Hello friends,
The enclosed procedure is producing a NSImage from another NSImage, by
cropping in a NSRect.
The resulting sub-Image feeds an imageView in the APP Interface and the may
change frequently, then being hopefully disposed by ARC
The last line of the procedure :
NSImage *subImage = [[NSImage alloc] initWithCGImage:subImageRef
size:NSZeroSize];
Generates a leak problem.
it is quite unclear if i should release or not the subImageRef.
If I release, the app crashes soon after.
If I don’t release, Instrument/Leaks reports a leak of subImageRef after each
call.
Obviously, ARC never releases subImageRef which, as far as I understand,
is owned by the subImage after the call.
Digging the web , apple doc, and various AI, did not provide a solution to this
dilemme.
I would greatly appreciate some help on this
Happy summer..
JP
C
//=============================================================================
+ (NSImage *)getSubImageFromImage:(NSImage *)image atRect:(NSRect)rect
//=============================================================================
{
// Convert the NSImage to a CGImageRef
CGImageRef imageRef= nil, subImageRef= nil;
imageRef = [image CGImageForProposedRect:NULL context:nil hints:nil];
if (imageRef == nil ) { return nil; } // Failed to create CGImageRef
// Get the subimage from the CGImageRef
subImageRef = CGImageCreateWithImageInRect(imageRef, rect);
CFRelease(imageRef);
if(subImageRef == nil ) { return nil; } // Failed to create subImageRef
// Convert the subimage CGImageRef to an NSImage
NSImage *subImage = [[NSImage alloc] initWithCGImage:subImageRef
size:NSZeroSize];
// CFRelease(subImageRef); // it is quite unclear if i should release the
subImageRef
//If I release, the app crashes soon after.
// If i dont release Instrument/Leaks report a leak at next call.
// The subImage goes to a NSbutton in the interface, and will also soon be
replaced by another one, producing a leak of subImageRef
return subImage;
}// getSubImageFromImage
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