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.

Author:

Andrea Vacondio

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
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()
abstract COSStream	doSubset(String subsetFontName)
org.apache.fontbox.ttf.TrueTypeFont	getFont()
SortedSet<Integer>	getGlyphIds()
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
protected void	updateChecksum(DataOutputStream out, Map<String,byte[]> tables)
void	writeTableBody(OutputStream os, byte[] bytes)

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

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

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

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

writeTableBody

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

Throws:

IOException