diff options
Diffstat (limited to 'vendor/github.com/golang/freetype/truetype/truetype.go')
| -rw-r--r-- | vendor/github.com/golang/freetype/truetype/truetype.go | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/vendor/github.com/golang/freetype/truetype/truetype.go b/vendor/github.com/golang/freetype/truetype/truetype.go index 613fc17..7270bbf 100644 --- a/vendor/github.com/golang/freetype/truetype/truetype.go +++ b/vendor/github.com/golang/freetype/truetype/truetype.go @@ -57,7 +57,8 @@ const ( // 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) + unicodeEncodingBMPOnly = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0 BMP Only) + unicodeEncodingFull = 0x00000004 // PID = 0 (Unicode), PSID = 4 (Unicode 2.0 Full Repertoire) 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) @@ -142,7 +143,7 @@ func parseSubtables(table []byte, name string, offset, size int, pred func([]byt pidPsid := u32(table, offset) // We prefer the Unicode cmap encoding. Failing to find that, we fall // back onto the Microsoft cmap encoding. - if pidPsid == unicodeEncoding { + if pidPsid == unicodeEncodingBMPOnly || pidPsid == unicodeEncodingFull { bestOffset, bestPID, ok = offset, pidPsid>>16, true break @@ -323,11 +324,20 @@ func (f *Font) parseKern() error { if version != 0 { return UnsupportedError(fmt.Sprintf("kern version: %d", version)) } + n, offset := u16(f.kern, offset), offset+2 - if n != 1 { - return UnsupportedError(fmt.Sprintf("kern nTables: %d", n)) - } - offset += 2 + if n == 0 { + return UnsupportedError("kern nTables: 0") + } + // TODO: support multiple subtables. In practice, almost all .ttf files + // have only one subtable, if they have a kern table at all. But it's not + // impossible. Xolonium Regular (https://fontlibrary.org/en/font/xolonium) + // has 3 subtables. Those subtables appear to be disjoint, rather than + // being the same kerning pairs encoded in three different ways. + // + // For now, we'll use only the first subtable. + + offset += 2 // Skip the version. length, offset := int(u16(f.kern, offset)), offset+2 coverage, offset := u16(f.kern, offset), offset+2 if coverage != 0x0001 { @@ -550,8 +560,7 @@ func parse(ttf []byte, offset int) (font *Font, err error) { return } ttcVersion, offset := u32(ttf, offset), offset+4 - if ttcVersion != 0x00010000 { - // TODO: support TTC version 2.0, once I have such a .ttc file to test with. + if ttcVersion != 0x00010000 && ttcVersion != 0x00020000 { err = FormatError("bad TTC version") return } @@ -578,14 +587,15 @@ func parse(ttf []byte, offset int) (font *Font, err error) { return } n, offset := int(u16(ttf, offset)), offset+2 - if len(ttf) < 16*n+12 { + offset += 6 // Skip the searchRange, entrySelector and rangeShift. + if len(ttf) < 16*n+offset { err = FormatError("TTF data is too short") return } f := new(Font) // Assign the table slices. for i := 0; i < n; i++ { - x := 16*i + 12 + x := 16*i + offset switch string(ttf[x : x+4]) { case "cmap": f.cmap, err = readTable(ttf, ttf[x+8:x+16]) |