Package com.adobe.fontengine.font.opentype

Class LookupTable

java.lang.Object

com.adobe.fontengine.font.opentype.Table

com.adobe.fontengine.font.opentype.LayoutTable

com.adobe.fontengine.font.opentype.LookupTable

Direct Known Subclasses:

Gpos, Gsub

public abstract class LookupTable
extends LayoutTable

A LookupTable is the base class for GSUB/GPOS tables. It captures:

• the resolution of feature tags to lookup indices
• the common lookup types (contextual, chaining contextual and extension)

Constructor Summary

Constructors

Constructor	Description
LookupTable(FontByteArray buffer)

Method Summary

Modifier and Type	Method	Description
int	applyLookups(int[] lookupOffsets, AttributedRun run, int start, int limit, OTSelector selector, Gdef gdef)
boolean	featureIsPresent(int featureTag)
int[][]	resolveFeatureTag(int scriptTag, int langSysTag, int[] featureTags)	Resolves a script/lang/feature list to a set of lookup offsets.

Methods inherited from class java.lang.Object

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

Constructor Detail

LookupTable

public LookupTable(FontByteArray buffer)
            throws IOException,
                   InvalidFontException,
                   UnsupportedFontException

Throws:

IOException

InvalidFontException

UnsupportedFontException

Method Detail

resolveFeatureTag

public int[][] resolveFeatureTag(int scriptTag,
                                 int langSysTag,
                                 int[] featureTags)
                          throws InvalidFontException

Resolves a script/lang/feature list to a set of lookup offsets. The lookups of the required feature are not included, but can be obtained by resolving Tag.feature_REQUIRED.

Parameters:

scriptTag - the script under which to resolve the feature

langSysTag - the langage under which to resolve the feature

featureTags - the features to resolve

Returns:

array of lookup offsets; may be empty but never null

Throws:

InvalidFontException

featureIsPresent

public boolean featureIsPresent(int featureTag)
                         throws InvalidFontException

Throws:

InvalidFontException

applyLookups

public int applyLookups(int[] lookupOffsets,
                        AttributedRun run,
                        int start,
                        int limit,
                        OTSelector selector,
                        Gdef gdef)
                 throws InvalidFontException

Throws:

InvalidFontException