[HarfBuzz] Don't render control characters?

Konstantin Ritt ritt.ks at gmail.com
Wed Mar 5 17:30:27 PST 2014

Good catch ;) I was wandering why these ones are expected to be handled by
the user...

+1 for having a flag for this. As for making it a separate flag, I'm not
When I was requesting PRESERVE_DEFAULT_IGNORABLES flag, I did care about
two use-cases:
1) Symbol encoding support - thing that is used to encode various crap in
the 32..255 character code range, and thus might override U+00AD [SHY],
which is of Default_Ignorable property;
2) A "show document structure" rendering option, where some normally
invisible characters are handled by a special font (i.e. to visualize some
control characters, BiDi format characters, objects, etc.)
W/o some "3)" I have no strong feeling that we need a separate flag for
handling GC=Cc.


2014-03-06 1:05 GMT+02:00 Behdad Esfahbod <behdad at behdad.org>:

> And we can have a separate flag for preserving them, doesn't have to be the
> same flag that is for Default_Ignorables.
> On 14-03-05 03:04 PM, Behdad Esfahbod wrote:
> > Any objection to not rendering Unicode GC=Cc, same way that we don't
> render
> > Default_Ignorables?  That's the U+0000..001F and U+007F and
> U+0080..U+009F
> > ones.  In Chromium that would save us some trouble as currently we have
> to
> > rewrite those to make sure we don't get any glyph for them.
> >
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