Tries to remove unused glyphs from all fonts in the document.
BitMiracle.Docotic.Pdf (in BitMiracle.Docotic.Pdf.dll)
public PdfCollection<PdfFont> RemoveUnusedFontGlyphs()
Public Function RemoveUnusedFontGlyphs As PdfCollection(Of PdfFont)
The collection of fonts, where unused glyphs were successfully removed.
This method might fail to remove unused glyphs in the following cases:
Font is not embedded. For such fonts the Embedded
property is false.
Font is used in a PdfTextBox or PdfComboBox and
therefore all font glyphs should be preserved. A PDF reader or editor might be unable
to change text in a control if some glyphs are missed in the font.
Font is of an unsupported type. For now, only TrueType/OpenType (not CFF) fonts are supported.
This method is useful for decreasing size of produced PDF documents. The method
creates a font subsets with used glyphs only and embeds subsets in the current document.
A glyph is treated as used if the current document contains character drawn with the glyph.
This method does not remove unused glyphs from Type1 fonts.