gstreamer: Move existing GValue helpers to gstreamer-utils

Move the existing GValue helpers from gstlibcamera-controls.cpp.in
to gstreamer-utils.cpp. The intention here is to make these helpers
available to other parts of gstreamer source element, for example,
reporting camera properties in GstDeviceProvider.

The function signature has been changed to match with the other
gstreamer-utils utility functions:

value_get_rectangle() =>  gst_libcamera_gvalue_get_rectangle()
value_set_rectangle() =>  gst_libcamera_gvalue_set_rectangle()
value_set_point()     =>  gst_libcamera_gvalue_set_point()
value_set_size()      =>  gst_libcamera_gvalue_set_size()

Signed-off-by: Umang Jain <uajain@igalia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/gstreamer/gstlibcamera-utils.cpp

@@ -579,6 +579,53 @@ void gst_libcamera_framerate_to_caps(GstCaps *caps, const GstStructure *element_
 	gst_structure_set(s, "framerate", GST_TYPE_FRACTION, fps_caps_n, fps_caps_d, nullptr);
 }
 
+void gst_libcamera_gvalue_set_point(GValue *value, const Point &point)
+{
+	GValue x = G_VALUE_INIT;
+	g_value_init(&x, G_TYPE_INT);
+	g_value_set_int(&x, point.x);
+	gst_value_array_append_and_take_value(value, &x);
+
+	GValue y = G_VALUE_INIT;
+	g_value_init(&y, G_TYPE_INT);
+	g_value_set_int(&y, point.y);
+	gst_value_array_append_and_take_value(value, &y);
+}
+
+void gst_libcamera_gvalue_set_size(GValue *value, const Size &size)
+{
+	GValue width = G_VALUE_INIT;
+	g_value_init(&width, G_TYPE_INT);
+	g_value_set_int(&width, size.width);
+	gst_value_array_append_and_take_value(value, &width);
+
+	GValue height = G_VALUE_INIT;
+	g_value_init(&height, G_TYPE_INT);
+	g_value_set_int(&height, size.height);
+	gst_value_array_append_and_take_value(value, &height);
+}
+
+void gst_libcamera_gvalue_set_rectangle(GValue *value, const Rectangle &rect)
+{
+	gst_libcamera_gvalue_set_point(value, rect.topLeft());
+	gst_libcamera_gvalue_set_size(value, rect.size());
+}
+
+Rectangle gst_libcamera_gvalue_get_rectangle(const GValue *value)
+{
+	const GValue *r;
+	r = gst_value_array_get_value(value, 0);
+	int x = g_value_get_int(r);
+	r = gst_value_array_get_value(value, 1);
+	int y = g_value_get_int(r);
+	r = gst_value_array_get_value(value, 2);
+	int w = g_value_get_int(r);
+	r = gst_value_array_get_value(value, 3);
+	int h = g_value_get_int(r);
+
+	return Rectangle(x, y, w, h);
+}
+
 #if !GST_CHECK_VERSION(1, 17, 1)
 gboolean
 gst_task_resume(GstTask *task)