Import Snapshot in iOS

[Roger Guay]

I am always amazed at the talent on this list! Indeed, I am getting a black image if I set a-R true. OTH, John Dixon's stack works! What's up with that?

Roger


On May 14, 2013, at 1:13 PM, Mark Wilcox <m_p_wilcox at yahoo.co.uk> wrote:

> I looked up the iOS snapshot code.  It looks to me as if it renders the contents of the window into a bitmap context.  I've written my own screen snapshot and video recording code on iOS and this doesn't capture the contents of a view/window drawn directly with OpenGL - for that you need to read back the pixels from the hardware graphics accelerator directly.
> 
> So if my understanding of "accelerated rendering" is correct, then this shouldn't work - if LiveCode didn't block you making the call in that mode, you should get back a black image. 
> 
> I'm hoping to find out how to trace my way down from a command to the code that implements it in a workshop on Thursday.  Curious to look at this one some more when I understand the code better.
> 
> Mark
> 
> 
> ________________________________
> From: Roger Guay <irog at mac.com>
> To: How to use LiveCode <use-livecode at lists.runrev.com> 
> Sent: Tuesday, 14 May 2013, 19:59
> Subject: Re: Import Snapshot in iOS
> 
> 
> Richard,
> 
> I presume you were asking anyone on the list. I, for one, do not know!
> 
> Roger
> 
> 
> On May 14, 2013, at 9:37 AM, Richard Gaskin <ambassador at fourthworld.com> wrote:
> 
>> Ender Nafi wrote:
>>> Roger's right.
>>> It's an odd thing but setting the a-R to true prohibits importing snapshots.
>>> Commenting it out fixes the issue.
>>> Not tested in LiveCode 6.0.1, though…
>> 
>> That's not mentioned in the Dictionary.  Is that a documentation bug, or does it only affect the older method of importing snapshots by rect while still allowing the new method of making snapshots from object references?
>> 
>> --
>> Richard Gaskin
>> Fourth World
>> LiveCode training and consulting: http://www.fourthworld.com
>> Webzine for LiveCode developers: http://www.LiveCodeJournal.com
>> Follow me on Twitter:  http://twitter.com/FourthWorldSys
>> 
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