Allow TrueType font files to not have PostScript entries in their "name" table.

pdf/model/font_composite.go

@@ -316,9 +316,14 @@ func (font pdfCIDFontType2) SetEncoder(encoder textencoding.TextEncoder) {
 
 // GetGlyphCharMetrics returns the character metrics for the specified glyph.  A bool flag is
 // returned to indicate whether or not the entry was found in the glyph to charcode mapping.
+// XXX:TODO(peterwilliams97): Cache enc creation and cache glyph:metrics in a map.
 func (font pdfCIDFontType2) GetGlyphCharMetrics(glyph string) (fonts.CharMetrics, bool) {
 	metrics := fonts.CharMetrics{}
 
+	if font.ttfParser == nil {
+		return metrics, false
+	}
+
 	enc := textencoding.NewTrueTypeFontEncoder(font.ttfParser.Chars)
 
 	// Convert the glyph to character code.

pdf/model/font_test.go

@@ -317,6 +317,16 @@ var charcodeBytesToUnicodeTest = []fontFragmentTest{
 			75, 76, 77},
 		" *ﺏﻁﻝﺍﺔﻴﻠﻜ،ﺕﺭﺘﻌﻤﺎﺠﻲﻨﻘﺩﻬ/ﻙﻭﻕﺃﻡﻋﻓﺴ٢٠٣ﻯﻥﺒﺸﺌﺱﻷ,ﺯﺤﺄﻀـﺓﺫ.)٤(٩ل٥٧٨ﻸﻰ%١ﺇ٦ﺡﻫﻱﻅﻐﺼﻑﺨﺀﻊLM",
 	},
+	fontFragmentTest{"Tesseract",
+		"./testdata/font/tesseract.txt", 3,
+		[]byte{0, 65, 0, 97,
+			1, 2, 1, 65, 1, 97,
+			12, 2, 12, 65, 12, 97,
+			20, 65, 20, 97, 20, 255,
+			42, 2, 42, 65, 42, 97,
+			65, 66, 67, 255},
+		"AaĂŁšంుౡᑁᑡᓿ⨂⩁⩡䅂䏿",
+	},
 }
 
 type fontFragmentTest struct {

pdf/model/fonts/ttfparser.go

@@ -566,6 +566,7 @@ func (t *ttfParser) parseCmapFormat12() error {
 	return nil
 }
 
+// ParseName parses the "name" table.
 func (t *ttfParser) ParseName() error {
 	if err := t.Seek("name"); err != nil {
 		return err
@@ -596,7 +597,7 @@ func (t *ttfParser) ParseName() error {
 		}
 	}
 	if t.rec.PostScriptName == "" {
-		return fmt.Errorf("the name PostScript was not found")
+		common.Log.Debug("ParseName: The name PostScript was not found.")
 	}
 	return nil
 }

pdf/model/textencoding/truetype.go

@@ -24,8 +24,8 @@ type TrueTypeFontEncoder struct {
 	cmap                CMap
 }
 
-// NewTrueTypeFontEncoder creates a new text encoder for TTF fonts with a pre-loaded
+// NewTrueTypeFontEncoder creates a new text encoder for TTF fonts with a runeToGlyphIndexMap that
-// runeToGlyphIndexMap, that has been pre-loaded from the font file.
+// has been preloaded from the font file.
 // The new instance is preloaded with a CMapIdentityH (Identity-H) CMap which maps 2-byte charcodes
 // to CIDs (glyph index).
 func NewTrueTypeFontEncoder(runeToGlyphIndexMap map[uint16]uint16) TrueTypeFontEncoder {