[maemo-developers] Maemo UI Development for N800/N810

[From: kumar lomash]

Hi Eero,

I tried reducing the hierarchy and it helped, but I am still trying to
reduce it further. Currently I am using 24 bit png (24 bit bmp converted to
png) images for all image widgets. Will it help if I use 8-bit bitmaps
(converted to png) to lighten the UI? Is there any other image format
supported by Maemo/GTK which would make it lighter?

Thanks for the help,
Lomash

On Fri, Mar 7, 2008 at 1:58 PM, Eero Tamminen <eero.tamminen at nokia.com>
wrote:

> Hi,
>
> ext kumar lomash wrote:
> > I have been developing GUI using GTK +2.0 and now I am facing some
> > performance issues. Let me first describe
> >
> > The implementation: -
> > The UI consists of layouts (GtkContainers) which have event box and
> image
> > widgets. At any given time only one of the four layouts is visible and
> the
> > user can select a layout at any given time. On an average each layout
> has 25
> > buttons (internally event boxes and image widgets). Every button has 3
> > states so there are 6 (3 event + 3 image) widgets for every button. A
> total
> > of 4 layouts make 600 widgets roughly at any given time.
> >
> > The Problem: -
> > Whenever user switches between layouts, I hide other layouts (hide the
> > containers) and show the selected layout. The problem is that it takes
> very
> > long to do these operations.
>
> You need to profile your application to see what is the bottleneck.
> I think you could do it even on x86 (e.g. using Valgrind/callgrind
> + Kcachegrind).
>
> If you have deep widget hierarchy, you could try reducing levels in it
> (deep widget hierarchies can greatly increase the number of signals
> needed to propagate changes).
>
>
> > Is there a better way of doing this? I used event boxes and image
> widgets in
> > place of gtkbuttons because I needed custom shaped buttons with custom
> > bitmaps over them.
>
>
>         - Eero
>
>
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