Fix #1899, #1922 (#1933)

Author: Lord-Grey

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Hue Bridge - Alternate certificate support
 - Linux: New DRM/KMS screen grabber with plane-based capture - not feature complete yet
 - Logging/Tracing: Introduced qlogging categories to enable dynamic tracing
+- Home Assistant: Dynamically set brightness for higher dynamic range (#1922)
 
 ---
 
@@ -41,6 +42,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - LED-devices are not retrying to establish connectivity, if supported by the device
   - LED-devices are resolving IP-addresses for API and UDP two times in sequence
   - LED-device updates queue up and let Hyperion crash (#1887)
+  - The color of the backlight threshold is green, not white/gray (#1899)
   - Install - Ubuntu 25.10 unable to install due to libcec package (#1934)
 
 ---

include/utils/RgbTransform.h

@@ -27,7 +27,7 @@ class RgbTransform
 	/// @param brightnessHigh The used higher brightness
 	/// @param temeprature The given color temperature (in Kelvin)
 	///
-	RgbTransform(double gammaR, double gammaG, double gammaB, double backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature);
+	RgbTransform(double gammaR, double gammaG, double gammaB, int backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature);
 
 	/// @return The current red gamma value
 	double getGammaR() const;
@@ -47,7 +47,7 @@ class RgbTransform
 	int getBacklightThreshold() const;
 
 	/// @param backlightThreshold New lower brightness
-	void setBacklightThreshold(double backlightThreshold);
+	void setBacklightThreshold(int backlightThreshold);
 
 	/// @return The current state
 	bool getBacklightColored() const;
@@ -93,7 +93,7 @@ class RgbTransform
 	///
 	/// @note The values are updated in place.
 	///
-	void applyGamma(uint8_t & red, uint8_t & green, uint8_t & blue);
+	void applyGamma(uint8_t & red, uint8_t & green, uint8_t & blue) const;
 
 	///
 	/// Apply Backlight the the given RGB values.
@@ -123,7 +123,7 @@ class RgbTransform
 	/// @param brightnessCompensation The used brightness compensation
 	/// @param temeprature apply the given color temperature (in Kelvin)
 	///
-	void init(double gammaR, double gammaG, double gammaB, double backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature);
+	void init(double gammaR, double gammaG, double gammaB, int backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature);
 
 	/// (re)-initilize the color mapping
 	void initializeMapping();	/// The saturation gain
@@ -133,8 +133,8 @@ class RgbTransform
 	/// backlight variables
 	bool _backLightEnabled;
 	bool _backlightColored;
-	double  _backlightThreshold;
-	double _sumBrightnessLow;
+	int  _backlightThreshold;
+	uint8_t  _sumBrightnessLow;
 
 	/// gamma variables
 	double _gammaR;

libsrc/hyperion/MultiColorAdjustment.cpp

@@ -159,6 +159,6 @@ void MultiColorAdjustment::applyAdjustment(std::vector<ColorRgb>& ledColors)
 		color.blue  = OB + RB + GB + BB + CB + MB + YB + WB;
 
 		adjustment->_rgbTransform.applyTemperature(color);
-		adjustment->_rgbTransform.applyBacklight(color.red, color.green, color.green);
+		adjustment->_rgbTransform.applyBacklight(color.red, color.green, color.blue);
 	}
 }

libsrc/leddevice/dev_net/LedDeviceHomeAssistant.cpp

@@ -401,8 +401,6 @@ bool LedDeviceHomeAssistant::powerOff()
 
 int LedDeviceHomeAssistant::write(const std::vector<ColorRgb>& ledValues)
 {
-	int retVal = 0;
-
 	QJsonObject serviceAttributes{ {ENTITY_ID, QJsonArray::fromStringList(_lightEntityIds)} };
 	ColorRgb ledValue = ledValues.at(0);
 
@@ -415,20 +413,18 @@ int LedDeviceHomeAssistant::write(const std::vector<ColorRgb>& ledValues)
 	_restApi->setPath(API_LIGHT_TURN_ON);
 	serviceAttributes.insert(RGB_COLOR, QJsonArray{ ledValue.red, ledValue.green, ledValue.blue });
 
-	int brightness = _brightness;
-
-	// Some devices cannot deal with a black color and brightness > 0
-	if (ledValue == ColorRgb::BLACK)
+	int brightness;
+	if (!_isBrightnessOverwrite)
 	{
-		brightness = 0;
+		brightness = qBound(0, qRound(0.2126 * ledValue.red + 0.7152 * ledValue.green + 0.0722 * ledValue.blue), 255);
 	}
-
-	// Add brightness attribute if applicable
-	if (brightness == 0 || _isBrightnessOverwrite)
+	else
 	{
-		serviceAttributes.insert(BRIGHTNESS, brightness);
+		brightness = _brightness;
 	}
 
+	serviceAttributes.insert(BRIGHTNESS, brightness);
+
 	if (_transitionTime > 0)
 	{
 		serviceAttributes.insert(TRANSITION, _transitionTime);
@@ -438,8 +434,8 @@ int LedDeviceHomeAssistant::write(const std::vector<ColorRgb>& ledValues)
 	if (response.error())
 	{
 		Warning(_log, "Updating lights failed with error: '%s'", QSTRING_CSTR(response.getErrorReason()));
-		retVal = -1;
+		return -1;
 	}
 
-	return retVal;
+	return 0;
 }

libsrc/leddevice/schemas/schema-homeassistant.json

@@ -53,7 +53,7 @@
       "type": "boolean",
       "format": "checkbox",
       "title": "edt_dev_spec_brightnessOverwrite_title",
-      "default": true,
+      "default": false,
       "required": true,
       "access": "advanced",
       "propertyOrder": 6

libsrc/utils/RgbTransform.cpp

@@ -1,20 +1,23 @@
-#include <QtCore/qmath.h>
 #include <utils/RgbTransform.h>
+
+#include <QtMath>
+#include <QtGlobal>
+
 #include <utils/KelvinToRgb.h>
 
 RgbTransform::RgbTransform()
 	: RgbTransform::RgbTransform(1.0, 1.0, 1.0, 0.0, false, 100, 100, ColorTemperature::DEFAULT)
 {
 }
 
-RgbTransform::RgbTransform(double gammaR, double gammaG, double gammaB, double backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature)
+RgbTransform::RgbTransform(double gammaR, double gammaG, double gammaB, int backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature)
 	: _brightness(brightness)
 	, _brightnessCompensation(brightnessCompensation)
 {
 	init(gammaR, gammaG, gammaB, backlightThreshold, backlightColored, _brightness, _brightnessCompensation, temperature);
 }
 
-void RgbTransform::init(double gammaR, double gammaG, double gammaB, double backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature)
+void RgbTransform::init(double gammaR, double gammaG, double gammaB, int backlightThreshold, bool backlightColored, uint8_t brightness, uint8_t brightnessCompensation, int temperature)
 {
 	_backLightEnabled = true;
 	setGamma(gammaR,gammaG,gammaB);
@@ -64,9 +67,9 @@ void RgbTransform::initializeMapping()
 		double gammaCorrectedValueB = qPow(normalizedValueB, _gammaB) * UINT8_MAX;
 
 		// Clamp values to valid range [0, UINT8_MAX]
-		quint8 clampedValueR = static_cast<quint8>(qBound(0.0, gammaCorrectedValueR, static_cast<double>(UINT8_MAX)));
-		quint8 clampedValueG = static_cast<quint8>(qBound(0.0, gammaCorrectedValueG, static_cast<double>(UINT8_MAX)));
-		quint8 clampedValueB = static_cast<quint8>(qBound(0.0, gammaCorrectedValueB, static_cast<double>(UINT8_MAX)));
+		auto clampedValueR = static_cast<quint8>(qBound(0.0, gammaCorrectedValueR, static_cast<double>(UINT8_MAX)));
+		auto clampedValueG = static_cast<quint8>(qBound(0.0, gammaCorrectedValueG, static_cast<double>(UINT8_MAX)));
+		auto clampedValueB = static_cast<quint8>(qBound(0.0, gammaCorrectedValueB, static_cast<double>(UINT8_MAX)));
 
 		// Assign clamped values to _mapping arrays
 		_mappingR[i] = clampedValueR;
@@ -78,13 +81,13 @@ void RgbTransform::initializeMapping()
 
 int RgbTransform::getBacklightThreshold() const
 {
-	return static_cast<int>(_backlightThreshold);
+	return _backlightThreshold;
 }
-
-void RgbTransform::setBacklightThreshold(double backlightThreshold)
+	
+void RgbTransform::setBacklightThreshold(int backlightThreshold)
 {
 	_backlightThreshold = backlightThreshold;
-	_sumBrightnessLow   = 765.0 * ((qPow(2.0,(_backlightThreshold/100)*2)-1) / 3.0);
+	_sumBrightnessLow = static_cast<uint8_t>(qBound(0, _backlightThreshold, static_cast<int>(UINT8_MAX)));
 }
 
 bool RgbTransform::getBacklightColored() const
@@ -153,10 +156,10 @@ void RgbTransform::getBrightnessComponents(uint8_t & rgb, uint8_t & cmy, uint8_t
 {
 	rgb = _brightness_rgb;
 	cmy = _brightness_cmy;
-	white   = _brightness_w;
+	white = _brightness_w;
 }
 
-void RgbTransform::applyGamma(uint8_t & red, uint8_t & green, uint8_t & blue)
+void RgbTransform::applyGamma(uint8_t & red, uint8_t & green, uint8_t & blue) const
 {
 	// apply gamma
 	red   = _mappingR[red];
@@ -166,31 +169,26 @@ void RgbTransform::applyGamma(uint8_t & red, uint8_t & green, uint8_t & blue)
 
 void RgbTransform::applyBacklight(uint8_t & red, uint8_t & green, uint8_t & blue) const
 {
-	// apply brightnesss
-	int rgbSum = red+green+blue;
-
-	if ( _backLightEnabled && _sumBrightnessLow > 0 && rgbSum < _sumBrightnessLow)
+	if (_backLightEnabled && _sumBrightnessLow > 0)
 	{
 		if (_backlightColored)
 		{
-			if (rgbSum == 0)
-			{
-				if (red  ==0) { red   = 1; }
-				if (green==0) { green = 1; }
-				if (blue ==0) { blue  = 1; }
-				rgbSum = red+green+blue;
-			}
-
-			uint8_t cLow = static_cast<uint8_t>(qMin(static_cast<double>(_sumBrightnessLow/rgbSum), static_cast<double>(UINT8_MAX)));
-			red   *= cLow;
-			green *= cLow;
-			blue  *= cLow;
+			red = qMax(red, _sumBrightnessLow);
+			green = qMax(green, _sumBrightnessLow);
+			blue = qMax(blue, _sumBrightnessLow);
 		}
 		else
 		{
-			red   = static_cast<uint8_t>(qMin(static_cast<double>(_sumBrightnessLow/3.0), static_cast<double>(UINT8_MAX)));
-			green = red;
-			blue  = red;
+			// Average of min and max channel values for backlight decision
+			int minVal = qMin<int>(red, qMin<int>(green, blue));
+			int maxVal = qMax<int>(red, qMax<int>(green, blue));
+			int avVal = (minVal + maxVal) / 2;
+			if (avVal < _sumBrightnessLow)
+			{
+				red = _sumBrightnessLow;
+				green = _sumBrightnessLow;
+				blue = _sumBrightnessLow;
+			}
 		}
 	}
 }