Prefere unicode FontName

@@ -4,6 +4,7 @@
 
 - Fix text justify with multiple paragraphs
 - Apply Flutter 2.5 coding style
+- Prefere unicode FontName
 
 ## 3.5.0
 

@@ -22,6 +22,32 @@ import 'package:meta/meta.dart';
 
 import 'font_metrics.dart';
 
+enum TtfParserName {
+  copyright,
+  fontFamily,
+  fontSubfamily,
+  uniqueID,
+  fullName,
+  version,
+  postScriptName,
+  trademark,
+  manufacturer,
+  designer,
+  description,
+  manufacturerURL,
+  designerURL,
+  license,
+  licenseURL,
+  reserved,
+  preferredFamily,
+  preferredSubfamily,
+  compatibleFullName,
+  sampleText,
+  postScriptFindFontName,
+  wwsFamily,
+  wwsSubfamily,
+}
+
 @immutable
 class TtfGlyphInfo {
   const TtfGlyphInfo(this.index, this.data, this.compounds);
@@ -71,7 +97,6 @@ class TtfParser {
     assert(tableOffsets.containsKey(glyf_table),
         'Unable to find the `glyf` table. This file is not a supported TTF font');
 
-    _parseFontName();
     _parseCMap();
     _parseIndexes();
     _parseGlyphs();
@@ -89,7 +114,7 @@ class TtfParser {
   final UnmodifiableByteDataView bytes;
   final Map<String, int> tableOffsets = <String, int>{};
   final Map<String, int> tableSize = <String, int>{};
-  String? _fontName;
+
   final Map<int, int> charToGlyphIndexMap = <int, int>{};
   final List<int> glyphOffsets = <int>[];
   final Map<int, PdfFontMetrics> glyphInfoMap = <int, PdfFontMetrics>{};
@@ -115,42 +140,46 @@ class TtfParser {
 
   int get numGlyphs => bytes.getUint16(tableOffsets[maxp_table]! + 4);
 
-  String? get fontName => _fontName;
+  String get fontName =>
+      getNameID(TtfParserName.postScriptName) ?? hashCode.toString();
 
   bool get unicode => bytes.getUint32(0) == 0x10000;
 
   // https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
-  void _parseFontName() {
+  String? getNameID(TtfParserName fontNameID) {
     final basePosition = tableOffsets[name_table]!;
+    // final format = bytes.getUint16(basePosition);
     final count = bytes.getUint16(basePosition + 2);
     final stringOffset = bytes.getUint16(basePosition + 4);
     var pos = basePosition + 6;
+    String? _fontName;
+
     for (var i = 0; i < count; i++) {
       final platformID = bytes.getUint16(pos);
       final nameID = bytes.getUint16(pos + 6);
       final length = bytes.getUint16(pos + 8);
       final offset = bytes.getUint16(pos + 10);
       pos += 12;
-      if (platformID == 1 && nameID == 6) {
+
+      if (platformID == 1 && nameID == fontNameID.index) {
         try {
           _fontName = utf8.decode(bytes.buffer
               .asUint8List(basePosition + stringOffset + offset, length));
-          return;
         } catch (a) {
           print('Error: $platformID $nameID $a');
         }
       }
-      if (platformID == 3 && nameID == 6) {
+
+      if (platformID == 3 && nameID == fontNameID.index) {
         try {
-          _fontName = _decodeUtf16(bytes.buffer
+          return _decodeUtf16(bytes.buffer
               .asUint8List(basePosition + stringOffset + offset, length));
-          return;
         } catch (a) {
           print('Error: $platformID $nameID $a');
         }
       }
     }
-    _fontName = hashCode.toString();
+    return _fontName;
   }
 
   void _parseCMap() {

@@ -55,7 +55,7 @@ class PdfTtfFont extends PdfFont {
   final TtfParser font;
 
   @override
-  String get fontName => font.fontName!;
+  String get fontName => font.fontName;
 
   @override
   double get ascent => font.ascent.toDouble() / font.unitsPerEm;

@@ -82,7 +82,7 @@ class Font {
     Type1Fonts.zapfDingbats: 'ZapfDingbats'
   };
 
-  String? get fontName => _type1Map[font];
+  String get fontName => _type1Map[font]!;
 
   @protected
   PdfFont buildFont(PdfDocument pdfDocument) {
@@ -153,7 +153,7 @@ class TtfFont extends Font {
   }
 
   @override
-  String? get fontName {
+  String get fontName {
     if (_pdfFont != null) {
       return _pdfFont!.fontName;
     }
@@ -162,6 +162,18 @@ class TtfFont extends Font {
     return font.fontName;
   }
 
+  String? fontNameID(TtfParserName nameID) {
+    final pdfFont = _pdfFont;
+    if (pdfFont != null) {
+      if (pdfFont is PdfTtfFont) {
+        return pdfFont.font.getNameID(nameID);
+      }
+    }
+
+    final font = TtfParser(data);
+    return font.getNameID(nameID);
+  }
+
   @override
   String toString() {
     final font = TtfParser(data);

@@ -58,7 +58,7 @@ void main() {
       build: (Context context) => ListView(
         children: <Widget>[
           Text(
-            style.font!.fontName!,
+            style.font!.fontName,
             style: style,
           ),
         ],