Gimp/pdb/groups/image_autocrop.pdb

# 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 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/>.

# "Perlized" from C source by Manish Singh <yosh@gimp.org>


sub image_autocrop {
    $blurb = 'Remove empty borders from the image';

    $help = <<'HELP';
Remove empty borders from the @image based on empty borders of the input @drawable.


The input drawable serves as a base for detecting cropping extents
(transparency or background color).

With a %NULL input drawable, the image itself will serve as a base for
detecting cropping extents.
HELP

    &std_pdb_misc;
    $date = '1997';

    @inargs = (
	{ name => 'image', type => 'image',
	  desc => 'Input image)' },
	{ name => 'drawable', type => 'drawable', none_ok => 1,
	  desc => 'Input drawable' }
    );

    %invoke = (
	code => <<'CODE'
{
  gint x, y, width, height;

  if (drawable != NULL)
    {
      if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL,
                                     GIMP_PDB_ITEM_CONTENT, error))
        {
          gint off_x, off_y;

          gimp_pickable_auto_shrink (GIMP_PICKABLE (drawable),
                                     0, 0,
                                     gimp_item_get_width  (GIMP_ITEM (drawable)),
                                     gimp_item_get_height (GIMP_ITEM (drawable)),
                                     &x, &y, &width, &height);

          gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
          x += off_x;
          y += off_y;
        }
      else
        {
          success = FALSE;
        }
    }
  else
    {
      gimp_pickable_auto_shrink (GIMP_PICKABLE (image),
                                 0, 0,
                                 gimp_image_get_width  (image),
                                 gimp_image_get_height (image),
                                 &x, &y, &width, &height);
    }

  if (success)
    {
      gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_ITEM_RESIZE,
                                   _("Autocrop image"));

      if (x          < 0                             ||
          y          < 0                             ||
          x + width  > gimp_image_get_width  (image) ||
          y + height > gimp_image_get_height (image))
        {
          /*
           * partially outside the image area, we need to
           * resize the image to be able to crop properly.
           */
          gimp_image_resize (image, context, width, height, -x, -y, NULL);

          x = y = 0;
        }

      gimp_image_crop (image, context, GIMP_FILL_TRANSPARENT,
                       x, y, width, height, TRUE);

      gimp_image_undo_group_end (image);
    }
}
CODE
    );
}

sub image_autocrop_selected_layers {
    $blurb = 'Crop the selected layers based on empty borders of the input drawable';

    $help = <<'HELP';
Crop the selected layers of the input @image based on empty borders of the input @drawable.

The input drawable serves as a base for detecting cropping extents
(transparency or background color), and is not necessarily among the
cropped layers (the current selected layers).

With a %NULL input drawable, the image itself will serve as a base for
detecting cropping extents.
HELP

    &std_pdb_misc;
    $date = '1997';

    @inargs = (
	{ name => 'image', type => 'image',
	  desc => 'Input image' },
	{ name => 'drawable', type => 'drawable', none_ok => 1,
	  desc => 'Input drawable' }
    );

    %invoke = (
	code => <<'CODE'
{
  GimpAutoShrink shrink;
  gint           x, y, width, height;

  if (drawable != NULL)
    {
      if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL,
                                     GIMP_PDB_ITEM_CONTENT, error))
        {
          gint off_x, off_y;

          shrink = gimp_pickable_auto_shrink (GIMP_PICKABLE (drawable),
                                              0, 0,
                                              gimp_item_get_width  (GIMP_ITEM (drawable)),
                                              gimp_item_get_height (GIMP_ITEM (drawable)),
                                              &x, &y, &width, &height);

          gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
          x += off_x;
          y += off_y;
        }
      else
        {
          success = FALSE;
        }
    }
  else
    {
      shrink = gimp_pickable_auto_shrink (GIMP_PICKABLE (image),
                                          0, 0,
                                          gimp_image_get_width  (image),
                                          gimp_image_get_height (image),
                                          &x, &y, &width, &height);
    }

  if (success && shrink != GIMP_AUTO_SHRINK_SHRINK)
    success = FALSE;

  if (success)
    {
      GList *layers = gimp_image_get_selected_layers (image);

      if (layers)
        {
          GList *iter;

          gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_ITEM_RESIZE,
                                       _("Autocrop layer"));

          for (iter = layers; iter; iter = iter->next)
            {
              gint layer_off_x, layer_off_y;

              gimp_item_get_offset (GIMP_ITEM (iter->data), &layer_off_x, &layer_off_y);
              gimp_item_resize (GIMP_ITEM (iter->data),
                                context, GIMP_FILL_TRANSPARENT,
                                width, height, layer_off_x - x, layer_off_y - y);
             }

          gimp_image_undo_group_end (image);
	}
      else
        {
          success = FALSE;
        }
    }
}
CODE
    );
}

@headers = qw("core/gimpimage-crop.h"
              "core/gimpimage-resize.h"
              "core/gimpimage-undo.h"
              "core/gimppickable.h"
              "core/gimppickable-auto-shrink.h"
              "gimppdb-utils.h"
              "gimp-intl.h");

@procs = qw(image_autocrop
            image_autocrop_selected_layers);

%exports = (app => [@procs], lib => [@procs]);

$desc = 'Image Autocrop';
$doc_title = 'gimpimageautocrop';
$doc_short_desc = 'Functions that crop images or layers.';
$doc_long_desc =  'Functions that crop images or layers.';

1;