From a82d08973f09f951e1de016ed8c1137663e7a58c Mon Sep 17 00:00:00 2001
From: David Plowman <david.plowman@raspberrypi.com>
Date: Mon, 27 Mar 2023 13:20:25 +0100
Subject: ipa: raspberrypi: alsc: Use a better type name for sparse arrays

The algorithm uses the data type std::vector<std::array<double, 4>> to
represent the large sparse matrices that are XY (X, Y being the ALSC
grid size) high but with only 4 non-zero elements on each row.

Replace this slightly long type name by SparseArray<double>.

No functional changes.

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 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(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 1ab61299..0b6d9478 100644
--- a/src/ipa/raspberrypi/controller/rpi/alsc.h
+++ b/src/ipa/raspberrypi/controller/rpi/alsc.h
@@ -68,6 +68,14 @@ private:
 	std::vector<T> data_;
 };
 
+/*
+ * We'll use the term SparseArray for the large sparse matrices that are
+ * XY tall but have only 4 non-zero elements on each row.
+ */
+
+template<typename T>
+using SparseArray = std::vector<std::array<T, 4>>;
+
 struct AlscCalibration {
 	double ct;
 	Array2D<double> table;
@@ -160,7 +168,7 @@ private:
 
 	/* Temporaries for the computations */
 	std::array<Array2D<double>, 5> tmpC_;
-	std::array<std::vector<std::array<double, 4>>, 3> tmpM_;
+	std::array<SparseArray<double>, 3> tmpM_;
 };
 
 } /* namespace RPiController */
-- 
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