Capturing webpage thumbnails using Python PyQt WebKit

Premium users in IRC-Galleria are allowed to customize their profile pages using CSS based modifications (mods). The picture above shows the tool that the users use to select from existing mods. Thumbnails for the mods are being generated using a small Python script that utilizes PyQt WebKit library and is controlled with Thrift.

Here's a simplified pseudocode example of the process used to capture the web pages containing mods.

# The QWebPage used to render the pages needs a QApplication environment, so create it app = QApplication([])   # app.exec_() blocks so use QTimer to shoot the actual main QTimer().singleShot(0, main) app.exec_()   ...   def main():   # wait for thrift calls and sent them to snapshot()   ...   def snapshot(url, filename):   # Create page   page = QWebPage()     # Disable scrollbars from the captures   frame.setScrollBarPolicy(Qt.Horizontal, Qt.ScrollBarAlwaysOff)   frame.setScrollBarPolicy(Qt.Vertical, Qt.ScrollBarAlwaysOff)     loading = True   success = False     # loadFinished event listener for updating loading and success   def load_finished(result):     loading = False     success = result     # Bind loadFinished event   connect(page, SIGNAL("loadFinished(bool)", load_finished)     # Start loading   page.mainFrame().load(QUrl(url))     # Wait   while self.loading:     QCoreApplication.processEvents()     # Check result   if success == False:     return     # Resize the browser   size = page.viewportSize()   size.setWidth(1024)   size.setHeight(1024)   page.setViewportSize(size)     # Render the page to an QImage using QPainter   image = QImage(size, QImage.Format_RGB32)   painter = QPainter(image)   page.mainFrame().render(painter)   painter.end()     # Scale and save to file   image.scaled(200, 200, Qt.IgnoreAspectRatio, Qt.SmoothTransformation).save(filename, 'JPG', 95)