split platform

lib/python3.5/site-packages/PIL/features.py

@@ -0,0 +1,67 @@
+from PIL import Image
+
+modules = {
+    "pil": "PIL._imaging",
+    "tkinter": "PIL._imagingtk",
+    "freetype2": "PIL._imagingft",
+    "littlecms2": "PIL._imagingcms",
+    "webp": "PIL._webp",
+    "transp_webp": ("WEBP", "WebPDecoderBuggyAlpha")
+}
+
+
+def check_module(feature):
+    if feature not in modules:
+        raise ValueError("Unknown module %s" % feature)
+
+    module = modules[feature]
+
+    method_to_call = None
+    if type(module) is tuple:
+        module, method_to_call = module
+
+    try:
+        imported_module = __import__(module)
+    except ImportError:
+        # If a method is being checked, None means that
+        # rather than the method failing, the module required for the method
+        # failed to be imported first
+        return None if method_to_call else False
+
+    if method_to_call:
+        method = getattr(imported_module, method_to_call)
+        return method() is True
+    else:
+        return True
+
+
+def get_supported_modules():
+    supported_modules = []
+    for feature in modules:
+        if check_module(feature):
+            supported_modules.append(feature)
+    return supported_modules
+
+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():
+    supported_codecs = []
+    for feature in codecs:
+        if check_codec(feature):
+            supported_codecs.append(feature)
+    return supported_codecs