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libcamera: controls: Auto-generate control_ids.h and control_ids.cpp

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Bring back auto-generation of control ids. In this version, both the
header and the source files are generated from a single YAML file that
stores all control definitions. This allows centralising controls in a
single file, while the previous version required keeping both
declarations (in a header) and documentation (in a the source) in sync
manually.

Using YAML as a format to store control definitions is a trade-off
between ease of use (there are many YAML parsers available) and
simplicity (XML was considered, but would have lead to more complex
processing). A new build time dependency is added on python3-yaml, which
should be available as a package in all distributions and build
environments.

The YAML format is likely to change over time as we improve
documentation of controls, the first version simply copies the
information currently available. Future improvements should also include
a YAML schema to validate the YAML source file.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart 2019-09-29 14:24:09 +03:00
parent a8c40942b9
commit 8ea6912c96
11 changed files with 215 additions and 74 deletions
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Documentation/Doxyfile.in
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@ -793,7 +793,9 @@ WARN_LOGFILE =
INPUT = "@TOP_SRCDIR@/include/ipa" \
"@TOP_SRCDIR@/include/libcamera" \
"@TOP_SRCDIR@/src/libcamera"
"@TOP_SRCDIR@/src/libcamera" \
"@TOP_BUILDDIR@/include/libcamera" \
"@TOP_BUILDDIR@/src/libcamera"
# This tag can be used to specify the character encoding of the source files
# that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses