libcamera: Introduce camera sensor properties

Introduce a database of camera sensor properties, which contains
information on the camera sensor which are not possible, or desirable,
to retrieve from the device at run time.

The camera sensor database is accessed through a static function and
is indexed using the camera sensor model as reported by
properties::Model.

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

include/libcamera/internal/camera_sensor_properties.h

@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera_sensor_properties.h - Database of camera sensor properties
+ */
+#ifndef __LIBCAMERA_SENSOR_CAMERA_SENSOR_PROPERTIES_H__
+#define __LIBCAMERA_SENSOR_CAMERA_SENSOR_PROPERTIES_H__
+
+#include <string>
+
+#include <libcamera/geometry.h>
+
+namespace libcamera {
+
+struct CameraSensorProperties {
+	static const CameraSensorProperties *get(const std::string &sensor);
+
+	Size unitCellSize;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_SENSOR_CAMERA_SENSOR_PROPERTIES_H__ */

include/libcamera/internal/meson.build

@@ -15,6 +15,7 @@ libcamera_internal_headers = files([
     'byte_stream_buffer.h',
     'camera_controls.h',
     'camera_sensor.h',
+    'camera_sensor_properties.h',
     'control_serializer.h',
     'control_validator.h',
     'delayed_controls.h',