Hi all,
I have a question about setting screen modes - and exactly how a driver is
expected to handle this in a multiple screen system.
As far as I can tell, setting a surface on the primary layer should
trigger a screen mode change
( the system drivers (eg. fb,sdl) have entries for primarySetRegion()
and the implementations for these appear to make mode changes. )
>From the users point of view there is DSCID_PRIMARY which can be used to
configure the primary layer. I believe from the cores point of view this is
always the first layer in the system.
In my system, I have a "N screen x M layer" system and *all* layer handling
is done by the gfx driver - I dont expose an explicit primarySetRegion; so
the primary layer is treated no differently to any other layer.
For this reason, I currently expect modes for all screens to have been set
as required before the app is run, and resizing the primary layer just
moves it within the existing mode.
I'm thinking that I could add mode change support by extending my existing
generic layer SetRegion() function - when this is called for the first
layer in a screen, then I would set the new mode for that screen to the
layer (region) size.
Can anyone tell me,
- how does directfb choose a layer to become the primary - is it
always layer '0'?
- in which case, would allocating the first layer in the first screen
as the implicit primary as I've suggested be valid?
- furthermore, would allocating the first layer in every screen as
the 'mode defining layer' be correct and consistent (PRIMARY, SECONDARY,
... )?
Regards,
Jason Barstow.
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