jpegli.h - mozsearch

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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.

#ifndef LIB_EXTRAS_ENC_JPEGLI_H_

#define LIB_EXTRAS_ENC_JPEGLI_H_

// Encodes JPG pixels and metadata in memory using the libjpegli library.

#include <stdint.h>

#include <string>

#include <vector>

#include "lib/extras/packed_image.h"

#include "lib/jxl/base/data_parallel.h"

#include "lib/jxl/base/status.h"

namespace jxl {

namespace extras {

struct JpegSettings {

  bool xyb = false;

  size_t target_size = 0;

  float quality = 0.0f;

  float distance = 1.f;

  bool use_adaptive_quantization = true;

  bool use_std_quant_tables = false;

  int progressive_level = 2;

  bool optimize_coding = true;

  std::string chroma_subsampling;

  int libjpeg_quality = 0;

  std::string libjpeg_chroma_subsampling;

  // Parameters for selecting distance based on PSNR target.

  float psnr_target = 0.0f;

  float search_tolerance = 0.01;

  float min_distance = 0.1f;

  float max_distance = 25.0f;

  // If not empty, must contain concatenated APP marker segments. In this case,

  // these and only these APP marker segments will be written to the JPEG

  // output. In xyb mode app_data must not contain an ICC profile, in this

  // case an additional APP2 ICC profile for the XYB colorspace will be emitted.

  std::vector<uint8_t> app_data;

};

Status EncodeJpeg(const PackedPixelFile& ppf, const JpegSettings& jpeg_settings,

                  ThreadPool* pool, std::vector<uint8_t>* compressed);

}  // namespace extras

}  // namespace jxl

#endif  // LIB_EXTRAS_ENC_JPEGLI_H_