Performance hit while working with screen depth 16

[Tomeu Vizoso]

On Mon, Jul 13, 2009 at 11:56, shivaprasad javali<jbsp72 at gmail.com> wrote:
> @ James
> I have attached my script to change the screen depth.
>
> @Tomeu
> Is there any possiblity of Sugar changing its default depth to 24  in the
> feature? By what you say it seems like this is a problem with sugar. So is
> it acceptable for my Activity to change the screen depth so that it runs
> faster?

It has nothing to do with Sugar but rather with how the system where
Sugar runs is configured. If you run GNOME on the XO with the server
at 16bits, you will notice the same effect.

Regards,

Tomeu

> On Mon, Jul 13, 2009 at 3:10 PM, Tomeu Vizoso <tomeu at sugarlabs.org> wrote:
>>
>> On Mon, Jul 13, 2009 at 11:24, James Cameron<quozl at laptop.org> wrote:
>> > On Mon, Jul 13, 2009 at 02:08:13PM +0530, shivaprasad javali wrote:
>> >> Sorry, I didn't understand the question. If you are talking about where
>> >> my
>> >> activity is for you to download, I am sorry I cannot provide you the
>> >> activity
>> >> itself.
>> >
>> > No, I wasn't asking about the activity.
>> >
>> >> If you are asking which file I changed to get the screen depth of the
>> >> XO to be
>> >> 24, it is the xorg.conf file present at /etc/X11.
>> >
>> > Yes, I was asking about your small script.  Can you provide your small
>> > script that changes teh screen depth and restarts X?
>>
>> Btw, the issue of depth transformations have been known in the Geode
>> for quite some time. We didn't switched to 24bpp because of the amount
>> of memory available.
>>
>> AFAIR the problem was that Cairo has no 16bit surfaces on which we
>> could work, so we use 32 (or is it 24?) and those need to be converted
>> by the X server. I have heard a rumour about someone (OpenMoko?
>> Maemo?) having invested resources in adding 16bit surfaces to Qt so it
>> ran properly on their hardware.
>>
>> Just found this after some googling:
>>
>> http://ariya.blogspot.com/2008/08/qt-44-and-maemo.html
>>
>> Regards,
>>
>> Tomeu
>>
>> > --
>> > James Cameron    mailto:quozl at us.netrek.org     http://quozl.netrek.org/
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