org.extex.font.format.xtf.tables.gps
Class CoverageTable

java.lang.Object
  org.extex.font.format.xtf.tables.gps.CoverageTable

All Implemented Interfaces:

XMLWriterConvertible

Direct Known Subclasses:

CoverageTable1, CoverageTable2

public abstract class CoverageTable
extends java.lang.Object
implements XMLWriterConvertible

Class for a Coverage Table.

Each subtable (except an Extension LookupType subtable) in a lookup references a Coverage table (Coverage), which specifies all the glyphs affected by a substitution or positioning operation described in the subtable. The GSUB, GPOS, and GDEF tables rely on this notion of coverage. If a glyph does not appear in a Coverage table, the client can skip that subtable and move immediately to the next subtable.

A Coverage table identifies glyphs by glyph indices (GlyphIDs) either of two ways:

• As a list of individual glyph indices in the glyph set.
• As ranges of consecutive indices. The range format gives a number of start-glyph and end-glyph index pairs to denote the consecutive glyphs covered by the table.

In a Coverage table, a format code (CoverageFormat) specifies the format as an integer: 1 = lists, and 2 = ranges.

A Coverage table defines a unique index value (Coverage Index) for each covered glyph. This unique value specifies the position of the covered glyph in the Coverage table. The client uses the Coverage Index to look up values in the subtable for each glyph.

Version:

$Revision: 7274 $

Author:

Michael Niedermair

Constructor Summary

protected

CoverageTable(int format) Creates a new object.

Method Summary

int	getCoverageFormat() Getter for coverageFormat.
static CoverageTable	getInstance(RandomAccessR rar, int baseoffset, int offset) Return a instance.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.extex.util.xml.XMLWriterConvertible

writeXML

Constructor Detail

CoverageTable

protected CoverageTable(int format)

Creates a new object.

Parameters:

format - The format

Method Detail

getInstance

public static CoverageTable getInstance(RandomAccessR rar,
                                        int baseoffset,
                                        int offset)
                                 throws java.io.IOException

Return a instance.

Parameters:

rar - input

offset - The offset for the table.

baseoffset - The baseofset.

Returns:

TODO

Throws:

java.io.IOException - if a io-error occurred.

getCoverageFormat

public int getCoverageFormat()

Getter for coverageFormat.

Returns:

the coverageFormat