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