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Re: NSImage TIFFRepresentation memory leak

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Re: NSImage TIFFRepresentation memory leak

Subject: Re: NSImage TIFFRepresentation memory leak
From: Roland Torres <email@hidden>
Date: Wed, 29 Nov 2006 17:43:32 -0800

On Nov 29, 2006, at 12:39 PM, j o a r wrote:


On 29 nov 2006, at 21.25, Roland Torres wrote:

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    [anImage lockFocus];
    NSData *nsData = [anImage TIFFRepresentation]; // <-- Leak City
    [anImage unlockFocus];
    [nsData writeToFile::];  // <-- No leak here
    [pool release];

Why do you bracket the call to TIFFRepresentation inside calls to lockFocus/unlockFocus?


There, just as a test. I've removed them; no difference.

Any ideas?
Check the memory management history for your tiff-data using ObjectAlloc. That should tell you what's going on.

Here's the backtrace from ObjectAlloc stemming from the line in question. I'm not sure what it's saying, other than TIFFRepresentation keeps allocating more and more memory...?

GLEngine-2560

start _start main() NSApplicationMain -[NSApplication run] -[NSApplication sendEvent:] -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] _DPSNextEvent BlockUntilNextEventMatchingListInMode ReceiveNextEventCommon RunCurrentEventLoopInMode CFRunLoopRunSpecific __CFRunLoopRun __CFRunLoopDoSources() __CFRunLoopPerformPerform __NSFireMainThreadPerform -[MyController writeImageToFile:] <-- The method in my program is here -[NSImage TIFFRepresentation] -[NSImage TIFFRepresentationUsingCompression:factor:] -[NSImage _cacheRepresentation] -[NSImage _cacheRepresentation:stayFocused:] -[NSImage drawRepresentation] -[NSImage drawRepresentation:inRect:] -[NSCIImageRep drawAtPoint:] -[NSCIImageRep drawInRect:] -[CIContext drawImage:inRect:fromRect:] -[CICGContextImpl render:] CGContextDrawImage CGContextDelegateDrawImage 0x9475ccd0 0x9475e538 CGSImageDataLockWithReference img_data_lock CGAccessSessionGetBytePointer provider_get_byte_pointer provider_ensure_data fe_image_get_bitmap fe_image_render_ fe_tree_render_image fe_tree_render_image_ fe_tree_prepare_image fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_tree_expand_2 fe_context_promote_format fe_gl_buffer_format_p fe_accel_context fe_accel_context_ create_context fe_cgl_create_account allocate_context CGLCreateContext cglInitializeContext 0x15380b8 0x1538e14 0x153a980 0x153aa44 Roland

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Re: NSImage TIFFRepresentation memory leak
From: j o a r <email@hidden>
Re: NSImage TIFFRepresentation memory leak
From: Michael Watson <email@hidden>


References:  
  >NSImage TIFFRepresentation memory leak (From: Roland Torres <email@hidden>)
  >Re: NSImage TIFFRepresentation memory leak (From: j o a r <email@hidden>)




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