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import r from '@foliojs-fork/restructure';
let KernPair = new r.Struct({
left: r.uint16,
right: r.uint16,
value: r.int16
});
let ClassTable = new r.Struct({
firstGlyph: r.uint16,
nGlyphs: r.uint16,
offsets: new r.Array(r.uint16, 'nGlyphs'),
max: t => t.offsets.length && Math.max.apply(Math, t.offsets)
});
let Kern2Array = new r.Struct({
off: t => t._startOffset - t.parent.parent._startOffset,
len: t => (((t.parent.leftTable.max - t.off) / t.parent.rowWidth) + 1) * (t.parent.rowWidth / 2),
values: new r.LazyArray(r.int16, 'len')
});
let KernSubtable = new r.VersionedStruct('format', {
0: {
nPairs: r.uint16,
searchRange: r.uint16,
entrySelector: r.uint16,
rangeShift: r.uint16,
pairs: new r.Array(KernPair, 'nPairs')
},
2: {
rowWidth: r.uint16,
leftTable: new r.Pointer(r.uint16, ClassTable, {type: 'parent'}),
rightTable: new r.Pointer(r.uint16, ClassTable, {type: 'parent'}),
array: new r.Pointer(r.uint16, Kern2Array, {type: 'parent'})
},
3: {
glyphCount: r.uint16,
kernValueCount: r.uint8,
leftClassCount: r.uint8,
rightClassCount: r.uint8,
flags: r.uint8,
kernValue: new r.Array(r.int16, 'kernValueCount'),
leftClass: new r.Array(r.uint8, 'glyphCount'),
rightClass: new r.Array(r.uint8, 'glyphCount'),
kernIndex: new r.Array(r.uint8, t => t.leftClassCount * t.rightClassCount)
}
});
let KernTable = new r.VersionedStruct('version', {
0: { // Microsoft uses this format
subVersion: r.uint16, // Microsoft has an extra sub-table version number
length: r.uint16, // Length of the subtable, in bytes
format: r.uint8, // Format of subtable
coverage: new r.Bitfield(r.uint8, [
'horizontal', // 1 if table has horizontal data, 0 if vertical
'minimum', // If set to 1, the table has minimum values. If set to 0, the table has kerning values.
'crossStream', // If set to 1, kerning is perpendicular to the flow of the text
'override' // If set to 1 the value in this table replaces the accumulated value
]),
subtable: KernSubtable,
padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
},
1: { // Apple uses this format
length: r.uint32,
coverage: new r.Bitfield(r.uint8, [
null, null, null, null, null,
'variation', // Set if table has variation kerning values
'crossStream', // Set if table has cross-stream kerning values
'vertical' // Set if table has vertical kerning values
]),
format: r.uint8,
tupleIndex: r.uint16,
subtable: KernSubtable,
padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
}
});
export default new r.VersionedStruct(r.uint16, {
0: { // Microsoft Version
nTables: r.uint16,
tables: new r.Array(KernTable, 'nTables')
},
1: { // Apple Version
reserved: new r.Reserved(r.uint16), // the other half of the version number
nTables: r.uint32,
tables: new r.Array(KernTable, 'nTables')
}
});