Package com.itextpdf.io.font

Class TrueTypeFontSubset

java.lang.Object

com.itextpdf.io.font.TrueTypeFontSubset

class TrueTypeFontSubset
extends java.lang.Object

Subsets a True Type font by removing the unneeded glyphs from the font.

Field Summary

Fields

Modifier and Type	Field	Description
private static int	ARG_1_AND_2_ARE_WORDS
private int	directoryOffset
private static int[]	entrySelectors
private java.lang.String	fileName	The file name.
private int	fontPtr
private int	glyfTableRealSize
private java.util.List<java.lang.Integer>	glyphsInList
private java.util.Set<java.lang.Integer>	glyphsUsed
private static int	HEAD_LOCA_FORMAT_OFFSET
private boolean	locaShortTable
private int[]	locaTable
private int	locaTableRealSize
private static int	MORE_COMPONENTS
private byte[]	newGlyfTable
private int[]	newLocaTable
private byte[]	newLocaTableOut
private byte[]	outFont
protected RandomAccessFileOrArray	rf	The file in use.
private static int	TABLE_CHECKSUM
private static int	TABLE_LENGTH
private static java.lang.String[]	TABLE_NAMES
private static java.lang.String[]	TABLE_NAMES_SUBSET
private static int	TABLE_OFFSET
private java.util.Map<java.lang.String,int[]>	tableDirectory	Contains the location of the several tables.
private int	tableGlyphOffset
private java.lang.String[]	tableNames
private static int	WE_HAVE_A_SCALE
private static int	WE_HAVE_A_TWO_BY_TWO
private static int	WE_HAVE_AN_X_AND_Y_SCALE

Constructor Summary

Constructors

Constructor	Description
TrueTypeFontSubset(java.lang.String fileName, RandomAccessFileOrArray rf, java.util.Set<java.lang.Integer> glyphsUsed, int directoryOffset, boolean subset)	Creates a new TrueTypeFontSubSet

Method Summary

Modifier and Type	Method	Description
private void	assembleFont()
private int	calculateChecksum(byte[] b)
private void	checkGlyphComposite(int glyph)
private void	createNewGlyphTables()
private void	createTableDirectory()
private void	flatGlyphs()
private void	locaToBytes()
(package private) byte[]	process()	Does the actual work of subsetting the font.
private void	readLoca()
private java.lang.String	readStandardString(int length)	Reads a String from the font file as bytes using the Cp1252 encoding.
private void	writeFontInt(int n)
private void	writeFontShort(int n)
private void	writeFontString(java.lang.String s)

Methods inherited from class java.lang.Object

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

Field Detail

TABLE_NAMES_SUBSET

private static final java.lang.String[] TABLE_NAMES_SUBSET

TABLE_NAMES

private static final java.lang.String[] TABLE_NAMES

entrySelectors

private static final int[] entrySelectors

TABLE_CHECKSUM

private static final int TABLE_CHECKSUM

See Also:

Constant Field Values

TABLE_OFFSET

private static final int TABLE_OFFSET

See Also:

Constant Field Values

TABLE_LENGTH

private static final int TABLE_LENGTH

See Also:

Constant Field Values

HEAD_LOCA_FORMAT_OFFSET

private static final int HEAD_LOCA_FORMAT_OFFSET

See Also:

Constant Field Values

ARG_1_AND_2_ARE_WORDS

private static final int ARG_1_AND_2_ARE_WORDS

See Also:

Constant Field Values

WE_HAVE_A_SCALE

private static final int WE_HAVE_A_SCALE

See Also:

Constant Field Values

MORE_COMPONENTS

private static final int MORE_COMPONENTS

See Also:

Constant Field Values

WE_HAVE_AN_X_AND_Y_SCALE

private static final int WE_HAVE_AN_X_AND_Y_SCALE

See Also:

Constant Field Values

WE_HAVE_A_TWO_BY_TWO

private static final int WE_HAVE_A_TWO_BY_TWO

See Also:

Constant Field Values

tableDirectory

private java.util.Map<java.lang.String,int[]> tableDirectory

Contains the location of the several tables. The key is the name of the table and the value is an int[3] where position 0 is the checksum, position 1 is the offset from the start of the file and position 2 is the length of the table.

rf

protected RandomAccessFileOrArray rf

The file in use.

fileName

private java.lang.String fileName

The file name.

locaShortTable

private boolean locaShortTable

locaTable

private int[] locaTable

glyphsUsed

private java.util.Set<java.lang.Integer> glyphsUsed

glyphsInList

private java.util.List<java.lang.Integer> glyphsInList

tableGlyphOffset

private int tableGlyphOffset

newLocaTable

private int[] newLocaTable

newLocaTableOut

private byte[] newLocaTableOut

newGlyfTable

private byte[] newGlyfTable

glyfTableRealSize

private int glyfTableRealSize

locaTableRealSize

private int locaTableRealSize

outFont

private byte[] outFont

fontPtr

private int fontPtr

directoryOffset

private int directoryOffset

tableNames

private final java.lang.String[] tableNames

Constructor Detail

TrueTypeFontSubset

TrueTypeFontSubset(java.lang.String fileName,
                   RandomAccessFileOrArray rf,
                   java.util.Set<java.lang.Integer> glyphsUsed,
                   int directoryOffset,
                   boolean subset)

Creates a new TrueTypeFontSubSet

Parameters:

directoryOffset - The offset from the start of the file to the table directory

fileName - the file name of the font

glyphsUsed - the glyphs used

Method Detail

process

byte[] process()
        throws java.io.IOException

Does the actual work of subsetting the font.

Returns:

the subset font

Throws:

java.io.IOException - on error

assembleFont

private void assembleFont()
                   throws java.io.IOException

Throws:

java.io.IOException

createTableDirectory

private void createTableDirectory()
                           throws java.io.IOException

Throws:

java.io.IOException

readLoca

private void readLoca()
               throws java.io.IOException

Throws:

java.io.IOException

createNewGlyphTables

private void createNewGlyphTables()
                           throws java.io.IOException

Throws:

java.io.IOException

locaToBytes

private void locaToBytes()

flatGlyphs

private void flatGlyphs()
                 throws java.io.IOException

Throws:

java.io.IOException

checkGlyphComposite

private void checkGlyphComposite(int glyph)
                          throws java.io.IOException

Throws:

java.io.IOException

readStandardString

private java.lang.String readStandardString(int length)
                                     throws java.io.IOException

Reads a String from the font file as bytes using the Cp1252 encoding.

Parameters:

length - the length of bytes to read

Returns:

the String read

Throws:

java.io.IOException - the font file could not be read

writeFontShort

private void writeFontShort(int n)

writeFontInt

private void writeFontInt(int n)

writeFontString

private void writeFontString(java.lang.String s)

calculateChecksum

private int calculateChecksum(byte[] b)