Question

I am using ios 5 with ARc enable. so in the following example I’m getting the memory leak warning…but since using ARC , i cant use autorelease. Please any suggestion anyone?

  -(void)coreImageEffect{
    CIImage *inputImage = [[CIImage alloc] initWithImage:blurImage.image];
    CIFilter *hueAdjust = [CIFilter filterWithName:@"CIHueAdjust"];

    [hueAdjust setDefaults];
    [hueAdjust setValue:inputImage forKey:@"inputImage"];
    [hueAdjust setValue:[NSNumber numberWithFloat: 3.4f]
    forKey:@"inputAngle"];

    CIImage *outputImage = [hueAdjust valueForKey:@"outputImage"];
    CIContext *context = [CIContext contextWithOptions:nil];

    blurImage.image = [UIImage imageWithCGImage:
    [context createCGImage:outputImage
    fromRect:outputImage.extent]];

    }

I cannot use [CIContext Autorelease];
the problem is showing CIContext “Method returns a core foundation object with a +1 retain count”

Please suggest.

Answer 1

-createCGImage:… returns a Core Graphics object which is not an Objective-C object and will not be managed by ARC. So you have to CGImageRelease it manually:

CGImageRef cgImage = [context createCGImage:outputImage
                                   fromRect:outputImage.extent];
blurImage.image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);

but why not use +imageWithCIImage: directly?

blurImage.image = [UIImage imageWithCIImage:outputImage];