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Quartz effects
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Grizzled Veteran
Join Date: Jul 2001
Location: Sydney, Australia
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I haven't really done any programming but i'm fascinated as to what effects are currently available under quartz. We have opacity obviously, which is frequently used (and somewhat overused - every other shareware app having an opacity slider somewhere in the prefs), vector transform (dock effects), and rotation. That's all I know of off the top of my head.
How do applications like Quicksilver get the special effects they have, as I don't think it's a Core Image function. Are things like transparency + blur possible? (aka vista window titles) I'm sure IE 5 used to do that with the location bar...
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You can't eat all those hamburgers, you hear me you ridiculous man?
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Mac Elite
Join Date: Dec 2000
Location: Northern California
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Originally Posted by qnxde
I'm sure IE 5 used to do that with the location bar...
In fact it still does (if anyone still has it around... I have it, shame on me  ).
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Mac OS X 10.5.0, Mac Pro 2.66GHz/2 GB RAM/X1900 XT, 23" ACD
esdesign
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Mac Elite
Join Date: Aug 2001
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Originally Posted by qnxde
I haven't really done any programming but i'm fascinated as to what effects are currently available under quartz. We have opacity obviously, which is frequently used (and somewhat overused - every other shareware app having an opacity slider somewhere in the prefs), vector transform (dock effects), and rotation. That's all I know of off the top of my head.
How do applications like Quicksilver get the special effects they have, as I don't think it's a Core Image function. Are things like transparency + blur possible? (aka vista window titles) I'm sure IE 5 used to do that with the location bar...
A lot of is done via transformation matrices and opacity tricks. The rest is either custom animations (pre-10.4), or CI effects which can do basically anything OpenGL shaders can do. My vague memory is that Quicksilver relies on a bunch of undocumented/private effect APIs.
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Fresh-Faced Recruit
Join Date: Apr 2005
Location: Newcastle, Australia
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QS uses CGS (undocumented) APIs to do it's wizardry, just like my app, VirtueDesktops. Unfortunately for CoreImage, CGS is still a lot, lot faster (to my untrained eye) for the glitzy effects as used by the Dock and fast user switching.
I'd love Apple to prove me wrong in 10.5, as I'm itching to use CoreImage transitions in VirtueDesktops...
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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Originally Posted by qnxde
I'm sure IE 5 used to do that with the location bar...
IE 5 must have had its own code to do that, since it did that even on Mac OS 9.
tooki
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Clinically Insane
Join Date: Oct 2001
Location: San Diego, CA, USA
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If I recall correctly, IE 5 took a snapshot of the desktop under the menu and blurred that. It wasn't a live effect.
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Chuck
___
"Instead of either 'multi-talented' or 'multitalented' use 'bisexual'."
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Mac Elite
Join Date: Aug 2001
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Originally Posted by Tony Arnold
Unfortunately for CoreImage, CGS is still a lot, lot faster (to my untrained eye)
Out of curiosity, what GPU are you using?
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Fresh-Faced Recruit
Join Date: Apr 2005
Location: Newcastle, Australia
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Last time I tested was the Radeon 9600 in my 17" PowerBook. Haven't had a chance to play with CoreImage on my MacBook Pro yet  I'm hoping it's a big difference, cause CI was slow on my PowerBook.
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Mac Elite
Join Date: Jul 2002
Status:
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CI does have problems when it comes to taking full advantage of advanced GPUs. Hopefully this will be rectified to some extent in Leopard.
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Mac Elite
Join Date: Aug 2001
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Originally Posted by Thinine
CI does have problems when it comes to taking full advantage of advanced GPUs. Hopefully this will be rectified to some extent in Leopard.
The 9600 is not a terribly advanced GPU in terms of shader programmability. I'd say that one of the major problems with CI is that it requires more advanced GPUs than are in most Macs (although I agree CI is not the most efficient way to use a GPU's resources, true).
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