On Sun, 22 Feb 2009, Hans de Goede wrote:
<big snip>
Yes that is what we are talking about, the camera having a gravity switch
(usually nothing as advanced as a gyroscope). Also the bits we are talking
about are in a struct which communicates information one way, from the camera
to userspace, so there is no way to clear the bits to make the camera do
something.
Regards,
Hans
Well, of course the bits are in a struct which is communicates information
one way from the camera to userspace. But userspace can do what it deems
appropriate with those bits. My point was that if userspace wants to turn
the camera upside down in software, all it has to do is to negate those
bits. For that purpose, it does not matter whether the bits were
originally set "on" (indicating that the sensor is upside down in the
camera) or whether they were set "off" (indicating the sensor is right
side up in the camera). Now, if it is a question of passing along a
changing camera orientation, it is obvious that has to be done with some
other mechanism. So, unless my not terribly profound observation about
the ability to negate bits was confusing, we are not in disagreement.
Theodore Kilgore
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