Import Snapshot in iOS

[Mark Wilcox]

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
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