awaforge

tableMaxp

AGPL-3.0-onlyRelease 2L4

Table maxp — Maximum Profile (OT §6.4.6).

Module tableMaxp | Source packages/front/office/fonts/src/table/maxp.js | Deps fontErrors, fontReader, fontWriter | Worker-safe yes

Two versions:

  • v0.5 (0x00005000) — 6 bytes: version + numGlyphs. Used by CFF fonts.
  • v1.0 (0x00010000) — 32 bytes: v0.5 + 13 TrueType maxima (maxPoints, maxContours, maxCompositePoints, …).

Resolve

const { parseMaxp, encodeMaxp, MAXP_V0_5, MAXP_V1_0 } = runtime.resolve('tableMaxp');

API

Method Signature Returns
parseMaxp (bytes: Uint8Array) => MaxpTable Throws on unknown version or insufficient size.
encodeMaxp (maxp: MaxpTable) => Uint8Array Emits 6 bytes in v0.5, 32 in v1.0.
MAXP_V0_5 number 0x00005000.
MAXP_V1_0 number 0x00010000.

MaxpTable

version: number, numGlyphs: number, plus in v1.0: maxPoints, maxContours, maxCompositePoints, maxCompositeContours, maxZones, maxTwilightPoints, maxStorage, maxFunctionDefs, maxInstructionDefs, maxStackElements, maxSizeOfInstructions, maxComponentElements, maxComponentDepth.

Examples

const { parseMaxp, MAXP_V1_0 } = runtime.resolve('tableMaxp');
const maxp = parseMaxp(sfnt.tables.maxp.bytes);
if (maxp.version === MAXP_V1_0) console.log(maxp.maxPoints);

Notes

  • In v1.0, the 13 maxima fields are not verified against glyf's actual maxima — that check is left to the caller (subset / build tools).
  • numGlyphs is capped at 0xFFFF (the OT uint16 ceiling); exceeding it throws ParseError('fonts/maxp-numglyphs-cap').
  • Any version outside {v0.5, v1.0} throws ParseError('fonts/maxp-version').

See also

  • head
  • glyf — bounds the maxima values