Source code
Revision control
Copy as Markdown
Other Tools
// 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 <jxl/memory_manager.h>
#include <cstddef>
#include <cstdint>
#include "lib/jxl/dec_bit_reader.h"
#include "lib/jxl/enc_aux_out.h"
#include "lib/jxl/enc_bit_writer.h"
#include "lib/jxl/enc_fields.h"
#include "lib/jxl/fields.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_test_utils.h"
#include "lib/jxl/quant_weights.h"
#include "lib/jxl/test_memory_manager.h"
#include "lib/jxl/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;
size_t 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) {
JxlMemoryManager* memory_manager = jxl::test::MemoryManager();
const int qxsize = 8;
const int qysize = 8;
DequantMatrices dequant;
Quantizer quantizer1(dequant);
JXL_TEST_ASSIGN_OR_DIE(
ImageI raw_quant_field,
ImageI::Create(jxl::test::MemoryManager(), qxsize, qysize));
quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
BitWriter writer{memory_manager};
QuantizerParams params = quantizer1.GetParams();
EXPECT_TRUE(
WriteQuantizerParams(params, &writer, LayerType::Header, 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) {
JxlMemoryManager* memory_manager = jxl::test::MemoryManager();
const int qxsize = 8;
const int qysize = 8;
DequantMatrices dequant;
Quantizer quantizer1(dequant);
JXL_TEST_ASSIGN_OR_DIE(ImageI raw_quant_field,
ImageI::Create(memory_manager, qxsize, qysize));
quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
float quant_dc = 0.17f;
JXL_TEST_ASSIGN_OR_DIE(ImageF qf,
ImageF::Create(memory_manager, qxsize, qysize));
RandomFillImage(&qf, 0.0f, 1.0f);
ASSERT_TRUE(quantizer1.SetQuantField(quant_dc, qf, &raw_quant_field));
BitWriter writer{memory_manager};
QuantizerParams params = quantizer1.GetParams();
EXPECT_TRUE(
WriteQuantizerParams(params, &writer, LayerType::Header, 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