Possible fix for #3541

wled00/FX.h

@@ -779,6 +779,7 @@ class WS2812FX {  // 96 bytes
     inline void appendSegment(const Segment &seg = Segment()) { if (_segments.size() < getMaxSegments()) _segments.push_back(seg); }
 
     bool
+      paletteFade,
       checkSegmentAlignment(void),
       hasRGBWBus(void),
       hasCCTBus(void),
@@ -791,7 +792,6 @@ class WS2812FX {  // 96 bytes
     inline bool isOffRefreshRequired(void) {return _isOffRefreshRequired;}
 
     uint8_t
-      paletteFade,
       paletteBlend,
       milliampsPerLed,
       cctBlending,

wled00/cfg.cpp

@@ -377,6 +377,7 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
   CJSON(modeBlending, light_tr["fx"]);
   int tdd = light_tr["dur"] | -1;
   if (tdd >= 0) transitionDelay = transitionDelayDefault = tdd * 100;
+  strip.setTransition(fadeTransition ? transitionDelayDefault : 0);
   CJSON(strip.paletteFade, light_tr["pal"]);
   CJSON(randomPaletteChangeTime, light_tr[F("rpc")]);
 

wled00/json.cpp

@@ -240,8 +240,9 @@ bool deserializeSegment(JsonObject elem, byte it, byte presetId)
     seg.map1D2D = M12_Pixels; // no mapping
 
     // set brightness immediately and disable transition
-    transitionDelayTemp = 0;
     jsonTransitionOnce = true;
+    seg.stopTransition();
+    strip.setTransition(0);
     strip.setBrightness(scaledBri(bri), true);
 
     // freeze and init to black
@@ -323,23 +324,18 @@ bool deserializeState(JsonObject root, byte callMode, byte presetId)
   int tr = -1;
   if (!presetId || currentPlaylist < 0) { //do not apply transition time from preset if playlist active, as it would override playlist transition times
     tr = root[F("transition")] | -1;
-    if (tr >= 0)
-    {
-      transitionDelay = tr;
-      transitionDelay *= 100;
-      transitionDelayTemp = transitionDelay;
+    if (tr >= 0) {
+      transitionDelay = tr * 100;
+      if (fadeTransition) strip.setTransition(transitionDelay);
     }
   }
 
   // temporary transition (applies only once)
   tr = root[F("tt")] | -1;
-  if (tr >= 0)
-  {
-    transitionDelayTemp = tr;
-    transitionDelayTemp *= 100;
+  if (tr >= 0) {
     jsonTransitionOnce = true;
+    if (fadeTransition) strip.setTransition(tr * 100);
   }
-  strip.setTransition(transitionDelayTemp); // required here for color transitions to have correct duration
 
   tr = root[F("tb")] | -1;
   if (tr >= 0) strip.timebase = ((uint32_t)tr) - millis();
@@ -375,8 +371,8 @@ bool deserializeState(JsonObject root, byte callMode, byte presetId)
 
   if (root.containsKey("live")) {
     if (root["live"].as<bool>()) {
-      transitionDelayTemp = 0;
       jsonTransitionOnce = true;
+      strip.setTransition(0);
       realtimeLock(65000);
     } else {
       exitRealtime();

wled00/led.cpp

@@ -134,11 +134,11 @@ void stateUpdated(byte callMode) {
   usermods.onStateChange(callMode);
 
   if (fadeTransition) {
-    //set correct delay if not using notification delay
-    if (callMode != CALL_MODE_NOTIFICATION && !jsonTransitionOnce) transitionDelayTemp = transitionDelay; // load actual transition duration
+    // restore (global) transition time if not called from UDP notifier or single/temporary transition from JSON (also playlist)
+    if (!(callMode == CALL_MODE_NOTIFICATION || jsonTransitionOnce)) strip.setTransition(transitionDelay);
     jsonTransitionOnce = false;
-    strip.setTransition(transitionDelayTemp);
-    if (transitionDelayTemp == 0) {
+    if (strip.getTransition() == 0) {
+      transitionActive = false;
       applyFinalBri();
       strip.trigger();
       return;
@@ -152,7 +152,6 @@ void stateUpdated(byte callMode) {
     transitionActive = true;
     transitionStartTime = millis();
   } else {
-    strip.setTransition(0);
     applyFinalBri();
     strip.trigger();
   }
@@ -187,12 +186,10 @@ void handleTransitions()
   if (doPublishMqtt) publishMqtt();
 #endif
 
-  if (transitionActive && transitionDelayTemp > 0)
-  {
-    float tper = (millis() - transitionStartTime)/(float)transitionDelayTemp;
-    if (tper >= 1.0f)
-    {
-      strip.setTransitionMode(false);
+  if (transitionActive && strip.getTransition() > 0) {
+    float tper = (millis() - transitionStartTime)/(float)strip.getTransition();
+    if (tper >= 1.0f) {
+      strip.setTransitionMode(false); // stop all transitions
       transitionActive = false;
       tperLast = 0;
       applyFinalBri();

wled00/playlist.cpp

@@ -144,7 +144,7 @@ void handlePlaylist() {
     }
 
     jsonTransitionOnce = true;
-    transitionDelayTemp = playlistEntries[playlistIndex].tr * 100;
+    strip.setTransition(fadeTransition ? playlistEntries[playlistIndex].tr * 100 : 0);
     playlistEntryDur = playlistEntries[playlistIndex].dur;
     applyPreset(playlistEntries[playlistIndex].preset);
   }

wled00/set.cpp

@@ -1089,6 +1089,7 @@ bool handleSet(AsyncWebServerRequest *request, const String& req, bool apply)
 
   pos = req.indexOf(F("TT="));
   if (pos > 0) transitionDelay = getNumVal(&req, pos);
+  if (fadeTransition) strip.setTransition(transitionDelay);
 
   //set time (unix timestamp)
   pos = req.indexOf(F("ST="));

wled00/udp.cpp

@@ -211,6 +211,11 @@ void parseNotifyPacket(uint8_t *udpIn) {
 
   bool someSel = (receiveNotificationBrightness || receiveNotificationColor || receiveNotificationEffects);
 
+  // set transition time before making any segment changes
+  if (version > 3) {
+    if (fadeTransition) strip.setTransition(((udpIn[17] << 0) & 0xFF) + ((udpIn[18] << 8) & 0xFF00));
+  }
+
   //apply colors from notification to main segment, only if not syncing full segments
   if ((receiveNotificationColor || !someSel) && (version < 11 || !receiveSegmentOptions)) {
     // primary color, only apply white if intented (version > 0)
@@ -365,10 +370,6 @@ void parseNotifyPacket(uint8_t *udpIn) {
     }
   }
 
-  if (version > 3) {
-    transitionDelayTemp = ((udpIn[17] << 0) & 0xFF) + ((udpIn[18] << 8) & 0xFF00);
-  }
-
   nightlightActive = udpIn[6];
   if (nightlightActive) nightlightDelayMins = udpIn[7];
 

wled00/wled.h

@@ -354,9 +354,6 @@ WLED_GLOBAL byte briS     _INIT(128);                     // default brightness
 WLED_GLOBAL byte nightlightTargetBri _INIT(0);      // brightness after nightlight is over
 WLED_GLOBAL byte nightlightDelayMins _INIT(60);
 WLED_GLOBAL byte nightlightMode      _INIT(NL_MODE_FADE); // See const.h for available modes. Was nightlightFade
-WLED_GLOBAL bool fadeTransition      _INIT(true);   // enable crossfading color transition
-WLED_GLOBAL bool modeBlending        _INIT(true);   // enable effect blending
-WLED_GLOBAL uint16_t transitionDelay _INIT(750);    // default crossfade duration in ms
 
 WLED_GLOBAL byte briMultiplier _INIT(100);          // % of brightness to set (to limit power, if you set it to 50 and set bri to 255, actual brightness will be 127)
 
@@ -534,13 +531,15 @@ WLED_GLOBAL bool wasConnected _INIT(false);
 WLED_GLOBAL byte lastRandomIndex _INIT(0);        // used to save last random color so the new one is not the same
 
 // transitions
+WLED_GLOBAL bool          fadeTransition          _INIT(true);    // enable crossfading brightness/color
+WLED_GLOBAL bool          modeBlending            _INIT(true);    // enable effect blending
 WLED_GLOBAL bool          transitionActive        _INIT(false);
-WLED_GLOBAL uint16_t      transitionDelayDefault  _INIT(transitionDelay); // default transition time (storec in cfg.json)
-WLED_GLOBAL uint16_t      transitionDelayTemp     _INIT(transitionDelay); // actual transition duration (overrides transitionDelay in certain cases)
+WLED_GLOBAL uint16_t      transitionDelay         _INIT(750);     // global transition duration
+WLED_GLOBAL uint16_t      transitionDelayDefault  _INIT(750);     // default transition time (stored in cfg.json)
 WLED_GLOBAL unsigned long transitionStartTime;
-WLED_GLOBAL float         tperLast                _INIT(0.0f);            // crossfade transition progress, 0.0f - 1.0f
-WLED_GLOBAL bool          jsonTransitionOnce      _INIT(false);           // flag to override transitionDelay (playlist, JSON API: "live" & "seg":{"i"} & "tt")
-WLED_GLOBAL uint8_t       randomPaletteChangeTime _INIT(5);               // amount of time [s] between random palette changes (min: 1s, max: 255s)
+WLED_GLOBAL float         tperLast                _INIT(0.0f);    // crossfade transition progress, 0.0f - 1.0f
+WLED_GLOBAL bool          jsonTransitionOnce      _INIT(false);   // flag to override transitionDelay (playlist, JSON API: "live" & "seg":{"i"} & "tt")
+WLED_GLOBAL uint8_t       randomPaletteChangeTime _INIT(5);       // amount of time [s] between random palette changes (min: 1s, max: 255s)
 
 // nightlight
 WLED_GLOBAL bool nightlightActive _INIT(false);