what is the code in xserver/miext
ajax at nwnk.net
Tue Jun 27 08:04:40 PDT 2006
On Sunday 25 June 2006 14:22, Carlos Eduardo Rodrigues Diógenes wrote:
> The code in miext is a extension of the code in mi? This was created to
> addres what issues?
It was a poor choice of name. The miext name was supposed to indicate that
they were machine-independent extensions, ie, that the DDX need not be aware
of their existance. These days it's mostly a dumping ground for small
subsystems that don't have a protocol extension associated with them.
> What the code in xserver/miext/shadow is intended for? Why this was
Shadow rendering buffers. Occasionally you want to render to an intermediate
surface before finally presenting it to the app or the user. An example
would be unaccelerated rotation support for when the driver can't accelerate
> When these where inserted in the xserver code tree?
I think the original creation of the miext directory was back around XFree86
4.1 or so, when Keith Packard originally wrote the shadow and (now-deleted)
layer code. This, if I'm remembering my mythology right, was an initial
attempt at creating a composited window system entirely within the server.
That it's now deleted, should give you an indication of how well it worked.
The shadow code was useful on its own though.
miext/rootless was added for the Darwin DDX, and later significantly munged to
support the Cygwin DDX and expose an acceleration layer. miext/cw was the
newest addition, which ostensibly hides the composite infrastructure from the
DDX; this was seen as being preferable to hacking up XAA.
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