Glyphs and Metrics of TrueType Fonts | .NET

Get Font Metrics

Font metrics contain information such as Ascender, Descender, TypoAscender, TypoDescender and UnitsPerEm. Aspose.Font for .NET API can read the Font Metrics information from the TrueType Font file using the following sample code.

Detect Latin Symbols

Aspose.Font for .NET lets you detect Latin Symbols from TrueType font files. This can be achieved using the following sample code.

• Load the Font file using FontFileDefinition
• Decode the GlyphId using the DecodeToGid() method

// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path

FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
TtfFont ttfFont = Aspose.Font.Font.Open(fd) as TtfFont;

bool latinText = true;


for (uint code = 65; code < 123; code++)
{
    GlyphId gid = ttfFont.Encoding.DecodeToGid(code);
    if (gid == null || gid == GlyphUInt32Id.NotDefId)
    {
        latinText = false;
    }
}

if (latinText)
{
    Console.WriteLine(string.Format("Font {0} supports latin symbols.", ttfFont.FontName));
}
else
{
    Console.WriteLine(string.Format("Latin symbols are not supported by font {0}.", ttfFont.FontName));
}

Extract License Restrictions

Use Aspose.Font for .NET API to extract licensing restrictions from font files. Fonts can have licensing information embedded into these in one of the following modes.

• Editable Embedding - Font may be embedded, and may be temporarily loaded on other systems. In addition, editing is permitted, including ability to format new text using the embedded font, and changes may be saved.
• Installable Embedding - Font may be embedded, and may be permanently installed for use on a remote systems, or for use by other users.
• Preview and Print Embedding - Font may be embedded, and may be temporarily loaded on other systems for purposes of viewing or printing the document.
• Restricted Embedding - Font must not be modified, embedded or exchanged in any manner without first obtaining explicit permission of the legal owner.

The following code sample shows how to use an object Aspose.Font.Ttf.LicenseFlags to get information about font license restrictions(flag fsType from table OS/2) in convenient form.

// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
string dataDir = RunExamples.GetDataDir_Data();
//Font to check
string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path

FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
TtfFont font = Aspose.Font.Font.Open(fd) as TtfFont;
LicenseFlags licenseFlags = null;
if (font.TtfTables.Os2Table != null)
{
    licenseFlags = font.TtfTables.Os2Table.GetLicenseFlags();
}

if (licenseFlags == null || licenseFlags.FSTypeAbsent)
{
    Console.WriteLine(string.Format("Font {0} has no embedded license restrictions", font.FontName));
}
else
{
    if (licenseFlags.IsEditableEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be temporarily loaded on other systems.", font.FontName)
            + " In addition, editing is permitted, including ability to format new text"
            + " using the embedded font, and changes may be saved.");
    }
    else if (licenseFlags.IsInstallableEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be permanently installed", font.FontName)
            + " for use on a remote systems, or for use by other users.");
    }
    else if (licenseFlags.IsPreviewAndPrintEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be temporarily loaded", font.FontName)
            + "  on other systems for purposes of viewing or printing the document.");
    }
    else if (licenseFlags.IsRestrictedLicenseEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} must not be modified, embedded or exchanged in any manner", font.FontName)
            + " without first obtaining explicit permission of the legal owner.");
    }
}