JFJochReaderImage: Add ROI description

reader/JFJochReaderImage.cpp

@@ -205,9 +205,11 @@ void JFJochReaderImage::CalcROI(const ROIElement *input) {
     std::unique_lock ul(roi_mutex);
 
     if (!input) {
+        roi_description = "";
         roi = {};
         return;
     }
+
     int64_t width = dataset->experiment.GetXPixelsNum();
     int64_t height = dataset->experiment.GetYPixelsNum();
 
@@ -228,6 +230,7 @@ void JFJochReaderImage::CalcROI(const ROIElement *input) {
             }
         }
     }
+    roi_description = input->toString();
 
     roi = ROIMessage{
             .sum = roi_val,
@@ -277,3 +280,7 @@ std::shared_ptr<JFJochReaderDataset> JFJochReaderImage::CreateMutableDataset() {
 int32_t JFJochReaderImage::GetAutoContrastValue() const {
    return auto_foreground;
 }
+
+std::string JFJochReaderImage::GetROIDescription() const {
+    return roi_description;
+}