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AudioApplet: Make the slider exponential for finer volume control

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The volume slider was linear, which is not ideal for an audio volume 
control. Perceived volume would not change much within 30-100% range
and would change in leaps within 0-30% range where the resolution is
not sufficient for fine grained control.

The simplest solution is to bring the value into 0.0-1.0 range and 
square it to obtain an exponential curve. This is a decent 
approximation of the logarithmic taper used in audio potentiometers.
This commit is contained in:
Marcin Gasperowicz 2020-10-14 17:37:15 +02:00 committed by Andreas Kling
parent 5245277369
commit 3039c36836
Notes: sideshowbarker 2024-07-19 01:53:57 +09:00 
Author: https://github.com/nooga
Commit: https://github.com/SerenityOS/serenity/commit/3039c368364
Pull-request: https://github.com/SerenityOS/serenity/pull/3766
1 changed files with 4 additions and 2 deletions
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6
MenuApplets/Audio/main.cpp
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@ -108,7 +108,8 @@ public:
m_slider->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fill);
m_slider->on_value_changed = [&](int value) {
int volume = clamp((20 - value) * 5, 0, 100);
m_audio_client->set_main_mix_volume(volume);
float volume_log = ((volume / 100.0f) * (volume / 100.0f)) * 100.0f;
m_audio_client->set_main_mix_volume(volume_log);
update();
};
@ -147,7 +148,8 @@ private:
if (m_audio_muted)
return;
int volume = clamp(m_audio_volume - event.wheel_delta() * 5, 0, 100);
m_audio_client->set_main_mix_volume(volume);
float volume_log = ((volume / 100.0f) * (volume / 100.0f)) * 100.0f;
m_audio_client->set_main_mix_volume(volume_log);
m_slider->set_value(20 - (volume / 5));
update();
}