Re: [ft] Misaki Mincho metrics issues

[Nikolay Sivov]

On 23.10.2015 1:07, Lawrence D'Oliveiro wrote:
> On Fri, 23 Oct 2015 00:35:07 +0300, Nikolay Sivov wrote:
>
> > I have some troubles with Misaki Mincho font (misakimn.ttf) [1],
> > regarding embedded bitmaps metrics.
> ...
> > The question is mostly if it's reasonable to have some kind of
> > workaround for that in freetype itself, like ignoring descender
> > entirely in such cases or something else?
>
> Or just ignore the bitmaps metrics. Bitmaps are there as a rendering
> optimization, they’re not supposed to disagree with the scalable
> metrics.

Thing is that this font is not reported as scalable by freetype, I think 
this logic kicks in:

---
      /* Check the scalable flag based on `loca'. */
      if ( !ttface->internal->incremental_interface &&
           ttface->num_fixed_sizes                  &&
           face->glyph_locations                    &&
           tt_check_single_notdef( ttface )         )
      {
        FT_TRACE5(( "tt_face_init:"
                    " Only the `.notdef' glyph has an outline.\n"
                    "             "
                    " Resetting scalable flag to FALSE.\n" ));

        ttface->face_flags &= ~FT_FACE_FLAG_SCALABLE;
      }
---

Initially scalable flag is set on load of course, because rudimentary 
'glyf' table is present. So as long as FT_IS_SCALABLE is 0 it should be 
considered purely bitmap from client point of view in my opinion.

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