Re: QTMovieLayer and renderInContext:
Re: QTMovieLayer and renderInContext:
- Subject: Re: QTMovieLayer and renderInContext:
- From: John Clayton <email@hidden>
- Date: Thu, 22 Nov 2007 10:07:50 +0100
:-)
Scott, I guess you *may* have seen my DTS support request for
CARenderer then? (I think it *is* very convoluted code [that I have],
I cant get the thing to go, its all new to me - but I'm willing to
learn).
I will file a bug report for this then, I have a spike/test solution
that demonstrates clearly that the rendering fails for a QTMovieLayer
that is calling renderInContext:
I guess I can fire you the question thats been hanging around in my
head since day 1 then (about 8 months ago actually). Q is this: how
would I use core-anim to render any CALayer tree onto a view, but only
at a particular time (i.e. 2.6 seconds) and also make use of all the
transitions and animations and so on [that core anim is good at
doing]? E.g. I have a complex CALayer and one of the contained layers
has an animation at 2 seconds for a duration of 5 seconds that fades
that layer out. (think: layers as movie timelines and using a slider
to scrub back and forth in time).
I've tried *a lot* of ways, and the basic problem appears to be
telling layers that they should indeed render for time 't', regardless
of what the CACurrentMediaTime() and underlying core-anim time-line is.
Anyways, I'll file a bug report along with my spike solution and let
you know its ID.
--
John Clayton
On Nov 22, 2007, at 9:48 AM, Scott Anguish wrote:
On Nov 22, 2007, at 3:22 AM, John Clayton wrote:
I'm not, that renderInContext: is a call on CALayer, allowing one
to place the content of a layer into a CGContextRef
Gah, sorry. I miss read the original email. I should have
recognized the method, I wrote the reference doc for it.
The CovertFlow example uses this technique to take content into a
bitmap based context.
Wow, it does. but I wonder why. It's just creating a bitmap with a
string in it.
I'm not sure whose example that is, but I've asked engineering.
If you determine that QTMovieLayer isn't rendering using that
method, please file a bug and let me know.
I've got requirements to basically render arbitrarily complex
CALayer hierarchies onto a view, but I want to render them for a
particular time.
What is CARenderer intended for then? (I've used CARenderer in
another different spike/test solution so have experience with it).
Yes, that would be a CARenderer situation. I've only seen one
example of it in use and it was, shall we say, convoluted.
Thanks.
--
John Clayton
http://www.coderage-software.com/
On Nov 22, 2007, at 9:11 AM, Scott Anguish wrote:
I'm not sure of the answer..
but why are you using CARenderer to put movie content into a view?
it shouldn't be used for display purposes.
On Nov 22, 2007, at 1:47 AM, John Clayton wrote:
Hi All,
I am trying to use the CALayer renderInContext: call to put the
contents of a QTMovieLayer instance onto a view, but I get a
blank view - nothing renders.
Is this call supposed to work for a QTMovieLayer? I suppose the
question could be expanded to: is the renderInContext: method
supposed to work for any type of open-gl based layer class?
Thanks,
--
John Clayton
http://www.coderage-software.com/
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