[Fontconfig-bugs] [Bug 92981] Wrong legacy sub-pixel filter number leading to bad filtering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92981

Behdad Esfahbod <freedesktop at behdad.org> changed:

           What    |Removed                     |Added
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                 CC|                            |freedesktop at behdad.org,
                   |                            |wl at gnu.org

--- Comment #5 from Behdad Esfahbod <freedesktop at behdad.org> ---
(In reply to Benjamin Cama from comment #4)
> (In reply to Akira TAGOH from comment #3)
> > That looks to me like explaining it so.
> 
> Explaining it? It just states that the interface in fontconfig has been
> added because one was added in freetype. It does not say anything about
> being equal, but it *may* be interpreted like so.
> 
> But I admit I did not find any other occurrence of almost-matching interface
> (quick search only). So this may only be a coincidence…
> 
> > > The right solution is to define very well what is your interface
> > > regarding these values and their relation to freetype. If you keep on
> > > having different definitions, then I think several software would need
> > > fixing, like libXft. It would be a better idea to define a common and
> > > consistent interface
> > 
> > I'm afraid there are no plans to break API/ABI of fontconfig so far,
> > particularly for 2.x. even no real plans for fontconfig 3.
> 
> Is this an official statement from the fontconfig developers?

That's what the incumbent maintainer said, so yes.

> So, libraries
> using fontconfig and freetype should do the matching themselves? If so, then
> libXft would need a fix. I may do that if I find time.

Easier to fix remaining clients than to change something now and change every
other client...  Documentation would be nice though.

Alternatively, may I suggest, we change FreeType to recognize 3 as well as 16?

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