Re: QC in FxPlug
Re: QC in FxPlug
- Subject: Re: QC in FxPlug
- From: Darrin Cardani <email@hidden>
- Date: Thu, 31 Jul 2008 15:03:06 -0700
On Jul 31, 2008, at 11:07 AM, David Yamnitsky wrote:
I've been trying to render out Quartz Composer compositions into
FxPlug using a QCRenderer, and have had a lot of success by first
rendering the composition to an FBO, and then drawing the output to
the actual destination. To avoid this unnecessary step, I've been
hoping to draw using the QCRenderer directly, and have gotten it
working properly in Motion, but in FCP it's been more difficult.
First of all, the coordinate system is flipped, so all rendering is
flipped (except drawing of the input image (for an FxFilter)).
This can usually be dealt with by either setting your transformation
matrix correctly, or if you're operating directly on the pixels
yourself, you can use something along the lines of:
y = height - y;
With my FBO implementation, rendering scale, pixel aspect ratio, and
half height fields were all handled because I could control the
context of the FBO.
How would I handle all those directly? I've done several tests and
found that the "Rendering Destination Dimensions" in QC do not
reflect those considerations.
See the example plugin called Scrolling Rich Text. It describes how to
deal with all of these things in your code.
Darrin
--
Darrin Cardani
email@hidden
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| | >QC in FxPlug (From: "David Yamnitsky" <email@hidden>) |