[Devel] Re: OTLBuffer

[Owen Taylor]

On Fri, 2004-07-16 at 18:26, Lars Knoll wrote:
> Hi Owen,
> 
> On Friday 16 July 2004 22:34, Owen Taylor wrote:
> [....]
> > Then I modified the TT_GSUB_Apply_String() and TT_GPOS_Apply_String
> > to take a PangoOTBuffer and got rid of the separate TTO_GSUB_String
              OTLBuffer, of course.

> > and TTO_GPOS_Data structures.
> 
> Sounds good. I guess the OTBuffer contains positioning information as well?

Yes. Basically, it contains two buffers of glyph data that are swapped
between when applying GSUB lookups and a single buffer where position
data is written during GPOS.

    OTL_GlyphItem  in_string;
    OTL_GlyphItem  out_string;
    OTL_Position   positions;

> > My hope was that doing it this way is going to be efficient and flexible
> > enough to use for Pango, for Qt, and for other consumers. What do
> > people think? Should I look at what would be required to merge this
> > into the otlayout module?
> 
> Please do. I'd love to see a merge of our efforts into one codebase (ie. 
> otlayout). Judging from the few minutes I looked at the code it seems as if 
> some work is still required to finish the otlayout module and make it really 
> usable. If there is need, I'd be willing to help with implementing and 
> testing.

As far as I know, the otlayout module is basically in the state
described in:

 http://www.freetype.org/pipermail/devel/2003-August/009608.html

That is, it's the FreeType-1.x code adapted to be standalone but not
really tested and without any of the patches from

 http://people.redhat.com/otaylor/opentype-patches/

I guess the question is whether David is OK with the otlayout module
being picked up and adapted to fit the needs of Pango and Qt.

If so, I think I can find a couple of days to merge it with the current 
Pango version (*), and then perhaps you can take a look at it from the
Qt perspective.

Regards,
                                                Owen

P.S. - turns out my subscription to address@hidden was set to nomail
       and the archives are not working, so if anyone else replied to
       my mail just to the list I'd appreciate if they could forward
       me a copy.

(*) The way I'd probably do this is start from the ftxgsub.c, etc, files
    from Pango and redo the changes that David made, since the 
    ft1 => Pango change is huge while the ft1 => otlayout change is
    small.

signature.asc
Description: This is a digitally signed message part