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fonts.go
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fonts.go
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package main
import (
"fmt"
"io"
)
type EmbeddedFont struct {
DocObj
TxtFont int
TxtSize float64
Page *Page
SimulateBold bool
SimulateItalic bool
}
func NewEmbeddedFont(doc *Document, page *Page, fontNum int, size float64) *EmbeddedFont {
return NewEmbeddedFontEx(doc, page, fontNum, size, false, false)
}
func NewEmbeddedFontEx(doc *Document, page *Page, fontNum int, size float64, ASimulateBold, ASimulateItalic bool) *EmbeddedFont {
return &EmbeddedFont{
TxtFont: fontNum,
TxtSize: size,
Page: page,
SimulateBold: ASimulateBold,
SimulateItalic: ASimulateItalic,
}
}
func (f *EmbeddedFont) PointSize() int {
return int(f.TxtSize)
// val, _ := strconv.ParseFloat(f.FTxtSize, 64)
// return int(math.Round(val))
}
func (f *EmbeddedFont) FontSize() float64 {
return f.TxtSize
// val, _ := strconv.ParseFloat(f.FTxtSize, 64)
// return val
}
// WriteString('/F'+IntToStr(FTxtFont)+' '+FTxtSize+' Tf'+CRLF, AStream);
func (f *EmbeddedFont) Encode(st PDFWriter) {
st.Writef("/F%d %f Tf%s", f.TxtFont, f.TxtSize, CRLF)
}
func (f *EmbeddedFont) WriteEmbeddedFont(doc *Document, src io.Reader, st PDFWriter) int {
st.Writef("%sstream%s", CRLF, CRLF)
PS := st.Offset()
if f.Document.hasOption(poCompressFonts) {
_ = compressStream(st, src)
} else {
//FIXME: handle errors
_, _ = io.Copy(st, src)
}
st.WriteString(CRLF)
st.WriteString("endstream")
return st.Offset() - PS
}
// func (TPDFEmbeddedFont) WriteEmbeddedSubsetFont(doc *TPDFDocument, AFontNum int, AOutStream io.Writer) int64 {
// if doc.Fonts[AFontNum].SubsetFont == nil {
// panic("WriteEmbeddedSubsetFont: SubsetFont stream was not initialised.")
// }
// fmt.Fprintf(AOutStream, "%sstream%s", CRLF, CRLF)
// PS := int64(AOutStream.(io.Seeker).Seek(0, io.SeekCurrent))
// if doc.Options.Contains(poCompressFonts) {
// CompressedStream := new(bytes.Buffer)
// CompressStream(doc.Fonts[AFontNum].SubsetFont, CompressedStream)
// CompressedStream.WriteTo(AOutStream)
// } else {
// io.Copy(AOutStream, doc.Fonts[AFontNum].SubsetFont)
// }
// return int64(AOutStream.(io.Seeker).Seek(0, io.SeekCurrent)) - PS
// }
type Font struct {
IsStdFont bool
Name string
FontFilename string
// FTrueTypeFile TTFFileInfo
TextMappingList TTextMappingList
SubsetFont io.Reader
}
func NewFont(name string, isStd bool) *Font { return &Font{Name: name, IsStdFont: isStd } }
func (f *Font) SetFontFilename(filename string) {
if f.FontFilename == filename {
return
}
f.FontFilename = filename
f.PrepareTextMapping()
}
func (f *Font) PrepareTextMapping() {
if f.FontFilename != "" {
f.TextMappingList = TTextMappingList{}
// f.FTrueTypeFile = &TTFFileInfo{}
// f.FTrueTypeFile.LoadFromFile(f.FFontFilename)
// f.FTrueTypeFile.PrepareFontDefinition("cp1252", true)
}
}
// func (f *TPDFFont) GenerateSubsetFont() {
// if f.FSubsetFont != nil {
// f.FSubsetFont = nil
// }
// fontSubsetter := &TFontSubsetter{
// TrueTypeFile: f.FTrueTypeFile,
// TextMappingList: f.FTextMappingList,
// }
// defer fontSubsetter.Free()
// f.FSubsetFont = &bytes.Buffer{}
// fontSubsetter.SaveToStream(f.FSubsetFont)
// fs, _ := os.Create(f.FTrueTypeFile.PostScriptName + "-subset.ttf")
// f.FSubsetFont.WriteTo(fs)
// fs.Close()
// }
func (f *Font) GetGlyphIndices(txt string) string {
result := ""
if len(txt) == 0 {
return result
}
for _, char := range txt {
c := uint16(char)
matched := false
for _, mapping := range f.TextMappingList {
if mapping.CharID == c {
result += fmt.Sprintf("%04X", mapping.GlyphID)
c = 0
matched = true
break
}
}
if !matched {
result += fmt.Sprintf("%04X", c)
}
}
return result
}
func (f *Font) AddTextToMappingList(txt string) {
// for _, char := range txt {
// c := uint16(char)
// gid := f.FTrueTypeFile.GetGlyphIndex(c)
// f.FTextMappingList=append(f.FTextMappingList, )
// f.FTextMappingList.Add(c, gid)
// }
}
type TrueTypeCharWidths struct {
Document *Document
EmbeddedFontNum int
}
func (w *TrueTypeCharWidths) Encode(st PDFWriter) {
// var s string
// lst := w.Document.Fonts[w.EmbeddedFontNum].TextMapping
// lst.Sort()
// lFont := w.Document.Fonts[w.EmbeddedFontNum].FTrueTypeFile
// for _, item := range lst.Items {
// var lWidthIndex int
// if item.GlyphID < lFont.HHead.numberOfHMetrics {
// lWidthIndex = item.GlyphID
// } else {
// lWidthIndex = lFont.HHead.numberOfHMetrics - 1
// }
// s += fmt.Sprintf(" %d [%d]", item.GlyphID, TTTFFriendClass(lFont).ToNatural(lFont.Widths[lWidthIndex].AdvanceWidth))
// }
// st.Write([]byte(s))
}
func IsStandardFont(fontname string) bool {
switch fontname {
case "Courier", "Courier-Bold", "Courier-Oblique", "Courier-BoldOblique",
"Helvetica", "Helvetica-Bold", "Helvetica-Oblique", "Helvetica-BoldOblique",
"Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic",
"Symbol", "ZapfDingbats":
return true
}
return false
}