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Ladybird: Let WebContent know if the current system theme is dark

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This means we now actually respect @media (prefers-color-scheme: dark)
by default when in dark mode. :^)
This commit is contained in:
Andreas Kling 2023-04-29 18:35:06 +02:00 • committed by Jelle Raaijmakers
parent fd9b6878f6
commit 72195ade9d
3 changed files with 19 additions and 13 deletions
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13
Ladybird/main.cpp
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@ -113,3 +113,16 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
return event_loop.exec();
}
bool is_using_dark_system_theme(QWidget& widget)
{
// FIXME: Qt does not provide any method to query if the system is using a dark theme. We will have to implement
// platform-specific methods if we wish to have better detection. For now, this inspects if Qt is using a
// dark color for widget backgrounds using Rec. 709 luma coefficients.
// https://en.wikipedia.org/wiki/Rec._709#Luma_coefficients
auto color = widget.palette().color(widget.backgroundRole());
auto luma = 0.2126f * color.redF() + 0.7152f * color.greenF() + 0.0722f * color.blueF();
return luma <= 0.5f;
}