ipa: libipa: Add colour helpers

We start to have some functions relating to colour that are
effectively identical crop up across the IPA modules. Add a file
allowing those to be centralised within libipa so that a single
implementation can be used in all of the IPAs.

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

1 files changed, 21 insertions, 0 deletions

diff --git a/src/ipa/libipa/colours.h b/src/ipa/libipa/colours.h
new file mode 100644
index 00000000..b42ed0ac
--- /dev/null
+++ b/src/ipa/libipa/colours.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2024, Ideas on Board Oy
+ *
+ * libipa miscellaneous colour helpers
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+namespace libcamera {
+
+namespace ipa {
+
+double rec601LuminanceFromRGB(double r, double g, double b);
+uint32_t estimateCCT(double red, double green, double blue);
+
+} /* namespace ipa */
+
+} /* namespace libcamera */