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Today's Topics:
1. (no subject) (Garrett Snider)
2. Re: (no subject) (Pierre-Olivier Latour)
----------------------------------------------------------------------
Message: 1
Date: Thu, 14 Jul 2005 18:08:40 -0400
From: Garrett Snider <email@hidden>
Subject: (no subject)
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Hello All,
How would I create a composition that is transparent, such that it
can be used as an overlay to a regular cocoa app? By default, the
background looks like it should be transparent, but shows up all
black. In my case, I want to display some text over a window
multiple QuickTime screens, showing status, etc.
Thanks,
-garrett
gs < at > pobox <dt > com
------------------------------
Message: 2
Date: Thu, 14 Jul 2005 15:47:57 -0700
From: Pierre-Olivier Latour <email@hidden>
Subject: Re: (no subject)
To: qc list <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
How would I create a composition that is transparent, such that
it can be used as an overlay to a regular cocoa app? By default,
the background looks like it should be transparent, but shows up
all black.
In QuickTime, the background of the composition is always painted
black, but the alpha channel is valid (it's actually transparent
black, so you can composite with it).
In other environments (QCRenderer or QCView), the background is not
painted black.
You can achieve transparency with a QCView if:
- the composition properly paints its background with a color with an
alpha component different than 1.0
- the alpha component of the erase color of the QCView is different
than 1.0
________________________________________________________
Pierre-Olivier Latour email@hidden
Quartz Composer Architect Graphics & Imaging Team
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End of Quartzcomposer-dev Digest, Vol 5, Issue 25
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