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freetype/truetype: support symbol fonts such as Webdings. 

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/60380043
This commit is contained in:
Nigel Tao 2014-02-06 10:38:58 +11:00
parent 49fa4a4de0
commit e009753234
1 changed files with 11 additions and 5 deletions
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16
freetype/truetype/truetype.go
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@ -119,10 +119,12 @@ func (f *Font) parseCmap() error {
languageIndependent = 0
// A 32-bit encoding consists of a most-significant 16-bit Platform ID and a
// least-significant 16-bit Platform Specific ID.
unicodeEncoding = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0)
microsoftUCS2Encoding = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
microsoftUCS4Encoding = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4)
// 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.cmap) < 4 {
@ -143,7 +145,11 @@ func (f *Font) parseCmap() error {
if pidPsid == unicodeEncoding {
offset, found = int(o), true
break
} else if pidPsid == microsoftUCS2Encoding || pidPsid == microsoftUCS4Encoding {
} else if pidPsid == microsoftSymbolEncoding ||
pidPsid == microsoftUCS2Encoding ||
pidPsid == microsoftUCS4Encoding {
offset, found = int(o), true
// We don't break out of the for loop, so that Unicode can override Microsoft.
}