libui/_doc/export/ctwidths

xx pseudo-go

func (f *CTFont) RegistryWidth32() float32 {
	metadata visual descriptors
	{ "med", float32as(0.000000, 0x0) },
	{ "cond", float32as(-0.200000, 0xbe4ccccd) },
	{ "ext", float32as(0.200000, 0x3e4ccccd) },

	style dictionary
	{ "Extra Compressed", float32as(-0.700000, 0xbf333333) },
	{ "Ultra Compressed", float32as(-0.700000, 0xbf333333) },
	{ "Ultra Condensed", float32as(-0.700000, 0xbf333333) },
	{ "Extra Condensed", float32as(-0.500000, 0xbf000000) },
	{ "Extra Extended", float32as(0.400000, 0x3ecccccd) },
	{ "Ext Compressed", float32as(-0.700000, 0xbf333333) },
	{ "Ultra Expanded", float32as(0.800000, 0x3f4ccccd) },
	{ "Ultra Extended", float32as(0.800000, 0x3f4ccccd) },
	{ "Extra Expanded", float32as(0.400000, 0x3ecccccd) },
	xx TODO this is weird, but correct...
	{ "Semi Condensed", float32as(-0.700000, 0xbf333333) },
	{ "Semi Condensed", float32as(-0.100000, 0xbdcccccd) },
	xx end TODO
	{ "Ext Condensed", float32as(-0.500000, 0xbf000000) },
	{ "SemiCondensed", float32as(-0.100000, 0xbdcccccd) },
	{ "ExtraExpanded", float32as(0.400000, 0x3ecccccd) },
	{ "Semi Expanded", float32as(0.100000, 0x3dcccccd) },
	{ "Semi Extended", float32as(0.100000, 0x3dcccccd) },
	{ "Ext Expanded", float32as(0.400000, 0x3ecccccd) },
	{ "Ext Extended", float32as(0.400000, 0x3ecccccd) },
	{ "SemiExpanded", float32as(0.100000, 0x3dcccccd) },
	{ "Extra Narrow", float32as(-0.500000, 0xbf000000) },
	{ "ExtraNarrow", float32as(-0.500000, 0xbf000000) },
	{ "Extra Wide", float32as(0.800000, 0x3f4ccccd) },
	{ "Ultra Cond", float32as(-0.700000, 0xbf333333) },
	{ "Compressed", float32as(-0.500000, 0xbf000000) },
	{ "Extra Cond", float32as(-0.500000, 0xbf000000) },
	{ "Semi Cond", float32as(-0.100000, 0xbdcccccd) },
	{ "Condensed", float32as(-0.200000, 0xbe4ccccd) },
	{ "ExtraWide", float32as(0.800000, 0x3f4ccccd) },
	{ "Extended", float32as(0.200000, 0x3e4ccccd) },
	{ "Expanded", float32as(0.200000, 0x3e4ccccd) },
	{ "Ext Cond", float32as(-0.500000, 0xbf000000) },
	{ "Narrow", float32as(-0.400000 , 0xbecccccd) },
	{ "Compact", float32as(-0.400000, 0xbecccccd) },
	{ "Cond", float32as(-0.200000, 0xbe4ccccd) },
	{ "Wide", float32as(0.600000, 0x3f19999a) },
	{ "Thin", float32as(-0.700000, 0xbf333333) },

	get os2 table
	if os2table.Len() >= 78 {
		usWidthClass := uint16be(b[6:8]) - 1
		xx this handles the case where the original usWidthClass == 0
		if usWidthClass > 8 {
			panose := b[0x23] - 2
			if panose > 6 {
				xx TODO
			} else {
				switch panose {
				case 0, 1, 2:
					width = float32as(0.000000, 0x0)
				case 3:
					width = float32as(0.200000, 0x3e4ccccd)
				case 4:
					width = float32as(-0.200000, 0xbe4ccccd)
				case 5:
					width = float32as(0.400000, 0x3ecccccd)
				case 6:
					width = float32as(-0.400000, 0xbecccccd)
				}
			}
		}
		switch usWidthClass {
		case 0:
			width = float32as(-0.700000, 0xbf333333)
		case 1:
			width = float32as(-0.500000, 0xbf000000)
		case 2:
			width = float32as(-0.200000, 0xbe4ccccd)
		case 3:
			width = float32as(-0.100000, 0xbdcccccd)
		case 4:
			width = float32as(0.000000, 0x0)
		case 5:
			width = float32as(0.100000, 0x3dcccccd)
		case 6:
			width = float32as(0.400000, 0x3ecccccd)
		case 7:
			width = float32as(0.600000, 0x3f19999a)
		case 8:
			width = float32as(0.800000, 0x3f4ccccd)
		}
	}

	headtable := f.CopyTable('head')
	if headtable != nil {
		if headtable.Len() >= 54 {
			x := b[0x2d]
			if (x & 0x20) != 0 {
				width = float32as(-0.200000, 0xbe4ccccd)
			} else if (x & 0x40) != 0 {
				width = float32as(0.200000, 0x3e4ccccd)
			}
		}
	}

	xx and if all else fails
	return float32as(0.000000, 0x0)
}

func (f *CTFont) Width() float64 {
	if f.IsRegistered() {
		return f.RegistryWidth()
	}

	width := 0.0
	hasWidth := false

	if there is an OS2 table {
		var usWidthClass uint16

		valid := false
		if it's 78 bytes or more {
			usWidthClass = uint16be(table[6:8])
			if usWeightClass <= 10 {
				valid = true
			} else {
				valid = false
			}
		} else {
			usWidthClass = 0
			valid = true
		}
		if valid {
			ten := float64as(10.000000, 0x4024000000000000)
			negPointFive := float64as(-0.500000, 0xbfe0000000000000)
			width = (float64(usWidthClass) div ten) + negPointFive
			hasWidth = true
		}
	}

	then there's the style glossary strings comparison:
	{ "semi condensed", float32as(-0.100000, 0xbdcccccd) },
	{ "extra expanded", float32as(0.400000, 0x3ecccccd) },
	{ "semicondensed", float32as(-0.100000, 0xbdcccccd) },
	{ "extraexpanded", float32as(0.400000, 0x3ecccccd) },
	{ "semi expanded", float32as(0.100000, 0x3dcccccd) },
	{ "semiexpanded", float32as(0.100000, 0x3dcccccd) },
	{ "extra narrow", float32as(-0.500000, 0xbf000000) },
	{ "extranarrow", float32as(-0.500000, 0xbf000000) },
	{ "extra wide", float32as(0.800000, 0x3f4ccccd) },
	{ "condensed", float32as(-0.200000, 0xbe4ccccd) },
	{ "extrawide", float32as(0.800000, 0x3f4ccccd) },
	{ "extended", float32as(0.200000, 0x3e4ccccd) },
	{ "expanded", float32as(0.200000, 0x3e4ccccd) },
	{ "narrow", float32as(-0.400000, 0xbecccccd) },
	{ "wide", float32as(0.600000, 0x3f19999a) },
	{ "thin", float32as(-0.700000, 0xbf333333) },

	otherwise just return float64as(0.000000, 0x0)
}