Re: [Linux-fbdev-users] Question about cfb_copyarea

[Antonino A. D. <ad...@gm...>]

On Thu, 2007-02-22 at 12:43 +0100, Juergen Beisert wrote:
> On Thursday 22 February 2007 11:45, Antonino A. Daplas wrote:
> > > > The global 'logo_shown' is only used at the very start, to display the
> > > > boot logo if it is equal to LOGO_DRAW. It basically forces the scroll
> > > > mode to redraw and gives space in the upper part of your screen. After
> > > > that 'logo_shown' is assigned the index of the foreground console
> > > > (usually 0) and your scroll settings are now used.
> > >
> > > No, 0 is a valid index and always used in console 0. So my scroll
> > > settings in console 0 are never used.
> >
> > No, scroll_redraw is used if logo_shown = LOGO_DRAW.  After a switch, it
> > changes to logo_shown = fg_console = 0,  and this time your scroll
> > settings will be used.
> 
> So logo_shown will be set always to 0 for console 0, even if the logo is 
> disabled? What do you mean with "switch"? Switch to another console? Or 
> something else?
> 
> Maybe I missunderstand. In fbcon_scroll() I found:
> [...]
> 	if (logo_shown >= 0)
> 		goto redraw_up;

Yep, kinda weird how it goes. First, logo_shown = SHOW_LOGO. This adds
space at the top and the logo is drawn. Then logo_shown = fg_console,
which forces scroll mode to redraw.  Finally it becomes logo_shown =
DONTSHOW in fbcon_switch(), and the space above disappears and the
drivers scroll settings kick in.

Tony