[digikam] [Bug 508104] Add Fujifilm focus-point extractor support to digiKam

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=508104

--- Comment #9 from focus-point at mailinator.com ---
I tried different combination of focus settings and reached following
conclusions:

TLDR whichever focus shape and size settings in camera I tried, fujifilm always
returns single pixel location in metadata AND in playback screen camera always
uses the same fixed sized square frame to indicate focus area. So we need to
draw the same square around pixel location irregardless of focus settings
highlights different size and shapes.

Fujifilm has a feature called "focus check" that let you zoom into focused area
in playback screen. This feature can help us to determine the size of the frame
we need to draw around focus pixel.

I first tried camera setting of focusing on "single point" only to determine
focus frame size around the focus pixel. There is 3 sizes to choose for single
point size settings. However, whichever size I choose in settings, "focus
check" always zooms into middle size. This is the size I will assume best for
drawing focus frame around focus pixel. 

I have tried many combination of focus settings to see how they effect area we
need to draw frame around as well as metadata they return. However, all setting
combinations returns single focus pixel location AND the size of the focused
frame is the same in "focus check"!

So, even if focus setting is "zone" or all screen "wide" with multiple green
squares highlighted while shooting, fujifilm still returns single focus pixel
location in metadata and still shows the same medium sized square focus frame
in the "focus check" on playback screen! 

So, even if multiple green focus points highlighted while shooting, only one of
them is selected focus point! There is some metadata about focus zone settings
but they are irrelevant since we only need to draw single point, not bigger
inactive zone.

I also tried "AF-S", "AF-C", face/eye/subject AF focus settings with
combination with these. They too only return single focus pixel location in
metadata with the medium square sized focus frame in "focus check" in playback
screen (except there is face/subject recognition frame but digikam has this
feature).

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