Current File : //usr/lib/python3/dist-packages/PIL/features.py
from __future__ import annotations
import collections
import os
import sys
import warnings
import PIL
from . import Image
modules = {
"pil": ("PIL._imaging", "PILLOW_VERSION"),
"tkinter": ("PIL._tkinter_finder", "tk_version"),
"freetype2": ("PIL._imagingft", "freetype2_version"),
"littlecms2": ("PIL._imagingcms", "littlecms_version"),
"webp": ("PIL._webp", "webpdecoder_version"),
}
def check_module(feature):
"""
Checks if a module is available.
:param feature: The module to check for.
:returns: ``True`` if available, ``False`` otherwise.
:raises ValueError: If the module is not defined in this version of Pillow.
"""
if feature not in modules:
msg = f"Unknown module {feature}"
raise ValueError(msg)
module, ver = modules[feature]
try:
__import__(module)
return True
except ModuleNotFoundError:
return False
except ImportError as ex:
warnings.warn(str(ex))
return False
def version_module(feature):
"""
:param feature: The module to check for.
:returns:
The loaded version number as a string, or ``None`` if unknown or not available.
:raises ValueError: If the module is not defined in this version of Pillow.
"""
if not check_module(feature):
return None
module, ver = modules[feature]
if ver is None:
return None
return getattr(__import__(module, fromlist=[ver]), ver)
def get_supported_modules():
"""
:returns: A list of all supported modules.
"""
return [f for f in modules if check_module(f)]
codecs = {
"jpg": ("jpeg", "jpeglib"),
"jpg_2000": ("jpeg2k", "jp2klib"),
"zlib": ("zip", "zlib"),
"libtiff": ("libtiff", "libtiff"),
}
def check_codec(feature):
"""
Checks if a codec is available.
:param feature: The codec to check for.
:returns: ``True`` if available, ``False`` otherwise.
:raises ValueError: If the codec is not defined in this version of Pillow.
"""
if feature not in codecs:
msg = f"Unknown codec {feature}"
raise ValueError(msg)
codec, lib = codecs[feature]
return codec + "_encoder" in dir(Image.core)
def version_codec(feature):
"""
:param feature: The codec to check for.
:returns:
The version number as a string, or ``None`` if not available.
Checked at compile time for ``jpg``, run-time otherwise.
:raises ValueError: If the codec is not defined in this version of Pillow.
"""
if not check_codec(feature):
return None
codec, lib = codecs[feature]
version = getattr(Image.core, lib + "_version")
if feature == "libtiff":
return version.split("\n")[0].split("Version ")[1]
return version
def get_supported_codecs():
"""
:returns: A list of all supported codecs.
"""
return [f for f in codecs if check_codec(f)]
features = {
"webp_anim": ("PIL._webp", "HAVE_WEBPANIM", None),
"webp_mux": ("PIL._webp", "HAVE_WEBPMUX", None),
"transp_webp": ("PIL._webp", "HAVE_TRANSPARENCY", None),
"raqm": ("PIL._imagingft", "HAVE_RAQM", "raqm_version"),
"fribidi": ("PIL._imagingft", "HAVE_FRIBIDI", "fribidi_version"),
"harfbuzz": ("PIL._imagingft", "HAVE_HARFBUZZ", "harfbuzz_version"),
"libjpeg_turbo": ("PIL._imaging", "HAVE_LIBJPEGTURBO", "libjpeg_turbo_version"),
"libimagequant": ("PIL._imaging", "HAVE_LIBIMAGEQUANT", "imagequant_version"),
"xcb": ("PIL._imaging", "HAVE_XCB", None),
}
def check_feature(feature):
"""
Checks if a feature is available.
:param feature: The feature to check for.
:returns: ``True`` if available, ``False`` if unavailable, ``None`` if unknown.
:raises ValueError: If the feature is not defined in this version of Pillow.
"""
if feature not in features:
msg = f"Unknown feature {feature}"
raise ValueError(msg)
module, flag, ver = features[feature]
try:
imported_module = __import__(module, fromlist=["PIL"])
return getattr(imported_module, flag)
except ModuleNotFoundError:
return None
except ImportError as ex:
warnings.warn(str(ex))
return None
def version_feature(feature):
"""
:param feature: The feature to check for.
:returns: The version number as a string, or ``None`` if not available.
:raises ValueError: If the feature is not defined in this version of Pillow.
"""
if not check_feature(feature):
return None
module, flag, ver = features[feature]
if ver is None:
return None
return getattr(__import__(module, fromlist=[ver]), ver)
def get_supported_features():
"""
:returns: A list of all supported features.
"""
return [f for f in features if check_feature(f)]
def check(feature):
"""
:param feature: A module, codec, or feature name.
:returns:
``True`` if the module, codec, or feature is available,
``False`` or ``None`` otherwise.
"""
if feature in modules:
return check_module(feature)
if feature in codecs:
return check_codec(feature)
if feature in features:
return check_feature(feature)
warnings.warn(f"Unknown feature '{feature}'.", stacklevel=2)
return False
def version(feature):
"""
:param feature:
The module, codec, or feature to check for.
:returns:
The version number as a string, or ``None`` if unknown or not available.
"""
if feature in modules:
return version_module(feature)
if feature in codecs:
return version_codec(feature)
if feature in features:
return version_feature(feature)
return None
def get_supported():
"""
:returns: A list of all supported modules, features, and codecs.
"""
ret = get_supported_modules()
ret.extend(get_supported_features())
ret.extend(get_supported_codecs())
return ret
def pilinfo(out=None, supported_formats=True):
"""
Prints information about this installation of Pillow.
This function can be called with ``python3 -m PIL``.
:param out:
The output stream to print to. Defaults to ``sys.stdout`` if ``None``.
:param supported_formats:
If ``True``, a list of all supported image file formats will be printed.
"""
if out is None:
out = sys.stdout
Image.init()
print("-" * 68, file=out)
print(f"Pillow {PIL.__version__}", file=out)
py_version = sys.version.splitlines()
print(f"Python {py_version[0].strip()}", file=out)
for py_version in py_version[1:]:
print(f" {py_version.strip()}", file=out)
print("-" * 68, file=out)
print(
f"Python modules loaded from {os.path.dirname(Image.__file__)}",
file=out,
)
print(
f"Binary modules loaded from {os.path.dirname(Image.core.__file__)}",
file=out,
)
print("-" * 68, file=out)
for name, feature in [
("pil", "PIL CORE"),
("tkinter", "TKINTER"),
("freetype2", "FREETYPE2"),
("littlecms2", "LITTLECMS2"),
("webp", "WEBP"),
("transp_webp", "WEBP Transparency"),
("webp_mux", "WEBPMUX"),
("webp_anim", "WEBP Animation"),
("jpg", "JPEG"),
("jpg_2000", "OPENJPEG (JPEG2000)"),
("zlib", "ZLIB (PNG/ZIP)"),
("libtiff", "LIBTIFF"),
("raqm", "RAQM (Bidirectional Text)"),
("libimagequant", "LIBIMAGEQUANT (Quantization method)"),
("xcb", "XCB (X protocol)"),
]:
if check(name):
if name == "jpg" and check_feature("libjpeg_turbo"):
v = "libjpeg-turbo " + version_feature("libjpeg_turbo")
else:
v = version(name)
if v is not None:
version_static = name in ("pil", "jpg")
if name == "littlecms2":
# this check is also in src/_imagingcms.c:setup_module()
version_static = tuple(int(x) for x in v.split(".")) < (2, 7)
t = "compiled for" if version_static else "loaded"
if name == "raqm":
for f in ("fribidi", "harfbuzz"):
v2 = version_feature(f)
if v2 is not None:
v += f", {f} {v2}"
print("---", feature, "support ok,", t, v, file=out)
else:
print("---", feature, "support ok", file=out)
else:
print("***", feature, "support not installed", file=out)
print("-" * 68, file=out)
if supported_formats:
extensions = collections.defaultdict(list)
for ext, i in Image.EXTENSION.items():
extensions[i].append(ext)
for i in sorted(Image.ID):
line = f"{i}"
if i in Image.MIME:
line = f"{line} {Image.MIME[i]}"
print(line, file=out)
if i in extensions:
print(
"Extensions: {}".format(", ".join(sorted(extensions[i]))), file=out
)
features = []
if i in Image.OPEN:
features.append("open")
if i in Image.SAVE:
features.append("save")
if i in Image.SAVE_ALL:
features.append("save_all")
if i in Image.DECODERS:
features.append("decode")
if i in Image.ENCODERS:
features.append("encode")
print("Features: {}".format(", ".join(features)), file=out)
print("-" * 68, file=out)
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