Package apple.metalperformanceshaders

Class MPSImageGaussianBlur

  • All Implemented Interfaces:
    NSCoding, NSCopying, NSSecureCoding, NSObject
    public class MPSImageGaussianBlur
extends MPSUnaryImageKernel
    MPSImageGaussianBlur The MPSImageGaussianBlur convolves an image with gaussian of given sigma in both x and y direction. The MPSImageGaussianBlur utilizes a very fast algorith that typically runs at approximately 1/2 of copy speeds. Notably, it is faster than either the tent or box blur except perhaps for very large filter windows. Mathematically, it is an approximate gaussian. Some non-gaussian behavior may be detectable with advanced analytical methods such as FFT. If a analytically clean gaussian filter is required, please use the MPSImageConvolution filter instead with an appropriate set of weights. The MPSImageGaussianBlur is intended to be suitable for all common image processing needs demanding ~10 bits of precision or less.

    • Constructor Detail

      • MPSImageGaussianBlur

        protected MPSImageGaussianBlur​(org.moe.natj.general.Pointer peer)

    • Method Detail

      • accessInstanceVariablesDirectly

        public static boolean accessInstanceVariablesDirectly()

      • allocWithZone

        public static java.lang.Object allocWithZone​(org.moe.natj.general.ptr.VoidPtr zone)

      • automaticallyNotifiesObserversForKey

        public static boolean automaticallyNotifiesObserversForKey​(java.lang.String key)

      • cancelPreviousPerformRequestsWithTarget

        public static void cancelPreviousPerformRequestsWithTarget​(java.lang.Object aTarget)

      • cancelPreviousPerformRequestsWithTargetSelectorObject

        public static void cancelPreviousPerformRequestsWithTargetSelectorObject​(java.lang.Object aTarget,
                                                                         org.moe.natj.objc.SEL aSelector,
                                                                         java.lang.Object anArgument)

      • classFallbacksForKeyedArchiver

        public static NSArray<java.lang.String> classFallbacksForKeyedArchiver()

      • classForKeyedUnarchiver

        public static org.moe.natj.objc.Class classForKeyedUnarchiver()

      • debugDescription_static

        public static java.lang.String debugDescription_static()

      • description_static

        public static java.lang.String description_static()

      • hash_static

        public static long hash_static()

      • instanceMethodSignatureForSelector

        public static NSMethodSignature instanceMethodSignatureForSelector​(org.moe.natj.objc.SEL aSelector)

      • instancesRespondToSelector

        public static boolean instancesRespondToSelector​(org.moe.natj.objc.SEL aSelector)

      • isSubclassOfClass

        public static boolean isSubclassOfClass​(org.moe.natj.objc.Class aClass)

      • keyPathsForValuesAffectingValueForKey

        public static NSSet<java.lang.String> keyPathsForValuesAffectingValueForKey​(java.lang.String key)

      • new_objc

        public static java.lang.Object new_objc()

      • resolveClassMethod

        public static boolean resolveClassMethod​(org.moe.natj.objc.SEL sel)

      • resolveInstanceMethod

        public static boolean resolveInstanceMethod​(org.moe.natj.objc.SEL sel)

      • setVersion_static

        public static void setVersion_static​(long aVersion)

      • superclass_static

        public static org.moe.natj.objc.Class superclass_static()

      • version_static

        public static long version_static()

      • initWithDevice

        public MPSImageGaussianBlur initWithDevice​(java.lang.Object device)
        Description copied from class: MPSUnaryImageKernel
        Standard init with default properties per filter type
        Overrides:
        initWithDevice in class MPSUnaryImageKernel
        Parameters:
        device - The device that the filter will be used on. May not be NULL.
        Returns:
        a pointer to the newly initialized object. This will fail, returning nil if the device is not supported. Devices must be MTLFeatureSet_iOS_GPUFamily2_v1 or later.

      • initWithDeviceSigma

        public MPSImageGaussianBlur initWithDeviceSigma​(MTLDevice device,
                                                float sigma)
        Initialize a gaussian blur filter for a particular sigma and device
        Parameters:
        device - The device the filter will run on
        sigma - The standard deviation of gaussian blur filter. Gaussian weight, centered at 0, at integer grid i is given as w(i) = 1/sqrt(2*pi*sigma) * exp(-i^2/2*sigma^2) If we take cut off at 1% of w(0) (max weight) beyond which weights are considered 0, we have ceil (sqrt(-log(0.01)*2)*sigma) ~ ceil(3.7*sigma) as rough estimate of filter width
        Returns:
        A valid object or nil, if failure.

      • sigma

        public float sigma()
        [@property] sigma Read-only sigma value with which filter was created

      • initWithCoderDevice

        public MPSImageGaussianBlur initWithCoderDevice​(NSCoder aDecoder,
                                                java.lang.Object device)
        NSSecureCoding compatability While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know which device your data is allocated on, we have to guess and may guess incorrectly. To avoid that problem, use initWithCoder:device instead.
        Overrides:
        initWithCoderDevice in class MPSUnaryImageKernel
        Parameters:
        aDecoder - The NSCoder subclass with your serialized MPSKernel
        device - The MTLDevice on which to make the MPSKernel
        Returns:
        A new MPSKernel object, or nil if failure.

      • supportsSecureCoding

        public static boolean supportsSecureCoding()

      • _supportsSecureCoding

        public boolean _supportsSecureCoding()
        Description copied from interface: NSSecureCoding
        This property must return YES on all classes that allow secure coding. Subclasses of classes that adopt NSSecureCoding and override initWithCoder: must also override this method and return YES. The Secure Coding Guide should be consulted when writing methods that decode data.
        Specified by:
        _supportsSecureCoding in interface NSSecureCoding
        Overrides:
        _supportsSecureCoding in class MPSUnaryImageKernel