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Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/gamma_correct_test.cc')
-rw-r--r-- | third_party/jpeg-xl/lib/jxl/gamma_correct_test.cc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/gamma_correct_test.cc b/third_party/jpeg-xl/lib/jxl/gamma_correct_test.cc new file mode 100644 index 0000000000..131ec4fa83 --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/gamma_correct_test.cc @@ -0,0 +1,37 @@ +// Copyright (c) the JPEG XL Project Authors. All rights reserved. +// +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include <stdlib.h> + +#include <algorithm> + +#include "lib/jxl/enc_gamma_correct.h" +#include "lib/jxl/testing.h" + +namespace jxl { +namespace { + +TEST(GammaCorrectTest, TestLinearToSrgbEdgeCases) { + EXPECT_EQ(0, LinearToSrgb8Direct(0.0)); + EXPECT_NEAR(0, LinearToSrgb8Direct(1E-6f), 2E-5); + EXPECT_EQ(0, LinearToSrgb8Direct(-1E-6f)); + EXPECT_EQ(0, LinearToSrgb8Direct(-1E6)); + EXPECT_NEAR(1, LinearToSrgb8Direct(1 - 1E-6f), 1E-5); + EXPECT_EQ(1, LinearToSrgb8Direct(1 + 1E-6f)); + EXPECT_EQ(1, LinearToSrgb8Direct(1E6)); +} + +TEST(GammaCorrectTest, TestRoundTrip) { + // NOLINTNEXTLINE(clang-analyzer-security.FloatLoopCounter) + for (double linear = 0.0; linear <= 1.0; linear += 1E-7) { + const double srgb = LinearToSrgb8Direct(linear); + const double linear2 = Srgb8ToLinearDirect(srgb); + ASSERT_LT(std::abs(linear - linear2), 2E-13) + << "linear = " << linear << ", linear2 = " << linear2; + } +} + +} // namespace +} // namespace jxl |