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from fractions import Fraction
from typing import Callable, Tuple
from PIL import Image
from streamdeck_ui.display import filter
class EmptyFilter(filter.Filter):
"""
This is the empty (base) filter where all pipelines start from.
:param str name: The name of the filter. The name is useful for debugging purposes.
"""
def __init__(self):
super(EmptyFilter, self).__init__()
# For EmptyFilter - create a unique hashcode based on the name of the type
# This will create "some value" that uniquely identifies this filter output
# Since it never changes, this works.
# Calculate it once for speed
self.hashcode = hash(self.__class__)
def initialize(self, size: Tuple[int, int]):
self.image = Image.new("RGB", size)
def transform(self, get_input: Callable[[], Image.Image], get_output: Callable[[int], Image.Image], input_changed: bool, time: Fraction) -> Tuple[Image.Image, int]:
"""
Returns an empty Image object.
:param Fraction time: The current time in seconds, expressed as a fractional number since
the start of the pipeline.
"""
if not input_changed:
return (None, self.hashcode)
return ((self.image), self.hashcode)
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