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Minimum luminance for backlight in dark scenes (#646)

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* Include miminum luminance

* Add luminance minimum

* Add luminance minimum

* fixed missing ;

* Add luminance minimum

* Add luminance minimum check

Check if luminance mimimum is other than default

* Add luminance minimum

* Add luminance minimum

* Add luminance minimum

* Add luminance minimum

* Add luminance minimum

* Safe luminance calculation


Former-commit-id: 35a762b18b473a333155acba7a00894204400076
This commit is contained in:
Funatiq
2016-05-23 00:00:48 +02:00
committed by brindosch
parent e944ce46cd
commit f8b724f9f9
9 changed files with 69 additions and 10 deletions
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24
libsrc/utils/HslTransform.cpp
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@@ -4,13 +4,15 @@
HslTransform::HslTransform() :
_saturationGain(1.0),
_luminanceGain(1.0)
_luminanceGain(1.0),
_luminanceMinimum(0.0)
{
}
HslTransform::HslTransform(double saturationGain, double luminanceGain) :
HslTransform::HslTransform(double saturationGain, double luminanceGain, double luminanceMinimum) :
_saturationGain(saturationGain),
_luminanceGain(luminanceGain)
_luminanceGain(luminanceGain),
_luminanceMinimum(luminanceMinimum)
{
}
@@ -38,9 +40,19 @@ double HslTransform::getLuminanceGain() const
return _luminanceGain;
}
void HslTransform::setLuminanceMinimum(double luminanceMinimum)
{
_luminanceMinimum = luminanceMinimum;
}
double HslTransform::getLuminanceMinimum() const
{
return _luminanceMinimum;
}
void HslTransform::transform(uint8_t & red, uint8_t & green, uint8_t & blue) const
{
if (_saturationGain != 1.0 || _luminanceGain != 1.0)
if (_saturationGain != 1.0 || _luminanceGain != 1.0 || _luminanceMinimum != 0.0)
{
uint16_t hue;
float saturation, luminance;
@@ -53,9 +65,11 @@ void HslTransform::transform(uint8_t & red, uint8_t & green, uint8_t & blue) con
saturation = s;
float l = luminance * _luminanceGain;
if (l < _luminanceMinimum)
l = _luminanceMinimum;
if (l > 1.0f)
luminance = 1.0f;
else
else
luminance = l;
hsl2rgb(hue, saturation, luminance, red, green, blue);