/src/libjxl/lib/jxl/encode_internal.h

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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_JXL_ENCODE_INTERNAL_H_
#define LIB_JXL_ENCODE_INTERNAL_H_

#include <jxl/cms_interface.h>
#include <jxl/codestream_header.h>
#include <jxl/encode.h>
#include <jxl/memory_manager.h>
#include <jxl/types.h>

#include <algorithm>
#include <array>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "lib/jxl/base/c_callback_support.h"
#include "lib/jxl/base/common.h"
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/enc_fast_lossless.h"
#include "lib/jxl/enc_params.h"
#include "lib/jxl/image_metadata.h"
#include "lib/jxl/jpeg/jpeg_data.h"
#include "lib/jxl/memory_manager_internal.h"
#include "lib/jxl/padded_bytes.h"

namespace jxl {

/* Frame index box 'jxli' will start with Varint() for
NF: has type Varint(): number of frames listed in the index.
TNUM: has type u32: numerator of tick unit.
TDEN: has type u32: denominator of tick unit. Value 0 means the file is
ill-formed. per frame i listed: OFFi: has type Varint(): offset of start byte of
this frame compared to start byte of previous frame from this index in the JPEG
XL codestream. For the first frame, this is the offset from the first byte of
the JPEG XL codestream. Ti: has type Varint(): duration in ticks between the
start of this frame and the start of the next frame in the index. If this is the
last frame in the index, this is the duration in ticks between the start of this
frame and the end of the stream. A tick lasts TNUM / TDEN seconds. Fi: has type
Varint(): amount of frames the next frame in the index occurs after this frame.
If this is the last frame in the index, this is the amount of frames after this
frame in the remainder of the stream. Only frames that are presented by the
decoder are counted for this purpose, this excludes frames that are not intended
for display but for compositing with other frames, such as frames that aren't
the last frame with a duration of 0 ticks.

All the frames listed in jxli are keyframes and the first frame is
present in the list.
There shall be either zero or one Frame Index boxes in a JPEG XL file.
The offsets OFFi per frame are given as bytes in the codestream, not as
bytes in the file format using the box structure. This means if JPEG XL Partial
Codestream boxes are used, the offset is counted within the concatenated
codestream, bytes from box headers or non-codestream boxes are not counted.
*/

struct JxlEncoderFrameIndexBoxEntry {
  bool to_be_indexed;
  uint32_t duration;
  uint64_t OFFi;
};

struct JxlEncoderFrameIndexBox {
  // We always need to record the first frame entry, so presence of the
  // first entry alone is not an indication if it was requested to be
  // stored.
  bool index_box_requested_through_api = false;

  int64_t NF() const { return entries.size(); }
  bool StoreFrameIndexBox() {
    for (auto e : entries) {
      if (e.to_be_indexed) {
        return true;
      }
    }
    return false;
  }
  int32_t TNUM = 1;
  int32_t TDEN = 1000;

  std::vector<JxlEncoderFrameIndexBoxEntry> entries;

  // That way we can ensure that every index box will have the first frame.
  // If the API user decides to mark it as an indexed frame, we call
  // the AddFrame again, this time with requested.
  void AddFrame(uint64_t OFFi, uint32_t duration, bool to_be_indexed) {
    // We call AddFrame to every frame.
    // Recording the first frame is required by the standard.
    // Knowing the last frame is required, since the last indexed frame
    // needs to know how many frames until the end.
    // To be able to tell how many frames there are between each index
    // entry we just record every frame here.
    if (entries.size() == 1) {
      if (OFFi == entries[0].OFFi) {
        // API use for the first frame, let's clear the already recorded first
        // frame.
        entries.clear();
      }
    }
    JxlEncoderFrameIndexBoxEntry e;
    e.to_be_indexed = to_be_indexed;
    e.OFFi = OFFi;
    e.duration = duration;
    entries.push_back(e);
  }
};

// The encoder options (such as quality, compression speed, ...) for a single
// frame, but not encoder-wide options such as box-related options.
struct JxlEncoderFrameSettingsValues {
  // lossless is a separate setting from cparams because it is a combination
  // setting that overrides multiple settings inside of cparams.
  bool lossless;
  CompressParams cparams;
  JxlFrameHeader header;
  std::vector<JxlBlendInfo> extra_channel_blend_info;
  std::string frame_name;
  JxlBitDepth image_bit_depth;
  bool frame_index_box = false;
  jxl::AuxOut* aux_out = nullptr;
};

using BoxType = std::array<uint8_t, 4>;

// Utility function that makes a BoxType from a string literal. The string must
// have 4 characters, a 5th null termination character is optional.
constexpr BoxType MakeBoxType(const char* type) {
  return BoxType(
      {{static_cast<uint8_t>(type[0]), static_cast<uint8_t>(type[1]),
        static_cast<uint8_t>(type[2]), static_cast<uint8_t>(type[3])}});
}

constexpr std::array<unsigned char, 32> kContainerHeader = {
    0,   0,   0, 0xc, 'J',  'X', 'L', ' ', 0xd, 0xa, 0x87,
    0xa, 0,   0, 0,   0x14, 'f', 't', 'y', 'p', 'j', 'x',
    'l', ' ', 0, 0,   0,    0,   'j', 'x', 'l', ' '};

constexpr std::array<unsigned char, 8> kLevelBoxHeader = {0,   0,   0,   0x9,
                                                          'j', 'x', 'l', 'l'};

static JXL_INLINE size_t BitsPerChannel(JxlDataType data_type) {
  switch (data_type) {
    case JXL_TYPE_UINT8:
      return 8;
    case JXL_TYPE_UINT16:
      return 16;
    case JXL_TYPE_FLOAT:
      return 32;
    case JXL_TYPE_FLOAT16:
      return 16;
    default:
      return 0;  // signals unhandled JxlDataType
  }
}

static JXL_INLINE size_t BytesPerPixel(JxlPixelFormat format) {
  return format.num_channels * BitsPerChannel(format.data_type) / 8;
}

using ScopedInputBuffer =
    std::unique_ptr<const void, std::function<void(const void*)>>;

static JXL_INLINE ScopedInputBuffer
GetColorBuffer(JxlChunkedFrameInputSource& input, size_t xpos, size_t ypos,
               size_t xsize, size_t ysize, size_t* row_offset) {
  return ScopedInputBuffer(
      input.get_color_channel_data_at(input.opaque, xpos, ypos, xsize, ysize,
                                      row_offset),
      [&input](const void* p) { input.release_buffer(input.opaque, p); });
}

static JXL_INLINE ScopedInputBuffer GetExtraChannelBuffer(
    JxlChunkedFrameInputSource& input, size_t ec_index, size_t xpos,
    size_t ypos, size_t xsize, size_t ysize, size_t* row_offset) {
  return ScopedInputBuffer(
      input.get_extra_channel_data_at(input.opaque, ec_index, xpos, ypos, xsize,
                                      ysize, row_offset),
      [&input](const void* p) { input.release_buffer(input.opaque, p); });
}

// Common adapter for an existing frame input source or a whole-image input
// buffer or a parsed JPEG file.
class JxlEncoderChunkedFrameAdapter {
 public:
  JxlEncoderChunkedFrameAdapter(size_t xs, size_t ys, size_t num_extra_channels)
      : xsize(xs), ysize(ys), channels_(1 + num_extra_channels) {}

  void SetInputSource(JxlChunkedFrameInputSource input_source) {
    input_source_ = input_source;
    has_input_source_ = true;
  }

  bool SetFromBuffer(size_t channel, const uint8_t* buffer, size_t size,
                     JxlPixelFormat format) {
    if (channel >= channels_.size()) return false;
    if (!channels_[channel].SetFromBuffer(buffer, size, format, xsize, ysize)) {
      return false;
    }
    if (channel > 0) channels_[channel].CopyBuffer();
    return true;
  }

  void SetJPEGData(std::unique_ptr<jpeg::JPEGData> jpeg_data) {
    jpeg_data_ = std::move(jpeg_data);
  }

  // NB: after TakeJPEGData it will return false!
  bool IsJPEG() const { return jpeg_data_ != nullptr; }

  std::unique_ptr<jpeg::JPEGData> TakeJPEGData() {
    return std::move(jpeg_data_);
  }

  JxlChunkedFrameInputSource GetInputSource() {
    if (has_input_source_) {
      return input_source_;
    }
    return JxlChunkedFrameInputSource{
        this,
        METHOD_TO_C_CALLBACK(
            &JxlEncoderChunkedFrameAdapter::GetColorChannelsPixelFormat),
        METHOD_TO_C_CALLBACK(
            &JxlEncoderChunkedFrameAdapter::GetColorChannelDataAt),
        METHOD_TO_C_CALLBACK(
            &JxlEncoderChunkedFrameAdapter::GetExtraChannelPixelFormat),
        METHOD_TO_C_CALLBACK(
            &JxlEncoderChunkedFrameAdapter::GetExtraChannelDataAt),
        METHOD_TO_C_CALLBACK(
            &JxlEncoderChunkedFrameAdapter::ReleaseCurrentData)};
  }

  bool CopyBuffers() {
    if (has_input_source_) {
      JxlPixelFormat format{4, JXL_TYPE_UINT8, JXL_NATIVE_ENDIAN, 0};
      input_source_.get_color_channels_pixel_format(input_source_.opaque,
                                                    &format);
      size_t row_offset;
      {
        auto buffer =
            GetColorBuffer(input_source_, 0, 0, xsize, ysize, &row_offset);
        if (!buffer) return false;
        channels_[0].CopyFromBuffer(buffer.get(), format, xsize, ysize,
                                    row_offset);
      }
      for (size_t ec = 0; ec + 1 < channels_.size(); ++ec) {
        input_source_.get_extra_channel_pixel_format(input_source_.opaque, ec,
                                                     &format);
        auto buffer = GetExtraChannelBuffer(input_source_, ec, 0, 0, xsize,
                                            ysize, &row_offset);
        if (!buffer) continue;
        channels_[1 + ec].CopyFromBuffer(buffer.get(), format, xsize, ysize,
                                         row_offset);
      }
      has_input_source_ = false;
    } else {
      channels_[0].CopyBuffer();
    }
    return true;
  }

  bool StreamingInput() const { return has_input_source_; }

  const size_t xsize;
  const size_t ysize;

 private:
  void GetColorChannelsPixelFormat(JxlPixelFormat* pixel_format) {
    *pixel_format = channels_[0].format_;
  }

  const void* GetColorChannelDataAt(size_t xpos, size_t ypos, size_t x_size,
                                    size_t y_size, size_t* row_offset) {
    return channels_[0].GetDataAt(xpos, ypos, x_size, y_size, row_offset);
  }

  void GetExtraChannelPixelFormat(size_t ec_index,
                                  JxlPixelFormat* pixel_format) {
    JXL_DASSERT(1 + ec_index < channels_.size());
    *pixel_format = channels_[1 + ec_index].format_;
  }

  const void* GetExtraChannelDataAt(size_t ec_index, size_t xpos, size_t ypos,
                                    size_t x_size, size_t y_size,
                                    size_t* row_offset) {
    JXL_DASSERT(1 + ec_index < channels_.size());
    return channels_[1 + ec_index].GetDataAt(xpos, ypos, x_size, y_size,
                                             row_offset);
  }

  void ReleaseCurrentData(const void* buffer) {
    // No dynamic memory is allocated in GetColorChannelDataAt or
    // GetExtraChannelDataAt. Therefore, no cleanup is required here.
  }

  JxlChunkedFrameInputSource input_source_ = {};
  bool has_input_source_ = false;
  std::unique_ptr<jpeg::JPEGData> jpeg_data_;
  struct Channel {
    const uint8_t* buffer_ = nullptr;
    size_t buffer_size_;
    JxlPixelFormat format_;
    size_t xsize_;
    size_t ysize_;
    size_t bytes_per_pixel_;
    size_t stride_;
    std::vector<uint8_t> copy_;

    void SetFormatAndDimensions(JxlPixelFormat format, size_t x_size,
                                size_t y_size) {
      format_ = format;
      xsize_ = x_size;
      ysize_ = y_size;
      bytes_per_pixel_ = BytesPerPixel(format_);
      const size_t last_row_size = xsize_ * bytes_per_pixel_;
      const size_t align = format_.align;
      stride_ = (align > 1 ? jxl::DivCeil(last_row_size, align) * align
                           : last_row_size);
    }

    bool SetFromBuffer(const uint8_t* buffer, size_t size,
                       JxlPixelFormat format, size_t x_size, size_t y_size) {
      SetFormatAndDimensions(format, x_size, y_size);
      buffer_ = buffer;
      buffer_size_ = size;
      const size_t min_buffer_size =
          stride_ * (ysize_ - 1) + xsize_ * bytes_per_pixel_;
      return min_buffer_size <= size;
    }

    void CopyFromBuffer(const void* buffer, JxlPixelFormat format,
                        size_t x_size, size_t y_size, size_t row_offset) {
      SetFormatAndDimensions(format, x_size, y_size);
      buffer_ = nullptr;
      copy_.resize(y_size * stride_);
      for (size_t y = 0; y < y_size; ++y) {
        memcpy(copy_.data() + y * stride_,
               reinterpret_cast<const uint8_t*>(buffer) + y * row_offset,
               stride_);
      }
    }

    void CopyBuffer() {
      if (buffer_) {
        copy_ = std::vector<uint8_t>(buffer_, buffer_ + buffer_size_);
        buffer_ = nullptr;
      }
    }

    const void* GetDataAt(size_t xpos, size_t ypos, size_t x_size,
                          size_t y_size, size_t* row_offset) const {
      const uint8_t* buffer = copy_.empty() ? buffer_ : copy_.data();
      JXL_DASSERT(ypos + y_size <= ysize_);
      JXL_DASSERT(xpos + x_size <= xsize_);
      JXL_DASSERT(buffer);
      *row_offset = stride_;
      return buffer + ypos * stride_ + xpos * bytes_per_pixel_;
    }
  };
  std::vector<Channel> channels_;
};

struct JxlEncoderQueuedFrame {
  JxlEncoderFrameSettingsValues option_values;
  JxlEncoderChunkedFrameAdapter frame_data;
  std::vector<uint8_t> ec_initialized;
};

struct JxlEncoderQueuedBox {
  BoxType type;
  std::vector<uint8_t> contents;
  bool compress_box;
};

using FJXLFrameUniquePtr =
    std::unique_ptr<JxlFastLosslessFrameState,
                    decltype(&JxlFastLosslessFreeFrameState)>;

// Either a frame, or a box, not both.
// Can also be a FJXL frame.
struct JxlEncoderQueuedInput {
  explicit JxlEncoderQueuedInput(const JxlMemoryManager& memory_manager)
      : frame(nullptr, jxl::MemoryManagerDeleteHelper(&memory_manager)),
        box(nullptr, jxl::MemoryManagerDeleteHelper(&memory_manager)) {}
  MemoryManagerUniquePtr<JxlEncoderQueuedFrame> frame;
  MemoryManagerUniquePtr<JxlEncoderQueuedBox> box;
  FJXLFrameUniquePtr fast_lossless_frame = {nullptr,
                                            JxlFastLosslessFreeFrameState};
};

static constexpr size_t kSmallBoxHeaderSize = 8;
static constexpr size_t kLargeBoxHeaderSize = 16;
static constexpr size_t kLargeBoxContentSizeThreshold =
    0x100000000ull - kSmallBoxHeaderSize;

size_t WriteBoxHeader(const jxl::BoxType& type, size_t size, bool unbounded,
                      bool force_large_box, uint8_t* output);

// Appends a JXL container box header with given type, size, and unbounded
// properties to output.
template <typename T>
void AppendBoxHeader(const jxl::BoxType& type, size_t size, bool unbounded,
                     T* output) {
  size_t current_size = output->size();
  output->resize(current_size + kLargeBoxHeaderSize);
  size_t header_size =
      WriteBoxHeader(type, size, unbounded, /*force_large_box=*/false,
                     output->data() + current_size);
  output->resize(current_size + header_size);
}

}  // namespace jxl

class JxlOutputProcessorBuffer;

class JxlEncoderOutputProcessorWrapper {
  friend class JxlOutputProcessorBuffer;

 public:
  explicit JxlEncoderOutputProcessorWrapper(JxlMemoryManager* memory_manager)
      : memory_manager_(memory_manager) {}
  JxlEncoderOutputProcessorWrapper(JxlMemoryManager* memory_manager,
                                   JxlEncoderOutputProcessor processor)
      : memory_manager_(memory_manager),
        external_output_processor_(
            jxl::make_unique<JxlEncoderOutputProcessor>(processor)) {}

  bool HasAvailOut() const { return avail_out_ != nullptr; }

  // Caller can never overwrite a previously-written buffer. Asking for a buffer
  // with `min_size` such that `position + min_size` overlaps with a
  // previously-written buffer is invalid.
  jxl::StatusOr<JxlOutputProcessorBuffer> GetBuffer(size_t min_size,
                                                    size_t requested_size = 0);

  jxl::Status Seek(size_t pos);

  jxl::Status SetFinalizedPosition();

  size_t CurrentPosition() const { return position_; }

  jxl::Status SetAvailOut(uint8_t** next_out, size_t* avail_out);

  bool WasStopRequested() const { return stop_requested_; }
  bool OutputProcessorSet() const {
    return external_output_processor_ != nullptr;
  }
  bool HasOutputToWrite() const {
    return output_position_ < finalized_position_;
  }

  // TODO(eustas): consider extra copy elimination
  jxl::Status CopyOutput(std::vector<uint8_t>& output);

 private:
  jxl::Status ReleaseBuffer(size_t bytes_used);

  // Tries to write all the bytes up to the finalized position.
  jxl::Status FlushOutput(uint8_t** next_out, size_t* avail_out);

  bool AppendBufferToExternalProcessor(void* data, size_t count);

  struct InternalBuffer {
    explicit InternalBuffer(JxlMemoryManager* memory_manager)
        : owned_data(memory_manager) {
      JXL_DASSERT(memory_manager != nullptr);
    }
    // Bytes in the range `[output_position_ - start_of_the_buffer,
    // written_bytes)` need to be flushed out.
    size_t written_bytes = 0;
    // If data has been buffered, it is stored in `owned_data`.
    jxl::PaddedBytes owned_data;
  };

  // Invariant: `internal_buffers_` does not contain chunks that are entirely
  // below the output position.
  std::map<size_t, InternalBuffer> internal_buffers_;

  uint8_t** next_out_ = nullptr;
  size_t* avail_out_ = nullptr;
  // Where the next GetBuffer call will write bytes to.
  size_t position_ = 0;
  // The position of the last SetFinalizedPosition call.
  size_t finalized_position_ = 0;
  // Either the position of the `external_output_processor_` or the position
  // `next_out_` points to.
  size_t output_position_ = 0;

  bool stop_requested_ = false;
  bool has_buffer_ = false;

  JxlMemoryManager* memory_manager_;
  std::unique_ptr<JxlEncoderOutputProcessor> external_output_processor_;
};

class JxlOutputProcessorBuffer {
 public:
  size_t size() const { return size_; };
  uint8_t* data() { return data_; }

  JxlOutputProcessorBuffer(uint8_t* buffer, size_t size, size_t bytes_used,
                           JxlEncoderOutputProcessorWrapper* wrapper)
      : data_(buffer),
        size_(size),
        bytes_used_(bytes_used),
        wrapper_(wrapper) {}
  ~JxlOutputProcessorBuffer() {
    jxl::Status result = release();
    (void)result;
    JXL_DASSERT(result);
  }

  JxlOutputProcessorBuffer(const JxlOutputProcessorBuffer&) = delete;
  JxlOutputProcessorBuffer(JxlOutputProcessorBuffer&& other) noexcept
      : JxlOutputProcessorBuffer(other.data_, other.size_, other.bytes_used_,
                                 other.wrapper_) {
    other.data_ = nullptr;
    other.size_ = 0;
  }

  jxl::Status advance(size_t count) {
    JXL_ENSURE(count <= size_);
    data_ += count;
    size_ -= count;
    bytes_used_ += count;
    return true;
  }

  jxl::Status release() {
    jxl::Status result = jxl::OkStatus();
    if (this->data_) {
      result = wrapper_->ReleaseBuffer(bytes_used_);
    }
    data_ = nullptr;
    size_ = 0;
    return result;
  }

  jxl::Status append(const void* data, size_t count) {
    memcpy(data_, data, count);
    JXL_RETURN_IF_ERROR(advance(count));
    return true;
  }

  template <typename T>
  jxl::Status append(const T& data) {
    static_assert(sizeof(*std::begin(data)) == 1, "Cannot append non-bytes");
    JXL_RETURN_IF_ERROR(
        append(&*std::begin(data), std::end(data) - std::begin(data)));
    return true;
  }

  JxlOutputProcessorBuffer& operator=(const JxlOutputProcessorBuffer&) = delete;
  JxlOutputProcessorBuffer& operator=(
      JxlOutputProcessorBuffer&& other) noexcept {
    data_ = other.data_;
    size_ = other.size_;
    wrapper_ = other.wrapper_;
    return *this;
  }

 private:
  uint8_t* data_;
  size_t size_;
  size_t bytes_used_;
  JxlEncoderOutputProcessorWrapper* wrapper_;
};

template <typename T>
jxl::Status AppendData(JxlEncoderOutputProcessorWrapper& output_processor,
                       const T& data) {
  size_t size = std::end(data) - std::begin(data);
  size_t written = 0;
  while (written < size) {
    JXL_ASSIGN_OR_RETURN(auto buffer,
                         output_processor.GetBuffer(1, size - written));
    size_t n = std::min(size - written, buffer.size());
    JXL_RETURN_IF_ERROR(buffer.append(data.data() + written, n));
    written += n;
  }
  return jxl::OkStatus();
}

// Internal use only struct, can only be initialized correctly by
// JxlEncoderCreate.
struct JxlEncoder {
  JxlEncoder() : output_processor(&memory_manager) {}
  JxlMemoryManager memory_manager;
  jxl::MemoryManagerUniquePtr<jxl::ThreadPool> thread_pool{
      nullptr, jxl::MemoryManagerDeleteHelper(&memory_manager)};
  std::vector<jxl::MemoryManagerUniquePtr<JxlEncoderFrameSettings>>
      encoder_options;

  size_t num_queued_frames;
  size_t num_queued_boxes;
  std::vector<jxl::JxlEncoderQueuedInput> input_queue;
  JxlEncoderOutputProcessorWrapper output_processor;

  // How many codestream bytes have been written, i.e.,
  // content of jxlc and jxlp boxes. Frame index box jxli
  // requires position indices to point to codestream bytes,
  // so we need to keep track of the total of flushed or queue
  // codestream bytes. These bytes may be in a single jxlc box
  // or across multiple jxlp boxes.
  size_t codestream_bytes_written_end_of_frame;
  jxl::JxlEncoderFrameIndexBox frame_index_box;

  JxlCmsInterface cms;
  bool cms_set;

  // Force using the container even if not needed
  bool use_container;
  // User declared they will add metadata boxes
  bool use_boxes;

  // TODO(lode): move level into jxl::CompressParams since some C++
  // implementation decisions should be based on it: level 10 allows more
  // features to be used.
  bool store_jpeg_metadata;
  int32_t codestream_level;
  jxl::CodecMetadata metadata;
  std::vector<uint8_t> jpeg_metadata;

  jxl::CompressParams last_used_cparams;
  JxlBasicInfo basic_info;

  JxlEncoderError error = JxlEncoderError::JXL_ENC_ERR_OK;

  // Encoder wrote a jxlp (partial codestream) box, so any next codestream
  // parts must also be written in jxlp boxes, a single jxlc box cannot be
  // used. The counter is used for the 4-byte jxlp box index header.
  size_t jxlp_counter;

  // Wrote any output at all, so wrote the data before the first user added
  // frame or box, such as signature, basic info, ICC profile or jpeg
  // reconstruction box.
  bool wrote_bytes;

  bool frames_closed;
  bool boxes_closed;
  bool basic_info_set;
  bool color_encoding_set;
  bool intensity_target_set;
  bool allow_expert_options = false;
  int brotli_effort = -1;

  // Takes the first frame in the input_queue, encodes it, and appends
  // the bytes to the output_byte_queue.
  jxl::Status ProcessOneEnqueuedInput();

  bool MustUseContainer() const {
    return use_container || (codestream_level != 5 && codestream_level != -1) ||
           store_jpeg_metadata || use_boxes;
  }

  // `write_box` must never seek before the position the output wrapper was at
  // the moment of the call, and must leave the output wrapper such that its
  // position is one byte past the end of the written box.
  template <typename WriteBox>
  jxl::Status AppendBox(const jxl::BoxType& type, bool unbounded,
                        size_t box_max_size, const WriteBox& write_box);

  template <typename BoxContents>
  jxl::Status AppendBoxWithContents(const jxl::BoxType& type,
                                    const BoxContents& contents);
};

struct JxlEncoderFrameSettings {
  JxlEncoder* enc;
  jxl::JxlEncoderFrameSettingsValues values;
};

struct JxlEncoderStats {
  std::unique_ptr<jxl::AuxOut> aux_out;
};

#endif  // LIB_JXL_ENCODE_INTERNAL_H_

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Created: 2025-06-16 07:00