[squeak-dev] Fwd: Problem with fonts on Linux with compositing activated

Maybe it occurs more often with nice fonts, but it actually is a combined VM/image problem.

The VM prefers a 32 bit X visual (with alpha channel) over a 24 bit one. If a compositing window manager is used, the alpha channel is used for transparency, but the image generally does not care about the alpha channel in its frame buffer.

The olpc branch in the SVN repository has a fix for that, see

http://tinyurl.com/6fhqmw

- Bert -

Am 17.08.2008 um 17:56 schrieb Ken Causey:

On Sun, 2008-08-17 at 17:04 +0200, Bert Freudenberg wrote:

Am 17.08.2008 um 11:29 schrieb laurent laffont:

Hi,

I've switched to KDE4 and played with composite rendering.  With
last squeak dev images some fonts are not rendered: it seems to be
interpreted as a transparent region by the composite manager (see
screenshot). I've tested this on my two debian boxes.

This problem is not present in sq3.9.1-7075dev08.07.1 image, so I
suppose it's due to NiceFont integration ?

Maybe it occurs more often with nice fonts, but it actually is a
combined VM/image problem.

The VM prefers a 32 bit X visual (with alpha channel) over a 24 bit
one. If a compositing window manager is used, the alpha channel is
used for transparency, but the image generally does not care about the
alpha channel in its frame buffer.

Does that mean there is some core location(s) where the alpha channel
needs to be defaulting to full opacity but currently it is not?

Yes, that is where the transparent areas are under a compositing window manager. I also remember partly translucent menus in (old versions of) Croquet, and having to fix the alpha channel after taking a screenshot.

- Bert -

The olpc branch in the SVN repository has a fix for that, see

http://tinyurl.com/6fhqmw

- Bert -

Hi,

I will remove NiceFonts in future squeak-dev until these problems are fixed.

On Mon, Aug 18, 2008 at 8:59 AM, Mariano Martinez Peck
<[hidden email]> wrote:
> Hi! I have the same problem here. I am using Ubuntu 8.04 with compiz and an
> ati video driver. With sq3.10.2-7179dev08.08.1.image it works perfect, but
> with sq3.9.1-7075web08.06.1.image I have this error.
>
> I tried changing color depth to 16, 24 and 32, but it doesnt work.
>
> Bert: Sorry but I didn't understand your comment. Is there a fix? How can I
> do it? Can someone help me?
>
> many thanks,
>
> mariano
>
>
> On Sun, Aug 17, 2008 at 1:06 PM, Bert Freudenberg <[hidden email]>
> wrote:
>>
>> Am 17.08.2008 um 17:56 schrieb Ken Causey:
>>
>>> On Sun, 2008-08-17 at 17:04 +0200, Bert Freudenberg wrote:
>>>>
>>>> Am 17.08.2008 um 11:29 schrieb laurent laffont:
>>>>
>>>>> Hi,
>>>>>
>>>>> I've switched to KDE4 and played with composite rendering.  With
>>>>> last squeak dev images some fonts are not rendered: it seems to be
>>>>> interpreted as a transparent region by the composite manager (see
>>>>> screenshot). I've tested this on my two debian boxes.
>>>>>
>>>>> This problem is not present in sq3.9.1-7075dev08.07.1 image, so I
>>>>> suppose it's due to NiceFont integration ?
>>>>
>>>>
>>>> Maybe it occurs more often with nice fonts, but it actually is a
>>>> combined VM/image problem.
>>>>
>>>> The VM prefers a 32 bit X visual (with alpha channel) over a 24 bit
>>>> one. If a compositing window manager is used, the alpha channel is
>>>> used for transparency, but the image generally does not care about the
>>>> alpha channel in its frame buffer.
>>>
>>> Does that mean there is some core location(s) where the alpha channel
>>> needs to be defaulting to full opacity but currently it is not?
>>
>> Yes, that is where the transparent areas are under a compositing window
>> manager. I also remember partly translucent menus in (old versions of)
>> Croquet, and having to fix the alpha channel after taking a screenshot.
>>
>> - Bert -
>>
>>>> The olpc branch in the SVN repository has a fix for that, see
>>>>
>>>> http://tinyurl.com/6fhqmw
>>>>
>>>> - Bert -
>>>
>>
>>
>>
>>
>
>
>
>
>

--
Damien Cassou
Peter von der Ahé: «I'm beginning to see why Gilad wished us good
luck». (http://blogs.sun.com/ahe/entry/override_snafu)

> Is there any way of "uninstalling" a package through Universe ? I mean, can
> I uninstall NiceFonts for example ?

You can't uninstall it but you can use an older version of the image.
Download it from http://gforge.inria.fr/frs/?group_id=1299. For
example, you can download
http://gforge.inria.fr/frs/download.php/5299/sq3.9.1-7075dev08.07.1.zip.

--

Damien Cassou
Peter von der Ahé: «I'm beginning to see why Gilad wished us good
luck». (http://blogs.sun.com/ahe/entry/override_snafu)