gimp/pdb/groups/drawable.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 drawable_get_pixel {
    $blurb = 'Gets the value of the pixel at the specified coordinates.';

    $help = <<'HELP';
This procedure gets the pixel value at the specified coordinates.
HELP

    &std_pdb_misc;
    $date = '1997';

    @inargs = (
       { name => 'drawable', type => 'drawable',
         desc => 'The drawable' },
       { name => 'x_coord', type => '0 <= int32',
         desc => 'The x coordinate' },
       { name => 'y_coord', type => '0 <= int32',
         desc => 'The y coordinate' }
    );

    @outargs = (
       { name => 'color', type => 'geglcolor',
         desc => 'The pixel color' }
    );

    %invoke = (
       code => <<'CODE'
{
  const Babl *format = gimp_drawable_get_format (drawable);

  if (x_coord < gimp_item_get_width  (GIMP_ITEM (drawable)) &&
      y_coord < gimp_item_get_height (GIMP_ITEM (drawable)))
    {
      gint     n_bytes = babl_format_get_bytes_per_pixel (format);
      gpointer pixel;

      pixel = g_malloc0 (n_bytes);

      gegl_buffer_sample (gimp_drawable_get_buffer (drawable),
                          x_coord, y_coord, NULL, pixel, format,
                          GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
      color = gegl_color_new ("black");
      gegl_color_set_pixel (color, format, pixel);

      g_free (pixel);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_set_pixel {
    $blurb = 'Sets the value of the pixel at the specified coordinates.';

    $help = <<'HELP';
This procedure sets the pixel value at the specified coordinates.
Note that this function is not undoable, you should use it only on drawables you
just created yourself.
HELP

    &std_pdb_misc;
    $date = '1997';

    @inargs = (
       { name => 'drawable', type => 'drawable',
         desc => 'The drawable' },
       { name => 'x_coord', type => '0 <= int32',
         desc => 'The x coordinate' },
       { name => 'y_coord', type => '0 <= int32',
         desc => 'The y coordinate' },
       { name => 'color', type => 'geglcolor',
         desc => 'The pixel color' }
    );

    %invoke = (
       code => <<'CODE'
{
  if (gimp_pdb_item_is_modifiable (GIMP_ITEM (drawable),
                                   GIMP_PDB_ITEM_CONTENT, error) &&
      gimp_pdb_item_is_not_group (GIMP_ITEM (drawable), error) &&
      x_coord < gimp_item_get_width  (GIMP_ITEM (drawable)) &&
      y_coord < gimp_item_get_height (GIMP_ITEM (drawable)))
    {
      gegl_buffer_set_color (gimp_drawable_get_buffer (drawable),
                             GEGL_RECTANGLE (x_coord, y_coord, 1, 1),
                             color);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_merge_filters {
    $blurb = 'Merge the layer effect filters to the specified drawable.';

    $help = <<'HELP';
This procedure combines the contents of the drawable's filter stack
(for export) with the specified drawable.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    %invoke = (
	headers => [ qw("core/gimpdrawable-filters.h") ],
	code    => <<'CODE'
{
  if (gimp_pdb_item_is_not_group (GIMP_ITEM (drawable), error))
    gimp_drawable_merge_filters (drawable);
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_merge_shadow {
    $blurb = 'Merge the shadow buffer with the specified drawable.';

    $help = <<'HELP';
This procedure combines the contents of the drawable's shadow buffer
(for temporary processing) with the specified drawable. The 'undo'
parameter specifies whether to add an undo step for the operation.
Requesting no undo is useful for such applications as 'auto-apply'.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
        { name => 'undo', type => 'boolean',
	  desc => 'Push merge to undo stack?' }
    );

    %invoke = (
	headers => [ qw("core/gimpdrawable-shadow.h"
                        "plug-in/gimpplugin.h"
                        "plug-in/gimppluginmanager.h") ],
	code    => <<'CODE'
{
  if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL,
                                 GIMP_PDB_ITEM_CONTENT, error) &&
      gimp_pdb_item_is_not_group (GIMP_ITEM (drawable), error))
    {
      const gchar *undo_desc = _("Plug-in");

      if (gimp->plug_in_manager->current_plug_in)
        undo_desc = gimp_plug_in_get_undo_desc (gimp->plug_in_manager->current_plug_in);

      gimp_drawable_merge_shadow_buffer (drawable, undo, undo_desc);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_free_shadow {
    $blurb = "Free the specified drawable's shadow data (if it exists).";

    $help = <<'HELP';
This procedure is intended as a memory saving device. If any shadow
memory has been allocated, it will be freed automatically when the
drawable is removed from the image, or when the plug-in procedure
which allocated it returns.
HELP

    &mitch_pdb_misc('2008', '2.6');

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    %invoke = (
	headers => [ qw("plug-in/gimpplugin-cleanup.h") ],
	code => <<'CODE'
{
  if (gimp->plug_in_manager->current_plug_in)
    gimp_plug_in_cleanup_remove_shadow (gimp->plug_in_manager->current_plug_in,
                                        drawable);

  gimp_drawable_free_shadow_buffer (drawable);
}
CODE
    );
}

sub drawable_fill {
    $blurb = 'Fill the drawable with the specified fill mode.';

    $help = <<'HELP';
This procedure fills the drawable. If the fill mode is foreground the
current foreground color is used. If the fill mode is background, the
current background color is used. If the fill type is white, then
white is used. Transparent fill only affects layers with an alpha
channel, in which case the alpha channel is set to transparent. If the
drawable has no alpha channel, it is filled to white. No fill leaves
the drawable's contents undefined.

This procedure is unlike gimp_drawable_edit_fill() or the bucket fill
tool because it fills regardless of a selection. Its main purpose is to
fill a newly created drawable before adding it to the image. This
operation cannot be undone.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
	{ name => 'fill_type', type => 'enum GimpFillType',
	  desc => 'The type of fill' }
    );

    %invoke = (
	headers => [ qw("core/gimpdrawable-fill.h") ],
	code => <<'CODE'
{
  if (gimp_pdb_item_is_modifiable (GIMP_ITEM (drawable),
                                   GIMP_PDB_ITEM_CONTENT, error) &&
      gimp_pdb_item_is_not_group (GIMP_ITEM (drawable), error))
    {
      gimp_drawable_fill (drawable, context, (GimpFillType) fill_type);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_update {
    $blurb = 'Update the specified region of the drawable.';

    $help = <<'HELP';
This procedure updates the specified region of the drawable. The (x, y)
coordinate pair is relative to the drawable's origin, not to the image origin.
Therefore, the entire drawable can be updated using (0, 0, width, height).
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
	{ name => 'x', type => 'int32',
	  desc => 'x coordinate of upper left corner of update region' },
	{ name => 'y', type => 'int32',
	  desc => 'y coordinate of upper left corner of update region' },
	{ name => 'width', type => 'int32',
	  desc => 'Width of update region' },
	{ name => 'height', type => 'int32',
	  desc => 'Height of update region' }
    );

    %invoke = (
	code => <<'CODE'
{
  gimp_drawable_update (drawable, x, y, width, height);
}
CODE
    );
}

sub drawable_mask_bounds {
    $blurb = <<'BLURB';
Find the bounding box of the current selection in relation to the specified
drawable.
BLURB

    $help = <<'HELP';
This procedure returns whether there is a selection. If there is one, the
upper left and lower right-hand corners of its bounding box are returned. These
coordinates are specified relative to the drawable's origin, and bounded by
the drawable's extents. Please note that the pixel specified by the lower
right-hand coordinate of the bounding box is not part of the selection. The
selection ends at the upper left corner of this pixel. This means the width
of the selection can be calculated as (x2 - x1), its height as (y2 - y1).

Note that the returned boolean does NOT correspond with the returned
region being empty or not, it always returns whether the selection
is non_empty. See gimp_drawable_mask_intersect() for a boolean
return value which is more useful in most cases.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'non_empty', type => 'boolean',
	  desc => 'TRUE if there is a selection' },
	{ name => 'x1', type => 'int32',
	  desc => "x coordinate of the upper left corner of selection bounds" },
	{ name => 'y1', type => 'int32',
	  desc => "y coordinate of the upper left corner of selection bounds" },
	{ name => 'x2', type => 'int32',
	  desc => "x coordinate of the lower right corner of selection bounds" },
	{ name => 'y2', type => 'int32',
	  desc => "y coordinate of the lower right corner of selection bounds" }
    );

    %invoke = (
	code => <<'CODE'
{
  if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL, 0, error))
    non_empty = gimp_item_mask_bounds (GIMP_ITEM (drawable), &x1, &y1, &x2, &y2);
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_mask_intersect {
    $blurb = <<'BLURB';
Find the bounding box of the current selection in relation to the specified
drawable.
BLURB

    $help = <<'HELP';
This procedure returns whether there is an intersection between the
drawable and the selection. Unlike gimp_drawable_mask_bounds(), the
intersection's bounds are returned as x, y, width, height.

If there is no selection this function returns TRUE and the returned
bounds are the extents of the whole drawable.
HELP

    &mitch_pdb_misc('2004', '2.2');

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'non_empty', type => 'boolean',
	  desc => 'TRUE if the returned area is not empty' },
	{ name => 'x', type => 'int32',
          desc => 'x coordinate of the upper left corner of the intersection' },
	{ name => 'y', type => 'int32',
          desc => 'y coordinate of the upper left corner of the intersection' },
	{ name => 'width', type => 'int32',
          desc => 'width of the intersection' },
	{ name => 'height', type => 'int32',
          desc => 'height of the intersection' }
    );

    %invoke = (
	code => <<'CODE'
{
  if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL, 0, error))
    non_empty = gimp_item_mask_intersect (GIMP_ITEM (drawable),
                                          &x, &y, &width, &height);
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_get_format {
    $blurb = "Returns the drawable's Babl format";

    $help = <<'HELP';
This procedure returns the drawable's Babl format.

Note that the actual PDB procedure only transfers the format's
encoding. In order to get to the real format, the libbgimp C wrapper
must be used.
HELP

    &mitch_pdb_misc('2012', '2.10');

    $lib_private = 1;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'format', type => 'string',
	  desc => "The drawable's Babl format" }
    );

    %invoke = (
	code => <<'CODE'
{
  /* this only transfers the encoding, losing the space, see the
   * code in libgimp/gimpdrawable.c which reconstructs the actual
   * format in the plug-in process
   */
  format = g_strdup (babl_format_get_encoding (gimp_drawable_get_format (drawable)));
}
CODE
    );
}

sub drawable_get_thumbnail_format {
    $blurb = "Returns the drawable's thumbnail Babl format";

    $help = <<'HELP';
This procedure returns the drawable's thumbnail Babl format.

Thumbnails are always 8-bit images, see gimp_drawable_thumbnail() and
gimp_drawable_sub_thmbnail().
HELP

    &mitch_pdb_misc('2019', '2.10.14');

    $lib_private = 1;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'format', type => 'string',
	  desc => "The drawable's thumbnail Babl format" }
    );

    %invoke = (
	code => <<'CODE'
{
  format = g_strdup (babl_format_get_encoding (gimp_drawable_get_preview_format (drawable)));

}
CODE
    );
}

sub drawable_type {
    $blurb = "Returns the drawable's type.";
    $help  = "This procedure returns the drawable's type.";

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'type', type => 'enum GimpImageType',
	  desc => "The drawable's type" }
    );

    %invoke = (
	code => <<'CODE'
{
  type = gimp_babl_format_get_image_type (gimp_drawable_get_format (drawable));
}
CODE
    );
}

sub drawable_has_alpha {
    $blurb = 'Returns TRUE if the drawable has an alpha channel.';

    $help = <<'HELP';
This procedure returns whether the specified drawable has an alpha channel.
This can only be true for layers, and the associated type will be one of:
{ RGBA , GRAYA, INDEXEDA }.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'has_alpha', type => 'boolean',
	  desc => 'Does the drawable have an alpha channel?' }
    );

    %invoke = (
	code => <<'CODE'
{
  has_alpha = gimp_drawable_has_alpha (drawable);
}
CODE
    );
}

sub drawable_type_with_alpha {
    $blurb = "Returns the drawable's type with alpha.";

    $help = <<'HELP';
This procedure returns the drawable's type as if had an alpha
channel. If the type is currently Gray, for instance, the returned
type would be GrayA. If the drawable already has an alpha channel, the
drawable's type is simply returned.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'type_with_alpha', type => 'enum GimpImageType
					      (no GIMP_RGB_IMAGE,
					       GIMP_GRAY_IMAGE,
					       GIMP_INDEXED_IMAGE)',
	  desc => "The drawable's type with alpha" }
    );

    %invoke = (
	code => <<'CODE'
{
  const Babl *format = gimp_drawable_get_format_with_alpha (drawable);

  type_with_alpha = gimp_babl_format_get_image_type (format);
}
CODE
    );
}

sub drawable_is_rgb {
    $blurb = 'Returns whether the drawable is an RGB type.';

    $help = <<HELP;
This procedure returns TRUE if the specified drawable
is of type { RGB, RGBA }.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'is_rgb', type => 'boolean',
	  desc => 'TRUE if the drawable is an RGB type' }
    );

    %invoke = (
	code => <<'CODE'
{
  is_rgb = gimp_drawable_is_rgb (drawable);
}
CODE
    );
}

sub drawable_is_gray {
    $blurb = 'Returns whether the drawable is a grayscale type.';

    $help = <<HELP;
This procedure returns TRUE if the specified drawable
is of type { Gray, GrayA }.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'is_gray', type => 'boolean',
	  desc => 'TRUE if the drawable is a grayscale type' }
    );

    %invoke = (
	code => <<'CODE'
{
  is_gray = gimp_drawable_is_gray (drawable);
}
CODE
    );
}

sub drawable_is_indexed {
    $blurb = 'Returns whether the drawable is an indexed type.';

    $help = <<HELP;
This procedure returns TRUE if the specified drawable
is of type { Indexed, IndexedA }.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'is_indexed', type => 'boolean',
	  desc => 'TRUE if the drawable is an indexed type' }
    );

    %invoke = (
	code => <<'CODE'
{
  is_indexed = gimp_drawable_is_indexed (drawable);
}
CODE
    );
}

sub drawable_get_bpp {
    $blurb = 'Returns the bytes per pixel.';

    $help = <<'HELP';
This procedure returns the number of bytes per pixel.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'bpp', type => 'int32',
	  desc => 'Bytes per pixel' }
    );

    %invoke = (
	code => <<'CODE'
{
  const Babl *format = gimp_drawable_get_format (drawable);

  bpp = babl_format_get_bytes_per_pixel (format);
}
CODE
    );
}

sub drawable_get_width {
    $blurb = 'Returns the width of the drawable.';
    $help  = "This procedure returns the specified drawable's width in pixels.";

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'width', type => 'int32',
	  desc => 'Width of drawable' }
    );

    %invoke = (
	code => <<'CODE'
{
  width = gimp_item_get_width (GIMP_ITEM (drawable));
}
CODE
    );
}

sub drawable_get_height {
    $blurb = 'Returns the height of the drawable.';
    $help  = "This procedure returns the specified drawable's height in pixels.";

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'height', type => 'int32',
	  desc => 'Height of drawable' }
    );

    %invoke = (
	code => <<'CODE'
{
  height = gimp_item_get_height (GIMP_ITEM (drawable));
}
CODE
    );
}

sub drawable_get_offsets {
    $blurb = 'Returns the offsets for the drawable.';

    $help = <<'HELP';
This procedure returns the specified drawable's offsets. This only makes sense
if the drawable is a layer since channels are anchored. The offsets of a
channel will be returned as 0.
HELP

    &std_pdb_misc;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' }
    );

    @outargs = (
	{ name => 'offset_x', type => 'int32', void_ret => 1,
	  desc => "x offset of drawable" },
	{ name => 'offset_y', type => 'int32',
	  desc => "y offset of drawable" }
    );

    %invoke = (
	code => <<'CODE'
{
  gimp_item_get_offset (GIMP_ITEM (drawable), &offset_x, &offset_y);
}
CODE
    );
}

sub drawable_thumbnail {
    $blurb = 'Get a thumbnail of a drawable.';

    $help = <<'HELP';
This function gets data from which a thumbnail of a drawable preview
can be created. Maximum x or y dimension is 1024 pixels. The pixels are
returned in RGB[A] or GRAY[A] format. The bpp return value gives the
number of bytes in the image.
HELP

    &andy_pdb_misc('1999');

    $lib_private = 1;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
	{ name => 'width', type => '1 <= int32 <= 1024',
	  desc => 'The requested thumbnail width' },
	{ name => 'height', type => '1 <= int32 <= 1024',
	  desc => 'The requested thumbnail height' }
    );

    @outargs = (
	{ name => 'actual_width', type => 'int32', void_ret => 1,
	  desc => 'The previews width' },
	{ name => 'actual_height', type => 'int32',
	  desc => 'The previews height' },
	{ name => 'bpp', type => 'int32',
	  desc => 'The previews bpp' },
  { name => 'thumbnail_data', type => 'bytes',
    desc => 'The thumbnail data', }
    );

    %invoke = (
	code => <<'CODE'
{
  GimpImage   *image = gimp_item_get_image (GIMP_ITEM (drawable));
  GimpTempBuf *buf;
  gint         dwidth, dheight;

  gimp_assert (GIMP_VIEWABLE_MAX_PREVIEW_SIZE >= 1024);

  /* Adjust the width/height ratio */
  dwidth  = gimp_item_get_width  (GIMP_ITEM (drawable));
  dheight = gimp_item_get_height (GIMP_ITEM (drawable));

  if (dwidth > dheight)
    height = MAX (1, (width * dheight) / dwidth);
  else
    width  = MAX (1, (height * dwidth) / dheight);

  if (image->gimp->config->layer_previews)
    buf = gimp_viewable_get_new_preview (GIMP_VIEWABLE (drawable), context,
                                         width, height);
  else
    buf = gimp_viewable_get_dummy_preview (GIMP_VIEWABLE (drawable),
                                           width, height,
                                           gimp_drawable_get_preview_format (drawable));

  if (buf)
    {
      actual_width         = gimp_temp_buf_get_width  (buf);
      actual_height        = gimp_temp_buf_get_height (buf);
      bpp                  = babl_format_get_bytes_per_pixel (gimp_temp_buf_get_format (buf));
      thumbnail_data       = g_bytes_new (gimp_temp_buf_get_data (buf),
                                          gimp_temp_buf_get_data_size (buf));

      gimp_temp_buf_unref (buf);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_sub_thumbnail {
    $blurb = 'Get a thumbnail of a sub-area of a drawable drawable.';

    $help = <<'HELP';
This function gets data from which a thumbnail of a drawable preview
can be created. Maximum x or y dimension is 1024 pixels. The pixels are
returned in RGB[A] or GRAY[A] format. The bpp return value gives the
number of bytes in the image.
HELP

    &mitch_pdb_misc('2004', '2.2');

    $lib_private = 1;

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
        { name => 'src_x', type => '0 <= int32',
          desc => 'The x coordinate of the area' },
        { name => 'src_y', type => '0 <= int32',
          desc => 'The y coordinate of the area' },
        { name => 'src_width', type => '1 <= int32',
          desc => 'The width of the area' },
        { name => 'src_height', type => '1 <= int32',
          desc => 'The height of the area' },
	{ name => 'dest_width', type => '1 <= int32 <= 1024',
	  desc => 'The thumbnail width' },
	{ name => 'dest_height', type => '1 <= int32 <= 1024',
	  desc => 'The thumbnail height' }
    );

    @outargs = (
	{ name => 'width', type => 'int32', void_ret => 1,
	  desc => 'The previews width' },
	{ name => 'height', type => 'int32',
	  desc => 'The previews height' },
	{ name => 'bpp', type => 'int32',
	  desc => 'The previews bpp' },
  { name => 'thumbnail_data', type => 'bytes',
	  desc => 'The thumbnail data' }
    );

    %invoke = (
	headers => [ qw("core/gimpdrawable-preview.h") ],
        code    => <<'CODE'
{
  if ((src_x + src_width)  <= gimp_item_get_width  (GIMP_ITEM (drawable)) &&
      (src_y + src_height) <= gimp_item_get_height (GIMP_ITEM (drawable)))
    {
      GimpImage   *image = gimp_item_get_image (GIMP_ITEM (drawable));
      GimpTempBuf *buf;

      if (image->gimp->config->layer_previews)
        buf = gimp_drawable_get_sub_preview (drawable,
                                             src_x, src_y,
                                             src_width, src_height,
                                             dest_width, dest_height);
      else
        buf = gimp_viewable_get_dummy_preview (GIMP_VIEWABLE (drawable),
                                               dest_width, dest_height,
                                               gimp_drawable_get_preview_format (drawable));

      if (buf)
        {
          width                = gimp_temp_buf_get_width  (buf);
          height               = gimp_temp_buf_get_height (buf);
          bpp                  = babl_format_get_bytes_per_pixel (gimp_temp_buf_get_format (buf));
          thumbnail_data       = g_bytes_new (gimp_temp_buf_get_data (buf),
                                              gimp_temp_buf_get_data_size (buf));

          gimp_temp_buf_unref (buf);
        }
      else
        success = FALSE;
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_offset {
    $blurb = <<'BLURB';
Offset the drawable by the specified amounts in the X and Y directions
BLURB

    $help = <<'HELP';
This procedure offsets the specified drawable by the amounts specified by
'offset_x' and 'offset_y'. If 'wrap_around' is set to TRUE, then portions of
the drawable which are offset out of bounds are wrapped around. Alternatively,
the undefined regions of the drawable can be filled with transparency or the
background color, as specified by the 'fill-type' parameter.
HELP

    &std_pdb_misc;
    $date = '1997';

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable to offset' },
	{ name => 'wrap_around', type => 'boolean',
	  desc => 'wrap image around or fill vacated regions' },
	{ name => 'fill_type', type => 'enum GimpOffsetType',
	  desc => 'fill vacated regions of drawable with background or
		   transparent' },
	{ name => 'offset_x', type => 'int32',
	  desc => 'offset by this amount in X direction' },
	{ name => 'offset_y', type => 'int32',
	  desc => 'offset by this amount in Y direction' }
    );

    %invoke = (
	code => <<'CODE'
{
  if (gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL,
                                 GIMP_PDB_ITEM_CONTENT, error) &&
      gimp_pdb_item_is_not_group (GIMP_ITEM (drawable), error))
    gimp_drawable_offset (drawable, context, wrap_around, fill_type,
                          offset_x, offset_y);
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_foreground_extract {
    $blurb = 'Extract the foreground of a drawable using a given trimap.';

    $help = <<'HELP';
Image Segmentation by Uniform Color Clustering, see
https://www.inf.fu-berlin.de/inst/pubs/tr-b-05-07.pdf
HELP

    $author    = 'Gerald Friedland <fland@inf.fu-berlin.de>, Kristian Jantz <jantz@inf.fu-berlin.de>, Sven Neumann <sven@gimp.org>';
    $copyright = 'Gerald Friedland';
    $date      = '2005';
    $since     = '2.4';

    @inargs = (
	{ name => 'drawable', type => 'drawable',
	  desc => 'The drawable' },
        { name => 'mode', type => 'enum GimpForegroundExtractMode',
	  desc => 'The algorithm to use' },
        { name => 'mask', type => 'drawable', desc => 'Tri-Map' }
    );

    %invoke = (
	headers => [ qw("core/gimpdrawable-foreground-extract.h") ],
        code    => <<'CODE'
{
  if (mode == GIMP_FOREGROUND_EXTRACT_MATTING &&
      gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL, 0, error))
    {
      GimpPDBContext *pdb_context = GIMP_PDB_CONTEXT (context);
      GimpImage      *image       = gimp_item_get_image (GIMP_ITEM (drawable));
      GeglBuffer     *buffer;

      buffer = gimp_drawable_foreground_extract (drawable,
                                                 GIMP_MATTING_ENGINE_GLOBAL,
                                                 2,
                                                 2,
                                                 2,
                                                 gimp_drawable_get_buffer (mask),
                                                 progress);

      gimp_channel_select_buffer (gimp_image_get_mask (image),
                                  C_("command", "Foreground Select"),
                                  buffer,
                                  0, /* x offset */
                                  0, /* y offset */
                                  GIMP_CHANNEL_OP_REPLACE,
                                  pdb_context->feather,
                                  pdb_context->feather_radius_x,
                                  pdb_context->feather_radius_y);

      g_object_unref (buffer);
    }
  else
    success = FALSE;
}
CODE
    );
}


@headers = qw("config/gimpcoreconfig.h"
              "gegl/gimp-babl.h"
              "gegl/gimp-babl-compat.h"
              "core/gimp.h"
              "core/gimpchannel-select.h"
              "core/gimpdrawable-filters.h"
              "core/gimpdrawable-offset.h"
              "core/gimpimage.h"
              "core/gimptempbuf.h"
              "gimppdb-utils.h"
              "gimppdbcontext.h"
              "gimp-intl.h");

@procs = qw(drawable_get_format
            drawable_get_thumbnail_format
            drawable_get_pixel
            drawable_set_pixel
            drawable_type
            drawable_type_with_alpha
            drawable_has_alpha
            drawable_is_rgb
            drawable_is_gray
            drawable_is_indexed
            drawable_get_bpp
            drawable_get_width
            drawable_get_height
            drawable_get_offsets
            drawable_mask_bounds
            drawable_mask_intersect
            drawable_merge_filters
            drawable_merge_shadow
            drawable_free_shadow
            drawable_update
            drawable_fill
            drawable_offset
            drawable_thumbnail
            drawable_sub_thumbnail
            drawable_foreground_extract);

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

$desc = 'Drawable procedures';
$doc_title = 'gimpdrawable';
$doc_short_desc = 'Functions to manipulate drawables.';
$doc_long_desc = 'Functions to manipulate drawables.';

1;