use HarfBuzz::Shaper;

#| HarfBuzz / Cairo shaping integration
unit class HarfBuzz::Shaper::Cairo:ver<0.0.5>
    is HarfBuzz::Shaper;



head

use HarfBuzz::Shaper::Cairo :&cairo-glyphs;
use HarfBuzz::Shaper;
use Cairo;
my Cairo::Glyphs $glyphs;
my $file = 't/fonts/NimbusRoman-Regular.otf';
my $text = 'Hell€!';
# -- functional interface --
my HarfBuzz::Shaper $shaper .= new: :font{:$file}, :buf{:$text};
$glyphs = cairo-glyphs($shaper);
# -- OO interface --
my HarfBuzz::Shaper::Cairo $shaper2 .= new: :font{:$file}, :buf{:$text};
$glyphs = $shaper2.cairo-glyphs;
# -- FreeType integration --
use Font::FreeType;
use Font::FreeType::Face;
use Harfbuzz::Shaper::Cairo::Font;
my Font::FreeType::Face $ft-face = Font::FreeType.face: $file;
my Harfbuzz::Shaper::Cairo::Font $font .= new: :$file;
my HarfBuzz::Shaper::Cairo $shaper3 .= $font.shaper: {:$text};
$glyphs = $shaper3.cairo-glyphs;


This module compiles a set of shaped glyphs into a Cairo::Glyphs object; suitable for use by the Cairo::Context `show_glyphs()` and `glyph_path()` methods.


Please see the `examples/` folder, for a full working example.



use Cairo;
#| Return a set of Cairo compatible shaped glyphs
method cairo-glyphs(
    HarfBuzz::Shaper:D $shaper:
    Numeric :x($x0) = 0e0,
    Numeric :y($y0) = 0e0,
    |c --> Cairo::Glyphs
) is export(:cairo-glyphs) {
    my Cairo::Glyphs $cairo-glyphs .= new: :elems($shaper.buf.length);
    my Cairo::cairo_glyph_t $cairo-glyph;
    my int $i = 0;
    my Num $x = $x0.Num;
    my Num $y = $y0.Num;

    for $shaper.shape(|c) -> $glyph {
        given $cairo-glyphs[$i++] {
            .index = $glyph.gid;
            .x = $x + $glyph.x-offset;
            .y = $y + $glyph.y-offset;
            $x += $glyph.x-advance;
            $y += $glyph.y-advance;
        }
    }

    $cairo-glyphs.x-advance = $x - $x0;
    $cairo-glyphs.y-advance = $y - $y0;

    $cairo-glyphs;
}


The returned object is typically passed to either the Cairo::Context show_glyphs() or glyph_path() methods


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Cairo

Synopsis

Description

Methods

HarfBuzz::Shaper::Cairo v0.0.5

Authors

License

Dependencies

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