On Wed, Mar 21, 2018 at 10:17 AM, Emmanuele Bassi <eba...@gmail.com> wrote:
> On 20 March 2018 at 14:06, Kian Karas <kian.karas....@gmail.com> wrote: > >> Hi smart people >> >> I just introduced animation, in the form of a GtkSpinner, to my >> application >> for the first time. When the spinner is animating, the application takes >> up >> 45 % of the CPU resources (the application is otherwise idle at 0-2,6 %). >> The CPU is a single core ARM Cortex-A7 running at 528 MHz (maximum). >> >> This seems like a lot of MIPS for rotating an image of approximately 20x20 >> px. >> >> > The rotation is performed through CSS, in order to be stylable by themes; > this means that the CSS state has to be invalidated in order to recompute > the next frame, and this is there the cost lies. > > Of course, 45% is a pretty big chunk of a core, so it's indeed problematic > on single core, low performance devices. It's going to be the case for > every animation involving CSS, though, so you may elect to either disable > animations on your platform, or use a static placeholder image. There's > also the option of using a theme that does not have as many states for the > spinner animation, thus causing fewer invalidations. > > I'm new to GTK (and CSS). Thus, I don't know the option you mention in above last sentence. Do you know of a source where I can learn about doing that? I mean, is there are tutorial touching on the spinner animation? It's for an embedded system, so I do not need support for different themes. Thus, unless I can figure out how to do above, I'll just make my own progress indication using slower update of a GtkImage (cycling through different images). We are actively working to fix the issue on GTK 4, but changing the CSS > subsystem has the potential of breaking GTK 3 applications, so it's not on > the roadmap, outside of low impact optimizations. > > Ciao, > Emmanuele. > > -- > https://www.bassi.io > [@] ebassi [@gmail.com] > _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
