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Split out the check for accent color luminance.

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This commit is contained in:
wolfbeast 2017-07-19 16:24:08 +02:00 • committed by Roy Tam
commit 41ee5136f4
2 changed files with 20 additions and 8 deletions
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20
widget/windows/nsLookAndFeel.cpp
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@ -762,6 +762,16 @@ nsLookAndFeel::GetAccentColor(nscolor& aColor)
return rv;
}
bool
nsLookAndFeel::AccentColorIsDark(nscolor aColor)
{
float luminance = (NS_GET_R(aColor) * 2 +
NS_GET_G(aColor) * 5 +
NS_GET_B(aColor)) / 8;
return luminance <= 128;
}
/* static */ nsresult
nsLookAndFeel::GetAccentColorText(nscolor& aColor)
{
@ -775,15 +785,9 @@ nsLookAndFeel::GetAccentColorText(nscolor& aColor)
// a background that has the accent color to have good contrast with
// the accent color. Windows itself uses either white or black text
// depending on how light or dark the accent color is. We do the same
// here based on the luminance of the accent color with a threshhold
// value and formula that are specified in the UWP guidelines.
// See: https://docs.microsoft.com/en-us/windows/uwp/style/color
// here based on the luminance of the accent color.
float luminance = (NS_GET_R(accentColor) * 2 +
NS_GET_G(accentColor) * 5 +
NS_GET_B(accentColor)) / 8;
aColor = (luminance <= 128) ? NS_RGB(255, 255, 255) : NS_RGB(0, 0, 0);
aColor = AccentColorIsDark(accentColor) ? NS_RGB(255, 255, 255) : NS_RGB(0, 0, 0);
return NS_OK;
}