libcamera: ipa: Raspberry Pi IPA

Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and
associated libraries.

All code is licensed under the BSD-2-Clause terms.
Copyright (c) 2019-2020 Raspberry Pi Trading Ltd.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/contrast_status.h b/src/ipa/raspberrypi/controller/contrast_status.h
new file mode 100644
index 00000000..d7edd4e9
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/contrast_status.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * contrast_status.h - contrast (gamma) control algorithm status
+ */
+#pragma once
+
+// The "contrast" algorithm creates a gamma curve, optionally doing a little bit
+// of contrast stretching based on the AGC histogram.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CONTRAST_NUM_POINTS 33
+
+struct ContrastPoint {
+	uint16_t x;
+	uint16_t y;
+};
+
+struct ContrastStatus {
+	struct ContrastPoint points[CONTRAST_NUM_POINTS];
+	double brightness;
+	double contrast;
+};
+
+#ifdef __cplusplus
+}
+#endif