test: ipa: libipa: Add tets for Interpolator

Add tests for the Interpolator class.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

test/ipa/libipa/interpolator.cpp

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2024, Ideas on Board Oy
+ *
+ * Interpolator tests
+ */
+
+#include "../src/ipa/libipa/interpolator.h"
+
+#include <cmath>
+#include <iostream>
+#include <map>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+using namespace ipa;
+
+#define ASSERT_EQ(a, b)                    \
+	if ((a) != (b)) {                  \
+		printf(#a " != " #b "\n"); \
+		return TestFail;           \
+	}
+
+class InterpolatorTest : public Test
+{
+protected:
+	int run()
+	{
+		Interpolator<int> interpolator;
+		interpolator.setData({ { 10, 100 }, { 20, 200 }, { 30, 300 } });
+
+		ASSERT_EQ(interpolator.getInterpolated(0), 100);
+		ASSERT_EQ(interpolator.getInterpolated(10), 100);
+		ASSERT_EQ(interpolator.getInterpolated(20), 200);
+		ASSERT_EQ(interpolator.getInterpolated(25), 250);
+		ASSERT_EQ(interpolator.getInterpolated(30), 300);
+		ASSERT_EQ(interpolator.getInterpolated(40), 300);
+
+		interpolator.setQuantization(10);
+		unsigned int q = 0;
+		ASSERT_EQ(interpolator.getInterpolated(25, &q), 300);
+		ASSERT_EQ(q, 30);
+		ASSERT_EQ(interpolator.getInterpolated(24, &q), 200);
+		ASSERT_EQ(q, 20);
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(InterpolatorTest)

test/ipa/libipa/meson.build

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libipa_test = [
+    {'name': 'interpolator', 'sources': ['interpolator.cpp']},
+]
+
+foreach test : libipa_test
+    exe = executable(test['name'], test['sources'],
+                     dependencies : [libcamera_private, libipa_dep],
+                     link_with : [test_libraries],
+                     include_directories : [test_includes_internal,
+                                            '../../../src/ipa/libipa/'])
+
+    test(test['name'], exe, suite : 'ipa')
+endforeach

test/ipa/meson.build

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: CC0-1.0
 
+subdir('libipa')
 subdir('rkisp1')
 
 ipa_test = [