jfjoch_viewer: Add context menu to images to allow copy/clear ROI/fit to view

viewer/image_viewer/JFJochImage.cpp

@@ -8,6 +8,13 @@
 #include <QWheelEvent>
 #include <QMouseEvent>
 #include <QTimer>
+#include <QMenu>
+#include <QContextMenuEvent>
+#include <QClipboard>
+#include <QGuiApplication>
+#include <QMimeData>
+#include <QBuffer>
+#include <QPainter>
 
 JFJochImage::JFJochImage(QWidget *parent) : QGraphicsView(parent) {
     setDragMode(QGraphicsView::NoDrag); // Disable default drag mode
@@ -265,6 +272,81 @@ void JFJochImage::mouseReleaseEvent(QMouseEvent *event) {
 
 }
 
+void JFJochImage::contextMenuEvent(QContextMenuEvent *event) {
+    QMenu menu(this);
+
+    QAction *copyImageAct = menu.addAction(tr("Copy image"));
+    QAction *copyWithOverlayAct = menu.addAction(tr("Copy image with overlay"));
+    menu.addSeparator();
+    QAction *fitAct = menu.addAction(tr("Fit image to view"));
+    QAction *clearRoiAct = menu.addAction(tr("Clear ROI"));
+
+    const bool hasImage = (W > 0 && H > 0 && !pixmap.isNull());
+    copyImageAct->setEnabled(hasImage);
+    copyWithOverlayAct->setEnabled(hasImage && scene());
+
+    QAction *chosen = menu.exec(event->globalPos());
+    if (!chosen) return;
+
+    if (chosen == copyImageAct) {
+        copyImageToClipboard();
+    } else if (chosen == copyWithOverlayAct) {
+        copyImageWithOverlayToClipboard();
+    } else if (chosen == fitAct) {
+        fitToView();
+    } else if (chosen == clearRoiAct) {
+        clearROIInternal();
+    }
+}
+
+static void setClipboardAsJpegAndImage(const QImage &img, int quality = 95) {
+    // Provide both "image/jpeg" and generic image flavors for better compatibility
+    QByteArray ba;
+    ba.reserve(img.width() * img.height() * 3 / 2);
+    QBuffer buf(&ba);
+    buf.open(QIODevice::WriteOnly);
+    img.convertToFormat(QImage::Format_ARGB32); // ensure a known format for encoding
+    img.save(&buf, "JPEG", quality);
+
+    auto *mime = new QMimeData();
+    mime->setData("image/jpeg", ba);
+    mime->setImageData(img); // also set as generic bitmap
+    QGuiApplication::clipboard()->setMimeData(mime);
+}
+
+void JFJochImage::copyImageToClipboard() {
+    if (W == 0 || H == 0 || pixmap.isNull()) return;
+
+    // Use the underlying rendered image (no overlay)
+    QImage img = pixmap.toImage();
+    setClipboardAsJpegAndImage(img, 95);
+    emit writeStatusBar(tr("Image copied to clipboard"), 2000);
+}
+
+void JFJochImage::copyImageWithOverlayToClipboard() {
+    if (W == 0 || H == 0 || !scene()) return;
+
+    // Render the entire scene (image + overlay) at native image resolution
+    QImage img(int(W), int(H), QImage::Format_ARGB32_Premultiplied);
+    img.fill(Qt::transparent);
+    QPainter p(&img);
+    // Ensure we render the same logical rect as the scene/image coordinates
+    const QRectF sourceRect(0, 0, qreal(W), qreal(H));
+    scene()->render(&p, QRectF(0, 0, qreal(W), qreal(H)), sourceRect);
+    p.end();
+
+    setClipboardAsJpegAndImage(img, 95);
+    emit writeStatusBar(tr("Image with overlay copied to clipboard"), 2000);
+}
+
+void JFJochImage::clearROIInternal() {
+    roiBox = QRectF();     // clear any ROI
+    // Keep current roi_type; ROI simply becomes empty
+    CalcROI();             // will emit a zeroed ROI message
+    updateOverlay();
+    emit writeStatusBar(tr("ROI cleared"), 1500);
+}
+
 JFJochImage::ResizeHandle
 JFJochImage::hitTestROIHandle(const QPointF& scenePos, qreal tol) const {
         if (roiBox.isNull() || roiBox.width() <= 0 || roiBox.height() <= 0)

viewer/image_viewer/JFJochImage.h

@@ -19,6 +19,7 @@ class JFJochImage : public QGraphicsView {
     void writePixelLabels();
     void wheelEvent(QWheelEvent* event) override;
     void resizeEvent(QResizeEvent *event) override;
+    void contextMenuEvent(QContextMenuEvent *event) override;
 
     void mousePressEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
@@ -76,6 +77,10 @@ protected:
     // Perform initial fit-to-view (shorter direction), once per image size
     void fitToViewShorterSideOnce();
     QSize last_fit_viewport_ = {};
+
+    void copyImageToClipboard();
+    void copyImageWithOverlayToClipboard();
+    void clearROIInternal();
 signals:
     void foregroundChanged(float v);
     void backgroundChanged(float v);