Class: Fontisan::Audit::Checks::OpenTypeConformanceCheck

Inherits:
Fontisan::Audit::Check show all
Defined in:
lib/fontisan/audit/checks/opentype_conformance_check.rb

Overview

Foundational OpenType spec conformance checks. Covers the most commonly-violated "MUST" and "SHOULD" rules from the OT spec that other check domains don't already cover.

This check is intentionally a growing foundation — new OT spec rules are added incrementally as real-world fonts surface them. Full OT conformance is a long-running effort that tracks the spec's evolution (axis 14 per TODO #03).

Current checks:

- Required tables for each sfnt flavor (TTF vs CFF vs variable)
- head.indexToLocFormat consistency with loca table size
- name table must have at least family (1), subfamily (2),
full (4), PostScript (6) name IDs
- OS/2 fsSelection must not use reserved bits
- hhea.numberOfHMetrics must be ≤ maxp.numGlyphs
- post table version must be valid
- cmap must have at least one Unicode subtable (already
covered by CmapCheck — skipped here to avoid duplicate issues)

See Also:

Constant Summary collapse

REQUIRED_NAME_IDS = 
{
  1 => "Family",
  2 => "Subfamily",
  4 => "Full",
  6 => "PostScript",
}.freeze

Class Method Summary collapse

Methods inherited from Fontisan::Audit::Check

issue

Class Method Details

.call(font) ⇒ Array<Models::ValidationReport::Issue>

Parameters:

Returns:



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# File 'lib/fontisan/audit/checks/opentype_conformance_check.rb', line 38

def self.call(font)
  issues = []
  issues.concat(validate_required_tables(font))
  issues.concat(validate_loca_format(font))
  issues.concat(validate_name_coverage(font))
  issues.concat(validate_os2_fsselection(font))
  issues.concat(validate_hhea_metrics(font))
  issues
end

.code ⇒ Object 



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# File 'lib/fontisan/audit/checks/opentype_conformance_check.rb', line 48

def self.code
  :opentype_conformance
end