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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-07-18 09:15:56 +0100
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-07-28 13:47:48 +0300
commit38987e165c2835d3d172be8a39c64c50903c86d6 (patch)
tree7d5aa193924139c376de98338d42870c51c68260 /Documentation/sensor_driver_requirements.rst
parent6724800f14bc603699cae41f7e588660135720ab (diff)
libcamera: yaml_parser: Preserve order of items in dictionary
The std::map container used to store dictionary items in YamlObject doesn't preserve the YAML data order, as maps are ordered by key, not by insertion order. While this is compliant with the YAML specification which doesn't guarantee ordering of mappings, the Raspberry Pi IPA relies on elements being ordered as in the YAML data. To replace the dependency on boost with the YamlParser class, we thus need to guarantee that the order is preserved. Preserve the order by storing items in list_ unconditionally. Turn the list_ vector from storing YamlObject unique pointers to storing key-value pairs, with the key being absent when the object is a list, not a dictionary. The YamlObject implementation is updated to preserve the existing API, with the only difference being that YamlObject::memberNames() now returns member names in the same order as in the YAML file. The ordering is an implementation detail, so changing it doesn't violate the YAML specification. The documentation is not updated to reflect this, as we don't want any new user to rely on a particular ordering. This commit could be reverted if desired when the Raspberry Pi IPA updates to a new tuning data format and drops support for the old format. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Tested-by: Naushir Patuck <naush@raspberrypi.com>
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