Adding upstream version 2.10.34.upstream/2.10.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1222 insertions, 0 deletions

diff --git a/plug-ins/file-fits/fits.c b/plug-ins/file-fits/fits.c
new file mode 100644
index 0000000..b843a68
--- /dev/null
+++ b/plug-ins/file-fits/fits.c
@@ -0,0 +1,1222 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ * FITS file plugin
+ * reading and writing code Copyright (C) 1997 Peter Kirchgessner
+ * e-mail: peter@kirchgessner.net, WWW: http://www.kirchgessner.net
+ *
+ * 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/>.
+ *
+ */
+
+/* Event history:
+ * V 1.00, PK, 05-May-97: Creation
+ * V 1.01, PK, 19-May-97: Problem with compilation on Irix fixed
+ * V 1.02, PK, 08-Jun-97: Bug with saving gray images fixed
+ * V 1.03, PK, 05-Oct-97: Parse rc-file
+ * V 1.04, PK, 12-Oct-97: No progress bars for non-interactive mode
+ * V 1.05, nn, 20-Dec-97: Initialize image_ID in run()
+ * V 1.06, PK, 21-Nov-99: Internationalization
+ *                        Fix bug with gimp_export_image()
+ *                        (moved it from load to save)
+ * V 1.07, PK, 16-Aug-06: Fix problems with internationalization
+ *                        (writing 255,0 instead of 255.0)
+ *                        Fix problem with not filling up properly last record
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include <errno.h>
+
+#include <glib/gstdio.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "fits-io.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+
+#define LOAD_PROC      "file-fits-load"
+#define SAVE_PROC      "file-fits-save"
+#define PLUG_IN_BINARY "file-fits"
+#define PLUG_IN_ROLE   "gimp-file-fits"
+
+
+/* Load info */
+typedef struct
+{
+  gint replace;     /* replacement for blank/NaN-values    */
+  gint use_datamin; /* Use DATAMIN/MAX-scaling if possible */
+  gint compose;     /* compose images with naxis==3        */
+} FITSLoadVals;
+
+
+/* Declare some local functions.
+ */
+static void          query              (void);
+static void          run                (const gchar        *name,
+                                         gint                nparams,
+                                         const GimpParam    *param,
+                                         gint               *nreturn_vals,
+                                         GimpParam         **return_vals);
+
+static gint32        load_image         (const gchar        *filename,
+                                         GError            **error);
+static gint          save_image         (const gchar        *filename,
+                                         gint32              image_ID,
+                                         gint32              drawable_ID,
+                                         GError            **error);
+
+static FitsHduList * create_fits_header (FitsFile           *ofp,
+                                         guint               width,
+                                         guint               height,
+                                         guint               channels,
+                                         guint               bitpix);
+
+static gint          save_fits        (FitsFile           *ofp,
+                                       gint32              image_ID,
+                                       gint32              drawable_ID);
+
+static gint32        create_new_image   (const gchar        *filename,
+                                         guint               pagenum,
+                                         guint               width,
+                                         guint               height,
+                                         GimpImageBaseType   itype,
+                                         GimpImageType       dtype,
+                                         GimpPrecision       iprecision,
+                                         gint32             *layer_ID,
+                                         GeglBuffer        **buffer);
+
+static void          check_load_vals    (void);
+
+static gint32        load_fits          (const gchar        *filename,
+                                         FitsFile           *ifp,
+                                         guint               picnum,
+                                         guint               ncompose);
+
+static gboolean      load_dialog        (void);
+static void          show_fits_errors   (void);
+
+
+static FITSLoadVals plvals =
+{
+  0,        /* Replace with black */
+  0,        /* Do autoscale on pixel-values */
+  0         /* Don't compose images */
+};
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run,   /* run_proc   */
+};
+
+/* The run mode */
+static GimpRunMode l_run_mode;
+
+
+MAIN ()
+
+static void
+query (void)
+
+{
+  static const GimpParamDef load_args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_STRING,   "filename",     "The name of the file to load" },
+    { GIMP_PDB_STRING,   "raw-filename", "The name of the file to load" },
+  };
+  static const GimpParamDef load_return_vals[] =
+  {
+    { GIMP_PDB_IMAGE,    "image",        "Output image" },
+  };
+
+  static const GimpParamDef save_args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_IMAGE,    "image",        "Input image" },
+    { GIMP_PDB_DRAWABLE, "drawable",     "Drawable to export" },
+    { GIMP_PDB_STRING,   "filename",     "The name of the file to export the image in" },
+    { GIMP_PDB_STRING,   "raw-filename", "The name of the file to export the image in" },
+  };
+
+  gimp_install_procedure (LOAD_PROC,
+                          "load file of the FITS file format",
+                          "load file of the FITS file format "
+                          "(Flexible Image Transport System)",
+                          "Peter Kirchgessner",
+                          "Peter Kirchgessner (peter@kirchgessner.net)",
+                          "1997",
+                          N_("Flexible Image Transport System"),
+                          NULL,
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (load_args),
+                          G_N_ELEMENTS (load_return_vals),
+                          load_args, load_return_vals);
+
+  gimp_register_file_handler_mime (LOAD_PROC, "image/x-fits");
+  gimp_register_magic_load_handler (LOAD_PROC,
+                                    "fit,fits",
+                                    "",
+                                    "0,string,SIMPLE");
+
+  gimp_install_procedure (SAVE_PROC,
+                          "export file in the FITS file format",
+                          "FITS exporting handles all image types except "
+                          "those with alpha channels.",
+                          "Peter Kirchgessner",
+                          "Peter Kirchgessner (peter@kirchgessner.net)",
+                          "1997",
+                          N_("Flexible Image Transport System"),
+                          "RGB, GRAY, INDEXED",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (save_args), 0,
+                          save_args, NULL);
+
+  gimp_register_file_handler_mime (SAVE_PROC, "image/x-fits");
+  gimp_register_save_handler (SAVE_PROC, "fit,fits", "");
+}
+
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam   values[2];
+  GimpRunMode        run_mode;
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+  gint32             image_ID;
+  gint32             drawable_ID;
+  GimpExportReturn   export = GIMP_EXPORT_CANCEL;
+  GError            *error  = NULL;
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  l_run_mode = run_mode = (GimpRunMode)param[0].data.d_int32;
+
+  *nreturn_vals = 1;
+  *return_vals  = values;
+
+  values[0].type          = GIMP_PDB_STATUS;
+  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
+
+  if (strcmp (name, LOAD_PROC) == 0)
+    {
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          /*  Possibly retrieve data  */
+          gimp_get_data (LOAD_PROC, &plvals);
+
+          if (!load_dialog ())
+            status = GIMP_PDB_CANCEL;
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          if (nparams != 3)
+            status = GIMP_PDB_CALLING_ERROR;
+          break;
+
+        case GIMP_RUN_WITH_LAST_VALS:
+          /* Possibly retrieve data */
+          gimp_get_data (LOAD_PROC, &plvals);
+          break;
+
+        default:
+          break;
+        }
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          check_load_vals ();
+          image_ID = load_image (param[1].data.d_string, &error);
+
+          /* Write out error messages of FITS-Library */
+          show_fits_errors ();
+
+          if (image_ID != -1)
+            {
+              *nreturn_vals = 2;
+              values[1].type         = GIMP_PDB_IMAGE;
+              values[1].data.d_image = image_ID;
+            }
+          else
+            {
+              status = GIMP_PDB_EXECUTION_ERROR;
+            }
+
+          /*  Store plvals data  */
+          if (status == GIMP_PDB_SUCCESS)
+            gimp_set_data (LOAD_PROC, &plvals, sizeof (FITSLoadVals));
+        }
+    }
+  else if (strcmp (name, SAVE_PROC) == 0)
+    {
+      image_ID = param[1].data.d_int32;
+      drawable_ID = param[2].data.d_int32;
+
+      /*  eventually export the image */
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+        case GIMP_RUN_WITH_LAST_VALS:
+          gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+          export = gimp_export_image (&image_ID, &drawable_ID, "FITS",
+                                      GIMP_EXPORT_CAN_HANDLE_RGB  |
+                                      GIMP_EXPORT_CAN_HANDLE_GRAY |
+                                      GIMP_EXPORT_CAN_HANDLE_INDEXED);
+
+        if (export == GIMP_EXPORT_CANCEL)
+          {
+            values[0].data.d_status = GIMP_PDB_CANCEL;
+            return;
+          }
+        break;
+      default:
+        break;
+      }
+
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          /*  Make sure all the arguments are there!  */
+          if (nparams != 5)
+            status = GIMP_PDB_CALLING_ERROR;
+          break;
+
+        case GIMP_RUN_WITH_LAST_VALS:
+          break;
+
+        default:
+          break;
+        }
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          if (! save_image (param[3].data.d_string, image_ID, drawable_ID,
+                            &error))
+            status = GIMP_PDB_EXECUTION_ERROR;
+        }
+
+      if (export == GIMP_EXPORT_EXPORT)
+        gimp_image_delete (image_ID);
+    }
+  else
+    {
+      status = GIMP_PDB_CALLING_ERROR;
+    }
+
+  if (status != GIMP_PDB_SUCCESS && error)
+    {
+      *nreturn_vals = 2;
+      values[1].type          = GIMP_PDB_STRING;
+      values[1].data.d_string = error->message;
+    }
+
+  values[0].data.d_status = status;
+}
+
+
+static gint32
+load_image (const gchar  *filename,
+            GError      **error)
+{
+  gint32       image_ID, *image_list, *nl;
+  guint        picnum;
+  gint         k, n_images, max_images, hdu_picnum;
+  gint         compose;
+  FILE        *fp;
+  FitsFile    *ifp;
+  FitsHduList *hdu;
+
+  fp = g_fopen (filename, "rb");
+  if (!fp)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for reading: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return -1;
+    }
+  fclose (fp);
+
+  ifp = fits_open (filename, "r");
+  if (ifp == NULL)
+    {
+      g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
+                   "%s", _("Error during open of FITS file"));
+      return -1;
+    }
+  if (ifp->n_pic <= 0)
+    {
+      g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
+                   "%s", _("FITS file keeps no displayable images"));
+      fits_close (ifp);
+      return -1;
+    }
+
+  image_list = g_new (gint32, 10);
+  n_images = 0;
+  max_images = 10;
+
+  for (picnum = 1; picnum <= ifp->n_pic; )
+    {
+      /* Get image info to see if we can compose them */
+      hdu = fits_image_info (ifp, picnum, &hdu_picnum);
+      if (hdu == NULL) break;
+
+      /* Get number of FITS-images to compose */
+      compose = (   plvals.compose && (hdu_picnum == 1) && (hdu->naxis == 3)
+                    && (hdu->naxisn[2] > 1) && (hdu->naxisn[2] <= 4));
+      if (compose)
+        compose = hdu->naxisn[2];
+      else
+        compose = 1;  /* Load as GRAY */
+
+      image_ID = load_fits (filename, ifp, picnum, compose);
+
+      /* Write out error messages of FITS-Library */
+      show_fits_errors ();
+
+      if (image_ID == -1) break;
+      if (n_images == max_images)
+        {
+          nl = (gint32 *)g_realloc (image_list, (max_images+10)*sizeof (gint32));
+          if (nl == NULL) break;
+          image_list = nl;
+          max_images += 10;
+        }
+      image_list[n_images++] = image_ID;
+
+      picnum += compose;
+    }
+
+  /* Write out error messages of FITS-Library */
+  show_fits_errors ();
+
+  fits_close (ifp);
+
+  /* Display images in reverse order. The last will be displayed by GIMP itself*/
+  if (l_run_mode != GIMP_RUN_NONINTERACTIVE)
+    {
+      for (k = n_images-1; k >= 1; k--)
+        {
+          gimp_image_undo_enable (image_list[k]);
+          gimp_image_clean_all (image_list[k]);
+          gimp_display_new (image_list[k]);
+        }
+    }
+
+  image_ID = (n_images > 0) ? image_list[0] : -1;
+  g_free (image_list);
+
+  return (image_ID);
+}
+
+
+static gint
+save_image (const gchar  *filename,
+            gint32        image_ID,
+            gint32        drawable_ID,
+            GError      **error)
+{
+  FitsFile      *ofp;
+  GimpImageType  drawable_type;
+  gint           retval;
+
+  drawable_type = gimp_drawable_type (drawable_ID);
+
+  /*  Make sure we're not exporting an image with an alpha channel  */
+  if (gimp_drawable_has_alpha (drawable_ID))
+    {
+      g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
+                   "%s",
+                   _("FITS export cannot handle images with alpha channels"));
+      return FALSE;
+    }
+
+  switch (drawable_type)
+    {
+    case GIMP_INDEXED_IMAGE: case GIMP_INDEXEDA_IMAGE:
+    case GIMP_GRAY_IMAGE:    case GIMP_GRAYA_IMAGE:
+    case GIMP_RGB_IMAGE:     case GIMP_RGBA_IMAGE:
+      break;
+    default:
+      g_message (_("Cannot operate on unknown image types."));
+      return (FALSE);
+      break;
+    }
+
+  gimp_progress_init_printf (_("Exporting '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  /* Open the output file. */
+  ofp = fits_open (filename, "w");
+  if (!ofp)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for writing: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return (FALSE);
+    }
+
+  retval = save_fits (ofp,image_ID, drawable_ID);
+
+  fits_close (ofp);
+
+  return (retval);
+}
+
+
+/* Check (and correct) the load values plvals */
+static void
+check_load_vals (void)
+{
+  if (plvals.replace > 255) plvals.replace = 255;
+}
+
+
+/* Create an image. Sets layer_ID, drawable and rgn. Returns image_ID */
+static gint32
+create_new_image (const gchar        *filename,
+                  guint               pagenum,
+                  guint               width,
+                  guint               height,
+                  GimpImageBaseType   itype,
+                  GimpImageType       dtype,
+                  GimpPrecision       iprecision,
+                  gint32             *layer_ID,
+                  GeglBuffer        **buffer)
+{
+  gint32  image_ID;
+  char   *tmp;
+
+  image_ID = gimp_image_new_with_precision (width, height, itype, iprecision);
+
+  if ((tmp = g_malloc (strlen (filename) + 64)) != NULL)
+    {
+      sprintf (tmp, "%s-img%ld", filename, (long)pagenum);
+      gimp_image_set_filename (image_ID, tmp);
+      g_free (tmp);
+    }
+  else
+    gimp_image_set_filename (image_ID, filename);
+
+  gimp_image_undo_disable (image_ID);
+  *layer_ID = gimp_layer_new (image_ID, _("Background"), width, height,
+                              dtype, 100,
+                              gimp_image_get_default_new_layer_mode (image_ID));
+  gimp_image_insert_layer (image_ID, *layer_ID, -1, 0);
+
+  *buffer = gimp_drawable_get_buffer (*layer_ID);
+
+  return image_ID;
+}
+
+
+/* Load FITS image. ncompose gives the number of FITS-images which have
+ * to be composed together. This will result in different GIMP image types:
+ * 1: GRAY, 2: GRAYA, 3: RGB, 4: RGBA
+ */
+static gint32
+load_fits (const gchar *filename,
+           FitsFile    *ifp,
+           guint        picnum,
+           guint        ncompose)
+{
+  register guchar   *dest, *src;
+  guchar            *data, *data_end, *linebuf;
+  int                width, height, tile_height, scan_lines;
+  int                i, j, max_scan;
+  double             a, b;
+  gint32             layer_ID, image_ID;
+  GeglBuffer        *buffer;
+  GimpImageBaseType  itype;
+  GimpImageType      dtype;
+  GimpPrecision      iprecision;
+  gint               err = 0;
+  FitsHduList       *hdulist;
+  FitsPixTransform   trans;
+  double             datamax, replacetransform;
+  const Babl        *type, *format;
+
+  hdulist = fits_seek_image (ifp, (int)picnum);
+  if (hdulist == NULL)
+    return -1;
+
+  width  = hdulist->naxisn[0];  /* Set the size of the FITS image */
+  height = hdulist->naxisn[1];
+
+  switch (hdulist->bitpix)
+    {
+    case 8:
+      iprecision = GIMP_PRECISION_U8_GAMMA;
+      type = babl_type ("u8");
+      datamax = 255.0;
+      replacetransform = 1.0;
+      break;
+    case 16:
+      iprecision = GIMP_PRECISION_U16_GAMMA; /* FIXME precision */
+      type = babl_type ("u16");
+      datamax = 65535.0;
+      replacetransform = 257;
+      break;
+    case 32:
+      iprecision = GIMP_PRECISION_U32_LINEAR;
+      type = babl_type ("u32");
+      datamax = 4294967295.0;
+      replacetransform = 16843009;
+      break;
+    case -32:
+      iprecision = GIMP_PRECISION_FLOAT_LINEAR;
+      type = babl_type ("float");
+      datamax = 1.0;
+      replacetransform = 1.0 / 255.0;
+      break;
+    case -64:
+      iprecision = GIMP_PRECISION_DOUBLE_LINEAR;
+      type = babl_type ("double");
+      datamax = 1.0;
+      replacetransform = 1.0 / 255.0;
+      break;
+    default:
+      return -1;
+    }
+
+  if (ncompose == 2)
+    {
+      itype = GIMP_GRAY;
+      dtype = GIMP_GRAYA_IMAGE;
+      format = babl_format_new (babl_model ("Y'A"),
+                                type,
+                                babl_component ("Y'"),
+                                babl_component ("A"),
+                                NULL);
+    }
+  else if (ncompose == 3)
+    {
+      itype = GIMP_RGB;
+      dtype = GIMP_RGB_IMAGE;
+      format = babl_format_new (babl_model ("R'G'B'"),
+                                type,
+                                babl_component ("R'"),
+                                babl_component ("G'"),
+                                babl_component ("B'"),
+                                NULL);
+    }
+  else if (ncompose == 4)
+    {
+      itype = GIMP_RGB;
+      dtype = GIMP_RGBA_IMAGE;
+      format = babl_format_new (babl_model ("R'G'B'A"),
+                                type,
+                                babl_component ("R'"),
+                                babl_component ("G'"),
+                                babl_component ("B'"),
+                                babl_component ("A"),
+                                NULL);
+    }
+  else
+    {
+      ncompose = 1;
+      itype = GIMP_GRAY;
+      dtype = GIMP_GRAY_IMAGE;
+      format = babl_format_new (babl_model ("Y'"),
+                                type,
+                                babl_component ("Y'"),
+                                NULL);
+    }
+
+  image_ID = create_new_image (filename, picnum, width, height,
+                               itype, dtype, iprecision,
+                               &layer_ID, &buffer);
+
+  tile_height = gimp_tile_height ();
+
+  data = g_malloc (tile_height * width * ncompose * hdulist->bpp);
+  if (data == NULL)
+    return -1;
+
+  data_end = data + tile_height * width * ncompose * hdulist->bpp;
+
+  /* If the transformation from pixel value to data value has been
+   * specified, use it
+   */
+  if (plvals.use_datamin    &&
+      hdulist->used.datamin && hdulist->used.datamax &&
+      hdulist->used.bzero   && hdulist->used.bscale)
+    {
+      a = (hdulist->datamin - hdulist->bzero) / hdulist->bscale;
+      b = (hdulist->datamax - hdulist->bzero) / hdulist->bscale;
+
+      if (a < b)
+        trans.pixmin = a, trans.pixmax = b;
+      else
+        trans.pixmin = b, trans.pixmax = a;
+    }
+  else
+    {
+      trans.pixmin = hdulist->pixmin;
+      trans.pixmax = hdulist->pixmax;
+    }
+
+  trans.datamin     = 0.0;
+  trans.datamax     = datamax;
+  trans.replacement = plvals.replace * replacetransform;
+  trans.dsttyp      = 'k';
+
+  /* FITS stores images with bottom row first. Therefore we have to
+   * fill the image from bottom to top.
+   */
+
+  if (ncompose == 1)
+    {
+      dest = data + tile_height * width * hdulist->bpp;
+      scan_lines = 0;
+
+      for (i = 0; i < height; i++)
+        {
+          /* Read FITS line */
+          dest -= width * hdulist->bpp;
+          if (fits_read_pixel (ifp, hdulist, width, &trans, dest) != width)
+            {
+              err = 1;
+              break;
+            }
+
+          scan_lines++;
+
+          if ((i % 20) == 0)
+            gimp_progress_update ((gdouble) (i + 1) / (gdouble) height);
+
+          if ((scan_lines == tile_height) || ((i + 1) == height))
+            {
+              gegl_buffer_set (buffer,
+                               GEGL_RECTANGLE (0, height - i - 1,
+                                               width, scan_lines), 0,
+                               format, dest, GEGL_AUTO_ROWSTRIDE);
+
+              scan_lines = 0;
+              dest = data + tile_height * width * hdulist->bpp;
+            }
+
+          if (err)
+            break;
+        }
+    }
+  else   /* multiple images to compose */
+    {
+      gint channel;
+
+      linebuf = g_malloc (width * hdulist->bpp);
+      if (linebuf == NULL)
+        return -1;
+
+      for (channel = 0; channel < ncompose; channel++)
+        {
+          dest = data + tile_height * width * hdulist->bpp * ncompose + channel * hdulist->bpp;
+          scan_lines = 0;
+
+          for (i = 0; i < height; i++)
+            {
+              if ((channel > 0) && ((i % tile_height) == 0))
+                {
+                  /* Reload a region for follow up channels */
+                  max_scan = tile_height;
+
+                  if (i + tile_height > height)
+                    max_scan = height - i;
+
+                  gegl_buffer_get (buffer,
+                                   GEGL_RECTANGLE (0, height - i - max_scan,
+                                                   width, max_scan), 1.0,
+                                   format, data_end - max_scan * width * hdulist->bpp * ncompose,
+                                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+                }
+
+              /* Read FITS scanline */
+              dest -= width * ncompose * hdulist->bpp;
+              if (fits_read_pixel (ifp, hdulist, width, &trans, linebuf) != width)
+                {
+                  err = 1;
+                  break;
+                }
+              j = width;
+              src = linebuf;
+              while (j--)
+                {
+                  memcpy (dest, src, hdulist->bpp);
+                  src += hdulist->bpp;
+                  dest += ncompose * hdulist->bpp;
+                }
+              dest -= width * ncompose * hdulist->bpp;
+              scan_lines++;
+
+              if ((i % 20) == 0)
+                gimp_progress_update ((gdouble) (channel * height + i + 1) /
+                                      (gdouble) (height * ncompose));
+
+              if ((scan_lines == tile_height) || ((i + 1) == height))
+                {
+                  gegl_buffer_set (buffer,
+                                   GEGL_RECTANGLE (0, height - i - 1,
+                                                   width, scan_lines), 0,
+                                   format, dest - channel * hdulist->bpp, GEGL_AUTO_ROWSTRIDE);
+
+                  scan_lines = 0;
+                  dest = data + tile_height * width * ncompose * hdulist->bpp + channel * hdulist->bpp;
+                }
+
+              if (err)
+                break;
+            }
+        }
+
+      g_free (linebuf);
+    }
+
+  g_free (data);
+
+  if (err)
+    g_message (_("EOF encountered on reading"));
+
+  g_object_unref (buffer);
+
+  gimp_progress_update (1.0);
+
+  return err ? -1 : image_ID;
+}
+
+
+static FitsHduList *
+create_fits_header (FitsFile *ofp,
+                    guint     width,
+                    guint     height,
+                    guint     channels,
+                    guint     bitpix)
+{
+  FitsHduList *hdulist;
+  gint         print_ctype3 = 0; /* The CTYPE3-card may not be FITS-conforming */
+
+  static const char *ctype3_card[] =
+  {
+    NULL, NULL, NULL,  /* bpp = 0: no additional card */
+    "COMMENT Image type within GIMP: GIMP_GRAY_IMAGE",
+    NULL,
+    NULL,
+    "COMMENT Image type within GIMP: GIMP_GRAYA_IMAGE (gray with alpha channel)",
+    "COMMENT Sequence for NAXIS3   : GRAY, ALPHA",
+    "CTYPE3  = 'GRAYA   '           / GRAY IMAGE WITH ALPHA CHANNEL",
+    "COMMENT Image type within GIMP: GIMP_RGB_IMAGE",
+    "COMMENT Sequence for NAXIS3   : RED, GREEN, BLUE",
+    "CTYPE3  = 'RGB     '           / RGB IMAGE",
+    "COMMENT Image type within GIMP: GIMP_RGBA_IMAGE (rgb with alpha channel)",
+    "COMMENT Sequence for NAXIS3   : RED, GREEN, BLUE, ALPHA",
+    "CTYPE3  = 'RGBA    '           / RGB IMAGE WITH ALPHA CHANNEL"
+  };
+
+  hdulist = fits_add_hdu (ofp);
+  if (hdulist == NULL)
+    return NULL;
+
+  hdulist->used.simple  = 1;
+  hdulist->bitpix       = bitpix;
+  hdulist->naxis        = (channels == 1) ? 2 : 3;
+  hdulist->naxisn[0]    = width;
+  hdulist->naxisn[1]    = height;
+  hdulist->naxisn[2]    = channels;
+  hdulist->used.datamin = 1;
+  hdulist->datamin      = 0.0;
+  hdulist->used.datamax = 1;
+  hdulist->used.bzero   = 1;
+  hdulist->bzero        = 0.0;
+  hdulist->used.bscale  = 1;
+  hdulist->bscale       = 1.0;
+
+  switch (bitpix)
+    {
+    case 8:
+      hdulist->datamax = 255;
+      break;
+    case 16:
+      hdulist->datamax = 65535;
+      break;
+    case 32:
+      hdulist->datamax = 4294967295.0; /* .0 to silence gcc */
+      break;
+    case -32:
+      hdulist->datamax = 1.0;
+      break;
+    case -64:
+      hdulist->datamax = 1.0;
+      break;
+    default:
+      return NULL;
+    }
+
+  fits_add_card (hdulist, "");
+  fits_add_card (hdulist,
+                 "HISTORY THIS FITS FILE WAS GENERATED BY GIMP USING FITSRW");
+  fits_add_card (hdulist, "");
+  fits_add_card (hdulist,
+                 "COMMENT FitsRW is (C) Peter Kirchgessner (peter@kirchgessner.net), but available");
+  fits_add_card (hdulist,
+                 "COMMENT under the GNU general public licence.");
+  fits_add_card (hdulist,
+                 "COMMENT For sources see http://www.kirchgessner.net");
+  fits_add_card (hdulist, "");
+  fits_add_card (hdulist, ctype3_card[channels * 3]);
+
+  if (ctype3_card[channels * 3 + 1] != NULL)
+    fits_add_card (hdulist, ctype3_card[channels * 3 + 1]);
+
+  if (print_ctype3 && (ctype3_card[channels * 3 + 2] != NULL))
+    fits_add_card (hdulist, ctype3_card[channels * 3 + 2]);
+
+  fits_add_card (hdulist, "");
+
+  return hdulist;
+}
+
+
+/* Save direct colors (GRAY, GRAYA, RGB, RGBA) */
+static gint
+save_fits (FitsFile *ofp,
+           gint32    image_ID,
+           gint32    drawable_ID)
+{
+  gint           height, width, i, j, channel, channelnum;
+  gint           tile_height, bpp, bpsl, bitpix, bpc;
+  long           nbytes;
+  guchar        *data, *src;
+  GeglBuffer    *buffer;
+  const Babl    *format, *type;
+  FitsHduList   *hdu;
+
+  buffer = gimp_drawable_get_buffer (drawable_ID);
+
+  width  = gegl_buffer_get_width  (buffer);
+  height = gegl_buffer_get_height (buffer);
+
+  format = gegl_buffer_get_format (buffer);
+  type   = babl_format_get_type (format, 0);
+
+  if (type == babl_type ("u8"))
+    {
+      bitpix = 8;
+    }
+  else if (type == babl_type ("u16"))
+    {
+      bitpix = 16;
+    }
+  else if (type == babl_type ("u32"))
+    {
+      bitpix = 32;
+    }
+  else if (type == babl_type ("half"))
+    {
+      bitpix = -32;
+      type = babl_type ("float");
+    }
+  else if (type == babl_type ("float"))
+    {
+      bitpix = -32;
+    }
+  else if (type == babl_type ("double"))
+    {
+      bitpix = -64;
+    }
+  else
+    {
+      return FALSE;
+    }
+
+  switch (gimp_drawable_type (drawable_ID))
+    {
+    case GIMP_GRAY_IMAGE:
+      format = babl_format_new (babl_model ("Y'"),
+                                type,
+                                babl_component ("Y'"),
+                                NULL);
+      break;
+
+    case GIMP_GRAYA_IMAGE:
+      format = babl_format_new (babl_model ("Y'A"),
+                                type,
+                                babl_component ("Y'"),
+                                babl_component ("A"),
+                                NULL);
+      break;
+
+    case GIMP_RGB_IMAGE:
+    case GIMP_INDEXED_IMAGE:
+      format = babl_format_new (babl_model ("R'G'B'"),
+                                type,
+                                babl_component ("R'"),
+                                babl_component ("G'"),
+                                babl_component ("B'"),
+                                NULL);
+      break;
+
+    case GIMP_RGBA_IMAGE:
+    case GIMP_INDEXEDA_IMAGE:
+      format = babl_format_new (babl_model ("R'G'B'A"),
+                                type,
+                                babl_component ("R'"),
+                                babl_component ("G'"),
+                                babl_component ("B'"),
+                                babl_component ("A"),
+                                NULL);
+      break;
+    }
+
+  channelnum = babl_format_get_n_components (format);
+  bpp        = babl_format_get_bytes_per_pixel (format);
+
+  bpc  = bpp / channelnum; /* Bytes per channel */
+  bpsl = width * bpp;      /* Bytes per scanline */
+
+  tile_height = gimp_tile_height ();
+
+  /* allocate a buffer for retrieving information from the pixel region  */
+  src = data = (guchar *) g_malloc (width * height * bpp);
+
+  hdu = create_fits_header (ofp, width, height, channelnum, bitpix);
+  if (hdu == NULL)
+    return FALSE;
+
+  if (fits_write_header (ofp, hdu) < 0)
+    return FALSE;
+
+  nbytes = 0;
+  for (channel = 0; channel < channelnum; channel++)
+    {
+      for (i = 0; i < height; i++)
+        {
+          if ((i % tile_height) == 0)
+            {
+              gint scan_lines;
+
+              scan_lines = (i + tile_height-1 < height) ?
+                            tile_height : (height - i);
+
+              gegl_buffer_get (buffer,
+                               GEGL_RECTANGLE (0, height - i - scan_lines,
+                                               width, scan_lines), 1.0,
+                               format, data,
+                               GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+              src = data + bpsl * (scan_lines - 1) + channel * bpc;
+            }
+
+          if (channelnum == 1 && bitpix == 8)  /* One channel and 8 bit? Write the scanline */
+            {
+              fwrite (src, bpc, width, ofp->fp);
+              src += bpsl;
+            }
+          else           /* Multiple channels or high bit depth */
+            {
+            /* Write out bytes for current channel */
+            /* FIXME: Don't assume a little endian arch */
+            switch (bitpix)
+              {
+              case 8:
+                for (j = 0; j < width; j++)
+                  {
+                    putc (*src, ofp->fp);
+                    src += bpp;
+                  }
+                break;
+              case 16:
+                for (j = 0; j < width; j++)
+                  {
+                    *((guint16*)src) += 32768;
+                    putc (*(src + 1), ofp->fp);
+                    putc (*(src + 0), ofp->fp);
+                    src += bpp;
+                  }
+                break;
+              case 32:
+                for (j = 0; j < width; j++)
+                  {
+                    *((guint32*)src) += 2147483648.0; /* .0 to silence gcc */
+                    putc (*(src + 3), ofp->fp);
+                    putc (*(src + 2), ofp->fp);
+                    putc (*(src + 1), ofp->fp);
+                    putc (*(src + 0), ofp->fp);
+                    src += bpp;
+                  }
+                break;
+              case -32:
+                for (j = 0; j < width; j++)
+                  {
+                    putc (*(src + 3), ofp->fp);
+                    putc (*(src + 2), ofp->fp);
+                    putc (*(src + 1), ofp->fp);
+                    putc (*(src + 0), ofp->fp);
+                    src += bpp;
+                  }
+                break;
+              case -64:
+                for (j = 0; j < width; j++)
+                  {
+                    putc (*(src + 7), ofp->fp);
+                    putc (*(src + 6), ofp->fp);
+                    putc (*(src + 5), ofp->fp);
+                    putc (*(src + 4), ofp->fp);
+                    putc (*(src + 3), ofp->fp);
+                    putc (*(src + 2), ofp->fp);
+                    putc (*(src + 1), ofp->fp);
+                    putc (*(src + 0), ofp->fp);
+                    src += bpp;
+                  }
+                break;
+              default:
+                return FALSE;
+              }
+            }
+
+          nbytes += width * bpc;
+          src -= 2 * bpsl;
+
+          if ((i % 20) == 0)
+            gimp_progress_update ((gdouble) (i + channel * height) /
+                                  (gdouble) (height * channelnum));
+        }
+    }
+
+  nbytes = nbytes % FITS_RECORD_SIZE;
+  if (nbytes)
+    {
+      while (nbytes++ < FITS_RECORD_SIZE)
+        putc (0, ofp->fp);
+    }
+
+  g_free (data);
+
+  g_object_unref (buffer);
+
+  gimp_progress_update (1.0);
+
+  if (ferror (ofp->fp))
+    {
+      g_message (_("Write error occurred"));
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+
+/*  Load interface functions  */
+
+static gboolean
+load_dialog (void)
+{
+  GtkWidget *dialog;
+  GtkWidget *vbox;
+  GtkWidget *frame;
+  gboolean   run;
+
+  gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+  dialog = gimp_dialog_new (_("Load FITS File"), PLUG_IN_ROLE,
+                            NULL, 0,
+                            gimp_standard_help_func, LOAD_PROC,
+
+                            _("_Cancel"), GTK_RESPONSE_CANCEL,
+                            _("_Open"),   GTK_RESPONSE_OK,
+
+                            NULL);
+
+  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
+                                           GTK_RESPONSE_OK,
+                                           GTK_RESPONSE_CANCEL,
+                                           -1);
+
+  gtk_window_set_resizable (GTK_WINDOW (dialog), FALSE);
+
+  gimp_window_set_transient (GTK_WINDOW (dialog));
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
+  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
+                      vbox, TRUE, TRUE, 0);
+  gtk_widget_show (vbox);
+
+  frame = gimp_int_radio_group_new (TRUE, _("Replacement for undefined pixels"),
+                                    G_CALLBACK (gimp_radio_button_update),
+                                    &plvals.replace, plvals.replace,
+
+                                    _("_Black"), 0,   NULL,
+                                    _("_White"), 255, NULL,
+
+                                    NULL);
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  frame =
+    gimp_int_radio_group_new (TRUE, _("Pixel value scaling"),
+                              G_CALLBACK (gimp_radio_button_update),
+                              &plvals.use_datamin, plvals.use_datamin,
+
+                              _("_Automatic"),          FALSE, NULL,
+                              _("By _DATAMIN/DATAMAX"), TRUE,  NULL,
+
+                              NULL);
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  frame =
+    gimp_int_radio_group_new (TRUE, _("Image Composing"),
+                              G_CALLBACK (gimp_radio_button_update),
+                              &plvals.compose, plvals.compose,
+
+                              C_("composing", "_None"),   FALSE, NULL,
+                              "NA_XIS=3, NAXIS3=2,...,4", TRUE,  NULL,
+
+                              NULL);
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  gtk_widget_show (dialog);
+
+  run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+
+  gtk_widget_destroy (dialog);
+
+  return run;
+}
+
+static void
+show_fits_errors (void)
+{
+  const gchar *msg;
+
+  /* Write out error messages of FITS-Library */
+  while ((msg = fits_get_error ()) != NULL)
+    g_message ("%s", msg);
+}