gimp/plug-ins/common/file-jpegxl.c

/* GIMP - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * file-jpegxl - JPEG XL file format plug-in for the GIMP
 * Copyright (C) 2021  Daniel Novomesky
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <gexiv2/gexiv2.h>
#include <glib/gstdio.h>

#include <jxl/decode.h>
#include <jxl/encode.h>
#include <jxl/thread_parallel_runner.h>

#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>

#include "libgimp/stdplugins-intl.h"

#define LOAD_PROC       "file-jpegxl-load"
#define EXPORT_PROC     "file-jpegxl-export"
#define PLUG_IN_BINARY  "file-jpegxl"

typedef struct _JpegXL      JpegXL;
typedef struct _JpegXLClass JpegXLClass;

struct _JpegXL
{
  GimpPlugIn      parent_instance;
};

struct _JpegXLClass
{
  GimpPlugInClass parent_class;
};


#define JPEGXL_TYPE  (jpegxl_get_type ())
#define JPEGXL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), JPEGXL_TYPE, JpegXL))

GType                   jpegxl_get_type (void) G_GNUC_CONST;

static GList           *jpegxl_query_procedures (GimpPlugIn            *plug_in);
static GimpProcedure   *jpegxl_create_procedure (GimpPlugIn            *plug_in,
                                                 const gchar           *name);

static GimpValueArray *jpegxl_load              (GimpProcedure         *procedure,
                                                 GimpRunMode            run_mode,
                                                 GFile                 *file,
                                                 GimpMetadata          *metadata,
                                                 GimpMetadataLoadFlags *flags,
                                                 GimpProcedureConfig   *config,
                                                 gpointer               run_data);
static GimpValueArray *jpegxl_export            (GimpProcedure         *procedure,
                                                 GimpRunMode            run_mode,
                                                 GimpImage             *image,
                                                 GFile                 *file,
                                                 GimpExportOptions     *options,
                                                 GimpMetadata          *metadata,
                                                 GimpProcedureConfig   *config,
                                                 gpointer               run_data);

static void      create_cmyk_layer              (GimpImage             *image,
                                                 GimpLayer             *layer,
                                                 const gchar           *type_format,
                                                 const Babl            *space,
                                                 gpointer               picture_buffer,
                                                 gpointer               key_buffer,
                                                 gint                   bit_depth,
                                                 gboolean               has_alpha);
static void      extract_cmyk                   (GeglBuffer            *buffer,
                                                 gpointer              *cmy_data,
                                                 gpointer              *key_data,
                                                 gpointer              *alpha_data,
                                                 const Babl            *type,
                                                 const Babl            *space,
                                                 gint                   width,
                                                 gint                   height,
                                                 gint                   bit_depth,
                                                 gboolean               has_alpha);


G_DEFINE_TYPE (JpegXL, jpegxl, GIMP_TYPE_PLUG_IN)

GIMP_MAIN (JPEGXL_TYPE)
DEFINE_STD_SET_I18N

static void
jpegxl_class_init (JpegXLClass *klass)
{
  GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);

  plug_in_class->query_procedures = jpegxl_query_procedures;
  plug_in_class->create_procedure = jpegxl_create_procedure;
  plug_in_class->set_i18n         = STD_SET_I18N;
}

static void
jpegxl_init (JpegXL *jpeg_xl)
{
}

static GList *
jpegxl_query_procedures (GimpPlugIn *plug_in)
{
  GList *list = NULL;

  list = g_list_append (list, g_strdup (LOAD_PROC));
  list = g_list_append (list, g_strdup (EXPORT_PROC));

  return list;
}

static GimpProcedure *
jpegxl_create_procedure (GimpPlugIn  *plug_in,
                         const gchar *name)
{
  GimpProcedure *procedure = NULL;

  if (! strcmp (name, LOAD_PROC))
    {
      procedure = gimp_load_procedure_new (plug_in, name,
                                           GIMP_PDB_PROC_TYPE_PLUGIN,
                                           jpegxl_load, NULL, NULL);

      gimp_procedure_set_menu_label (procedure, _("JPEG XL image"));

      gimp_procedure_set_documentation (procedure,
                                        _("Loads files in the JPEG XL file format"),
                                        _("Loads files in the JPEG XL file format"),
                                        name);
      gimp_procedure_set_attribution (procedure,
                                      "Daniel Novomesky",
                                      "(C) 2021 Daniel Novomesky",
                                      "2021");

      gimp_file_procedure_set_mime_types (GIMP_FILE_PROCEDURE (procedure),
                                          "image/jxl");
      gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
                                          "jxl");
      gimp_file_procedure_set_magics (GIMP_FILE_PROCEDURE (procedure),
                                      "0,string,\xFF\x0A,0,string,\\000\\000\\000\x0CJXL\\040\\015\\012\x87\\012");

    }
  else if (! strcmp (name, EXPORT_PROC))
    {
      procedure = gimp_export_procedure_new (plug_in, name,
                                             GIMP_PDB_PROC_TYPE_PLUGIN,
                                             FALSE, jpegxl_export, NULL, NULL);

      gimp_procedure_set_image_types (procedure, "RGB*, GRAY*");

      gimp_procedure_set_menu_label (procedure, _("JPEG XL image"));

      gimp_procedure_set_documentation (procedure,
                                        _("Saves files in the JPEG XL file format"),
                                        _("Saves files in the JPEG XL file format"),
                                        name);
      gimp_procedure_set_attribution (procedure,
                                      "Daniel Novomesky",
                                      "(C) 2021 Daniel Novomesky",
                                      "2021");

      gimp_file_procedure_set_format_name (GIMP_FILE_PROCEDURE (procedure),
                                           "JPEG XL");
      gimp_file_procedure_set_mime_types (GIMP_FILE_PROCEDURE (procedure),
                                          "image/jxl");
      gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
                                          "jxl");

      gimp_export_procedure_set_capabilities (GIMP_EXPORT_PROCEDURE (procedure),
                                              GIMP_EXPORT_CAN_HANDLE_RGB  |
                                              GIMP_EXPORT_CAN_HANDLE_GRAY |
                                              GIMP_EXPORT_CAN_HANDLE_ALPHA,
                                              NULL, NULL, NULL);

      gimp_procedure_add_boolean_argument (procedure, "lossless",
                                           _("L_ossless"),
                                           _("Use lossless compression"),
                                           FALSE,
                                           G_PARAM_READWRITE);

      gimp_procedure_add_double_argument (procedure, "compression",
                                          _("Co_mpression/maxError"),
                                          _("Max. butteraugli distance, lower = higher quality. Range: 0 .. 15. 1.0 = visually lossless."),
                                          0.1, 15, 1,
                                          G_PARAM_READWRITE);

      gimp_procedure_add_int_argument (procedure, "save-bit-depth",
                                       _("_Bit depth"),
                                       _("Bit depth of exported image"),
                                       8, 16, 8,
                                       G_PARAM_READWRITE);

      gimp_procedure_add_int_argument (procedure, "speed",
                                       _("Effort/S_peed"),
                                       _("Encoder effort setting:\n"
                                         "- 1: faster encoding but bigger files\n"
                                         "- 10: slower encoding but smaller files"),
                                       1, 10, 7,
                                       G_PARAM_READWRITE);

      gimp_procedure_add_boolean_argument (procedure, "cmyk",
                                           _("Export as CMY_K"),
                                           _("Create a CMYK JPEG XL image using the soft-proofing color profile"),
                                           FALSE,
                                           G_PARAM_READWRITE);

      gimp_procedure_add_boolean_argument (procedure, "include-exif",
                                           _("Save Exi_f"),
                                           _("Toggle saving Exif data"),
                                           gimp_export_exif (),
                                           G_PARAM_READWRITE);

      gimp_procedure_add_boolean_argument (procedure, "include-xmp",
                                           _("Save _XMP"),
                                           _("Toggle saving XMP data"),
                                           gimp_export_xmp (),
                                           G_PARAM_READWRITE);
    }

  return procedure;
}

/* The Key data is stored in a separate extra
 * channel. We combine the CMY values from the
 * main image with the K values to create
 * the final layer buffer.
 */
static void
create_cmyk_layer (GimpImage   *image,
                   GimpLayer   *layer,
                   const gchar *type_format,
                   const Babl  *space,
                   gpointer     cmy_data,
                   gpointer     key_data,
                   gint         bit_depth,
                   gboolean     has_alpha)
{
  const Babl         *cmy_format   = NULL;
  const Babl         *cmyka_format = NULL;
  const Babl         *key_format   = NULL;
  const Babl         *rgb_format   = NULL;
  GeglBuffer         *output_buffer;
  GeglBuffer         *picture_buffer;
  GeglBuffer         *cmy_buffer;
  GeglBuffer         *key_buffer;
  GeglBufferIterator *iter;
  GeglColor          *fill_color   = gegl_color_new ("rgba(0.0,0.0,0.0,0.0)");
  gint                width;
  gint                height;
  gint                n_components = 3;
  const Babl         *type         = babl_type (type_format);
  GString            *rgb_type     = g_string_new (NULL);
  GString            *cmy_type     = g_string_new (NULL);
  GString            *cmyka_type   = g_string_new (NULL);

  width  = gimp_image_get_width (image);
  height = gimp_image_get_height (image);

  if (has_alpha)
    n_components = 4;

  gimp_image_insert_layer (image, layer, NULL, 0);
  output_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));

  g_string_printf (rgb_type, has_alpha ? "R'G'B'A %s" : "R'G'B' %s", type_format);
  g_string_printf (cmy_type, "cmyk %s", type_format);
  g_string_printf (cmyka_type, "cmykA %s", type_format);

  rgb_format = babl_format (rgb_type->str);
  cmy_format = babl_format_with_space ( cmy_type->str, space);
  cmyka_format = babl_format_with_space ( cmyka_type->str, space);

  key_format = babl_format_new (babl_model ("Y"),
                                type,
                                babl_component ("Y"),
                                NULL);

  cmy_format = babl_format_with_space (babl_format_get_encoding (cmy_format),
                                       space);
  cmyka_format = babl_format_with_space (babl_format_get_encoding (cmyka_format),
                                         space);
  key_format = babl_format_with_space (babl_format_get_encoding (key_format),
                                       space);

  picture_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                    has_alpha ? cmyka_format : cmy_format);
  gegl_buffer_set_color (picture_buffer, NULL, fill_color);

  cmy_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                babl_format_n (type, n_components));
  key_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                key_format);

  gegl_buffer_set (cmy_buffer, GEGL_RECTANGLE (0, 0, width, height), 0,
                   babl_format_n (type, n_components), cmy_data,
                   GEGL_AUTO_ROWSTRIDE);
  gegl_buffer_set (key_buffer, GEGL_RECTANGLE (0, 0, width, height), 0,
                   key_format, key_data, GEGL_AUTO_ROWSTRIDE);

  iter = gegl_buffer_iterator_new (picture_buffer,
                                   GEGL_RECTANGLE (0, 0, width, height), 0,
                                   has_alpha ? cmyka_format : cmy_format,
                                   GEGL_BUFFER_READWRITE,
                                   GEGL_ABYSS_NONE, 4);

  gegl_buffer_iterator_add (iter, cmy_buffer,
                            GEGL_RECTANGLE (0, 0, width, height), 0,
                            babl_format_n (type, n_components),
                            GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
  gegl_buffer_iterator_add (iter, key_buffer,
                            GEGL_RECTANGLE (0, 0, width, height), 0,
                            key_format, GEGL_ACCESS_READ, GEGL_ABYSS_NONE);

  gegl_buffer_iterator_add (iter, output_buffer,
                            GEGL_RECTANGLE (0, 0, width, height), 0,
                            rgb_format, GEGL_BUFFER_READWRITE, GEGL_ABYSS_NONE);

  while (gegl_buffer_iterator_next (iter))
    {
      guchar *pixel  = iter->items[0].data;
      guchar *cmy    = iter->items[1].data;
      guchar *k      = iter->items[2].data;
      guchar *output = iter->items[3].data;
      gint    length = iter->length;
      gint    row    = length;

      while (length--)
        {
          gint i;

          for (i = 0; i < 3 * bit_depth; i++)
            pixel[i] = cmy[i];

          for (i = 0; i < bit_depth; i++)
            pixel[i + (3 * bit_depth)] = k[i];

          if (has_alpha)
            {
              for (i = 0; i < bit_depth; i++)
                pixel[i + (4 * bit_depth)] = cmy[i + (3 * bit_depth)];
            }

          pixel += 4 * bit_depth;
          cmy   += 3 * bit_depth;
          k     += bit_depth;

          if (has_alpha)
            {
              pixel += bit_depth;
              cmy   += bit_depth;
            }

          output += 4 * bit_depth;
        }

        /* Convert row from CMYK/A to RGB, due to layer buffers
         * having a maximum of 4 colors currently */
        pixel -= (4 * bit_depth) * row;
        if (has_alpha)
          pixel -= row * bit_depth;
        output -= (4 * bit_depth) * row;

        babl_process (babl_fish (has_alpha ? cmyka_format : cmy_format, rgb_format),
                      pixel, output, row);
    }

  g_object_unref (output_buffer);
  g_object_unref (picture_buffer);
  g_object_unref (cmy_buffer);
  g_object_unref (key_buffer);
  g_free (key_data);

  g_string_free (cmyka_type, TRUE);
  g_string_free (cmy_type, TRUE);
  g_string_free (rgb_type, TRUE);
}

static GimpImage *
load_image (GFile                 *file,
            GimpRunMode            runmode,
            GimpMetadata          *metadata,
            GimpMetadataLoadFlags *flags,
            GError               **error)
{
  FILE             *inputFile = g_fopen (g_file_peek_path (file), "rb");

  gsize             inputFileSize;
  gpointer          memory;

  JxlSignature      signature;
  JxlDecoder       *decoder;
  void             *runner;
  JxlBasicInfo      basicinfo;
  JxlDecoderStatus  status;
  JxlPixelFormat    pixel_format;
  JxlColorEncoding  color_encoding;
  size_t            icc_size        = 0;
  GimpColorProfile *profile         = NULL;
  gboolean          loadlinear      = FALSE;
  size_t            channel_depth;
  size_t            result_size;
  size_t            extra_channel_size = 0;
  gpointer          picture_buffer;
  gpointer          key_buffer      = NULL;
  gboolean          is_cmyk         = FALSE;
  gint              cmyk_channel_id = -1;
  GimpImage        *image;
  GimpLayer        *layer;
  GeglBuffer       *buffer;
  const Babl       *space           = NULL;
  const gchar      *type;
  GimpPrecision     precision_linear;
  GimpPrecision     precision_non_linear;
  uint32_t          i;

  if (!inputFile)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Cannot open file for read: %s\n",
                   g_file_peek_path (file));
      return NULL;
    }

  fseek (inputFile, 0, SEEK_END);
  inputFileSize = ftell (inputFile);
  fseek (inputFile, 0, SEEK_SET);

  if (inputFileSize < 1)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "File too small: %s\n",
                   g_file_peek_path (file));
      fclose (inputFile);
      return NULL;
    }

  memory = g_malloc (inputFileSize);
  if (fread (memory, 1, inputFileSize, inputFile) != inputFileSize)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Failed to read %zu bytes: %s\n", inputFileSize,
                   g_file_peek_path (file));
      fclose (inputFile);
      g_free (memory);
      return NULL;
    }

  fclose (inputFile);

  signature = JxlSignatureCheck (memory, inputFileSize);
  if (signature != JXL_SIG_CODESTREAM && signature != JXL_SIG_CONTAINER)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "File %s is probably not in JXL format!\n",
                   g_file_peek_path (file));
      g_free (memory);
      return NULL;
    }

  decoder = JxlDecoderCreate (NULL);
  if (!decoder)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JxlDecoderCreate failed");
      g_free (memory);
      return NULL;
    }

  runner = JxlThreadParallelRunnerCreate (NULL, gimp_get_num_processors ());
  if (JxlDecoderSetParallelRunner (decoder, JxlThreadParallelRunner, runner) != JXL_DEC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JxlDecoderSetParallelRunner failed");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (JxlDecoderSetInput (decoder, memory, inputFileSize) != JXL_DEC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JxlDecoderSetInput failed");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  JxlDecoderCloseInput (decoder);

  if (JxlDecoderSubscribeEvents (decoder, JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE) != JXL_DEC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JxlDecoderSubscribeEvents failed");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  status = JxlDecoderProcessInput (decoder);
  if (status == JXL_DEC_ERROR)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JXL decoding failed");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (status == JXL_DEC_NEED_MORE_INPUT)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JXL data incomplete");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  status = JxlDecoderGetBasicInfo (decoder, &basicinfo);
  if (status != JXL_DEC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JXL basic info not available");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (basicinfo.xsize == 0 || basicinfo.ysize == 0)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JXL image has zero dimensions");
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  status = JxlDecoderProcessInput (decoder);
  if (status != JXL_DEC_COLOR_ENCODING)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Unexpected event %d instead of JXL_DEC_COLOR_ENCODING", status);
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (basicinfo.uses_original_profile == JXL_FALSE)
    {
      if (basicinfo.num_color_channels == 3)
        {
          JxlColorEncodingSetToSRGB (&color_encoding, JXL_FALSE);
          JxlDecoderSetPreferredColorProfile (decoder, &color_encoding);
        }
      else if (basicinfo.num_color_channels == 1)
        {
          JxlColorEncodingSetToSRGB (&color_encoding, JXL_TRUE);
          JxlDecoderSetPreferredColorProfile (decoder, &color_encoding);
        }
    }

  pixel_format.endianness = JXL_NATIVE_ENDIAN;
  pixel_format.align = 0;

  if (basicinfo.uses_original_profile == JXL_FALSE || basicinfo.bits_per_sample > 16)
    {
      pixel_format.data_type = JXL_TYPE_FLOAT;
      channel_depth = 4;
      precision_linear = GIMP_PRECISION_FLOAT_LINEAR;
      precision_non_linear = GIMP_PRECISION_FLOAT_NON_LINEAR;
      type = "float";
    }
  else if (basicinfo.bits_per_sample <= 8)
    {
      pixel_format.data_type = JXL_TYPE_UINT8;
      channel_depth = 1;
      precision_linear = GIMP_PRECISION_U8_LINEAR;
      precision_non_linear = GIMP_PRECISION_U8_NON_LINEAR;
      type = "u8";
    }
  else if (basicinfo.exponent_bits_per_sample == 0)
    {
      pixel_format.data_type = JXL_TYPE_UINT16;
      channel_depth = 2;
      precision_linear = GIMP_PRECISION_U16_LINEAR;
      precision_non_linear = GIMP_PRECISION_U16_NON_LINEAR;
      type = "u16";
    }
  else
    {
      pixel_format.data_type = JXL_TYPE_FLOAT16;
      channel_depth = 2;
      precision_linear = GIMP_PRECISION_HALF_LINEAR;
      precision_non_linear = GIMP_PRECISION_HALF_NON_LINEAR;
      type = "half";
    }

  if (basicinfo.num_color_channels == 1) /* grayscale */
    {
      if (basicinfo.alpha_bits > 0)
        {
          pixel_format.num_channels = 2;
        }
      else
        {
          pixel_format.num_channels = 1;
        }
    }
  else /* RGB or CMYK */
    {

      if (basicinfo.alpha_bits > 0) /* RGB with alpha */
        {
          pixel_format.num_channels = 4;
        }
      else /* RGB no alpha */
        {
          pixel_format.num_channels = 3;
        }

      /* search if BLACK (K) channel is present (CMYK detection) */
      for (i = 0; i < basicinfo.num_extra_channels; i++)
        {
          JxlExtraChannelInfo extra;

          if (JXL_DEC_SUCCESS != JxlDecoderGetExtraChannelInfo (decoder, i, &extra))
            break;

          if (extra.type == JXL_CHANNEL_BLACK)
            {
              is_cmyk = TRUE;
              cmyk_channel_id = i;
              extra_channel_size = channel_depth * (size_t) basicinfo.xsize * (size_t) basicinfo.ysize;
              break;
            }
        }
    }

  result_size = channel_depth * pixel_format.num_channels * (size_t) basicinfo.xsize * (size_t) basicinfo.ysize;
  result_size += extra_channel_size;


  if (JxlDecoderGetColorAsEncodedProfile (decoder,
#if JPEGXL_NUMERIC_VERSION < JPEGXL_COMPUTE_NUMERIC_VERSION(0,9,0)
                                          &pixel_format,
#endif
                                          JXL_COLOR_PROFILE_TARGET_DATA,
                                          &color_encoding) == JXL_DEC_SUCCESS)
    {
      if (color_encoding.white_point == JXL_WHITE_POINT_D65)
        {
          switch (color_encoding.transfer_function)
            {
            case JXL_TRANSFER_FUNCTION_LINEAR:
              loadlinear = TRUE;

              switch (color_encoding.color_space)
                {
                case JXL_COLOR_SPACE_RGB:
                  profile = gimp_color_profile_new_rgb_srgb_linear ();
                  break;
                case JXL_COLOR_SPACE_GRAY:
                  profile = gimp_color_profile_new_d65_gray_linear ();
                  break;
                default:
                  break;
                }
              break;
            case JXL_TRANSFER_FUNCTION_SRGB:
              switch (color_encoding.color_space)
                {
                case JXL_COLOR_SPACE_RGB:
                  profile = gimp_color_profile_new_rgb_srgb ();
                  break;
                case JXL_COLOR_SPACE_GRAY:
                  profile = gimp_color_profile_new_d65_gray_srgb_trc ();
                  break;
                default:
                  break;
                }
              break;
            default:
              break;
            }
        }
    }

  if (! profile)
    {
      if (JxlDecoderGetICCProfileSize (decoder,
#if JPEGXL_NUMERIC_VERSION < JPEGXL_COMPUTE_NUMERIC_VERSION(0,9,0)
                                       &pixel_format,
#endif
                                       JXL_COLOR_PROFILE_TARGET_DATA,
                                       &icc_size) == JXL_DEC_SUCCESS)
        {
          if (icc_size > 0)
            {
              gpointer raw_icc_profile = g_malloc (icc_size);

              if (JxlDecoderGetColorAsICCProfile (decoder,
#if JPEGXL_NUMERIC_VERSION < JPEGXL_COMPUTE_NUMERIC_VERSION(0,9,0)
                                                  &pixel_format,
#endif
                                                  JXL_COLOR_PROFILE_TARGET_DATA,
                                                  raw_icc_profile, icc_size)
                  == JXL_DEC_SUCCESS)
                {
                  profile = gimp_color_profile_new_from_icc_profile (raw_icc_profile, icc_size, error);
                  if (profile)
                    {
                      loadlinear = gimp_color_profile_is_linear (profile);
                    }
                  else
                    {
                      g_printerr ("%s: Failed to read ICC profile: %s\n", G_STRFUNC, (*error)->message);
                      g_clear_error (error);
                    }
                }
              else
                {
                  g_printerr ("Failed to obtain data from JPEG XL decoder");
                }

              g_free (raw_icc_profile);
            }
          else
            {
              g_printerr ("Empty ICC data");
            }
        }
      else
        {
          g_message ("no ICC, other color profile");
        }
    }

  status = JxlDecoderProcessInput (decoder);
  if (status != JXL_DEC_NEED_IMAGE_OUT_BUFFER)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Unexpected event %d instead of JXL_DEC_NEED_IMAGE_OUT_BUFFER", status);
      if (profile)
        {
          g_object_unref (profile);
        }
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  picture_buffer = g_try_malloc (result_size);
  if (! picture_buffer)
    {
      g_set_error (error, G_FILE_ERROR, 0, "Memory could not be allocated.");
      if (profile)
        {
          g_object_unref (profile);
        }
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (JxlDecoderSetImageOutBuffer (decoder, &pixel_format, picture_buffer, result_size) != JXL_DEC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "ERROR: JxlDecoderSetImageOutBuffer failed");
      if (profile)
        {
          g_object_unref (profile);
        }
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  /* Loading key channel buffer data */
  if (is_cmyk)
    {
      if (JxlDecoderExtraChannelBufferSize (decoder, &pixel_format,
                                            &result_size, cmyk_channel_id)
          != JXL_DEC_SUCCESS)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "ERROR: JxlDecoderExtraChannelBufferSize failed");
          if (profile)
            g_object_unref (profile);

          JxlThreadParallelRunnerDestroy (runner);
          JxlDecoderDestroy (decoder);
          g_free (memory);
          return NULL;
        }

      key_buffer = g_try_malloc (result_size);

      if (! key_buffer)
        {
          g_set_error (error, G_FILE_ERROR, 0, "Memory could not be allocated.");

          if (profile)
            g_object_unref (profile);

          JxlThreadParallelRunnerDestroy (runner);
          JxlDecoderDestroy (decoder);
          g_free (memory);
          return NULL;
        }

      if (JxlDecoderSetExtraChannelBuffer (decoder, &pixel_format, key_buffer,
                                           result_size, cmyk_channel_id)
          != JXL_DEC_SUCCESS)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "ERROR: JxlDecoderSetExtraChannelBuffer failed");
          if (profile)
            g_object_unref (profile);

          JxlThreadParallelRunnerDestroy (runner);
          JxlDecoderDestroy (decoder);
          g_free (memory);
          return NULL;
        }
    }

  status = JxlDecoderProcessInput (decoder);
  if (status != JXL_DEC_FULL_IMAGE)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Unexpected event %d instead of JXL_DEC_FULL_IMAGE", status);
      g_free (picture_buffer);
      if (profile)
        {
          g_object_unref (profile);
        }
      JxlThreadParallelRunnerDestroy (runner);
      JxlDecoderDestroy (decoder);
      g_free (memory);
      return NULL;
    }

  if (basicinfo.num_color_channels == 1) /* grayscale */
    {
      image = gimp_image_new_with_precision (basicinfo.xsize, basicinfo.ysize, GIMP_GRAY,
                                             loadlinear ? precision_linear : precision_non_linear);

      if (profile)
        {
          if (gimp_color_profile_is_gray (profile))
            {
              gimp_image_set_color_profile (image, profile);
            }
        }

      layer = gimp_layer_new (image, "Background",
                              basicinfo.xsize, basicinfo.ysize,
                              (basicinfo.alpha_bits > 0) ? GIMP_GRAYA_IMAGE : GIMP_GRAY_IMAGE, 100,
                              gimp_image_get_default_new_layer_mode (image));
    }
  else /* RGB or CMYK */
    {
      image = gimp_image_new_with_precision (basicinfo.xsize, basicinfo.ysize, GIMP_RGB,
                                             loadlinear ? precision_linear : precision_non_linear);

      if (profile)
        {
          if (gimp_color_profile_is_rgb (profile))
            {
              gimp_image_set_color_profile (image, profile);
            }
          else if (is_cmyk && gimp_color_profile_is_cmyk (profile))
            {
              gimp_image_set_simulation_profile (image, profile);

              space = gimp_color_profile_get_space (profile,
                                                    GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
                                                    NULL);
            }
        }

      layer = gimp_layer_new (image, "Background",
                              basicinfo.xsize, basicinfo.ysize,
                              (basicinfo.alpha_bits > 0) ? GIMP_RGBA_IMAGE : GIMP_RGB_IMAGE, 100,
                              gimp_image_get_default_new_layer_mode (image));
    }

  if (is_cmyk)
    {
      create_cmyk_layer (image, layer, type, space, picture_buffer,
                         key_buffer, channel_depth, basicinfo.alpha_bits > 0);
    }
  else
    {
      gimp_image_insert_layer (image, layer, NULL, 0);

      buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));

      gegl_buffer_set (buffer, GEGL_RECTANGLE (0, 0, basicinfo.xsize, basicinfo.ysize), 0,
                       NULL, picture_buffer, GEGL_AUTO_ROWSTRIDE);

      g_object_unref (buffer);
  }

  g_free (picture_buffer);
  if (profile)
    {
      g_object_unref (profile);
    }

  if (metadata)
    {
      if (basicinfo.have_container)
        {
          JxlDecoderReleaseInput (decoder);
          JxlDecoderRewind (decoder);

          if (JxlDecoderSetInput (decoder, memory, inputFileSize) != JXL_DEC_SUCCESS)
            {
              g_printerr ("%s: JxlDecoderSetInput failed after JxlDecoderRewind\n", G_STRFUNC);
            }
          else
            {
              JxlDecoderCloseInput (decoder);
              if (JxlDecoderSubscribeEvents (decoder, JXL_DEC_BOX) != JXL_DEC_SUCCESS)
                {
                  g_printerr ("%s: JxlDecoderSubscribeEvents for JXL_DEC_BOX failed\n", G_STRFUNC);
                }
              else
                {
                  gboolean    search_exif  = TRUE;
                  gboolean    search_xmp   = TRUE;
                  gboolean    success_exif = FALSE;
                  gboolean    success_xmp  = FALSE;
                  JxlBoxType  box_type     = { 0, 0, 0, 0 };
                  GByteArray *exif_box     = NULL;
                  GByteArray *xml_box      = NULL;
                  size_t      exif_remains = 0;
                  size_t      xml_remains  = 0;

                  while (search_exif || search_xmp)
                    {
                      status = JxlDecoderProcessInput (decoder);
                      switch (status)
                        {
                        case JXL_DEC_SUCCESS:
                          if (box_type[0] == 'E' && box_type[1] == 'x' && box_type[2] == 'i' && box_type[3] == 'f' && search_exif)
                            {
                              exif_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (exif_box, exif_box->len - exif_remains);
                              success_exif = TRUE;
                            }
                          else if (box_type[0] == 'x' && box_type[1] == 'm' && box_type[2] == 'l' && box_type[3] == ' ' && search_xmp)
                            {
                              xml_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (xml_box, xml_box->len - xml_remains);
                              success_xmp = TRUE;
                            }

                          search_exif = FALSE;
                          search_xmp  = FALSE;
                          break;
                        case JXL_DEC_ERROR:
                          search_exif = FALSE;
                          search_xmp  = FALSE;
                          g_printerr ("%s: Metadata decoding error\n", G_STRFUNC);
                          break;
                        case JXL_DEC_NEED_MORE_INPUT:
                          search_exif = FALSE;
                          search_xmp  = FALSE;
                          g_printerr ("%s: JXL metadata are probably incomplete\n", G_STRFUNC);
                          break;
                        case JXL_DEC_BOX:
                          JxlDecoderSetDecompressBoxes (decoder, JXL_TRUE);

                          if (box_type[0] == 'E' && box_type[1] == 'x' && box_type[2] == 'i' && box_type[3] == 'f' && search_exif && exif_box)
                            {
                              exif_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (exif_box, exif_box->len - exif_remains);

                              search_exif  = FALSE;
                              success_exif = TRUE;
                            }
                          else if (box_type[0] == 'x' && box_type[1] == 'm' && box_type[2] == 'l' && box_type[3] == ' ' && search_xmp && xml_box)
                            {
                              xml_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (xml_box, xml_box->len - xml_remains);

                              search_xmp  = FALSE;
                              success_xmp = TRUE;
                            }

                          if (JxlDecoderGetBoxType (decoder, box_type, JXL_TRUE) == JXL_DEC_SUCCESS)
                            {
                              if (box_type[0] == 'E' && box_type[1] == 'x' && box_type[2] == 'i' && box_type[3] == 'f' && search_exif)
                                {
                                  exif_box = g_byte_array_sized_new (4096);
                                  g_byte_array_set_size (exif_box, 4096);

                                  JxlDecoderSetBoxBuffer (decoder, exif_box->data, exif_box->len);
                                }
                              else if (box_type[0] == 'x' && box_type[1] == 'm' && box_type[2] == 'l' && box_type[3] == ' ' && search_xmp)
                                {
                                  xml_box = g_byte_array_sized_new (4096);
                                  g_byte_array_set_size (xml_box, 4096);

                                  JxlDecoderSetBoxBuffer (decoder, xml_box->data, xml_box->len);
                                }
                            }
                          else
                            {
                              search_exif = FALSE;
                              search_xmp  = FALSE;
                              g_printerr ("%s: Error in JxlDecoderGetBoxType\n", G_STRFUNC);
                            }
                          break;
                        case JXL_DEC_BOX_NEED_MORE_OUTPUT:
                          if (box_type[0] == 'E' && box_type[1] == 'x' && box_type[2] == 'i' && box_type[3] == 'f' && search_exif)
                            {
                              exif_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (exif_box, exif_box->len + 4096);
                              JxlDecoderSetBoxBuffer (decoder, exif_box->data + exif_box->len - (4096 + exif_remains), 4096 + exif_remains);
                            }
                          else if (box_type[0] == 'x' && box_type[1] == 'm' && box_type[2] == 'l' && box_type[3] == ' ' && search_xmp)
                            {
                              xml_remains = JxlDecoderReleaseBoxBuffer (decoder);
                              g_byte_array_set_size (xml_box, xml_box->len + 4096);
                              JxlDecoderSetBoxBuffer (decoder, xml_box->data + xml_box->len - (4096 + xml_remains), 4096 + xml_remains);
                            }
                          else
                            {
                              search_exif = FALSE;
                              search_xmp  = FALSE;
                            }
                          break;
                        default:
                          break;
                        }
                    }

                  if (success_exif || success_xmp)
                    {
                      gexiv2_metadata_clear (GEXIV2_METADATA (metadata));

                      if (success_exif && exif_box)
                        {
                          const guint8  tiffHeaderBE[4] = { 'M', 'M', 0, 42 };
                          const guint8  tiffHeaderLE[4] = { 'I', 'I', 42, 0 };
                          const guint8 *tiffheader      = exif_box->data;
                          glong         new_exif_size   = exif_box->len;

                          while (new_exif_size >= 4) /*Searching for TIFF Header*/
                            {
                              if (tiffheader[0] == tiffHeaderBE[0] && tiffheader[1] == tiffHeaderBE[1] &&
                                  tiffheader[2] == tiffHeaderBE[2] && tiffheader[3] == tiffHeaderBE[3])
                                {
                                  break;
                                }
                              if (tiffheader[0] == tiffHeaderLE[0] && tiffheader[1] == tiffHeaderLE[1] &&
                                  tiffheader[2] == tiffHeaderLE[2] && tiffheader[3] == tiffHeaderLE[3])
                                {
                                  break;
                                }
                              new_exif_size--;
                              tiffheader++;
                            }

                          if (new_exif_size > 4) /* TIFF header + some data found*/
                            {
                              if (! gexiv2_metadata_open_buf (GEXIV2_METADATA (metadata), tiffheader, new_exif_size, error))
                                {
                                  g_printerr ("%s: Failed to set EXIF metadata: %s\n", G_STRFUNC, (*error)->message);
                                  g_clear_error (error);
                                }
                            }
                          else
                            {
                              g_printerr ("%s: EXIF metadata not set\n", G_STRFUNC);
                            }
                        }

                      if (success_xmp && xml_box)
                        {
                          if (! gimp_metadata_set_from_xmp (metadata, xml_box->data, xml_box->len, error))
                            {
                              g_printerr ("%s: Failed to set XMP metadata: %s\n", G_STRFUNC, (*error)->message);
                              g_clear_error (error);
                            }
                        }
                    }

                  if (exif_box)
                    {
                      g_byte_array_free (exif_box, TRUE);
                    }

                  if (xml_box)
                    {
                      g_byte_array_free (xml_box, TRUE);
                    }
                }
            }
        }

      gexiv2_metadata_try_set_orientation (GEXIV2_METADATA (metadata),
                                           GEXIV2_ORIENTATION_NORMAL, NULL);
      gexiv2_metadata_try_set_metadata_pixel_width (GEXIV2_METADATA (metadata),
                                                    basicinfo.xsize, NULL);
      gexiv2_metadata_try_set_metadata_pixel_height (GEXIV2_METADATA (metadata),
                                                     basicinfo.ysize, NULL);

      *flags = GIMP_METADATA_LOAD_COMMENT | GIMP_METADATA_LOAD_RESOLUTION;
    }

  JxlThreadParallelRunnerDestroy (runner);
  JxlDecoderDestroy (decoder);
  g_free (memory);
  return image;
}

static GimpValueArray *
jpegxl_load (GimpProcedure         *procedure,
             GimpRunMode            run_mode,
             GFile                 *file,
             GimpMetadata          *metadata,
             GimpMetadataLoadFlags *flags,
             GimpProcedureConfig   *config,
             gpointer               run_data)
{
  GimpValueArray *return_vals;
  GimpImage      *image;
  GError         *error = NULL;

  gegl_init (NULL, NULL);

  image = load_image (file, run_mode, metadata, flags, &error);

  if (! image)
    return gimp_procedure_new_return_values (procedure,
                                             GIMP_PDB_EXECUTION_ERROR,
                                             error);

  return_vals = gimp_procedure_new_return_values (procedure,
                                                  GIMP_PDB_SUCCESS,
                                                  NULL);

  GIMP_VALUES_SET_IMAGE (return_vals, 1, image);

  return return_vals;
}

static void
extract_cmyk (GeglBuffer *buffer,
              gpointer   *cmy_data,
              gpointer   *key_data,
              gpointer   *alpha_data,
              const Babl *type,
              const Babl *space,
              gint        width,
              gint        height,
              gint        bit_depth,
              gboolean    has_alpha)
{
  GeglBuffer         *cmy_buffer;
  GeglBuffer         *key_buffer;
  GeglBuffer         *alpha_buffer = NULL;
  const Babl         *format;
  const Babl         *key_format   = NULL;
  GeglBufferIterator *iter;
  GeglColor          *white        = gegl_color_new ("white");

  if (has_alpha)
    {
      format = babl_format_new (babl_model ("cmykA"),
                                type,
                                babl_component ("cyan"),
                                babl_component ("magenta"),
                                babl_component ("yellow"),
                                babl_component ("key"),
                                babl_component ("A"),
                                NULL);
    }
  else
    {
      format = babl_format_new (babl_model ("cmyk"),
                                type,
                                babl_component ("cyan"),
                                babl_component ("magenta"),
                                babl_component ("yellow"),
                                babl_component ("key"),
                                NULL);
    }
  format = babl_format_with_space (babl_format_get_encoding (format), space);

  key_format = babl_format_new (babl_model ("Y"),
                                type,
                                babl_component ("Y"),
                                NULL);
  key_format = babl_format_with_space (babl_format_get_encoding (key_format),
                                       space);

  cmy_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                babl_format_n (type, 3));
  gegl_buffer_set_color (cmy_buffer, NULL, white);

  key_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                key_format);
  gegl_buffer_set_color (key_buffer, NULL, white);

  if (has_alpha)
    {
      alpha_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
                                      babl_format_n (type, 1));
      gegl_buffer_set_color (alpha_buffer, NULL, white);
    }

  g_object_unref (white);

  iter = gegl_buffer_iterator_new (buffer,
                                   GEGL_RECTANGLE (0, 0, width, height), 0,
                                   format,
                                   GEGL_BUFFER_READWRITE,
                                   GEGL_ABYSS_NONE, 4);

  gegl_buffer_iterator_add (iter, cmy_buffer,
                            GEGL_RECTANGLE (0, 0, width, height), 0,
                            babl_format_n (type, 3), GEGL_BUFFER_READWRITE,
                            GEGL_ABYSS_NONE);
  gegl_buffer_iterator_add (iter, key_buffer,
                            GEGL_RECTANGLE (0, 0, width, height), 0,
                            key_format, GEGL_BUFFER_READWRITE,
                            GEGL_ABYSS_NONE);
  if (has_alpha)
    gegl_buffer_iterator_add (iter, alpha_buffer,
                              GEGL_RECTANGLE (0, 0, width, height), 0,
                              babl_format_n (type, 1), GEGL_BUFFER_READWRITE,
                              GEGL_ABYSS_NONE);

  while (gegl_buffer_iterator_next (iter))
    {
      guchar *pixel = iter->items[0].data;
      guchar *cmy   = iter->items[1].data;
      guchar *k     = iter->items[2].data;
      guchar *a     = NULL;
      gint length   = iter->length;

      if (has_alpha)
        a = iter->items[3].data;

      while (length--)
        {
          gint range = 1;
          gint i;

          if (bit_depth > 8)
            range = 2;

          for (i = 0; i < (3 * range); i++)
            cmy[i] = pixel[i];

          for (i = 0; i < range; i++)
            k[i] = pixel[i + (3 * range)];

          if (has_alpha)
            {
              for (i = 0; i < range; i++)
                a[i] = pixel[i + (4 * range)];
            }

          pixel += 4 * range;
          cmy   += 3 * range;
          k     += range;

          if (has_alpha)
            {
              a     += range;
              pixel += range;
            }
        }
    }

  gegl_buffer_get (cmy_buffer, GEGL_RECTANGLE (0, 0,
                   width, height), 1.0,
                   babl_format_n (type, 3), *cmy_data,
                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

  gegl_buffer_get (key_buffer, GEGL_RECTANGLE (0, 0,
                   width, height), 1.0,
                   key_format, *key_data,
                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

  if (has_alpha)
    gegl_buffer_get (alpha_buffer, GEGL_RECTANGLE (0, 0,
                     width, height), 1.0,
                     babl_format_n (type, 1), *alpha_data,
                     GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

  g_object_unref (cmy_buffer);
  g_object_unref (key_buffer);
  if (has_alpha)
    g_object_unref (alpha_buffer);
}

static gboolean
export_image (GFile               *file,
              GimpProcedureConfig *config,
              GimpImage           *image,
              GimpDrawable        *drawable,
              GimpMetadata        *metadata,
              GError             **error)
{
  JxlEncoder              *encoder;
  void                    *runner;
  JxlEncoderFrameSettings *encoder_options;
  JxlPixelFormat           pixel_format;
  JxlBasicInfo             output_info;
  JxlColorEncoding         color_profile;
  JxlEncoderStatus         status;
  size_t                   buffer_size;
  size_t                   total_channel_size = 0;
  size_t                   channel_buffer_size = 0;

  GByteArray              *compressed;

  FILE                    *outfile;
  GeglBuffer              *buffer;
  GimpImageType            drawable_type;

  gint                     drawable_width;
  gint                     drawable_height;
  gpointer                 picture_buffer;
  gpointer                 cmy_buffer = NULL;
  gpointer                 key_buffer = NULL;
  gpointer                 alpha_buffer = NULL;

  GimpColorProfile        *profile = NULL;
  const Babl              *file_format = NULL;
  const Babl              *space = NULL;
  const Babl              *type  = NULL;
  gboolean                 out_linear = FALSE;

  size_t                   offset = 0;
  uint8_t                 *next_out;
  size_t                   avail_out;

  gdouble                  compression = 1.0;
  gboolean                 lossless = FALSE;
  gint                     speed = 7;
  gint                     bit_depth = 8;
  gboolean                 cmyk = FALSE;
  gboolean                 save_exif = FALSE;
  gboolean                 save_xmp = FALSE;

  gimp_progress_init_printf (_("Exporting '%s'"),
                             gimp_file_get_utf8_name (file));

  g_object_get (config,
                "lossless",              &lossless,
                "compression",           &compression,
                "speed",                 &speed,
                "save-bit-depth",        &bit_depth,
                "cmyk",                  &cmyk,
                "include-exif",          &save_exif,
                "include-xmp",           &save_xmp,
                NULL);

  if (cmyk)
    {
      /* CMYK is allways saved as lossless */
      lossless = TRUE;
    }

  drawable_type   = gimp_drawable_type (drawable);
  drawable_width  = gimp_drawable_get_width (drawable);
  drawable_height = gimp_drawable_get_height (drawable);

  JxlEncoderInitBasicInfo(&output_info);

  if (lossless)
    {
      output_info.uses_original_profile = JXL_TRUE;

      if (cmyk)
        profile = gimp_image_get_simulation_profile (image);
      else
        profile = gimp_image_get_effective_color_profile (image);

      /* CMYK profile is required for export. If not assigned,
       * disable CMYK flag and revert to RGB */
      if (cmyk && ! profile)
        {
          cmyk = FALSE;
          profile = gimp_image_get_effective_color_profile (image);
        }

      out_linear = gimp_color_profile_is_linear (profile);

      space = gimp_color_profile_get_space (profile,
                                            GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
                                            error);

      if (error && *error)
        {
          g_printerr ("%s: error getting the profile space: %s\n",
                      G_STRFUNC, (*error)->message);
          return FALSE;
        }
    }
  else
    {
      /* 0.1 is actually minimal value for lossy in libjxl 0.5
       * 0.01 is allowed in libjxl 0.6 but
       * using too low value with lossy compression is not wise */
      if (compression < 0.1)
        {
          compression = 0.1;
        }

      output_info.uses_original_profile = JXL_FALSE;
      space = babl_space ("sRGB");
      out_linear = FALSE;
    }

  if (bit_depth > 8)
    {
      pixel_format.data_type = JXL_TYPE_UINT16;
      output_info.bits_per_sample = 16;
    }
  else
    {
      pixel_format.data_type = JXL_TYPE_UINT8;
      output_info.bits_per_sample = 8;
    }

  pixel_format.endianness = JXL_NATIVE_ENDIAN;
  pixel_format.align = 0;

  output_info.xsize = drawable_width;
  output_info.ysize = drawable_height;
  output_info.exponent_bits_per_sample = 0;
  output_info.orientation = JXL_ORIENT_IDENTITY;
  output_info.animation.tps_numerator = 10;
  output_info.animation.tps_denominator = 1;
  output_info.num_extra_channels = 0;

  if (cmyk)
    {
      if (bit_depth > 8)
        {
          file_format = babl_format_with_space (gimp_drawable_has_alpha (drawable) ?
                                                "cmykA u16" : "cmyk u16", space);
          type = babl_type ("u16");
        }
      else
        {
          file_format = babl_format_with_space (gimp_drawable_has_alpha (drawable) ?
                                                "cmykA u8" : "cmyk u8", space);
          type = babl_type ("u8");
        }

      output_info.num_color_channels = 3;
      pixel_format.num_channels = 3;
      JxlColorEncodingSetToSRGB (&color_profile, JXL_FALSE);

      if (gimp_drawable_has_alpha (drawable))
        {
          output_info.num_extra_channels = 2;
          output_info.alpha_bits = 8;
          if (bit_depth > 8)
            output_info.alpha_bits = 16;
          output_info.alpha_exponent_bits = 0;
        }
      else
        {
          output_info.num_extra_channels = 1;
          output_info.alpha_bits = 0;
        }
    }
  else /* For RGB and grayscale export */
    {
      switch (drawable_type)
        {
        case GIMP_GRAYA_IMAGE:
          if (lossless && out_linear)
            {
              file_format = babl_format ( (bit_depth > 8) ? "YA u16" : "YA u8");
              JxlColorEncodingSetToLinearSRGB (&color_profile, JXL_TRUE);
            }
          else
            {
              file_format = babl_format ( (bit_depth > 8) ? "Y'A u16" : "Y'A u8");
              JxlColorEncodingSetToSRGB (&color_profile, JXL_TRUE);
            }
          pixel_format.num_channels = 2;
          output_info.num_color_channels = 1;
          output_info.alpha_bits = (bit_depth > 8) ? 16 : 8;
          output_info.alpha_exponent_bits = 0;
          output_info.num_extra_channels = 1;

          if (profile)
            {
              g_object_unref (profile);
              profile = NULL;
            }
          break;
        case GIMP_GRAY_IMAGE:
          if (lossless && out_linear)
            {
              file_format = babl_format ( (bit_depth > 8) ? "Y u16" : "Y u8");
              JxlColorEncodingSetToLinearSRGB (&color_profile, JXL_TRUE);
            }
          else
            {
              file_format = babl_format ( (bit_depth > 8) ? "Y' u16" : "Y' u8");
              JxlColorEncodingSetToSRGB (&color_profile, JXL_TRUE);
            }
          pixel_format.num_channels = 1;
          output_info.num_color_channels = 1;
          output_info.alpha_bits = 0;

          if (profile)
            {
              g_object_unref (profile);
              profile = NULL;
            }
          break;
        case GIMP_RGBA_IMAGE:
          if (bit_depth > 8)
            {
              file_format = babl_format_with_space (out_linear ? "RGBA u16" : "R'G'B'A u16", space);
              output_info.alpha_bits = 16;
            }
          else
            {
              file_format = babl_format_with_space (out_linear ? "RGBA u8" : "R'G'B'A u8", space);
              output_info.alpha_bits = 8;
            }
          pixel_format.num_channels = 4;
          JxlColorEncodingSetToSRGB (&color_profile, JXL_FALSE);
          output_info.num_color_channels = 3;
          output_info.alpha_exponent_bits = 0;
          output_info.num_extra_channels = 1;
          break;
        case GIMP_RGB_IMAGE:
          if (bit_depth > 8)
            {
              file_format = babl_format_with_space (out_linear ? "RGB u16" : "R'G'B' u16", space);
            }
          else
            {
              file_format = babl_format_with_space (out_linear ? "RGB u8" : "R'G'B' u8", space);
            }
          pixel_format.num_channels = 3;
          JxlColorEncodingSetToSRGB (&color_profile, JXL_FALSE);
          output_info.num_color_channels = 3;
          output_info.alpha_bits = 0;
          break;
        default:
          if (profile)
            {
              g_object_unref (profile);
            }
          return FALSE;
          break;
        }
    }

  if (bit_depth > 8)
    {
      buffer_size = 2 * pixel_format.num_channels * (size_t) output_info.xsize * (size_t) output_info.ysize;
      total_channel_size =
        2 * output_info.num_extra_channels * (size_t) output_info.xsize * (size_t) output_info.ysize;
    }
  else
    {
      buffer_size = pixel_format.num_channels * (size_t) output_info.xsize * (size_t) output_info.ysize;
      total_channel_size =
        output_info.num_extra_channels * (size_t) output_info.xsize * (size_t) output_info.ysize;
    }

  /* The maximum number of channels for JPEG XL is 3.
     The image may have more (e.g. CMYKA), so we'll combine them
     for the initial GeglBuffer loading */
  total_channel_size += buffer_size;

  picture_buffer = g_malloc (total_channel_size);

  gimp_progress_update (0.3);

  buffer = gimp_drawable_get_buffer (drawable);
  gegl_buffer_get (buffer, GEGL_RECTANGLE (0, 0,
                   drawable_width, drawable_height), 1.0,
                   file_format, picture_buffer,
                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

  /* Copying K value to buffer */
  if (cmyk)
    {
      channel_buffer_size = (size_t) output_info.xsize * (size_t) output_info.ysize;
      if (bit_depth > 8)
        channel_buffer_size *= 2;

      cmy_buffer = g_malloc (buffer_size);
      key_buffer = g_malloc (channel_buffer_size);

      if (gimp_drawable_has_alpha (drawable))
        alpha_buffer = g_malloc (channel_buffer_size);

      extract_cmyk (buffer, &cmy_buffer, &key_buffer, &alpha_buffer,
                    type, space, output_info.xsize, output_info.ysize,
                    bit_depth, gimp_drawable_has_alpha (drawable));
    }

  g_object_unref (buffer);

  gimp_progress_update (0.4);

  encoder = JxlEncoderCreate (NULL);
  if (!encoder)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "Failed to create Jxl encoder");
      g_free (picture_buffer);
      if (profile)
        {
          g_object_unref (profile);
        }
      return FALSE;
    }

  if ( (output_info.bits_per_sample > 12 && (output_info.uses_original_profile || output_info.alpha_bits > 12)) || (metadata && (save_exif || save_xmp)))
    {
      output_info.have_container = JXL_TRUE;
      JxlEncoderUseContainer (encoder, JXL_TRUE);

      if (output_info.bits_per_sample > 12 && (output_info.uses_original_profile || output_info.alpha_bits > 12))
        {
          JxlEncoderSetCodestreamLevel (encoder, 10);
        }

      if (metadata && (save_exif || save_xmp))
        {
          JxlEncoderUseBoxes (encoder);
        }
    }

  runner = JxlThreadParallelRunnerCreate (NULL, gimp_get_num_processors ());
  if (JxlEncoderSetParallelRunner (encoder, JxlThreadParallelRunner, runner) != JXL_ENC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "JxlEncoderSetParallelRunner failed");
      JxlThreadParallelRunnerDestroy (runner);
      JxlEncoderDestroy (encoder);
      g_free (picture_buffer);
      if (profile)
        {
          g_object_unref (profile);
        }
      return FALSE;
    }

  status = JxlEncoderSetBasicInfo (encoder, &output_info);
  if (status != JXL_ENC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "JxlEncoderSetBasicInfo failed!");
      JxlThreadParallelRunnerDestroy (runner);
      JxlEncoderDestroy (encoder);
      g_free (picture_buffer);
      if (profile)
        {
          g_object_unref (profile);
        }
      return FALSE;
    }

  if (profile)
    {
      const uint8_t *icc_data = NULL;
      size_t         icc_length = 0;

      icc_data = gimp_color_profile_get_icc_profile (profile, &icc_length);
      status = JxlEncoderSetICCProfile (encoder, icc_data, icc_length);
      g_object_unref (profile);
      profile = NULL;

      if (status != JXL_ENC_SUCCESS)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "JxlEncoderSetICCProfile failed!");
          JxlThreadParallelRunnerDestroy (runner);
          JxlEncoderDestroy (encoder);
          g_free (picture_buffer);
          return FALSE;
        }
    }
  else
    {
      status = JxlEncoderSetColorEncoding (encoder, &color_profile);
      if (status != JXL_ENC_SUCCESS)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "JxlEncoderSetColorEncoding failed!");
          JxlThreadParallelRunnerDestroy (runner);
          JxlEncoderDestroy (encoder);
          g_free (picture_buffer);
          return FALSE;
        }
    }

  encoder_options = JxlEncoderFrameSettingsCreate (encoder, NULL);

  if (lossless)
    {
      JxlEncoderSetFrameDistance (encoder_options, 0);
      JxlEncoderSetFrameLossless (encoder_options, JXL_TRUE);
    }
  else
    {
      JxlEncoderSetFrameDistance (encoder_options, compression);
      JxlEncoderSetFrameLossless (encoder_options, JXL_FALSE);
    }

  status = JxlEncoderFrameSettingsSetOption (encoder_options, JXL_ENC_FRAME_SETTING_EFFORT, speed);
  if (status != JXL_ENC_SUCCESS)
    {
      g_printerr ("JxlEncoderFrameSettingsSetOption failed to set effort %d", speed);
    }

  gimp_progress_update (0.5);

  status = JxlEncoderAddImageFrame (encoder_options, &pixel_format,
                                    (cmyk) ? cmy_buffer : picture_buffer,
                                    buffer_size);
  if (status != JXL_ENC_SUCCESS)
    {
      g_set_error (error, G_FILE_ERROR, 0,
                   "JxlEncoderAddImageFrame failed!");
      JxlThreadParallelRunnerDestroy (runner);
      JxlEncoderDestroy (encoder);
      g_free (picture_buffer);
      return FALSE;
    }

  if (cmyk)
    {
      JxlExtraChannelInfo extra;
      JxlExtraChannelInfo extra_alpha;

      JxlEncoderInitExtraChannelInfo (JXL_CHANNEL_BLACK, &extra);

      extra.bits_per_sample = output_info.bits_per_sample;
      extra.exponent_bits_per_sample = output_info.exponent_bits_per_sample;

      /* Key Channel */
      status = JxlEncoderSetExtraChannelInfo (encoder, 0, &extra);
      if (status != JXL_ENC_SUCCESS)
        g_printerr ("JxlEncoderSetExtraChannelInfo failed");

      status = JxlEncoderSetExtraChannelBuffer (encoder_options, &pixel_format,
                                                key_buffer, channel_buffer_size,
                                                0);
      if (status != JXL_ENC_SUCCESS)
        g_printerr ("JxlEncoderSetExtraChannelBuffer failed");

      if (alpha_buffer)
        {
          /* Alpha Channel */
          JxlEncoderInitExtraChannelInfo (JXL_CHANNEL_ALPHA, &extra_alpha);

          extra_alpha.bits_per_sample = output_info.bits_per_sample;
          extra_alpha.exponent_bits_per_sample = output_info.exponent_bits_per_sample;

          status = JxlEncoderSetExtraChannelInfo (encoder, 1, &extra_alpha);
          if (status != JXL_ENC_SUCCESS)
            g_printerr ("JxlEncoderSetExtraChannelInfo failed");

          status = JxlEncoderSetExtraChannelBuffer (encoder_options,
                                                    &pixel_format,
                                                    alpha_buffer,
                                                    channel_buffer_size, 1);
          if (status != JXL_ENC_SUCCESS)
            g_printerr ("JxlEncoderSetExtraChannelBuffer failed");

          g_free (alpha_buffer);
        }

      g_free (key_buffer);
    }

  gimp_progress_update (0.65);

  if (metadata && (save_exif || save_xmp))
    {
      GimpMetadata         *filtered_metadata;
      GimpMetadataSaveFlags metadata_flags = 0;

      if (save_exif)
        {
          metadata_flags |= GIMP_METADATA_SAVE_EXIF;
        }

      if (save_xmp)
        {
          metadata_flags |= GIMP_METADATA_SAVE_XMP;
        }

      filtered_metadata = gimp_image_metadata_save_filter (image, "image/jxl", metadata, metadata_flags, NULL, error);
      if (! filtered_metadata)
        {
          if (error && *error)
            {
              g_printerr ("%s: error filtering metadata: %s",
                          G_STRFUNC, (*error)->message);
              g_clear_error (error);
            }
        }
      else
        {
          GExiv2Metadata *filtered_g2metadata = GEXIV2_METADATA (filtered_metadata);

          /*  EXIF metadata  */
          if (save_exif && gexiv2_metadata_has_exif (filtered_g2metadata))
            {
              GBytes *raw_exif_data;

              raw_exif_data = gexiv2_metadata_get_exif_data (filtered_g2metadata, GEXIV2_BYTE_ORDER_LITTLE, error);
              if (raw_exif_data)
                {
                  gsize exif_size = 0;
                  gconstpointer exif_buffer = g_bytes_get_data (raw_exif_data, &exif_size);

                  if (exif_size >= 4)
                    {
                      const JxlBoxType exif_box_type = { 'E', 'x', 'i', 'f' };
                      uint8_t         *content = g_new (uint8_t, exif_size + 4);

                      content[0] = 0;
                      content[1] = 0;
                      content[2] = 0;
                      content[3] = 0;
                      memcpy (content + 4, exif_buffer, exif_size);

                      if (JxlEncoderAddBox (encoder, exif_box_type, content, exif_size + 4, JXL_FALSE) != JXL_ENC_SUCCESS)
                        {
                          g_printerr ("%s: Failed to save EXIF metadata.\n", G_STRFUNC);
                        }

                      g_free (content);
                    }
                  g_bytes_unref (raw_exif_data);
                }
              else
                {
                  if (error && *error)
                    {
                      g_printerr ("%s: error preparing EXIF metadata: %s",
                                  G_STRFUNC, (*error)->message);
                      g_clear_error (error);
                    }
                }
            }

          /*  XMP metadata  */
          if (save_xmp && gexiv2_metadata_has_xmp (filtered_g2metadata))
            {
              gchar *xmp_packet;

              xmp_packet = gexiv2_metadata_try_generate_xmp_packet (filtered_g2metadata, GEXIV2_USE_COMPACT_FORMAT | GEXIV2_OMIT_ALL_FORMATTING, 0, NULL);
              if (xmp_packet)
                {
                  int xmp_size = strlen (xmp_packet);
                  if (xmp_size > 0)
                    {
                      const JxlBoxType xml_box_type = { 'x', 'm', 'l', ' ' };
                      if (JxlEncoderAddBox (encoder, xml_box_type, (const uint8_t *) xmp_packet, xmp_size, JXL_FALSE) != JXL_ENC_SUCCESS)
                        {
                          g_printerr ("%s: Failed to save XMP metadata.\n", G_STRFUNC);
                        }
                    }
                  g_free (xmp_packet);
                }
            }

          g_object_unref (filtered_metadata);
        }
    }

  JxlEncoderCloseInput (encoder);

  gimp_progress_update (0.7);

  compressed = g_byte_array_sized_new (4096);
  g_byte_array_set_size (compressed, 4096);
  do
    {
      next_out = compressed->data + offset;
      avail_out = compressed->len - offset;
      status = JxlEncoderProcessOutput (encoder, &next_out, &avail_out);

      if (status == JXL_ENC_NEED_MORE_OUTPUT)
        {
          offset = next_out - compressed->data;
          g_byte_array_set_size (compressed, compressed->len * 2);
        }
      else if (status == JXL_ENC_ERROR)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "JxlEncoderProcessOutput failed!");
          JxlThreadParallelRunnerDestroy (runner);
          JxlEncoderDestroy (encoder);
          g_free (picture_buffer);
          return FALSE;
        }
    }
  while (status != JXL_ENC_SUCCESS);

  JxlThreadParallelRunnerDestroy (runner);
  JxlEncoderDestroy (encoder);

  g_free (picture_buffer);

  g_byte_array_set_size (compressed, next_out - compressed->data);

  gimp_progress_update (0.8);

  if (compressed->len > 0)
    {
      outfile = g_fopen (g_file_peek_path (file), "wb");
      if (!outfile)
        {
          g_set_error (error, G_FILE_ERROR, 0,
                       "Could not open '%s' for writing!\n",
                       g_file_peek_path (file));
          g_byte_array_free (compressed, TRUE);
          return FALSE;
        }

      fwrite (compressed->data, 1, compressed->len, outfile);
      fclose (outfile);

      gimp_progress_update (1.0);

      g_byte_array_free (compressed, TRUE);
      return TRUE;
    }

  g_set_error (error, G_FILE_ERROR, 0,
               "No data to write");
  g_byte_array_free (compressed, TRUE);
  return FALSE;
}

static gboolean
save_dialog (GimpImage     *image,
             GimpProcedure *procedure,
             GObject       *config)
{
  GtkWidget        *dialog;
  GtkListStore     *store;
  GtkWidget        *compression_scale;
  GtkWidget        *profile_label;
  GimpColorProfile *cmyk_profile = NULL;
  gboolean          run;

  dialog = gimp_export_procedure_dialog_new (GIMP_EXPORT_PROCEDURE (procedure),
                                             GIMP_PROCEDURE_CONFIG (config),
                                             image);

  gimp_procedure_dialog_get_widget (GIMP_PROCEDURE_DIALOG (dialog),
                                    "lossless", GTK_TYPE_CHECK_BUTTON);

  compression_scale = gimp_procedure_dialog_get_widget (GIMP_PROCEDURE_DIALOG (dialog),
                                                        "compression",
                                                        GIMP_TYPE_SCALE_ENTRY);

  g_object_bind_property (config,            "lossless",
                          compression_scale, "sensitive",
                          G_BINDING_SYNC_CREATE |
                          G_BINDING_INVERT_BOOLEAN);


  gimp_procedure_dialog_get_widget (GIMP_PROCEDURE_DIALOG (dialog),
                                    "speed", GIMP_TYPE_SPIN_SCALE);

  store = gimp_int_store_new (_("8 bit/channel"),   8,
                              _("16 bit/channel"), 16,
                              NULL);

  gimp_procedure_dialog_get_int_combo (GIMP_PROCEDURE_DIALOG (dialog),
                                       "save-bit-depth", GIMP_INT_STORE (store));

  /* Profile label */
  profile_label = gimp_procedure_dialog_get_label (GIMP_PROCEDURE_DIALOG (dialog),
                                                   "profile-label", _("CMYK profile required for export"),
                                                   FALSE, FALSE);
  gtk_label_set_xalign (GTK_LABEL (profile_label), 0.0);
  gtk_label_set_ellipsize (GTK_LABEL (profile_label), PANGO_ELLIPSIZE_END);
  gimp_label_set_attributes (GTK_LABEL (profile_label),
                             PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
                             -1);
  gimp_help_set_help_data (profile_label,
                           _("Name of the color profile used for CMYK export."), NULL);
  gimp_procedure_dialog_fill_frame (GIMP_PROCEDURE_DIALOG (dialog),
                                    "cmyk-frame", "cmyk", FALSE,
                                    "profile-label");
  cmyk_profile = gimp_image_get_simulation_profile (image);

  if (! cmyk_profile)
    {
      g_object_set (config,
                    "cmyk", FALSE,
                    NULL);
    }

  if (cmyk_profile)
    {
      if (gimp_color_profile_is_cmyk (cmyk_profile))
        {
          gchar *label_text;

          label_text = g_strdup_printf (_("Profile: %s"),
                                        gimp_color_profile_get_label (cmyk_profile));
          gtk_label_set_text (GTK_LABEL (profile_label), label_text);
          gimp_label_set_attributes (GTK_LABEL (profile_label),
                                     PANGO_ATTR_STYLE, PANGO_STYLE_NORMAL,
                                     -1);
          g_free (label_text);
        }
      g_object_unref (cmyk_profile);
    }

  /* JPEG XL requires a CMYK profile if exporting as CMYK */
  gimp_procedure_dialog_set_sensitive (GIMP_PROCEDURE_DIALOG (dialog),
                                       "cmyk",
                                       cmyk_profile != NULL,
                                       NULL, NULL, FALSE);

  gimp_procedure_dialog_fill (GIMP_PROCEDURE_DIALOG (dialog),
                              "lossless", "compression",
                              "speed", "save-bit-depth",
                              "cmyk-frame",
                              "include-exif", "include-xmp",
                              NULL);

  run = gimp_procedure_dialog_run (GIMP_PROCEDURE_DIALOG (dialog));

  gtk_widget_destroy (dialog);

  return run;
}


static GimpValueArray *
jpegxl_export (GimpProcedure        *procedure,
               GimpRunMode           run_mode,
               GimpImage            *image,
               GFile                *file,
               GimpExportOptions    *options,
               GimpMetadata         *metadata,
               GimpProcedureConfig  *config,
               gpointer              run_data)
{
  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
  GimpExportReturn   export = GIMP_EXPORT_IGNORE;
  GList             *drawables;
  GError            *error  = NULL;

  gegl_init (NULL, NULL);

  if (run_mode == GIMP_RUN_INTERACTIVE)
    {
      gimp_ui_init (PLUG_IN_BINARY);

      if (! save_dialog (image, procedure, G_OBJECT (config)))
        {
          status = GIMP_PDB_CANCEL;
        }
    }

  export = gimp_export_options_get_image (options, &image);
  drawables = gimp_image_list_layers (image);

  if (status == GIMP_PDB_SUCCESS)
    {
      GimpMetadataSaveFlags metadata_flags;

      GimpMetadata *metadata = gimp_image_metadata_save_prepare (image, "image/jxl", &metadata_flags);

      if (! export_image (file, config, image, drawables->data, metadata, &error))
        {
          status = GIMP_PDB_EXECUTION_ERROR;
        }

      if (metadata)
        {
          g_object_unref (metadata);
        }
    }

  if (export == GIMP_EXPORT_EXPORT)
    gimp_image_delete (image);

  g_list_free (drawables);
  return gimp_procedure_new_return_values (procedure, status, error);
}