Module: Fontisan::Stitcher::GlyphSignature

Defined in:

lib/fontisan/stitcher/glyph_signature.rb

Overview

Stateless signature computation for a Ufo::Glyph's visual identity.

Two glyphs with the same signature are visually interchangeable and can share a gid in the output font. The signature captures advance width, every contour's points (x, y, type), and every component reference (base glyph + transform presence).

Used by Deduplicator to merge identical outlines from different donors, reducing the glyph count below the TrueType 65,535 cap.

Class Method Summary

• .for(glyph) ⇒ String

  SHA-256 hex digest of the glyph's outline identity.

Class Method Details

.for(glyph) ⇒ String

Returns SHA-256 hex digest of the glyph's outline identity.

Parameters:

• glyph (Fontisan::Ufo::Glyph)

Returns:

• (String) —

  SHA-256 hex digest of the glyph's outline identity

# File 'lib/fontisan/stitcher/glyph_signature.rb', line 19

def self.for(glyph)
  Digest::SHA256.hexdigest(canonical_representation(glyph))
end