Rendering transparent layers to SDI output

Rendering transparent layers to SDI output

Post by Tommy.Vanh » Sat, 14 May 2005 22:15:24

I need to get started on a project, supposed to render graphical
objects via SDI (vid + keying) to a tv screen, thus being transparent
except for the rendered part...

Like a channel logo on a TV for example...

I was wandering if it is possible to do this by building my own custom
platform using a NVidia Quadro FX4000 SDI.
If it is would I be doing it in OpenGL/VB/C++? Or do I need a third
party development kit?

I need to combine 4 seperate layers (overlay)! Objects that need to be
rendered are TIFF/DIFF/TARGA files and AVI (dv codec) for

If someone has some experience with realtime rendering of such objects,
please help me out. Thank you!

1. making child window non transparent when parent is layered and transparent

2. Transparent CFrame in SDI application

Hi, I have a pretty complex problem, let me explain a little.

I am making an SDI application and I am trying to create a kind of skin
for this application.

In may main view's OnDraw, I am Drawing some PNG images that makes the
border that have a semi transparent effect on the edges.

My problem is how do I make the backframe transparent. I was able to
obtain some kind of result by ovverriding the view's OnEraseBackground
method by simply not doing anything in the method. But the problem is
that as soon as I move the window, the semi-transparent region does not
get redrawn, so the graphics from the applications below gets moved
around with the window.

As soon as I minimize/maximize the window or cover it by another window,
it gets redrawn properly.

what kind of message should I send to the window to only get the region
around my borders refreshed?

Is this got to do with the Mainframe containing the View or should I
only deal with the view?

Thanks for any help!


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