QGIS » QGIS Application

I've been using the following python code for rendering, however it causes text to get partially displayed at the image edges.

def render(self, tile):
        scale = self.scaleCalc.calculate(self.projector.transform(tile.toRectangle()), self.width)
        self.settings.setExtent(self.projector.transform(tile.toRectangle()))
        job = QgsMapRendererSequentialJob(self.settings)
        job.start()
        job.waitForFinished()
        image = job.renderedImage()

I've tried to make a call to QgsMapRendererJob.drawLabeling(), as below, in an attempt to stop this behaviour, but this causes a crash.

def render(self, tile):
        scale = self.scaleCalc.calculate(self.projector.transform(tile.toRectangle()), self.width)
        self.settings.setExtent(self.projector.transform(tile.toRectangle()))
        job = QgsMapRendererSequentialJob(self.settings)
    # added
        labeler = QgsPalLabeling()
        labeler.setShowingPartialsLabels(False)
        painter = QPainter()
        painter.setRenderHint(QPainter.Antialiasing)
        QgsMapRendererJob.drawLabeling(self.settings, QgsRenderContext(), labeler, painter)
    #  added - end

job.start()
        job.waitForFinished()
        image = job.renderedImage()

I'm new to QGIS and Python. I've not been able to find guidance on the calling convention to call the drawLabeling C++ function. Consequently, I don't know if the problem is an input error, a syntax error or a coding logic error.