GlyphSubstitutionTable

java.lang.Object
- org.apache.fontbox.ttf.TTFTable
- - org.apache.fontbox.ttf.GlyphSubstitutionTable

```
public class GlyphSubstitutionTable
extends TTFTable
```
A glyph substitution 'GSUB' table in a TrueType or OpenType font.

Author:

Aaron Madlon-Kay

Field Summary

Fields
Modifier and Type Field Description

static java.lang.String TAG
- Fields inherited from class org.apache.fontbox.ttf.TTFTable
  font, initialized

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getSubstitution(int gid, java.lang.String[] scriptTags, java.util.List<java.lang.String> enabledFeatures)`	Apply glyph substitutions to the supplied gid.
`int`	`getUnsubstitution(int sgid)`	For a substitute-gid (obtained from `getSubstitution(int, String[], List)`), retrieve the original gid.

Methods inherited from class org.apache.fontbox.ttf.TTFTable
getCheckSum, getInitialized, getLength, getOffset, getTag

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - TAG
```
public static final java.lang.String TAG
```
    See Also:
    
    Constant Field Values
- Method Detail
  - getSubstitution
```
public int getSubstitution(int gid,
                           java.lang.String[] scriptTags,
                           java.util.List<java.lang.String> enabledFeatures)
```
    Apply glyph substitutions to the supplied gid. The applicable substitutions are determined by the scriptTags which indicate the language of the gid, and by the list of enabledFeatures. To ensure that a single gid isn't mapped to multiple substitutions, subsequent invocations with the same gid will return the same result as the first, regardless of script or enabled features.
    
    Parameters:
    
    gid - GID
    
    scriptTags - Script tags applicable to the gid (see OpenTypeScript)
    
    enabledFeatures - list of features to apply
  - getUnsubstitution
```
public int getUnsubstitution(int sgid)
```
    For a substitute-gid (obtained from getSubstitution(int, String[], List)), retrieve the original gid.
    Only gids previously substituted by this instance can be un-substituted. If you are trying to unsubstitute before you substitute, something is wrong.
    
    Parameters:
    
    sgid - Substitute GID
    
    Returns:
    
    the original gid of a substitute-gid