@@ -352,8 +352,7 @@ void V4L2Device::listControls()
ctrl.flags & V4L2_CTRL_FLAG_DISABLED)
continue;
- V4L2ControlInfo info(ctrl);
- switch (info.type()) {
+ switch (ctrl.type) {
case V4L2_CTRL_TYPE_INTEGER:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_MENU:
@@ -364,12 +363,14 @@ void V4L2Device::listControls()
break;
/* \todo Support compound controls. */
default:
- LOG(V4L2, Debug) << "Control type '" << info.type()
+ LOG(V4L2, Debug) << "Control type '" << ctrl.type
<< "' not supported";
continue;
}
- controls_.emplace(ctrl.id, info);
+ controls_.emplace(std::piecewise_construct,
+ std::forward_as_tuple(ctrl.id),
+ std::forward_as_tuple(ctrl));
}
}
The V4L2Device::listControls() method creates an instance of V4L2ControlInfo and then inserts it in the device's list of controls. The insertion uses std::map::emplace(), but passes the V4L2ControlInfo, resulting in a copy being performed (using the copy constructor of V4L2ControlInfo). Optimise this by really constructing the V4L2ControlInfo emplace. The use of std::piecewise_construct is required for gcc-5 that seems to have trouble with std::map::emplace() on non-copyable values in this case. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- src/libcamera/v4l2_device.cpp | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)