gimp/plug-ins/common/gih.c

/* Plug-in to load and save .gih (GIMP Brush Pipe) files.
 *
 * Copyright (C) 1999 Tor Lillqvist
 * Copyright (C) 2000 Jens Lautenbacher, Sven Neumann
 *
 * 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.
 */

  /* Example of how to call file_gih_save from script-fu:

  (let ((ranks (cons-array 1 'byte)))
    (aset ranks 0 12)
    (file-gih-save 1
		   img
		   drawable
		   "foo.gih"
		   "foo.gih"
		   100
		   "test brush"
		   125
		   125
		   3
		   4
		   1
		   ranks
		   1
		   '("random")))
  */


#include "config.h"

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <glib/gstdio.h>

#include <glib.h>

#ifdef G_OS_WIN32
#include <io.h>
#endif

#ifndef _O_BINARY
#define _O_BINARY 0
#endif

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

#include "app/core/gimpbrush-header.h"
#include "app/core/gimppattern-header.h"

#include "libgimp/stdplugins-intl.h"


#define DUMMY_PATTERN_NAME "x"

#define MAXDESCLEN 256

/* Parameters applicable each time we save a gih, saved in the
 * main gimp application between invocations of this plug-in.
 */
static struct
{
  guint  spacing;
  gchar  description[MAXDESCLEN+1];
} info =
/* Initialize to this, change if non-interactive later */
{
  20,
  "GIMP Brush Pipe"
};


static gint num_useable_layers;

static gchar *selection_modes[] = {"incremental",
                                   "angular",
                                   "random",
                                   "velocity",
                                   "pressure",
                                   "xtilt",
                                   "ytilt"};

static GimpPixPipeParams gihparams;

typedef struct
{
  GimpOrientationType orientation;
  gint32     image;
  gint32     toplayer;
  gint       nguides;
  gint32    *guides;
  gint      *value;
  GtkWidget *count_label;	/* Corresponding count adjustment, */
  gint      *count;		/* cols or rows                    */
  gint      *other_count;       /* and the other one               */
  GtkObject *ncells;
  GtkObject *rank0;
  GtkWidget *warning_label;
  GtkWidget *rank_entry[GIMP_PIXPIPE_MAXDIM];
  GtkWidget *mode_entry[GIMP_PIXPIPE_MAXDIM];
} SizeAdjustmentData;

/* static gint32 *vguides, *hguides;       */
/* static gint nvguides = 0, nhguides = 0; */

/* 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    gih_load_image      (const gchar  *filename);
static gboolean  gih_load_one_brush  (gint          fd,
				      gint32        image_ID);

static gboolean  gih_save_dialog     (gint32        image_ID);
static gboolean  gih_save_one_brush  (gint          fd,
				      GimpPixelRgn *pixel_rgn,
				      gchar        *name);
static gboolean  gih_save_image      (const gchar  *filename,
				      gint32        image_ID,
				      gint32        orig_image_ID,
				      gint32        drawable_ID);


GimpPlugInInfo PLUG_IN_INFO =
{
  NULL,  /* init_proc  */
  NULL,  /* quit_proc  */
  query, /* query_proc */
  run,   /* run_proc   */
};

MAIN ()

static void
query (void)
{
  static GimpParamDef gih_save_args[] =
  {
    { GIMP_PDB_INT32,    "run_mode",     "Interactive, non-interactive" },
    { GIMP_PDB_IMAGE,    "image",        "Input image" },
    { GIMP_PDB_DRAWABLE, "drawable",     "Drawable to save" },
    { GIMP_PDB_STRING,   "filename",     "The name of the file to save the brush pipe in" },
    { GIMP_PDB_STRING,   "raw_filename", "The name of the file to save the brush pipe in" },
    { GIMP_PDB_INT32,    "spacing",      "Spacing of the brush" },
    { GIMP_PDB_STRING,   "description",  "Short description of the brush pipe" },
    { GIMP_PDB_INT32,    "cell_width",	 "Width of the brush cells" },
    { GIMP_PDB_INT32,    "cell_height",	 "Width of the brush cells" },
    { GIMP_PDB_INT8,     "display_cols",   "Display column number" },
    { GIMP_PDB_INT8,     "display_rows",   "Display row number" },
    { GIMP_PDB_INT32,     "dimension",	 "Dimension of the brush pipe" },
    /* The number of rank and sel args depend on the dimension */
    { GIMP_PDB_INT8ARRAY,"rank",		 "Ranks of the dimensions" },
    { GIMP_PDB_INT32,     "dimension",	 "Dimension (again)" },
    { GIMP_PDB_STRINGARRAY, "sel",	 "Selection modes" }
  };

  static GimpParamDef gih_load_args[] =
  {
    { GIMP_PDB_INT32,  "run_mode",       "Interactive, non-interactive" },
    { GIMP_PDB_STRING, "filename",       "The name of the file to load" },
    { GIMP_PDB_STRING, "raw_filename",   "The name of the file to load" }
  };
  static GimpParamDef gih_load_return_vals[] =
  {
    { GIMP_PDB_IMAGE,  "image",          "Output image" }
  };


  gimp_install_procedure ("file_gih_load",
			  "loads images in GIMP brush pipe format",
			  "This plug-in loads a GIMP brush pipe as an image.",
			  "Jens Lautenbacher, Sven Neumann",
			  "Jens Lautenbacher, Sven Neumann",
			  "2000",
                          N_("GIMP brush (animated)"),
			  NULL,
			  GIMP_PLUGIN,
                          G_N_ELEMENTS (gih_load_args),
                          G_N_ELEMENTS (gih_load_return_vals),
                          gih_load_args, gih_load_return_vals);

  gimp_plugin_icon_register ("file_gih_load",
                             GIMP_ICON_TYPE_STOCK_ID, GIMP_STOCK_BRUSH);
  gimp_register_file_handler_mime ("file_gih_load", "image/x-gimp-gih");
  gimp_register_magic_load_handler ("file_gih_load",
				    "gih",
				    "",
				    "");

  gimp_install_procedure ("file_gih_save",
			  "saves images in GIMP brush pipe format",
			  "This plug-in saves an image in the GIMP brush pipe format. The image must have an alpha chnannel and can be multi-layered, and additionally the layers can be divided into a rectangular array of brushes.",
			  "Tor Lillqvist",
			  "Tor Lillqvist",
			  "1999",
			  N_("GIMP brush (animated)"),
			  "RGBA, GRAYA",
			  GIMP_PLUGIN,
                          G_N_ELEMENTS (gih_save_args), 0,
			  gih_save_args, NULL);

  gimp_plugin_icon_register ("file_gih_save",
                             GIMP_ICON_TYPE_STOCK_ID, GIMP_STOCK_BRUSH);
  gimp_register_file_handler_mime ("file_gih_save", "image/x-gimp-gih");
  gimp_register_save_handler ("file_gih_save",
			      "gih",
			      "");
}

static void
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
{
  static GimpParam   values[1];
  GimpRunMode        run_mode;
  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
  GimpParasite      *pipe_parasite;
  gint32             image_ID;
  gint32             orig_image_ID;
  gint32             drawable_ID;
  gint32            *layer_ID;
  gint               nlayers, layer;
  gchar             *layer_name;
  gint               i;
  GimpExportReturn   export = GIMP_EXPORT_CANCEL;

  run_mode = param[0].data.d_int32;

  *return_vals  = values;
  *nreturn_vals = 1;

  values[0].type          = GIMP_PDB_STATUS;
  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;

  INIT_I18N();

  if (strcmp (name, "file_gih_load") == 0)
    {
      image_ID = gih_load_image (param[1].data.d_string);

      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;
	}
    }
  else if (strcmp (name, "file_gih_save") == 0)
    {
      image_ID = orig_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 ("gih", FALSE);
	  export = gimp_export_image (&image_ID, &drawable_ID, "GIH",
				      GIMP_EXPORT_CAN_HANDLE_RGB    |
				      GIMP_EXPORT_CAN_HANDLE_GRAY   |
				      GIMP_EXPORT_CAN_HANDLE_ALPHA  |
				      GIMP_EXPORT_CAN_HANDLE_LAYERS |
				      GIMP_EXPORT_NEEDS_ALPHA);
	  if (export == GIMP_EXPORT_CANCEL)
	    {
	      values[0].data.d_status = GIMP_PDB_CANCEL;
	      return;
	    }
	  break;
	default:
	  break;
	}

      layer_ID = gimp_image_get_layers (image_ID, &nlayers);
      num_useable_layers = 0;
      for (layer = 0; layer < nlayers; layer++)
	{
	  if (!gimp_drawable_has_alpha (layer_ID[layer]))
	    {
	      layer_name = gimp_drawable_get_name (layer_ID[layer]);
	      g_message (_("Layer %s doesn't have an alpha channel, skipped"),
			 layer_name);
	      g_free (layer_name);
	    }
	  num_useable_layers++;
	}

      switch (run_mode)
	{
	case GIMP_RUN_INTERACTIVE:
	  /*  Possibly retrieve data  */
	  gimp_get_data ("file_gih_save", &info);

	  gimp_pixpipe_params_init (&gihparams);

	  /* Setup default values */
	  if (gihparams.rows < 1) gihparams.rows = 1;
	  if (gihparams.cols < 1) gihparams.cols = 1;

	  gihparams.ncells = num_useable_layers * gihparams.rows * gihparams.cols;

	  if (gihparams.cellwidth == 1 && gihparams.cellheight == 1)
	    {
	      gihparams.cellwidth  =
		gimp_image_width (image_ID)  / gihparams.cols;
	      gihparams.cellheight =
		gimp_image_height (image_ID) / gihparams.rows;
	    }

	  pipe_parasite =
	    gimp_image_parasite_find (orig_image_ID,
				      "gimp-brush-pipe-parameters");
	  if (pipe_parasite)
	    gimp_pixpipe_params_parse (gimp_parasite_data (pipe_parasite),
                                       &gihparams);

	  if (!gih_save_dialog (image_ID))
	    status = GIMP_PDB_CANCEL;
	  break;

	case GIMP_RUN_NONINTERACTIVE:
	  if (nparams != 15)
	    {
	      status = GIMP_PDB_CALLING_ERROR;
	    }
	  else
	    {
	      info.spacing = param[5].data.d_int32;
	      strncpy (info.description, param[6].data.d_string, MAXDESCLEN);
	      info.description[MAXDESCLEN] = 0;

	      gimp_pixpipe_params_init (&gihparams);

	      gihparams.cellwidth  = param[7].data.d_int32;
	      gihparams.cellheight = param[8].data.d_int32;
	      gihparams.cols       = param[9].data.d_int8;
	      gihparams.rows       = param[10].data.d_int8;
	      gihparams.dim        = param[11].data.d_int32;
	      gihparams.ncells     = 1;

	      if (param[13].data.d_int32 != gihparams.dim)
		{
		  status = GIMP_PDB_CALLING_ERROR;
		}
	      else
		{
		  for (i = 0; i < gihparams.dim; i++)
		    {
		      gihparams.rank[i]      = param[12].data.d_int8array[i];
		      gihparams.selection[i] = g_strdup (param[14].data.d_stringarray[i]);
		      gihparams.ncells       *= gihparams.rank[i];
		    }
		}
	    }
	  break;

	case GIMP_RUN_WITH_LAST_VALS:
	  gimp_get_data ("file_gih_save", &info);
	  pipe_parasite =
	    gimp_image_parasite_find (orig_image_ID,
				      "gimp-brush-pipe-parameters");
	  gimp_pixpipe_params_init (&gihparams);
	  if (pipe_parasite)
	    gimp_pixpipe_params_parse (gimp_parasite_data (pipe_parasite),
                                       &gihparams);
	  break;
	}

      if (status == GIMP_PDB_SUCCESS)
	{
	  if (gih_save_image (param[3].data.d_string,
			      image_ID, orig_image_ID, drawable_ID))
	    {
	      gimp_set_data ("file_gih_save", &info, sizeof (info));
	    }
	  else
	    {
	      status = GIMP_PDB_EXECUTION_ERROR;
	    }
	}

      if (export == GIMP_EXPORT_EXPORT)
	gimp_image_delete (image_ID);
    }
  else
    {
      status = GIMP_PDB_CALLING_ERROR;
    }

  values[0].data.d_status = status;
}


/*  load routines  */

static gboolean
gih_load_one_brush (gint   fd,
		    gint32 image_ID)
{
  static gint    num_layers = 0;
  gchar         *name       = NULL;
  BrushHeader    bh;
  guchar        *brush_buf  = NULL;
  gint32         layer_ID;
  GimpDrawable  *drawable;
  GimpPixelRgn   pixel_rgn;
  gint           version_extra;
  gint           bn_size;
  GimpImageType  image_type;
  gint           width, height;
  gint           new_width, new_height;

  g_return_val_if_fail (fd != -1, FALSE);
  g_return_val_if_fail (image_ID != -1, FALSE);

  if (read (fd, &bh, sizeof (bh)) != sizeof (bh))
    return FALSE;

  /*  rearrange the bytes in each unsigned int  */
  bh.header_size  = g_ntohl (bh.header_size);
  bh.version      = g_ntohl (bh.version);
  bh.width        = g_ntohl (bh.width);
  bh.height       = g_ntohl (bh.height);
  bh.bytes        = g_ntohl (bh.bytes);
  bh.magic_number = g_ntohl (bh.magic_number);
  bh.spacing      = g_ntohl (bh.spacing);

  /* How much extra to add to the header seek - 1 needs a bit more */
  version_extra = 0;

  if (bh.version == 1)
    {
      /* Version 1 didn't know about spacing */
      bh.spacing = 25;
      /* And we need to rewind the handle a bit too */
      lseek (fd, -8, SEEK_CUR);
      version_extra = 8;
    }
  /* Version 1 didn't know about magic either */
  if ((bh.version != 1 &&
       (bh.magic_number != GBRUSH_MAGIC || bh.version != 2)) ||
      bh.header_size <= sizeof (bh))
    {
      return FALSE;
    }

  if ((bn_size = (bh.header_size - sizeof (bh))) > 0)
    {
      name = g_new (gchar, bn_size);
      if ((read (fd, name, bn_size)) < bn_size)
	{
	  g_message (_("Error in GIMP brush pipe file."));
	  g_free (name);
	  return FALSE;
	}
    }
  else
    {
      name = g_strdup (_("Unnamed"));
    }

  /* Now there's just raw data left. */

  brush_buf = g_malloc (bh.width * bh.height * bh.bytes);

  if (read (fd, brush_buf,
	    bh.width * bh.height * bh.bytes) != bh.width * bh.height * bh.bytes)
    {
      g_free (brush_buf);
      g_free (name);
      return FALSE;
    }


  if (bh.bytes == 1)
    {
      PatternHeader ph;

      /*  For backwards-compatibility, check if a pattern follows.
	  The obsolete .gpb format did it this way.  */

      if (read (fd, &ph, sizeof(ph)) == sizeof(ph))
	{
	  /*  rearrange the bytes in each unsigned int  */
	  ph.header_size  = g_ntohl (ph.header_size);
	  ph.version      = g_ntohl (ph.version);
	  ph.width        = g_ntohl (ph.width);
	  ph.height       = g_ntohl (ph.height);
	  ph.bytes        = g_ntohl (ph.bytes);
	  ph.magic_number = g_ntohl (ph.magic_number);

	  if (ph.magic_number == GPATTERN_MAGIC && ph.version == 1 &&
	      ph.header_size > sizeof (ph) &&
	      ph.bytes == 3 && ph.width == bh.width && ph.height == bh.height &&
	      lseek (fd, ph.header_size - sizeof (ph), SEEK_CUR) > 0)
	    {
	      guchar *plain_brush = brush_buf;
	      gint    i;

	      bh.bytes = 4;
	      brush_buf = g_malloc (4 * bh.width * bh.height);

	      for (i = 0; i < ph.width * ph.height; i++)
		{
		  if (read (fd, brush_buf + i * 4, 3) != 3)
		    {
		      g_free (name);
		      g_free (plain_brush);
		      g_free (brush_buf);
		      return FALSE;
		    }
		  brush_buf[i * 4 + 3] = plain_brush[i];
		}
	      g_free (plain_brush);
	    }
	  else if (lseek (fd, - ((off_t) sizeof (PatternHeader)), SEEK_CUR) < 0)
	    {
	      g_message (_("GIMP brush file appears to be corrupted."));
	      g_free (name);
	      g_free (brush_buf);
	      return FALSE;
	    }
	}
    }

  /*
   * Create a new layer of the proper size.
   */

  switch (bh.bytes)
    {
    case 1:
      image_type = GIMP_GRAY_IMAGE;
      break;

    case 4:
      image_type = GIMP_RGBA_IMAGE;
      if (gimp_image_base_type (image_ID) == GIMP_GRAY)
	gimp_image_convert_rgb (image_ID);
      break;

    default:
      g_message ("Unsupported brush depth: %d\nGIMP Brushes must be GRAY or RGBA\n",
		 bh.bytes);
      return FALSE;
    }

  new_width  = width  = gimp_image_width (image_ID);
  new_height = height = gimp_image_height (image_ID);

  if (bh.width > width || bh.height > height)
    {
      new_width  = MAX (width, bh.width);
      new_height = MAX (height, bh.height);
      gimp_image_resize (image_ID,
			 new_width, new_height,
			 (width - new_width) / 2, (height - new_height) / 2);
    }

  layer_ID = gimp_layer_new (image_ID, name,
			     bh.width, bh.height,
			     image_type, 100, GIMP_NORMAL_MODE);
  g_free (name);

  if (layer_ID != -1)
    {
      gimp_image_add_layer (image_ID, layer_ID, num_layers++);
      gimp_layer_set_offsets (layer_ID,
			      (new_width - bh.width)   / 2,
			      (new_height - bh.height) / 2);

      drawable = gimp_drawable_get (layer_ID);
      gimp_pixel_rgn_init (&pixel_rgn, drawable,
			   0, 0, drawable->width, drawable->height,
			   TRUE, FALSE);

      gimp_pixel_rgn_set_rect (&pixel_rgn,
                               brush_buf, 0, 0, bh.width, bh.height);

      if (image_type == GIMP_GRAY_IMAGE)
        {
          gimp_invert (layer_ID);
          gimp_layer_add_alpha (layer_ID);
        }
    }

  g_free (brush_buf);

  return TRUE;
}

static gint32
gih_load_image (const gchar *filename)
{
  gint     fd;
  gint     i;
  gint32   image_ID;
  GString *buffer;
  gchar    c;
  gchar   *name = NULL;
  gint     num_of_brushes = 0;
  gchar   *paramstring;
  GimpParasite *pipe_parasite;

  fd = g_open (filename, O_RDONLY | _O_BINARY, 0);

  if (fd == -1)
    {
      g_message (_("Could not open '%s' for reading: %s"),
                 gimp_filename_to_utf8 (filename), g_strerror (errno));
      return -1;
    }

  gimp_progress_init (NULL);
  gimp_progress_set_text (_("Opening '%s'..."),
                          gimp_filename_to_utf8 (filename));

  /* The file format starts with a painfully simple text header */

  /*  get the name  */
  buffer = g_string_new (NULL);
  while (read (fd, &c, 1) == 1 && c != '\n' && buffer->len < 1024)
    g_string_append_c (buffer, c);

  if (buffer->len > 0 && buffer->len < 1024)
    name = buffer->str;

  g_string_free (buffer, FALSE);

  if (!name)
    {
      g_message ("Couldn't read name for brush pipe from '%s'",
		 gimp_filename_to_utf8 (filename));
      close (fd);
      return -1;
    }

  /*  get the number of brushes  */
  buffer = g_string_new (NULL);
  while (read (fd, &c, 1) == 1 && c != '\n' && buffer->len < 1024)
    g_string_append_c (buffer, c);

  if (buffer->len > 0 && buffer->len < 1024)
    {
      num_of_brushes = strtol (buffer->str, &paramstring, 10);
    }

  if (num_of_brushes < 1)
    {
      g_message ("Brush pipes should have at least one brush.");
      close (fd);
      g_free (name);
      g_string_free (buffer, TRUE);
      return -1;
    }

  image_ID = gimp_image_new (1, 1, GIMP_GRAY);
  gimp_image_set_filename (image_ID, filename);

  for (i = 0; i < num_of_brushes; i++)
    {
      if (! gih_load_one_brush (fd, image_ID))
	{
	  g_message (_("Couldn't load one brush in the pipe, giving up."));
	  close (fd);
	  g_free (name);
	  g_string_free (buffer, TRUE);
	  return -1;
	}

      gimp_progress_update ((gdouble) i / (gdouble) num_of_brushes);
    }

  while (*paramstring && g_ascii_isspace (*paramstring))
    paramstring++;

  /*  Since we do not (yet) load the pipe as described in the header,
      but use one layer per brush, we have to alter the paramstring
      before attaching it as a parasite.
   */

  if (*paramstring)
    {
      gimp_pixpipe_params_parse (paramstring, &gihparams);

      gihparams.cellwidth  = gimp_image_width  (image_ID);
      gihparams.cellheight = gimp_image_height (image_ID);
      gihparams.cols       = 1;
      gihparams.rows       = 1;

      paramstring = gimp_pixpipe_params_build (&gihparams);
      if (paramstring)
	{
	  pipe_parasite = gimp_parasite_new ("gimp-brush-pipe-parameters",
					     GIMP_PARASITE_PERSISTENT,
					     strlen (paramstring) + 1,
					     paramstring);
	  gimp_image_parasite_attach (image_ID, pipe_parasite);
	  gimp_parasite_free (pipe_parasite);
	  g_free (paramstring);
	}
    }

  g_string_free (buffer, TRUE);

  return image_ID;
}

/*  save routines */

static void
size_adjustment_callback (GtkWidget *widget,
			  gpointer   data)
{
  gint  i;
  gint  size;
  gint  newn;
  gchar buf[10];
  SizeAdjustmentData *adj = (SizeAdjustmentData *) data;

  for (i = 0; i < adj->nguides; i++)
    gimp_image_delete_guide (adj->image, adj->guides[i]);

  g_free (adj->guides);
  adj->guides = NULL;
  gimp_displays_flush ();

  *(adj->value) = GTK_ADJUSTMENT (widget)->value;

  if (adj->orientation == GIMP_ORIENTATION_VERTICAL)
    {
      size = gimp_image_width (adj->image);
      newn = size / *(adj->value);
      adj->nguides = newn - 1;
      adj->guides = g_new (gint32, adj->nguides);
      for (i = 0; i < adj->nguides; i++)
	adj->guides[i] = gimp_image_add_vguide (adj->image,
						*(adj->value) * (i+1));
    }
  else
    {
      size = gimp_image_height (adj->image);
      newn = size / *(adj->value);
      adj->nguides = newn - 1;
      adj->guides = g_new (gint32, adj->nguides);
      for (i = 0; i < adj->nguides; i++)
	adj->guides[i] = gimp_image_add_hguide (adj->image,
						*(adj->value) * (i+1));
    }
  gimp_displays_flush ();
  sprintf (buf, "%2d", newn);
  gtk_label_set_text (GTK_LABEL (adj->count_label), buf);

  *(adj->count) = newn;

  if (newn * *(adj->value) != size)
    gtk_widget_show (GTK_WIDGET (adj->warning_label));
  else
    gtk_widget_hide (GTK_WIDGET (adj->warning_label));

  if (adj->ncells != NULL)
    gtk_adjustment_set_value (GTK_ADJUSTMENT (adj->ncells),
			      *(adj->other_count) * *(adj->count));
  if (adj->rank0 != NULL)
    gtk_adjustment_set_value (GTK_ADJUSTMENT (adj->rank0),
			      *(adj->other_count) * *(adj->count));
}

static void
entry_callback (GtkWidget *widget,
		gpointer   data)
{
  if (data == info.description)
    {
      strncpy (info.description,
	       gtk_entry_get_text (GTK_ENTRY (widget)), MAXDESCLEN);
      info.description[MAXDESCLEN]  = 0;
    }
}

static void
cb_callback (GtkWidget *widget,
	     gpointer   data)
{
  gint index;

  index = gtk_combo_box_get_active (GTK_COMBO_BOX (widget));

  *((const gchar **) data) = selection_modes [index];
}

static void
dim_callback (GtkAdjustment *adjustment,
              SizeAdjustmentData *data)
{
  gint i;

  gihparams.dim = RINT (adjustment->value);

  for (i = 0; i < GIMP_PIXPIPE_MAXDIM; i++)
    {
      gtk_widget_set_sensitive (data->rank_entry[i], i < gihparams.dim);
      gtk_widget_set_sensitive (data->mode_entry[i], i < gihparams.dim);
    }
}

static gboolean
gih_save_dialog (gint32 image_ID)
{
  GtkWidget *dlg;
  GtkWidget *table;
  GtkWidget *dimtable;
  GtkWidget *label;
  GtkObject *adjustment;
  GtkWidget *spinbutton;
  GtkWidget *entry;
  GtkWidget *box;
  GtkWidget *cb;
  gint       i;
  gchar      buffer[100];
  SizeAdjustmentData cellw_adjust;
  SizeAdjustmentData cellh_adjust;
  gint32    *layer_ID;
  gint32     nlayers;
  gboolean   run;

  dlg = gimp_dialog_new (_("Save as Brush Pipe"), "gih",
                         NULL, 0,
			 gimp_standard_help_func, "file-gih-save",

			 GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
			 GTK_STOCK_OK,     GTK_RESPONSE_OK,

			 NULL);

  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dlg),
                                              GTK_RESPONSE_OK,
                                              GTK_RESPONSE_CANCEL,
                                              -1);

  /* The main table */
  table = gtk_table_new (8, 2, FALSE);
  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
  gtk_container_set_border_width (GTK_CONTAINER (table), 12);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), table, TRUE, TRUE, 0);
  gtk_widget_show (table);

  /*
   * Spacing: __
   */
  spinbutton = gimp_spin_button_new (&adjustment, info.spacing,
				     1, 1000, 1, 10, 10, 1, 0);
  gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
			     _("Spacing (percent):"), 0.0, 0.5,
			     spinbutton, 1, TRUE);

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (gimp_int_adjustment_update),
                    &info.spacing);

  /*
   * Description: ___________
   */
  entry = gtk_entry_new ();
  gtk_widget_set_size_request (entry, 200, -1);
  gtk_entry_set_text (GTK_ENTRY (entry), info.description);
  gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
			     _("Description:"), 0.0, 0.5,
			     entry, 1, FALSE);

  g_signal_connect (entry, "changed",
                    G_CALLBACK (entry_callback),
                    info.description);

  /*
   * Cell size: __ x __ pixels
   */
  box = gtk_hbox_new (FALSE, 4);

  spinbutton = gimp_spin_button_new (&adjustment,
				     gihparams.cellwidth,
				     2, gimp_image_width (image_ID), 1, 1, 1,
				     1, 0);
  gtk_box_pack_start (GTK_BOX (box), spinbutton, FALSE, FALSE, 0);
  gtk_widget_show (spinbutton);

  layer_ID = gimp_image_get_layers (image_ID, &nlayers);
  cellw_adjust.orientation = GIMP_ORIENTATION_VERTICAL;
  cellw_adjust.image       = image_ID;
  cellw_adjust.toplayer    = layer_ID[nlayers-1];
  cellw_adjust.nguides     = 0;
  cellw_adjust.guides      = NULL;
  cellw_adjust.value       = &gihparams.cellwidth;

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (size_adjustment_callback),
                    &cellw_adjust);

  label = gtk_label_new ("x");
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  spinbutton = gimp_spin_button_new (&adjustment,
				     gihparams.cellheight,
				     2, gimp_image_height (image_ID), 1, 1, 1,
				     1, 0);
  gtk_box_pack_start (GTK_BOX (box), spinbutton, FALSE, FALSE, 0);
  gtk_widget_show (spinbutton);

  cellh_adjust.orientation = GIMP_ORIENTATION_HORIZONTAL;
  cellh_adjust.image       = image_ID;
  cellh_adjust.toplayer    = layer_ID[nlayers-1];
  cellh_adjust.nguides     = 0;
  cellh_adjust.guides      = NULL;
  cellh_adjust.value       = &gihparams.cellheight;

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (size_adjustment_callback),
                    &cellh_adjust);

  label = gtk_label_new ( _("Pixels"));
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
			     _("Cell size:"), 0.0, 0.5,
			     box, 1, FALSE);

  g_free (layer_ID);

  /*
   * Number of cells: ___
   */
  spinbutton = gimp_spin_button_new (&adjustment,
				     gihparams.ncells, 1, 1000, 1, 10, 10,
				     1, 0);
  gimp_table_attach_aligned (GTK_TABLE (table), 0, 3,
			     _("Number of cells:"), 0.0, 0.5,
			     spinbutton, 1, TRUE);

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (gimp_int_adjustment_update),
                    &gihparams.ncells);

  if (gihparams.dim == 1)
    cellw_adjust.ncells = cellh_adjust.ncells = adjustment;
  else
    cellw_adjust.ncells = cellh_adjust.ncells = NULL;

  /*
   * Display as: __ rows x __ cols
   */
  box = gtk_hbox_new (FALSE, 0);

  g_snprintf (buffer, sizeof (buffer), "%2d", gihparams.rows);
  label = gtk_label_new (buffer);
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  cellh_adjust.count_label = label;
  cellh_adjust.count       = &gihparams.rows;
  cellh_adjust.other_count = &gihparams.cols;
  gtk_widget_show (label);

  label = gtk_label_new (_(" Rows of "));
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  g_snprintf (buffer, sizeof (buffer), "%2d", gihparams.cols);
  label = gtk_label_new (buffer);
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  cellw_adjust.count_label = label;
  cellw_adjust.count       = &gihparams.cols;
  cellw_adjust.other_count = &gihparams.rows;
  gtk_widget_show (label);

  label = gtk_label_new (_(" Columns on each layer"));
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  label = gtk_label_new (_(" (Width Mismatch!) "));
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  cellw_adjust.warning_label = label;

  label = gtk_label_new (_(" (Height Mismatch!) "));
  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
  cellh_adjust.warning_label = label;

  gimp_table_attach_aligned (GTK_TABLE (table), 0, 4,
			     _("Display as:"), 0.0, 0.5,
			     box, 1, FALSE);

  /*
   * Dimension: ___
   */
  spinbutton = gimp_spin_button_new (&adjustment, gihparams.dim,
				     1, GIMP_PIXPIPE_MAXDIM, 1, 1, 1, 1, 0);
  gimp_table_attach_aligned (GTK_TABLE (table), 0, 5,
			     _("Dimension:"), 0.0, 0.5,
			     spinbutton, 1, TRUE);

  g_signal_connect (adjustment, "value-changed",
                    G_CALLBACK (dim_callback),
                    &cellw_adjust);

  /*
   * Ranks / Selection: ______ ______ ______ ______ ______
   */

  dimtable = gtk_table_new (2, GIMP_PIXPIPE_MAXDIM, FALSE);
  gtk_table_set_col_spacings (GTK_TABLE (dimtable), 4);
  for (i = 0; i < GIMP_PIXPIPE_MAXDIM; i++)
    {
      gint j;

      spinbutton = gimp_spin_button_new (&adjustment,
					 gihparams.rank[i], 1, 100, 1, 1, 1,
					 1, 0);
      gtk_table_attach (GTK_TABLE (dimtable), spinbutton, 0, 1, i, i + 1,
			GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);

      gtk_widget_show (spinbutton);

      if (i >= gihparams.dim)
        gtk_widget_set_sensitive (spinbutton, FALSE);

      g_signal_connect (adjustment, "value-changed",
                        G_CALLBACK (gimp_int_adjustment_update),
                        &gihparams.rank[i]);

      cellw_adjust.rank_entry[i] = cellh_adjust.rank_entry[i] = spinbutton;

      if (i == 0)
	{
	  if (gihparams.dim == 1)
	    cellw_adjust.rank0 = cellh_adjust.rank0 = adjustment;
	  else
	    cellw_adjust.rank0 = cellh_adjust.rank0 = NULL;
	}
      

      cb = gtk_combo_box_new_text ();

      for (j = 0; j < G_N_ELEMENTS (selection_modes); j++)
        gtk_combo_box_append_text (GTK_COMBO_BOX (cb), selection_modes[j]);

      gtk_combo_box_set_active (GTK_COMBO_BOX (cb), 2);  /* random */

      if (gihparams.selection[i])
        for (j = 0; j < G_N_ELEMENTS (selection_modes); j++)
          if (!strcmp (gihparams.selection[i], selection_modes[j]))
            {
              gtk_combo_box_set_active (GTK_COMBO_BOX (cb), j);
              break;
            }
        

      gtk_table_attach (GTK_TABLE (dimtable), cb, 1, 2, i, i + 1,
			GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);

      gtk_widget_show (cb);

      if (i >= gihparams.dim)
        gtk_widget_set_sensitive (cb, FALSE);

      g_signal_connect (GTK_COMBO_BOX (cb), "changed",
                        G_CALLBACK (cb_callback),
                        &gihparams.selection[i]);

      cellw_adjust.mode_entry[i] = cellh_adjust.mode_entry[i] = cb;


    }

  gimp_table_attach_aligned (GTK_TABLE (table), 0, 6,
			     _("Ranks:"), 0.0, 0.0,
			     dimtable, 1, FALSE);

  gtk_widget_show (dlg);

  run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);

  if (run)
    {
      gint i;

      for (i = 0; i < GIMP_PIXPIPE_MAXDIM; i++)
        gihparams.selection[i] = g_strdup (gihparams.selection[i]);

      /* Fix up bogus values */
      gihparams.ncells =
	MIN (gihparams.ncells,
	     num_useable_layers * gihparams.rows * gihparams.cols);
    }

  gtk_widget_destroy (dlg);

  for (i = 0; i < cellw_adjust.nguides; i++)
    gimp_image_delete_guide (image_ID, cellw_adjust.guides[i]);
  for (i = 0; i < cellh_adjust.nguides; i++)
    gimp_image_delete_guide (image_ID, cellh_adjust.guides[i]);

  return run;
}

static gboolean
gih_save_one_brush (gint          fd,
		    GimpPixelRgn *pixel_rgn,
		    gchar        *name)
{
  BrushHeader  header;
  guint        x;
  guint        y;
  guchar      *buffer;

  g_return_val_if_fail (fd != -1, FALSE);
  g_return_val_if_fail (pixel_rgn != NULL, FALSE);

  if (!name)
    name = g_strdup (_("Unnamed"));

  if (pixel_rgn->bpp != 2 && pixel_rgn->bpp != 4)
    {
      g_free (name);
      return FALSE;
    }

  if (pixel_rgn->w < 1 || pixel_rgn->h < 1)
    {
      g_free (name);
      return FALSE;
    }

  header.header_size  =
    g_htonl (sizeof (header) + strlen (name) + 1);
  header.version      = g_htonl (2);
  header.width        = g_htonl (pixel_rgn->w);
  header.height       = g_htonl (pixel_rgn->h);
  header.bytes        = g_htonl (pixel_rgn->bpp == 2 ? 1 : 4);
  header.magic_number = g_htonl (GBRUSH_MAGIC);
  header.spacing      = g_htonl (info.spacing);

  if (write (fd, &header, sizeof (header)) != sizeof (header))
    return FALSE;

  if (write (fd, name, strlen (name) + 1) !=
      strlen (name) + 1)
    {
      g_free (name);
      return FALSE;
    }

  g_free (name);

  buffer = g_malloc (pixel_rgn->w * pixel_rgn->bpp);

  for (y = 0; y < pixel_rgn->h; y++)
    {
      gimp_pixel_rgn_get_row (pixel_rgn, buffer,
			      0 + pixel_rgn->x, y + pixel_rgn->y,
			      pixel_rgn->w);

      if (pixel_rgn->bpp == 2) /* GRAYA */
	{
	  for (x = 0; x < pixel_rgn->w; x++)
	    {
	      guchar value = 255 - buffer[2 * x];

	      if (write (fd, &value, 1) != 1)
		{
		  g_free (buffer);
		  return FALSE;
		}
	    }
	}
      else if (pixel_rgn->bpp == 4) /* RGBA */
	{
	  if (write (fd, buffer, pixel_rgn->w * pixel_rgn->bpp) !=
	      pixel_rgn->w * pixel_rgn->bpp)
	    {
	      g_free (buffer);
	      return FALSE;
	    }
	}
    }

  g_free (buffer);

  return TRUE;
}

static gboolean
gih_save_image (const gchar *filename,
		gint32       image_ID,
		gint32       orig_image_ID,
		gint32       drawable_ID)
{
  GimpDrawable *drawable;
  GimpPixelRgn  pixel_rgn;
  GimpParasite *pipe_parasite;
  gchar *header;
  gchar *msg, *parstring;
  gint32 *layer_ID;
  gint fd;
  gint nlayers, layer, row, col;
  gint imagew, imageh, offsetx, offsety;
  gint k, x, y, thisx, thisy, xnext, ynext, thisw, thish;

  if (gihparams.ncells < 1)
    return FALSE;

  imagew = gimp_image_width (image_ID);
  imageh = gimp_image_height (image_ID);
  gimp_tile_cache_size (gimp_tile_height () * imagew * 4);

  fd = g_open (filename, O_CREAT | O_TRUNC | O_WRONLY | _O_BINARY, 0644);

  if (fd == -1)
    {
      g_message (_("Could not open '%s' for writing: %s"),
                 gimp_filename_to_utf8 (filename), g_strerror (errno));
      return FALSE;
    }

  msg = g_strdup_printf (_("Saving '%s'..."),
                         gimp_filename_to_utf8 (filename));
  gimp_progress_init (msg);
  g_free (msg);

  parstring = gimp_pixpipe_params_build (&gihparams);

  header = g_strdup_printf ("%s\n%d %s\n",
			    info.description, gihparams.ncells, parstring);

  if (write (fd, header, strlen (header)) != strlen (header))
    {
      g_free (header);
      g_free (parstring);
      close (fd);
      return FALSE;
    }

  g_free (header);

  pipe_parasite = gimp_parasite_new ("gimp-brush-pipe-parameters",
				     GIMP_PARASITE_PERSISTENT,
				     strlen (parstring) + 1, parstring);
  gimp_image_parasite_attach (orig_image_ID, pipe_parasite);
  gimp_parasite_free (pipe_parasite);

  g_free (parstring);

  layer_ID = gimp_image_get_layers (image_ID, &nlayers);

  k = 0;
  for (layer = 0; layer < nlayers; layer++)
    {
      if (!gimp_drawable_has_alpha (layer_ID[layer]))
	continue;

      drawable = gimp_drawable_get (layer_ID[layer]);
      gimp_drawable_offsets (layer_ID[layer], &offsetx, &offsety);

      for (row = 0; row < gihparams.rows; row++)
	{
	  y = (row * imageh) / gihparams.rows ;
	  ynext = ((row + 1) * imageh / gihparams.rows);
	  /* Assume layer is offset to positive direction in x and y.
	   * That's reasonable, as otherwise all of the layer
	   * won't be visible.
	   * thisy and thisx are in the drawable's coordinate space.
	   */
	  thisy = MAX (0, y - offsety);
	  thish = (ynext - offsety) - thisy;
	  thish = MIN (thish, drawable->height - thisy);

	  for (col = 0; col < gihparams.cols; col++)
	    {
	      x = (col * imagew / gihparams.cols);
	      xnext = ((col + 1) * imagew / gihparams.cols);
	      thisx = MAX (0, x - offsetx);
	      thisw = (xnext - offsetx) - thisx;
	      thisw = MIN (thisw, drawable->width - thisx);
	      gimp_pixel_rgn_init (&pixel_rgn, drawable, thisx, thisy,
				   thisw, thish, FALSE, FALSE);

	      if (! gih_save_one_brush (fd, &pixel_rgn,
					gimp_drawable_get_name (layer_ID[layer])))
		{
		  close (fd);
		  return FALSE;
		}

	      k++;
	      gimp_progress_update ((gdouble) k / gihparams.ncells);
	    }
	}

    }

  gimp_progress_update (1.0);

  close (fd);

  return TRUE;
}