[osg-users] Deleting osg::Image that is shallow copied

[Christian Buchner]

looking at the osg::Image header file, it appears that the data storage is
not protected through reference counting.

        AllocationMode _allocationMode;
        unsigned char* _data;

the default allocation mode for an osg::Image is USE_NEW_DELETE, hence when
one instance of your shallow copy is destroyed, it will delete[] the _data
storage, making it unsafe to use from the 2nd instance.

You could force an allocation mode of NO_DELETE, so the osg::Image object
itself will never free its associated image data store - then your
application is responsible for freeing up these resources.

Christian



2016-08-16 12:35 GMT+02:00 Pierre-Jean Petitprez <
pierre-jean.petitprez at inria.fr>:

> Hi Sebastian,
>
> What do you mean by "reachable"? Deallocation doesn't mean the memory is
>> cleaned or something. So having a raw pointer to the deallocated memory
>> might give you the same data as long as no one is allocating memory there.
>>
>> I mean that after the first image is deleted, I still can use and perform
> operations on the data through the second image. To rewrite my question, I
> would like to know if data in an image is deallocated (and so it is not
> safe to perform operations on it through the second image) when it's
> shallow copied. I guess it is but I am not 100% sure.
>
> Thank you,
>
> Pierre-Jean
>
> Cheers
>> Sebastian
>>
>>>
>>> Thanks for enlightening me,
>>>
>>> Cheers,
>>> Pierre-Jean
>>>
>>> ------------------
>>> Read this topic online here:
>>> http://forum.openscenegraph.org/viewtopic.php?p=68380#68380
>>>
>>>
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