From f846750d48f98d0b96ae818ff1b271e672320c44 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 18 Dec 2024 14:27:21 +0530
Subject: [PATCH] Edit metadata dialog: Allow right clicking on the cover to
 view it in a popup window at larger size. Fixes #2091216 [[Enhancement] Open
 cover in Edit metadata with internal image
 viewer](https://bugs.launchpad.net/calibre/+bug/2091216)

---
 src/calibre/gui2/image_popup.py            | 16 +++++-----------
 src/calibre/gui2/metadata/basic_widgets.py | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/src/calibre/gui2/image_popup.py b/src/calibre/gui2/image_popup.py
index f6c3c3be9d..182e98a8fa 100644
--- a/src/calibre/gui2/image_popup.py
+++ b/src/calibre/gui2/image_popup.py
@@ -139,6 +139,7 @@ class ImageView(QDialog):
         self.avail_geom = self.screen().availableGeometry()
         self.current_img = current_img
         self.current_url = current_url
+        self.transformed = False
         self.factor = 1.0
         self.geom_name = geom_name
         self.zoom_in_action = ac = QAction(QIcon.ic('plus.png'), _('Zoom &in'), self)
@@ -327,18 +328,12 @@ class ImageView(QDialog):
         t = QTransform()
         t.rotate(90)
         pm = self.current_img = pm.transformed(t)
+        self.transformed = True
         self.label.setPixmap(pm)
-        self.label.adjustSize()
-        if self.fit_image.isChecked():
-            self.set_to_viewport_size()
-        else:
-            self.factor = 1
-            self.prefs.set('image_popup_zoom_factor', self.factor)
-            for sb in (self.scrollarea.horizontalScrollBar(),
-                    self.scrollarea.verticalScrollBar()):
-                sb.setValue(0)
+        self.adjust_image(self.factor)
 
     def __call__(self, use_exec=False):
+        self.transformed = False
         geom = self.avail_geom
         self.label.setPixmap(self.current_img)
         self.label.adjustSize()
@@ -350,8 +345,7 @@ class ImageView(QDialog):
             self.current_image_name = self.current_url
         reso = ''
         if self.current_img and not self.current_img.isNull():
-            if self.factor != 1:
-                self.adjust_image(self.factor)
+            self.adjust_image(self.factor)
             reso = f'[{self.current_img.width()}x{self.current_img.height()}]'
         title = _('Image: {name} {resolution}').format(name=self.current_image_name, resolution=reso)
         self.setWindowTitle(title)
diff --git a/src/calibre/gui2/metadata/basic_widgets.py b/src/calibre/gui2/metadata/basic_widgets.py
index b57a06f978..181e063f01 100644
--- a/src/calibre/gui2/metadata/basic_widgets.py
+++ b/src/calibre/gui2/metadata/basic_widgets.py
@@ -1228,6 +1228,20 @@ class Cover(ImageView):  # {{{
         self.setSizePolicy(QSizePolicy(QSizePolicy.Policy.Preferred,
             QSizePolicy.Policy.Preferred))
 
+    def build_context_menu(self):
+        m = super().build_context_menu()
+        m.addSeparator()
+        m.addAction(QIcon.ic('view-image'), _('View image in popup window'), self.view_image)
+        return m
+
+    def view_image(self):
+        from calibre.gui2.image_popup import ImageView
+        d = ImageView(self, self.pixmap(), 'cover.jpg')
+        d(use_exec=True)
+        if d.transformed:
+            from calibre.utils.img import image_to_data
+            self.current_val = image_to_data(d.current_img.toImage(), fmt='png')
+
     def undo_trim(self):
         if self.cdata_before_trim:
             self.current_val = self.cdata_before_trim