David Dawes wrote:
On Tue, May 03, 2005 at 12:53:43PM -0700, Mark Vojkovich wrote:
This stuff is HW specific so it needs to be done by the driver.
Looking through the i810 driver source code, it appears the i810
driver supports gamma but the i830 driver does not. I don't know
the reason behind that. Perhaps David Dawes knows. I see he's
worked on the i830 driver.
I no longer have access to the relevant documentation, and don't recall
if was omitted because of hardware limitations or other reasons. Someone
with access to the hardware specs should be able to provide a better answer
to this.
OK. Assuming that some cards don't have HW support for gamma
correction, that leaves owners of those cards with uncontrollable
displays.
I suppose I can split my question into 2; my real request
is (of course) for wonderful accurate screen display.
1) Can gamma correction be added/incorporated into the driver?
2) If the answer to (1) is no (for whatever reason) is it possible
(even if undesirable) to gamma compensate the data being sent
to the driver; it is clear that this approach will suffer from
range and quantisation issues, but it can't be (much) worse
than what I have at the moment, which is (judging by screen cards)
a non-negotiable gamma of 1.6, against a desired 2.2
Perhaps some kind of driver "decorator" ?
http://www.exciton.cs.rice.edu/JavaResources/DesignPatterns/DecoratorPattern.htm
BugBear
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