public SimpleFont(Document context, string baseFont)
: base(context, baseFont)
{
// assign the glyph list based on the font
if ("ZapfDingbats".Equals(baseFont, StringComparison.Ordinal))
{
glyphList = GlyphMapping.ZapfDingbats;
}
else
{
glyphList = GlyphMapping.Default;
}
}
protected override void OnLoad()
{
base.OnLoad();
if (BaseDataObject.Resolve(PdfName.Encoding) is PdfDictionary encodingDictionary &&
encodingDictionary.Values.Count > 0 &&
encodingDictionary.Resolve(PdfName.Differences) is PdfArray differencesObject)
{
var fontMapping = (GlyphMapping)null;
if (BaseDataObject.Resolve(PdfName.BaseFont) is PdfName pdfName)
{
var name = Regex.Replace(pdfName.RawValue, @"[\/?:*""><|]+", "", RegexOptions.Compiled);
if (GlyphMapping.IsExist(name))
{
fontMapping = new GlyphMapping(name);
}
}
byte[] charCodeData = new byte[1];
foreach (PdfDirectObject differenceObject in differencesObject)
{
if (differenceObject is PdfInteger pdfInteger) // Subsequence initial code.
{
charCodeData[0] = (byte)(((int)pdfInteger.Value) & 0xFF);
}
else // Character name.
{
ByteArray charCode = new ByteArray(charCodeData);
string charName = (string)((PdfName)differenceObject).Value;
if (charName.Equals(".notdef", StringComparison.Ordinal))
{
codes.Remove(charCode);
}
else
{
int?code = GlyphMapping.DLFONT.NameToCode(charName) ?? fontMapping?.NameToCode(charName);
if (code != null)
{
codes[charCode] = code.Value;
}
else
{
System.Diagnostics.Debug.WriteLine($" {charName}");
}
}
charCodeData[0]++;
}
}
}
}
/**
* Sets the glyph widths in the font dictionary.
*/
private void SetWidths(PdfDictionary font, GlyphMapping glyphList)
{
float scaling = 1000f / ttf.Header.UnitsPerEm;
HorizontalMetricsTable hmtx = ttf.HorizontalMetrics;
Dictionary <int, string> codeToName = FontEncoding.CodeToNameMap;
int firstChar = codeToName.Keys.Min();
int lastChar = codeToName.Keys.Max();
List <int> widths = new List <int>(lastChar - firstChar + 1);
for (int i = 0; i < lastChar - firstChar + 1; i++)
{
widths.Add(0);
}
// a character code is mapped to a glyph name via the provided font encoding
// afterwards, the glyph name is translated to a glyph ID.
foreach (KeyValuePair <int, string> entry in codeToName)
{
int code = entry.Key;
string name = entry.Value;
if (code >= firstChar && code <= lastChar)
{
var charCode = glyphList.ToUnicode(name) ?? 0;
int gid = cmapLookup.GetGlyphId(charCode);
widths[entry.Key - firstChar] = (int)Math.Round(hmtx.GetAdvanceWidth(gid) * scaling);
}
}
font[PdfName.FirstChar] = PdfInteger.Get(firstChar);
font[PdfName.LastChar] = PdfInteger.Get(lastChar);
font[PdfName.Widths] = new PdfArray(widths.Select(p => PdfInteger.Get(p)).ToList());
}
