Bug 12472 - UIImage.AsPNG and .AsJPEG(float) calls EnsureUIThread
Summary: UIImage.AsPNG and .AsJPEG(float) calls EnsureUIThread
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: 6.2.x
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2013-05-30 07:34 UTC by folex
Modified: 2013-06-03 18:16 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description folex 2013-05-30 07:34:45 UTC
It changed in Xamarin.iOS 6.2.6. But such UIKit function usually thread safe and these aren't exceptions. 
So, why ensuring UI thread?
Comment 1 Sebastien Pouliot 2013-05-30 08:20:49 UTC
We had a discussion with Apple engineers about the selectors/functions we marked as [ThreadSafe]. It turns out a few of them were wrong, i.e. not thread-safe. AsJPEG being one of them.
Comment 2 folex 2013-05-30 14:30:16 UTC
Sad. Do you know any case when AsJPEG or AsPNG will show it's "thread-not-safety"? Just curious. 
Thanks for response anyway.
Comment 3 Sebastien Pouliot 2013-05-30 15:28:43 UTC
After re-reading the emails I found out the answer was filtered, i.e. some items* were removed to show us only the non-thread safe methods/selectors.

* exactly those two UIImagePNGRepresentation and UIImageJPEGRepresentation - but I'll re-read the whole email thread again to be 100% sure we did not make another mistake.

Thanks a lot for reporting and asking details :-)

fixed in 9994a9dee8b65f0631cd260627e0d7fbb5a93d0c
Comment 4 Miguel de Icaza [MSFT] 2013-06-03 18:16:50 UTC
As Sebastien discovered, I misread the email, and those methods are thread safe.

A fix is now available on the stable channel.