From c557de126e551133a345ae7bd8d1b58188769ac9 Mon Sep 17 00:00:00 2001
From: David Plowman <david.plowman@raspberrypi.com>
Date: Mon, 27 Mar 2023 13:20:24 +0100
Subject: ipa: raspberrypi: alsc: Replace std::vectors by Array2D class

The Array2D class is a very thin wrapper round std::vector that can be
used almost identically in the code, but it carries its 2D size with
it so that we aren't passing it around all the time.

All the std::vectors that were X * Y in size (X and Y being the ALSC
grid size) have been replaced. The sparse matrices that are XY * 4 in
size have not been as they are somewhat different, are used
differently, require more code changes, and actually make things more
confusing if everything looks like an Array2D but are not the same.

There should be no change in algorithm behaviour at all.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/ipa/raspberrypi/controller/rpi/alsc.h | 68 ++++++++++++++++++++++++++-----
 1 file changed, 57 insertions(+), 11 deletions(-)

(limited to 'src/ipa/raspberrypi/controller/rpi/alsc.h')

diff --git a/src/ipa/raspberrypi/controller/rpi/alsc.h b/src/ipa/raspberrypi/controller/rpi/alsc.h
index 85e998db..1ab61299 100644
--- a/src/ipa/raspberrypi/controller/rpi/alsc.h
+++ b/src/ipa/raspberrypi/controller/rpi/alsc.h
@@ -22,9 +22,55 @@ namespace RPiController {
 
 /* Algorithm to generate automagic LSC (Lens Shading Correction) tables. */
 
+/*
+ * The Array2D class is a very thin wrapper round std::vector so that it can
+ * be used in exactly the same way in the code but carries its correct width
+ * and height ("dimensions") with it.
+ */
+
+template<typename T>
+class Array2D
+{
+public:
+	using Size = libcamera::Size;
+
+	const Size &dimensions() const { return dimensions_; }
+
+	size_t size() const { return data_.size(); }
+
+	const std::vector<T> &data() const { return data_; }
+
+	void resize(const Size &dims)
+	{
+		dimensions_ = dims;
+		data_.resize(dims.width * dims.height);
+	}
+
+	void resize(const Size &dims, const T &value)
+	{
+		resize(dims);
+		std::fill(data_.begin(), data_.end(), value);
+	}
+
+	T &operator[](int index) { return data_[index]; }
+
+	const T &operator[](int index) const { return data_[index]; }
+
+	T *ptr() { return data_.data(); }
+
+	const T *ptr() const { return data_.data(); }
+
+	auto begin() { return data_.begin(); }
+	auto end() { return data_.end(); }
+
+private:
+	Size dimensions_;
+	std::vector<T> data_;
+};
+
 struct AlscCalibration {
 	double ct;
-	std::vector<double> table;
+	Array2D<double> table;
 };
 
 struct AlscConfig {
@@ -40,7 +86,7 @@ struct AlscConfig {
 	uint16_t minG;
 	double omega;
 	uint32_t nIter;
-	std::vector<double> luminanceLut;
+	Array2D<double> luminanceLut;
 	double luminanceStrength;
 	std::vector<AlscCalibration> calibrationsCr;
 	std::vector<AlscCalibration> calibrationsCb;
@@ -67,7 +113,7 @@ private:
 	AlscConfig config_;
 	bool firstTime_;
 	CameraMode cameraMode_;
-	std::vector<double> luminanceTable_;
+	Array2D<double> luminanceTable_;
 	std::thread asyncThread_;
 	void asyncFunc(); /* asynchronous thread function */
 	std::mutex mutex_;
@@ -93,8 +139,8 @@ private:
 	int frameCount_;
 	/* counts up to startupFrames for Process function */
 	int frameCount2_;
-	std::array<std::vector<double>, 3> syncResults_;
-	std::array<std::vector<double>, 3> prevSyncResults_;
+	std::array<Array2D<double>, 3> syncResults_;
+	std::array<Array2D<double>, 3> prevSyncResults_;
 	void waitForAysncThread();
 	/*
 	 * The following are for the asynchronous thread to use, though the main
@@ -105,15 +151,15 @@ private:
 	void fetchAsyncResults();
 	double ct_;
 	RgbyRegions statistics_;
-	std::array<std::vector<double>, 3> asyncResults_;
-	std::vector<double> asyncLambdaR_;
-	std::vector<double> asyncLambdaB_;
+	std::array<Array2D<double>, 3> asyncResults_;
+	Array2D<double> asyncLambdaR_;
+	Array2D<double> asyncLambdaB_;
 	void doAlsc();
-	std::vector<double> lambdaR_;
-	std::vector<double> lambdaB_;
+	Array2D<double> lambdaR_;
+	Array2D<double> lambdaB_;
 
 	/* Temporaries for the computations */
-	std::array<std::vector<double>, 5> tmpC_;
+	std::array<Array2D<double>, 5> tmpC_;
 	std::array<std::vector<std::array<double, 4>>, 3> tmpM_;
 };
 
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