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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 <vector>
#include "lib/jpegli/decode.h"
#include "lib/jpegli/encode.h"
#include "lib/jpegli/test_utils.h"
#include "lib/jpegli/testing.h"
#include "lib/jxl/base/status.h"
namespace jpegli {
namespace {
void TranscodeWithJpegli(const std::vector<uint8_t>& jpeg_input,
const CompressParams& jparams,
std::vector<uint8_t>* jpeg_output) {
jpeg_decompress_struct dinfo = {};
jpeg_compress_struct cinfo = {};
uint8_t* transcoded_data = nullptr;
unsigned long transcoded_size;
const auto try_catch_block = [&]() -> bool {
ERROR_HANDLER_SETUP(jpegli);
dinfo.err = cinfo.err;
dinfo.client_data = cinfo.client_data;
jpegli_create_decompress(&dinfo);
jpegli_mem_src(&dinfo, jpeg_input.data(), jpeg_input.size());
EXPECT_EQ(JPEG_REACHED_SOS,
jpegli_read_header(&dinfo, /*require_image=*/TRUE));
jvirt_barray_ptr* coef_arrays = jpegli_read_coefficients(&dinfo);
JXL_CHECK(coef_arrays != nullptr);
jpegli_create_compress(&cinfo);
jpegli_mem_dest(&cinfo, &transcoded_data, &transcoded_size);
jpegli_copy_critical_parameters(&dinfo, &cinfo);
jpegli_set_progressive_level(&cinfo, jparams.progressive_mode);
cinfo.optimize_coding = jparams.optimize_coding;
jpegli_write_coefficients(&cinfo, coef_arrays);
jpegli_finish_compress(&cinfo);
jpegli_finish_decompress(&dinfo);
return true;
};
ASSERT_TRUE(try_catch_block());
jpegli_destroy_decompress(&dinfo);
jpegli_destroy_compress(&cinfo);
if (transcoded_data) {
jpeg_output->assign(transcoded_data, transcoded_data + transcoded_size);
free(transcoded_data);
}
}
struct TestConfig {
TestImage input;
CompressParams jparams;
};
class TranscodeAPITestParam : public ::testing::TestWithParam<TestConfig> {};
TEST_P(TranscodeAPITestParam, TestAPI) {
TestConfig config = GetParam();
CompressParams& jparams = config.jparams;
GeneratePixels(&config.input);
// Start with sequential non-optimized jpeg.
jparams.progressive_mode = 0;
jparams.optimize_coding = 0;
std::vector<uint8_t> compressed;
ASSERT_TRUE(EncodeWithJpegli(config.input, jparams, &compressed));
TestImage output0;
DecodeWithLibjpeg(jparams, DecompressParams(), compressed, &output0);
// Transcode first to a sequential optimized jpeg, and then further to
// a progressive jpeg.
for (int progr : {0, 2}) {
std::vector<uint8_t> transcoded;
jparams.progressive_mode = progr;
jparams.optimize_coding = 1;
TranscodeWithJpegli(compressed, jparams, &transcoded);
// We expect a size reduction of at least 2%.
EXPECT_LT(transcoded.size(), compressed.size() * 0.98f);
// Verify that transcoding is lossless.
TestImage output1;
DecodeWithLibjpeg(jparams, DecompressParams(), transcoded, &output1);
ASSERT_EQ(output0.pixels.size(), output1.pixels.size());
EXPECT_EQ(0, memcmp(output0.pixels.data(), output1.pixels.data(),
output0.pixels.size()));
compressed = transcoded;
}
}
std::vector<TestConfig> GenerateTests() {
std::vector<TestConfig> all_tests;
const size_t xsize0 = 1024;
const size_t ysize0 = 768;
for (int dxsize : {0, 1, 8, 9}) {
for (int dysize : {0, 1, 8, 9}) {
for (int h_sampling : {1, 2}) {
for (int v_sampling : {1, 2}) {
TestConfig config;
config.input.xsize = xsize0 + dxsize;
config.input.ysize = ysize0 + dysize;
config.jparams.h_sampling = {h_sampling, 1, 1};
config.jparams.v_sampling = {v_sampling, 1, 1};
all_tests.push_back(config);
}
}
}
}
return all_tests;
}
std::ostream& operator<<(std::ostream& os, const TestConfig& c) {
os << c.input;
os << c.jparams;
return os;
}
std::string TestDescription(
const testing::TestParamInfo<TranscodeAPITestParam::ParamType>& info) {
std::stringstream name;
name << info.param;
return name.str();
}
JPEGLI_INSTANTIATE_TEST_SUITE_P(TranscodeAPITest, TranscodeAPITestParam,
testing::ValuesIn(GenerateTests()),
TestDescription);
} // namespace
} // namespace jpegli
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