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libcamera: controls: Use std::optional to handle invalid control values

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Previously, ControlList::get<T>() would use default constructed objects to
indicate that a ControlList does not have the requested Control. This has
several disadvantages: 1) It requires types to be default constructible,
2) it does not differentiate between a default constructed object and an
object that happens to have the same state as a default constructed object.

std::optional<T> additionally stores the information if the object is valid
or not, and therefore is more expressive than a default constructed object.

Signed-off-by: Christian Rauch <Rauch.Christian@gmx.de>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Christian Rauch
2022-07-05 10:55:48 +01:00
committed by Laurent Pinchart
parent ef77e26379
commit 1c4d480185
10 changed files with 44 additions and 44 deletions
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9
src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
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@@ -364,7 +364,7 @@ CameraConfiguration::Status RPiCameraConfiguration::validate()
* error means the platform can never run. Let's just print a warning
* and continue regardless; the rotation is effectively set to zero.
*/
int32_t rotation = data_->sensor_->properties().get(properties::Rotation);
int32_t rotation = data_->sensor_->properties().get(properties::Rotation).value_or(0);
bool success;
Transform rotationTransform = transformFromRotation(rotation, &success);
if (!success)
@@ -1718,7 +1718,8 @@ void RPiCameraData::statsMetadataComplete(uint32_t bufferId, const ControlList &
* V4L2_CID_NOTIFY_GAINS control (which means notifyGainsUnity_ is set).
*/
if (notifyGainsUnity_ && controls.contains(libcamera::controls::ColourGains)) {
libcamera::Span<const float> colourGains = controls.get(libcamera::controls::ColourGains);
libcamera::Span<const float> colourGains =
*controls.get(libcamera::controls::ColourGains);
/* The control wants linear gains in the order B, Gb, Gr, R. */
ControlList ctrls(sensor_->controls());
std::array<int32_t, 4> gains{
@@ -2053,7 +2054,7 @@ Rectangle RPiCameraData::scaleIspCrop(const Rectangle &ispCrop) const
void RPiCameraData::applyScalerCrop(const ControlList &controls)
{
if (controls.contains(controls::ScalerCrop)) {
Rectangle nativeCrop = controls.get<Rectangle>(controls::ScalerCrop);
Rectangle nativeCrop = *controls.get<Rectangle>(controls::ScalerCrop);
if (!nativeCrop.width || !nativeCrop.height)
nativeCrop = { 0, 0, 1, 1 };
@@ -2091,7 +2092,7 @@ void RPiCameraData::fillRequestMetadata(const ControlList &bufferControls,
Request *request)
{
request->metadata().set(controls::SensorTimestamp,
bufferControls.get(controls::SensorTimestamp));
bufferControls.get(controls::SensorTimestamp).value_or(0));
request->metadata().set(controls::ScalerCrop, scalerCrop_);
}