ipa: Move core IPA interface documentation to a .cpp file

Moving the core.mojom documentation to its corresponding .cpp file
(core_ipa_interface.cpp). This will allow Doxygen to generate the
documentation for IPABuffer, IPASettings and IPAStream structures.
Since the .mojom files are placed in include/ directory, the .cpp file
will live in $sourcedir/src/libcamera/ipa/ - which can also contain
documentation for other mojom generated IPA interfaces in subsequent
commit.

Also hide the constructors in generated IPA interface from doxygen,
via  #ifndef __DOXYGEN__. These constructors provide no major value in
documenting them, instead will spew out doxygen warnings during the
build.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Documentation/Doxyfile.in

@@ -844,7 +844,6 @@ EXCLUDE                = @TOP_SRCDIR@/include/libcamera/span.h \
 			 @TOP_SRCDIR@/src/libcamera/pipeline/ \
 			 @TOP_SRCDIR@/src/libcamera/tracepoints.cpp \
 			 @TOP_BUILDDIR@/include/libcamera/internal/tracepoints.h \
-			 @TOP_BUILDDIR@/include/libcamera/ipa/ \
 			 @TOP_BUILDDIR@/src/libcamera/proxy/
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
@@ -861,7 +860,12 @@ EXCLUDE_SYMLINKS       = NO
 # Note that the wildcards are matched against the file with absolute path, so to
 # exclude all test directories for example use the pattern */test/*
 
-EXCLUDE_PATTERNS       =
+EXCLUDE_PATTERNS       = @TOP_BUILDDIR@/include/libcamera/ipa/*_serializer.h \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/*_proxy.h \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/ipu3_*.h \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/raspberrypi_*.h \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/rkisp1_*.h \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/vimc_*.h \
 
 # The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
 # (namespaces, classes, functions, etc.) that should be excluded from the

Documentation/meson.build

@@ -24,6 +24,7 @@ if doxygen.found() and dot.found()
                       doxyfile,
                       libcamera_internal_headers,
                       libcamera_ipa_headers,
+                      libcamera_ipa_interfaces,
                       libcamera_public_headers,
                       libcamera_sources,
                       libipa_headers,