# 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.

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

sub drawable_arg () {{
    name => 'drawable',
    type => 'drawable',
    desc => 'The drawable',
}}

sub drawable_coord_args () {
    @inargs = ( &drawable_arg );

    foreach (qw(x y)) {
	push @inargs, { name => "${_}_coord", type => '0 <= int32',
			desc => "The $_ coordinate", alias => $_ }
    }
}

sub pixel_arg () {{
    name => 'pixel',
    type => 'int8array',
    desc => 'The pixel value',
    array => { name => 'num_channels', type => 'int32',
	       desc => 'The number of channels for the pixel',
	       no_success => 1 }
}}

sub drawable_prop_proc {
    my ($return, $name, $type, $func, $desc, $core_type, $core_var) = @_;

    $core_type = 'drawable' unless $core_type;
    $core_var  = 'drawable' unless $core_var;

    $blurb = "Returns $return.";

    &std_pdb_misc;

    @inargs = ( &drawable_arg );

    @outargs = (
	{ name => $name, type => $type, desc => $desc, 
	  alias => "gimp_${core_type}_$func (${core_var})", no_declare => 1 }
    );
}

sub drawable_type_proc {
    my ($desc, $type, $func) = @_;

    $help = <<HELP;
This procedure returns non-zero if the specified drawable is of type
{ $type }.
HELP

    &drawable_prop_proc("whether the drawable is $desc type", $func, 'boolean',
			$func, "non-zero if the drawable is $desc type");
}

sub drawable_is_proc {
    my ($desc, $check) = @_;

    my $type = $desc;
    $type =~ s/ /_/g;

    $help = <<HELP;
This procedure returns non-zero if the specified drawable is a $desc.
HELP

    &drawable_prop_proc("whether the drawable is a $desc",
			$type, 'boolean', $type,
			"Non-zero if the drawable is a $desc");

    $outargs[0]->{alias} = $check . ' (drawable) ? TRUE : FALSE';
}

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

    $help = <<'HELP';
This procedure combines the contents of the image'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 = (
	&drawable_arg,
        { name => 'undo', type => 'boolean',
	  desc => 'Push merge to undo stack?' }
    );

    %invoke = ( headers => [ qw("core/gimp.h" "plug-in/plug-in.h") ],
                vars => [ 'gchar *undo_desc = NULL' ],
                code => <<CODE
{
  if (gimp->current_plug_in)
    undo_desc = plug_in_get_undo_desc (gimp->current_plug_in);

  if (! undo_desc)
    undo_desc = g_strdup (_("Plug-In"));

  gimp_drawable_merge_shadow (drawable, undo, undo_desc);

  g_free (undo_desc);
}
CODE
    );
}

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

    $help = <<'HELP';
This procedure fills the drawable with the fill mode. 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 the bucket fill tool because it fills
regardless of a selection
HELP

    &std_pdb_misc;

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

    %invoke = ( code => 'gimp_drawable_fill_by_type (drawable, gimp_get_current_context (gimp), (GimpFillType) fill_type);' );
}

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 with: {x->0, y->0, w->width,
h->height }.
HELP

    &std_pdb_misc;

    @inargs = (
	&drawable_arg,
	{ 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 => 'gimp_drawable_update (drawable, x, y, width, height);' );
}

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 the whether there is a selection. If there is one, the
upper left and lower righthand 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
righthand 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).
HELP

    &std_pdb_misc;

    @inargs = ( &drawable_arg );

    @outargs = (
	{ name => 'non_empty', type => 'boolean', init => 1,
	  desc => 'TRUE if there is a selection' },
    );

    my $pos = 1;
    foreach $where ('upper left', 'lower right') {
	foreach (qw(x y)) {
	    push @outargs, { name => "$_$pos", type => 'int32',
	    		     desc => "$_ coordinate of the $where corner of
			     	      selection bounds" }
	}
	$pos++;
    }

    %invoke = (
	code => <<'CODE'
non_empty = gimp_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
CODE
    );
}

sub drawable_image {
    $blurb = "Returns the drawable's image.";

    $help = "This procedure returns the drawable's image.";

    &std_pdb_misc;

    @inargs = ( &drawable_arg );

    @outargs = ( &std_image_arg );
    $outargs[0]->{desc} = "The drawable's image";
    $outargs[0]->{init} = 1;

    %invoke = (
	code => 'success = (gimage = gimp_item_get_image (GIMP_ITEM (drawable))) != NULL;'
    );
}

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

    &drawable_prop_proc("the drawable's type", 'type', 'enum GimpImageType',
			'type', "The drawable's type: { %%desc%% }");
}

sub drawable_has_alpha {
    $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

    &drawable_prop_proc('non-zero if the drawable has an alpha channel',
			'has_alpha', 'boolean', 'has_alpha',
			'Does the drawable have an alpha channel?');
}

sub drawable_type_with_alpha {
    $help = <<'HELP';
This procedure returns the drawable's type if an alpha channel were added. 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

    &drawable_prop_proc("the drawable's type with alpha", 'type_with_alpha',
			'enum GimpImageType (no RGB_GIMAGE, GRAY_GIMAGE,
			 INDEXED_GIMAGE)', 'type_with_alpha',
			"The drawable's type with alpha: { %%desc%% }");
}

sub drawable_is_rgb {
    &drawable_type_proc('an RGB', 'RGB, RGBA', 'is_rgb');
}

sub drawable_is_gray {
    &drawable_type_proc('a grayscale', 'Gray, GrayA', 'is_gray');
}

sub drawable_is_indexed {
    &drawable_type_proc('an indexed', 'Indexed, IndexedA', 'is_indexed');
}

sub drawable_bytes {
    $help = <<'HELP';
This procedure returns the number of bytes per pixel (or the number of
channels) for the specified drawable.
HELP

    &drawable_prop_proc('the bytes per pixel', 'bytes', 'int32', 'bytes',
			'Bytes per pixel');
}

sub drawable_width {
    $help = "This procedure returns the specified drawable's width in pixels.";

    &drawable_prop_proc('the width of the drawable', 'width', 'int32',
			'width', 'Width of drawable',
                        'item', 'GIMP_ITEM (drawable)');
}

sub drawable_height {
    $help = "This procedure returns the specified drawable's height in pixels.";

    &drawable_prop_proc('the height of the drawable', 'height', 'int32',
			'height', 'Height of drawable',
                        'item', 'GIMP_ITEM (drawable)');
}

sub drawable_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 = ( &drawable_arg );

    foreach (qw(x y)) {
	push @outargs, { name => "offset_$_", type => 'int32',
			 desc => "$_ offset of drawable", void_ret => 1 }
    }

    %invoke = ( code => 'gimp_item_offsets (GIMP_ITEM (drawable), &offset_x, &offset_y);' );
}

sub drawable_is_layer {
    &drawable_is_proc('layer', 'GIMP_IS_LAYER');
}

sub drawable_is_layer_mask {
    &drawable_is_proc('layer mask', 'GIMP_IS_LAYER_MASK');
}

sub drawable_is_channel {
    &drawable_is_proc('channel', 'GIMP_IS_CHANNEL');
}

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. The
'num_channels' argument must always be equal to the bytes-per-pixel value for
the specified drawable.
HELP

    &std_pdb_misc;
    $date = '1997';

    &drawable_coord_args();

    @outargs = ( &pixel_arg );
    $outargs[0]->{init} = $outargs[0]->{array}->{init} = 1;

    %invoke = (
	vars => [ 'guint8 *p', 'gint b', 'Tile *tile' ],
	code => <<'CODE'
{
  if (x < gimp_item_width  (GIMP_ITEM (drawable)) &&
      y < gimp_item_height (GIMP_ITEM (drawable)))
    {  
      num_channels = gimp_drawable_bytes (drawable);
      pixel = g_new (guint8, num_channels);

      tile = tile_manager_get_tile (gimp_drawable_data (drawable), x, y,
				    TRUE, TRUE);

      x %= TILE_WIDTH;
      y %= TILE_HEIGHT;

      p = tile_data_pointer (tile, x, y);
      for (b = 0; b < num_channels; b++)
	pixel[b] = p[b];

      tile_release (tile, FALSE);
    }
  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. The
'num_channels' argument must always be equal to the bytes-per-pixel value for
the spec ified drawable.
HELP

    &std_pdb_misc;
    $date = '1997';

    &drawable_coord_args;
    push @inargs, &pixel_arg;

    %invoke = (
	vars => [ 'guint8 *p', 'gint b', 'Tile *tile' ],
	code => <<'CODE'
{
  if (x < gimp_item_width  (GIMP_ITEM (drawable)) &&
      y < gimp_item_height (GIMP_ITEM (drawable)) &&
      num_channels == gimp_drawable_bytes (drawable))
    {
      tile = tile_manager_get_tile (gimp_drawable_data (drawable), x, y,
				    TRUE, TRUE);

      x %= TILE_WIDTH;
      y %= TILE_HEIGHT;

      p = tile_data_pointer (tile, x, y);
      for (b = 0; b < num_channels; b++)
	*p++ = *pixel++;

      tile_release (tile, TRUE);
    }
  else
    success = FALSE;
}
CODE
    );
}

sub drawable_set_image {
    $blurb = 'Set image where drawable belongs to.';

    $help = <<'HELP';
Set the image the drawable should be a part of (Use this before adding a
drawable to another image).
HELP

    &std_pdb_misc;

    @inargs = (
	&drawable_arg,
	&std_image_arg
    );

    %invoke = ( code => 'gimp_item_set_image (GIMP_ITEM (drawable), gimage);' );
}


sub dim_args () {
    my @args;
    foreach (qw(width height bpp)) {
	push @args, { name => $_, type => 'int32', desc => "The previews $_", init => 1 };
    }
    @args;
}

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 128 pixels. The pixels are returned 
in the RGB[A] format. The bpp return value gives the number of bytes in 
the image. The alpha channel is also returned if the drawable has one.
HELP

    $author = $copyright = 'Andy Thomas';
    $date = '1999';

    @inargs = (
	&drawable_arg,
	{ name => 'width', type => '0 < int32',
	  desc => 'The thumbnail width',
	  alias => 'req_width' },
	{ name => 'height', type => '0 < int32',
	  desc => 'The thumbnail height',
	  alias => 'req_height' }
    );

    @outargs = (
	&dim_args,
        { name => 'thumbnail_data', type => 'int8array',
	  desc => 'The thumbnail data', init => 1, wrap => 1,
	  array => { name => 'thumbnail_data_count',
		     desc => 'The number of bytes in thumbnail data',
		     alias => 'num_bytes', init => 1 } }
    );
    $outargs[0]->{void_ret} = 1;

    %invoke = (
	headers => [ qw(<string.h> "core/gimplayer.h") ],
	code => <<'CODE'
{
  TempBuf * buf;
  gint dwidth, dheight;

  if (req_width <= 128 && req_height <= 128)
    {	
      /* Adjust the width/height ratio */
      dwidth  = gimp_item_width  (GIMP_ITEM (drawable));
      dheight = gimp_item_height (GIMP_ITEM (drawable));

      if (dwidth > dheight)
	req_height = MAX (1, (req_width * dheight) / dwidth);
      else
	req_width  = MAX (1, (req_height * dwidth) / dheight);

      buf = gimp_viewable_get_preview (GIMP_VIEWABLE (drawable),
				       req_width, req_height);

      if (buf)
        {
          num_bytes = buf->height * buf->width * buf->bytes;
          thumbnail_data = g_memdup (temp_buf_data (buf), num_bytes);
          width = buf->width;	
          height = buf->height;
          bpp = buf->bytes;
        }
    }
}
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: %%desc%%' },
	{ 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'
{
  gimp_drawable_offset (drawable, wrap_around, fill_type, offset_x, offset_y);
}
CODE
    );
}

@headers = qw("core/gimp.h" "core/gimplayermask.h" "core/gimpchannel.h"
              "core/gimpdrawable.h" "core/gimpdrawable-offset.h"
	      "base/tile.h" "base/tile-manager.h" "base/temp-buf.h"
              "gimp-intl.h");

@procs = qw(drawable_merge_shadow drawable_fill drawable_update
	    drawable_mask_bounds drawable_image drawable_type
	    drawable_has_alpha drawable_type_with_alpha drawable_is_rgb
	    drawable_is_gray drawable_is_indexed drawable_bytes drawable_width
	    drawable_height drawable_offsets drawable_is_layer
	    drawable_is_layer_mask drawable_is_channel drawable_get_pixel
	    drawable_set_pixel drawable_set_image drawable_thumbnail
	    drawable_offset);
%exports = (app => [@procs], lib => [@procs[0..17,21..22]]);

$desc = 'Drawable procedures';

1;
