E-book viewer: Add the ability to rotate images to the popup image viewer. Fixes #1073513 ([enhancement] possibilty to rotate picture)

src/calibre/gui2/viewer/documentview.py

@@ -485,7 +485,7 @@ def initialize_view(self, debug_javascript=False):
         self.dictionary_action.triggered.connect(self.lookup)
         self.addAction(self.dictionary_action)
         self.image_popup = ImagePopup(self)
-        self.view_image_action = QAction(_('View &image...'), self)
+        self.view_image_action = QAction(QIcon(I('view-image.png')), _('View &image...'), self)
         self.view_image_action.triggered.connect(self.image_popup)
         self.search_action = QAction(QIcon(I('dictionary.png')),
                 _('&Search for next occurrence'), self)

src/calibre/gui2/viewer/image_popup.py

@@ -8,7 +8,8 @@
 __docformat__ = 'restructuredtext en'
 
 from PyQt4.Qt import (QDialog, QPixmap, QUrl, QScrollArea, QLabel, QSizePolicy,
-        QDialogButtonBox, QVBoxLayout, QPalette, QApplication, QSize, QIcon, Qt)
+        QDialogButtonBox, QVBoxLayout, QPalette, QApplication, QSize, QIcon,
+        Qt, QTransform)
 
 from calibre.gui2 import choose_save_file, gprefs
 
@@ -37,12 +38,15 @@ def __init__(self, parent, current_img, current_url):
         self.zi_button = zi = bb.addButton(_('Zoom &in'), bb.ActionRole)
         self.zo_button = zo = bb.addButton(_('Zoom &out'), bb.ActionRole)
         self.save_button = so = bb.addButton(_('&Save as'), bb.ActionRole)
+        self.rotate_button = ro = bb.addButton(_('&Rotate'), bb.ActionRole)
         zi.setIcon(QIcon(I('plus.png')))
         zo.setIcon(QIcon(I('minus.png')))
         so.setIcon(QIcon(I('save.png')))
+        ro.setIcon(QIcon(I('rotate-right.png')))
         zi.clicked.connect(self.zoom_in)
         zo.clicked.connect(self.zoom_out)
         so.clicked.connect(self.save_image)
+        ro.clicked.connect(self.rotate_image)
 
         self.l = l = QVBoxLayout()
         self.setLayout(l)
@@ -76,6 +80,14 @@ def adjust_scrollbars(self, factor):
                 self.scrollarea.verticalScrollBar()):
             sb.setValue(int(factor*sb.value()) + ((factor - 1) * sb.pageStep()/2))
 
+    def rotate_image(self):
+        pm = self.label.pixmap()
+        t = QTransform()
+        t.rotate(90)
+        pm = pm.transformed(t)
+        self.label.setPixmap(pm)
+        self.label.adjustSize()
+
     def __call__(self):
         geom = self.avail_geom
         self.label.setPixmap(self.current_img)