Fix some outdated comments in GammaExpansionEffect.

[movit] / gamma_compression_effect_test.cpp

diff --git a/gamma_compression_effect_test.cpp b/gamma_compression_effect_test.cpp
index 6211acc0089afab3d0f21a97dcff0bf77daf0a23..e65acee34e4974b6c8a2a500a15556b5255c982e 100644 (file)
--- a/gamma_compression_effect_test.cpp
+++ b/gamma_compression_effect_test.cpp
@@ -3,9 +3,10 @@
 // Pretty much the inverse of the GammaExpansionEffect tests;
 // EffectChainTest tests that they are actually inverses.
 
-#include "test_util.h"
+#include <GL/glew.h>
 #include "gtest/gtest.h"
-#include "gamma_expansion_effect.h"
+#include "image_format.h"
+#include "test_util.h"
 
 TEST(GammaCompressionEffectTest, sRGB_KeyValues) {
        float data[] = {
@@ -66,3 +67,24 @@ TEST(GammaCompressionEffectTest, Rec709_RampAlwaysIncreases) {
                   << "No increase between " << i-1 << " and " << i;
        }
 }
+
+TEST(GammaCompressionEffectTest, Rec2020_12BitIsVeryCloseToRec709) {
+       float data[256];
+       for (unsigned i = 0; i < 256; ++i) {
+               data[i] = i / 255.0f;
+       }
+       float out_data_709[256];
+       float out_data_2020[256];
+
+       EffectChainTester tester(data, 256, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester.run(out_data_709, GL_RED, COLORSPACE_sRGB, GAMMA_REC_709);
+       EffectChainTester tester2(data, 256, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester2.run(out_data_2020, GL_RED, COLORSPACE_sRGB, GAMMA_REC_2020_12_BIT);
+
+       double sqdiff = 0.0;
+       for (unsigned i = 0; i < 256; ++i) {
+               EXPECT_NEAR(out_data_709[i], out_data_2020[i], 1e-3);
+               sqdiff += (out_data_709[i] - out_data_2020[i]) * (out_data_709[i] - out_data_2020[i]);
+       }
+       EXPECT_GT(sqdiff, 1e-6);
+}