Class: Fontisan::Audit::Checks::CmapCheck

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

Overview

Validates cmap subtable invariants per the OpenType spec:

- At least one Unicode-encoded subtable is present
- Format 4: segCountX2 must equal segCount × 2
- Format 4: the last segment must have endCode 0xFFFF
- Format 4: reservedPad must be 0
- Format 12: groups must be sorted and non-overlapping
- Format 12: each group startCharCode ≤ endCharCode
- Subtable offsets must be within the cmap table bounds

Catches the most common real-world cmap bugs that renderers and text shapers reject silently.

See Also:

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/cmap_check.rb', line 25

def self.call(font)
  return [] unless font.has_table?("cmap")

  raw = font.table_data["cmap"]
  return [] unless raw

  issues = []
  issues.concat(validate_header(raw))
  return issues unless issues.empty?

  records = read_encoding_records(raw)
  issues.concat(validate_unicode_presence(records))
  issues.concat(validate_subtables(raw, records))
  issues
end

.code ⇒ Object 



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# File 'lib/fontisan/audit/checks/cmap_check.rb', line 41

def self.code
  :cmap
end