gimp/plug-ins/file-jpeg/jpeg.c

/* GIMP - The GNU 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 <setjmp.h>
#include <string.h>

#include <jpeglib.h>
#include <jerror.h>

#ifdef HAVE_EXIF
#include <libexif/exif-data.h>
#endif /* HAVE_EXIF */

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

#include "libgimp/stdplugins-intl.h"

#include "jpeg.h"
#include "jpeg-settings.h"
#include "jpeg-load.h"
#include "jpeg-save.h"
#include "gimpexif.h"


/* Declare local functions.
 */

static void  query (void);
static void  run   (const gchar      *name,
                    gint              nparams,
                    const GimpParam  *param,
                    gint             *nreturn_vals,
                    GimpParam       **return_vals);

gboolean         undo_touched;
gboolean         load_interactive;
gchar           *image_comment;
gint32           display_ID;
JpegSaveVals     jsvals;
gint32           orig_image_ID_global;
gint32           drawable_ID_global;
gboolean         has_metadata;
gint             orig_quality;
JpegSubsampling  orig_subsmp;
gint             num_quant_tables;


#ifdef HAVE_EXIF
ExifData        *exif_data = NULL;
#endif

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


MAIN ()


static void
query (void)
{
  static const GimpParamDef 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 const GimpParamDef load_return_vals[] =
  {
    { GIMP_PDB_IMAGE,   "image",         "Output image" }
  };

#ifdef HAVE_EXIF

  static const GimpParamDef thumb_args[] =
  {
    { GIMP_PDB_STRING, "filename",     "The name of the file to load"  },
    { GIMP_PDB_INT32,  "thumb-size",   "Preferred thumbnail size"      }
  };
  static const GimpParamDef thumb_return_vals[] =
  {
    { GIMP_PDB_IMAGE,  "image",        "Thumbnail image"               },
    { GIMP_PDB_INT32,  "image-width",  "Width of full-sized image"     },
    { GIMP_PDB_INT32,  "image-height", "Height of full-sized image"    }
  };

#endif /* HAVE_EXIF */

  static const GimpParamDef 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 image in" },
    { GIMP_PDB_STRING,   "raw-filename", "The name of the file to save the image in" },
    { GIMP_PDB_FLOAT,    "quality",      "Quality of saved image (0 <= quality <= 1)" },
    { GIMP_PDB_FLOAT,    "smoothing",    "Smoothing factor for saved image (0 <= smoothing <= 1)" },
    { GIMP_PDB_INT32,    "optimize",     "Optimization of entropy encoding parameters (0/1)" },
    { GIMP_PDB_INT32,    "progressive",  "Enable progressive jpeg image loading (0/1)" },
    { GIMP_PDB_STRING,   "comment",      "Image comment" },
    { GIMP_PDB_INT32,    "subsmp",       "The subsampling option number" },
    { GIMP_PDB_INT32,    "baseline",     "Force creation of a baseline JPEG (non-baseline JPEGs can't be read by all decoders) (0/1)" },
    { GIMP_PDB_INT32,    "restart",      "Frequency of restart markers (in rows, 0 = no restart markers)" },
    { GIMP_PDB_INT32,    "dct",          "DCT algorithm to use (speed/quality tradeoff)" }
  };

  gimp_install_procedure (LOAD_PROC,
                          "loads files in the JPEG file format",
                          "loads files in the JPEG file format",
                          "Spencer Kimball, Peter Mattis & others",
                          "Spencer Kimball & Peter Mattis",
                          "1995-2007",
                          N_("JPEG image"),
                          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/jpeg");
  gimp_register_magic_load_handler (LOAD_PROC,
                                    "jpg,jpeg,jpe",
                                    "",
                                    "6,string,JFIF,6,string,Exif");

#ifdef HAVE_EXIF

  gimp_install_procedure (LOAD_THUMB_PROC,
                          "Loads a thumbnail from a JPEG image",
                          "Loads a thumbnail from a JPEG image (only if it exists)",
                          "Mukund Sivaraman <muks@mukund.org>, Sven Neumann <sven@gimp.org>",
                          "Mukund Sivaraman <muks@mukund.org>, Sven Neumann <sven@gimp.org>",
                          "November 15, 2004",
                          NULL,
                          NULL,
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (thumb_args),
                          G_N_ELEMENTS (thumb_return_vals),
                          thumb_args, thumb_return_vals);

  gimp_register_thumbnail_loader (LOAD_PROC, LOAD_THUMB_PROC);

#endif /* HAVE_EXIF */

  gimp_install_procedure (SAVE_PROC,
                          "saves files in the JPEG file format",
                          "saves files in the lossy, widely supported JPEG format",
                          "Spencer Kimball, Peter Mattis & others",
                          "Spencer Kimball & Peter Mattis",
                          "1995-2007",
                          N_("JPEG image"),
                          "RGB*, GRAY*",
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (save_args), 0,
                          save_args, NULL);

  gimp_register_file_handler_mime (SAVE_PROC, "image/jpeg");
  gimp_register_save_handler (SAVE_PROC, "jpg,jpeg,jpe", "");
}

static void
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
{
  static GimpParam   values[4];
  GimpRunMode        run_mode;
  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
  gint32             image_ID;
  gint32             drawable_ID;
  gint32             orig_image_ID;
  GimpParasite      *parasite;
  GimpExportReturn   export = GIMP_EXPORT_CANCEL;
  GError            *error  = NULL;

  run_mode = param[0].data.d_int32;

  INIT_I18N ();

  *nreturn_vals = 1;
  *return_vals  = values;
  values[0].type          = GIMP_PDB_STATUS;
  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;

  preview_image_ID = -1;
  preview_layer_ID = -1;

  has_metadata = FALSE;
  orig_quality = 0;
  orig_subsmp = JPEG_SUPSAMPLING_2x2_1x1_1x1;
  num_quant_tables = 0;

  if (strcmp (name, LOAD_PROC) == 0)
    {
      switch (run_mode)
        {
        case GIMP_RUN_INTERACTIVE:
        case GIMP_RUN_WITH_LAST_VALS:
          gimp_ui_init (PLUG_IN_BINARY, FALSE);
          load_interactive = TRUE;
          break;
        default:
          load_interactive = FALSE;
          break;
        }

      image_ID = load_image (param[1].data.d_string, run_mode, FALSE, &error);

      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;
        }

    }

#ifdef HAVE_EXIF

  else if (strcmp (name, LOAD_THUMB_PROC) == 0)
    {
      if (nparams < 2)
        {
          status = GIMP_PDB_CALLING_ERROR;
        }
      else
        {
          const gchar *filename = param[0].data.d_string;
          gint         width    = 0;
          gint         height   = 0;

          image_ID = load_thumbnail_image (filename, &width, &height, &error);

          if (image_ID != -1)
            {
              *nreturn_vals = 4;
              values[1].type         = GIMP_PDB_IMAGE;
              values[1].data.d_image = image_ID;
              values[2].type         = GIMP_PDB_INT32;
              values[2].data.d_int32 = width;
              values[3].type         = GIMP_PDB_INT32;
              values[3].data.d_int32 = height;
            }
          else
            {
              status = GIMP_PDB_EXECUTION_ERROR;
            }
        }
    }

#endif /* HAVE_EXIF */

  else if (strcmp (name, SAVE_PROC) == 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 (PLUG_IN_BINARY, FALSE);
          export = gimp_export_image (&image_ID, &drawable_ID, "JPEG",
                                      (GIMP_EXPORT_CAN_HANDLE_RGB |
                                       GIMP_EXPORT_CAN_HANDLE_GRAY));
          switch (export)
            {
            case GIMP_EXPORT_EXPORT:
              {
                gchar *tmp = g_filename_from_utf8 (_("Export Preview"), -1,
                                                   NULL, NULL, NULL);
                if (tmp)
                  {
                    gimp_image_set_filename (image_ID, tmp);
                    g_free (tmp);
                  }

                display_ID = -1;
              }
              break;
            case GIMP_EXPORT_IGNORE:
              break;
            case GIMP_EXPORT_CANCEL:
              values[0].data.d_status = GIMP_PDB_CANCEL;
              return;
              break;
            }
          break;
        default:
          break;
        }

      g_free (image_comment);
      image_comment = NULL;

      parasite = gimp_image_parasite_find (orig_image_ID, "gimp-comment");
      if (parasite)
        {
          image_comment = g_strndup (gimp_parasite_data (parasite),
                                     gimp_parasite_data_size (parasite));
          gimp_parasite_free (parasite);
        }

      parasite = gimp_image_parasite_find (orig_image_ID, "gimp-metadata");
      if (parasite)
        {
          has_metadata = TRUE;
          gimp_parasite_free (parasite);
        }

#ifdef HAVE_EXIF

      exif_data = gimp_metadata_generate_exif (orig_image_ID);
      if (exif_data)
        jpeg_setup_exif_for_save (exif_data, orig_image_ID);

#endif /* HAVE_EXIF */

      load_save_defaults ();

      switch (run_mode)
        {
        case GIMP_RUN_NONINTERACTIVE:
          /*  Make sure all the arguments are there!  */
          /*  pw - added two more progressive and comment */
          /*  sg - added subsampling, preview, baseline, restarts and DCT */
          if (nparams != 14)
            {
              status = GIMP_PDB_CALLING_ERROR;
            }
          else
            {
              /* Once the PDB gets default parameters, remove this hack */
              if (param[5].data.d_float > 0.05)
                {
                  jsvals.quality     = 100.0 * param[5].data.d_float;
                  jsvals.smoothing   = param[6].data.d_float;
                  jsvals.optimize    = param[7].data.d_int32;
                  jsvals.progressive = param[8].data.d_int32;
                  jsvals.baseline    = param[11].data.d_int32;
                  jsvals.subsmp      = param[10].data.d_int32;
                  jsvals.restart     = param[12].data.d_int32;
                  jsvals.dct         = param[13].data.d_int32;

                  /* free up the default -- wasted some effort earlier */
                  g_free (image_comment);
                  image_comment = g_strdup (param[9].data.d_string);
                }

              jsvals.preview = FALSE;

              if (jsvals.quality < 0.0 || jsvals.quality > 100.0)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.smoothing < 0.0 || jsvals.smoothing > 1.0)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.subsmp < 0 || jsvals.subsmp > 3)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.dct < 0 || jsvals.dct > 2)
                status = GIMP_PDB_CALLING_ERROR;
            }
          break;

        case GIMP_RUN_INTERACTIVE:
        case GIMP_RUN_WITH_LAST_VALS:
          /* restore the values found when loading the file (if available) */
          jpeg_restore_original_settings (orig_image_ID,
                                          &orig_quality,
                                          &orig_subsmp,
                                          &num_quant_tables);

          /* load up the previously used values (if file was saved once) */
          parasite = gimp_image_parasite_find (orig_image_ID,
                                               "jpeg-save-options");
          if (parasite)
            {
              const JpegSaveVals *save_vals = gimp_parasite_data (parasite);

              jsvals.quality          = save_vals->quality;
              jsvals.smoothing        = save_vals->smoothing;
              jsvals.optimize         = save_vals->optimize;
              jsvals.progressive      = save_vals->progressive;
              jsvals.baseline         = save_vals->baseline;
              jsvals.subsmp           = save_vals->subsmp;
              jsvals.restart          = save_vals->restart;
              jsvals.dct              = save_vals->dct;
              jsvals.preview          = save_vals->preview;
              jsvals.save_exif        = save_vals->save_exif;
              jsvals.save_thumbnail   = save_vals->save_thumbnail;
              jsvals.save_xmp         = save_vals->save_xmp;
              jsvals.use_orig_quality = save_vals->use_orig_quality;

              gimp_parasite_free (parasite);
            }
          else
            {
              /* We are called with GIMP_RUN_WITH_LAST_VALS but this image
               * doesn't have a "jpeg-save-options" parasite. It's better
               * to prompt the user with a dialog now so that she has control
               * over the JPEG encoding parameters.
               */
              run_mode = GIMP_RUN_INTERACTIVE;

              /* If this image was loaded from a JPEG file and has not been
               * saved yet, try to use some of the settings from the
               * original file if they are better than the default values.
               */
              if (orig_quality > jsvals.quality)
                {
                  jsvals.quality = orig_quality;
                  jsvals.use_orig_quality = TRUE;
                }

              if (orig_subsmp == JPEG_SUPSAMPLING_1x1_1x1_1x1 ||
                  ((gint) orig_subsmp > 0 &&
                   jsvals.subsmp == JPEG_SUPSAMPLING_1x1_1x1_1x1))
                {
                  jsvals.subsmp = orig_subsmp;
                }
            }
          break;
        }

      if (run_mode == GIMP_RUN_INTERACTIVE)
        {
          if (jsvals.preview)
            {
              /* we freeze undo saving so that we can avoid sucking up
               * tile cache with our unneeded preview steps. */
              gimp_image_undo_freeze (image_ID);

              undo_touched = TRUE;
            }

          /* prepare for the preview */
          preview_image_ID = image_ID;
          orig_image_ID_global = orig_image_ID;
          drawable_ID_global = drawable_ID;

          /*  First acquire information with a dialog  */
          status = (save_dialog () ? GIMP_PDB_SUCCESS : GIMP_PDB_CANCEL);

          if (undo_touched)
            {
              /* thaw undo saving and flush the displays to have them
               * reflect the current shortcuts */
              gimp_image_undo_thaw (image_ID);
              gimp_displays_flush ();
            }
        }

      if (status == GIMP_PDB_SUCCESS)
        {
          if (! save_image (param[3].data.d_string,
                            image_ID, drawable_ID, orig_image_ID, FALSE,
                            &error))
            {
              status = GIMP_PDB_EXECUTION_ERROR;
            }
        }

      if (export == GIMP_EXPORT_EXPORT)
        {
          /* If the image was exported, delete the new display. */
          /* This also deletes the image.                       */

          if (display_ID != -1)
            gimp_display_delete (display_ID);
          else
            gimp_image_delete (image_ID);
        }

      /* pw - now we need to change the defaults to be whatever
       * was used to save this image.  Dump the old parasites
       * and add new ones. */

      gimp_image_parasite_detach (orig_image_ID, "gimp-comment");
      if (image_comment && strlen (image_comment))
        {
          parasite = gimp_parasite_new ("gimp-comment",
                                        GIMP_PARASITE_PERSISTENT,
                                        strlen (image_comment) + 1,
                                        image_comment);
          gimp_image_parasite_attach (orig_image_ID, parasite);
          gimp_parasite_free (parasite);
        }
      gimp_image_parasite_detach (orig_image_ID, "jpeg-save-options");

      parasite = gimp_parasite_new ("jpeg-save-options",
                                    0, sizeof (jsvals), &jsvals);
      gimp_image_parasite_attach (orig_image_ID, parasite);
      gimp_parasite_free (parasite);
    }
  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;
}

/*
 * Here's the routine that will replace the standard error_exit method:
 */

void
my_error_exit (j_common_ptr cinfo)
{
  /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
  my_error_ptr myerr = (my_error_ptr) cinfo->err;

  /* Always display the message. */
  /* We could postpone this until after returning, if we chose. */
  (*cinfo->err->output_message) (cinfo);

  /* Return control to the setjmp point */
  longjmp (myerr->setjmp_buffer, 1);
}


void
my_output_message (j_common_ptr cinfo)
{
  gchar  buffer[JMSG_LENGTH_MAX + 1];

  (*cinfo->err->format_message)(cinfo, buffer);
  g_message (buffer);
}