the SMuFL specification and it is 
generally very consistent in glyph registration and how glyphs relate to 
the font baseline and horizontal origin. Thus it is a bit surprising that 
the cut-outs don’t follow the same logic.

Erik






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