From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Fri, 12 Oct 2012 20:52:28 +0000 (+0200)
Subject: Add unit tests for Rec. 709 gamma expansion.
X-Git-Tag: 1.0~295
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=e8b8c6c9dbb4c5c68b70f43f45764e8dac404bff;ds=sidebyside

Add unit tests for Rec. 709 gamma expansion.
---

diff --git a/gamma_expansion_effect_test.cpp b/gamma_expansion_effect_test.cpp
index 0fd9a71..b315d8f 100644
--- a/gamma_expansion_effect_test.cpp
+++ b/gamma_expansion_effect_test.cpp
@@ -33,3 +33,33 @@ TEST(GammaExpansionEffectTest, sRGB_RampAlwaysIncreases) {
 		   << "No increase between " << i-1 << " and " << i;
 	}
 }
+
+TEST(GammaExpansionEffectTest, Rec709_KeyValues) {
+	float data[] = {
+		0.0f, 1.0f,
+		0.080f, 0.082f,  // On either side of the discontinuity.
+	};
+	float expected_data[] = {
+		0.0f, 1.0f,
+		0.017778f, 0.018167f,
+	};
+	float out_data[4];
+	EffectChainTester tester(data, 2, 2, COLORSPACE_sRGB, GAMMA_REC_709);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, 2, 2);
+}
+
+TEST(GammaExpansionEffectTest, 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_REC_709);
+	tester.run(out_data, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	for (unsigned i = 1; i < 256; ++i) {
+		EXPECT_GT(out_data[i], out_data[i - 1])
+		   << "No increase between " << i-1 << " and " << i;
+	}
+}