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

Constructors

Constructor and Description
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, String script, String language, String feature, int fontSize, int[] widths, int[][] adjustments, ScriptContextTester sct) Construct glyph positioning state.

Method Summary

Methods

Modifier and Type	Method and Description
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, String script, String language, 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, getUnprocessedGlyph, 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,
                     String script,
                     String language,
                     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,
                          String script,
                          String language,
                          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 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:

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.