94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "lib/jxl/quantizer.h"
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#include <jxl/memory_manager.h>
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#include <cstddef>
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#include <cstdint>
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#include "lib/jxl/base/status.h"
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#include "lib/jxl/dec_bit_reader.h"
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#include "lib/jxl/enc_bit_writer.h"
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#include "lib/jxl/enc_fields.h"
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#include "lib/jxl/fields.h"
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#include "lib/jxl/image.h"
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#include "lib/jxl/image_test_utils.h"
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#include "lib/jxl/quant_weights.h"
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#include "lib/jxl/test_memory_manager.h"
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#include "lib/jxl/testing.h"
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namespace jxl {
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namespace {
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void TestEquivalence(int qxsize, int qysize, const Quantizer& quantizer1,
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const Quantizer& quantizer2) {
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ASSERT_NEAR(quantizer1.inv_quant_dc(), quantizer2.inv_quant_dc(), 1e-7);
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}
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TEST(QuantizerTest, QuantizerParams) {
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for (uint32_t i = 1; i < 10000; ++i) {
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QuantizerParams p;
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p.global_scale = i;
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size_t extension_bits = 0;
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size_t total_bits = 0;
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EXPECT_TRUE(Bundle::CanEncode(p, &extension_bits, &total_bits));
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EXPECT_EQ(0u, extension_bits);
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EXPECT_GE(total_bits, 4u);
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}
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}
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TEST(QuantizerTest, BitStreamRoundtripSameQuant) {
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JxlMemoryManager* memory_manager = jxl::test::MemoryManager();
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const int qxsize = 8;
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const int qysize = 8;
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DequantMatrices dequant;
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Quantizer quantizer1(&dequant);
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JXL_ASSIGN_OR_DIE(ImageI raw_quant_field,
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ImageI::Create(jxl::test::MemoryManager(), qxsize, qysize));
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quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
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BitWriter writer{memory_manager};
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QuantizerParams params = quantizer1.GetParams();
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EXPECT_TRUE(WriteQuantizerParams(params, &writer, 0, nullptr));
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writer.ZeroPadToByte();
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const size_t bits_written = writer.BitsWritten();
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Quantizer quantizer2(&dequant);
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BitReader reader(writer.GetSpan());
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EXPECT_TRUE(quantizer2.Decode(&reader));
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EXPECT_TRUE(reader.JumpToByteBoundary());
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EXPECT_EQ(reader.TotalBitsConsumed(), bits_written);
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EXPECT_TRUE(reader.Close());
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TestEquivalence(qxsize, qysize, quantizer1, quantizer2);
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}
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TEST(QuantizerTest, BitStreamRoundtripRandomQuant) {
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JxlMemoryManager* memory_manager = jxl::test::MemoryManager();
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const int qxsize = 8;
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const int qysize = 8;
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DequantMatrices dequant;
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Quantizer quantizer1(&dequant);
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JXL_ASSIGN_OR_DIE(ImageI raw_quant_field,
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ImageI::Create(memory_manager, qxsize, qysize));
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quantizer1.SetQuant(0.17f, 0.17f, &raw_quant_field);
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float quant_dc = 0.17f;
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JXL_ASSIGN_OR_DIE(ImageF qf, ImageF::Create(memory_manager, qxsize, qysize));
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RandomFillImage(&qf, 0.0f, 1.0f);
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quantizer1.SetQuantField(quant_dc, qf, &raw_quant_field);
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BitWriter writer{memory_manager};
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QuantizerParams params = quantizer1.GetParams();
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EXPECT_TRUE(WriteQuantizerParams(params, &writer, 0, nullptr));
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writer.ZeroPadToByte();
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const size_t bits_written = writer.BitsWritten();
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Quantizer quantizer2(&dequant);
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BitReader reader(writer.GetSpan());
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EXPECT_TRUE(quantizer2.Decode(&reader));
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EXPECT_TRUE(reader.JumpToByteBoundary());
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EXPECT_EQ(reader.TotalBitsConsumed(), bits_written);
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EXPECT_TRUE(reader.Close());
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TestEquivalence(qxsize, qysize, quantizer1, quantizer2);
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}
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} // namespace
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} // namespace jxl
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