freetype/truetype: parse UCS-4 encoded cmap tables.
R=bsiegert CC=golang-dev https://codereview.appspot.com/14548046
This commit is contained in:
Nigel Tao
parent
ba07cbfbc8
commit
0a778f7f02
2 changed files with 182 additions and 53 deletions
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@ -87,7 +87,7 @@ const (
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// A cm holds a parsed cmap entry.
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type cm struct {
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start, end, delta, offset uint16
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start, end, delta, offset uint32
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}
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// A Font represents a Truetype font.
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@ -111,12 +111,14 @@ type Font struct {
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func (f *Font) parseCmap() error {
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const (
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cmapFormat4 = 4
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cmapFormat12 = 12
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languageIndependent = 0
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// A 32-bit encoding consists of a most-significant 16-bit Platform ID and a
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// least-significant 16-bit Platform Specific ID.
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unicodeEncoding = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0)
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microsoftEncoding = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
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unicodeEncoding = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0)
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microsoftUCS2Encoding = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
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microsoftUCS4Encoding = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4)
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)
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if len(f.cmap) < 4 {
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@ -137,7 +139,7 @@ func (f *Font) parseCmap() error {
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if pidPsid == unicodeEncoding {
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offset, found = int(o), true
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break
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} else if pidPsid == microsoftEncoding {
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} else if pidPsid == microsoftUCS2Encoding || pidPsid == microsoftUCS4Encoding {
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offset, found = int(o), true
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// We don't break out of the for loop, so that Unicode can override Microsoft.
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}
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@ -150,39 +152,63 @@ func (f *Font) parseCmap() error {
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}
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cmapFormat := u16(f.cmap, offset)
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if cmapFormat != cmapFormat4 {
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return UnsupportedError(fmt.Sprintf("cmap format: %d", cmapFormat))
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}
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language := u16(f.cmap, offset+4)
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if language != languageIndependent {
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return UnsupportedError(fmt.Sprintf("language: %d", language))
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}
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segCountX2 := int(u16(f.cmap, offset+6))
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if segCountX2%2 == 1 {
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return FormatError(fmt.Sprintf("bad segCountX2: %d", segCountX2))
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}
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segCount := segCountX2 / 2
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offset += 14
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f.cm = make([]cm, segCount)
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for i := 0; i < segCount; i++ {
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f.cm[i].end = u16(f.cmap, offset)
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switch cmapFormat {
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case cmapFormat4:
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language := u16(f.cmap, offset+4)
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if language != languageIndependent {
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return UnsupportedError(fmt.Sprintf("language: %d", language))
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}
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segCountX2 := int(u16(f.cmap, offset+6))
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if segCountX2%2 == 1 {
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return FormatError(fmt.Sprintf("bad segCountX2: %d", segCountX2))
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}
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segCount := segCountX2 / 2
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offset += 14
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f.cm = make([]cm, segCount)
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for i := 0; i < segCount; i++ {
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f.cm[i].end = uint32(u16(f.cmap, offset))
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offset += 2
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}
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offset += 2
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for i := 0; i < segCount; i++ {
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f.cm[i].start = uint32(u16(f.cmap, offset))
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offset += 2
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}
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for i := 0; i < segCount; i++ {
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f.cm[i].delta = uint32(u16(f.cmap, offset))
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offset += 2
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}
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for i := 0; i < segCount; i++ {
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f.cm[i].offset = uint32(u16(f.cmap, offset))
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offset += 2
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}
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f.cmapIndexes = f.cmap[offset:]
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return nil
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case cmapFormat12:
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if u16(f.cmap, offset+2) != 0 {
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return FormatError(fmt.Sprintf("cmap format: % x", f.cmap[offset:offset+4]))
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}
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length := u32(f.cmap, offset+4)
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language := u32(f.cmap, offset+8)
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if language != languageIndependent {
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return UnsupportedError(fmt.Sprintf("language: %d", language))
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}
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nGroups := u32(f.cmap, offset+12)
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if length != 12*nGroups+16 {
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return FormatError("inconsistent cmap length")
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}
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offset += 16
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f.cm = make([]cm, nGroups)
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for i := uint32(0); i < nGroups; i++ {
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f.cm[i].start = u32(f.cmap, offset+0)
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f.cm[i].end = u32(f.cmap, offset+4)
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f.cm[i].delta = u32(f.cmap, offset+8) - f.cm[i].start
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offset += 12
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}
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return nil
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}
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offset += 2
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for i := 0; i < segCount; i++ {
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f.cm[i].start = u16(f.cmap, offset)
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offset += 2
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}
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for i := 0; i < segCount; i++ {
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f.cm[i].delta = u16(f.cmap, offset)
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offset += 2
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}
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for i := 0; i < segCount; i++ {
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f.cm[i].offset = u16(f.cmap, offset)
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offset += 2
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}
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f.cmapIndexes = f.cmap[offset:]
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return nil
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return UnsupportedError(fmt.Sprintf("cmap format: %d", cmapFormat))
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}
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func (f *Font) parseHead() error {
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@ -296,8 +322,9 @@ func (f *Font) FUnitsPerEm() int32 {
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// Index returns a Font's index for the given rune.
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func (f *Font) Index(x rune) Index {
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c := uint16(x)
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c := uint32(x)
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n := len(f.cm)
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// TODO: binary search.
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for i := 0; i < n; i++ {
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if f.cm[i].start <= c && c <= f.cm[i].end {
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if f.cm[i].offset == 0 {
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@ -16,14 +16,24 @@ import (
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"testing"
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)
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func parseTestdataFont(name string) (font *Font, testdataIsOptional bool, err error) {
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b, err := ioutil.ReadFile(fmt.Sprintf("../../testdata/%s.ttf", name))
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if err != nil {
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// The "x-foo" fonts are optional tests, as they are not checked
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// in for copyright or file size reasons.
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return nil, strings.HasPrefix(name, "x-"), fmt.Errorf("%s: ReadFile: %v", name, err)
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}
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font, err = Parse(b)
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if err != nil {
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return nil, true, fmt.Errorf("%s: Parse: %v", name, err)
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}
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return font, false, nil
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}
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// TestParse tests that the luxisr.ttf metrics and glyphs are parsed correctly.
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// The numerical values can be manually verified by examining luxisr.ttx.
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func TestParse(t *testing.T) {
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b, err := ioutil.ReadFile("../../testdata/luxisr.ttf")
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if err != nil {
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t.Fatal(err)
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}
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font, err := Parse(b)
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font, _, err := parseTestdataFont("luxisr")
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if err != nil {
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t.Fatal(err)
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}
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@ -74,6 +84,105 @@ func TestParse(t *testing.T) {
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}
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}
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func TestIndex(t *testing.T) {
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testCases := map[string]map[rune]Index{
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"luxisr": {
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' ': 3,
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'!': 4,
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'A': 36,
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'V': 57,
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'É': 101,
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'fl': 193,
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'\u22c5': 385,
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'中': 0,
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},
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"x-arial-bold": {
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' ': 3,
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'+': 14,
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'0': 19,
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'_': 66,
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'w': 90,
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'~': 97,
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'Ä': 98,
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'fl': 192,
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'½': 242,
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'σ': 305,
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'λ': 540,
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'ỹ': 1275,
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'\u04e9': 1319,
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'中': 0,
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},
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"x-deja-vu-sans-oblique": {
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' ': 3,
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'*': 13,
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'Œ': 276,
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'ω': 861,
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'‡': 2571,
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'⊕': 3109,
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'fl': 4560,
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'\ufb03': 4561,
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'\ufffd': 4645,
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// TODO: '\U0001f640': ???,
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'中': 0,
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},
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"x-droid-sans-japanese": {
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' ': 0,
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'\u3000': 3,
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'\u3041': 25,
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'\u30fe': 201,
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'\uff61': 202,
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'\uff67': 208,
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'\uff9e': 263,
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'\uff9f': 264,
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'\u4e00': 265,
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'\u557e': 1000,
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'\u61b6': 2024,
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'\u6ede': 3177,
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'\u7505': 3555,
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'\u81e3': 4602,
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'\u81e5': 4603,
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'\u81e7': 4604,
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'\u81e8': 4605,
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'\u81ea': 4606,
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'\u81ed': 4607,
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'\u81f3': 4608,
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'\u81f4': 4609,
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'\u91c7': 5796,
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'\u9fa0': 6620,
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'\u203e': 12584,
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},
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"x-times-new-roman": {
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' ': 3,
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':': 29,
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'fl': 192,
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'Ŀ': 273,
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'♠': 388,
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'Ŗ': 451,
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'Σ': 520,
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'\u200D': 745,
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'Ẽ': 1216,
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'\u04e9': 1319,
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'中': 0,
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},
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}
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for name, wants := range testCases {
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font, testdataIsOptional, err := parseTestdataFont(name)
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if err != nil {
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if testdataIsOptional {
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t.Log(err)
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} else {
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t.Fatal(err)
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}
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continue
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}
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for r, want := range wants {
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if got := font.Index(r); got != want {
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t.Errorf("%s: Index(%q): got %d, want %d", name, r, got, want)
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}
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}
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}
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}
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var scalingTestCases = []struct {
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name string
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size int32
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@ -87,29 +196,22 @@ var scalingTestCases = []struct {
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// GlyphBuf.Load, and the unhinted values match C Freetype.
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{"x-arial-bold", 11, 0},
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//{"x-deja-vu-sans-oblique", 17, 0},
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//{"x-droid-sans-japanese", 9, 0},
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{"x-droid-sans-japanese", 9, 0},
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//{"x-times-new-roman", 13, 0},
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}
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func testScaling(t *testing.T, hinter *Hinter) {
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loop:
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for _, tc := range scalingTestCases {
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b, err := ioutil.ReadFile(fmt.Sprintf("../../testdata/%s.ttf", tc.name))
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font, testdataIsOptional, err := parseTestdataFont(tc.name)
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if err != nil {
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// The "x-foo" fonts are optional tests, as they are not checked
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// in for copyright or file size reasons.
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if strings.HasPrefix(tc.name, "x-") {
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t.Logf("%s: ReadFile: %v", tc.name, err)
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if testdataIsOptional {
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t.Log(err)
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} else {
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t.Errorf("%s: ReadFile: %v", tc.name, err)
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t.Error(err)
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}
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continue loop
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}
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font, err := Parse(b)
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if err != nil {
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t.Errorf("%s: Parse: %v", tc.name, err)
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continue loop
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}
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hinting := "sans"
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if hinter != nil {
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hinting = "with"
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