libcamera: software_isp: Add SwStatsCpu class

Add a CPU based SwStats implementation for SoftwareISP / SoftIPA use.

This implementation offers a configure function + functions to gather
statistics on a line by line basis. This allows CPU based software
debayering to call into interleave debayering and statistics gathering
on a line by line basis while the input data is still hot in the cache.

This implementation also allows specifying a window over which to gather
statistics instead of processing the whole frame.

Doxygen documentation by Dennis Bonke.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # sc8280xp Lenovo x13s
Tested-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Co-developed-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Co-developed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Co-developed-by: Dennis Bonke <admin@dennisbonke.com>
Signed-off-by: Dennis Bonke <admin@dennisbonke.com>
Co-developed-by: Marttico <g.martti@gmail.com>
Signed-off-by: Marttico <g.martti@gmail.com>
Co-developed-by: Toon Langendam <t.langendam@gmail.com>
Signed-off-by: Toon Langendam <t.langendam@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/src/libcamera/software_isp/swstats_cpu.h b/src/libcamera/software_isp/swstats_cpu.h
new file mode 100644
index 00000000..27b15756
--- /dev/null
+++ b/src/libcamera/software_isp/swstats_cpu.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2023, Linaro Ltd
+ * Copyright (C) 2023, Red Hat Inc.
+ *
+ * Authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ *
+ * swstats_cpu.h - CPU based software statistics implementation
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include <libcamera/base/signal.h>
+
+#include <libcamera/geometry.h>
+
+#include "libcamera/internal/shared_mem_object.h"
+#include "libcamera/internal/software_isp/swisp_stats.h"
+
+namespace libcamera {
+
+class PixelFormat;
+struct StreamConfiguration;
+
+class SwStatsCpu
+{
+public:
+	SwStatsCpu();
+	~SwStatsCpu() = default;
+
+	bool isValid() const { return sharedStats_.fd().isValid(); }
+
+	const SharedFD &getStatsFD() { return sharedStats_.fd(); }
+
+	const Size &patternSize() { return patternSize_; }
+
+	int configure(const StreamConfiguration &inputCfg);
+	void setWindow(const Rectangle &window);
+	void startFrame();
+	void finishFrame();
+
+	void processLine0(unsigned int y, const uint8_t *src[])
+	{
+		if ((y & ySkipMask_) || y < static_cast<unsigned int>(window_.y) ||
+		    y >= (window_.y + window_.height))
+			return;
+
+		(this->*stats0_)(src);
+	}
+
+	void processLine2(unsigned int y, const uint8_t *src[])
+	{
+		if ((y & ySkipMask_) || y < static_cast<unsigned int>(window_.y) ||
+		    y >= (window_.y + window_.height))
+			return;
+
+		(this->*stats2_)(src);
+	}
+
+	Signal<> statsReady;
+
+private:
+	using statsProcessFn = void (SwStatsCpu::*)(const uint8_t *src[]);
+
+	void statsBGGR10PLine0(const uint8_t *src[]);
+	void statsGBRG10PLine0(const uint8_t *src[]);
+
+	/* Variables set by configure(), used every line */
+	statsProcessFn stats0_;
+	statsProcessFn stats2_;
+	bool swapLines_;
+
+	unsigned int ySkipMask_;
+
+	Rectangle window_;
+
+	Size patternSize_;
+
+	unsigned int xShift_;
+
+	SharedMemObject<SwIspStats> sharedStats_;
+	SwIspStats stats_;
+};
+
+} /* namespace libcamera */