vyaz-monorepo / core/src / MeasureProfile

Interface: MeasureProfile

Defined in: core/src/measure/FontkitMeasureContext.ts:75

How widths are computed from the font tables.

• 'advance' (default) — Σ per-code-point advanceWidth. Fast, and shaping-invariant, but ignores kerning and ligatures, so it drifts from what a browser paints (up to a few px per word on a kerned Latin font).
• 'shape' — fontkit layout() advance: GPOS kerning + GSUB (liga, clig, calt, ccmp), i.e. browser-default behaviour. Use for the SVG browser preset when on-screen width has to match the layout.

Properties

advanceQuantum?

optional advanceQuantum?: number

Defined in: core/src/measure/FontkitMeasureContext.ts:98

Round every glyph advance to a multiple of this many px (PowerPoint lays glyphs out on a 1/8 pt grid: all 266 glyphs of a Roboto / Times New Roman alphabet at 20 and 11pt were exact multiples of 0.125pt, equal to the font advance rounded to nearest). Kerning is added on top, unrounded. Ignored when unset or 0.

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engine

engine: "advance" | "shape"

Defined in: core/src/measure/FontkitMeasureContext.ts:76

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features?

optional features?: Record<string, boolean>

Defined in: core/src/measure/FontkitMeasureContext.ts:78

'shape' only — OpenType feature overrides, e.g. { liga: false }.

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kernMinSize?

optional kernMinSize?: number

Defined in: core/src/measure/FontkitMeasureContext.ts:85

'shape' only — kerning applies just to text at fontSize >= kernMinSize (smaller text is shaped with kern: false). Mirrors DrawingML's <a:rPr kern="1200"> "kerning for fonts N points and above", whose Office default is 12pt.

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kernRequiresTable?

optional kernRequiresTable?: boolean

Defined in: core/src/measure/FontkitMeasureContext.ts:91

'shape' only — kern only fonts that carry a classic kern table. PowerPoint kerns Times New Roman / Arial / Calibri (kern table) but never Roboto / Inter (GPOS only): measured on Roboto at 11, 16, 20, 24 and 72pt, no pair ever kerns.

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opticalSizing?

optional opticalSizing?: boolean

Defined in: core/src/measure/FontkitMeasureContext.ts:104

Instance fonts with a free opsz axis at the used size, like CSS font-optical-sizing: auto (see opticalSizeInstance). On unless false; mode: 'office' turns it off (PowerPoint was never measured doing it).