first commit

projecten1/lib/python3.6/site-packages/PIL/features.py

@@ -0,0 +1,85 @@
+from . import Image
+
+modules = {
+    "pil": "PIL._imaging",
+    "tkinter": "PIL._tkinter_finder",
+    "freetype2": "PIL._imagingft",
+    "littlecms2": "PIL._imagingcms",
+    "webp": "PIL._webp",
+}
+
+
+def check_module(feature):
+    if not (feature in modules):
+        raise ValueError("Unknown module %s" % feature)
+
+    module = modules[feature]
+
+    try:
+        __import__(module)
+        return True
+    except ImportError:
+        return False
+
+
+def get_supported_modules():
+    return [f for f in modules if check_module(f)]
+
+
+codecs = {
+    "jpg": "jpeg",
+    "jpg_2000": "jpeg2k",
+    "zlib": "zip",
+    "libtiff": "libtiff"
+}
+
+
+def check_codec(feature):
+    if feature not in codecs:
+        raise ValueError("Unknown codec %s" % feature)
+
+    codec = codecs[feature]
+
+    return codec + "_encoder" in dir(Image.core)
+
+
+def get_supported_codecs():
+    return [f for f in codecs if check_codec(f)]
+
+
+features = {
+    "webp_anim": ("PIL._webp", 'HAVE_WEBPANIM'),
+    "webp_mux": ("PIL._webp", 'HAVE_WEBPMUX'),
+    "transp_webp": ("PIL._webp", "HAVE_TRANSPARENCY"),
+    "raqm": ("PIL._imagingft", "HAVE_RAQM")
+}
+
+
+def check_feature(feature):
+    if feature not in features:
+        raise ValueError("Unknown feature %s" % feature)
+
+    module, flag = features[feature]
+
+    try:
+        imported_module = __import__(module, fromlist=['PIL'])
+        return getattr(imported_module, flag)
+    except ImportError:
+        return None
+
+
+def get_supported_features():
+    return [f for f in features if check_feature(f)]
+
+
+def check(feature):
+    return (feature in modules and check_module(feature) or
+            feature in codecs and check_codec(feature) or
+            feature in features and check_feature(feature))
+
+
+def get_supported():
+    ret = get_supported_modules()
+    ret.extend(get_supported_features())
+    ret.extend(get_supported_codecs())
+    return ret