def __init__(self, width, height, loop=0, bg_color=None):
"""
Parameters
----------
:width & height: size of the image in pixels.
:loop: number of loops of the image.
:bg_color: background color index.
"""
self.width = width
self.height = height
self.loop = loop
self.palette = None
self._io = BytesIO()
if bg_color is not None:
self.write(encoder.rectangle(0, 0, width, height, bg_color))
def paint(self, *args):
"""Paint a rectangular region in the surface."""
self._gif_surface.write(encoder.rectangle(*args))