Add unit tests for Rec. 709 gamma expansion.

diff --git a/gamma_expansion_effect_test.cpp b/gamma_expansion_effect_test.cpp
index 0fd9a71dd57518e8b28fba15268a7690fa2754b6..b315d8f9c6fc05d2ca2a0bd2a875b9d23ecc8797 100644 (file)
--- 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;
        }
 }
                   << "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;
+       }
+}