Module: Fontisan::Ufo::Compile::Fvar

Defined in:
lib/fontisan/ufo/compile/fvar.rb

Overview

Builds the OpenType fvar (Font Variations) table from a list of axis definitions and named instances.

See Also:

Constant Summary collapse

VERSION_MAJOR = 
1
VERSION_MINOR = 
0
AXIS_SIZE = 
20
INSTANCE_SIZE =
  • 4 per axis
4
FIXED_SHIFT = 
16
FIXED_ONE = 
1 << FIXED_SHIFT

Class Method Summary collapse

Class Method Details

.build(font, axes: nil, instances: nil) ⇒ String?

Returns fvar table bytes, or nil if no axes.

Parameters:

  • font (Fontisan::Ufo::Font)
  • axes (Array<Hash>) (defaults to: nil) —

    axis definitions

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

    named instance definitions

Returns:

  • (String, nil) —

    fvar table bytes, or nil if no axes



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# File 'lib/fontisan/ufo/compile/fvar.rb', line 22

def self.build(font, axes: nil, instances: nil)
  axes ||= font.info.respond_to?(:axes) ? font.info.axes : nil
  instances ||= font.info.respond_to?(:named_instances) ? font.info.named_instances : nil

  axes ||= []
  return nil if axes.empty?

  axes_bytes = build_axes(axes)
  instances_bytes = build_instances(instances || [], axes.size)
  header = build_header(axes.size, axes_bytes, instances_bytes, instances)
  header + axes_bytes + instances_bytes
end