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wsdisplay framebuffer info
I'd like to add an ioctl() to wsdisplay which replaces
WSDISPLAYIO_GTYPE, WSDISPLAYIO_GINFO and WSDISPLAYIO_LINEBYTES by
returning a struct that gives a more complete and useful description of
the mappable framebuffer.
See attached patch for a preliminary proposal.
Pixel size and encoding are combined into a single value which can be
either split up or used in switch() statements - the latter is probably
going to be much more common.
This would take care of the following problems:
- the present ioctl()s don't tell us enough to actually draw into a
framebuffer - for example there is nothing about actual colour encoding
- because of this the xf86-video-wsfb driver ( and any other userland
tool that tries to draw into a framebuffer without actual hardware
knowledge ) can't really be all that generic - currently it has a pile
of code that tries to guess the pixel encoding from whatever
WSDISPLAYIO_GTYPE returns which doesn't help at all with new,
previously unsupported hardware.
The fbi_flags member is unused for now, it could encode things like
acceleration support ( using a yet to be defined interface ), hardware
cursor, overlays etc.
Anything I missed? Comments?
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