MPSImageLanczosScale(3)
NAME
MPSImageLanczosScale
SYNOPSIS
#import <MPSImageResampling.h> Inherits MPSImageScale. Instance Methods (nonnull instancetype) - initWithDevice: (nullable instancetype) - initWithCoder:device: Additional Inherited Members
Detailed Description
Resize an image and / or change its aspect ratio The MPSImageLanczosScale filter can be used to resample an existing image using a different sampling frequency in each dimension. This can be used to enlarge or reduce the size of an image, or change the aspect ratio of an image. The filter uses a Lanczos resampling algorithm which typically produces better quality for photographs, but is slower than linear sampling using the GPU texture units. Lanczos downsampling does not require a low pass filter to be applied before it is used. Because the resampling function has negative lobes, Lanczos can result in ringing near sharp edges, making it less suitable for vector art.
Method Documentation
- (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) 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. 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. Reimplemented from MPSImageScale. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device Standard init with default properties per filter type 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. Reimplemented from MPSImageScale.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-Thu2Jul 13 2017 MPSImageLanczosScale(3)
Mac OS X 10.13.1 - Generated Tue Nov 7 07:46:38 CST 2017