Changes to get creator working better.

- textencoding.RuneToGlyph always returns a value
- Encode empty /Difference correctly
- NewParagraph sets a custom encoding that matches its text

pdf/creator/paragraph.go

@@ -66,8 +66,15 @@ type Paragraph struct {
 func NewParagraph(text string) *Paragraph {
 	p := &Paragraph{}
 	p.text = text
-	p.textFont, _ = model.NewStandard14Font("Helvetica")
-	p.SetEncoder(textencoding.NewWinAnsiTextEncoder())
+
+	font, encoder, err := model.NewStandard14FontWithEncoding("Helvetica", model.GetAlphabet(text))
+	if err != nil {
+		common.Log.Debug("ERROR: NewStandard14FontWithEncoding failed err=%v. Falling back.", err)
+		p.textFont = model.DefaultFont()
+	}
+	p.textFont = font
+	p.SetEncoder(encoder)
+
 	p.fontSize = 10
 	p.lineHeight = 1.0
 
@@ -206,7 +213,7 @@ func (p *Paragraph) getTextWidth() float64 {
 
 		metrics, found := p.textFont.GetGlyphCharMetrics(glyph)
 		if !found {
-			common.Log.Debug("Glyph char metrics not found! %q (rune 0x04x=%c)", glyph, r, r)
+			common.Log.Debug("ERROR: Glyph char metrics not found! %q (rune 0x%04x=%c)", glyph, r, r)
 			return -1 // XXX/FIXME: return error.
 		}
 		w += p.fontSize * metrics.Wx

pdf/model/font.go

@@ -107,7 +107,7 @@ func NewStandard14FontWithEncoding(basefont string, alphabet map[rune]int) (*Pdf
 	}
 	slots = append(slots, slots1...)
 
-	// glyphs are the font glyphs that we need to encode
+	// `glyphs` are the font glyphs that we need to encode.
 	glyphs := []string{}
 	for _, r := range sortedAlphabet(alphabet) {
 		glyph, ok := textencoding.RuneToGlyph(r)
@@ -116,7 +116,7 @@ func NewStandard14FontWithEncoding(basefont string, alphabet map[rune]int) (*Pdf
 			continue
 		}
 		if _, ok = std.fontMetrics[glyph]; !ok {
-			common.Log.Debug("Glyph %q not in font", glyph)
+			common.Log.Trace("Glyph %q (0x%04x=%c)not in font", glyph, r, r)
 			continue
 		}
 		if len(glyphs) >= 255 {

pdf/model/textencoding/glyphs_glyphlist.go

@@ -10,6 +10,7 @@
 package textencoding
 
 import (
+	"fmt"
 	"regexp"
 	"strconv"
 	"strings"
@@ -66,9 +67,13 @@ func GlyphToRune(glyph string) (rune, bool) {
 }
 
 // RuneToGlyph is the reverse of the table lookups in GlyphToRune.
+// XXX:TODO Remove bool return as function always returns a value.
 func RuneToGlyph(r rune) (string, bool) {
 	glyph, ok := glyphlistRuneToGlyphMap[r]
-	return glyph, ok
+	if !ok {
+		glyph = fmt.Sprintf("uni%04x", r)
+	}
+	return glyph, true
 }
 
 // RuneToString converts rune `r` to a string. It unpacks `ligatures`.

pdf/model/textencoding/simple.go

@@ -170,7 +170,7 @@ func (se SimpleEncoder) GlyphToRune(glyph string) (rune, bool) {
 
 // ToPdfObject returns `se` as a PdfObject
 func (se SimpleEncoder) ToPdfObject() core.PdfObject {
-	if se.differences == nil {
+	if se.differences == nil || len(se.differences) == 0 {
 		return core.MakeName(se.baseName)
 	}
 	dict := core.MakeDict()