@class CIImage, CIVector, NSNumber; @interface CITwirlDistortion : CIFilter @property (retain, nonatomic) CIImage *inputImage; @property (retain, nonatomic) CIVector *inputCenter; @property (retain, nonatomic) NSNumber *inputRadius; @property (retain, nonatomic) NSNumber *inputAngle; + (id)customAttributes; - (id)_kernel; - (id)outputImage; @end