Class GlyphPositioningSubtable
java.lang.Object
org.apache.fop.complexscripts.fonts.GlyphSubtable
org.apache.fop.complexscripts.fonts.GlyphPositioningSubtable
- All Implemented Interfaces:
Comparable,GlyphPositioning
The GlyphPositioningSubtable implements an abstract base of a glyph subtable,
providing a default implementation of the GlyphPositioning interface.
This work was originally authored by Glenn Adams (gadams@apache.org).
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Field Summary
Fields inherited from class org.apache.fop.complexscripts.fonts.GlyphSubtable
LF_IGNORE_BASE, LF_IGNORE_LIGATURE, LF_IGNORE_MARK, LF_INTERNAL_USE_REVERSE_SCAN, LF_MARK_ATTACHMENT_TYPE, LF_RESERVED, LF_RIGHT_TO_LEFT, LF_USE_MARK_FILTERING_SET -
Constructor Summary
ConstructorsModifierConstructorDescriptionprotectedGlyphPositioningSubtable(String id, int sequence, int flags, int format, GlyphCoverageTable coverage) Instantiate aGlyphPositioningSubtable. -
Method Summary
Modifier and TypeMethodDescriptionintbooleanisCompatible(GlyphSubtable subtable) Determine if a glyph subtable is compatible with this glyph subtable.booleanPerform glyph positioning at the current index, mutating the positioning state object as required.static final booleanposition(GlyphPositioningState ps, GlyphPositioningSubtable[] sta, int sequenceIndex) Apply positioning using specified state and subtable array.static final booleanposition(GlyphSequence gs, String script, String language, String feature, int fontSize, GlyphPositioningSubtable[] sta, int[] widths, int[][] adjustments, ScriptContextTester sct) Apply positioning.booleanMethods inherited from class org.apache.fop.complexscripts.fonts.GlyphSubtable
compareTo, equals, getClasses, getCoverage, getCoverageIndex, getCoverageSize, getEntries, getFlags, getFlags, getFormat, getGDEF, getLookupId, getSequence, getTable, getType, hashCode, resolveLookupReferences, setTable, usesReverseScan
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Constructor Details
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GlyphPositioningSubtable
protected GlyphPositioningSubtable(String id, int sequence, int flags, int format, GlyphCoverageTable coverage) Instantiate aGlyphPositioningSubtable.- Parameters:
id- subtable identifiersequence- subtable sequenceflags- subtable flagsformat- subtable formatcoverage- subtable coverage table
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Method Details
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getTableType
public int getTableType()- Specified by:
getTableTypein classGlyphSubtable- Returns:
- this subtable's table type
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getTypeName
- Specified by:
getTypeNamein classGlyphSubtable- Returns:
- this subtable's type name
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isCompatible
Determine if a glyph subtable is compatible with this glyph subtable. Two glyph subtables are compatible if the both may appear in a single lookup table.- Specified by:
isCompatiblein classGlyphSubtable- Parameters:
subtable- a glyph subtable to determine compatibility- Returns:
- true if specified subtable is compatible with this glyph subtable, where by compatible is meant that they share the same lookup type
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usesReverseScan
public boolean usesReverseScan()- Specified by:
usesReverseScanin classGlyphSubtable- Returns:
- true if subtable uses reverse scanning of glyph sequence, meaning from the last glyph in a glyph sequence to the first glyph
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position
Perform glyph positioning at the current index, mutating the positioning state object as required. Only the context associated with the current index is processed.- Specified by:
positionin interfaceGlyphPositioning- Parameters:
ps- glyph positioning state object- Returns:
- true if the glyph subtable applies, meaning that the current context matches the associated input context glyph coverage table; note that returning true does not mean any position adjustment occurred; it only means that no further glyph subtables for the current lookup table should be applied.
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position
public static final boolean position(GlyphPositioningState ps, GlyphPositioningSubtable[] sta, int sequenceIndex) Apply positioning using specified state and subtable array. For each position in input sequence, apply subtables in order until some subtable applies or none remain. If no subtable applied or no input was consumed for a given position, then apply default action (no adjustments and advance). IfsequenceIndexis non-negative, then apply subtables only when current position matchessequenceIndexin relation to the starting position. Furthermore, upon successful application atsequenceIndex, then discontinue processing the remaining- Parameters:
ps- positioning statesta- array of subtables to applysequenceIndex- if non negative, then apply subtables only at specified sequence index- Returns:
- true if a non-zero adjustment occurred
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position
public static final boolean position(GlyphSequence gs, String script, String language, String feature, int fontSize, GlyphPositioningSubtable[] sta, int[] widths, int[][] adjustments, ScriptContextTester sct) Apply positioning.- Parameters:
gs- input glyph sequencescript- taglanguage- tagfeature- tagfontSize- the font sizesta- subtable arraywidths- arrayadjustments- array (receives output adjustments)sct- script context tester- Returns:
- true if a non-zero adjustment occurred
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