> On May 27, 2020, at 1:08 PM, Gabriel Zachmann via Cocoa-dev
> <cocoa-dev@lists.apple.com> wrote:
>
>>>
>>> I've just had a crash in
>>> CGImageSourceCreateThumbnailAtIndex( new_image, 0, imageOpts );
>>
>> We went through this quite a while ago in private emails.
>> CGImageSourceCreateThumbnailAtIndex is fine to use from any thread. Are you
>> sure the image source even has an image at index 0? Not all do. What's the
>> crashed stack look like?
>
> I can't recall/reproduce, but it was definitely *inside*
> CGImageSourceCreateThumbnailAtIndex().
>
> If there is no image a tinder 0, shouldn't it just return NULL gracefully?
There can be valid arguments going either way. If you think it’s
acting inappropriately I’d suggest filing a bug with Apple.
—Rob
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