今回はopen type fontのフォントファイルからフォント名／フォントファミリー名を取得します。
open typeのファイル仕様に沿ってファイルを読むのみです。
フォント名はプラットフォームや表示言語に応じて複数格納されています。
今回はWindowsのユニコード向け、英語圏用の名前を取得／利用しています。
/// <summary>
/// フォントの埋め込み
///
/// フォント名／フォントファミリー名を指定しない場合はフォントファイルから自動取得を試みる
/// </summary>
void WriteFont_EmbeddedUnicode(PDFRawWriter bw, ref int nObjIndex, string strFontObjName, string strFontFile, string strFont = "", string strFontFamily = "")
{
ushort nRangeMin = 0xFFFF;
ushort nRangeMax = 0;
//opentypeフォントファイルからcmapを読み込む
IDictionary<ushort, byte[]> cmap = LoadCMap(strFontFile, out nRangeMin, out nRangeMax, ref strFontFamily, ref strFont);
_cmapFonts.Add(strFontObjName, cmap);
_listnXref.Add(bw.BaseStream.Position);
{
bw.WriteLine("" + nObjIndex + " 0 obj");
bw.WriteLine("<</Type /Font");
bw.WriteLine("/BaseFont /" + strFont);
bw.WriteLine("/Subtype /Type0");
bw.WriteLine("/Encoding /Identity-H"); //PDF独自のエンコード
bw.WriteLine("/DescendantFonts [" + (nObjIndex + 1) + " 0 R]");
bw.WriteLine("/ToUnicode " + (nObjIndex + 4) + " 0 R"); //ToUnicode変換表
bw.WriteLine(">>");
bw.WriteLine("endobj");
}
nObjIndex++;
int nDescendantFontsObjIndex = nObjIndex;
_listnXref.Add(bw.BaseStream.Position);
{
bw.WriteLine("" + nObjIndex + " 0 obj");
bw.WriteLine("<</Type /Font");
bw.WriteLine("/Subtype /CIDFontType0");
bw.WriteLine("/BaseFont /" + strFont);
//bw.WriteLine("/CIDToGIDMap/Identity");
bw.WriteLine("/CIDSystemInfo <<");
bw.WriteLine("/Registry (Adobe)");
bw.WriteLine("/Ordering (Identity)"); //Japan1にはしない
bw.WriteLine("/Supplement 0"); //6にした方がいい？
bw.WriteLine(">>");
bw.WriteLine("/FontDescriptor " + (nObjIndex + 1) + " 0 R");
bw.WriteLine(">>");
bw.WriteLine("endobj");
}
nObjIndex++;
////CMAPの準備
////{
// string strFontCMapFile = @"cmap_msgothic.txt";
// //
// //CMAPの読み込み
// //
// //以下を実行してcmap.txtを取得、その中から「Char 30D6 -> Index 2121」というようなunicode用のcmapテーブルを抜き出してcmap_msgothic.txtに保存
// // ttfdump.exe HuiFont29.ttf -tcmap -nx >cmap.txt
/// <summary>
/// open type fontファイルからcmapを読み取る
///
/// open type fontの仕様通りにファイルを読むだけ
/// マジックナンバーなどでファイルチェックをするべきだがしていない
///
/// strFontFamilyName／strFontPostScriptName は==""だった場合のみ、フォントファイルから読み出す
///
/// 仕様
/// https://www.microsoft.com/typography/otspec/otff.htm
/// </summary>
IDictionary<ushort, byte[]> LoadCMap(string strFontFile, out ushort nRangeMin, out ushort nRangeMax, ref string strFontFamilyName, ref string strFontPostScriptName)//, out int nBBXMin, out int nBBXMax, out int nBBYMin, out int nBBYMax, out int nAscender, out int nDescender)
{
IDictionary<ushort, byte[]> cmap = new Dictionary<ushort, byte[]>();
nRangeMin = 0xFFFF;
nRangeMax = 0;
int nBBXMin = 0;
int nBBXMax = 0;
int nBBYMin = 0;
int nBBYMax = 0;
int nAscender = 0;
int nDescender = 0;
using (FileStream fs = new FileStream(strFontFile, FileMode.Open, FileAccess.Read))
using (BinaryReader br = new BinaryReader(fs))
{
// https://www.microsoft.com/typography/otspec/otff.htm
byte[] sfntVer = br.ReadBytes(4);
uint nTableCount = ByteToUInt_BE(br.ReadBytes(2));
uint nSearchRange = ByteToUInt_BE(br.ReadBytes(2));
uint nEntrySelector = ByteToUInt_BE(br.ReadBytes(2));
uint nRangeShift = ByteToUInt_BE(br.ReadBytes(2));
uint nCMapOffset = 0;
uint nCMapLength = 0;
uint nHeadOffset = 0;
uint nHeadLength = 0;
uint nHheaOffset = 0;
uint nHheaLength = 0;
uint nOS2Offset = 0;
uint nOS2Length = 0;
uint nNameOffset = 0;
uint nNameLength = 0;
for (uint i = 0; i < nTableCount; i++)
{
byte[] tag = br.ReadBytes(4);
uint checkSum = ByteToUInt_BE(br.ReadBytes(4));
uint offset = ByteToUInt_BE(br.ReadBytes(4)); // Offset from beginning of TrueType font file.
uint length = ByteToUInt_BE(br.ReadBytes(4));
string strTag = Encoding.ASCII.GetString(tag);
if (strTag == "cmap")
{
nCMapOffset = offset;
nCMapLength = length;
}
if (strTag == "head")
{
nHeadOffset = offset;
nHeadLength = length;
}
if (strTag == "hhea")
{
nHheaOffset = offset;
nHheaLength = length;
}
if (strTag == "OS/2")
{
nOS2Offset = offset;
nOS2Length = length;
}
if (strTag == "name")
{
nNameOffset = offset;
nNameLength = length;
}
}
if (strFontFamilyName == "" || strFontPostScriptName == "")
{
if (nNameOffset > 0 && nNameLength > 0)
{
fs.Seek(nNameOffset, SeekOrigin.Begin);
// https://www.microsoft.com/typography/otspec/name.htm
uint format = ByteToUInt_BE(br.ReadBytes(2));
uint count = ByteToUInt_BE(br.ReadBytes(2)); //Number of name records.
uint stringOffset = ByteToUInt_BE(br.ReadBytes(2)); //Offset to start of string storage (from start of table).
//プラットフォーム３、エンコーディング１（Windowsのunicode）で、さらにランゲージID1033（英語圏用の名前）のデータのみ収集
List<uint> list31NameID = new List<uint>();
List<uint> list31Length = new List<uint>();
List<uint> list31Offset = new List<uint>();
//Name Records
for (uint i = 0; i < count; i++)
{
uint platformID = ByteToUInt_BE(br.ReadBytes(2));
uint encodingID = ByteToUInt_BE(br.ReadBytes(2));
uint languageID = ByteToUInt_BE(br.ReadBytes(2));
uint nameID = ByteToUInt_BE(br.ReadBytes(2));
uint length = ByteToUInt_BE(br.ReadBytes(2)); //String length (in bytes).
uint offset = ByteToUInt_BE(br.ReadBytes(2)); //String offset from start of storage area (in bytes).
//プラットフォーム３、エンコーディング１（Windowsのunicode）で、さらにランゲージID1033（英語圏用の名前）のデータのみ収集
if (platformID != 3 || encodingID != 1 || languageID != 1033)
continue;
list31NameID.Add(nameID);
list31Length.Add(length);
list31Offset.Add(offset);
}
//format==1の場合のみ言語タグ情報がある
if (format == 1)
{
uint langTagCount = ByteToUInt_BE(br.ReadBytes(2));
//LangTagRecord
for (uint i = 0; i < langTagCount; i++)
{
uint length = ByteToUInt_BE(br.ReadBytes(2));
uint offset = ByteToUInt_BE(br.ReadBytes(2)); // Language-tag string offset from start of storage area (in bytes).
}
}
//Storage area開始
long nStorageStart = fs.Position;
for (int i = 0; i < list31NameID.Count; i++)
{
if (list31NameID[i] == 1) //font family name
{
if (strFontFamilyName == "")
{
fs.Seek(nStorageStart + list31Offset[i], SeekOrigin.Begin);
strFontFamilyName = Encoding.BigEndianUnicode.GetString(br.ReadBytes((int)list31Length[i]));
}
}
if (list31NameID[i] == 6) //Postscript name for the font
{
if (strFontPostScriptName == "")
{
fs.Seek(nStorageStart + list31Offset[i], SeekOrigin.Begin);
strFontPostScriptName = Encoding.BigEndianUnicode.GetString(br.ReadBytes((int)list31Length[i]));
}
}
}
}
}
if (nHheaOffset > 0 && nHheaLength > 0)
{
fs.Seek(nHheaOffset, SeekOrigin.Begin);
// https://www.microsoft.com/typography/otspec/hhea.htm
byte[] version = br.ReadBytes(4);
nAscender = ByteToInt_BE(br.ReadBytes(2));
nDescender = ByteToInt_BE(br.ReadBytes(2));
int LineGap = ByteToInt_BE(br.ReadBytes(2));
uint advanceWidthMax = ByteToUInt_BE(br.ReadBytes(2));
int minLeftSideBearing = ByteToInt_BE(br.ReadBytes(2));
int minRightSideBearing = ByteToInt_BE(br.ReadBytes(2));
int xMaxExtent = ByteToInt_BE(br.ReadBytes(2));
int caretSlopeRise = ByteToInt_BE(br.ReadBytes(2));
int caretSlopeRun = ByteToInt_BE(br.ReadBytes(2));
int caretOffset = ByteToInt_BE(br.ReadBytes(2));
int reserved1 = ByteToInt_BE(br.ReadBytes(2));
int reserved2 = ByteToInt_BE(br.ReadBytes(2));
int reserved3 = ByteToInt_BE(br.ReadBytes(2));
int reserved4 = ByteToInt_BE(br.ReadBytes(2));
int metricDataFormat = ByteToInt_BE(br.ReadBytes(2));
uint numberOfHMetrics = ByteToUInt_BE(br.ReadBytes(2));
}
/// <summary>
/// "小説家になろう"の縦書きPDF変換処理
/// </summary>
public bool ConvertPDFFile(string strFile, PDFTextReader srcPDF)
{
Close();
int nObjIndex = 1;
using (FileStream fs = new FileStream(strFile, FileMode.Create, FileAccess.Write))
using (PDFRawWriter bw = new PDFRawWriter(fs))
{
//ヘッダー出力
bw.WriteLine("%PDF-1.7");
//フォント出力
int nResourceIndex;
{
nResourceIndex = nObjIndex;
//フォント埋め込み
{
List<KeyValuePair<string, int>> listFonts = new List<KeyValuePair<string, int>>();
{
string strFontObjName = "F0";
listFonts.Add(new KeyValuePair<string, int>(strFontObjName, nObjIndex));
WriteFont_EmbeddedUnicode(bw, ref nObjIndex, strFontObjName, @"msgothic.otf");//, "MS-Gothic", "MS Gothic");
}
//フォント一覧のみのリソース
nResourceIndex = nObjIndex;
_listnXref.Add(bw.BaseStream.Position);
{
bw.WriteLine("" + nObjIndex + " 0 obj");
bw.WriteLine("<</Font");
bw.WriteLine("<<");
foreach (KeyValuePair<string, int> pair in listFonts)
{
bw.WriteLine("/" + pair.Key + " " + pair.Value + " 0 R");
}
bw.WriteLine(">>");
bw.WriteLine(">>");
bw.WriteLine("endobj");
}
nObjIndex++;
}
}
/// <summary>
/// PDF作成例
/// </summary>
public bool CreatePDFFile(string strFile)
{
Close();
int nObjIndex = 1;
using (FileStream fs = new FileStream(strFile, FileMode.Create, FileAccess.Write))
using (PDFRawWriter bw = new PDFRawWriter(fs))
{
//ヘッダー出力
bw.WriteLine("%PDF-1.7");
//フォント出力
int nResourceIndex;
{
nResourceIndex = nObjIndex;
//フォント埋め込み
{
List<KeyValuePair<string, int>> listFonts = new List<KeyValuePair<string, int>>();
{
string strFontObjName = "F0";
listFonts.Add(new KeyValuePair<string, int>(strFontObjName, nObjIndex));
WriteFont_EmbeddedUnicode(bw, ref nObjIndex, strFontObjName, @"msgothic.otf", "MS-Gothic", "MS Gothic");
}
{
string strFontObjName = "F1";
listFonts.Add(new KeyValuePair<string, int>(strFontObjName, nObjIndex));
WriteFont_Ascii(bw, ref nObjIndex, "Times-Italic", strFontObjName); //欧文フォント指定
}
{
string strFontObjName = "F2";
listFonts.Add(new KeyValuePair<string, int>(strFontObjName, nObjIndex));
WriteFont_UnicodeJapanese(bw, ref nObjIndex, "KozMinPr6N-Regular", strFontObjName); //日本語フォント指定（フォント埋め込みなし）
}
