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objective-ccalayer

Blur CIImage as a CALayer Content image

I am using bellow code for image blur. 'resultImage' shows the blurred image, but when I put it on a CALayer content It shows nothing.

CIImage *imageToBlur = [CIImage imageWithCGImage:image.CGImage];
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:imageToBlur forKey: @"inputImage"];
[gaussianBlurFilter setValue:[NSNumber numberWithFloat: 10] forKey: @"inputRadius"];
CIImage *resultImage = [gaussianBlurFilter valueForKey: @"outputImage"];
self.contents = resultImage;
Solution

  • You cantn't use CIImage as a content of CALayer . There might be some VRM issue. I dont no more about it. By the way you may use CGImageRef instead of CIImage. Based on your code the thing you can do ...

    CIImage *imageToBlur = [CIImage imageWithCGImage:image.CGImage];
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:imageToBlur forKey: @"inputImage"];
[gaussianBlurFilter setValue:[NSNumber numberWithFloat: 10] forKey: @"inputRadius"];
CIImage *resultImage = [gaussianBlurFilter valueForKey: @"outputImage"];
CIContext *cont = [CIContext contextWithOptions:nil];
CGImageRef img = [cont createCGImage:resultImage fromRect:CGRectMake(0, 0, image.size.width, image.size.height)];
self.contents = (__bridge id)img;

    I hope it'll work!