Rotation in image Exif data not parsed

[David Carlisle]

On Wed, 30 Oct 2024 at 01:04, Max Chernoff via tex-live <tex-live at tug.org>
wrote:

> LuaTeX already exposes the Exif orientation data,

hmm so a viable option (rather than make pdftex call extractbb all the
time) would be to just implement this in latex's graphics driver
for luatex and a package option to turn this off or on (we can discuss
whether to default off or on).  the option could warn that it's being
ignored
for anything other than luatex.

If at some future date extractbb exposes the rotation via some method (a
line with a new comment form presumably?) in the .xbb file either by using
the Lua version or changing the current c code, other latex back ends could
support that too.


If extractbb was changed it would probably be slightly more convenient if
it continued to expose the unrotated bounding box and just information
about the intended rotation, rather than updating the bounding box. (this
would make more difference for 90 degree than 180 degree rotations of
course)


David
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