font/sfnt: implement Font.GlyphName.
This is based on the post table in the sfnt file. Change-Id: I11f7a9bd9024cfc8f92adc5abb4d5356521f0df7 Reviewed-on: https://go-review.googlesource.com/36972 Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Nigel Tao
parent
153d857a8f
commit
8491f88afc
68
font/sfnt/data.go
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68
font/sfnt/data.go
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@ -0,0 +1,68 @@
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// generated by go run gen.go; DO NOT EDIT
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package sfnt
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const numBuiltInPostNames = 258
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const builtInPostNamesData = "" +
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".notdef.nullnonmarkingreturnspaceexclamquotedblnumbersigndollarp" +
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"ercentampersandquotesingleparenleftparenrightasteriskpluscommahy" +
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"phenperiodslashzeroonetwothreefourfivesixseveneightninecolonsemi" +
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"colonlessequalgreaterquestionatABCDEFGHIJKLMNOPQRSTUVWXYZbracket" +
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"leftbackslashbracketrightasciicircumunderscoregraveabcdefghijklm" +
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"nopqrstuvwxyzbraceleftbarbracerightasciitildeAdieresisAringCcedi" +
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"llaEacuteNtildeOdieresisUdieresisaacuteagraveacircumflexadieresi" +
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"satildearingccedillaeacuteegraveecircumflexedieresisiacuteigrave" +
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"icircumflexidieresisntildeoacuteograveocircumflexodieresisotilde" +
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"uacuteugraveucircumflexudieresisdaggerdegreecentsterlingsectionb" +
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"ulletparagraphgermandblsregisteredcopyrighttrademarkacutedieresi" +
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"snotequalAEOslashinfinityplusminuslessequalgreaterequalyenmupart" +
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"ialdiffsummationproductpiintegralordfeminineordmasculineOmegaaeo" +
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"slashquestiondownexclamdownlogicalnotradicalflorinapproxequalDel" +
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"taguillemotleftguillemotrightellipsisnonbreakingspaceAgraveAtild" +
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"eOtildeOEoeendashemdashquotedblleftquotedblrightquoteleftquoteri" +
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"ghtdividelozengeydieresisYdieresisfractioncurrencyguilsinglleftg" +
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"uilsinglrightfifldaggerdblperiodcenteredquotesinglbasequotedblba" +
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"seperthousandAcircumflexEcircumflexAacuteEdieresisEgraveIacuteIc" +
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"ircumflexIdieresisIgraveOacuteOcircumflexappleOgraveUacuteUcircu" +
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"mflexUgravedotlessicircumflextildemacronbrevedotaccentringcedill" +
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"ahungarumlautogonekcaronLslashlslashScaronscaronZcaronzcaronbrok" +
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"enbarEthethYacuteyacuteThornthornminusmultiplyonesuperiortwosupe" +
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"riorthreesuperioronehalfonequarterthreequartersfrancGbrevegbreve" +
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"IdotaccentScedillascedillaCacutecacuteCcaronccarondcroat"
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var builtInPostNamesOffsets = [...]uint16{
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0x0000, 0x0007, 0x000c, 0x001c, 0x0021, 0x0027, 0x002f, 0x0039,
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0x003f, 0x0046, 0x004f, 0x005a, 0x0063, 0x006d, 0x0075, 0x0079,
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0x007e, 0x0084, 0x008a, 0x008f, 0x0093, 0x0096, 0x0099, 0x009e,
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0x00a2, 0x00a6, 0x00a9, 0x00ae, 0x00b3, 0x00b7, 0x00bc, 0x00c5,
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0x00c9, 0x00ce, 0x00d5, 0x00dd, 0x00df, 0x00e0, 0x00e1, 0x00e2,
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0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7, 0x00e8, 0x00e9, 0x00ea,
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0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef, 0x00f0, 0x00f1, 0x00f2,
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0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7, 0x00f8, 0x00f9, 0x0104,
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0x010d, 0x0119, 0x0124, 0x012e, 0x0133, 0x0134, 0x0135, 0x0136,
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0x0137, 0x0138, 0x0139, 0x013a, 0x013b, 0x013c, 0x013d, 0x013e,
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0x013f, 0x0140, 0x0141, 0x0142, 0x0143, 0x0144, 0x0145, 0x0146,
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0x0147, 0x0148, 0x0149, 0x014a, 0x014b, 0x014c, 0x014d, 0x0156,
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0x0159, 0x0163, 0x016d, 0x0176, 0x017b, 0x0183, 0x0189, 0x018f,
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0x0198, 0x01a1, 0x01a7, 0x01ad, 0x01b8, 0x01c1, 0x01c7, 0x01cc,
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0x01d4, 0x01da, 0x01e0, 0x01eb, 0x01f4, 0x01fa, 0x0200, 0x020b,
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0x0214, 0x021a, 0x0220, 0x0226, 0x0231, 0x023a, 0x0240, 0x0246,
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0x024c, 0x0257, 0x0260, 0x0266, 0x026c, 0x0270, 0x0278, 0x027f,
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0x0285, 0x028e, 0x0298, 0x02a2, 0x02ab, 0x02b4, 0x02b9, 0x02c1,
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0x02c9, 0x02cb, 0x02d1, 0x02d9, 0x02e2, 0x02eb, 0x02f7, 0x02fa,
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0x02fc, 0x0307, 0x0310, 0x0317, 0x0319, 0x0321, 0x032c, 0x0338,
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0x033d, 0x033f, 0x0345, 0x0351, 0x035b, 0x0365, 0x036c, 0x0372,
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0x037d, 0x0382, 0x038f, 0x039d, 0x03a5, 0x03b5, 0x03bb, 0x03c1,
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0x03c7, 0x03c9, 0x03cb, 0x03d1, 0x03d7, 0x03e3, 0x03f0, 0x03f9,
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0x0403, 0x0409, 0x0410, 0x0419, 0x0422, 0x042a, 0x0432, 0x043f,
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0x044d, 0x044f, 0x0451, 0x045a, 0x0468, 0x0476, 0x0482, 0x048d,
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0x0498, 0x04a3, 0x04a9, 0x04b2, 0x04b8, 0x04be, 0x04c9, 0x04d2,
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0x04d8, 0x04de, 0x04e9, 0x04ee, 0x04f4, 0x04fa, 0x0505, 0x050b,
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0x0513, 0x051d, 0x0522, 0x0528, 0x052d, 0x0536, 0x053a, 0x0541,
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0x054d, 0x0553, 0x0558, 0x055e, 0x0564, 0x056a, 0x0570, 0x0576,
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0x057c, 0x0585, 0x0588, 0x058b, 0x0591, 0x0597, 0x059c, 0x05a1,
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0x05a6, 0x05ae, 0x05b9, 0x05c4, 0x05d1, 0x05d8, 0x05e2, 0x05ef,
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0x05f4, 0x05fa, 0x0600, 0x060a, 0x0612, 0x061a, 0x0620, 0x0626,
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0x062c, 0x0632, 0x0638,
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}
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321
font/sfnt/gen.go
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321
font/sfnt/gen.go
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@ -0,0 +1,321 @@
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"bytes"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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)
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func main() {
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data, offsets := []byte(nil), []int{0}
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for _, name := range names {
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data = append(data, name...)
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offsets = append(offsets, len(data))
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}
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b := new(bytes.Buffer)
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fmt.Fprintf(b, "// generated by go run gen.go; DO NOT EDIT\n\n")
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fmt.Fprintf(b, "package sfnt\n\n")
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fmt.Fprintf(b, "const numBuiltInPostNames = %d\n\n", len(names))
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fmt.Fprintf(b, "const builtInPostNamesData = \"\" +\n")
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for s := data; ; {
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if len(s) <= 64 {
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fmt.Fprintf(b, "%q\n", s)
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break
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}
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fmt.Fprintf(b, "%q +\n", s[:64])
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s = s[64:]
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}
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fmt.Fprintf(b, "\n")
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fmt.Fprintf(b, "var builtInPostNamesOffsets = [...]uint16{\n")
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for i, o := range offsets {
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fmt.Fprintf(b, "%#04x,", o)
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if i%8 == 7 {
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fmt.Fprintf(b, "\n")
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}
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}
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fmt.Fprintf(b, "\n}\n")
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dstUnformatted := b.Bytes()
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dst, err := format.Source(dstUnformatted)
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if err != nil {
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log.Fatalf("format.Source: %v\n\n----\n%s\n----", err, dstUnformatted)
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}
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if err := ioutil.WriteFile("data.go", dst, 0666); err != nil {
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log.Fatalf("ioutil.WriteFile: %v", err)
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}
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}
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// names is the built-in post table names listed at
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// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6post.html
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var names = [258]string{
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".notdef",
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".null",
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"nonmarkingreturn",
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"space",
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"exclam",
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"quotedbl",
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"numbersign",
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"dollar",
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"percent",
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"ampersand",
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"quotesingle",
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"parenleft",
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"parenright",
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"asterisk",
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"plus",
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"comma",
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"hyphen",
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"period",
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"slash",
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"zero",
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"one",
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"two",
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"three",
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"four",
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"five",
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"six",
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"seven",
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"eight",
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"nine",
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"colon",
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"semicolon",
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"less",
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"equal",
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"greater",
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"question",
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"at",
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"A",
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"B",
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"C",
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"D",
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"E",
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"F",
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"G",
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"H",
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"I",
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"J",
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"K",
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"L",
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"M",
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"N",
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"O",
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"P",
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"Q",
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"R",
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"S",
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"T",
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"U",
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"V",
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"W",
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"X",
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"Y",
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"Z",
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"bracketleft",
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"backslash",
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"bracketright",
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"asciicircum",
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"underscore",
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"grave",
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"a",
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"b",
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"c",
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"d",
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"e",
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"f",
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"g",
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"h",
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"i",
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"j",
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"k",
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"l",
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"m",
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"n",
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"o",
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"p",
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"q",
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"r",
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"s",
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"t",
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"u",
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"v",
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"w",
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"x",
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"y",
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"z",
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"braceleft",
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"bar",
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"braceright",
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"asciitilde",
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"Adieresis",
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"Aring",
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"Ccedilla",
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"Eacute",
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"Ntilde",
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"Odieresis",
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"Udieresis",
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"aacute",
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"agrave",
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"acircumflex",
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"adieresis",
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"atilde",
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"aring",
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"ccedilla",
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"eacute",
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"egrave",
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"ecircumflex",
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"edieresis",
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"iacute",
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"igrave",
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"icircumflex",
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"idieresis",
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"ntilde",
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"oacute",
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"ograve",
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"ocircumflex",
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"odieresis",
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"otilde",
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"uacute",
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"ugrave",
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"ucircumflex",
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"udieresis",
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"dagger",
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"degree",
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"cent",
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"sterling",
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"section",
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"bullet",
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"paragraph",
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"germandbls",
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"registered",
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"copyright",
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"trademark",
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"acute",
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"dieresis",
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"notequal",
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"AE",
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"Oslash",
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"infinity",
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"plusminus",
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"lessequal",
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"greaterequal",
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"yen",
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"mu",
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"partialdiff",
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"summation",
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"product",
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"pi",
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"integral",
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"ordfeminine",
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"ordmasculine",
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"Omega",
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"ae",
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"oslash",
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"questiondown",
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"exclamdown",
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"logicalnot",
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"radical",
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"florin",
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"approxequal",
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"Delta",
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"guillemotleft",
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"guillemotright",
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"ellipsis",
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"nonbreakingspace",
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"Agrave",
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"Atilde",
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"Otilde",
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"OE",
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"oe",
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"endash",
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"emdash",
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"quotedblleft",
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"quotedblright",
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"quoteleft",
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"quoteright",
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"divide",
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"lozenge",
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"ydieresis",
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"Ydieresis",
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"fraction",
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"currency",
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"guilsinglleft",
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"guilsinglright",
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"fi",
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"fl",
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"daggerdbl",
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"periodcentered",
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"quotesinglbase",
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"quotedblbase",
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"perthousand",
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"Acircumflex",
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"Ecircumflex",
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"Aacute",
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"Edieresis",
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"Egrave",
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"Iacute",
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"Icircumflex",
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"Idieresis",
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"Igrave",
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"Oacute",
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"Ocircumflex",
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"apple",
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"Ograve",
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"Uacute",
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"Ucircumflex",
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"Ugrave",
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"dotlessi",
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"circumflex",
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"tilde",
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"macron",
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"breve",
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"dotaccent",
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"ring",
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"cedilla",
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"hungarumlaut",
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"ogonek",
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"caron",
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"Lslash",
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"lslash",
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"Scaron",
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"scaron",
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"Zcaron",
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"zcaron",
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"brokenbar",
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"Eth",
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"eth",
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"Yacute",
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"yacute",
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"Thorn",
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"thorn",
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"minus",
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"multiply",
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"onesuperior",
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"twosuperior",
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"threesuperior",
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"onehalf",
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"onequarter",
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"threequarters",
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"franc",
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"Gbreve",
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"gbreve",
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"Idotaccent",
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"Scedilla",
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"scedilla",
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"Cacute",
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"cacute",
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"Ccaron",
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"ccaron",
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"dcroat",
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}
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@ -2,6 +2,8 @@
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// Use of this source code is governed by a BSD-style
|
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// license that can be found in the LICENSE file.
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//go:generate go run gen.go
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// Package sfnt implements a decoder for SFNT font file formats, including
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// TrueType and OpenType.
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package sfnt // import "golang.org/x/image/font/sfnt"
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@ -65,6 +67,7 @@ var (
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errInvalidLocationData = errors.New("sfnt: invalid location data")
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errInvalidMaxpTable = errors.New("sfnt: invalid maxp table")
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errInvalidNameTable = errors.New("sfnt: invalid name table")
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errInvalidPostTable = errors.New("sfnt: invalid post table")
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errInvalidSourceData = errors.New("sfnt: invalid source data")
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errInvalidTableOffset = errors.New("sfnt: invalid table offset")
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errInvalidTableTagOrder = errors.New("sfnt: invalid table tag order")
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@ -80,6 +83,7 @@ var (
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errUnsupportedNumberOfHints = errors.New("sfnt: unsupported number of hints")
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errUnsupportedNumberOfTables = errors.New("sfnt: unsupported number of tables")
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errUnsupportedPlatformEncoding = errors.New("sfnt: unsupported platform encoding")
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errUnsupportedPostTable = errors.New("sfnt: unsupported post table")
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errUnsupportedTableOffsetLength = errors.New("sfnt: unsupported table offset or length")
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errUnsupportedType2Charstring = errors.New("sfnt: unsupported Type 2 Charstring")
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)
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@ -217,6 +221,20 @@ func (s *source) u16(buf []byte, t table, i int) (uint16, error) {
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return u16(buf), nil
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}
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// u32 returns the uint32 in the table t at the relative offset i.
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//
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// buf is an optional scratch buffer as per the source.view method.
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func (s *source) u32(buf []byte, t table, i int) (uint32, error) {
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if i < 0 || uint(t.length) < uint(i+4) {
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return 0, errInvalidBounds
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}
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buf, err := s.view(buf, int(t.offset)+i, 4)
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if err != nil {
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return 0, err
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}
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return u32(buf), nil
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}
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// table is a section of the font data.
|
||||
type table struct {
|
||||
offset, length uint32
|
||||
|
|
@ -298,6 +316,7 @@ type Font struct {
|
|||
glyphIndex func(f *Font, b *Buffer, r rune) (GlyphIndex, error)
|
||||
indexToLocFormat bool // false means short, true means long.
|
||||
isPostScript bool
|
||||
postTableVersion uint32
|
||||
unitsPerEm Units
|
||||
|
||||
// The glyph data for the glyph index i is in
|
||||
|
|
@ -320,6 +339,13 @@ func (f *Font) initialize() error {
|
|||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// The order of these parseXxx calls matters. Later calls may depend on
|
||||
// f.cached state set up by earlier calls, such as the number of glyphs in
|
||||
// the font being parsed by parseMaxp.
|
||||
|
||||
// TODO: make state dependencies explicit instead of implicit.
|
||||
|
||||
buf, err = f.parseHead(buf)
|
||||
if err != nil {
|
||||
return err
|
||||
|
|
@ -332,6 +358,10 @@ func (f *Font) initialize() error {
|
|||
if err != nil {
|
||||
return err
|
||||
}
|
||||
buf, err = f.parsePost(buf)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
|
|
@ -538,6 +568,31 @@ func (f *Font) parseMaxp(buf []byte) ([]byte, error) {
|
|||
return buf, nil
|
||||
}
|
||||
|
||||
func (f *Font) parsePost(buf []byte) ([]byte, error) {
|
||||
// https://www.microsoft.com/typography/otspec/post.htm
|
||||
|
||||
const headerSize = 32
|
||||
if f.post.length < headerSize {
|
||||
return nil, errInvalidPostTable
|
||||
}
|
||||
u, err := f.src.u32(buf, f.post, 0)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
switch u {
|
||||
case 0x20000:
|
||||
if f.post.length < headerSize+2+2*uint32(f.NumGlyphs()) {
|
||||
return nil, errInvalidPostTable
|
||||
}
|
||||
case 0x30000:
|
||||
// No-op.
|
||||
default:
|
||||
return nil, errUnsupportedPostTable
|
||||
}
|
||||
f.cached.postTableVersion = u
|
||||
return buf, nil
|
||||
}
|
||||
|
||||
// TODO: API for looking up glyph variants?? For example, some fonts may
|
||||
// provide both slashed and dotted zero glyphs ('0'), or regular and 'old
|
||||
// style' numerals, and users can direct software to choose a variant.
|
||||
|
|
@ -606,6 +661,78 @@ func (f *Font) LoadGlyph(b *Buffer, x GlyphIndex, opts *LoadGlyphOptions) ([]Seg
|
|||
return b.segments, nil
|
||||
}
|
||||
|
||||
// GlyphName returns the name of the x'th glyph.
|
||||
//
|
||||
// Not every font contains glyph names. If not present, GlyphName will return
|
||||
// ("", nil).
|
||||
//
|
||||
// If present, the glyph name, provided by the font, is assumed to follow the
|
||||
// Adobe Glyph List Specification:
|
||||
// https://github.com/adobe-type-tools/agl-specification/blob/master/README.md
|
||||
//
|
||||
// This is also known as the "Adobe Glyph Naming convention", the "Adobe
|
||||
// document [for] Unicode and Glyph Names" or "PostScript glyph names".
|
||||
//
|
||||
// It returns ErrNotFound if the glyph index is out of range.
|
||||
func (f *Font) GlyphName(b *Buffer, x GlyphIndex) (string, error) {
|
||||
if int(x) >= f.NumGlyphs() {
|
||||
return "", ErrNotFound
|
||||
}
|
||||
if f.cached.postTableVersion != 0x20000 {
|
||||
return "", nil
|
||||
}
|
||||
if b == nil {
|
||||
b = &Buffer{}
|
||||
}
|
||||
|
||||
// The wire format for a Version 2 post table is documented at:
|
||||
// https://www.microsoft.com/typography/otspec/post.htm
|
||||
const glyphNameIndexOffset = 34
|
||||
|
||||
buf, err := b.view(&f.src, int(f.post.offset)+glyphNameIndexOffset+2*int(x), 2)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
u := u16(buf)
|
||||
if u < numBuiltInPostNames {
|
||||
i := builtInPostNamesOffsets[u+0]
|
||||
j := builtInPostNamesOffsets[u+1]
|
||||
return builtInPostNamesData[i:j], nil
|
||||
}
|
||||
// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6post.html
|
||||
// says that "32768 through 65535 are reserved for future use".
|
||||
if u > 32767 {
|
||||
return "", errUnsupportedPostTable
|
||||
}
|
||||
u -= numBuiltInPostNames
|
||||
|
||||
// Iterate through the list of Pascal-formatted strings. A linear scan is
|
||||
// clearly O(u), which isn't great (as the obvious loop, calling
|
||||
// Font.GlyphName, to get all of the glyph names in a font has quadratic
|
||||
// complexity), but the wire format doesn't suggest a better alternative.
|
||||
|
||||
offset := glyphNameIndexOffset + 2*f.NumGlyphs()
|
||||
buf, err = b.view(&f.src, int(f.post.offset)+offset, int(f.post.length)-offset)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
for {
|
||||
if len(buf) == 0 {
|
||||
return "", errInvalidPostTable
|
||||
}
|
||||
n := 1 + int(buf[0])
|
||||
if len(buf) < n {
|
||||
return "", errInvalidPostTable
|
||||
}
|
||||
if u == 0 {
|
||||
return string(buf[1:n]), nil
|
||||
}
|
||||
buf = buf[n:]
|
||||
u--
|
||||
}
|
||||
}
|
||||
|
||||
// Name returns the name value keyed by the given NameID.
|
||||
//
|
||||
// It returns ErrNotFound if there is no value for that key.
|
||||
|
|
|
|||
|
|
@ -431,3 +431,77 @@ loop:
|
|||
t.Errorf("Name:\ngot %q\nwant %q", name, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGlyphName(t *testing.T) {
|
||||
f, err := Parse(goregular.TTF)
|
||||
if err != nil {
|
||||
t.Fatalf("Parse: %v", err)
|
||||
}
|
||||
|
||||
testCases := []struct {
|
||||
r rune
|
||||
want string
|
||||
}{
|
||||
{'\x00', "NULL"},
|
||||
{'!', "exclam"},
|
||||
{'A', "A"},
|
||||
{'{', "braceleft"},
|
||||
{'\u00c4', "Adieresis"}, // U+00C4 LATIN CAPITAL LETTER A WITH DIAERESIS
|
||||
{'\u2020', "dagger"}, // U+2020 DAGGER
|
||||
{'\u2660', "spade"}, // U+2660 BLACK SPADE SUIT
|
||||
{'\uf800', "gopher"}, // U+F800 <Private Use>
|
||||
{'\ufffe', ".notdef"}, // Not in the Go Regular font, so GlyphIndex returns (0, nil).
|
||||
}
|
||||
|
||||
var b Buffer
|
||||
for _, tc := range testCases {
|
||||
x, err := f.GlyphIndex(&b, tc.r)
|
||||
if err != nil {
|
||||
t.Errorf("r=%q: GlyphIndex: %v", tc.r, err)
|
||||
continue
|
||||
}
|
||||
got, err := f.GlyphName(&b, x)
|
||||
if err != nil {
|
||||
t.Errorf("r=%q: GlyphName: %v", tc.r, err)
|
||||
continue
|
||||
}
|
||||
if got != tc.want {
|
||||
t.Errorf("r=%q: got %q, want %q", tc.r, got, tc.want)
|
||||
continue
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestBuiltInPostNames(t *testing.T) {
|
||||
testCases := []struct {
|
||||
x GlyphIndex
|
||||
want string
|
||||
}{
|
||||
{0, ".notdef"},
|
||||
{1, ".null"},
|
||||
{2, "nonmarkingreturn"},
|
||||
{13, "asterisk"},
|
||||
{36, "A"},
|
||||
{93, "z"},
|
||||
{123, "ocircumflex"},
|
||||
{202, "Edieresis"},
|
||||
{255, "Ccaron"},
|
||||
{256, "ccaron"},
|
||||
{257, "dcroat"},
|
||||
{258, ""},
|
||||
{999, ""},
|
||||
{0xffff, ""},
|
||||
}
|
||||
|
||||
for _, tc := range testCases {
|
||||
if tc.x >= numBuiltInPostNames {
|
||||
continue
|
||||
}
|
||||
i := builtInPostNamesOffsets[tc.x+0]
|
||||
j := builtInPostNamesOffsets[tc.x+1]
|
||||
got := builtInPostNamesData[i:j]
|
||||
if got != tc.want {
|
||||
t.Errorf("x=%d: got %q, want %q", tc.x, got, tc.want)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user