UDP Signal color correction (#1902)

* added ui changes for saturation in sync

* added setters/getters for hsv settings

* added color correction logic

* faster algorithm for color conversion

* added save/load config to fs

* adjusted value scale

* move color functions to colors.cpp

* remove unchecked file

* Various small changes

Moved settings location in sync settings
Changed wording from hyperion to live
Moved code into setRealtimePixel(), reducing duplication and enabling the functionality for DMX streams

Co-authored-by: Christian Schwinne <dev.aircoookie@gmail.com>

wled00/cfg.cpp

@@ -271,6 +271,10 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
   CJSON(arlsDisableGammaCorrection, if_live[F("no-gc")]); // false
   CJSON(arlsOffset, if_live[F("offset")]); // 0
 
+  CJSON(liveHSVCorrection, if_live[F("corr")]);
+  CJSON(liveHSVSaturation, if_live[F("hsvsat")]);
+  CJSON(liveHSVValue, if_live[F("hsvval")]);
+
   CJSON(alexaEnabled, interfaces["va"][F("alexa")]); // false
 
   CJSON(macroAlexaOn, interfaces["va"]["macros"][0]);
@@ -608,10 +612,14 @@ void serializeConfig() {
   if_live_dmx[F("seqskip")] = e131SkipOutOfSequence;
   if_live_dmx[F("addr")] = DMXAddress;
   if_live_dmx[F("mode")] = DMXMode;
+
   if_live[F("timeout")] = realtimeTimeoutMs / 100;
   if_live[F("maxbri")] = arlsForceMaxBri;
   if_live[F("no-gc")] = arlsDisableGammaCorrection;
   if_live[F("offset")] = arlsOffset;
+  if_live[F("corr")] = liveHSVCorrection;
+  if_live[F("hsvsat")] = liveHSVSaturation;
+  if_live[F("hsvval")] = liveHSVValue;
 
   JsonObject if_va = interfaces.createNestedObject("va");
   if_va[F("alexa")] = alexaEnabled;

wled00/colors.cpp

@@ -47,6 +47,77 @@ void relativeChangeWhite(int8_t amount, byte lowerBoundary)
   col[3] = new_val;
 }
 
+void colorHSVtoRGB(float hue, float saturation, float value, byte& red, byte& green, byte& blue)
+{
+  float r, g, b;
+
+  auto i = static_cast<int>(hue * 6);
+  auto f = hue * 6 - i;
+  auto p = value * (1 - saturation);
+  auto q = value * (1 - f * saturation);
+  auto t = value * (1 - (1 - f) * saturation);
+
+  switch (i % 6)
+  {
+  case 0: r = value, g = t, b = p;
+    break;
+  case 1: r = q, g = value, b = p;
+    break;
+  case 2: r = p, g = value, b = t;
+    break;
+  case 3: r = p, g = q, b = value;
+    break;
+  case 4: r = t, g = p, b = value;
+    break;
+  case 5: r = value, g = p, b = q;
+    break;
+  }
+
+  red = static_cast<uint8_t>(r * 255);
+  green = static_cast<uint8_t>(g * 255);
+  blue = static_cast<uint8_t>(b * 255);
+}
+
+void colorRGBtoHSV(byte red, byte green, byte blue, float& hue, float& saturation, float& value)
+{
+  auto rd = static_cast<float>(red) / 255;
+  auto gd = static_cast<float>(green) / 255;
+  auto bd = static_cast<float>(blue) / 255;
+  auto max = std::max({ rd, gd, bd }), min = std::min({ rd, gd, bd });
+
+  value = max;
+
+  auto d = max - min;
+  saturation = max == 0 ? 0 : d / max;
+
+  hue = 0;
+  if (max != min)
+  {
+    if      (max == rd) hue = (gd - bd) / d + (gd < bd ? 6 : 0);
+    else if (max == gd) hue = (bd - rd) / d + 2;
+    else if (max == bd) hue = (rd - gd) / d + 4;
+    hue /= 6;
+  }
+}
+
+#define SATURATION_THRESHOLD 0.1
+#define MAX_HSV_VALUE 1
+#define MAX_HSV_SATURATION  1
+
+//corrects the realtime colors. 10 is the unchanged saturation/value
+//this feature might cause slowdowns with large LED counts
+void correctColors(byte r, byte g, byte b, byte* rgb) {
+  float hsv[3] = { 0,0,0 };
+  colorRGBtoHSV(r, g,b , hsv[0], hsv[1], hsv[2]);
+  float saturated = hsv[1] > SATURATION_THRESHOLD ?
+    hsv[1] * ((float)liveHSVSaturation / 10) : hsv[1];
+  float saturation = saturated < MAX_HSV_SATURATION ? saturated : MAX_HSV_SATURATION;
+
+  float valued = hsv[2] * ((float)liveHSVValue/10);
+  float value = valued < MAX_HSV_VALUE ? valued : MAX_HSV_VALUE;
+  colorHSVtoRGB(hsv[0], saturation, value, rgb[0], rgb[1], rgb[2]);
+}
+
 void colorHStoRGB(uint16_t hue, byte sat, byte* rgb) //hue, sat to rgb
 {
   float h = ((float)hue)/65535.0;

wled00/data/settings_sync.htm

@@ -28,7 +28,7 @@ Send notifications twice: <input type="checkbox" name="S2"><br>
 <i>Reboot required to apply changes. </i>
 <h3>Instance List</h3>
 Enable instance list: <input type="checkbox" name="NL"><br>
-Make this instance discoverable: <input type="checkbox" name="NB"><br>
+Make this instance discoverable: <input type="checkbox" name="NB">
 <h3>Realtime</h3>
 Receive UDP realtime: <input type="checkbox" name="RD"><br><br>
 <i>Network DMX input</i><br>
@@ -59,7 +59,10 @@ DMX mode:
 Timeout: <input name="ET" type="number" min="1" max="65000" required> ms<br>
 Force max brightness: <input type="checkbox" name="FB"><br>
 Disable realtime gamma correction: <input type="checkbox" name="RG"><br>
-Realtime LED offset: <input name="WO" type="number" min="-255" max="255" required>
+Realtime LED offset: <input name="WO" type="number" min="-255" max="255" required><br><br>
+Realtime HSV color correction: <input type="checkbox" name="HX"><br>
+Saturation (1-30): <input name="HS" type="number" min="1" max="30" value="1" step="1"><br>
+Value (1-60): <input name="HV" type="number" min="1" max="60" value="10" step="1">
 <h3>Alexa Voice Assistant</h3>
 Emulate Alexa device: <input type="checkbox" name="AL"><br>
 Alexa invocation name: <input name="AI" maxlength="32">

wled00/fcn_declare.h

@@ -58,6 +58,9 @@ void colorFromUint32(uint32_t in, bool secondary = false);
 void colorFromUint24(uint32_t in, bool secondary = false);
 uint32_t colorFromRgbw(byte* rgbw);
 void relativeChangeWhite(int8_t amount, byte lowerBoundary = 0);
+void colorHSVtoRGB(float hue, float saturation, float value, byte& red, byte& green, byte& blue);
+void colorRGBtoHSV(byte red, byte green, byte blue, float& hue, float& saturation, float& value);
+void correctColors(byte r, byte g, byte b, byte* rgb);
 void colorHStoRGB(uint16_t hue, byte sat, byte* rgb); //hue, sat to rgb
 void colorKtoRGB(uint16_t kelvin, byte* rgb);
 void colorCTtoRGB(uint16_t mired, byte* rgb); //white spectrum to rgb

wled00/html_settings.h

@@ -254,8 +254,8 @@ Send Macro notifications: <input type="checkbox" name="SM"><br>
 Send notifications twice: <input type="checkbox" name="S2"><br><i>
 Reboot required to apply changes.</i><h3>Instance List</h3>
 Enable instance list: <input type="checkbox" name="NL"><br>
-Make this instance discoverable: <input type="checkbox" name="NB"><br><h3>
+Make this instance discoverable: <input type="checkbox" name="NB"><h3>Realtime
-Realtime</h3>Receive UDP realtime: <input type="checkbox" name="RD"><br><br><i>
+</h3>Receive UDP realtime: <input type="checkbox" name="RD"><br><br><i>
 Network DMX input</i><br>Type: <select name="DI" onchange="SP(),adj()"><option 
 value="5568">E1.31 (sACN)</option><option value="6454">Art-Net</option><option 
 value="4048">DDP</option><option value="0" selected="selected">Custom port
@@ -275,9 +275,12 @@ E1.31 info</a><br>Timeout: <input name="ET" type="number" min="1" max="65000"
 required> ms<br>Force max brightness: <input type="checkbox" name="FB"><br>
 Disable realtime gamma correction: <input type="checkbox" name="RG"><br>
 Realtime LED offset: <input name="WO" type="number" min="-255" max="255" 
-required><h3>Alexa Voice Assistant</h3>Emulate Alexa device: <input 
+required><br><br>Realtime HSV color correction: <input type="checkbox" 
-type="checkbox" name="AL"><br>Alexa invocation name: <input name="AI" 
+name="HX"><br>Saturation (1-30): <input name="HS" type="number" min="1" 
-maxlength="32"><h3>Blynk</h3><b>
+max="30" value="1" step="1"><br>Value (1-60): <input name="HV" type="number" 
+min="1" max="60" value="10" step="1"><h3>Alexa Voice Assistant</h3>
+Emulate Alexa device: <input type="checkbox" name="AL"><br>
+Alexa invocation name: <input name="AI" maxlength="32"><h3>Blynk</h3><b>
 Blynk, MQTT and Hue sync all connect to external hosts!<br>
 This may impact the responsiveness of the ESP8266.</b><br>
 For best results, only use one of these services at a time.<br>

wled00/set.cpp

@@ -214,6 +214,10 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
     notifyMacro = request->hasArg(F("SM"));
     notifyTwice = request->hasArg(F("S2"));
 
+    liveHSVCorrection = request->hasArg(F("HX"));
+    liveHSVSaturation = request->arg(F("HS")).toInt();
+    liveHSVValue = request->arg(F("HV")).toInt();
+
     nodeListEnabled = request->hasArg(F("NL"));
     if (!nodeListEnabled) Nodes.clear();
     nodeBroadcastEnabled = request->hasArg(F("NB"));

wled00/udp.cpp

@@ -161,7 +161,6 @@ void handleNotifications()
       for (uint16_t i = 0; i < packetSize -2; i += 3)
       {
         setRealtimePixel(id, lbuf[i], lbuf[i+1], lbuf[i+2], 0);
-        
         id++; if (id >= ledCount) break;
       }
       strip.show();
@@ -424,6 +423,11 @@ void setRealtimePixel(uint16_t i, byte r, byte g, byte b, byte w)
   uint16_t pix = i + arlsOffset;
   if (pix < ledCount)
   {
+    if (liveHSVCorrection) {
+      byte correctedColors[3] = {0,0,0};
+      correctColors(r, g, b, correctedColors);
+      r = correctedColors[0]; g = correctedColors[1]; b = correctedColors[2];
+    }
     if (!arlsDisableGammaCorrection && strip.gammaCorrectCol)
     {
       strip.setPixelColor(pix, strip.gamma8(r), strip.gamma8(g), strip.gamma8(b), strip.gamma8(w));

wled00/wled.h

@@ -294,6 +294,9 @@ WLED_GLOBAL byte irEnabled      _INIT(0);     // Infrared receiver
 WLED_GLOBAL uint16_t udpPort    _INIT(21324); // WLED notifier default port
 WLED_GLOBAL uint16_t udpPort2   _INIT(65506); // WLED notifier supplemental port
 WLED_GLOBAL uint16_t udpRgbPort _INIT(19446); // Hyperion port
+WLED_GLOBAL bool liveHSVCorrection _INIT(false);
+WLED_GLOBAL uint16_t liveHSVSaturation _INIT(13);
+WLED_GLOBAL uint16_t liveHSVValue _INIT(10);
 
 WLED_GLOBAL bool receiveNotificationBrightness _INIT(true);       // apply brightness from incoming notifications
 WLED_GLOBAL bool receiveNotificationColor      _INIT(true);       // apply color

wled00/xml.cpp

@@ -396,6 +396,11 @@ void getSettingsJS(byte subPage, char* dest)
   {
     sappend('v',SET_F("UP"),udpPort);
     sappend('v',SET_F("U2"),udpPort2);
+
+    sappend('c',SET_F("HX"),liveHSVCorrection);
+    sappend('v',SET_F("HS"),liveHSVSaturation);
+    sappend('v',SET_F("HV"),liveHSVValue);
+
     sappend('c',SET_F("RB"),receiveNotificationBrightness);
     sappend('c',SET_F("RC"),receiveNotificationColor);
     sappend('c',SET_F("RX"),receiveNotificationEffects);