PIKApp/pdb/groups/text_tool.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 text_font {
    $blurb = <<'BLURB';
Add text at the specified location as a floating selection or a new layer.
BLURB

    $help = <<'HELP';
The x and y parameters together control the placement of the new text by
specifying the upper left corner of the text bounding box. If the specified
drawable parameter is valid, the text will be created as a floating selection
attached to the drawable. If the drawable parameter is not valid (%NULL), the
text will appear as a new layer. Finally, a border can be specified around the
final rendered text. The border is measured in pixels.

The size is always in pixels. If you need to display a font in points, divide
the size in points by 72.0 and multiply it by the image's vertical resolution.
HELP

    &std_pdb_misc;
    $author = 'Martin Edlman & Sven Neumann';
    $date = '1998- 2001';

    @inargs = (
        { name => 'image', type => 'image',
          desc => 'The image' },
        { name => 'drawable', type => 'drawable',
          desc => 'The affected drawable: (%NULL for a new text layer)',
          none_ok => 1 },
        { name => 'x', type => 'float',
          desc => 'The x coordinate for the left of the text bounding box' },
        { name => 'y', type => 'float',
          desc => 'The y coordinate for the top of the text bounding box' },
        { name => 'text', type => 'string',
          desc => 'The text to generate (in UTF-8 encoding)' },
        { name => 'border', type => '-1 <= int32',
          desc => 'The size of the border' },
        { name => 'antialias', type => 'boolean',
          desc => 'Antialiasing' },
        { name => 'size', type => '0 < float',
          desc => 'The size of text in pixels' },
        { name => 'font', type => 'font',
          desc => 'The font' }
    );

    @outargs = (
        { name => 'text_layer', type => 'layer', none_ok => 1,
          desc => 'The new text layer or %NULL if no layer was created.' }
    );

    %invoke = (
        code => <<'CODE'
{
  if (drawable &&
      (! pika_pdb_item_is_attached (PIKA_ITEM (drawable), image,
                                    PIKA_PDB_ITEM_CONTENT, error) ||
       ! pika_pdb_item_is_not_group (PIKA_ITEM (drawable), error)))
    success = FALSE;

  if (success)
    text_layer = text_render (image, drawable, context,
                              x, y, font, size, text,
                              border, antialias);
}
CODE
    );
}

sub text_get_extents_font {
    $blurb = 'Get extents of the bounding box for the specified text.';

    $help = <<'HELP';
This tool returns the width and height of a bounding box for the specified text
rendered with the specified font information. Ascent and descent of the glyph
extents are returned as well.

The ascent is the distance from the baseline to the highest point of the
character. This is positive if the glyph ascends above the baseline.
The descent is the distance from the baseline to the lowest point of the
character. This is positive if the glyph descends below the baseline.

The size is always in pixels. If you need to set a font in points, divide the
size in points by 72.0 and multiply it by the vertical resolution of the image
you are taking into account.
HELP

    &std_pdb_misc;
    $author = 'Martin Edlman & Sven Neumann';
    $date = '1998- 2001';

    @inargs = (
        { name => 'text', type => 'string',
          desc => 'The text to generate (in UTF-8 encoding)' },
        { name => 'size', type => '0 < float',
          desc => 'The size of text in either pixels or points' },
        { name => 'font', type => 'font',
          desc => 'The name of the font' }
    );

    @outargs = (
        { name => 'width', type => 'int32', void_ret => 1,
          desc => 'The width of the glyph extents' },
        { name => 'height', type => 'int32',
          desc => 'The height of the glyph extents' },
        { name => 'ascent', type => 'int32',
          desc => 'The ascent of the glyph extents' },
        { name => 'descent', type => 'int32',
          desc => 'The descent of the glyph extents' }
    );

    %invoke = (
        code => <<'CODE'
{
  success = text_get_extents (pika,
                              font, size, text,
                              &width, &height,
                              &ascent, &descent);
}
CODE
    );
}


@headers = qw("libpikabase/pikabase.h"
              "text/pikatext-compat.h"
              "pikapdb-utils.h");

@procs = qw(text_font
            text_get_extents_font);

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

$desc = 'Text procedures';
$doc_title = 'pikatexttool';
$doc_short_desc = 'Functions for controlling the text tool.';
$doc_long_desc = 'Functions for controlling the text tool.';

1;