Changes for allowing Alexa to change light color to White when auto-calculating from RGB (#3211)

* Changes for allowing Alexa to change light color to White when auto-calculating from RGB

* Update alexa.cpp

Indention

* Do not rely on global auto white override

(gets white mode from segment light capabilities)

* alexa.cpp: Removed unnecessary whitespaces

---------

Co-authored-by: Aircoookie <21045690+Aircoookie@users.noreply.github.com>

wled00/FX.h

@@ -772,6 +772,7 @@ class WS2812FX {  // 96 bytes
       getActiveSegmentsNum(void),
       getFirstSelectedSegId(void),
       getLastActiveSegmentId(void),
+      getActiveSegsLightCapabilities(bool selectedOnly = false),
       setPixelSegment(uint8_t n);
 
     inline uint8_t getBrightness(void) { return _brightness; }

wled00/FX_fcn.cpp

@@ -1330,6 +1330,14 @@ void WS2812FX::setBrightness(uint8_t b, bool direct) {
   }
 }
 
+uint8_t WS2812FX::getActiveSegsLightCapabilities(bool selectedOnly) {
+  uint8_t totalLC = 0;
+  for (segment &seg : _segments) {
+    if (seg.isActive() && (!selectedOnly || seg.isSelected())) totalLC |= seg.getLightCapabilities();
+  }
+  return totalLC;
+}
+
 uint8_t WS2812FX::getFirstSelectedSegId(void)
 {
   size_t i = 0;

wled00/alexa.cpp

@@ -101,20 +101,27 @@ void onAlexaChange(EspalexaDevice* dev)
     {
       byte rgbw[4];
       uint16_t ct = dev->getCt();
-			if (!ct) return;
-			uint16_t k = 1000000 / ct; //mireds to kelvin
-			
-			if (strip.hasCCTBus()) {
-				strip.setCCT(k);
-				rgbw[0]= 0; rgbw[1]= 0; rgbw[2]= 0; rgbw[3]= 255;
-			} else if (strip.hasWhiteChannel()) {
+      if (!ct) return;
+      uint16_t k = 1000000 / ct; //mireds to kelvin
+
+      if (strip.hasCCTBus()) {
+        bool hasManualWhite = strip.getActiveSegsLightCapabilities(true) & SEG_CAPABILITY_W;
+
+        strip.setCCT(k);
+        if (hasManualWhite) {
+          rgbw[0] = 0; rgbw[1] = 0; rgbw[2] = 0; rgbw[3] = 255;
+        } else {
+          rgbw[0] = 255; rgbw[1] = 255; rgbw[2] = 255; rgbw[3] = 0;
+          dev->setValue(255);
+        }
+      } else if (strip.hasWhiteChannel()) {
         switch (ct) { //these values empirically look good on RGBW
           case 199: rgbw[0]=255; rgbw[1]=255; rgbw[2]=255; rgbw[3]=255; break;
           case 234: rgbw[0]=127; rgbw[1]=127; rgbw[2]=127; rgbw[3]=255; break;
           case 284: rgbw[0]=  0; rgbw[1]=  0; rgbw[2]=  0; rgbw[3]=255; break;
           case 350: rgbw[0]=130; rgbw[1]= 90; rgbw[2]=  0; rgbw[3]=255; break;
           case 383: rgbw[0]=255; rgbw[1]=153; rgbw[2]=  0; rgbw[3]=255; break;
-					default : colorKtoRGB(k, rgbw);
+          default : colorKtoRGB(k, rgbw);
         }
       } else {
         colorKtoRGB(k, rgbw);