[Bug 15549] Colobot Demo installer does not fully redraw installation window during install progress phase

wine-bugs at winehq.org wine-bugs at winehq.org
Wed Oct 8 04:28:10 CDT 2008


http://bugs.winehq.org/show_bug.cgi?id=15549





--- Comment #3 from Robert Wm Ruedisueli <esd45 at earthlink.net>  2008-10-08 04:28:09 ---
(In reply to comment #2)
> 
> It's not clear what you mean by "backpaging", drawing "pages", and
> "architectural difference". Painting in Wine is implemented internally,
> and is triggered by repainting requests of applications and X expose events.
> 

yeah, back-paging is an old X11 extension term, I probably shouldn't be using
it.  I should use a more descriptive.  In fact I shouldn't even look at this
from a X11 server-side perspective, even if that's where I think the problem
is.

The best way to describe this is that there is a difference in behavior between
X11 and Windows.  Windows MANDATES that video drivers store the content of
windows that are behind other windows remain in video memory, through a complex
method.  

X11 implements this through an extension called "back paging" which it copies a
replica or "back page" of each window in an off screen buffer page, in the
video memory or memory allocated for quick transfer to the video card, in order
to restore if the program takes too long to do so itself, when called.  I
mentioned these memory pages above as pages.

Now an easy solution is best to render all wine windows using off screen
extensions than copy them to the screen.  This consumes a little more memory,
but actually saves processor time in redraws and properly replicates Win32
default behavior.

Sorry about taking the hardware-driver perspective without notice on a bug
report that was in software phrasing.


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