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import r from 'restructure';
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// VDMX tables contain ascender/descender overrides for certain (usually small)
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// sizes. This is needed in order to match font metrics on Windows.
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let Ratio = new r.Struct({
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bCharSet: r.uint8, // Character set
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xRatio: r.uint8, // Value to use for x-Ratio
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yStartRatio: r.uint8, // Starting y-Ratio value
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yEndRatio: r.uint8 // Ending y-Ratio value
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});
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let vTable = new r.Struct({
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yPelHeight: r.uint16, // yPelHeight to which values apply
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yMax: r.int16, // Maximum value (in pels) for this yPelHeight
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yMin: r.int16 // Minimum value (in pels) for this yPelHeight
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});
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let VdmxGroup = new r.Struct({
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recs: r.uint16, // Number of height records in this group
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startsz: r.uint8, // Starting yPelHeight
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endsz: r.uint8, // Ending yPelHeight
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entries: new r.Array(vTable, 'recs') // The VDMX records
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});
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export default new r.Struct({
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version: r.uint16, // Version number (0 or 1)
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numRecs: r.uint16, // Number of VDMX groups present
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numRatios: r.uint16, // Number of aspect ratio groupings
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ratioRanges: new r.Array(Ratio, 'numRatios'), // Ratio ranges
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offsets: new r.Array(r.uint16, 'numRatios'), // Offset to the VDMX group for this ratio range
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groups: new r.Array(VdmxGroup, 'numRecs') // The actual VDMX groupings
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});
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