 | If you need to use any font other than the 14 core fonts supported by Adobe Reader, than you must embed the font description while generating Pdf file. If font information is not embedded, Adobe Reader will take it from the Operating System if it’s installed over the system, or it will construct a substitute font according to the font descriptor in the Pdf. |
Solution
We use the property IsFontEmbedded to embed the font information into Pdf file. Setting the value of this property to ‘True’ will embed the complete font file into the Pdf, knowing the fact that it will increase the Pdf file size.
Following is the code snippet that can be used to embed the font information into Pdf.
//Instantiate Pdf instance by calling it empty constructor Aspose.Pdf.Generator.Pdf pdf1 = new Aspose.Pdf.Generator.Pdf(); //Create a section in the Pdf object Aspose.Pdf.Generator.Section sec1 = pdf1.Sections.Add(); //Create a text paragraph inheriting text format settings from the section Aspose.Pdf.Generator.Text text1 = new Aspose.Pdf.Generator.Text(sec1); //Add the text paragraph to the section sec1.Paragraphs.Add(text1); //Create a text segment Aspose.Pdf.Generator.Segment s1 = new Aspose.Pdf.Generator.Segment(" This is a sample text using Custom font"); //Set the font name to the TextInfo.FontName property of segment, where ‘Almonto Snow’ is custom font name s1.TextInfo.FontName = "Almonte Snow"; // Set the value for property to include the font description into Pdf file s1.TextInfo.IsFontEmbedded = true; //Add the text segment to the text paragraph text1.Segments.Add(s1); //Save the Pdf pdf1.Save(@"C:\ Font_Embeded.pdf");
'Instantiate Pdf instance by calling it empty constructor Dim pdf As Aspose.Pdf.Generator.Pdf = New Aspose.Pdf.Generator.Pdf() 'Create a section in the Pdf object Dim sec1 As Aspose.Pdf.Generator.Section = pdf.Sections.Add() 'Create a text paragraph inheriting text format settings from the section Dim text1 As Aspose.Pdf.Generator.Text = New Aspose.Pdf.Generator.Text(sec1) 'Add the text paragraph to the section sec1.Paragraphs.Add(text1); 'Create a text segment Dim s1 As Aspose.Pdf.Generator.Segment = New Aspose.Pdf.Generator.Segment (" This is a sample text using Custom font"); 'Set the font name to the TextInfo.FontName property of segment, where ‘Almonto Snow’ is custom font name s1.TextInfo.FontName = "Almonte Snow"; 'Set the value for property to include the font description into Pdf file s1.TextInfo.IsFontEmbedded = true; 'Add the text segment to the text paragraph text1.Segments.Add(s1); 'Save the Pdf pdf1.Save(@"C:\ Font_Embeded.pdf");
<?xml version="1.0" encoding="utf-8" ?> <Pdf xmlns="Aspose.Pdf"> <Section> <Text> <Segment FontName="Almonte Snow" IsFontEmbedded = "true"> This is a sample text using Custom font</Segment> </Text> </Section> </Pdf>
There is another way to embed the font information into the Pdf file by using IsUnicode property. The font subset will be embedded. That means not the complete font file is embedded, but the subset that is used in the PDF is embedded. The file size of the PDF may be smaller than that of complete embedding of font file using IsFontEmbedded .
In the upper specified code simply change one line and use the rest of code as it is.
s1.TextInfo.IsUnicode = true;
We can also set the property value pdf1.TextInfo.IsFontEmbedded = true; instead of calling SetUnicode() As a result it will embed the whole font description into resultant Pdf and it may increase the size of Pdf.
Each font has a set of supported characters. Sometimes, users may assign a font to a Segment paragraph which doesn't support every character appear in the Segment. Since the release of Aspose.Pdf 4.0.0 a new feature has been introduced to assign proper font to segments according to its contents. For this sake a property named IsAutoFontAdjusted has been added to Pdf class. If its value is set to true, a proper font to segments is assigned automatically.
Font Embedding when using Text String containing HTML Tags
We often need to display the HTML contents in Pdf in the same HTML format. Therefore we use Text.IsHtmlTagSupported property to accomplish this requirement. While using In-line formatting we may use custom fonts and in order to embed the custom font into resultant Pdf we need to use I sUnicode=true.
//Instantiate a pdf document Aspose.Pdf.Generator.Pdf pdf1 = new Aspose.Pdf.Generator.Pdf(); //Create a section in the pdf document Aspose.Pdf.Generator.Section sec1 = pdf1.Sections.Add(); //Create string variables with text containing html tags string s = "<html><body><font isUnicode='true' face='Bete Noir NF' size=18><i>Sample text </i>with Custome font Embedded </font><br><font isUnicode='true' face='Courier New' size=10><s>Sample Text </s>in <u>Courier New</u> font</font></body></html>"; //Create text paragraphs containing HTML text Aspose.Pdf.Generator.Text t1 = new Aspose.Pdf.Generator.Text(s); //Enable the HTML tag support property t1.IsHtmlTagSupported = true; //Add the text paragraphs containing HTML text to the section sec1.Paragraphs.Add(t1); //Save the pdf document pdf1.Save("inLineFormated_HtmlSuported.pdf");
'Instantiate a pdf document Dim pdf As Aspose.Pdf.Generator.Pdf = New Aspose.Pdf.Generator.Pdf() 'Create a section in the pdf document Dim sec1 As Aspose.Pdf.Generator.Section = pdf.Sections.Add() 'Create string variables with text containing html tags Dim s As String = "<html><head></head><body><font isUnicode='true' face=' Bete Noir NF' size=18><i>Sample text </i>with Custome font Embedded </font><br><font isUnicode='true' face='Courier New' size=10><s>Sample Text </s>in <u>Courier New</u> font</font></body></html>" 'Create text paragraphs containing HTML text Dim t1 As Aspose.Pdf.Generator.Text = New Aspose.Pdf.Generator.Text(s) 'Enable the HTML tag support property t1.IsHtmlTagSupported = True 'Add the text paragraphs containing HTML text to the section sec1.Paragraphs.Add(t1) 'Save the pdf document pdf.Save("inlinehtml.pdf")
Fig: Output generated when HTML font is rendered into PDF and font is embedded.
 | ‘Almonte Snow’ is the custom font installed over the system. |