libcamera: camera_sensor: Initialize PixelArray properties

Initialize pixel array properties 'PixelArraySize' and
'PixelArrayActiveAreas' by inspecting the V4L2 CROP_BOUNDS and
CROP_DEFAULT selection targets.

The properties are registered only if the sensor subdevice support
the above mentioned selection targets.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 7e6995c4..1628ba9c 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -288,6 +288,25 @@ int CameraSensor::initProperties()
 		propertyValue = 0;
 	properties_.set(properties::Rotation, propertyValue);
 
+	Rectangle bounds;
+	ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_BOUNDS, &bounds);
+	if (!ret)
+		properties_.set(properties::PixelArraySize, bounds.size());
+
+	Rectangle crop;
+	ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_DEFAULT, &crop);
+	if (!ret) {
+		/*
+		 * V4L2_SEL_TGT_CROP_DEFAULT and V4L2_SEL_TGT_CROP_BOUNDS are
+		 * defined relatively to the sensor full pixel array size,
+		 * while properties::PixelArrayActiveAreas is defined relatively
+		 * to properties::PixelArraySize. Adjust it.
+		 */
+		crop.x -= bounds.x;
+		crop.y -= bounds.y;
+		properties_.set(properties::PixelArrayActiveAreas, { crop });
+	}
+
 	return 0;
 }