Re: [xmlvm-users] Releasing of CGBitmapContextRef / CGImageRef

[Arno P. <ar...@pu...>]

On 7/16/12 7:53 PM, JR Schmidt wrote:
> I am curious how CGBitmapContextRefs generated by
> CGBitmapContext.create() are handled, if at all.  A similar issue arises
> with CGImageRef created.

CGBitmapContext is derived from CFType. The latter overrides finalize(). 
The somewhat funny thing is that the code in 
org_xmlvm_iphone_CFType_finalize_org_xmlvm_iphone_CFType__() is 
commented out. Not sure how that happened.  :)

> So I am wondering:
> 1)  Is "CG" resource management being done in the c implementation? If
> so, how?

Yes, via CFType.finalize(), except that the CFRelease() is commented out 
in the C backend (I have no idea why).

> 2)  If no resource management is being done, is there a way to release
> them manually?  I fear that this will require modifying the c
> implementation, which looks extremely difficult.

It should be handled via the finalizer (in the C backend).

> 3)  Alternatively, is it possible to mix-and-match the objective c and c
> implementations of the XMLVM classes?  Writing the objective c
> implementations looks far more straightforward, but I still the c back
> end for full java classlib compatibility.

No. The ObjC backend relies on reference counting whereas the C backend 
comes with a proper GC. The two backends can't be mixed.

Arno