Class: Fontisan::Ufo::Compile::VariableOtf

Inherits:
Object
  • Object
show all
Defined in:
lib/fontisan/ufo/compile/variable_otf.rb

Overview

VariableOtf — produces a variable OTF with CFF2 outlines.

The orchestrator assembles a default-master UFO plus variation masters into a variable OpenType font with:

- CFF2 outlines with blend operators for each varying coordinate
- ItemVariationStore embedded in the CFF2 table (regions only;
deltas live in charstring blend operands)
- fvar (axes + instances)
- STAT (style attributes)
- avar (axis remapping, when maps are provided)

See Also:

Instance Method Summary collapse

Constructor Details

#initialize(default_font, master_fonts: [], axes: [], instances: []) ⇒ VariableOtf

Returns a new instance of VariableOtf.

Parameters:

  • default_font (Fontisan::Ufo::Font) —

    the default master

  • master_fonts (Array<Fontisan::Ufo::Font>) (defaults to: []) —

    variation masters

  • axes (Array<Hash>) (defaults to: []) —

    fvar axes (tag, min, default, max, name_id)

  • instances (Array<Hash>) (defaults to: []) —

    named instances



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# File 'lib/fontisan/ufo/compile/variable_otf.rb', line 25

def initialize(default_font, master_fonts: [], axes: [], instances: [])
  @default = default_font
  @masters = master_fonts
  @axes = axes
  @instances = instances
end

Instance Method Details

#build_tables ⇒ Hash<String,String>

Build all tables for the variable OTF.

Returns:

  • (Hash<String,String>) —

    table tag → bytes



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# File 'lib/fontisan/ufo/compile/variable_otf.rb', line 47

def build_tables
  glyphs = @default.glyphs.values

  tables = {
    "head" => Head.build(@default, glyphs: glyphs, loca_format: Head::LOCA_FORMAT_LONG),
    "hhea" => Hhea.build(@default, glyphs: glyphs),
    "maxp" => Maxp.build(@default, glyphs: glyphs, version: Maxp::VERSION_OPEN_TYPE),
    "OS/2" => Os2.build(@default, glyphs: glyphs),
    "name" => Name.build(@default),
    "post" => Post.build(@default),
    "hmtx" => Hmtx.build(@default, glyphs: glyphs),
    "cmap" => Cmap.build(@default, glyphs: glyphs),
    "CFF2" => build_cff2(glyphs),
    "fvar" => Fvar.build(@default, axes: @axes, instances: @instances),
    "STAT" => Stat.build(axes: @axes),
  }

  avar_bytes = Avar.build(axes: @axes)
  tables["avar"] = avar_bytes if avar_bytes

  tables
end

#compile(output_path:) ⇒ String

Compile the variable OTF directly to the output path.

Parameters:

  • output_path (String) —

    output file path

Returns:

  • (String) —

    the output path



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# File 'lib/fontisan/ufo/compile/variable_otf.rb', line 35

def compile(output_path:)
  tables = build_tables
  Fontisan::FontWriter.write_to_file(
    tables.transform_values { |t| t.is_a?(String) ? t : t.to_binary_s },
    output_path,
    sfnt_version: 0x4F54544F,
  )
  output_path
end