macOS

1.

    NSString *sourceImagePath = [[NSBundle mainBundle] pathForResource:@"20" ofType:@"jpg"];

    CIImage *sourceImg = [CIImage imageWithData:[NSData dataWithContentsOfFile:sourceImagePath]];
    CGFloat pictureWidth = sourceImg.extent.size.width;
    CGFloat pictureHeight = sourceImg.extent.size.height;

    CGAffineTransform xform = CGAffineTransformIdentity;
    NSValue *xformObj = [NSValue valueWithBytes:&xform objCType:@encode(CGAffineTransform)];
    CIImage *affineImage = [sourceImg imageByApplyingFilter:@"CIAffineTile" withInputParameters:@{kCIInputTransformKey : xformObj}];
    CIImage *resut = [affineImage imageByCroppingToRect:CGRectMake(0,0, 2*pictureWidth, 2*pictureHeight)];
 

2. 

    NSString *sourceImagePath = [[NSBundle mainBundle] pathForResource:@"20" ofType:@"jpg"];

    CIImage *sourceImg = [CIImage imageWithData:[NSData dataWithContentsOfFile:sourceImagePath]];
    CGFloat pictureWidth = sourceImg.extent.size.width;
    CGFloat pictureHeight = sourceImg.extent.size.height;

    CIFilter *filterTile = [CIFilter filterWithName:@"CIAffineTile"];
    [filterTile setDefaults];
    [filterTile setValue:sourceImg forKey:kCIInputImageKey];

    CGAffineTransform translate = CGAffineTransformMakeTranslation(pictureWidth, pictureHeight);
    [filterTile setValue:[NSValue valueWithBytes:&translate
                                        objCType:@encode(CGAffineTransform)]
                  forKey:@"inputTransform"];


    CIImage *affineImage = [filterTile outputImage];

    CIVector *cropRect =[CIVector vectorWithX:0
                                            Y:0
                                            Z:2 * pictureWidth
                                            W:2 * pictureHeight];



    CIFilter *crop = [CIFilter filterWithName:@"CICrop"];
    [crop setValue:[filterTile outputImage] forKey:@"inputImage"];
    [crop setValue:cropRect forKey:@"inputRectangle"];
    CIImage *resut = [crop outputImage];