From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Fri, 12 Oct 2012 20:56:13 +0000 (+0200)
Subject: Add a unit test for GammaCompressionEffect.
X-Git-Tag: 1.0~294
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=4b9b81cf1a7a4cd58de803c99f13e60ea0288969

Add a unit test for GammaCompressionEffect.
---

diff --git a/gamma_compression_effect_test.cpp b/gamma_compression_effect_test.cpp
new file mode 100644
index 0000000..4662a01
--- /dev/null
+++ b/gamma_compression_effect_test.cpp
@@ -0,0 +1,68 @@
+// Unit tests for GammaCompressionEffect.
+//
+// Pretty much the inverse of the GammaExpansionEffect tests;
+// EffectChainTest tests that they are actually inverses.
+
+#include "test_util.h"
+#include "gtest/gtest.h"
+#include "gamma_expansion_effect.h"
+
+TEST(GammaCompressionEffectTest, sRGB_KeyValues) {
+	float data[] = {
+		0.0f, 1.0f,
+		0.00309f, 0.00317f,   // On either side of the discontinuity.
+	};
+	float expected_data[] = {
+		0.0f, 1.0f,
+		0.040f, 0.041f,
+	};
+	float out_data[4];
+	EffectChainTester tester(data, 2, 2, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_sRGB);
+
+	expect_equal(expected_data, out_data, 2, 2);
+}
+
+TEST(GammaCompressionEffectTest, sRGB_RampAlwaysIncreases) {
+	float data[256], out_data[256];
+	for (unsigned i = 0; i < 256; ++i) {
+		data[i] = i / 255.0f;
+	}
+	EffectChainTester tester(data, 256, 1, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_sRGB);
+
+	for (unsigned i = 1; i < 256; ++i) {
+		EXPECT_GT(out_data[i], out_data[i - 1])
+		   << "No increase between " << i-1 << " and " << i;
+	}
+}
+
+TEST(GammaCompressionEffectTest, Rec709_KeyValues) {
+	float data[] = {
+		0.0f, 1.0f,
+		0.017778f, 0.018167f,  // On either side of the discontinuity.
+	};
+	float expected_data[] = {
+		0.0f, 1.0f,
+		0.080f, 0.082f,
+	};
+	float out_data[4];
+	EffectChainTester tester(data, 2, 2, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_REC_709);
+
+	expect_equal(expected_data, out_data, 2, 2);
+}
+
+TEST(GammaCompressionEffectTest, Rec709_RampAlwaysIncreases) {
+	float data[256], out_data[256];
+	for (unsigned i = 0; i < 256; ++i) {
+		data[i] = i / 255.0f;
+	}
+	EffectChainTester tester(data, 256, 1, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_REC_709);
+
+	for (unsigned i = 1; i < 256; ++i) {
+		EXPECT_GT(out_data[i], out_data[i - 1])
+		   << "No increase between " << i-1 << " and " << i;
+	}
+}