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nit_fader: make fading steps configurable

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Fixes #3633
This commit is contained in:
Norman Feske 2020-01-30 15:20:17 +01:00 committed by Christian Helmuth
parent c25de5dba3
commit 0bffac6c98
1 changed files with 19 additions and 1 deletions
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20
repos/gems/src/server/nit_fader/main.cc
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@ -443,6 +443,13 @@ struct Nit_fader::Main
unsigned long alpha = 0;
unsigned long fade_in_steps = 0;
unsigned long fade_out_steps = 0;
bool initial_fade_in = true;
unsigned long initial_fade_in_steps = 0;
Genode::uint64_t curr_frame() const { return timer.elapsed_ms() / PERIOD; }
Genode::uint64_t last_frame = 0;
@ -499,10 +506,21 @@ void Nit_fader::Main::handle_config_update()
if (config_xml.has_attribute("alpha"))
config_xml.attribute("alpha").value(new_alpha);
fade_in_steps = config_xml.attribute_value("fade_in_steps", 20U);
fade_out_steps = config_xml.attribute_value("fade_out_steps", 50U);
initial_fade_in_steps = config_xml.attribute_value("initial_fade_in_steps", fade_in_steps);
/* respond to state change */
if (new_alpha != alpha) {
int const steps = (new_alpha > alpha) ? 20 : 50;
bool const fade_in = (new_alpha > alpha);
int const steps =
fade_in ? (initial_fade_in ? initial_fade_in_steps : fade_in_steps)
: fade_out_steps;
initial_fade_in = false;
nitpicker_session.fade(280*new_alpha, steps);
alpha = new_alpha;