FontConfig

FontConfig-raku

Raku interface to the FontConfig native library

Synopsis

use FontConfig;

# %ENV{FONTCONFIG_FILE} = 'my-fonts.conf';
my FontConfig:D $patt .= parse: 'Arial:style<italic>';
# -- OR --
$patt .= new: :family<Arial>, :style<italic>;
$patt.weight = 'bold';
say $patt.Str;
# Arial:style=italic:weight=205
my FontConfig $match = $patt.match;
say $match.format('%{file}');
say $match.file;
# e.g. /usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf

Description

Bindings to the FontConfig library.

At this stage, enough of the library is implemented to enable FontConfig patterns to be parsed or built, and the best matching font to be located.

Methods

new

method new(*%atts --> FontConfig)

Create a new pattern for font matching purposes

parse

method parse(Str $patt --> FontConfig)

Create a new pattern from a parsed FontConfig pattern.

AT-KEY, ASSIGN-KEY, keys, elems, pairs, values

$patt<weight> = 205;
$patt<weight> = 'bold';
say $patt<weight>;
$patt<weight>:delete;

This module provides am associative interface to FontConfig properties.

match

method match(--> FontConfig)

This method performs FontConfig matching and returns the system font that best matches this pattern.

The matched object is populated with the actual font properties. The file property contains the path to the font.

my $match = $pattern.match;
say 'matched font: ' ~ $match<fullname>;
say 'actual weight: ' ~ $match<weight>;
say 'font file: ' ~ $match<file>;

constant

method constant(Str $name --> UInt)

These are symbolic constants that can be used for numeric properties.

my \bold = FontConfig.constant("bold");
if $match<bold> >= bold {
    say "matching font is bold";
}

Note that symbolic constant lookup is performed if a string is assigned to a numeric property. So

$match<weight> = "extrabold";

Is equivalent to:

$match<weight> = FontConfig.constant("extrabold");

Property Accessors

The Raku FontConfig bindings provide automatic accessors for known properties

$patt.weight = 'bold';
say $patt.weight;