Source code for PIL.features

import collections
import os
import sys
import warnings

import PIL

from . import Image

modules = {
    "pil": ("PIL._imaging", "PILLOW_VERSION"),
    "tkinter": ("PIL._tkinter_finder", None),
    "freetype2": ("PIL._imagingft", "freetype2_version"),
    "littlecms2": ("PIL._imagingcms", "littlecms_version"),
    "webp": ("PIL._webp", "webpdecoder_version"),
}


[docs]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 not (feature in modules): raise ValueError("Unknown module %s" % feature) module, ver = modules[feature] try: __import__(module) return True except ImportError: return False
[docs]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)
[docs]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"), }
[docs]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: raise ValueError("Unknown codec %s" % feature) codec, lib = codecs[feature] return codec + "_encoder" in dir(Image.core)
[docs]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
[docs]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"), "libjpeg_turbo": ("PIL._imaging", "HAVE_LIBJPEGTURBO", "libjpeg_turbo_version"), "libimagequant": ("PIL._imaging", "HAVE_LIBIMAGEQUANT", "imagequant_version"), "xcb": ("PIL._imaging", "HAVE_XCB", None), }
[docs]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: raise ValueError("Unknown feature %s" % feature) module, flag, ver = features[feature] try: imported_module = __import__(module, fromlist=["PIL"]) return getattr(imported_module, flag) except ImportError: return None
[docs]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)
[docs]def get_supported_features(): """ :returns: A list of all supported features. """ return [f for f in features if check_feature(f)]
[docs]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("Unknown feature '%s'." % feature, stacklevel=2) return False
[docs]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
[docs]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
[docs]def pilinfo(out=None, supported_formats=True): """ Prints information about this installation of Pillow. This function can be called with ``python -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("Pillow {}".format(PIL.__version__), file=out) py_version = sys.version.splitlines() print("Python {}".format(py_version[0].strip()), file=out) for py_version in py_version[1:]: print(" {}".format(py_version.strip()), file=out) print("-" * 68, file=out) print( "Python modules loaded from {}".format(os.path.dirname(Image.__file__)), file=out, ) print( "Binary modules loaded from {}".format(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: t = "compiled for" if name in ("pil", "jpg") else "loaded" 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 = "{}".format(i) if i in Image.MIME: line = "{} {}".format(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)