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Decoder num_threads as a module constant #76

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Oct 11, 2024
Merged

Decoder num_threads as a module constant #76

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3 changes: 2 additions & 1 deletion pillow_jxl/JpegXLImagePlugin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
from pillow_jxl import Decoder, Encoder

_VALID_JXL_MODES = {"RGB", "RGBA", "L", "LA"}
DECODE_THREADS = -1 # -1 detect available cpu cores, 0 disables parallelism


def _accept(data):
Expand All @@ -26,7 +27,7 @@ class JXLImageFile(ImageFile.ImageFile):

def _open(self):
self.fc = self.fp.read()
self._decoder = Decoder()
self._decoder = Decoder(num_threads=DECODE_THREADS)

self.jpeg, self._jxlinfo, self._data, icc_profile = self._decoder(self.fc)
# FIXME (Isotr0py): Maybe slow down jpeg reconstruction
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5 changes: 3 additions & 2 deletions pillow_jxl/__init__.pyi
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Expand Up @@ -15,7 +15,8 @@ class Encoder:
parallel: bool = True,
has_alpha: bool = False,
lossless: bool = True,
quality: float = 0.0): ...
quality: float = 0.0,
num_threads: int = -1): ...

def __call__(self, data: bytes, width: int, height: int, jpeg_encode: bool) -> bytes: ...
'''
Expand All @@ -37,7 +38,7 @@ class Decoder:
parallel(`bool`): enable parallel decoding
'''

def __init__(self, parallel: bool = True): ...
def __init__(self, num_threads: int = -1): ...

def __call__(self, data: bytes) -> (bool, ImageInfo, bytes): ...
'''
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