NAME

MPSImageLanczosScale

SYNOPSIS

#import <MPSImageResampling.h>

Inherits MPSImageScale.

Instance Methods

(nonnull instancetype) - initWithDevice:
(nullable instancetype) - initWithCoder:device:

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.