jpeg_ls_codec.h

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// BSD 3-Clause License
// Copyright (c) 2021-2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#ifndef PACS_ENCODING_COMPRESSION_JPEG_LS_CODEC_HPP
#define PACS_ENCODING_COMPRESSION_JPEG_LS_CODEC_HPP
 
#include "kcenon/pacs/encoding/compression/compression_codec.h"
 
namespace kcenon::pacs::encoding::compression {
 
class jpeg_ls_codec final : public compression_codec {
public:
    static constexpr std::string_view kTransferSyntaxUIDLossless =
        "1.2.840.10008.1.2.4.80";
 
    static constexpr std::string_view kTransferSyntaxUIDNearLossless =
        "1.2.840.10008.1.2.4.81";
 
    static constexpr int kAutoNearValue = -1;
 
    static constexpr int kLosslessNearValue = 0;
 
    static constexpr int kDefaultNearLosslessValue = 2;
 
    static constexpr int kMaxNearValue = 255;
 
    explicit jpeg_ls_codec(bool lossless = true, int near_value = kAutoNearValue);
 
    ~jpeg_ls_codec() override;
 
    // Non-copyable but movable (internal state)
    jpeg_ls_codec(const jpeg_ls_codec&) = delete;
    jpeg_ls_codec& operator=(const jpeg_ls_codec&) = delete;
    jpeg_ls_codec(jpeg_ls_codec&&) noexcept;
    jpeg_ls_codec& operator=(jpeg_ls_codec&&) noexcept;
 
 
    [[nodiscard]] std::string_view transfer_syntax_uid() const noexcept override;
    [[nodiscard]] std::string_view name() const noexcept override;
    [[nodiscard]] bool is_lossy() const noexcept override;
    [[nodiscard]] bool can_encode(const image_params& params) const noexcept override;
    [[nodiscard]] bool can_decode(const image_params& params) const noexcept override;
 
 
 
    [[nodiscard]] bool is_lossless_mode() const noexcept;
 
    [[nodiscard]] int near_value() const noexcept;
 
 
 
    [[nodiscard]] codec_result encode(
        std::span<const uint8_t> pixel_data,
        const image_params& params,
        const compression_options& options = {}) const override;
 
    [[nodiscard]] codec_result decode(
        std::span<const uint8_t> compressed_data,
        const image_params& params) const override;
 
 
private:
    class impl;
    std::unique_ptr<impl> impl_;
};
 
}  // namespace kcenon::pacs::encoding::compression
 
#endif  // PACS_ENCODING_COMPRESSION_JPEG_LS_CODEC_HPP