[smufl-discuss] Re: Glyph Registration and Graphical Metadata

[dspreadbury]

Joe wrote:

> > Canvas appears to be even more basic than that, though what is not
clear
> > from the specification is whether or not text in Canvas elements is
> > subject to the same text shaping etc. that text elsewhere in HTML is
> > subject to.
>
> Yes, it can be scaled, etc.

Is it shaped using the same shaper etc. as regular text? If so, then
things like ligatures might "just work" because I believe it's the job of
the shaper to do that kind of glyph substitution.

> I can testify that SVG does provide full bounding box calculation,
> because Noteflight absolutely relies on that. The bounding box API
> is generic to all SVG graphical elements rather than being text-
> specific, which is probably how you missed it. The SVG spec is also
> organized in a very complicated way with many interface definitions
> whose relationship to everything else in the spec is far from clear.
>
> Here's the culprit:
> http://www.w3.org/TR/SVG/types.html#__svg__SVGLocatable__getBBox

Right, that makes sense. Well, at least you can measure glyphs reliably,
then! This confirms the requirement for a separate file of some kind that
provides information about stem connections, etc. Hopefully we can find a
way to generate such a file relatively automatically via UFO or a dump of
the OpenType feature tables.

Daniel

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