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// 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 "lib/jxl/enc_photon_noise.h"
#include "lib/jxl/test_utils.h"
namespace jxl {
namespace {
using ::testing::FloatNear;
using ::testing::Pointwise;
MATCHER(AreApproximatelyEqual, "") {
constexpr float kTolerance = 1e-6;
const float actual = std::get<0>(arg);
const float expected = std::get<1>(arg);
return testing::ExplainMatchResult(FloatNear(expected, kTolerance), actual,
result_listener);
}
TEST(EncPhotonNoiseTest, LUTs) {
EXPECT_THAT(
SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/100).lut,
Pointwise(AreApproximatelyEqual(),
{0.00259652, 0.0139648, 0.00681551, 0.00632582, 0.00694917,
0.00803922, 0.00934574, 0.0107607}));
EXPECT_THAT(
SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/800).lut,
Pointwise(AreApproximatelyEqual(),
{0.02077220, 0.0420923, 0.01820690, 0.01439020, 0.01293670,
0.01254030, 0.01277390, 0.0134161}));
EXPECT_THAT(
SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/6400).lut,
Pointwise(AreApproximatelyEqual(),
{0.1661770, 0.1691120, 0.05309080, 0.03963960, 0.03357410,
0.03001650, 0.02776740, 0.0263478}));
// Lower when measured on a per-pixel basis as there are fewer of them.
EXPECT_THAT(
SimulatePhotonNoise(/*xsize=*/4000, /*ysize=*/3000, /*iso=*/6400).lut,
Pointwise(AreApproximatelyEqual(),
{0.0830886, 0.1008720, 0.0367748, 0.0280305, 0.0240236,
0.0218040, 0.0205771, 0.0200058}));
}
} // namespace
} // namespace jxl
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