MXAnalysisAfterFPGA, ImageBuffer: remove unused members and functions

- MXAnalysisAfterFPGA: the ReadFromCPU mutex (each frame thread owns its
  analyzer), an uncalled global stddev(), an unused constant and include.
- ImageBuffer: slots_idle was counted but never read.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HVeDQsU5a8AJUdJPgWevAK

common/ImageBuffer.cpp

@@ -69,7 +69,6 @@ void ImageBuffer::StartMeasurement(size_t in_location_size) {
     slots_sending = 0;
     slots_preparation = 0;
     slots_in_preview = 0;
-    slots_idle = 0;
 
     // Clear queue and vectors
     while (!free_slots.empty())
@@ -116,8 +115,6 @@ ZeroCopyReturnValue *ImageBuffer::GetImageSlot(int64_t keep_free) {
         auto i = free_slots.front();
         free_slots.pop();
 
-        if (v[i].status == ImageBufferEntryStatus::Idle)
-            --slots_idle;
         v[i].status = ImageBufferEntryStatus::InPreparation;
         v[i].image_number = INT64_MIN;
         v[i].image_size = 0;
@@ -181,7 +178,6 @@ void ImageBuffer::ReleaseSlot(uint32_t location) {
     if (v[location].status != ImageBufferEntryStatus::Sending)
         return;
 
-    ++slots_idle;
     --slots_sending;
     v[location].status = ImageBufferEntryStatus::Idle;
     free_slots.push(location);

common/ImageBuffer.h

@@ -47,7 +47,6 @@ class ImageBuffer {
     int64_t slots_preparation = 0;
     int64_t slots_sending = 0;
     int64_t slots_in_preview = 0;
-    int64_t slots_idle = 0;
 
     bool disable_requests = true; // All requests fail in this state
     int64_t counter = 0; // Counter is increased when something changes in the image buffer

image_analysis/MXAnalysisAfterFPGA.cpp

@@ -6,28 +6,9 @@
 #include <span>
 
 #include "spot_finding/DetModuleSpotFinder_cpu.h"
-#include "../common/CUDAWrapper.h"
 #include "../common/JFJochException.h"
 #include "spot_finding/SpotUtils.h"
 
-double stddev(const std::vector<float> &v) {
-    if (v.size() <= 1)
-        return 0.0;
-
-    double mean = 0.0f;
-
-    for (const auto &i: v)
-        mean += i;
-    mean /= v.size();
-
-    double stddev = 0.0f;
-    for (const auto &i: v)
-        stddev += (i - mean) * (i - mean);
-
-    return sqrt(stddev / (v.size() - 1));
-}
-
-
 MXAnalysisAfterFPGA::MXAnalysisAfterFPGA(const DiffractionExperiment &in_experiment,
                                          const AzimuthalIntegrationMapping &in_integration,
                                          IndexAndRefine &indexer)
@@ -84,8 +65,6 @@ void MXAnalysisAfterFPGA::ReadFromFPGA(const DeviceOutput *output, const SpotFin
 }
 
 void MXAnalysisAfterFPGA::ReadFromCPU(DeviceOutput *output, const SpotFindingSettings &settings, size_t module_number) {
-    std::unique_lock ul(read_from_cpu_mutex);
-
     if (state == State::Disabled || !find_spots || !settings.enable) {
         state = State::Disabled;
     } else {

image_analysis/MXAnalysisAfterFPGA.h

@@ -10,7 +10,6 @@
 #include "IndexAndRefine.h"
 
 class MXAnalysisAfterFPGA {
-    mutable std::mutex read_from_cpu_mutex;
     const DiffractionExperiment &experiment;
     const AzimuthalIntegrationMapping &integration;
     IndexAndRefine &indexer;
@@ -18,7 +17,6 @@ class MXAnalysisAfterFPGA {
 
     bool find_spots = false;
     std::vector<DiffractionSpot> spots;
-    constexpr static const float spot_distance_threshold_pxl = 2.0f;
 
     std::vector<float> arr_mean;
     std::vector<float> arr_sttdev;