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Updating a screensaver from 10.6 to 10.10
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Updating a screensaver from 10.6 to 10.10


  • Subject: Updating a screensaver from 10.6 to 10.10
  • From: Gabriel Zachmann <email@hidden>
  • Date: Sun, 26 Jul 2015 23:11:37 +0200

Dear all,

I have written a screensaver , but unfortunately, I didn't have the time to update the source code sine OS X 10.7 .
It is still working so-so, but showing signs of code aging.

Now I would like to bring the source code up to date.

Does anybody know of some guidelines , or a list of hints, or any other document anywhere, that would outline the exact changes
I need to do.
In particular, I'd like to learn more about the changes needed in CoreAnimation, in Scripting Bridge to retrieve photos from iPhoto-now-Photos,
and the way I identify the current display/monitor.
Below are a few code snippets, for your information.

And I am interesting in anything else you might deem worthy of upgrading in the source code.

Thanks a lot in advance.

Best regards,
Gabriel.



-------------
Code snippet I used to make a layer (containing only one image) cross-dissolve with a new one:

	[CATransaction begin];
	if ( crossDissolve_ )
          [CATransaction setAnimationDuration: fading_duration];
	else
          [CATransaction setValue: (id)kCFBooleanTrue forKey: kCATransactionDisableActions];
	[mainLayer_ replaceSublayer: currentLayer_ with: newlayer];
	currentLayer_ = newlayer;
	[CATransaction commit];

------------------
Code snippet I used to identify monitors/displays (this seems to fail since OS X 10.9 ):

	displayNumber_ = [ [[newWindow screen] deviceDescription] objectForKey: @"NSScreenNumber"];
	displayID_ = [displayNumber_ unsignedIntValue];
	unsigned int main_screen_id = [[ [[NSScreen mainScreen] deviceDescription] objectForKey: @"NSScreenNumber"] unsignedIntValue];

I suspect , this code does not work any more as intended, because I get often a new display ID for exactly the same monitor (just a cinema display).



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