Table
VDMX— vertical device metrics (OT §6.4.20).
Module tableVdmx | Source packages/front/office/fonts/src/table/vdmx.js | Deps fontErrors, fontReader | Worker-safe yes
Provides yMin/yMax per ppem for line-height calculation on Windows.
Exports
| Symbol | Type | Description |
|---|---|---|
parseVdmx |
function | (bytes) => { version, numRecords, numRatios, ratRanges, offsets }. |
tableVdmx |
factory | Factory { name, dependencies, factory }. |
Usage
import fw from '@awacloud/fw';
import { fw_require, modules } from '@awacloud/fonts';
for (const m of [...fw_require, ...modules]) fw.runtime.register(m);
const { parseVdmx } = fw.runtime.resolve('tableVdmx');
const vdmx = parseVdmx(sfnt.tables.VDMX.bytes);
Notes
- Only the header + ratios + offsets are decoded. The vTable groups are left to the application.
- Mainly useful for legacy GDI fidelity.