PIKApp/pdb/groups/image_transform.pdb

# PIKA - Photo and Image Kooker Application
# 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_resize {
    $blurb = 'Resize the image to the specified extents.';

    $help = <<'HELP';
This procedure resizes the image so that it's new width and height are
equal to the supplied parameters. Offsets are also provided which
describe the position of the previous image's content. All channels
within the image are resized according to the specified parameters;
this includes the image selection mask. All layers within the image
are repositioned according to the specified offsets.
HELP

    &std_pdb_misc;

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'new_width', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image width' },
        { name => 'new_height', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image height' },
        { name => 'offx', type => 'int32',
          desc => 'x offset between upper left corner of old and
                   new images: (new - old)' },
        { name => 'offy', type => 'int32',
          desc => 'y offset between upper left corner of old and
                   new images: (new - old)' }
    );

    %invoke = (
        headers => [ qw("core/pikaimage-resize.h") ],
        code => <<'CODE'
{
  pika_image_resize (image, context,
                     new_width, new_height, offx, offy, NULL);
}
CODE
    );
}

sub image_resize_to_layers {
    $blurb = 'Resize the image to fit all layers.';

    $help = <<'HELP';
This procedure resizes the image to the bounding box of all layers of
the image. All channels within the image are resized to the new size;
this includes the image selection mask. All layers within the image
are repositioned to the new image area.
HELP

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

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

    %invoke = (
        headers => [ qw("core/pikaimage-resize.h") ],
        code => <<'CODE'
{
  pika_image_resize_to_layers (image, context, NULL, NULL, NULL, NULL, NULL);
}
CODE
    );
}

sub image_scale {
    $blurb = 'Scale the image using the default interpolation method.';

    $help = <<'HELP';

This procedure scales the image so that its new width and height are
equal to the supplied parameters. All layers and channels within the
image are scaled according to the specified parameters; this includes
the image selection mask. The interpolation method used can be set
with pika_context_set_interpolation().
HELP

    &std_pdb_misc;

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'new_width', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image width' },
        { name => 'new_height', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image height' }
    );

    %invoke = (
        headers => [ qw("core/pikaimage-scale.h") ],
        code => <<'CODE'
{
  PikaPDBContext *pdb_context = PIKA_PDB_CONTEXT (context);

  if (progress)
    pika_progress_start (progress, FALSE, _("Scaling"));

  pika_image_scale (image, new_width, new_height,
                    pdb_context->interpolation,
                    progress);

  if (progress)
    pika_progress_end (progress);
}
CODE
    );
}

sub image_crop {
    $blurb = 'Crop the image to the specified extents.';

    $help = <<'HELP';
This procedure crops the image so that it's new width and height are
equal to the supplied parameters. Offsets are also provided which
describe the position of the previous image's content. All channels
and layers within the image are cropped to the new image extents; this
includes the image selection mask. If any parameters are out of range,
an error is returned.
HELP

    &std_pdb_misc;

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'new_width', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image width: (0 < new_width <= width)' },
        { name => 'new_height', type => '1 <= int32 <= PIKA_MAX_IMAGE_SIZE',
          desc => 'New image height: (0 < new_height <= height)' },
        { name => 'offx', type => '0 <= int32',
          desc => 'X offset: (0 <= offx <= (width - new_width))' },
        { name => 'offy', type => '0 <= int32',
          desc => 'Y offset: (0 <= offy <= (height - new_height))' }
    );

    %invoke = (
        headers => [ qw("core/pikaimage-crop.h") ],
        code => <<'CODE'
{
  if (new_width  >  pika_image_get_width  (image)              ||
      new_height >  pika_image_get_height (image)              ||
      offx       > (pika_image_get_width  (image) - new_width) ||
      offy       > (pika_image_get_height (image) - new_height))
    success = FALSE;
  else
    pika_image_crop (image, context, PIKA_FILL_TRANSPARENT,
                     offx, offy, new_width, new_height,
                     TRUE);
}
CODE
    );
}

sub image_flip {
    $blurb = 'Flips the image horizontally or vertically.';

    $help = <<'HELP';
This procedure flips (mirrors) the image.
HELP

    &std_pdb_misc;

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'flip_type',
          type => 'enum PikaOrientationType (no PIKA_ORIENTATION_UNKNOWN)',
          desc => 'Type of flip' }
    );

    %invoke = (
        headers => [ qw("core/pikaimage-flip.h") ],
        code => <<'CODE'
{
  pika_image_flip (image, context, flip_type, NULL);
}
CODE
    );
}

sub image_rotate {
    $blurb = 'Rotates the image by the specified degrees.';
    $help = 'This procedure rotates the image.';

    &mitch_pdb_misc('2003');

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'rotate_type', type => 'enum PikaRotationType',
          desc => 'Angle of rotation' }
    );

    %invoke = (
        headers => [ qw("core/pikaimage-rotate.h") ],
        code => <<'CODE'
{
  if (progress)
    pika_progress_start (progress, FALSE, _("Rotating"));

  pika_image_rotate (image, context, rotate_type, progress);

  if (progress)
    pika_progress_end (progress);
}
CODE
    );
}

@headers = qw("core/pikaprogress.h"
              "pikapdbcontext.h"
              "pika-intl.h");

@procs = qw(image_resize image_resize_to_layers
            image_scale
            image_crop image_flip image_rotate);

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

$desc = 'Image Transform';
$doc_title = 'pikaimagetransform';
$doc_short_desc = 'Transformations on images.';
$doc_long_desc = 'Operations to scale, resize, crop, flip and rotate images.';

1;