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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/quantizer.h"
#include "lib/jxl/base/span.h"
#include "lib/jxl/common.h"
#include "lib/jxl/dec_bit_reader.h"
#include "lib/jxl/enc_fields.h"
#include "lib/jxl/image_ops.h"
#include "lib/jxl/image_test_utils.h"
#include "lib/jxl/testing.h"
namespace jxl {
namespace {
void TestEquivalence(int qxsize, int qysize, const Quantizer& quantizer1,
const Quantizer& quantizer2) {
ASSERT_NEAR(quantizer1.inv_quant_dc(), quantizer2.inv_quant_dc(), 1e-7);
}
TEST(QuantizerTest, QuantizerParams) {
for (uint32_t i = 1; i < 10000; ++i) {
QuantizerParams p;
p.global_scale = i;
size_t extension_bits = 0, total_bits = 0;
EXPECT_TRUE(Bundle::CanEncode(p, &extension_bits, &total_bits));
EXPECT_EQ(0u, extension_bits);
EXPECT_GE(total_bits, 4u);
}
}
TEST(QuantizerTest, BitStreamRoundtripSameQuant) {
const int qxsize = 8;
const int qysize = 8;
DequantMatrices dequant;
Quantizer quantizer1(&dequant);
ImageI raw_quant_field(qxsize, qysize);
quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
BitWriter writer;
QuantizerParams params = quantizer1.GetParams();
EXPECT_TRUE(WriteQuantizerParams(params, &writer, 0, nullptr));
writer.ZeroPadToByte();
const size_t bits_written = writer.BitsWritten();
Quantizer quantizer2(&dequant);
BitReader reader(writer.GetSpan());
EXPECT_TRUE(quantizer2.Decode(&reader));
EXPECT_TRUE(reader.JumpToByteBoundary());
EXPECT_EQ(reader.TotalBitsConsumed(), bits_written);
EXPECT_TRUE(reader.Close());
TestEquivalence(qxsize, qysize, quantizer1, quantizer2);
}
TEST(QuantizerTest, BitStreamRoundtripRandomQuant) {
const int qxsize = 8;
const int qysize = 8;
DequantMatrices dequant;
Quantizer quantizer1(&dequant);
ImageI raw_quant_field(qxsize, qysize);
quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
float quant_dc = 0.17f;
ImageF qf(qxsize, qysize);
RandomFillImage(&qf, 0.0f, 1.0f);
quantizer1.SetQuantField(quant_dc, qf, &raw_quant_field);
BitWriter writer;
QuantizerParams params = quantizer1.GetParams();
EXPECT_TRUE(WriteQuantizerParams(params, &writer, 0, nullptr));
writer.ZeroPadToByte();
const size_t bits_written = writer.BitsWritten();
Quantizer quantizer2(&dequant);
BitReader reader(writer.GetSpan());
EXPECT_TRUE(quantizer2.Decode(&reader));
EXPECT_TRUE(reader.JumpToByteBoundary());
EXPECT_EQ(reader.TotalBitsConsumed(), bits_written);
EXPECT_TRUE(reader.Close());
TestEquivalence(qxsize, qysize, quantizer1, quantizer2);
}
} // namespace
} // namespace jxl
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