[ALICE3] TF3: fix labels filling in digitization (#15537)

* added mc label

* remove accum + fix labels filling

---------

Co-authored-by: GiorgioAlbertoLucia <giogioalberto@gmail.com>

Author: maciacco

Detectors/Upgrades/ALICE3/IOTOF/simulation/include/IOTOFSimulation/Chip.h

@@ -76,7 +76,7 @@ class Chip
   /// reset points container
   o2::iotof::LabeledDigit* findDigit(ULong64_t key);
 
-  void addDigit(UShort_t row, UShort_t col, Int_t charge, double time);
+  void addDigit(UShort_t row, UShort_t col, Int_t charge, double time, o2::MCCompLabel label);
 
  protected:
   Int_t mChipIndex = -1;                                ///< Chip ID

Detectors/Upgrades/ALICE3/IOTOF/simulation/src/Chip.cxx

@@ -32,8 +32,8 @@ Chip::Chip(Int_t index)
 {
 }
 //_______________________________________________________________________
-void Chip::addDigit(UShort_t row, UShort_t col, Int_t charge, double time)
+void Chip::addDigit(UShort_t row, UShort_t col, Int_t charge, double time, o2::MCCompLabel label)
 {
   ULong64_t key = Digit::getOrderingKey(mChipIndex, row, col);
-  mDigits.emplace(std::make_pair(key, LabeledDigit(mChipIndex, row, col, charge, time)));
+  mDigits.emplace(std::make_pair(key, LabeledDigit(mChipIndex, row, col, charge, time, label)));
 }

Detectors/Upgrades/ALICE3/IOTOF/simulation/src/Digitizer.cxx

@@ -242,7 +242,7 @@ void Digitizer::registerDigits(Chip& chip, uint32_t roFrame, float timeInitROF,
   o2::iotof::LabeledDigit* existingDigit = chip.findDigit(key);
   if (!existingDigit) {
     // No existing digit, create a new one
-    chip.addDigit(row, col, nElectrons, timeInitROF); // Last one should really just be time
+    chip.addDigit(row, col, nElectrons, timeInitROF, label); // Last one should really just be time
   } else {
     // Digit already exists, update charge and labels
     const int storedCharge = existingDigit->getCharge();

Steer/DigitizerWorkflow/src/IOTOFDigitizerSpec.cxx

@@ -139,10 +139,9 @@ class IOTOFDPLDigitizerTask : o2::base::BaseDPLDigitizer
     pc.outputs().snapshot(Output{mOrigin, "DIGITSROF", 0}, mROFRecords);
     if (mWithMCTruth) {
       auto& sharedlabels = pc.outputs().make<o2::dataformats::ConstMCTruthContainer<o2::MCCompLabel>>(Output{mOrigin, "DIGITSMCTR", 0});
-      mLabelsAccum.flatten_to(sharedlabels);
+      mLabels.flatten_to(sharedlabels);
       // free space of existing label containers
       mLabels.clear_andfreememory();
-      mLabelsAccum.clear_andfreememory();
 
       // write dummy MC2ROF vector to keep writer/readers backward compatible
       // NOTE: Steer/DigitizerWorkflow/src/ITSMFTDigitizerSpec.cxx also uses dummy MC2ROF
@@ -172,7 +171,6 @@ class IOTOFDPLDigitizerTask : o2::base::BaseDPLDigitizer
   std::vector<o2::itsmft::Hit> mHits{};
   std::vector<o2::itsmft::Hit>* mHitsP{&mHits};
   o2::dataformats::MCTruthContainer<o2::MCCompLabel> mLabels{};
-  o2::dataformats::MCTruthContainer<o2::MCCompLabel> mLabelsAccum{};
   std::vector<TChain*> mSimChains{};
   o2::parameters::GRPObject::ROMode mROMode = o2::parameters::GRPObject::PRESENT; // readout mode
 };