Software ISP TODOs

[Milan Zamazal]

Hi,

I have been working on some of the software ISP TODOs, here is an
overview of the current state, FYI.  See
https://git.libcamera.org/libcamera/libcamera.git/tree/src/libcamera/software_isp/TODO
for descriptions of the TODOs.

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1. Setting F_SEAL_SHRINK and F_SEAL_GROW after ftruncate()

Better to be addressed by someone who fully understands what's the right
thing to do.

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2. Reconsider stats sharing

3. Remove statsReady signal

5. Store ISP parameters in per-frame buffers

#2 + #5 part of the patches I work on (not yet posted but working for
me), maybe I'll handle #3 too, it's all WIP.

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6. Input buffer copying configuration

7. Performance measurement configuration

Part of the posted global configuration file patches.

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8. DebayerCpu cleanups

This is partially addressed by my patches, which compute the lookup
tables elsewhere and get rid of getStatsFd method at least.  But
DebayerCpu still keeps gathering stats, I don't think we can do much
about it.  I'd keep this TODO restricted to what can be reasonably done.
Let's also see what Bryan invents while working on DebayerGpu.

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8. Decouple pipeline and IPA naming

Better to be addressed by someone who knows what's the right thing to
do.

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9. Doxyfile cleanup

Not yet handled.

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10. Switch to libipa/algorithm.h API in processStats

11. Improve handling the sensor controls which take effect with a delay

12. Use DelayedControls class in ispStatsReady()

Part of the posted software ISP refactoring patches.

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13. Improve black level and colour gains application

I don't think we know how to resolve this (it's similar to #8 Debayer
cleanups) and I don't see this as urgent (e.g. the refactoring related
to #10-#12 is way more important for further work on software ISP).

Regards,
Milan