Hi,
consider the following example code (Vala, compile with "valac --pkg
clutter-1.0 -X -lm test.vala"):
"""
using Clutter;
void main(string[] args) {
Clutter.init(ref args);
var stage = new Stage();
stage.hide.connect(Clutter.main_quit);
var actor = new Actor();
actor.background_color = Color.from_string("#f00");
actor.width = 100;
actor.height = 100;
var animation = new Clutter.PropertyTransition("opacity");
animation.repeat_count = -1;
animation.auto_reverse = true;
animation.set_interval(new Interval.with_values(typeof(int), 0, 255));
animation.duration = 1000;
actor.add_transition("animation", animation);
stage.add_child(actor);
stage.show();
Clutter.main();
}
"""
It creates a red rectangle and loop-fades it in and out.
On GNOME Shell, i5-2400 CPU @ 3.10GHz × 4, GeForce GTX 550 Ti, nVidia
proprietary driver, running this program results in massive additional
CPU usage:
gnome-shell: 10%
Xorg: 6%
The program itself: 5%
vs. gnome-shell and Xorg sitting close to zero without the program
running.
What is going on here? Is that "normal" performance or do I have a
mistake in my code? I tested on two other machines with different
hardware and Mint/Cinnamon instead of GNOME Shell, but with similar
results. Somehow, I find it difficult to believe that fading a rectangle
in and out requires 20% of a modern CPU.
Thanks in advance & best regards
- Philipp
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