Class PDFFontEncoding

java.lang.Object

org.openpdf.renderer.font.PDFFontEncoding

public class PDFFontEncoding
extends Object

The PDFFont encoding encapsulates the mapping from character codes in the PDF document to glyphs of the font. Encodings take two basic forms. For Type1, TrueType, and Type3 fonts, the encoding maps from character codes to Strings, which represent the glyphs of the font. For Type0 fonts, the mapping is a CMap which maps character codes to characters in one of many descendant fonts. Note that the data in the PDF might be ASCII characters (bytes) or it might be a multi-byte format such as unicode. For now we will assume all glyph ids fit into at most the two bytes of a character.

Field Summary

Fields

Modifier and Type	Field	Description
private int[]	baseEncoding	the base encoding (an array of integers which can be mapped to names using the methods on FontSupport
private PDFCMap	cmap	a CMap for fonts encoded by CMap
private Map<Character, String>	differences	any differences from the base encoding
private PDFObject	mapName
private int	type	the type of this encoding (encoding or CMap)
private static final int	TYPE_CMAP
private static final int	TYPE_ENCODING	Encoding types

Constructor Summary

Constructors

Constructor	Description
PDFFontEncoding(String fontType, PDFObject encoding)	Creates a new instance of PDFFontEncoding
PDFFontEncoding(PDFCMap cmap)

Method Summary

Modifier and Type	Method	Description
private int[]	getBaseEncoding(String encodingName)	Get the base encoding for a given name
private PDFGlyph	getGlyphFromCMap(PDFFont font, char src)	Get a glyph from a CMap, given a Type0 font and a character
private PDFGlyph	getGlyphFromEncoding(PDFFont font, char src)	Get a glyph from an encoding, given a font and character
List<PDFGlyph>	getGlyphs(PDFFont font, String text)	Get the glyphs associated with a given String
boolean	isOneByteIdentity()
void	parseEncoding(PDFObject encoding)	Parse a PDF encoding object for the actual encoding

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

TYPE_ENCODING

private static final int TYPE_ENCODING

Encoding types

See Also:

• Constant Field Values

TYPE_CMAP

private static final int TYPE_CMAP

See Also:

• Constant Field Values

baseEncoding

private int[] baseEncoding

the base encoding (an array of integers which can be mapped to names using the methods on FontSupport

differences

private Map<Character, String> differences

any differences from the base encoding

cmap

private PDFCMap cmap

a CMap for fonts encoded by CMap

type

private int type

the type of this encoding (encoding or CMap)

mapName

private PDFObject mapName

Constructor Details

PDFFontEncoding

public PDFFontEncoding(PDFCMap cmap)

PDFFontEncoding

public PDFFontEncoding(String fontType,
 PDFObject encoding)
                throws IOException

Creates a new instance of PDFFontEncoding

Throws:

IOException

Method Details

getGlyphs

public List<PDFGlyph> getGlyphs(PDFFont font,
 String text)

Get the glyphs associated with a given String

getGlyphFromEncoding

private PDFGlyph getGlyphFromEncoding(PDFFont font,
 char src)

Get a glyph from an encoding, given a font and character

getGlyphFromCMap

private PDFGlyph getGlyphFromCMap(PDFFont font,
 char src)

Get a glyph from a CMap, given a Type0 font and a character

parseEncoding

public void parseEncoding(PDFObject encoding)
                   throws IOException

Parse a PDF encoding object for the actual encoding

Throws:

IOException

getBaseEncoding

private int[] getBaseEncoding(String encodingName)

Get the base encoding for a given name

isOneByteIdentity

public boolean isOneByteIdentity()