WebKit font problems

[Martin Sourada]

Hi,

I though this bug [1] I've just filled against WebKit might be of some
interest to you. In short, WebKit shows blank space instead of some
characters, I noticed Japanese, Chinese and Korean to be the ones
affected.

I am not sure if it's WebKit or Fedora-way-of-font-handling issue, so I
though I might let you know as well... (I hope I am not just causing
noise :-D)

Thanks,
Martin

References:
[1] https://bugzilla.redhat.com/show_bug.cgi?id=448693

[Qianqian Fang]

can you install wqy-zenhei-fonts or ttf-arphic-uming and tell us
if the problem goes away.

Qianqian

Martin Sourada wrote:
> Hi,
>
> I though this bug [1] I've just filled against WebKit might be of some
> interest to you. In short, WebKit shows blank space instead of some
> characters, I noticed Japanese, Chinese and Korean to be the ones
> affected.
>
> I am not sure if it's WebKit or Fedora-way-of-font-handling issue, so I
> though I might let you know as well... (I hope I am not just causing
> noise :-D)
>
> Thanks,
> Martin
>
> References:
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=448693
>
> Fedora-fonts-list mailing list
> [e-mail]
> https://www.redhat.com/mailman/listinfo/fedora-fonts-list

[Martin Sourada]

I didn't noticed you've sent it to me (and CCed the font-list), so resending my answer to font-list now...

On Wed, 2008-05-28 at 10:01 -0400, Qianqian Fang wrote:
> can you install wqy-zenhei-fonts or ttf-arphic-uming and tell us
> if the problem goes away.
>
> Qianqian

Installing wqy-zenhei-fonts does not solve the issue, ttf-arphic-uming
does not seem to be in Fedora :-/

Martin

PS: I've already subscribed ;-)

[Nicolas Mailhot]

It'd be interesting to know what lib webkit uses for text layouting.
Its root are in KDE and KDE tends to use QT's less than ideal
layouting engine. OTOH GTK apps tend to use pango. If gtk-webkit uses
somethingin the middle it's not surprising it behaves stangely.

[Martin Sourada]

I didn't noticed you sent it to me directly (and CCed the fonts list), so resending to fonts-list...

On Wed, 2008-05-28 at 17:08 +0200, Nicolas Mailhot wrote:
> It'd be interesting to know what lib webkit uses for text layouting.
> Its root are in KDE and KDE tends to use QT's less than ideal
> layouting engine. OTOH GTK apps tend to use pango. If gtk-webkit uses
> somethingin the middle it's not surprising it behaves stangely.

AFAIK, WebKit-gtk uses pango as well...

$ rpm -q --requires WebKit-gtk | grep pango
libpango-1.0.so.0  
libpangocairo-1.0.so.0

Martin

[Martin Sourada]

On Wed, 2008-05-28 at 17:08 +0200, Nicolas Mailhot wrote:
> It'd be interesting to know what lib webkit uses for text layouting.
> Its root are in KDE and KDE tends to use QT's less than ideal
> layouting engine. OTOH GTK apps tend to use pango. If gtk-webkit uses
> somethingin the middle it's not surprising it behaves stangely.

I have some new info from the webkit guys. They use either pango or
fontconfig backend (in fedora we select the pango one), but both suffer
the same issue. The problem is believed to be in font fallback code. I
believe you know more about that stuff than I do, so I figured you might
be able to help. Here are the relevant webkit bugs (one of which has
even an ugly workaround patch):

https://bugs.webkit.org/show_bug.cgi?id=16792
https://bugs.webkit.org/show_bug.cgi?id=18546

Martin