Hi Alex :)
Thanks for the patch !
May I suggest that you change XV_GR_ALPHA and XV_OV_ALPHA to
XV_GRAPHICS_ALPHA and XV_OVERLAY_ALPHA ? This does not cost anything
in terms of performance.
best
Vladimir Dergachev
On Wed, 19 Nov 2003, Alex Deucher wrote:
> The attached patch adds alpha blending support to the video overlay on
> radeon hardware. It's been tested on my 9200. It adds three new Xv
> attributes: XV_ALPHA_MODE, XV_GR_ALPHA, and XV_OV_ALPHA.
>
> XV_ALPHA_MODE - (0 or 1) selects the alpha blending mode. right now it
> only supports key and global modes, per-pixel can be added later. 0 is
> key mode, 1 is global mode. Key mode blends the overlay or graphics
> layer with the colorkey. Global mode blends the graphics layer and the
> overlay.
>
> XV_GR_ALPHA - (0-255) set the alpha level of the graphics layer
> (everything but the overlay) (applies to either mode)
>
> XV_OV_ALPHA - (0-255) set the alpha level of the overlay (applies to
> either mode)
>
> The patch is against DRI cvs, but should apply pretty easily to any
> tree. I'm not 100% clear on the function the first two fields of
> OV0_KEY_CNTL, perhaps someone out there could explain it to me. see my
> comments in the code. let me know if you have any comments or
> questions. Is it worth opening a bug in bugzilla for this?
>
> The patch and binaries also are available here:
> http://www.botchco.com/alex/radeon/xv_alpha/
>
> Look out for an improved Xv gamma patch soon.
>
> Thanks,
>
> Alex
>
>
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