jfjoch_viewer: Read image scale factor

reader/JFJochHDF5Reader.cpp

@@ -307,6 +307,8 @@ void JFJochHDF5Reader::ReadFile(const std::string& filename) {
                 dataset->experiment.IndexingAlgorithm(IndexingAlgorithmEnum::FFT);
             else if (indexing == "ffbidx")
                 dataset->experiment.IndexingAlgorithm(IndexingAlgorithmEnum::FFBIDX);
+
+            dataset->scale_factor = master_file->ReadOptVector<float>("/entry/MX/imageScaleFactor");
         }
 
         auto ring_current_A = master_file->GetOptFloat("/entry/source/current");

reader/JFJochReaderDataset.h

@@ -41,6 +41,8 @@ struct JFJochReaderDataset {
     std::vector<float> mosaicity_deg;
     std::vector<float> b_factor;
 
+    std::vector<float> scale_factor;
+
     std::vector<int64_t> max_value;
 
     std::vector<std::string> roi;

viewer/JFJochViewerDatasetInfo.cpp

@@ -90,6 +90,10 @@ void JFJochViewerDatasetInfo::UpdateLabels() {
             combo_box->addItem("Mosaicity", 9);
         }
 
+        if (!dataset->scale_factor.empty()) {
+            combo_box->insertSeparator(1000);
+            combo_box->addItem("Scale factor", 10);
+        }
         for (int i = 0; i < this->dataset->roi.size(); i++) {
             std::string name = std::string("ROI ") + this->dataset->roi[i];
             combo_box->insertSeparator(1000);
@@ -167,6 +171,8 @@ void JFJochViewerDatasetInfo::UpdatePlot() {
             data = dataset->b_factor;
         } else if (val == 9) {
             data = dataset->mosaicity_deg;
+        } else if (val == 10) {
+            data = dataset->scale_factor;
         } else if (val >= 100) {
             int roi_index = (val - 100) / 4;