Elektrified X.org released (was: X configuration paradigm, and a proposal)

[Thomas Winischhofer]

Jim Gettys wrote:
>>>Resolution we now can handle using randr.
>>
>>Sort of.  RandR falls short in several ways:
>>
>>   1) video memory is always allocated for the largest size root
>>      window (maybe there is already a way for a driver to
>>      know when the amount of video memory can be freed and
>>      reallocated at the current resolution?)
> 
> 
> This is an implementation detail ;-).
> 
> Yes, we have to fix the implementation.  I'm not sure how painful
> that is.


One possible way to do this could be changing the fb manager code which 
currently assumes the root window at the beginning of the memory region 
available.

Perhaps it would be an easy start to change xf86InitFBManager() that it 
simply allocates the memory required for the root window instead of 
plainly REGION_SUBSTRACTing it. This function could return some sort of 
handle (like FBLinear), which then is to be used by the driver as a base 
for the x/y coordinates in AdjustFrame(). Of course, this approach 
assumes quite a bit of video RAM...


Thomas

-- 
Thomas Winischhofer
Vienna/Austria
thomas AT winischhofer DOT net	       *** http://www.winischhofer.net
twini AT xfree86 DOT org