libcamera: properties: Add location property

Re-use the Control generation infrastructure to generate libcamera properties
and define the first 'Location' property.

Introduce three additional files:

- include/libcamera/property_ids.h
  Defines the properties ids

- src/libcamera/property_ids.cpp
  Defines the properties Control<> instances

- src/libcamera/property_ids.yaml
  Provide the first 'Location' property definition.

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

2 files changed, 50 insertions, 9 deletions

diff --git a/include/libcamera/meson.build b/include/libcamera/meson.build
index 8db217bb..f58c02d2 100644
--- a/include/libcamera/meson.build
+++ b/include/libcamera/meson.build
@@ -25,15 +25,23 @@ install_headers(libcamera_api,
 
 gen_controls = files('../../src/libcamera/gen-controls.py')
 
-control_ids_h = custom_target('control_ids_h',
-                              input : files('../../src/libcamera/control_ids.yaml', 'control_ids.h.in'),
-                              output : 'control_ids.h',
-                              depend_files : gen_controls,
-                              command : [gen_controls, '-o', '@OUTPUT@', '@INPUT@'],
-                              install : true,
-                              install_dir : join_paths('include', include_dir))
-
-libcamera_api += control_ids_h
+control_source_files = [
+    'control_ids',
+    'property_ids',
+]
+
+control_headers = []
+
+foreach header : control_source_files
+    input_files = files('../../src/libcamera/' + header +'.yaml', header + '.h.in')
+    control_headers += custom_target(header + '_h',
+                                     input : input_files,
+                                     output : header + '.h',
+                                     depend_files : gen_controls,
+                                     command : [gen_controls, '-o', '@OUTPUT@', '@INPUT@'],
+                                     install : true,
+                                     install_dir : join_paths('include', include_dir))
+endforeach
 
 gen_header = files('gen-header.sh')
 
diff --git a/include/libcamera/property_ids.h.in b/include/libcamera/property_ids.h.in
new file mode 100644
index 00000000..62799b3e
--- /dev/null
+++ b/include/libcamera/property_ids.h.in
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * property_ids.h : Property ID list
+ *
+ * This file is auto-generated. Do not edit.
+ */
+
+#ifndef __LIBCAMERA_PROPERTY_IDS_H__
+#define __LIBCAMERA_PROPERTY_IDS_H__
+
+#include <stdint.h>
+
+#include <libcamera/controls.h>
+
+namespace libcamera {
+
+namespace properties {
+
+enum {
+${ids}
+};
+
+${controls}
+
+extern const ControlIdMap properties;
+
+} /* namespace propertiess */
+
+} /* namespace libcamera */
+
+#endif // __LIBCAMERA_PROPERTY_IDS_H__