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## org.apache.fop.complexscripts.fonts
Class GlyphPositioningState

    java.lang.Object
      org.apache.fop.complexscripts.fonts.GlyphProcessingState
          org.apache.fop.complexscripts.fonts.GlyphPositioningState

    public class GlyphPositioningState

extends GlyphProcessingState

The `GlyphPositioningState` implements an state object used during glyph positioning processing.

This work was originally authored by Glenn Adams (gadams@apache.org).

Field Summary

Fields inherited from class org.apache.fop.complexscripts.fonts.GlyphProcessingState
`classMatchSet, consumed, feature, gct, gdef, ignoreBase, ignoreDefault, ignoreLigature, ignoreMark, igs, index, indexLast, language, lookupFlags, script, sct`

Constructor Summary
`GlyphPositioningState()` Construct default (reset) glyph positioning state.
`GlyphPositioningState(GlyphPositioningState ps)` Construct glyph positioning state using an existing state object using shallow copy except as follows: input glyph sequence is copied deep except for its characters array.
`GlyphPositioningState(GlyphSequence gs, java.lang.String script, java.lang.String language, java.lang.String feature, int fontSize, int[] widths, int[][] adjustments, ScriptContextTester sct)` Construct glyph positioning state.

Method Summary
`boolean` | `adjust(GlyphPositioningTable.Value v)` Perform adjustments at current position index.
`boolean` | `adjust(GlyphPositioningTable.Value v, int offset)` Perform adjustments at specified offset from current position index.
`boolean` | `apply(GlyphPositioningSubtable st)` Apply positioning subtable to current state at current position (only), resulting in the consumption of zero or more input glyphs.
`boolean` | `apply(GlyphTable.RuleLookup[] lookups, int nig)` Apply a sequence of matched rule lookups to the `nig` input glyphs starting at the current position.
`void` | `applyDefault()` Apply default application semantices; namely, consume one input glyph.
`boolean` | `getAdjusted()` Get adjusted state.
`int[]` | `getAdjustment()` Obtain current adjustments at current position index.
`int[]` | `getAdjustment(int offset)` Obtain current adjustments at specified offset from current position index.
`int` | `getWidth(int gi)` Obtain design advancement (width) of glyph at specified index.
`GlyphPositioningState` | `reset(GlyphSequence gs, java.lang.String script, java.lang.String language, java.lang.String feature, int fontSize, int[] widths, int[][] adjustments, ScriptContextTester sct)` Reset glyph positioning state.
`void` | `setAdjusted(boolean adjusted)` Set adjusted state, used to record effect of non-zero adjustment.

Methods inherited from class org.apache.fop.complexscripts.fonts.GlyphProcessingState
`consume, didConsume, erase, getAssociation, getAssociation, getAssociations, getAssociations, getClassMatchSet, getCombinedAndTester, getCombinedIgnoreTester, getCombinedOrTester, getGDEF, getGlyph, getGlyph, getGlyphs, getGlyphs, getGlyphs, getGlyphsAvailable, getGlyphsAvailable, getGlyphsAvailable, getIgnoredAssociations, getIgnoredAssociations, getIgnoreDefault, getIgnoredGlyphs, getIgnoredGlyphs, getIgnoreTester, getInput, getLastPosition, getLookupFlags, getPosition, hasNext, hasNext, hasPrev, hasPrev, isBase, isIgnoredBase, isIgnoredGlyph, isIgnoredGlyph, isIgnoredGlyph, isIgnoredLigature, isIgnoredMark, isLigature, isMark, maybeApplicable, next, prev, replaceInput, replaceInput, reset, setGDEF, setGlyph, setIgnoreDefault, setLookupFlags, setPosition, updateSubtableState`

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

Constructor Detail

### GlyphPositioningState

    public GlyphPositioningState()

  Construct default (reset) glyph positioning state.

### GlyphPositioningState

    public GlyphPositioningState(GlyphSequence gs,
                                 java.lang.String script,
                                 java.lang.String language,
                                 java.lang.String feature,
                                 int fontSize,
                                 int[] widths,
                                 int[][] adjustments,
                                 ScriptContextTester sct)

  Construct glyph positioning state.

  Parameters:
    `gs` - input glyph sequence
    `script` - script identifier
    `language` - language identifier
    `feature` - feature identifier
    `fontSize` - font size (in micropoints)
    `widths` - array of design advancements (in glyph index order)
    `adjustments` - positioning adjustments to which positioning is applied
    `sct` - script context tester (or null)

### GlyphPositioningState

    public GlyphPositioningState(GlyphPositioningState ps)

  Construct glyph positioning state using an existing state object using shallow copy except as follows: input glyph sequence is copied deep except for its characters array.

  Parameters:
    `ps` - existing positioning state to copy from

Method Detail

### reset

    public GlyphPositioningState reset(GlyphSequence gs,
                                       java.lang.String script,
                                       java.lang.String language,
                                       java.lang.String feature,
                                       int fontSize,
                                       int[] widths,
                                       int[][] adjustments,
                                       ScriptContextTester sct)

  Reset glyph positioning state.

  Parameters:
    `gs` - input glyph sequence
    `script` - script identifier
    `language` - language identifier
    `feature` - feature identifier
    `fontSize` - font size (in micropoints)
    `widths` - array of design advancements (in glyph index order)
    `adjustments` - positioning adjustments to which positioning is applied
    `sct` - script context tester (or null)

### getWidth

    public int getWidth(int gi)

  Obtain design advancement (width) of glyph at specified index.

  Parameters:
    `gi` - glyph index
  Returns:
    design advancement, or zero if glyph index is not present

### adjust

    public boolean adjust(GlyphPositioningTable.Value v)

  Perform adjustments at current position index.

  Parameters:
    `v` - value containing adjustments
  Returns:
    true if a non-zero adjustment was made

### adjust

    public boolean adjust(GlyphPositioningTable.Value v,
                          int offset)

  Perform adjustments at specified offset from current position index.

  Parameters:
    `v` - value containing adjustments
    `offset` - from current position index
  Returns:
    true if a non-zero adjustment was made

### getAdjustment

    public int[] getAdjustment()

  Obtain current adjustments at current position index.

  Returns:
    array of adjustments (int[4]) at current position

### getAdjustment

    public int[] getAdjustment(int offset)
                        throws java.lang.IndexOutOfBoundsException

  Obtain current adjustments at specified offset from current position index.

  Parameters:
    `offset` - from current position index
  Returns:
    array of adjustments (int[4]) at specified offset
  Throws:
    `java.lang.IndexOutOfBoundsException` - if offset is invalid

### apply

    public boolean apply(GlyphPositioningSubtable st)

  Apply positioning subtable to current state at current position (only), resulting in the consumption of zero or more input glyphs.

  Parameters:
    `st` - the glyph positioning subtable to apply
  Returns:
    true if subtable applied, or false if it did not (e.g., its input coverage table did not match current input context)

### apply

    public boolean apply(GlyphTable.RuleLookup[] lookups,
                         int nig)

  Apply a sequence of matched rule lookups to the `nig` input glyphs starting at the current position. If lookups are non-null and non-empty, then all input glyphs specified by `nig` are consumed irregardless of whether any specified lookup applied.

  Parameters:
    `lookups` - array of matched lookups (or null)
    `nig` - number of glyphs in input sequence, starting at current position, to which the lookups are to apply, and to be consumed once the application has finished
  Returns:
    true if lookups are non-null and non-empty; otherwise, false

### applyDefault

    public void applyDefault()

  Apply default application semantices; namely, consume one input glyph.

  Overrides:
    `applyDefault` in class `GlyphProcessingState`

### setAdjusted

    public void setAdjusted(boolean adjusted)

  Set adjusted state, used to record effect of non-zero adjustment.

  Parameters:
    `adjusted` - true if to set adjusted state, otherwise false to clear adjusted state

### getAdjusted

    public boolean getAdjusted()

  Get adjusted state.

  Returns:
    adjusted true if some non-zero adjustment occurred and was recorded by `setAdjusted(boolean)`; otherwise, false.

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