John,

    Hit me. :-)

    Cheers,

    PhiHo.

----- Original Message ----- 
From: "John M McIntosh" <johnmci at smalltalkconsulting.com>
To: <squeak-dev at lists.squeakfoundation.org>
Sent: Thursday, September 05, 2002 1:59 PM
Subject: making movies transparent


> Someone last week mumbled something about transparent movies.
> 
> So I changed the mpeg plugin to do two things
> 
> a) fill in a Alpha channel value, versus 0.
> b) An interface to supply a mapping table to map 0-255 to anything you 
> wish, IE blue screening. Tho running with a reversed mapping table is 
> kinda fun for a few minutes.
> 
> Why in the plugin?
> Faster. We already stick 0 in the alphachannel, and we already clip 
> values at the YUV to RGB color space translation so having a different 
> mapping table comes at no additional computational cost.
> 
> I'll need some windows folk to recompile and test on the windows 
> platform, those folks should step forward. Also I've NOT changed any of 
> the MMX related code so I'm not sure, actually I've not even looked if 
> this change affects thing in that area.
> 
> But unless I want to curl up with a good squeak image, I'm not sure how 
> to make the movie display morphic actually deal with transparency. I 
> noted it runs movies in 16 bit rgb, but if I change it to 32bit ARGB 
> then I don't get what I expected to see, a transparent Form.
> 
> Clues are welcome.
> 
>