Re: Threaded drawing
Re: Threaded drawing
- Subject: Re: Threaded drawing
- From: Sean McBride <email@hidden>
- Date: Wed, 04 Dec 2013 15:40:49 -0500
- Organization: Rogue Research Inc.
On Wed, 4 Dec 2013 21:33:16 +0100, Graham Cox said:
>NSView has -setCanDrawConcurrently, which, when you also permit this at
>the window level, will handle its -drawRect refreshes on a background
>thread. I’ve been experimenting with this to see if it yields any
>worthwhile gains,
I looked into to few years ago, but gave up when I discovered it doesn't (didn't?) support layer-backed views.
>but it doesn’t appear so - there seems to be a lock on
>the main thread that waits until the drawing thread has finished,
>presumably to synchronise the final window update. That being the case,
>it doesn’t improve responsiveness over drawing on the main thread, so I
>wonder whether there’s much point to this?
I think the idea is that several views can do their drawing independently on different threads, but the main thread waits for them all to be done. That limits you to the speed of your slowest view, but can help if you have several views that are all pretty slow.
I haven't seen concurrent drawing talked about in recent WWDC videos, so wonder about it really...
Cheers,
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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