Glifos y métricas de fuentes TrueType | .NET

Obtener métricas de fuentes

Las métricas de fuentes contienen información como “Ascender”, “Descender”, “TypoAscender”, “TypoDescender” y “UnitsPerEm”. Aspose.Font para .NET API puede leer la información de métricas de fuentes del archivo de fuentes TrueType utilizando el siguiente código de muestra.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
 2string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path
 3
 4FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 5TtfFont font = Aspose.Font.Font.Open(fd) as TtfFont;
 6
 7string name = font.FontName;
 8Console.WriteLine("Font name: " + name);
 9Console.WriteLine("Glyph count: " + font.NumGlyphs);
10string metrics = string.Format(
11    "Font metrics: ascender - {0}, descender - {1}, typo ascender = {2}, typo descender = {3}, UnitsPerEm = {4}",
12    font.Metrics.Ascender, font.Metrics.Descender,
13    font.Metrics.TypoAscender, font.Metrics.TypoDescender, font.Metrics.UnitsPerEM);
14
15Console.WriteLine(metrics);
16
17//Get cmap unicode encoding table from font as object TtfCMapFormatBaseTable to access information about font glyph for symbol 'A'.
18//Also check that font has object TtfGlyfTable (table 'glyf') to access glyph.
19Aspose.Font.TtfCMapFormats.TtfCMapFormatBaseTable cmapTable = null;
20if (font.TtfTables.CMapTable != null)
21{
22    cmapTable = font.TtfTables.CMapTable.FindUnicodeTable();
23}
24if (cmapTable != null && font.TtfTables.GlyfTable != null)
25{
26    Console.WriteLine("Font cmap unicode table: PlatformID = " + cmapTable.PlatformId + ", PlatformSpecificID = " + cmapTable.PlatformSpecificId);
27
28    //Code for 'A' symbol
29    char unicode = (char)65;
30
31    //Glyph index for 'A'
32    uint glIndex = cmapTable.GetGlyphIndex(unicode);
33
34    if (glIndex != 0)
35    {
36        //Glyph for 'A'
37        Glyph glyph = font.GetGlyphById(glIndex);
38        if (glyph != null)
39        {
40            //Print glyph metrics
41            Console.WriteLine("Glyph metrics for 'A' symbol:");
42            string bbox = string.Format(
43                "Glyph BBox: Xmin = {0}, Xmax = {1}" + ", Ymin = {2}, Ymax = {3}",
44                glyph.GlyphBBox.XMin, glyph.GlyphBBox.XMax,
45                glyph.GlyphBBox.YMin, glyph.GlyphBBox.YMax);
46            Console.WriteLine(bbox);
47            Console.WriteLine("Width:" + font.Metrics.GetGlyphWidth(new GlyphUInt32Id(glIndex)));
48        }
49    }
50}

Detectar símbolos latinos

Aspose.Font para .NET le permite detectar símbolos latinos a partir de archivos de fuentes TrueType. Esto se puede lograr utilizando el siguiente código de muestra.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
 2string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path
 3
 4FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 5TtfFont ttfFont = Aspose.Font.Font.Open(fd) as TtfFont;
 6
 7bool latinText = true;
 8
 9
10for (uint code = 65; code < 123; code++)
11{
12    GlyphId gid = ttfFont.Encoding.DecodeToGid(code);
13    if (gid == null || gid == GlyphUInt32Id.NotDefId)
14    {
15        latinText = false;
16    }
17}
18
19if (latinText)
20{
21    Console.WriteLine(string.Format("Font {0} supports latin symbols.", ttfFont.FontName));
22}
23else
24{
25    Console.WriteLine(string.Format("Latin symbols are not supported by font {0}.", ttfFont.FontName));
26}

Extraer restricciones de licencia

Utilice Aspose.Font para .NET API para extraer restricciones de licencia de archivos de fuentes. Las fuentes pueden tener información de licencia incorporada en uno de los siguientes modos.

El siguiente ejemplo de código muestra cómo utilizar un objeto Aspose.Font.Ttf.LicenseFlags para obtener información sobre las restricciones de licencia de fuentes (marca fsType de la tabla OS/2) de forma cómoda.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
 2string dataDir = RunExamples.GetDataDir_Data();
 3//Font to check
 4string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path
 5
 6FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 7TtfFont font = Aspose.Font.Font.Open(fd) as TtfFont;
 8LicenseFlags licenseFlags = null;
 9if (font.TtfTables.Os2Table != null)
10{
11    licenseFlags = font.TtfTables.Os2Table.GetLicenseFlags();
12}
13
14if (licenseFlags == null || licenseFlags.FSTypeAbsent)
15{
16    Console.WriteLine(string.Format("Font {0} has no embedded license restrictions", font.FontName));
17}
18else
19{
20    if (licenseFlags.IsEditableEmbedding)
21    {
22        Console.WriteLine(
23            string.Format("Font {0} may be embedded, and may be temporarily loaded on other systems.", font.FontName)
24            + " In addition, editing is permitted, including ability to format new text"
25            + " using the embedded font, and changes may be saved.");
26    }
27    else if (licenseFlags.IsInstallableEmbedding)
28    {
29        Console.WriteLine(
30            string.Format("Font {0} may be embedded, and may be permanently installed", font.FontName)
31            + " for use on a remote systems, or for use by other users.");
32    }
33    else if (licenseFlags.IsPreviewAndPrintEmbedding)
34    {
35        Console.WriteLine(
36            string.Format("Font {0} may be embedded, and may be temporarily loaded", font.FontName)
37            + "  on other systems for purposes of viewing or printing the document.");
38    }
39    else if (licenseFlags.IsRestrictedLicenseEmbedding)
40    {
41        Console.WriteLine(
42            string.Format("Font {0} must not be modified, embedded or exchanged in any manner", font.FontName)
43            + " without first obtaining explicit permission of the legal owner.");
44    }
45}

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