Re: CIImage (TIFFRepresentation) memory leak

FROM : slasktrattenator
DATE : Mon Mar 10 21:03:19 2008

I narrowed this down by removing the filters, and the leak is still
there. And what a leak! Everytime I draw the view the memory usage
increases with the size of the drawn image. Yet this exact same code
is used in the Core Image Programming Guide. So I figure it's a bug in
Core Image. But how can I avoid it?


- (void) drawRect:(NSRect)rect
{
        CIImage *image = [CIImage imageWithData:[[self image]
TIFFRepresentation]];
      if (image !=nil) {

                CGRect cg;
                CIContext *context = [[NSGraphicsContext
currentContext] CIContext];
                cg = CGRectMake(NSMinX(rect), NSMinY(rect),
NSWidth(rect), NSHeight(rect));
                [context drawImage:image
                                        atPoint:cg.origin
                                        fromRect:cg];

        }
}

On Mon, Mar 10, 2008 at 5:33 PM,  <<email_removed>> wrote:
> Hi,
>
>  I'm applying a Core Image filter to an image in a NSImageView
>  subclass. The drawing works fine, except it leaks memory, not sure
>  why. This is my drawRect method. Anything wrong with it? Thanks.
>
>
>  - (void) drawRect:(NSRect)rect
>  {
>
>        [[self image] setFlipped:YES];
>        CIImage *image = [CIImage imageWithData:[[self image] TIFFRepresentation]];
>        if (image !=nil) {
>                CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
>                [filter setDefaults];
>                [filter setValue: image forKey: @"inputImage"];
>                [filter setValue: [NSNumber numberWithFloat:0.7] forKey: @"inputRadius"];
>                image = [filter valueForKey: @"outputImage"];
>
>                filter = [CIFilter filterWithName:@"CIPerspectiveTransform"];
>                [filter setDefaults];
>                [filter setValue: image forKey: @"inputImage"];
>                [filter setValue:[CIVector vectorWithX:NSMinX(rect) Y:NSMinY(rect) +
>  bLeft ] forKey:@"inputBottomLeft"];
>                [filter setValue:[CIVector vectorWithX:NSMaxX(rect) Y:NSMinY(rect) +
>  bRight ] forKey:@"inputBottomRight"];
>                [filter setValue:[CIVector vectorWithX:NSMinX(rect) Y:NSMaxY(rect) +
>  tLeft ] forKey:@"inputTopLeft"];
>                [filter setValue:[CIVector vectorWithX:NSMaxX(rect) Y:NSMaxY(rect) +
>  tRight ] forKey:@"inputTopRight"];
>                image = [filter valueForKey: @"outputImage"];
>
>                CGRect cg;
>                CIContext *context = [[NSGraphicsContext currentContext] CIContext];
>                cg = CGRectMake(NSMinX(rect), NSMinY(rect), NSWidth(rect), NSHeight(rect));
>                [context drawImage:image
>                                        atPoint:cg.origin
>                                        fromRect:cg];
>
>        }
>  }
>