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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.
#ifndef LIB_JXL_IMAGE_TEST_UTILS_H_
#define LIB_JXL_IMAGE_TEST_UTILS_H_
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <sstream>
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/random.h"
#include "lib/jxl/base/rect.h"
#include "lib/jxl/image.h"
namespace jxl {
template <typename T>
bool SamePixels(const Plane<T>& image1, const Plane<T>& image2,
std::stringstream& failures) {
const Rect rect(image1);
JXL_CHECK(SameSize(image1, image2));
size_t mismatches = 0;
for (size_t y = rect.y0(); y < rect.ysize(); ++y) {
const T* const JXL_RESTRICT row1 = image1.Row(y);
const T* const JXL_RESTRICT row2 = image2.Row(y);
for (size_t x = rect.x0(); x < rect.xsize(); ++x) {
if (row1[x] != row2[x]) {
failures << "pixel mismatch" << x << ", " << y << ": "
<< static_cast<double>(row1[x])
<< " != " << static_cast<double>(row2[x]) << "\n";
if (++mismatches > 4) {
return false;
}
}
}
}
return mismatches == 0;
}
template <typename T>
bool SamePixels(const Image3<T>& image1, const Image3<T>& image2,
std::stringstream& failures) {
JXL_CHECK(SameSize(image1, image2));
for (size_t c = 0; c < 3; ++c) {
if (!SamePixels(image1.Plane(c), image2.Plane(c), failures)) {
return false;
}
}
return true;
}
// Use for floating-point images with fairly large numbers; tolerates small
// absolute errors and/or small relative errors.
template <typename T>
bool VerifyRelativeError(const Plane<T>& expected, const Plane<T>& actual,
const double threshold_l1,
const double threshold_relative,
std::stringstream& failures, const intptr_t border = 0,
const int c = 0) {
JXL_CHECK(SameSize(expected, actual));
const intptr_t xsize = expected.xsize();
const intptr_t ysize = expected.ysize();
// Max over current scanline to give a better idea whether there are
// systematic errors or just one outlier. Invalid if negative.
double max_l1 = -1;
double max_relative = -1;
bool any_bad = false;
for (intptr_t y = border; y < ysize - border; ++y) {
const T* const JXL_RESTRICT row_expected = expected.Row(y);
const T* const JXL_RESTRICT row_actual = actual.Row(y);
for (intptr_t x = border; x < xsize - border; ++x) {
const double l1 = std::abs(row_expected[x] - row_actual[x]);
// Cannot compute relative, only check/update L1.
if (std::abs(row_expected[x]) < 1E-10) {
if (l1 > threshold_l1) {
any_bad = true;
max_l1 = std::max(max_l1, l1);
}
} else {
const double relative =
l1 / std::abs(static_cast<double>(row_expected[x]));
if (l1 > threshold_l1 && relative > threshold_relative) {
// Fails both tolerances => will exit below, update max_*.
any_bad = true;
max_l1 = std::max(max_l1, l1);
max_relative = std::max(max_relative, relative);
}
}
}
}
if (!any_bad) {
return true;
}
// Never had a valid relative value, don't print it.
if (max_relative < 0) {
fprintf(stderr, "c=%d: max +/- %E exceeds +/- %.2E\n", c, max_l1,
threshold_l1);
} else {
fprintf(stderr, "c=%d: max +/- %E, x %E exceeds +/- %.2E, x %.2E\n", c,
max_l1, max_relative, threshold_l1, threshold_relative);
}
// Dump the expected image and actual image if the region is small enough.
const intptr_t kMaxTestDumpSize = 16;
if (xsize <= kMaxTestDumpSize + 2 * border &&
ysize <= kMaxTestDumpSize + 2 * border) {
fprintf(stderr, "Expected image:\n");
for (intptr_t y = border; y < ysize - border; ++y) {
const T* const JXL_RESTRICT row_expected = expected.Row(y);
for (intptr_t x = border; x < xsize - border; ++x) {
fprintf(stderr, "%10lf ", static_cast<double>(row_expected[x]));
}
fprintf(stderr, "\n");
}
fprintf(stderr, "Actual image:\n");
for (intptr_t y = border; y < ysize - border; ++y) {
const T* const JXL_RESTRICT row_expected = expected.Row(y);
const T* const JXL_RESTRICT row_actual = actual.Row(y);
for (intptr_t x = border; x < xsize - border; ++x) {
const double l1 = std::abs(row_expected[x] - row_actual[x]);
bool bad = l1 > threshold_l1;
if (row_expected[x] > 1E-10) {
const double relative =
l1 / std::abs(static_cast<double>(row_expected[x]));
bad &= relative > threshold_relative;
}
if (bad) {
fprintf(stderr, "%10lf ", static_cast<double>(row_actual[x]));
} else {
fprintf(stderr, "%10s ", "==");
}
}
fprintf(stderr, "\n");
}
}
// Find first failing x for further debugging.
for (intptr_t y = border; y < ysize - border; ++y) {
const T* const JXL_RESTRICT row_expected = expected.Row(y);
const T* const JXL_RESTRICT row_actual = actual.Row(y);
for (intptr_t x = border; x < xsize - border; ++x) {
const double l1 = std::abs(row_expected[x] - row_actual[x]);
bool bad = l1 > threshold_l1;
if (row_expected[x] > 1E-10) {
const double relative =
l1 / std::abs(static_cast<double>(row_expected[x]));
bad &= relative > threshold_relative;
}
if (bad) {
failures << x << ", " << y << " (" << expected.xsize() << " x "
<< expected.ysize() << ") expected "
<< static_cast<double>(row_expected[x]) << " actual "
<< static_cast<double>(row_actual[x]);
return false;
}
}
}
return false;
}
template <typename T>
bool VerifyRelativeError(const Image3<T>& expected, const Image3<T>& actual,
const float threshold_l1,
const float threshold_relative,
std::stringstream& failures,
const intptr_t border = 0) {
for (size_t c = 0; c < 3; ++c) {
bool ok = VerifyRelativeError(expected.Plane(c), actual.Plane(c),
threshold_l1, threshold_relative, failures,
border, static_cast<int>(c));
if (!ok) {
return false;
}
}
return true;
}
template <typename T, typename U = T>
void GenerateImage(Rng& rng, Plane<T>* image, U begin, U end) {
for (size_t y = 0; y < image->ysize(); ++y) {
T* const JXL_RESTRICT row = image->Row(y);
for (size_t x = 0; x < image->xsize(); ++x) {
if (std::is_same<T, float>::value || std::is_same<T, double>::value) {
row[x] = rng.UniformF(begin, end);
} else if (std::is_signed<T>::value) {
row[x] = rng.UniformI(begin, end);
} else {
row[x] = rng.UniformU(begin, end);
}
}
}
}
template <typename T>
void RandomFillImage(Plane<T>* image, const T begin, const T end,
const int seed = 129) {
Rng rng(seed);
GenerateImage(rng, image, begin, end);
}
template <typename T>
typename std::enable_if<std::is_integral<T>::value>::type RandomFillImage(
Plane<T>* image) {
Rng rng(129);
GenerateImage(rng, image, static_cast<int64_t>(0),
static_cast<int64_t>(std::numeric_limits<T>::max()) + 1);
}
JXL_INLINE void RandomFillImage(Plane<float>* image) {
Rng rng(129);
GenerateImage(rng, image, 0.0f, std::numeric_limits<float>::max());
}
template <typename T, typename U>
void GenerateImage(Rng& rng, Image3<T>* image, U begin, U end) {
for (size_t c = 0; c < 3; ++c) {
GenerateImage(rng, &image->Plane(c), begin, end);
}
}
template <typename T>
typename std::enable_if<std::is_integral<T>::value>::type RandomFillImage(
Image3<T>* image) {
Rng rng(129);
GenerateImage(rng, image, static_cast<int64_t>(0),
static_cast<int64_t>(std::numeric_limits<T>::max()) + 1);
}
JXL_INLINE void RandomFillImage(Image3F* image) {
Rng rng(129);
GenerateImage(rng, image, 0.0f, std::numeric_limits<float>::max());
}
template <typename T, typename U>
void RandomFillImage(Image3<T>* image, const U begin, const U end,
const int seed = 129) {
Rng rng(seed);
GenerateImage(rng, image, begin, end);
}
} // namespace jxl
#endif // LIB_JXL_IMAGE_TEST_UTILS_H_