Package org.apache.fop.complexscripts.fonts

Class GlyphSubtable

java.lang.Object
org.apache.fop.complexscripts.fonts.GlyphSubtable
All Implemented Interfaces:
Comparable
Direct Known Subclasses:
GlyphDefinitionSubtable, GlyphPositioningSubtable, GlyphSubstitutionSubtable
public abstract class GlyphSubtable extends Object implements Comparable

The GlyphSubtable implements an abstract glyph subtable that encapsulates identification, type, format, and coverage information.

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

  • Field Details

    • LF_RIGHT_TO_LEFT

      public static final int LF_RIGHT_TO_LEFT
      lookup flag - right to left
      See Also:

    • LF_IGNORE_BASE

      public static final int LF_IGNORE_BASE
      lookup flag - ignore base glyphs
      See Also:

    • LF_IGNORE_LIGATURE

      public static final int LF_IGNORE_LIGATURE
      lookup flag - ignore ligatures
      See Also:

    • LF_IGNORE_MARK

      public static final int LF_IGNORE_MARK
      lookup flag - ignore marks
      See Also:

    • LF_USE_MARK_FILTERING_SET

      public static final int LF_USE_MARK_FILTERING_SET
      lookup flag - use mark filtering set
      See Also:

    • LF_RESERVED

      public static final int LF_RESERVED
      lookup flag - reserved
      See Also:

    • LF_MARK_ATTACHMENT_TYPE

      public static final int LF_MARK_ATTACHMENT_TYPE
      lookup flag - mark attachment type
      See Also:

    • LF_INTERNAL_USE_REVERSE_SCAN

      public static final int LF_INTERNAL_USE_REVERSE_SCAN
      internal flag - use reverse scan
      See Also:

  • Constructor Details

    • GlyphSubtable

      protected GlyphSubtable(String lookupId, int sequence, int flags, int format, GlyphMappingTable mapping)
      Instantiate this glyph subtable.
      Parameters:
      lookupId - lookup identifier, having form of "lu%d" where %d is index of lookup in lookup list
      sequence - subtable sequence (within lookup), starting with zero
      flags - subtable flags
      format - subtable format
      mapping - subtable mapping table

  • Method Details

    • getLookupId

      public String getLookupId()
      Returns:
      this subtable's lookup identifer

    • getTableType

      public abstract int getTableType()
      Returns:
      this subtable's table type

    • getType

      public abstract int getType()
      Returns:
      this subtable's type

    • getTypeName

      public abstract String getTypeName()
      Returns:
      this subtable's type name

    • isCompatible

      public abstract boolean isCompatible(GlyphSubtable subtable)
      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.
      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

    • usesReverseScan

      public abstract boolean usesReverseScan()
      Returns:
      true if subtable uses reverse scanning of glyph sequence, meaning from the last glyph in a glyph sequence to the first glyph

    • getSequence

      public int getSequence()
      Returns:
      this subtable's sequence (index) within lookup

    • getFlags

      public int getFlags()
      Returns:
      this subtable's flags

    • getFormat

      public int getFormat()
      Returns:
      this subtable's format

    • getGDEF

      public GlyphDefinitionTable getGDEF()
      Returns:
      this subtable's governing glyph definition table or null if none available

    • getCoverage

      public GlyphCoverageMapping getCoverage()
      Returns:
      this subtable's coverage mapping or null if mapping is not a coverage mapping

    • getClasses

      public GlyphClassMapping getClasses()
      Returns:
      this subtable's class mapping or null if mapping is not a class mapping

    • getEntries

      public abstract List getEntries()
      Returns:
      this subtable's lookup entries

    • getTable

      public GlyphTable getTable()
      Returns:
      this subtable's parent table (or null if undefined)

    • setTable

      public void setTable(GlyphTable table) throws IllegalStateException
      Establish a weak reference from this subtable to its parent table. If table parameter is specified as null, then clear and remove weak reference.
      Parameters:
      table - the table or null
      Throws:
      IllegalStateException - if table is already set to non-null

    • resolveLookupReferences

      public void resolveLookupReferences(Map<String,GlyphTable.LookupTable> lookupTables)
      Resolve references to lookup tables, e.g., in RuleLookup, to the lookup tables themselves.
      Parameters:
      lookupTables - map from lookup table identifers, e.g. "lu4", to lookup tables

    • getCoverageIndex

      public int getCoverageIndex(int gid)
      Map glyph id to coverage index.
      Parameters:
      gid - glyph id
      Returns:
      the corresponding coverage index of the specified glyph id

    • getCoverageSize

      public int getCoverageSize()
      Map glyph id to coverage index.
      Returns:
      the corresponding coverage index of the specified glyph id

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class Object
      Returns:
      true if the lookup identifier and the sequence number of the specified subtable is the same as the lookup identifier and sequence number of this subtable

    • compareTo

      public int compareTo(Object o)
      Specified by:
      compareTo in interface Comparable
      Returns:
      the result of comparing the lookup identifier and the sequence number of the specified subtable with the lookup identifier and sequence number of this subtable

    • usesReverseScan

      public static boolean usesReverseScan(GlyphSubtable[] subtables)
      Determine if any of the specified subtables uses reverse scanning.
      Parameters:
      subtables - array of glyph subtables
      Returns:
      true if any of the specified subtables uses reverse scanning.

    • getFlags

      public static int getFlags(GlyphSubtable[] subtables) throws IllegalStateException
      Determine consistent flags for a set of subtables.
      Parameters:
      subtables - array of glyph subtables
      Returns:
      consistent flags
      Throws:
      IllegalStateException - if inconsistent flags