CBLC table

Indexes the location and format of color bitmap glyphs within the CBDT table.

Scope

• Format family: Shared SFNT
• Table tag in JSON: CBLC

Specs

• (No explicit spec URL found in implementation source)
• OpenType table registry: https://learn.microsoft.com/en-us/typography/opentype/spec/otff#font-tables

JSON Skeleton

This skeleton reflects fields currently parsed/written by Font Flux JS for this table.

{
  "tables": {
    "CBLC": {
      "firstGlyphIndex": 0,
      "_checksum": 0
    }
  }
}

Top-level Fields

• firstGlyphIndex - number (0..65535)

Additional Nested Keys Seen In Implementation

• indexSubTables
• firstGlyphIndex
• lastGlyphIndex
• indexSubtableOffset
• glyphID
• sbitOffset
• ascender
• descender
• widthMax
• caretSlopeNumerator
• caretSlopeDenominator
• caretOffset
• minOriginSB
• minAdvanceSB
• maxBeforeBL
• minAfterBL
• pad1
• pad2

Notes

• Preserve _checksum for stable round-tripping.
• If a table is only partially understood, prefer keeping unknown bytes in _raw instead of dropping data.
• Validate with .validate() after edits.