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)
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