def preparePixmap(self):
        painter = QPainter(self.outPixmap())
        painter.drawPixmap(QPoint(0, 0), self.startPixmap())
        return -1.0, 1.0
This function does the heavy lifting of building a zone. It coordinates
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/q_pixmap_transition.py/QFadeTransition.preparePixmap--crossover with--dataset/ETHPy150Open rtucker-mozilla/mozilla_inventory/mozdns/mozbind/zone_builder.py/build_zone_data