[Linux-fbdev-devel] video overlay in fbdev, take 3, plus fbcon question

[Romain D. <do...@ir...>]

Hello,

Here's a third draft of a possible interface for overlay support
in fbdev. I added a stride parameter suggested by Gerd Knorr,
and a way to specify a color or alpha key for overlay clipping/
blending. If someone is interested, I have a small app
that use the interface to put a JPG as video overlay
on the console.

I have a question on the subject of alpha: how is fbcon
and the driver supposed to deal with the alpha channel ?
Is the _clear function supposed to clear the alpha channel
or to left it alone ? What about the _putc, do they set
the alpha at a specific value (foreground and background),
or should they left the alpha alone ? Same question for invert,
too :-)

All this in case an app want to put some alpha to clip an
overlay...

TIA

-- 
DOLBEAU Romain               | l'histoire est entierement vraie, puisque
ENS Cachan / Ker Lann        |     je l'ai imaginee d'un bout a l'autre
do...@ir...             |           -- Boris Vian