font/sfnt: implement implicit vstem before hintmask.
Change-Id: I811bcf94b518dabcfbebd085ad3c6a47c17ef38e Reviewed-on: https://go-review.googlesource.com/38288 Reviewed-by: David Crawshaw <crawshaw@golang.org>
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Nigel Tao
parent
ecc1a9abb6
commit
59d151bf14
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@ -762,7 +762,8 @@ var psOperators = [...][2][]psOperator{
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const escapeByte = 12
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// t2CReadWidth reads the optional width adjustment. If present, it is on the
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// bottom of the stack.
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// bottom of the arg stack. nArgs is the expected number of arguments on the
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// stack. A negative nArgs means a multiple of 2.
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//
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// 5177.Type2.pdf page 16 Note 4 says: "The first stack-clearing operator,
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// which must be one of hstem, hstemhm, vstem, vstemhm, cntrmask, hintmask,
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@ -773,19 +774,12 @@ func t2CReadWidth(p *psInterpreter, nArgs int32) {
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return
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}
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p.type2Charstrings.seenWidth = true
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switch nArgs {
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case 0:
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if p.argStack.top != 1 {
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return
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}
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case 1:
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if p.argStack.top <= 1 {
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return
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}
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default:
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if p.argStack.top%nArgs != 1 {
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if nArgs >= 0 {
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if p.argStack.top != nArgs+1 {
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return
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}
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} else if p.argStack.top&1 == 0 {
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return
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}
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// When parsing a standalone CFF, we'd save the value of p.argStack.a[0]
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// here as it defines the glyph's width (horizontal advance). Specifically,
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@ -803,7 +797,7 @@ func t2CReadWidth(p *psInterpreter, nArgs int32) {
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}
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func t2CStem(p *psInterpreter) error {
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t2CReadWidth(p, 2)
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t2CReadWidth(p, -1)
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if p.argStack.top%2 != 0 {
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return errInvalidCFFTable
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}
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@ -818,8 +812,27 @@ func t2CStem(p *psInterpreter) error {
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}
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func t2CMask(p *psInterpreter) error {
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// 5176.CFF.pdf section 4.3 "Hint Operators" says that "If hstem and vstem
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// hints are both declared at the beginning of a charstring, and this
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// sequence is followed directly by the hintmask or cntrmask operators, the
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// vstem hint operator need not be included."
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//
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// What we implement here is more permissive (but the same as what the
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// FreeType implementation does, and simpler than tracking the previous
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// operator and other hinting state): if a hintmask is given any arguments
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// (i.e. the argStack is non-empty), we run an implicit vstem operator.
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//
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// Note that the vstem operator consumes from p.argStack, but the hintmask
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// or cntrmask operators consume from p.instructions.
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if p.argStack.top != 0 {
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if err := t2CStem(p); err != nil {
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return err
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}
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} else if !p.type2Charstrings.seenWidth {
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p.type2Charstrings.seenWidth = true
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}
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hintBytes := (p.type2Charstrings.hintBits + 7) / 8
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t2CReadWidth(p, hintBytes)
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if len(p.instructions) < int(hintBytes) {
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return errInvalidCFFTable
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}
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@ -80,7 +80,7 @@ var (
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)
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func TestProprietaryAdobeSourceCodeProOTF(t *testing.T) {
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testProprietary(t, "adobe", "SourceCodePro-Regular.otf", 1500, 34)
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testProprietary(t, "adobe", "SourceCodePro-Regular.otf", 1500, -1)
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}
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func TestProprietaryAdobeSourceCodeProTTF(t *testing.T) {
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@ -92,7 +92,7 @@ func TestProprietaryAdobeSourceHanSansSC(t *testing.T) {
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}
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func TestProprietaryAdobeSourceSansProOTF(t *testing.T) {
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testProprietary(t, "adobe", "SourceSansPro-Regular.otf", 1800, 34)
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testProprietary(t, "adobe", "SourceSansPro-Regular.otf", 1800, -1)
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}
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func TestProprietaryAdobeSourceSansProTTF(t *testing.T) {
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@ -112,11 +112,11 @@ func TestProprietaryAppleGeezaPro1(t *testing.T) {
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}
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func TestProprietaryAppleHiragino0(t *testing.T) {
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testProprietary(t, "apple", "ヒラギノ角ゴシック W0.ttc?0", 9000, 6)
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testProprietary(t, "apple", "ヒラギノ角ゴシック W0.ttc?0", 9000, -1)
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}
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func TestProprietaryAppleHiragino1(t *testing.T) {
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testProprietary(t, "apple", "ヒラギノ角ゴシック W0.ttc?1", 9000, 6)
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testProprietary(t, "apple", "ヒラギノ角ゴシック W0.ttc?1", 9000, -1)
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}
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func TestProprietaryMicrosoftArial(t *testing.T) {
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@ -442,13 +442,14 @@ var proprietaryGlyphIndexTestCases = map[string]map[rune]GlyphIndex{
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// proprietaryGlyphTestCases hold a sample of each font's glyph vectors. The
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// numerical values can be verified by running the ttx tool, remembering that:
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// - for PostScript glyphs, ttx coordinates are relative, and hstem / vstem
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// operators are hinting-related and can be ignored.
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// - for PostScript glyphs, ttx coordinates are relative.
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// - for TrueType glyphs, ttx coordinates are absolute, and consecutive
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// off-curve points implies an on-curve point at the midpoint.
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var proprietaryGlyphTestCases = map[string]map[rune][]Segment{
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"adobe/SourceSansPro-Regular.otf": {
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',': {
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// -309 -1 115 hstem
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// 137 61 vstem
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// 67 -170 rmoveto
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moveTo(67, -170),
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// 81 34 50 67 86 vvcurveto
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@ -464,6 +465,8 @@ var proprietaryGlyphTestCases = map[string]map[rune][]Segment{
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},
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'Q': {
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// 106 -165 70 87 65 538 73 hstem
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// 52 86 388 87 vstem
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// 332 57 rmoveto
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moveTo(332, 57),
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// -117 -77 106 168 163 77 101 117 117 77 -101 -163 -168 -77 -106 -117 hvcurveto
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@ -492,6 +495,77 @@ var proprietaryGlyphTestCases = map[string]map[rune][]Segment{
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// endchar
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},
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'ĩ': { // U+0129 LATIN SMALL LETTER I WITH TILDE
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// 92 callgsubr # 92 + bias = 199.
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// : # Arg stack is [].
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// : -312 21 85 callgsubr # 85 + bias = 192.
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// : : # Arg stack is [-312 21].
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// : : -21 486 -20 return
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// : : # Arg stack is [-312 21 -21 486 -20].
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// : return
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// : # Arg stack is [-312 21 -21 486 -20].
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// 111 45 callsubr # 45 + bias = 152
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// : # Arg stack is [-312 21 -21 486 -20 111].
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// : 60 24 60 -9 216 callgsubr # 216 + bias = 323
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// : : # Arg stack is [-312 21 -21 486 -20 111 60 24 60 -9].
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// : : -20 24 -20 hstemhm
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// : : return
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// : : # Arg stack is [].
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// : return
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// : # Arg stack is [].
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// -50 55 77 82 77 55 hintmask 1101000100000000
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// 134 callsubr # 134 + bias = 241
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// : # Arg stack is [].
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// : 82 hmoveto
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moveTo(82, 0),
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// : 82 127 callsubr # 127 + bias = 234
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// : : # Arg stack is [82].
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// : : 486 -82 hlineto
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lineTo(164, 0),
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lineTo(164, 486),
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lineTo(82, 486),
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// : : return
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// : : # Arg stack is [].
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// : return
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// : # Arg stack is [].
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// hintmask 1110100110000000
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// 113 91 15 callgsubr # 15 + bias = 122
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// : # Arg stack is [113 91].
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// : rmoveto
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moveTo(195, 577),
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// : 69 29 58 77 3 hvcurveto
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cubeTo(264, 577, 293, 635, 296, 712),
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// : return
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// : # Arg stack is [].
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// hintmask 1110010110000000
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// -58 callsubr # -58 + bias = 49
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// : # Arg stack is [].
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// : -55 4 rlineto
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lineTo(241, 716),
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// : -46 -3 -14 -33 -29 -47 -26 84 -71 hhcurveto
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cubeTo(238, 670, 224, 637, 195, 637),
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cubeTo(148, 637, 122, 721, 51, 721),
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// : return
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// : # Arg stack is [].
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// hintmask 1101001100000000
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// -70 callgsubr # -70 + bias = 37
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// : # Arg stack is [].
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// : -69 -29 -58 -78 -3 hvcurveto
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cubeTo(-18, 721, -47, 663, -50, 585),
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// : 55 -3 rlineto
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lineTo(5, 582),
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// : 47 3 14 32 30 hhcurveto
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cubeTo(8, 629, 22, 661, 52, 661),
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// : return
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// : # Arg stack is [].
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// hintmask 1110100110000000
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// 51 callsubr # 51 + bias = 158
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// : # Arg stack is [].
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// : 46 26 -84 71 hhcurveto
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cubeTo(98, 661, 124, 577, 195, 577),
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// : endchar
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},
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'ī': { // U+012B LATIN SMALL LETTER I WITH MACRON
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// 92 callgsubr # 92 + bias = 199.
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// : # Arg stack is [].
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@ -587,6 +661,8 @@ var proprietaryGlyphTestCases = map[string]map[rune][]Segment{
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},
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'Λ': { // U+039B GREEK CAPITAL LETTER LAMDA
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// -43 21 -21 572 84 hstem
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// 0 515 vstem
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// 0 vmoveto
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moveTo(0, 0),
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// 85 hlineto
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@ -607,6 +683,77 @@ var proprietaryGlyphTestCases = map[string]map[rune][]Segment{
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lineTo(209, 656),
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// endchar
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},
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'Ḫ': { // U+1E2A LATIN CAPITAL LETTER H WITH BREVE BELOW
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// 94 -231 55 197 157 callgsubr # 157 + bias = 264
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// : # Arg stack is [94 -231 55 197].
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// : -21 309 72 return
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// : # Arg stack is [94 -231 55 197 -21 309 72].
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// 275 254 callgsubr # 254 + bias = 361
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// : # Arg stack is [94 -231 55 197 -21 309 72 275].
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// : -20 hstemhm
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// : 90 83 return
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// : # Arg stack is [90 83].
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// -4 352 callsubr # 352 + bias = 459
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// : # Arg stack is [90 83 -4].
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// : 51 210 51 return
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// : # Arg stack is [90 83 -4 51 210 51].
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// -3 84 hintmask 11111001
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// 90 -40 callsubr # -40 + bias = 67
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// : # Arg stack is [90].
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// : -27 callgsubr # -27 + bias = 80
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// : : # Arg stack is [90].
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// : : hmoveto
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moveTo(90, 0),
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// : : 83 309 305 -309 84 return
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// : : # Arg stack is [83 309 305 -309 84].
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// : -41 callgsubr # -41 + bias = 66
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// : : # Arg stack is [83 309 305 -309 84].
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// : : 656 -84 -275 -305 275 -83 return
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// : : # Arg stack is [83 309 305 -309 84 656 -84 -275 -305 275 -83].
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// : hlineto
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lineTo(173, 0),
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lineTo(173, 309),
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lineTo(478, 309),
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lineTo(478, 0),
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lineTo(562, 0),
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lineTo(562, 656),
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lineTo(478, 656),
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lineTo(478, 381),
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lineTo(173, 381),
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lineTo(173, 656),
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lineTo(90, 656),
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// : return
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// : # Arg stack is [].
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// hintmask 11110110
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// 235 -887 143 callsubr # 143 + bias = 250
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// : # Arg stack is [235 -887].
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// : rmoveto
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moveTo(325, -231),
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// : -84 callsubr # -84 + bias = 23
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// : : # Arg stack is [].
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// : : 107 44 77 74 5 hvcurveto
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cubeTo(432, -231, 476, -154, 481, -80),
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// : : -51 8 rlineto
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lineTo(430, -72),
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// : : -51 -8 -32 -53 -65 hhcurveto
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cubeTo(422, -123, 390, -176, 325, -176),
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// : : -65 -32 53 51 -8 hvcurveto
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cubeTo(260, -176, 228, -123, 220, -72),
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// : : -51 -22 callsubr # -22 + bias = 85
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// : : : # Arg stack is [-51].
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// : : : -8 rlineto
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lineTo(169, -80),
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// : : : -74 5 44 -77 107 hhcurveto
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cubeTo(174, -154, 218, -231, 325, -231),
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// : : : return
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// : : : # Arg stack is [].
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// : : return
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// : : # Arg stack is [].
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// : return
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// : # Arg stack is [].
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// endchar
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},
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},
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"microsoft/Arial.ttf": {
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