/* 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 <stdlib.h>
#include <string.h>
#include <stdio.h>

#include <gtk/gtk.h>

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

#include "libgimp/stdplugins-intl.h"

/* Declare some local functions.
 */
static void   query      (void);
static void   run        (gchar   *name,
                          gint     nparams,
                          GParam  *param,
                          gint    *nreturn_vals,
                          GParam **return_vals);
static void   init_gtk   (void);
static gint   save_image (gchar   *filename,
			  gint32   image_ID,
			  gint32   drawable_ID);


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


MAIN ()

static void
query (void)
{
  static GParamDef save_args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive, non-interactive" },
    { PARAM_IMAGE, "image", "Input image" },
    { PARAM_DRAWABLE, "drawable", "Drawable to save" },
    { PARAM_STRING, "filename", "The name of the file to save the image in" },
    { PARAM_STRING, "raw_filename", "The name of the file to save the image in" },
  };
  static gint nsave_args = sizeof (save_args) / sizeof (save_args[0]);

  gimp_install_procedure ("file_header_save",
                          "saves files as C unsigned character array",
                          "FIXME: write help",
                          "Spencer Kimball & Peter Mattis",
                          "Spencer Kimball & Peter Mattis",
                          "1997",
                          "<Save>/Header",
			  "INDEXED, RGB",
                          PROC_PLUG_IN,
                          nsave_args, 0,
                          save_args, NULL);

  gimp_register_save_handler ("file_header_save",
			      "h",
			      "");
}

static void
run (gchar   *name,
     gint     nparams,
     GParam  *param,
     gint    *nreturn_vals,
     GParam **return_vals)
{
  static GParam values[2];
  GRunModeType  run_mode;
  GStatusType   status = STATUS_SUCCESS;
  gint32        image_ID;
  gint32        drawable_ID;
  GimpExportReturnType export = EXPORT_CANCEL;

  run_mode = param[0].data.d_int32;

  *nreturn_vals = 1;
  *return_vals  = values;
  values[0].type          = PARAM_STATUS;
  values[0].data.d_status = STATUS_EXECUTION_ERROR;

  if (strcmp (name, "file_header_save") == 0)
    {
      image_ID    = param[1].data.d_int32;
      drawable_ID = param[2].data.d_int32;

      /*  eventually export the image */ 
      switch (run_mode)
	{
	case RUN_INTERACTIVE:
	case RUN_WITH_LAST_VALS:
	  INIT_I18N_UI();
	  init_gtk ();
	  export = gimp_export_image (&image_ID, &drawable_ID, "Header", 
				      (CAN_HANDLE_RGB |
				       CAN_HANDLE_INDEXED));
	  if (export == EXPORT_CANCEL)
	    {
	      values[0].data.d_status = STATUS_CANCEL;
	      return;
	    }
	  break;
	default:
	  break;
	}

      if (! save_image (param[3].data.d_string, image_ID, drawable_ID))
	{
	  status = STATUS_EXECUTION_ERROR;
	}

      if (export == EXPORT_EXPORT)
	gimp_image_delete (image_ID);
    }
  else
    {
      status = STATUS_CALLING_ERROR;
    }

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

static void 
init_gtk (void)
{
  gchar **argv;
  gint    argc;

  argc    = 1;
  argv    = g_new (gchar *, 1);
  argv[0] = g_strdup ("header");

  gtk_init (&argc, &argv);
  gtk_rc_parse (gimp_gtkrc ());
}

static int
save_image (gchar  *filename,
	    gint32  image_ID,
	    gint32  drawable_ID)
{
  GPixelRgn pixel_rgn;
  GDrawable *drawable;
  GDrawableType drawable_type;
  FILE *fp;
  gint x, y, b, c;
  gchar *backslash = "\\\\";
  gchar *quote = "\\\"";
  gchar *newline = "\"\n\t\"";
  gchar buf[4];
  guchar *d = NULL;
  guchar *data;
  guchar *cmap;
  gint colors;

  if ((fp = fopen (filename, "w")) == NULL)
    return FALSE;

  drawable = gimp_drawable_get (drawable_ID);
  drawable_type = gimp_drawable_type (drawable_ID);
  gimp_pixel_rgn_init (&pixel_rgn, drawable,
		       0, 0, drawable->width, drawable->height, FALSE, FALSE);

  fprintf (fp, "/*  GIMP header image file format (%s): %s  */\n\n",
	   RGB_IMAGE == drawable_type ? "RGB" : "INDEXED", filename);
  fprintf (fp, "static unsigned int width = %d;\n", drawable->width);
  fprintf (fp, "static unsigned int height = %d;\n\n", drawable->height);
  fprintf (fp, "/*  Call this macro repeatedly.  After each use, the pixel data can be extracted  */\n\n");
  switch (drawable_type)
    {
    case RGB_IMAGE:
      fprintf (fp, "#define HEADER_PIXEL(data,pixel) {\\\n  pixel[0] = (((data[0] - 33) << 2) | ((data[1] - 33) >> 4)); \\\n  pixel[1] = ((((data[1] - 33) & 0xF) << 4) | ((data[2] - 33) >> 2)); \\\n  pixel[2] = ((((data[2] - 33) & 0x3) << 6) | ((data[3] - 33))); \\\n  data += 4;\n}\n");
      fprintf (fp, "static char *header_data =\n\t\"");

      data = g_new (guchar, drawable->width * drawable->bpp);

      c = 0;
      for (y = 0; y < drawable->height; y++)
	{
	  gimp_pixel_rgn_get_row (&pixel_rgn, data, 0, y, drawable->width);
	  for (x = 0; x < drawable->width; x++)
	    {
	      d = data + x * drawable->bpp;
	      
	      buf[0] = ((d[0] >> 2) & 0x3F) + 33;
	      buf[1] = ((((d[0] & 0x3) << 4) | (d[1] >> 4)) & 0x3F) + 33;
	      buf[2] = ((((d[1] & 0xF) << 2) | (d[2] >> 6)) & 0x3F) + 33;
	      buf[3] = (d[2] & 0x3F) + 33;
	      
	      for (b = 0; b < 4; b++)
		if (buf[b] == '"')
		  fwrite (quote, 1, 2, fp);
		else if (buf[b] == '\\')
		  fwrite (backslash, 1, 2, fp);
		else
		  fwrite (buf + b, 1, 1, fp);
	      
	      c++;
	      if (c >= 16)
		{
		  fwrite (newline, 1, 4, fp);
		  c = 0;
		}
	    }
	}
      fprintf (fp, "\";\n");
      break;

    case INDEXED_IMAGE:
      fprintf (fp, "#define HEADER_PIXEL(data,pixel) {\\\n  pixel[0] = header_data_cmap[(unsigned char)data[0]][0]; \\\n  pixel[1] = header_data_cmap[(unsigned char)data[0]][1]; \\\n  pixel[2] = header_data_cmap[(unsigned char)data[0]][2]; \\\n  data ++; }\n\n");
      /* save colormap */
      cmap = gimp_image_get_cmap (image_ID, &colors);

      fprintf (fp, "static char header_data_cmap[256][3] = {");
      fprintf(fp, "\n\t{%3d,%3d,%3d}", (int)cmap[0], (int)cmap[1], (int)cmap[2]);
      for (c = 1; c < colors; c++)
        fprintf(fp, ",\n\t{%3d,%3d,%3d}", (int)cmap[3*c], (int)cmap[3*c+1], (int)cmap[3*c+2]);
      /* fill the rest */
      for ( ; c < 256; c++)
        fprintf(fp, ",\n\t{255,255,255}");
      /* close bracket */
      fprintf(fp, "\n\t};\n");
      g_free(cmap);

      /* save image */
      fprintf (fp, "static char header_data[] = {\n\t");

      data = g_new (guchar, drawable->width * drawable->bpp);

      c = 0;
      for (y = 0; y < drawable->height; y++)
        {
          gimp_pixel_rgn_get_row (&pixel_rgn, data, 0, y, drawable->width);
          for (x = 0; x < drawable->width-1; x++)
	    {
	      d = data + x * drawable->bpp;

              fprintf(fp, "%d,", (int)d[0]);

	      c++;
	      if (c >= 16)
	        {
	          fprintf (fp, "\n\t");
	          c = 0;
	        }
	    }

          if (y != drawable->height - 1)
            fprintf(fp, "%d,\n\t", (int)d[1]);
          else
            fprintf(fp, "%d\n\t", (int)d[1]);
          c = 0; /* reset line counter */
        }
      fprintf (fp, "};\n");
      break;
    default:
      g_warning ("unhandled drawable type (%d)", drawable_type);
      return FALSE;
    } /* switch (drawable_type) */

  fclose (fp);

  g_free (data);
  gimp_drawable_detach (drawable);

  return TRUE;
}