Add a test for GammaExpansionEffect. Not done yet.

[movit] / gamma_expansion_effect_test.cpp

diff --git a/gamma_expansion_effect_test.cpp b/gamma_expansion_effect_test.cpp
new file mode 100644 (file)
index 0000000..0fd9a71
--- /dev/null
+++ b/gamma_expansion_effect_test.cpp
@@ -0,0 +1,35 @@
+// Unit tests for GammaExpansionEffect.
+
+#include "test_util.h"
+#include "gtest/gtest.h"
+#include "gamma_expansion_effect.h"
+
+TEST(GammaExpansionEffectTest, sRGB_KeyValues) {
+       float data[] = {
+               0.0f, 1.0f,
+               0.040f, 0.041f,  // On either side of the discontinuity.
+       };
+       float expected_data[] = {
+               0.0f, 1.0f,
+               0.00309f, 0.00317f, 
+       };
+       float out_data[4];
+       EffectChainTester tester(data, 2, 2, COLORSPACE_sRGB, GAMMA_sRGB);
+       tester.run(out_data, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, 2, 2);
+}
+
+TEST(GammaExpansionEffectTest, 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_sRGB);
+       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;
+       }
+}