Creates an image source that reads from a location specified by a URL.
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CGImageSourceRef CGImageSourceCreateWithURL(CFURLRef url, CFDictionaryRef options);
The URL to read from.
A dictionary that specifies additional creation options. See Image Source Option Dictionary Keys for the keys you can supply.
An image source. You are responsible for releasing this object using CFRelease.
Creates an image source that reads data from the specified data provider.
Creates an image source that reads from a Core Foundation data object.