def render_tiles(self, renderContext, tiles, sdx=1.0, sdy=1.0):
# create an compose_image that has the same resolution as the tiles
image = tiles.compose_image()
QgsImageOperation.adjustBrightnessContrast(image, self.brightness, self.contrast)
QgsImageOperation.adjustHueSaturation(image, self.saturation)
# tile extent to pixel
map2pixel = renderContext.mapToPixel()
extent = tiles.extent()
topLeft = map2pixel.transform(extent.xMinimum(), extent.yMaximum())
bottomRight = map2pixel.transform(extent.xMaximum(), extent.yMinimum())
rect = QRectF(QPointF(topLeft.x() * sdx, topLeft.y() * sdy),
QPointF(bottomRight.x() * sdx, bottomRight.y() * sdy))
# draw the compose_image on the map canvas
renderContext.painter().drawImage(rect, image)
self.log("TilesCollection extent: " + str(extent))
self.log("Draw into canvas rect: " + str(rect))
