jfjoch_viewer: Better display (to be tested) of pixel refine

viewer/image_viewer/JFJochSimpleImage.cpp

@@ -40,6 +40,31 @@ void JFJochSimpleImage::setImage(std::shared_ptr<const SimpleImage> img) {
     }
 }
 
+void JFJochSimpleImage::setShoeboxes(QVector<QRect> boxes) {
+    shoeboxes_ = std::move(boxes);
+    // Redraw overlays on the current image (no-op if no image yet).
+    updateOverlay();
+}
+
+void JFJochSimpleImage::addCustomOverlay() {
+    if (shoeboxes_.isEmpty() || !scene())
+        return;
+
+    // Cosmetic 1-px outline so the box edges stay thin at any zoom; only draw the
+    // ones currently in view (there can be hundreds of reflections).
+    const QRectF visibleRect = mapToScene(viewport()->geometry()).boundingRect();
+    QPen pen(QColor(0, 220, 255), 0); // cyan, distinct from the prediction colours
+    pen.setCosmetic(true);
+
+    for (const QRect &b : shoeboxes_) {
+        const QRectF r(b.x(), b.y(), b.width(), b.height());
+        if (!visibleRect.intersects(r))
+            continue;
+        auto *item = scene()->addRect(r, pen);
+        addOverlayItem(item);
+    }
+}
+
 void JFJochSimpleImage::mouseHover(QMouseEvent *event) {
     if (image_) {
         const QPointF scenePos = mapToScene(event->pos());