+ EffectChainTester tester(data, 256, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
+ tester.run(out_data, GL_RED, 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;
+ }
+}
+
+TEST(GammaExpansionEffectTest, sRGB_AlphaIsUnchanged) {
+ float data[] = {
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.25f,
+ 0.0f, 0.0f, 0.0f, 0.5f,
+ 0.0f, 0.0f, 0.0f, 0.75f,
+ 0.0f, 0.0f, 0.0f, 1.0f,
+ };
+ float out_data[5 * 4];
+ EffectChainTester tester(data, 5, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_sRGB);
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(data, out_data, 5, 1);
+}
+
+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, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_REC_709);
+ tester.run(out_data, GL_RED, 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, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_REC_709);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);