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Update Name to match structure of parseCmap.

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This commit is contained in:
Steven Edwards 2015-09-05 04:18:33 -04:00
parent e259c188c8
commit a05e60ea09
1 changed files with 27 additions and 3 deletions
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30
truetype/truetype.go
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@ -413,6 +413,20 @@ func (f *Font) Index(x rune) Index {
// Name returns the NameID value of a Font.
// Returns "" on error or not found.
func (f *Font) Name(id NameID) string {
const (
cmapFormat4 = 4
cmapFormat12 = 12
languageIndependent = 0
// A 32-bit encoding consists of a most-significant 16-bit Platform ID and a
// least-significant 16-bit Platform Specific ID. The magic numbers are
// specified at https://www.microsoft.com/typography/otspec/name.htm
unicodeEncoding = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0)
microsoftSymbolEncoding = 0x00030000 // PID = 3 (Microsoft), PSID = 0 (Symbol)
microsoftUCS2Encoding = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
microsoftUCS4Encoding = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4)
)
if len(f.name) < 18 { // The name table is three uint16s + at least one Name Record. Name Records are six uint16s.
return ""
}
@ -435,10 +449,20 @@ func (f *Font) Name(id NameID) string {
}
nameID := NameID(u16(f.name, offset+6))
// Find the first matching nameID, regardless of platform.
// Find the nameID of interest.
if nameID == id {
valueOffset, valueLength, pid = u16(f.name, offset+10), u16(f.name, offset+8), u16(f.name, offset)
break
pidPsid := u32(f.name, offset)
// We prefer the Unicode encoding. Failing to find that, we fall
// back onto the Microsoft encoding.
if pidPsid == unicodeEncoding {
valueOffset, valueLength, pid = u16(f.name, offset+10), u16(f.name, offset+8), uint16(pidPsid>>16)
break
} else if pidPsid == microsoftSymbolEncoding ||
pidPsid == microsoftUCS2Encoding ||
pidPsid == microsoftUCS4Encoding {
valueOffset, valueLength, pid = u16(f.name, offset+10), u16(f.name, offset+8), uint16(pidPsid>>16)
// We don't break out of the for loop, so that Unicode can override Microsoft.
}
}
}