1 files changed, 97 insertions, 0 deletions
diff --git a/src/py/libcamera/py_helpers.cpp b/src/py/libcamera/py_helpers.cpp
new file mode 100644
index 00000000..79891ab6
--- /dev/null
+++ b/src/py/libcamera/py_helpers.cpp
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+ */
+
+#include "py_helpers.h"
+
+#include <libcamera/libcamera.h>
+
+#include <pybind11/functional.h>
+#include <pybind11/stl.h>
+#include <pybind11/stl_bind.h>
+
+namespace py = pybind11;
+
+using namespace libcamera;
+
+template<typename T>
+static py::object valueOrTuple(const ControlValue &cv)
+{
+	if (cv.isArray()) {
+		const T *v = reinterpret_cast<const T *>(cv.data().data());
+		auto t = py::tuple(cv.numElements());
+
+		for (size_t i = 0; i < cv.numElements(); ++i)
+			t[i] = v[i];
+
+		return std::move(t);
+	}
+
+	return py::cast(cv.get<T>());
+}
+
+py::object controlValueToPy(const ControlValue &cv)
+{
+	switch (cv.type()) {
+	case ControlTypeBool:
+		return valueOrTuple<bool>(cv);
+	case ControlTypeByte:
+		return valueOrTuple<uint8_t>(cv);
+	case ControlTypeInteger32:
+		return valueOrTuple<int32_t>(cv);
+	case ControlTypeInteger64:
+		return valueOrTuple<int64_t>(cv);
+	case ControlTypeFloat:
+		return valueOrTuple<float>(cv);
+	case ControlTypeString:
+		return py::cast(cv.get<std::string>());
+	case ControlTypeRectangle:
+		return valueOrTuple<Rectangle>(cv);
+	case ControlTypeSize: {
+		const Size *v = reinterpret_cast<const Size *>(cv.data().data());
+		return py::cast(v);
+	}
+	case ControlTypeNone:
+		return py::none();
+	default:
+		throw std::runtime_error("Unsupported ControlValue type");
+	}
+}
+
+template<typename T>
+static ControlValue controlValueMaybeArray(const py::object &ob)
+{
+	if (py::isinstance<py::list>(ob) || py::isinstance<py::tuple>(ob)) {
+		std::vector<T> vec = ob.cast<std::vector<T>>();
+		return ControlValue(Span<const T>(vec));
+	}
+
+	return ControlValue(ob.cast<T>());
+}
+
+ControlValue pyToControlValue(const py::object &ob, ControlType type)
+{
+	switch (type) {
+	case ControlTypeBool:
+		return ControlValue(ob.cast<bool>());
+	case ControlTypeByte:
+		return controlValueMaybeArray<uint8_t>(ob);
+	case ControlTypeInteger32:
+		return controlValueMaybeArray<int32_t>(ob);
+	case ControlTypeInteger64:
+		return controlValueMaybeArray<int64_t>(ob);
+	case ControlTypeFloat:
+		return controlValueMaybeArray<float>(ob);
+	case ControlTypeString:
+		return ControlValue(ob.cast<std::string>());
+	case ControlTypeRectangle:
+		return controlValueMaybeArray<Rectangle>(ob);
+	case ControlTypeSize:
+		return ControlValue(ob.cast<Size>());
+	case ControlTypeNone:
+		return ControlValue();
+	default:
+		throw std::runtime_error("Control type not implemented");
+	}
+}