[VDPAU] about VdpPresentationQueueSetBackgroundColor

[Stephen Warren]

JuneyWang at viatech.com.cn wrote at Thursday, June 20, 2013 7:58 PM:
> Dear Stephen,
> 
> Thank you very much for your reply.
> Do you know why FlashPlayer sets alpha=1.0 but not sets to other values? What result does they want
> from their opinion?

Sorry, I don't have any insight into why Flash Player is putting any
particular value in the alpha channel. For the R/G/B components, I
expect they aren't "not setting" the other values, but rather they are
deliberately setting them to 0.0 in order to get a black background. I
don't recommend that since black is a rather common color, and that will
cause an overlay-based presentation queue to "show through" windows other
than the video window. A close-to-black-but-uncommon color would be a
better choice if you want a black background, or better yet, just don't
call this API.

> Best Wishes,
> JuneyWang
> 
> -----邮件原件-----
> 发件人: Stephen Warren [mailto:swarren at nvidia.com]
> 发送时间: 2013年6月20日 23:20
> 收件人: Juney Wang; vdpau at lists.freedesktop.org
> 主题: RE: about VdpPresentationQueueSetBackgroundColor
> 
> JuneyWang at viatech.com.cn wrote at Thursday, June 20, 2013 2:00 AM:
> > Dear,
> > I obtained your email on line. I’m sorry to interrupt you. I just want to ask a question.
> >
> > If I call VdpPresentationQueueSetBackgroundColor with a background color, what does the alpha member
> > mean？
> 
> The alpha member is ignored.
> 
> --
> nvpublic