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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-03-20 00:53:51 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-03-20 16:47:45 +0200
commit0028536d70c79ebabf11f77cc2df965181509297 (patch)
treee41a356c2d3cd0b5efe41407949bb7dac1f94044 /src/v4l2
parent916df9e38d3af191853838ab4f2b0049ee207218 (diff)
libcamera: controls: Don't over-optimize ControlValue layout
The ControlValue class size should be minimized to save space, as it can be instantiated in large numbers. The current implementation does so by specifying several members as bitfields, but does so too aggressively, resulting in fields being packed in an inefficient to access way on some platforms. For instance, on 32-bit x86, the numElements_ field is offset by 7 bits in a 32-bit word. This additionally causes a static assert that checks the size of the class to fail. Relax the constraints on the isArray_ and numElements_ fields to avoid inefficient access, and to ensure that the class size is identical across all platforms. This will need to be revisited anyway when stabilizing the ABI, so add a \todo comment as a reminder. Fixes: 1fa4b43402a0 ("libcamera: controls: Support array controls in ControlValue") Reported-by: Jan Engelhardt <jengelh@inai.de> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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