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-rw-r--r--src/ipa/libipa/exposure_mode_helper.h53
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diff --git a/src/ipa/libipa/exposure_mode_helper.h b/src/ipa/libipa/exposure_mode_helper.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
+ *
+ * exposure_mode_helper.h - Helper class that performs computations relating to exposure
+ */
+
+#pragma once
+
+#include <tuple>
+#include <utility>
+#include <vector>
+
+#include <libcamera/base/span.h>
+#include <libcamera/base/utils.h>
+
+namespace libcamera {
+
+namespace ipa {
+
+class ExposureModeHelper
+{
+public:
+ ExposureModeHelper(const Span<std::pair<utils::Duration, double>> stages);
+ ~ExposureModeHelper() = default;
+
+ void setLimits(utils::Duration minShutter, utils::Duration maxShutter,
+ double minGain, double maxGain);
+
+ std::tuple<utils::Duration, double, double>
+ splitExposure(utils::Duration exposure) const;
+
+ utils::Duration minShutter() const { return minShutter_; }
+ utils::Duration maxShutter() const { return maxShutter_; }
+ double minGain() const { return minGain_; }
+ double maxGain() const { return maxGain_; }
+
+private:
+ utils::Duration clampShutter(utils::Duration shutter) const;
+ double clampGain(double gain) const;
+
+ std::vector<utils::Duration> shutters_;
+ std::vector<double> gains_;
+
+ utils::Duration minShutter_;
+ utils::Duration maxShutter_;
+ double minGain_;
+ double maxGain_;
+};
+
+} /* namespace ipa */
+
+} /* namespace libcamera */