Module org.sejda.sambox

Package org.sejda.sambox.pdmodel.font

Class BaseTTFSubsetter

java.lang.Object

org.sejda.sambox.pdmodel.font.BaseTTFSubsetter

All Implemented Interfaces:

Function<String,COSStream>

public abstract class BaseTTFSubsetter
extends Object
implements Function<String,COSStream>

Skeletal implementation for a TTF subsetter. To be used to subset embedded TrueType font and Type 0 fonts with CIDFontType2 descendant This is based on the TTFSubsetter in FontBox.

Field Summary

Fields

Modifier and Type	Field	Description
private final SortedMap<Integer,Integer>	codeToGIDLookup
private final COSDictionary	existingFont
private org.apache.fontbox.ttf.TrueTypeFont	font
private final COSStream	fontFileStream
private final org.sejda.io.SeekableSource	fontSource
private final SortedSet<Integer>	glyphIds
private static final org.slf4j.Logger	LOG
private int	numberOfGlyphs
private static final byte[]	PAD_BUF

Constructor Summary

Constructors

Constructor	Description
BaseTTFSubsetter(COSDictionary existingFont, COSStream fontFileStream)
BaseTTFSubsetter(COSDictionary existingFont, COSStream fontFileStream, org.apache.fontbox.ttf.TrueTypeFont font)

Method Summary

Modifier and Type	Method	Description
private void	addCompositeGlyphs()
COSStream	apply(String subsetFontName)	Creates a subset of the font file containing only the glyphs added to this subsetter.
protected byte[]	buildCMapTable()
protected byte[]	buildGlyfTable(long[] newOffsets)
protected byte[]	buildHeadTable()
protected byte[]	buildHheaTable()
protected byte[]	buildHmtxTable()
protected byte[]	buildLocaTable(long[] newOffsets)
protected byte[]	buildMaxpTable()
protected byte[]	buildNameTable(String subsetFontName)
protected byte[]	buildOS2Table()
protected byte[]	buildPostTable()
private void	copyBytes(OutputStream os, long offset, int count)
abstract COSStream	doSubset(String subsetFontName)
org.apache.fontbox.ttf.TrueTypeFont	getFont()
SortedSet<Integer>	getGlyphIds()
private boolean	isComposite(ByteBuffer glyphData)
private int	log2(int num)
void	putAll(Map<Integer,Integer> codesToGID)	Adds all the given mappings code -> GID to this subsetter
void	setNumberOfGlyphs(int numberOfGlyphs)	Initialize the subsetter before performing a subset
(package private) boolean	shouldCopyNameRecord(org.apache.fontbox.ttf.NameRecord nr)
private long	toUInt32(byte[] bytes)
private long	toUInt32(int high, int low)
protected void	updateChecksum(DataOutputStream out, Map<String,byte[]> tables)
private long	writeFileHeader(DataOutputStream out, int nTables)
private void	writeFixed(DataOutputStream out, double f)
private void	writeLongDateTime(DataOutputStream out, Calendar calendar)
private void	writeSInt16(DataOutputStream out, short i)
void	writeTableBody(OutputStream os, byte[] bytes)
private long	writeTableHeader(DataOutputStream out, String tag, long offset, byte[] bytes)
private void	writeUint16(DataOutputStream out, int i)
private void	writeUint32(DataOutputStream out, long l)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose

Field Details

LOG

private static final org.slf4j.Logger LOG

PAD_BUF

private static final byte[] PAD_BUF

fontSource

private final org.sejda.io.SeekableSource fontSource

glyphIds

private final SortedSet<Integer> glyphIds

codeToGIDLookup

private final SortedMap<Integer,Integer> codeToGIDLookup

fontFileStream

private final COSStream fontFileStream

existingFont

private final COSDictionary existingFont

font

private org.apache.fontbox.ttf.TrueTypeFont font

numberOfGlyphs

private int numberOfGlyphs

Constructor Details

BaseTTFSubsetter

public BaseTTFSubsetter(COSDictionary existingFont,
 COSStream fontFileStream,
 org.apache.fontbox.ttf.TrueTypeFont font)
                 throws IOException

Parameters:

existingFont - the font dictionary that will be updated

fontFileStream - the corresponding not subsetted FontFile2

font - the existing and already parsed font. If null the fontFileStream will be parsed to get the ttf font when needed

Throws:

IOException

BaseTTFSubsetter

public BaseTTFSubsetter(COSDictionary existingFont,
 COSStream fontFileStream)
                 throws IOException

Throws:

IOException

Method Details

putAll

public void putAll(Map<Integer,Integer> codesToGID)

Adds all the given mappings code -> GID to this subsetter

Parameters:

codesToGID -

apply

public COSStream apply(String subsetFontName)

Creates a subset of the font file containing only the glyphs added to this subsetter. If anything happens null is returned

Specified by:

apply in interface Function<String,COSStream>

Parameters:

subsetFontName - the new subset font name

Returns:

the subsetted font stream or null if anything went wrong

getFont

public org.apache.fontbox.ttf.TrueTypeFont getFont()
                                            throws IOException

Throws:

IOException

getGlyphIds

public SortedSet<Integer> getGlyphIds()

doSubset

public abstract COSStream doSubset(String subsetFontName)
                            throws IOException

Throws:

IOException

setNumberOfGlyphs

public void setNumberOfGlyphs(int numberOfGlyphs)

Initialize the subsetter before performing a subset

updateChecksum

protected void updateChecksum(DataOutputStream out,
 Map<String,byte[]> tables)
                       throws IOException

Throws:

IOException

addCompositeGlyphs

private void addCompositeGlyphs()
                         throws IOException

Throws:

IOException

isComposite

private boolean isComposite(ByteBuffer glyphData)

buildHeadTable

protected byte[] buildHeadTable()
                         throws IOException

Throws:

IOException

buildHheaTable

protected byte[] buildHheaTable()
                         throws IOException

Throws:

IOException

buildMaxpTable

protected byte[] buildMaxpTable()
                         throws IOException

Throws:

IOException

buildNameTable

protected byte[] buildNameTable(String subsetFontName)
                         throws IOException

Throws:

IOException

shouldCopyNameRecord

boolean shouldCopyNameRecord(org.apache.fontbox.ttf.NameRecord nr)

buildGlyfTable

protected byte[] buildGlyfTable(long[] newOffsets)
                         throws IOException

Throws:

IOException

buildLocaTable

protected byte[] buildLocaTable(long[] newOffsets)
                         throws IOException

Throws:

IOException

buildHmtxTable

protected byte[] buildHmtxTable()
                         throws IOException

Throws:

IOException

buildPostTable

protected byte[] buildPostTable()
                         throws IOException

Throws:

IOException

buildOS2Table

protected byte[] buildOS2Table()
                        throws IOException

Throws:

IOException

buildCMapTable

protected byte[] buildCMapTable()
                         throws IOException

Throws:

IOException

copyBytes

private void copyBytes(OutputStream os,
 long offset,
 int count)
                throws IOException

Throws:

IOException

writeFixed

private void writeFixed(DataOutputStream out,
 double f)
                 throws IOException

Throws:

IOException

writeUint32

private void writeUint32(DataOutputStream out,
 long l)
                  throws IOException

Throws:

IOException

writeUint16

private void writeUint16(DataOutputStream out,
 int i)
                  throws IOException

Throws:

IOException

writeSInt16

private void writeSInt16(DataOutputStream out,
 short i)
                  throws IOException

Throws:

IOException

writeLongDateTime

private void writeLongDateTime(DataOutputStream out,
 Calendar calendar)
                        throws IOException

Throws:

IOException

writeFileHeader

private long writeFileHeader(DataOutputStream out,
 int nTables)
                      throws IOException

Parameters:

out - The data output stream.

nTables - The number of table.

Returns:

The file offset of the first TTF table to write.

Throws:

IOException - Upon errors.

writeTableHeader

private long writeTableHeader(DataOutputStream out,
 String tag,
 long offset,
 byte[] bytes)
                       throws IOException

Throws:

IOException

writeTableBody

public void writeTableBody(OutputStream os,
 byte[] bytes)
                    throws IOException

Throws:

IOException

toUInt32

private long toUInt32(int high,
 int low)

toUInt32

private long toUInt32(byte[] bytes)

log2

private int log2(int num)