forked from signintech/gopdf
/
fontmaker.go
489 lines (417 loc) · 11.5 KB
/
fontmaker.go
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package core
import (
"bufio"
"bytes"
"compress/zlib"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
)
//ErrFontLicenseDoesNotAllowEmbedding Font license does not allow embedding
var ErrFontLicenseDoesNotAllowEmbedding = errors.New("Font license does not allow embedding")
//FontMaker font maker
type FontMaker struct {
results []string
}
//GetResults get result
func (f *FontMaker) GetResults() []string {
return f.results
}
//NewFontMaker new FontMaker
func NewFontMaker() *FontMaker {
return new(FontMaker)
}
func (f *FontMaker) MakeFont(fontpath string, mappath string, encode string, outfolderpath string) error {
encodingpath := mappath + "/" + encode + ".map"
//read font file
if _, err := os.Stat(fontpath); os.IsNotExist(err) {
return err
}
fileext := filepath.Ext(fontpath)
if strings.ToLower(fileext) != ".ttf" {
//now support only ttf :-P
return errors.New("support only ttf ")
}
fontmaps, err := f.LoadMap(encodingpath)
if err != nil {
return err
}
info, err := f.GetInfoFromTrueType(fontpath, fontmaps)
if err != nil {
return err
}
//zip
basename := filepath.Base(fontpath)
tmp := strings.Split(basename, ".")
basename = strings.Replace(tmp[0], " ", "_", -1)
gzfilename := basename + ".z"
var buff bytes.Buffer
gzipwriter := zlib.NewWriter(&buff)
fontbytes, err := ioutil.ReadFile(fontpath)
if err != nil {
return err
}
_, err = gzipwriter.Write(fontbytes)
if err != nil {
return err
}
gzipwriter.Close()
err = ioutil.WriteFile(outfolderpath+"/"+gzfilename, buff.Bytes(), 0644)
if err != nil {
return err
}
info.PushString("File", gzfilename)
f.results = append(f.results, fmt.Sprintf("Save Z file at %s.", outfolderpath+"/"+gzfilename))
//Definition File
_, err = f.MakeDefinitionFile(f.GoStructName(basename), mappath, outfolderpath+"/"+basename+".font.go", encode, fontmaps, info)
if err != nil {
return err
}
return nil
}
func (f *FontMaker) GoStructName(name string) string {
goname := strings.ToUpper(name[0:1]) + name[1:]
return goname
}
func (f *FontMaker) MakeDefinitionFile(gofontname string, mappath string, exportfile string, encode string, fontmaps []FontMap, info TtfInfo) (string, error) {
fonttype := "TrueType"
str := ""
str += "package fonts //change this\n"
str += "import (\n"
str += " \"github.com/signintech/gopdf\"\n"
str += ")\n"
str += "type " + gofontname + " struct {\n"
str += "\tfamily string\n"
str += "\tfonttype string\n"
str += "\tname string\n"
str += "\tdesc []gopdf.FontDescItem\n"
str += "\tup int\n"
str += "\tut int\n"
str += "\tcw gopdf.FontCw\n"
str += "\tenc string\n"
str += "\tdiff string\n"
str += "}\n"
str += "func (me * " + gofontname + ") Init(){\n"
widths, err := info.GetMapIntInt64("Widths")
if err != nil {
return "", err
}
tmpStr, err := f.MakeWidthArray(widths)
if err != nil {
return "", err
}
str += tmpStr
tmpInt64, err := info.GetInt64("UnderlinePosition")
if err != nil {
return "", err
}
str += fmt.Sprintf("\tme.up = %d\n", tmpInt64)
tmpInt64, err = info.GetInt64("UnderlineThickness")
if err != nil {
return "", err
}
str += fmt.Sprintf("\tme.ut = %d\n", tmpInt64)
str += "\tme.fonttype = \"" + fonttype + "\"\n"
tmpStr, err = info.GetString("FontName")
if err != nil {
return "", err
}
str += fmt.Sprintf("\tme.name = \"%s\"\n", tmpStr)
str += "\tme.enc = \"" + encode + "\"\n"
diff, err := f.MakeFontEncoding(mappath, fontmaps)
if err != nil {
return "", err
}
if diff != "" {
str += "\tme.diff = \"" + diff + "\"\n"
}
fd, err := f.MakeFontDescriptor(info)
if err != nil {
return "", err
}
str += fd
str += "}\n"
str += "func (me * " + gofontname + ")GetType() string{\n"
str += "\treturn me.fonttype\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetName() string{\n"
str += "\treturn me.name\n"
str += "} \n"
str += "func (me * " + gofontname + ")GetDesc() []gopdf.FontDescItem{\n"
str += "\treturn me.desc\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetUp() int{\n"
str += "\treturn me.up\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetUt() int{\n"
str += "\treturn me.ut\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetCw() gopdf.FontCw{\n"
str += "\treturn me.cw\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetEnc() string{\n"
str += "\treturn me.enc\n"
str += "}\n"
str += "func (me * " + gofontname + ")GetDiff() string {\n"
str += "\treturn me.diff\n"
str += "}\n"
str += "func (me * " + gofontname + ") GetOriginalsize() int{\n"
str += "\treturn 98764\n"
str += "}\n"
str += "func (me * " + gofontname + ") SetFamily(family string){\n"
str += "\tme.family = family\n"
str += "}\n"
str += "func (me * " + gofontname + ") GetFamily() string{\n"
str += "\treturn me.family\n"
str += "}\n"
err = ioutil.WriteFile(exportfile, []byte(str), 0666)
if err != nil {
return "", err
}
f.results = append(f.results, fmt.Sprintf("Save GO file at %s.", exportfile))
return str, nil
}
func (f *FontMaker) MakeFontDescriptor(info TtfInfo) (string, error) {
fd := ""
fd = "\tme.desc = make([]gopdf.FontDescItem,8)\n"
// Ascent
ascender, err := info.GetInt64("Ascender")
if err != nil {
return "", err
}
fd += fmt.Sprintf("\tme.desc[0] = gopdf.FontDescItem{ Key:\"Ascent\",Val : \"%d\" }\n", ascender)
// Descent
descender, err := info.GetInt64("Descender")
if err != nil {
return "", err
}
fd += fmt.Sprintf("\tme.desc[1] = gopdf.FontDescItem{ Key: \"Descent\", Val : \"%d\" }\n", descender)
// CapHeight
capHeight, err := info.GetInt64("CapHeight")
if err == nil {
fd += fmt.Sprintf("\tme.desc[2] = gopdf.FontDescItem{ Key:\"CapHeight\", Val : \"%d\" }\n", capHeight)
} else if err == ERROR_NO_KEY_FOUND {
fd += fmt.Sprintf("\tme.desc[2] = gopdf.FontDescItem{ Key:\"CapHeight\", Val : \"%d\" }\n", ascender)
} else {
return "", err
}
// Flags
flags := 0
isFixedPitch, err := info.GetBool("IsFixedPitch")
if err != nil {
return "", err
}
if isFixedPitch {
flags += 1 << 0
}
flags += 1 << 5
italicAngle, err := info.GetInt64("ItalicAngle")
if italicAngle != 0 {
flags += 1 << 6
}
fd += fmt.Sprintf("\tme.desc[3] = gopdf.FontDescItem{ Key: \"Flags\", Val : \"%d\" }\n", flags)
//fmt.Printf("\n----\n")
// FontBBox
fbb, err := info.GetInt64s("FontBBox")
if err != nil {
return "", err
}
fd += fmt.Sprintf("\tme.desc[4] = gopdf.FontDescItem{ Key:\"FontBBox\", Val : \"[%d %d %d %d]\" }\n", fbb[0], fbb[1], fbb[2], fbb[3])
// ItalicAngle
fd += fmt.Sprintf("\tme.desc[5] = gopdf.FontDescItem{ Key:\"ItalicAngle\", Val : \"%d\" }\n", italicAngle)
// StemV
stdVW, err := info.GetInt64("StdVW")
issetStdVW := false
if err == nil {
issetStdVW = true
} else if err == ERROR_NO_KEY_FOUND {
issetStdVW = false
} else {
return "", err
}
bold, err := info.GetBool("Bold")
if err != nil {
return "", err
}
stemv := int(0)
if issetStdVW {
stemv = stdVW
} else if bold {
stemv = 120
} else {
stemv = 70
}
fd += fmt.Sprintf("\tme.desc[6] = gopdf.FontDescItem{ Key:\"StemV\", Val : \"%d\" }\n ", stemv)
// MissingWidth
missingWidth, err := info.GetInt64("MissingWidth")
if err != nil {
return "", err
}
fd += fmt.Sprintf("\tme.desc[7] = gopdf.FontDescItem{ Key:\"MissingWidth\", Val : \"%d\" } \n ", missingWidth)
return fd, nil
}
func (f *FontMaker) MakeFontEncoding(mappath string, fontmaps []FontMap) (string, error) {
refpath := mappath + "/cp1252.map"
ref, err := f.LoadMap(refpath)
if err != nil {
return "", err
}
s := ""
last := 0
for c := 0; c <= 255; c++ {
if fontmaps[c].Name != ref[c].Name {
if c != last+1 {
s += fmt.Sprintf("%d ", c)
}
last = c
s += "/" + fontmaps[c].Name + " "
}
}
return strings.TrimSpace(s), nil
}
func (f *FontMaker) MakeWidthArray(widths map[int]int) (string, error) {
str := "\tme.cw = make(gopdf.FontCw)\n"
for c := 0; c <= 255; c++ {
str += "\tme.cw["
chr := string(c)
if chr == "\"" {
str += "gopdf.ToByte(\"\\\"\")"
} else if chr == "\\" {
str += "gopdf.ToByte(\"\\\\\")"
} else if c >= 32 && c <= 126 {
str += "gopdf.ToByte(\"" + chr + "\")"
} else {
str += fmt.Sprintf("gopdf.Chr(%d)", c)
}
str += fmt.Sprintf("]=%d\n", widths[c])
}
return str, nil
}
func (f *FontMaker) FileSize(path string) (int64, error) {
file, err := os.Open(path)
if err != nil {
return -1, err
}
defer file.Close()
// get the file size
stat, err := file.Stat()
if err != nil {
return -1, err
}
return stat.Size(), nil
}
func (f *FontMaker) GetInfoFromTrueType(fontpath string, fontmaps []FontMap) (TtfInfo, error) {
var parser TTFParser
err := parser.Parse(fontpath)
if err != nil {
return nil, err
}
if !parser.Embeddable {
return nil, ErrFontLicenseDoesNotAllowEmbedding
}
info := NewTtfInfo()
fileContent, err := ioutil.ReadFile(fontpath)
if err != nil {
return nil, err
}
info.PushBytes("Data", fileContent)
size, err := f.FileSize(fontpath)
if err != nil {
return nil, err
}
info.PushInt64("OriginalSize", size)
k := float64(1000.0 / float64(parser.unitsPerEm))
info.PushString("FontName", parser.postScriptName)
info.PushBool("Bold", parser.Bold)
info.PushInt("ItalicAngle", parser.italicAngle)
info.PushBool("IsFixedPitch", parser.isFixedPitch)
info.PushInt("Ascender", f.MultiplyAndRound(k, parser.typoAscender))
info.PushInt("Descender", f.MultiplyAndRound(k, parser.typoDescender))
info.PushInt("UnderlineThickness", f.MultiplyAndRound(k, parser.underlineThickness))
info.PushInt("UnderlinePosition", f.MultiplyAndRound(k, parser.underlinePosition))
fontBBoxs := []int{
f.MultiplyAndRound(k, parser.xMin),
f.MultiplyAndRound(k, parser.yMin),
f.MultiplyAndRound(k, parser.xMax),
f.MultiplyAndRound(k, parser.yMax),
}
info.PushInt64s("FontBBox", fontBBoxs)
info.PushInt("CapHeight", f.MultiplyAndRound(k, parser.capHeight))
missingWidth := f.MultiplyAndRoundWithUInt64(k, parser.widths[0])
info.PushInt("MissingWidth", missingWidth)
widths := make(map[int]int)
max := 256
c := 0
for c < max {
widths[c] = missingWidth
c++
}
c = 0 //reset
for c < max {
if fontmaps[c].Name != ".notdef" {
uv := fontmaps[c].Uv
if val, ok := parser.chars[int(uv)]; ok {
w := parser.widths[val]
widths[c] = f.MultiplyAndRoundWithUInt64(k, w)
} else {
f.results = append(f.results, fmt.Sprintf("Warning: Character %s (%d) is missing", fontmaps[c].Name, fontmaps[c].Uv))
}
}
c++
}
info.PushMapIntInt64("Widths", widths)
return info, nil
}
func (f *FontMaker) MultiplyAndRoundWithUInt64(k float64, v uint) int {
r := k * float64(v)
return f.Round(r)
}
func (f *FontMaker) MultiplyAndRound(k float64, v int) int {
r := k * float64(v)
return f.Round(r)
}
func (f *FontMaker) Round(value float64) int {
return Round(value)
}
func (f *FontMaker) LoadMap(encodingpath string) ([]FontMap, error) {
if _, err := os.Stat(encodingpath); os.IsNotExist(err) {
return nil, err
}
var fontmaps []FontMap
i := 0
max := 256
for i < max {
fontmaps = append(fontmaps, FontMap{Uv: -1, Name: ".notdef"})
i++
}
file, err := os.Open(encodingpath)
if err != nil {
return nil, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
e := strings.Split(line, " ")
strC := (e[0])[1:]
strUv := (e[1])[2:]
c, err := strconv.ParseInt(strC, 16, 0)
if err != nil {
return nil, err
}
uv, err := strconv.ParseInt(strUv, 16, 0)
if err != nil {
return nil, err
}
name := e[2]
//fmt.Println("strC = "+strC+"strUv = "+strUv+" c=%d , uv= %d", c, uv)
fontmaps[c].Name = name
fontmaps[c].Uv = int(uv)
}
return fontmaps, nil
}