Minor fixes:

- optimized setPixelSegment()
- moved extractModeName() to util.cpp
- optimized extractModeName()
- removed SR extensions from /json/effects endpoint (compatibility estabished)

wled00/FX.h

@@ -657,7 +657,6 @@ class WS2812FX {
       setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w = 0),
       show(void),
 			setTargetFps(uint8_t fps),
-      setPixelSegment(uint8_t n),
       deserializeMap(uint8_t n=0);
 
     bool
@@ -688,6 +687,7 @@ class WS2812FX {
       //getFirstSelectedSegment(void),
       getMainSegmentId(void),
 			getTargetFps(void),
+      setPixelSegment(uint8_t n),
       gamma8(uint8_t),
       gamma8_cal(uint8_t, float),
       sin_gap(uint16_t),

wled00/FX_fcn.cpp

@@ -135,7 +135,7 @@ void WS2812FX::service() {
       uint16_t delay = FRAMETIME;
 
       if (!SEGMENT.getOption(SEG_OPTION_FREEZE)) { //only run effect function if not frozen
-        _virtualSegmentLength = SEGMENT.virtualLength();
+        SEGLEN = SEGMENT.virtualLength();
         _bri_t = SEGMENT.opacity; _colors_t[0] = SEGMENT.colors[0]; _colors_t[1] = SEGMENT.colors[1]; _colors_t[2] = SEGMENT.colors[2];
         uint8_t _cct_t = SEGMENT.cct;
         if (!IS_SEGMENT_ON) _bri_t = 0;
@@ -156,7 +156,7 @@ void WS2812FX::service() {
       SEGENV.next_time = nowUp + delay;
     }
   }
-  _virtualSegmentLength = 0;
+  SEGLEN = 0;
   busses.setSegmentCCT(-1);
   if(doShow) {
     yield();
@@ -716,36 +716,16 @@ bool WS2812FX::checkSegmentAlignment() {
 }
 
 //After this function is called, setPixelColor() will use that segment (offsets, grouping, ... will apply)
-//Note: If called in an interrupt (e.g. JSON API), it must be reset with "setPixelColor(255)",
+//Note: If called in an interrupt (e.g. JSON API), original segment must be restored,
 //otherwise it can lead to a crash on ESP32 because _segment_index is modified while in use by the main thread
-#ifdef ARDUINO_ARCH_ESP32
-uint8_t _segment_index_prev = 0;
-uint16_t _virtualSegmentLength_prev = 0;
-bool _ps_set = false;
-#endif
-
-void WS2812FX::setPixelSegment(uint8_t n)
+uint8_t WS2812FX::setPixelSegment(uint8_t n)
 {
+  uint8_t prevSegId = _segment_index;
   if (n < MAX_NUM_SEGMENTS) {
-		#ifdef ARDUINO_ARCH_ESP32
-		if (!_ps_set) {
-			_segment_index_prev = _segment_index;
-			_virtualSegmentLength_prev = _virtualSegmentLength;
-			_ps_set = true;
-		}
-		#endif
     _segment_index = n;
-    _virtualSegmentLength = SEGMENT.virtualLength();
-  } else {
-		_virtualSegmentLength = 0;
-		#ifdef ARDUINO_ARCH_ESP32
-		if (_ps_set) {
-			_segment_index = _segment_index_prev;
-			_virtualSegmentLength = _virtualSegmentLength_prev;
-			_ps_set = false;
-		}
-		#endif
+    SEGLEN = SEGMENT.virtualLength();
   }
+  return prevSegId;
 }
 
 void WS2812FX::setRange(uint16_t i, uint16_t i2, uint32_t col)

wled00/fcn_declare.h

@@ -138,7 +138,6 @@ void serializeState(JsonObject root, bool forPreset = false, bool includeBri = t
 void serializeInfo(JsonObject root);
 void serializeModeNames(JsonArray arr, const char *qstring);
 void serializeModeData(JsonObject root);
-uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen);
 void serveJson(AsyncWebServerRequest* request);
 bool serveLiveLeds(AsyncWebServerRequest* request, uint32_t wsClient = 0);
 
@@ -283,6 +282,7 @@ void _setRandomColor(bool _sec,bool fromButton=false);
 bool isAsterisksOnly(const char* str, byte maxLen);
 bool requestJSONBufferLock(uint8_t module=255);
 void releaseJSONBufferLock();
+uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen);
 
 //wled_eeprom.cpp
 void applyMacro(byte index);

wled00/json.cpp

@@ -174,7 +174,7 @@ void deserializeSegment(JsonObject elem, byte it, byte presetId)
 
   JsonArray iarr = elem[F("i")]; //set individual LEDs
   if (!iarr.isNull()) {
-    strip.setPixelSegment(id);
+    uint8_t oldSegId = strip.setPixelSegment(id);
 
     //freeze and init to black
     if (!seg.getOption(SEG_OPTION_FREEZE)) {
@@ -220,7 +220,7 @@ void deserializeSegment(JsonObject elem, byte it, byte presetId)
         set = 0;
       }
     }
-    strip.setPixelSegment(255);
+    strip.setPixelSegment(oldSegId);
     strip.trigger();
   } else if (!elem["frz"] && iarr.isNull()) { //return to regular effect
     seg.setOption(SEG_OPTION_FREEZE, false);
@@ -874,41 +874,6 @@ void serializeModeNames(JsonArray arr, const char *qstring) {
   }
 }
 
-// extracts effect mode (or palette) name from names serialized string
-// caller must provide large enough buffer!
-uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen)
-{
-  uint8_t qComma = 0;
-  bool insideQuotes = false;
-  uint8_t printedChars = 0;
-  char singleJsonSymbol;
-  size_t len = strlen_P(src);
-
-  // Find the mode name in JSON
-  for (size_t i = 0; i < len; i++) {
-    singleJsonSymbol = pgm_read_byte_near(src + i);
-    if (singleJsonSymbol == '\0') break;
-    switch (singleJsonSymbol) {
-      case '"':
-        insideQuotes = !insideQuotes;
-        break;
-      case '[':
-      case ']':
-        break;
-      case ',':
-        if (!insideQuotes) qComma++;
-      default:
-        if (!insideQuotes || (qComma != mode)) break;
-        dest[printedChars++] = singleJsonSymbol;
-    }
-    if ((qComma > mode) || (printedChars >= maxLen)) break;
-  }
-  dest[printedChars] = '\0';
-  char *pos = strchr(dest,'@');
-  if (pos) *pos = '\0';
-  return strlen(dest);
-}
-
 void serveJson(AsyncWebServerRequest* request)
 {
   byte subJson = 0;
@@ -925,14 +890,16 @@ void serveJson(AsyncWebServerRequest* request)
   }
   else if (url.indexOf(F("eff")) > 0) {
     // this is going to serve raw effect names which will include WLED-SR extensions in names
-    request->send_P(200, "application/json", JSON_mode_names);
-    // if we want parsed effect names use this (warning, this will prevent UI from receiving this extension making it useless)
-    //AsyncJsonResponse* response = new AsyncJsonResponse(JSON_BUFFER_SIZE, true);  // array document
-    //JsonArray doc = response->getRoot();
-    //deserializeModeNames(doc, JSON_mode_names); // remove WLED-SR extensions from effect names
-    //response->setLength();
-    //request->send(response);
-    //delete response;
+    if (requestJSONBufferLock(19)) {
+      AsyncJsonResponse* response = new AsyncJsonResponse(&doc, true);  // array document
+      JsonArray lDoc = response->getRoot();
+      serializeModeNames(lDoc, JSON_mode_names); // remove WLED-SR extensions from effect names
+      response->setLength();
+      request->send(response);
+      releaseJSONBufferLock();
+    } else {
+      request->send_P(200, "application/json", JSON_mode_names);
+    }
     return;
   }
   else if (url.indexOf("pal") > 0) {

wled00/util.cpp

@@ -231,3 +231,41 @@ void releaseJSONBufferLock()
   fileDoc = nullptr;
   jsonBufferLock = 0;
 }
+
+
+// extracts effect mode (or palette) name from names serialized string
+// caller must provide large enough buffer!
+uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen)
+{
+  uint8_t qComma = 0;
+  bool insideQuotes = false;
+  uint8_t printedChars = 0;
+  char singleJsonSymbol;
+  size_t len = strlen_P(src);
+
+  // Find the mode name in JSON
+  for (size_t i = 0; i < len; i++) {
+    singleJsonSymbol = pgm_read_byte_near(src + i);
+    if (singleJsonSymbol == '\0') break;
+    if (singleJsonSymbol == '@' && insideQuotes && qComma == mode) break; //stop when SR extension encountered
+    switch (singleJsonSymbol) {
+      case '"':
+        insideQuotes = !insideQuotes;
+        break;
+      case '[':
+      case ']':
+        break;
+      case ',':
+        if (!insideQuotes) qComma++;
+      default:
+        if (!insideQuotes || (qComma != mode)) break;
+        dest[printedChars++] = singleJsonSymbol;
+        break;
+    }
+    if ((qComma > mode) || (printedChars >= maxLen)) break;
+  }
+  dest[printedChars] = '\0';
+  //char *pos = strchr(dest,'@');
+  //if (pos) *pos = '\0';
+  return strlen(dest);
+}

wled00/wled.h

@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2201281
+#define VERSION 2201311
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG