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xcf-save.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <stdio.h>
#include <string.h> /* strcpy, strlen */

#include <glib-object.h>

#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"

#include "core/core-types.h"

#include "base/tile.h"
#include "base/tile-manager.h"
#include "base/tile-manager-private.h"

#include "core/gimpchannel.h"
#include "core/gimpdrawable.h"
#include "core/gimpgrid.h"
#include "core/gimpimage.h"
#include "core/gimpimage-grid.h"
#include "core/gimpimage-guides.h"
#include "core/gimplayer.h"
#include "core/gimplayer-floating-sel.h"
#include "core/gimplayermask.h"
#include "core/gimplist.h"
#include "core/gimpparasitelist.h"
#include "core/gimpunit.h"

#include "text/gimptextlayer.h"
#include "text/gimptextlayer-xcf.h"

#include "vectors/gimpanchor.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpbezierstroke.h"
#include "vectors/gimpvectors.h"
#include "vectors/gimpvectors-compat.h"

#include "xcf-private.h"
#include "xcf-read.h"
#include "xcf-seek.h"
#include "xcf-write.h"

#include "gimp-intl.h"


static gboolean xcf_save_image_props   (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GError           **error);
static gboolean xcf_save_layer_props   (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GimpLayer         *layer,
                                        GError           **error);
static gboolean xcf_save_channel_props (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GimpChannel       *channel,
                                        GError           **error);
static gboolean xcf_save_prop          (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        PropType           prop_type,
                                        GError           **error,
                                        ...);
static gboolean xcf_save_layer         (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GimpLayer         *layer,
                                        GError           **error);
static gboolean xcf_save_channel       (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GimpChannel       *channel,
                                        GError           **error);
static gboolean xcf_save_hierarchy     (XcfInfo           *info,
                                        TileManager       *tiles,
                                        GError           **error);
static gboolean xcf_save_level         (XcfInfo           *info,
                                        TileManager       *tiles,
                                        GError           **error);
static gboolean xcf_save_tile          (XcfInfo           *info,
                                        Tile              *tile,
                                        GError           **error);
static gboolean xcf_save_tile_rle      (XcfInfo           *info,
                                        Tile              *tile,
                                        guchar            *rlebuf,
                                        GError           **error);
static gboolean xcf_save_parasite      (XcfInfo           *info,
                                        GimpParasite      *parasite,
                                        GError           **error);
static gboolean xcf_save_parasite_list (XcfInfo           *info,
                                        GimpParasiteList  *parasite,
                                        GError           **error);
static gboolean xcf_save_old_paths     (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GError           **error);
static gboolean xcf_save_vectors       (XcfInfo           *info,
                                        GimpImage         *gimage,
                                        GError           **error);


/* private convenience macros */
#define xcf_write_int32_check_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_int32 (info->fp, data, count, &tmp_error); \
  if (tmp_error)                                                   \
    {                                                              \
      g_propagate_error (error, tmp_error);                        \
      return FALSE;                                                \
    }                                                              \
  } G_STMT_END

#define xcf_write_int8_check_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_int8 (info->fp, data, count, &tmp_error); \
  if (tmp_error)                                                  \
    {                                                             \
      g_propagate_error (error, tmp_error);                       \
      return FALSE;                                               \
    }                                                             \
  } G_STMT_END

#define xcf_write_float_check_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_float (info->fp, data, count, &tmp_error); \
  if (tmp_error)                                                   \
    {                                                              \
      g_propagate_error (error, tmp_error);                        \
      return FALSE;                                                \
    }                                                              \
  } G_STMT_END

#define xcf_write_string_check_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_string (info->fp, data, count, &tmp_error); \
  if (tmp_error)                                                    \
    {                                                               \
      g_propagate_error (error, tmp_error);                         \
      return FALSE;                                                 \
    }                                                               \
  } G_STMT_END

#define xcf_write_int32_print_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_int32 (info->fp, data, count, &error); \
  if (error)                                                   \
    {                                                          \
      g_message (_("Error saving XCF file: %s"),               \
                 error->message);                              \
      return FALSE;                                            \
    }                                                          \
  } G_STMT_END

#define xcf_write_int8_print_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_int8 (info->fp, data, count, &error); \
  if (error)                                                  \
    {                                                         \
      g_message (_("Error saving XCF file: %s"),              \
                 error->message);                             \
      return FALSE;                                           \
    }                                                         \
  } G_STMT_END

#define xcf_write_float_print_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_float (info->fp, data, count, &error); \
  if (error)                                                   \
    {                                                          \
      g_message (_("Error saving XCF file: %s"),               \
                 error->message);                              \
      return FALSE;                                            \
    }                                                          \
  } G_STMT_END

#define xcf_write_string_print_error(info, data, count) G_STMT_START { \
  info->cp += xcf_write_string (info->fp, data, count, &error); \
  if (error)                                                    \
    {                                                           \
      g_message (_("Error saving XCF file: %s"),                \
                 error->message);                               \
      return FALSE;                                             \
    }                                                           \
  } G_STMT_END

#define xcf_write_prop_type_check_error(info, prop_type) G_STMT_START { \
  guint32 _prop_int32 = prop_type;                     \
  xcf_write_int32_check_error (info, &_prop_int32, 1); \
  } G_STMT_END

#define xcf_write_prop_type_print_error(info, prop_type) G_STMT_START { \
  guint32 _prop_int32 = prop_type;                     \
  xcf_write_int32_print_error (info, &_prop_int32, 1); \
  } G_STMT_END

#define xcf_check_error(x) G_STMT_START { \
  if (! (x))                                                  \
    return FALSE;                                             \
  } G_STMT_END

#define xcf_print_error(x) G_STMT_START { \
  if (! (x))                                                  \
    {                                                         \
      g_message (_("Error saving XCF file: %s"),              \
                 error->message);                             \
      return FALSE;                                           \
    }                                                         \
  } G_STMT_END


void
xcf_save_choose_format (XcfInfo   *info,
                        GimpImage *gimage)
{
  GimpLayer *layer;
  GList     *list;

  gint save_version = 0;                /* default to oldest */

  if (gimage->cmap)
    save_version = 1;                   /* need version 1 for colormaps */

  for (list = GIMP_LIST (gimage->layers)->list;
       list && save_version < 2;
       list = g_list_next (list))
    {
      layer = GIMP_LAYER (list->data);

      switch (layer->mode)
        {
          /* new layer modes not supported by gimp-1.2 */
        case GIMP_SOFTLIGHT_MODE:
        case GIMP_GRAIN_EXTRACT_MODE:
        case GIMP_GRAIN_MERGE_MODE:
        case GIMP_COLOR_ERASE_MODE:
          save_version = 2;
          break;

        default:
          break;
        }
    }

  info->file_version = save_version;
}

gint
xcf_save_image (XcfInfo   *info,
            GimpImage *gimage)
{
  GimpLayer   *layer;
  GimpLayer   *floating_layer;
  GimpChannel *channel;
  guint32      saved_pos;
  guint32      offset;
  guint        nlayers;
  guint        nchannels;
  GList       *list;
  gboolean     have_selection;
  gint         t1, t2, t3, t4;
  gchar        version_tag[14];
  GError      *error = NULL;

  floating_layer = gimp_image_floating_sel (gimage);
  if (floating_layer)
    floating_sel_relax (floating_layer, FALSE);

  /* write out the tag information for the image */
  if (info->file_version > 0)
    {
      sprintf (version_tag, "gimp xcf v%03d", info->file_version);
    }
  else
    {
      strcpy (version_tag, "gimp xcf file");
    }
  xcf_write_int8_print_error  (info, (guint8 *) version_tag, 14);

  /* write out the width, height and image type information for the image */
  xcf_write_int32_print_error (info, (guint32 *) &gimage->width, 1);
  xcf_write_int32_print_error (info, (guint32 *) &gimage->height, 1);
  xcf_write_int32_print_error (info, (guint32 *) &gimage->base_type, 1);

  /* determine the number of layers and channels in the image */
  nlayers   = (guint) gimp_container_num_children (gimage->layers);
  nchannels = (guint) gimp_container_num_children (gimage->channels);

  /* check and see if we have to save out the selection */
  have_selection = gimp_channel_bounds (gimp_image_get_mask (gimage),
                                        &t1, &t2, &t3, &t4);
  if (have_selection)
    nchannels += 1;

  /* write the property information for the image.
   */

  xcf_print_error (xcf_save_image_props (info, gimage, &error));

  /* save the current file position as it is the start of where
   *  we place the layer offset information.
   */
  saved_pos = info->cp;

  /* seek to after the offset lists */
  xcf_print_error (xcf_seek_pos (info,
                                 info->cp + (nlayers + nchannels + 2) * 4,
                                 &error));

  for (list = GIMP_LIST (gimage->layers)->list;
       list;
       list = g_list_next (list))
    {
      layer = (GimpLayer *) list->data;

      /* save the start offset of where we are writing
       *  out the next layer.
       */
      offset = info->cp;

      /* write out the layer. */
      xcf_print_error (xcf_save_layer (info, gimage, layer, &error));

      /* seek back to where we are to write out the next
       *  layer offset and write it out.
       */
      xcf_print_error (xcf_seek_pos (info, saved_pos, &error));
      xcf_write_int32_print_error (info, &offset, 1);

      /* increment the location we are to write out the
       *  next offset.
       */
      saved_pos = info->cp;

      /* seek to the end of the file which is where
       *  we will write out the next layer.
       */
      xcf_print_error (xcf_seek_end (info, &error));
    }

  /* write out a '0' offset position to indicate the end
   *  of the layer offsets.
   */
  offset = 0;
  xcf_print_error (xcf_seek_pos (info, saved_pos, &error));
  xcf_write_int32_print_error (info, &offset, 1);
  saved_pos = info->cp;
  xcf_print_error (xcf_seek_end (info, &error));

  list = GIMP_LIST (gimage->channels)->list;

  while (list || have_selection)
    {
      if (list)
      {
        channel = (GimpChannel *) list->data;

        list = g_list_next (list);
      }
      else
      {
        channel = gimage->selection_mask;
        have_selection = FALSE;
      }

      /* save the start offset of where we are writing
       *  out the next channel.
       */
      offset = info->cp;

      /* write out the layer. */
      xcf_print_error (xcf_save_channel (info, gimage, channel, &error));

      /* seek back to where we are to write out the next
       *  channel offset and write it out.
       */
      xcf_print_error (xcf_seek_pos (info, saved_pos, &error));
      xcf_write_int32_print_error (info, &offset, 1);

      /* increment the location we are to write out the
       *  next offset.
       */
      saved_pos = info->cp;

      /* seek to the end of the file which is where
       *  we will write out the next channel.
       */
      xcf_print_error (xcf_seek_end (info, &error));
    }

  /* write out a '0' offset position to indicate the end
   *  of the channel offsets.
   */
  offset = 0;
  xcf_print_error (xcf_seek_pos (info, saved_pos, &error));
  xcf_write_int32_print_error (info, &offset, 1);
  saved_pos = info->cp;

  if (floating_layer)
    floating_sel_rigor (floating_layer, FALSE);

  return !ferror(info->fp);
}

static gboolean
xcf_save_image_props (XcfInfo   *info,
                  GimpImage *gimage,
                  GError   **error)
{
  GimpParasite *parasite = NULL;
  GimpUnit      unit     = gimp_image_get_unit (gimage);

  /* check and see if we should save the colormap property */
  if (gimage->cmap)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_COLORMAP, error,
                                    gimage->num_cols, gimage->cmap));

  if (info->compression != COMPRESS_NONE)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_COMPRESSION,
                                    error, info->compression));

  if (gimage->guides)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_GUIDES,
                                    error, gimage->guides));

  xcf_check_error (xcf_save_prop (info, gimage, PROP_RESOLUTION, error,
                              gimage->xresolution, gimage->yresolution));

  xcf_check_error (xcf_save_prop (info, gimage, PROP_TATTOO, error,
                                  gimage->tattoo_state));

  if (gimp_parasite_list_length (gimage->parasites) > 0)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_PARASITES,
                                    error, gimage->parasites));

  if (unit < _gimp_unit_get_number_of_built_in_units (gimage->gimp))
    xcf_check_error (xcf_save_prop (info, gimage, PROP_UNIT, error, unit));

  if (gimp_container_num_children (gimage->vectors) > 0)
    {
      if (gimp_vectors_compat_is_compatible (gimage))
        xcf_check_error (xcf_save_prop (info, gimage, PROP_PATHS, error));
      else
        xcf_check_error (xcf_save_prop (info, gimage, PROP_VECTORS, error));
    }

  if (unit >= _gimp_unit_get_number_of_built_in_units (gimage->gimp))
    xcf_check_error (xcf_save_prop (info, gimage, PROP_USER_UNIT, error, unit));

  if (GIMP_IS_GRID (gimage->grid))
    {
      GimpGrid *grid = gimp_image_get_grid (gimage);

      parasite = gimp_grid_to_parasite (grid);
      gimp_parasite_list_add (GIMP_IMAGE (gimage)->parasites, parasite);
    }

  if (gimp_parasite_list_length (GIMP_IMAGE (gimage)->parasites) > 0)
    {
      xcf_check_error (xcf_save_prop (info, gimage, PROP_PARASITES, error,
                                      GIMP_IMAGE (gimage)->parasites));
    }

  if (parasite)
    {
      gimp_parasite_list_remove (GIMP_IMAGE (gimage)->parasites,
                                 gimp_parasite_name (parasite));
      gimp_parasite_free (parasite);
    }

  xcf_check_error (xcf_save_prop (info, gimage, PROP_END, error));

  return TRUE;
}

static gboolean
xcf_save_layer_props (XcfInfo   *info,
                  GimpImage *gimage,
                  GimpLayer *layer,
                  GError   **error)
{
  GimpParasite *parasite = NULL;

  if (layer == gimp_image_get_active_layer (gimage))
    xcf_check_error (xcf_save_prop (info, gimage, PROP_ACTIVE_LAYER, error));

  if (layer == gimp_image_floating_sel (gimage))
    {
      info->floating_sel_drawable = layer->fs.drawable;
      xcf_check_error (xcf_save_prop (info, gimage, PROP_FLOATING_SELECTION,
                                      error));
    }

  xcf_check_error (xcf_save_prop (info, gimage, PROP_OPACITY, error,
                                  layer->opacity));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_VISIBLE, error,
                              gimp_item_get_visible (GIMP_ITEM (layer))));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_LINKED, error,
                                  gimp_item_get_linked (GIMP_ITEM (layer))));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_PRESERVE_TRANSPARENCY,
                                  error, layer->preserve_trans));

  if (layer->mask)
    {
      xcf_check_error (xcf_save_prop (info, gimage, PROP_APPLY_MASK,
                                      error, layer->mask->apply_mask));
      xcf_check_error (xcf_save_prop (info, gimage, PROP_EDIT_MASK,
                                      error, layer->mask->edit_mask));
      xcf_check_error (xcf_save_prop (info, gimage, PROP_SHOW_MASK,
                                      error, layer->mask->show_mask));
    }
  else
    {
      xcf_check_error (xcf_save_prop (info, gimage, PROP_APPLY_MASK,
                                      error, FALSE));
      xcf_check_error (xcf_save_prop (info, gimage, PROP_EDIT_MASK,
                                      error, FALSE));
      xcf_check_error (xcf_save_prop (info, gimage, PROP_SHOW_MASK,
                                      error, FALSE));
    }

  xcf_check_error (xcf_save_prop (info, gimage, PROP_OFFSETS, error,
                              GIMP_ITEM (layer)->offset_x,
                              GIMP_ITEM (layer)->offset_y));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_MODE, error,
                                  layer->mode));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_TATTOO, error,
                                  GIMP_ITEM (layer)->tattoo));

  if (GIMP_IS_TEXT_LAYER (layer) && GIMP_TEXT_LAYER (layer)->text)
    {
      GimpTextLayer *text_layer = GIMP_TEXT_LAYER (layer);
      guint32        flags      = gimp_text_layer_get_xcf_flags (text_layer);

      gimp_text_layer_xcf_save_prepare (text_layer);

      if (flags)
        xcf_check_error (xcf_save_prop (info,
                                        gimage, PROP_TEXT_LAYER_FLAGS, error,
                                        flags));
    }

  if (gimp_parasite_list_length (GIMP_ITEM (layer)->parasites) > 0)
    {
      xcf_check_error (xcf_save_prop (info, gimage, PROP_PARASITES, error,
                                      GIMP_ITEM (layer)->parasites));
    }

  if (parasite)
    {
      gimp_parasite_list_remove (GIMP_ITEM (layer)->parasites,
                                 gimp_parasite_name (parasite));
      gimp_parasite_free (parasite);
    }

  xcf_check_error (xcf_save_prop (info, gimage, PROP_END, error));

  return TRUE;
}

static gboolean
xcf_save_channel_props (XcfInfo     *info,
                  GimpImage   *gimage,
                  GimpChannel *channel,
                  GError     **error)
{
  guchar col[3];

  if (channel == gimp_image_get_active_channel (gimage))
    xcf_check_error (xcf_save_prop (info, gimage, PROP_ACTIVE_CHANNEL, error));

  if (channel == gimage->selection_mask)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_SELECTION, error));

  xcf_check_error (xcf_save_prop (info, gimage, PROP_OPACITY, error,
                                  channel->color.a));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_VISIBLE, error,
                              gimp_item_get_visible (GIMP_ITEM (channel))));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_LINKED, error,
                                  gimp_item_get_linked (GIMP_ITEM (channel))));
  xcf_check_error (xcf_save_prop (info, gimage, PROP_SHOW_MASKED, error,
                                  channel->show_masked));

  gimp_rgb_get_uchar (&channel->color, &col[0], &col[1], &col[2]);
  xcf_check_error (xcf_save_prop (info, gimage, PROP_COLOR, error, col));

  xcf_check_error (xcf_save_prop (info, gimage, PROP_TATTOO, error,
                   GIMP_ITEM (channel)->tattoo));

  if (gimp_parasite_list_length (GIMP_ITEM (channel)->parasites) > 0)
    xcf_check_error (xcf_save_prop (info, gimage, PROP_PARASITES, error,
                 GIMP_ITEM (channel)->parasites));

  xcf_check_error (xcf_save_prop (info, gimage, PROP_END, error));

  return TRUE;
}

static gboolean
xcf_save_prop (XcfInfo   *info,
             GimpImage *gimage,
             PropType   prop_type,
             GError   **error,
             ...)
{
  guint32 size;
  va_list args;

  GError *tmp_error = NULL;

  va_start (args, error);

  switch (prop_type)
    {
    case PROP_END:
      size = 0;

      xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      break;

    case PROP_COLORMAP:
      {
      guint32  ncolors;
      guchar  *colors;

      ncolors = va_arg (args, guint32);
      colors = va_arg (args, guchar*);
      size = 4 + ncolors * 3;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &ncolors, 1);
      xcf_write_int8_check_error  (info, colors, ncolors * 3);
      }
      break;

    case PROP_ACTIVE_LAYER:
    case PROP_ACTIVE_CHANNEL:
    case PROP_SELECTION:
      size = 0;

      xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      break;

    case PROP_FLOATING_SELECTION:
      {
      guint32 dummy;

      dummy = 0;
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      info->floating_sel_offset = info->cp;
      xcf_write_int32_check_error (info, &dummy, 1);
      }
      break;

    case PROP_OPACITY:
      {
      gdouble opacity;
        guint32 uint_opacity;

      opacity = va_arg (args, gdouble);

        uint_opacity = opacity * 255.999;

      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &uint_opacity, 1);
      }
      break;

    case PROP_MODE:
      {
      gint32 mode;

      mode = va_arg (args, gint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, (guint32 *) &mode, 1);
      }
      break;

    case PROP_VISIBLE:
      {
      guint32 visible;

      visible = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &visible, 1);
      }
      break;

    case PROP_LINKED:
      {
      guint32 linked;

      linked = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &linked, 1);
      }
      break;

    case PROP_PRESERVE_TRANSPARENCY:
      {
      guint32 preserve_trans;

      preserve_trans = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &preserve_trans, 1);
      }
      break;

    case PROP_APPLY_MASK:
      {
      guint32 apply_mask;

      apply_mask = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &apply_mask, 1);
      }
      break;

    case PROP_EDIT_MASK:
      {
      guint32 edit_mask;

      edit_mask = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &edit_mask, 1);
      }
      break;

    case PROP_SHOW_MASK:
      {
      guint32 show_mask;

      show_mask = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &show_mask, 1);
      }
      break;

    case PROP_SHOW_MASKED:
      {
      guint32 show_masked;

      show_masked = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &show_masked, 1);
      }
      break;

    case PROP_OFFSETS:
      {
      gint32 offsets[2];

      offsets[0] = va_arg (args, gint32);
      offsets[1] = va_arg (args, gint32);
      size = 8;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, (guint32 *) offsets, 2);
      }
      break;

    case PROP_COLOR:
      {
      guchar *color;

      color = va_arg (args, guchar*);
      size = 3;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int8_check_error  (info, color, 3);
      }
      break;

    case PROP_COMPRESSION:
      {
      guint8 compression;

      compression = (guint8) va_arg (args, guint32);
      size = 1;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int8_check_error  (info, &compression, 1);
      }
      break;

    case PROP_GUIDES:
      {
      GList     *guides;
      GimpGuide *guide;
      gint32     position;
      gint8      orientation;
      gint       nguides;

      guides = va_arg (args, GList *);
      nguides = g_list_length (guides);

      size = nguides * (4 + 1);

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);

      for (; guides; guides = g_list_next (guides))
        {
          guide = (GimpGuide *) guides->data;

          position = guide->position;

            switch (guide->orientation)
              {
              case GIMP_ORIENTATION_HORIZONTAL:
                orientation = XCF_ORIENTATION_HORIZONTAL;
                break;

              case GIMP_ORIENTATION_VERTICAL:
                orientation = XCF_ORIENTATION_VERTICAL;
                break;

              default:
                g_warning ("%s: skipping guide with bad orientation",
                           G_STRFUNC);
                continue;
              }

          xcf_write_int32_check_error (info, (guint32 *) &position,    1);
          xcf_write_int8_check_error  (info, (guint8 *)  &orientation, 1);
        }
      }
      break;

    case PROP_RESOLUTION:
      {
      gfloat xresolution, yresolution;

      /* we pass in floats,
           but they are promoted to double by the compiler */
      xresolution =  va_arg (args, double);
      yresolution =  va_arg (args, double);

      size = 4*2;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);

      xcf_write_float_check_error (info, &xresolution, 1);
      xcf_write_float_check_error (info, &yresolution, 1);
      }
      break;

    case PROP_TATTOO:
      {
      guint32 tattoo;

      tattoo =  va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &tattoo, 1);
      }
      break;

    case PROP_PARASITES:
      {
      GimpParasiteList *list;
      guint32           base, length;
      long              pos;

      list = va_arg (args, GimpParasiteList *);

      if (gimp_parasite_list_persistent_length (list) > 0)
        {
            xcf_write_prop_type_check_error (info, prop_type);

          /* because we don't know how much room the parasite list will take
           * we save the file position and write the length later
           */
            pos = info->cp;
          xcf_write_int32_check_error (info, &length, 1);
          base = info->cp;

            xcf_check_error (xcf_save_parasite_list (info, list, error));

          length = info->cp - base;
          /* go back to the saved position and write the length */
            xcf_check_error (xcf_seek_pos (info, pos, error));
          xcf_write_int32 (info->fp, &length, 1, &tmp_error);
          if (tmp_error)
            {
              g_propagate_error (error, tmp_error);
              return FALSE;
            }

            xcf_check_error (xcf_seek_end (info, error));
        }
      }
      break;

    case PROP_UNIT:
      {
      guint32 unit;

      unit = va_arg (args, guint32);

      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &unit, 1);
      }
      break;

    case PROP_PATHS:
      {
      guint32 base, length;
      glong   pos;

        xcf_write_prop_type_check_error (info, prop_type);

        /* because we don't know how much room the paths list will take
         * we save the file position and write the length later
         */
        pos = info->cp;
        xcf_write_int32_check_error (info, &length, 1);

        base = info->cp;

        xcf_check_error (xcf_save_old_paths (info, gimage, error));

        length = info->cp - base;

        /* go back to the saved position and write the length */
        xcf_check_error (xcf_seek_pos (info, pos, error));
        xcf_write_int32 (info->fp, &length, 1, &tmp_error);
        if (tmp_error)
          {
            g_propagate_error (error, tmp_error);
            return FALSE;
          }

        xcf_check_error (xcf_seek_end (info, error));
      }
      break;

    case PROP_USER_UNIT:
      {
      GimpUnit     unit;
      const gchar *unit_strings[5];
      gfloat       factor;
      guint32      digits;

      unit = va_arg (args, guint32);

      /* write the entire unit definition */
      unit_strings[0] = _gimp_unit_get_identifier (gimage->gimp, unit);
      factor          = _gimp_unit_get_factor (gimage->gimp, unit);
      digits          = _gimp_unit_get_digits (gimage->gimp, unit);
      unit_strings[1] = _gimp_unit_get_symbol (gimage->gimp, unit);
      unit_strings[2] = _gimp_unit_get_abbreviation (gimage->gimp, unit);
      unit_strings[3] = _gimp_unit_get_singular (gimage->gimp, unit);
      unit_strings[4] = _gimp_unit_get_plural (gimage->gimp, unit);

      size =
        2 * 4 +
        strlen (unit_strings[0]) ? strlen (unit_strings[0]) + 5 : 4 +
        strlen (unit_strings[1]) ? strlen (unit_strings[1]) + 5 : 4 +
        strlen (unit_strings[2]) ? strlen (unit_strings[2]) + 5 : 4 +
        strlen (unit_strings[3]) ? strlen (unit_strings[3]) + 5 : 4 +
        strlen (unit_strings[4]) ? strlen (unit_strings[4]) + 5 : 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_float_check_error (info, &factor, 1);
      xcf_write_int32_check_error (info, &digits, 1);
      xcf_write_string_check_error (info, (gchar **) unit_strings, 5);
      }
      break;

    case PROP_VECTORS:
      {
      guint32 base, length;
      glong   pos;

        xcf_write_prop_type_check_error (info, prop_type);

        /* because we don't know how much room the paths list will take
         * we save the file position and write the length later
         */
        pos = info->cp;
        xcf_write_int32_check_error (info, &length, 1);

        base = info->cp;

        xcf_check_error (xcf_save_vectors (info, gimage, error));

        length = info->cp - base;

        /* go back to the saved position and write the length */
        xcf_check_error (xcf_seek_pos (info, pos, error));
        xcf_write_int32 (info->fp, &length, 1, &tmp_error);
        if (tmp_error)
          {
            g_propagate_error (error, tmp_error);
            return FALSE;
          }

        xcf_check_error (xcf_seek_end (info, error));
      }
      break;

    case PROP_TEXT_LAYER_FLAGS:
      {
      guint32 flags;

      flags = va_arg (args, guint32);
      size = 4;

        xcf_write_prop_type_check_error (info, prop_type);
      xcf_write_int32_check_error (info, &size, 1);
      xcf_write_int32_check_error (info, &flags, 1);
      }
      break;
    }

  va_end (args);

  return TRUE;
}

static gboolean
xcf_save_layer (XcfInfo   *info,
            GimpImage *gimage,
            GimpLayer *layer,
            GError   **error)
{
  guint32 saved_pos;
  guint32 offset;

  GError *tmp_error = NULL;

  /* check and see if this is the drawable that the floating
   *  selection is attached to.
   */
  if (GIMP_DRAWABLE (layer) == info->floating_sel_drawable)
    {
      saved_pos = info->cp;
      xcf_check_error (xcf_seek_pos (info, info->floating_sel_offset, error));
      xcf_write_int32_check_error (info, &saved_pos, 1);
      xcf_check_error (xcf_seek_pos (info, saved_pos, error));
    }

  /* write out the width, height and image type information for the layer */
  xcf_write_int32_check_error (info,
                               (guint32 *) &GIMP_ITEM (layer)->width, 1);
  xcf_write_int32_check_error (info,
                               (guint32 *) &GIMP_ITEM (layer)->height, 1);
  xcf_write_int32_check_error (info,
                               (guint32 *) &GIMP_DRAWABLE (layer)->type, 1);

  /* write out the layers name */
  xcf_write_string_check_error (info, &GIMP_OBJECT (layer)->name, 1);

  /* write out the layer properties */
  xcf_save_layer_props (info, gimage, layer, error);

  /* save the current position which is where the hierarchy offset
   *  will be stored.
   */
  saved_pos = info->cp;

  /* write out the layer tile hierarchy */
  xcf_check_error (xcf_seek_pos (info, info->cp + 8, error));
  offset = info->cp;

  xcf_check_error (xcf_save_hierarchy (info,
                                       GIMP_DRAWABLE(layer)->tiles, error));

  xcf_check_error (xcf_seek_pos (info, saved_pos, error));
  xcf_write_int32_check_error (info, &offset, 1);
  saved_pos = info->cp;

  /* write out the layer mask */
  if (layer->mask)
    {
      xcf_check_error (xcf_seek_end (info, error));
      offset = info->cp;

      xcf_check_error (xcf_save_channel (info,
                                         gimage, GIMP_CHANNEL(layer->mask),
                                         error));
    }
  else
    offset = 0;

  xcf_check_error (xcf_seek_pos (info, saved_pos, error));
  xcf_write_int32_check_error (info, &offset, 1);

  return TRUE;
}

static gboolean
xcf_save_channel (XcfInfo      *info,
              GimpImage    *gimage,
              GimpChannel  *channel,
              GError      **error)
{
  guint32 saved_pos;
  guint32 offset;

  GError *tmp_error = NULL;

  /* check and see if this is the drawable that the floating
   *  selection is attached to.
   */
  if (GIMP_DRAWABLE (channel) == info->floating_sel_drawable)
    {
      saved_pos = info->cp;
      xcf_check_error (xcf_seek_pos (info, info->floating_sel_offset, error));
      xcf_write_int32_check_error (info, &saved_pos, 1);
      xcf_check_error (xcf_seek_pos (info, saved_pos, error));
    }

  /* write out the width and height information for the channel */
  xcf_write_int32_check_error (info,
                               (guint32 *) &GIMP_ITEM (channel)->width, 1);
  xcf_write_int32_check_error (info,
                               (guint32 *) &GIMP_ITEM (channel)->height, 1);

  /* write out the channels name */
  xcf_write_string_check_error (info, &GIMP_OBJECT (channel)->name, 1);

  /* write out the channel properties */
  xcf_save_channel_props (info, gimage, channel, error);

  /* save the current position which is where the hierarchy offset
   *  will be stored.
   */
  saved_pos = info->cp;

  /* write out the channel tile hierarchy */
  xcf_check_error (xcf_seek_pos (info, info->cp + 4, error));
  offset = info->cp;

  xcf_check_error (xcf_save_hierarchy (info,
                                       GIMP_DRAWABLE (channel)->tiles, error));

  xcf_check_error (xcf_seek_pos (info, saved_pos, error));
  xcf_write_int32_check_error (info, &offset, 1);
  saved_pos = info->cp;

  return TRUE;
}

static gint
xcf_calc_levels (gint size,
             gint tile_size)
{
  int levels;

  levels = 1;
  while (size > tile_size)
    {
      size /= 2;
      levels += 1;
    }

  return levels;
}


static gboolean
xcf_save_hierarchy (XcfInfo     *info,
                TileManager *tiles,
                GError     **error)
{
  guint32 saved_pos;
  guint32 offset;
  guint32 width;
  guint32 height;
  guint32 bpp;
  gint    i;
  gint    nlevels;
  gint    tmp1, tmp2;

  GError *tmp_error = NULL;

  width  = tile_manager_width (tiles);
  height = tile_manager_height (tiles);
  bpp    = tile_manager_bpp (tiles);

  xcf_write_int32_check_error (info, (guint32 *) &width, 1);
  xcf_write_int32_check_error (info, (guint32 *) &height, 1);
  xcf_write_int32_check_error (info, (guint32 *) &bpp, 1);

  saved_pos = info->cp;

  tmp1 = xcf_calc_levels (width, TILE_WIDTH);
  tmp2 = xcf_calc_levels (height, TILE_HEIGHT);
  nlevels = MAX (tmp1, tmp2);

  xcf_check_error (xcf_seek_pos (info, info->cp + (1 + nlevels) * 4, error));

  for (i = 0; i < nlevels; i++)
    {
      offset = info->cp;

      if (i == 0)
      {
        /* write out the level. */
        xcf_check_error (xcf_save_level (info, tiles, error));
      }
      else
      {
        /* fake an empty level */
        tmp1 = 0;
        width  /= 2;
        height /= 2;
        xcf_write_int32_check_error (info, (guint32 *) &width,  1);
        xcf_write_int32_check_error (info, (guint32 *) &height, 1);
        xcf_write_int32_check_error (info, (guint32 *) &tmp1,   1);
      }

      /* seek back to where we are to write out the next
       *  level offset and write it out.
       */
      xcf_check_error (xcf_seek_pos (info, saved_pos, error));
      xcf_write_int32_check_error (info, &offset, 1);

      /* increment the location we are to write out the
       *  next offset.
       */
      saved_pos = info->cp;

      /* seek to the end of the file which is where
       *  we will write out the next level.
       */
      xcf_check_error (xcf_seek_end (info, error));
    }

  /* write out a '0' offset position to indicate the end
   *  of the level offsets.
   */
  offset = 0;
  xcf_check_error (xcf_seek_pos (info, saved_pos, error));
  xcf_write_int32_check_error (info, &offset, 1);

  return TRUE;
}

static gboolean
xcf_save_level (XcfInfo     *info,
            TileManager *level,
            GError     **error)
{
  guint32  saved_pos;
  guint32  offset;
  guint32  width;
  guint32  height;
  guint    ntiles;
  gint     i;
  guchar  *rlebuf;

  GError *tmp_error = NULL;

  width  = tile_manager_width (level);
  height = tile_manager_height (level);

  xcf_write_int32_check_error (info, (guint32 *) &width, 1);
  xcf_write_int32_check_error (info, (guint32 *) &height, 1);

  saved_pos = info->cp;

  /* allocate a temporary buffer to store the rle data before it is
     written to disk */
  rlebuf =
    g_malloc (TILE_WIDTH * TILE_HEIGHT * tile_manager_bpp (level) * 1.5);

  if (level->tiles)
    {
      ntiles = level->ntile_rows * level->ntile_cols;
      xcf_check_error (xcf_seek_pos (info, info->cp + (ntiles + 1) * 4, error));

      for (i = 0; i < ntiles; i++)
      {
        /* save the start offset of where we are writing
         *  out the next tile.
         */
        offset = info->cp;

        /* write out the tile. */
        switch (info->compression)
          {
          case COMPRESS_NONE:
            xcf_check_error(xcf_save_tile (info, level->tiles[i], error));
            break;
          case COMPRESS_RLE:
            xcf_check_error (xcf_save_tile_rle (info, level->tiles[i],
                             rlebuf, error));
            break;
          case COMPRESS_ZLIB:
            g_error ("xcf: zlib compression unimplemented");
            break;
          case COMPRESS_FRACTAL:
            g_error ("xcf: fractal compression unimplemented");
            break;
          }

        /* seek back to where we are to write out the next
         *  tile offset and write it out.
         */
        xcf_check_error (xcf_seek_pos (info, saved_pos, error));
        xcf_write_int32_check_error (info, &offset, 1);

        /* increment the location we are to write out the
         *  next offset.
         */
        saved_pos = info->cp;

        /* seek to the end of the file which is where
         *  we will write out the next tile.
         */
        xcf_check_error (xcf_seek_end (info, error));
      }
    }

  g_free (rlebuf);

  /* write out a '0' offset position to indicate the end
   *  of the level offsets.
   */
  offset = 0;
  xcf_check_error (xcf_seek_pos (info, saved_pos, error));
  xcf_write_int32_check_error (info, &offset, 1);

  return TRUE;

}

static gboolean
xcf_save_tile (XcfInfo  *info,
             Tile     *tile,
             GError  **error)
{
  GError *tmp_error = NULL;

  tile_lock (tile);
  xcf_write_int8_check_error (info, tile_data_pointer (tile, 0, 0),
                        tile_size (tile));
  tile_release (tile, FALSE);

  return TRUE;
}

static gboolean
xcf_save_tile_rle (XcfInfo  *info,
               Tile     *tile,
               guchar   *rlebuf,
               GError  **error)
{
  guchar *data, *t;
  unsigned int last;
  gint state;
  gint length;
  gint count;
  gint size;
  gint bpp;
  gint i, j;
  gint len = 0;

  GError *tmp_error = NULL;

  tile_lock (tile);

  bpp = tile_bpp (tile);

  for (i = 0; i < bpp; i++)
    {
      data = (guchar*) tile_data_pointer (tile, 0, 0) + i;

      state = 0;
      length = 0;
      count = 0;
      size = tile_ewidth(tile) * tile_eheight(tile);
      last = -1;

      while (size > 0)
      {
        switch (state)
          {
          case 0:
            /* in state 0 we try to find a long sequence of
             *  matching values.
             */
            if ((length == 32768) ||
              ((size - length) <= 0) ||
              ((length > 1) && (last != *data)))
            {
              count += length;
              if (length >= 128)
                {
                  rlebuf[len++] = 127;
                      rlebuf[len++] = (length >> 8);
                      rlebuf[len++] = length & 0x00FF;
                  rlebuf[len++] = last;
                }
              else
                {
                  rlebuf[len++] = length - 1;
                  rlebuf[len++] = last;
                }
              size -= length;
              length = 0;
            }
            else if ((length == 1) && (last != *data))
            state = 1;
            break;

          case 1:
            /* in state 1 we try and find a long sequence of
             *  non-matching values.
             */
            if ((length == 32768) ||
              ((size - length) == 0) ||
              ((length > 0) && (last == *data) &&
               ((size - length) == 1 || last == data[bpp])))
            {
              count += length;
              state = 0;

              if (length >= 128)
                {
                  rlebuf[len++] = 255 - 127;
                      rlebuf[len++] = (length >> 8);
                      rlebuf[len++] = length & 0x00FF;
                }
              else
                {
                  rlebuf[len++] = 255 - (length - 1);
                }

              t = data - length * bpp;
              for (j = 0; j < length; j++)
                {
                  rlebuf[len++] = *t;
                  t += bpp;
                }

              size -= length;
              length = 0;
            }
            break;
          }

        if (size > 0) {
          length += 1;
          last = *data;
          data += bpp;
        }
      }

      if (count != (tile_ewidth (tile) * tile_eheight (tile)))
      g_message ("xcf: uh oh! xcf rle tile saving error: %d", count);
    }
  xcf_write_int8_check_error (info, rlebuf, len);
  tile_release (tile, FALSE);

  return TRUE;
}

static gboolean
xcf_save_parasite (XcfInfo       *info,
                   GimpParasite  *parasite,
                   GError       **error)
{
  if (gimp_parasite_is_persistent (parasite))
    {
      GError *tmp_error = NULL;

      xcf_write_string_check_error (info, &parasite->name,  1);
      xcf_write_int32_check_error  (info, &parasite->flags, 1);
      xcf_write_int32_check_error  (info, &parasite->size,  1);
      xcf_write_int8_check_error   (info, parasite->data, parasite->size);
    }

  return TRUE;
}

typedef struct
{
  XcfInfo *info;
  GError  *error;
} XcfParasiteData;

static void
xcf_save_parasite_func (gchar           *key,
                        GimpParasite    *parasite,
                        XcfParasiteData *data)
{
  if (! data->error)
    xcf_save_parasite (data->info, parasite, &data->error);
}

static gboolean
xcf_save_parasite_list (XcfInfo           *info,
                        GimpParasiteList  *list,
                        GError           **error)
{
  XcfParasiteData data;

  data.info  = info;
  data.error = NULL;

  gimp_parasite_list_foreach (list, (GHFunc) xcf_save_parasite_func, &data);

  if (data.error)
    {
      g_propagate_error (error, data.error);
      return FALSE;
    }

  return TRUE;
}

static gboolean
xcf_save_old_paths (XcfInfo    *info,
                    GimpImage  *gimage,
                    GError    **error)
{
  GimpVectors *active_vectors;
  guint32      num_paths;
  guint32      active_index = 0;
  GList       *list;
  GError      *tmp_error = NULL;

  /* Write out the following:-
   *
   * last_selected_row (gint)
   * number_of_paths (gint)
   *
   * then each path:-
   */

  num_paths = gimp_container_num_children (gimage->vectors);

  active_vectors = gimp_image_get_active_vectors (gimage);

  if (active_vectors)
    active_index = gimp_container_get_child_index (gimage->vectors,
                                                   GIMP_OBJECT (active_vectors));

  xcf_write_int32_check_error (info, &active_index, 1);
  xcf_write_int32_check_error (info, &num_paths,    1);

  for (list = GIMP_LIST (gimage->vectors)->list;
       list;
       list = g_list_next (list))
    {
      GimpVectors            *vectors = list->data;
      gchar                  *name;
      guint32                 locked;
      guint8                  state;
      guint32                 num_points;
      guint32                 closed;
      guint32                 version;
      guint32                 pathtype;
      guint32                 tattoo;
      GimpVectorsCompatPoint *points;
      gint                    i;

      /*
       * name (string)
       * locked (gint)
       * state (gchar)
       * closed (gint)
       * number points (gint)
       * version (gint)
       * pathtype (gint)
       * tattoo (gint)
       * then each point.
       */

      points = gimp_vectors_compat_get_points (vectors, &num_points, &closed);

      /* if no points are generated because of a faulty path we should
       * skip saving the path - this is unfortunately impossible, because
       * we already saved the number of paths and I wont start seeking
       * around to fix that cruft  */

      name     = (gchar *) gimp_object_get_name (GIMP_OBJECT (vectors));
      locked   = gimp_item_get_linked (GIMP_ITEM (vectors));
      state    = closed ? 4 : 2;  /* EDIT : ADD  (editing state, 1.2 compat) */
      version  = 3;
      pathtype = 1;  /* BEZIER  (1.2 compat) */
      tattoo   = gimp_item_get_tattoo (GIMP_ITEM (vectors));

      xcf_write_string_check_error (info, &name,       1);
      xcf_write_int32_check_error  (info, &locked,     1);
      xcf_write_int8_check_error   (info, &state,      1);
      xcf_write_int32_check_error  (info, &closed,     1);
      xcf_write_int32_check_error  (info, &num_points, 1);
      xcf_write_int32_check_error  (info, &version,    1);
      xcf_write_int32_check_error  (info, &pathtype,   1);
      xcf_write_int32_check_error  (info, &tattoo,     1);

      for (i = 0; i < num_points; i++)
        {
          gfloat x;
          gfloat y;

          x = points[i].x;
          y = points[i].y;

          /*
           * type (gint)
           * x (gfloat)
           * y (gfloat)
           */

          xcf_write_int32_check_error (info, &points[i].type, 1);
          xcf_write_float_check_error (info, &x,              1);
          xcf_write_float_check_error (info, &y,              1);
        }

      g_free (points);
    }

  return TRUE;
}

static gboolean
xcf_save_vectors (XcfInfo    *info,
                  GimpImage  *gimage,
                  GError    **error)
{
  GimpVectors *active_vectors;
  guint32      version      = 1;
  guint32      active_index = 0;
  guint32      num_paths;
  GList       *list;
  GList       *stroke_list;
  GError      *tmp_error = NULL;

  /* Write out the following:-
   *
   * version (gint)
   * active_index (gint)
   * num_paths (gint)
   *
   * then each path:-
   */

  active_vectors = gimp_image_get_active_vectors (gimage);

  if (active_vectors)
    active_index = gimp_container_get_child_index (gimage->vectors,
                                                   GIMP_OBJECT (active_vectors));

  num_paths = gimp_container_num_children (gimage->vectors);

  xcf_write_int32_check_error (info, &version,      1);
  xcf_write_int32_check_error (info, &active_index, 1);
  xcf_write_int32_check_error (info, &num_paths,    1);

  for (list = GIMP_LIST (gimage->vectors)->list;
       list;
       list = g_list_next (list))
    {
      GimpVectors      *vectors = list->data;
      GimpParasiteList *parasites;
      gchar            *name;
      guint32           tattoo;
      guint32           visible;
      guint32           linked;
      guint32           num_parasites;
      guint32           num_strokes;

      /*
       * name (string)
       * tattoo (gint)
       * visible (gint)
       * linked (gint)
       * num_parasites (gint)
       * num_strokes (gint)
       *
       * then each parasite
       * then each stroke
       */

      parasites = GIMP_ITEM (vectors)->parasites;

      name          = (gchar *) gimp_object_get_name (GIMP_OBJECT (vectors));
      visible       = gimp_item_get_visible (GIMP_ITEM (vectors));
      linked        = gimp_item_get_linked (GIMP_ITEM (vectors));
      tattoo        = gimp_item_get_tattoo (GIMP_ITEM (vectors));
      num_parasites = gimp_parasite_list_persistent_length (parasites);
      num_strokes   = g_list_length (vectors->strokes);

      xcf_write_string_check_error (info, &name,          1);
      xcf_write_int32_check_error  (info, &tattoo,        1);
      xcf_write_int32_check_error  (info, &visible,       1);
      xcf_write_int32_check_error  (info, &linked,        1);
      xcf_write_int32_check_error  (info, &num_parasites, 1);
      xcf_write_int32_check_error  (info, &num_strokes,   1);

      xcf_check_error (xcf_save_parasite_list (info, parasites, error));

      for (stroke_list = g_list_first (vectors->strokes);
           stroke_list;
           stroke_list = g_list_next (stroke_list))
        {
          GimpStroke *stroke;
          guint32     stroke_type;
          guint32     closed;
          guint32     num_axes;
          GArray     *control_points;
          gint        i;

          guint32     type;
          gfloat      coords[6];

          /*
           * stroke_type (gint)
           * closed (gint)
           * num_axes (gint)
           * num_control_points (gint)
           *
           * then each control point.
           */

          stroke = GIMP_STROKE (stroke_list->data);

          if (GIMP_IS_BEZIER_STROKE (stroke))
            {
              stroke_type = XCF_STROKETYPE_BEZIER_STROKE;
              num_axes = 2;   /* hardcoded, might be increased later */
            }
          else
            {
              g_printerr ("Skipping unknown stroke type!\n");
              continue;
            }

          control_points = gimp_stroke_control_points_get (stroke, &closed);

          xcf_write_int32_check_error (info, &stroke_type,         1);
          xcf_write_int32_check_error (info, &closed,              1);
          xcf_write_int32_check_error (info, &num_axes,            1);
          xcf_write_int32_check_error (info, &control_points->len, 1);

          for (i = 0; i < control_points->len; i++)
            {
              GimpAnchor *anchor;

              anchor = & (g_array_index (control_points, GimpAnchor, i));

              type      = anchor->type;
              coords[0] = anchor->position.x;
              coords[1] = anchor->position.y;
              coords[2] = anchor->position.pressure;
              coords[3] = anchor->position.xtilt;
              coords[4] = anchor->position.ytilt;
              coords[5] = anchor->position.wheel;

              /*
               * type (gint)
               *
               * the first num_axis elements of:
               * [0] x (gfloat)
               * [1] y (gfloat)
               * [2] pressure (gfloat)
               * [3] xtilt (gfloat)
               * [4] ytilt (gfloat)
               * [5] wheel (gfloat)
               */

              xcf_write_int32_check_error (info, &type, 1);
              xcf_write_float_check_error (info, coords, num_axes);
            }

          g_array_free (control_points, TRUE);
        }
    }

  return TRUE;
}

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