RandR (etc) DriverFunc

[Thomas Winischhofer]

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Jim Gettys wrote:
| Note that the kdrive and XAA implementations of RandR differ.
|
| IIRC, resizing the actual frame buffer size in XAA would have presented
| a bunch of problems (Keith, do you remember exactly what?).  The cost of
| leaving things alone is not recovering frame buffer space, and inability
| to resize to a larger than initial root window size.


I can very well imagine what these problems are:

- - fb manager
- - xaa itself and the driver-side xaa stuff (no xaa call hands the fb
pitch to the driver; color expand buffer stride, etc)

I think, despite all this, it's still pretty usable ;)

Thomas



| Kdrive's implementation (which does not support virtual screens) is
| "correct".
| 				- Jim
|
|
| On Fri, 2005-03-18 at 16:37 +0100, Thomas Winischhofer wrote:
|
| Michel Dänzer wrote:
| | On Fri, 2005-03-18 at 11:54 +0100, Thomas Winischhofer wrote:
| |
| |>| Depending if an randr aware client has already connected at that
| |>| time you should be fine. I believe that the root window size gets
| |>| changed from within xf86RandrSetConfig() (from reading the code
| |>| very quickly) so any client that comes after that would be fine.
| |>
| |>
| |>No, the root window size is constant during the server session. RandR
| |>only changes the virtual screen dimensions.
| |
| |
| | And what is the root window size if not the virtual screen size? :)
| | Correct (for our DDX) would be I think: 'The maximum root window size is
| | constant during the server generation.'
|
| OK, to be more precise:
|
| The RandR extension only changes {pScreen,pScrn}->virtual? (and the
| pScreen->mm{width,height} fields), but not anything else. The root
| window is created immediately after all ScreenInit()'s and takes the
| original pScreen->virtual? for its size. And it stays in that size
| throughout server lifetime.
|
| Thomas
|
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- --
Thomas Winischhofer
Vienna/Austria
thomas AT winischhofer DOT net	       *** http://www.winischhofer.net
twini AT xfree86 DOT org
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