Prevent error if attempt to keep going off the end of a presentation.

Reduce memory usage by not resizing small thumbnails back up to full monitor size in the slidecontroller.

bzr-revno: 1643

openlp/core/ui/slidecontroller.py

@@ -625,9 +625,7 @@ class SlideController(QtGui.QWidget):
                 label.setMargin(4)
                 label.setScaledContents(True)
                 if self.serviceItem.is_command():
-                    image = resize_image(frame[u'image'],
-                        self.parent().renderer.width,
-                        self.parent().renderer.height)
+                    image = QtGui.QImage(frame[u'image'])
                 else:
                     # If current slide set background to image
                     if framenumber == slideno:

openlp/plugins/presentations/lib/messagelistener.py

@@ -95,6 +95,8 @@ class Controller(object):
         if self.is_live:
             self.doc.start_presentation()
             if self.doc.slidenumber > 1:
+                if self.doc.slidenumber > self.doc.get_slide_count():
+                    self.doc.slidenumber = self.doc.get_slide_count()
                 self.doc.goto_slide(self.doc.slidenumber)
 
     def slide(self, slide):
@@ -150,6 +152,11 @@ class Controller(object):
             if self.doc.slidenumber < self.doc.get_slide_count():
                 self.doc.slidenumber = self.doc.slidenumber + 1
             return
+        # The "End of slideshow" screen is after the last slide
+        # Note, we can't just stop on the last slide, since it may
+        # contain animations that need to be stepped through.
+        if self.doc.slidenumber > self.doc.get_slide_count():
+            return
         self.activate()
         self.doc.next_step()
         self.doc.poll_slidenumber(self.is_live)