Initial commit of support for the Philips Hue system.

Former-commit-id: 5b7d802c326151ee96a5b950badb01e94adfe7f3

libsrc/leddevice/LedDevicePhilipsHue.cpp

@@ -0,0 +1,81 @@
+// Local-Hyperion includes
+#include "LedDevicePhilipsHue.h"
+
+#include <iostream>
+
+#include <QtCore/qmath.h>
+#include <QUrl>
+#include <QHttpRequestHeader>
+#include <QThread>
+
+LedDevicePhilipsHue::LedDevicePhilipsHue(const std::string& output) :
+	host(output.c_str()), username("newdeveloper") {
+	http = new QHttp(host, 80);
+}
+
+LedDevicePhilipsHue::~LedDevicePhilipsHue() {
+	delete http;
+}
+
+int LedDevicePhilipsHue::write(const std::vector<ColorRgb> & ledValues) {
+	// Due to rate limiting (max. 30 request per seconds), discard new values if
+	// the previous request have not been completed yet.
+	if (http->hasPendingRequests()) {
+		return -1;
+	}
+	unsigned int lightId = 1;
+	for (const ColorRgb& color : ledValues) {
+		float x, y, b;
+		// Scale colors from [0, 255] to [0, 1] and convert to xy space.
+		rgbToXYBrightness(color.red / 255.0f, color.green / 255.0f, color.blue / 255.0f, x, y, b);
+		// Send adjust color command in JSON format.
+		put(getRoute(lightId), QString("{\"xy\": [%1, %2]}").arg(x).arg(y));
+		// Send brightness color command in JSON format.
+		put(getRoute(lightId), QString("{\"bri\": %1}").arg(qRound(b * 255.0f)));
+		// Next light id.
+		lightId++;
+	}
+	return 0;
+}
+
+int LedDevicePhilipsHue::switchOff() {
+	return 0;
+}
+
+void LedDevicePhilipsHue::put(QString route, QString content) {
+	QString url = QString("/api/%1/%2").arg(username).arg(route);
+	QHttpRequestHeader header("PUT", url);
+	header.setValue("Host", host);
+	header.setValue("Accept-Encoding", "identity");
+	header.setValue("Content-Length", QString("%1").arg(content.size()));
+	http->setHost(host);
+	http->request(header, content.toAscii());
+	// std::cout << "LedDevicePhilipsHue::put(): " << header.toString().toUtf8().constData() << std::endl;
+	// std::cout << "LedDevicePhilipsHue::put(): " << content.toUtf8().constData() << std::endl;
+}
+
+QString LedDevicePhilipsHue::getRoute(unsigned int lightId) {
+	return QString("lights/%1/state").arg(lightId);
+}
+
+void LedDevicePhilipsHue::rgbToXYBrightness(float red, float green, float blue, float& x, float& y, float& brightness) {
+	// Apply gamma correction.
+	red = (red > 0.04045f) ? qPow((red + 0.055f) / (1.0f + 0.055f), 2.4f) : (red / 12.92f);
+	green = (green > 0.04045f) ? qPow ((green + 0.055f) / (1.0f + 0.055f), 2.4f) : (green / 12.92f);
+	blue = (blue > 0.04045f) ? qPow ((blue + 0.055f) / (1.0f + 0.055f), 2.4f) : (blue / 12.92f);
+	// Convert to XYZ space.
+	float X = red * 0.649926f + green * 0.103455f + blue * 0.197109f;
+	float Y = red * 0.234327f + green * 0.743075f + blue * 0.022598f;
+	float Z = red * 0.0000000f + green * 0.053077f + blue * 1.035763f;
+	// Convert to x,y space.
+	x = X / (X + Y + Z);
+	y = Y / (X + Y + Z);
+	if (isnan(x)) {
+        x = 0.0f;
+    }
+    if (isnan(y)) {
+        y = 0.0f;
+    }
+    // Brightness is simply Y in the XYZ space.
+	brightness = Y;
+}