Renderer - speed up adding to slide controller

openlp/core/lib/rendermanager.py

@@ -205,7 +205,7 @@ class RenderManager(object):
         self.renderer.set_frame_dest(self.width, self.height)
         return self.renderer.generate_frame_from_lines(main_text, footer_text)
 
-    def resize_image(self, image):
+    def resize_image(self, image, width = 0,  height = 0):
         """
         Resize an image to fit on the current screen.
 
@@ -213,8 +213,12 @@ class RenderManager(object):
             The image to resize.
         """
         preview = QtGui.QImage(image)
-        w = self.width
-        h = self.height
+        if width == 0:
+            w = self.width
+            h = self.height
+        else:
+            w = width
+            h = height
         preview = preview.scaled(w, h, QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation)
         realw = preview.width();
         realh = preview.height()

openlp/core/ui/slidecontroller.py

@@ -21,7 +21,7 @@ import logging
 import os
 
 from PyQt4 import QtCore, QtGui
-from openlp.core.lib import OpenLPToolbar, translate, buildIcon, Receiver, ServiceType
+from openlp.core.lib import OpenLPToolbar, translate, buildIcon, Receiver, ServiceType, RenderManager
 
 class SlideList(QtGui.QTableWidget):
     """
@@ -250,20 +250,21 @@ class SlideController(QtGui.QWidget):
         """
         log.debug(u'displayServiceManagerItems Start')
         self.serviceitem = serviceitem
-        slide_pixmap = QtGui.QPixmap.fromImage(self.serviceitem.frames[0][u'image'])
+        slide_image = self.serviceitem.frames[0][u'image']
+        size = slide_image.size()
         slide_width = 300
-        slide_height = slide_width * slide_pixmap.height() / slide_pixmap.width()
+        slide_height = slide_width * size.height() / size.width()
         self.PreviewListWidget.clear()
         self.PreviewListWidget.setRowCount(0)
         self.PreviewListWidget.setColumnWidth(0, slide_width)
         for framenumber, frame in enumerate(self.serviceitem.frames):
             self.PreviewListWidget.setRowCount(self.PreviewListWidget.rowCount() + 1)
-            pixmap = QtGui.QPixmap.fromImage(frame[u'image'])
+            pixmap = self.parent.RenderManager.resize_image(frame[u'image'], slide_width, slide_height)
             item = QtGui.QTableWidgetItem()
             label = QtGui.QLabel()
             label.setMargin(8)
             label.setScaledContents(True)
-            label.setPixmap(pixmap)
+            label.setPixmap(QtGui.QPixmap.fromImage(pixmap))
             self.PreviewListWidget.setCellWidget(framenumber, 0, label)
             self.PreviewListWidget.setItem(framenumber, 0, item)
             self.PreviewListWidget.setRowHeight(framenumber, slide_height)