[MPlayer-dev-eng] Removal of backing store

[Stephane Marchesin]

On Sat, Aug 23, 2008 at 12:25 PM, Reimar Döffinger
<Reimar.Doeffinger at stud.uni-karlsruhe.de> wrote:
> On Sat, Aug 23, 2008 at 02:25:18AM +0200, Stephane Marchesin wrote:
>> On Fri, Aug 22, 2008 at 9:02 AM, Reimar Doeffinger
>> <Reimar.Doeffinger at stud.uni-karlsruhe.de> wrote:
>> > I guess your opinion is that nouveau is behaving as it should, but without
>> > arguments it is a weak position to change code that has worked well for many
>> > years and nobody might truly no what kind of effects changing it might really
>> > have (e.g. does disabling backing store not mean that MPlayer will have to redraw
>> > the window each time it is moved instead of possibly using 2D acceleration
>> > during the moving? If so, this might cause flickering).
>>
>> Backing store doesn't affect Xv windows.
>
> That is contradicting yourself, if it didn't affect Xv windows there
> would be no need to disable it.
> Maybe it does indeed not affect the colorkey-drawing, that is possible,
> but I have no clue.

When you have a hw overlay, backing store affects only the colorkey,
not the video pixels. If the purpose of the backing store in mplayer
is to repaint the colorkey, automatic colorkey repainting handles it
for you.

> I'll try to find time to test on my old PC.
>
>> Really, I don't understand why you refuse to change that flag. It buys
>> you nothing, and makes some driver/hw combinations slower. So what's
>> the point ?
>
> Well, I am still trying to find out if it indeed will never have any
> advantage. I tend to assume there would be some reason why it was
> enabled in the first place (though that reason may well have been
> cluelessness).

I really don't know why it's in there, as I said neither VLC nor Xine use it.

Stephane