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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/coeff_order.h"
#include <stdio.h>
#include <algorithm>
#include <numeric> // iota
#include <utility>
#include <vector>
#include "lib/jxl/base/printf_macros.h"
#include "lib/jxl/base/random.h"
#include "lib/jxl/base/span.h"
#include "lib/jxl/coeff_order_fwd.h"
#include "lib/jxl/dec_bit_reader.h"
#include "lib/jxl/enc_coeff_order.h"
#include "lib/jxl/testing.h"
namespace jxl {
namespace {
void RoundtripPermutation(coeff_order_t* perm, coeff_order_t* out, size_t len,
size_t* size) {
BitWriter writer;
EncodePermutation(perm, 0, len, &writer, 0, nullptr);
writer.ZeroPadToByte();
Status status = true;
{
BitReader reader(writer.GetSpan());
BitReaderScopedCloser closer(&reader, &status);
ASSERT_TRUE(DecodePermutation(0, len, out, &reader));
}
ASSERT_TRUE(status);
*size = writer.GetSpan().size();
}
enum Permutation { kIdentity, kFewSwaps, kFewSlides, kRandom };
constexpr size_t kSwaps = 32;
void TestPermutation(Permutation kind, size_t len) {
std::vector<coeff_order_t> perm(len);
std::iota(perm.begin(), perm.end(), 0);
Rng rng(0);
if (kind == kFewSwaps) {
for (size_t i = 0; i < kSwaps; i++) {
size_t a = rng.UniformU(0, len - 1);
size_t b = rng.UniformU(0, len - 1);
std::swap(perm[a], perm[b]);
}
}
if (kind == kFewSlides) {
for (size_t i = 0; i < kSwaps; i++) {
size_t a = rng.UniformU(0, len - 1);
size_t b = rng.UniformU(0, len - 1);
size_t from = std::min(a, b);
size_t to = std::max(a, b);
size_t start = perm[from];
for (size_t j = from; j < to; j++) {
perm[j] = perm[j + 1];
}
perm[to] = start;
}
}
if (kind == kRandom) {
rng.Shuffle(perm.data(), perm.size());
}
std::vector<coeff_order_t> out(len);
size_t size = 0;
RoundtripPermutation(perm.data(), out.data(), len, &size);
for (size_t idx = 0; idx < len; idx++) {
EXPECT_EQ(perm[idx], out[idx]);
}
printf("Encoded size: %" PRIuS "\n", size);
}
TEST(CoeffOrderTest, IdentitySmall) { TestPermutation(kIdentity, 256); }
TEST(CoeffOrderTest, FewSlidesSmall) { TestPermutation(kFewSlides, 256); }
TEST(CoeffOrderTest, FewSwapsSmall) { TestPermutation(kFewSwaps, 256); }
TEST(CoeffOrderTest, RandomSmall) { TestPermutation(kRandom, 256); }
TEST(CoeffOrderTest, IdentityMedium) { TestPermutation(kIdentity, 1 << 12); }
TEST(CoeffOrderTest, FewSlidesMedium) { TestPermutation(kFewSlides, 1 << 12); }
TEST(CoeffOrderTest, FewSwapsMedium) { TestPermutation(kFewSwaps, 1 << 12); }
TEST(CoeffOrderTest, RandomMedium) { TestPermutation(kRandom, 1 << 12); }
TEST(CoeffOrderTest, IdentityBig) { TestPermutation(kIdentity, 1 << 16); }
TEST(CoeffOrderTest, FewSlidesBig) { TestPermutation(kFewSlides, 1 << 16); }
TEST(CoeffOrderTest, FewSwapsBig) { TestPermutation(kFewSwaps, 1 << 16); }
TEST(CoeffOrderTest, RandomBig) { TestPermutation(kRandom, 1 << 16); }
} // namespace
} // namespace jxl
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