libipa: Centralise Fixed / Floating point convertors

The rkisp1 IPA has some utility functions to convert between fixed
and floating point numbers. Move those to libipa so they're available
for use in other IPA modules too.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/ipa/libipa/fixedpoint.cpp b/src/ipa/libipa/fixedpoint.cpp
new file mode 100644
index 00000000..6b698fc5
--- /dev/null
+++ b/src/ipa/libipa/fixedpoint.cpp
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
+ *
+ * Fixed / floating point conversions
+ */
+
+#include "fixedpoint.h"
+
+/**
+ * \file fixedpoint.h
+ */
+
+namespace libcamera {
+
+namespace ipa {
+
+/**
+ * \fn R floatingToFixedPoint(T number)
+ * \brief Convert a floating point number to a fixed-point representation
+ * \tparam I Bit width of the integer part of the fixed-point
+ * \tparam F Bit width of the fractional part of the fixed-point
+ * \tparam R Return type of the fixed-point representation
+ * \tparam T Input type of the floating point representation
+ * \param number The floating point number to convert to fixed point
+ * \return The converted value
+ */
+
+/**
+ * \fn R fixedToFloatingPoint(T number)
+ * \brief Convert a fixed-point number to a floating point representation
+ * \tparam I Bit width of the integer part of the fixed-point
+ * \tparam F Bit width of the fractional part of the fixed-point
+ * \tparam R Return type of the floating point representation
+ * \tparam T Input type of the fixed-point representation
+ * \param number The fixed point number to convert to floating point
+ * \return The converted value
+ */
+
+} /* namespace ipa */
+
+} /* namespace libcamera */