ftxgsub.h

qt-x11-opensource-src-4.1.4.tar.gz源码

  };

  typedef struct TTO_ContextSubstFormat2_  TTO_ContextSubstFormat2;


  struct  TTO_ContextSubstFormat3_
  {
    FT_UShort               GlyphCount; /* number of input glyphs        */
    FT_UShort               SubstCount; /* number of SubstLookupRecords  */
    TTO_Coverage*           Coverage;   /* array of Coverage tables      */
    TTO_SubstLookupRecord*  SubstLookupRecord;
                                        /* array of substitution lookups */
  };

  typedef struct TTO_ContextSubstFormat3_  TTO_ContextSubstFormat3;


  struct  TTO_ContextSubst_
  {
    FT_UShort  SubstFormat;             /* 1, 2, or 3 */

    union
    {
      TTO_ContextSubstFormat1  csf1;
      TTO_ContextSubstFormat2  csf2;
      TTO_ContextSubstFormat3  csf3;
    } csf;
  };

  typedef struct TTO_ContextSubst_  TTO_ContextSubst;


  /* LookupType 6 */

  struct  TTO_ChainSubRule_
  {
    FT_UShort               BacktrackGlyphCount;
                                        /* total number of backtrack glyphs */
    FT_UShort*              Backtrack;  /* array of backtrack glyph IDs     */
    FT_UShort               InputGlyphCount;
                                        /* total number of input glyphs     */
    FT_UShort*              Input;      /* array of input glyph IDs         */
    FT_UShort               LookaheadGlyphCount;
                                        /* total number of lookahead glyphs */
    FT_UShort*              Lookahead;  /* array of lookahead glyph IDs     */
    FT_UShort               SubstCount; /* number of SubstLookupRecords     */
    TTO_SubstLookupRecord*  SubstLookupRecord;
                                        /* array of SubstLookupRecords      */
  };

  typedef struct TTO_ChainSubRule_  TTO_ChainSubRule;


  struct  TTO_ChainSubRuleSet_
  {
    FT_UShort          ChainSubRuleCount;
                                        /* number of ChainSubRule tables */
    TTO_ChainSubRule*  ChainSubRule;    /* array of ChainSubRule tables  */
  };

  typedef struct TTO_ChainSubRuleSet_  TTO_ChainSubRuleSet;


  struct  TTO_ChainContextSubstFormat1_
  {
    TTO_Coverage          Coverage;     /* Coverage table                   */
    FT_UShort             ChainSubRuleSetCount;
                                        /* number of ChainSubRuleSet tables */
    TTO_ChainSubRuleSet*  ChainSubRuleSet;
                                        /* array of ChainSubRuleSet tables  */
  };

  typedef struct TTO_ChainContextSubstFormat1_  TTO_ChainContextSubstFormat1;


  struct  TTO_ChainSubClassRule_
  {
    FT_UShort               BacktrackGlyphCount;
                                        /* total number of backtrack
                                           classes                         */
    FT_UShort*              Backtrack;  /* array of backtrack classes      */
    FT_UShort               InputGlyphCount;
                                        /* total number of context classes */
    FT_UShort*              Input;      /* array of context classes        */
    FT_UShort               LookaheadGlyphCount;
                                        /* total number of lookahead
                                           classes                         */
    FT_UShort*              Lookahead;  /* array of lookahead classes      */
    FT_UShort               SubstCount; /* number of SubstLookupRecords    */
    TTO_SubstLookupRecord*  SubstLookupRecord;
                                        /* array of substitution lookups   */
  };

  typedef struct TTO_ChainSubClassRule_  TTO_ChainSubClassRule;


  struct  TTO_ChainSubClassSet_
  {
    FT_UShort               ChainSubClassRuleCount;
                                        /* number of ChainSubClassRule
                                           tables                      */
    TTO_ChainSubClassRule*  ChainSubClassRule;
                                        /* array of ChainSubClassRule
                                           tables                      */
  };

  typedef struct TTO_ChainSubClassSet_  TTO_ChainSubClassSet;


  /* The `MaxXXXLength' fields are not defined in the TTO specification
     but simplifies the implementation of this format.  It holds the
     maximal context length used in the specific context rules.         */

  struct  TTO_ChainContextSubstFormat2_
  {
    TTO_Coverage           Coverage;    /* Coverage table             */

    FT_UShort              MaxBacktrackLength;
                                        /* maximal backtrack length   */
    TTO_ClassDefinition    BacktrackClassDef;
                                        /* BacktrackClassDef table    */
    FT_UShort              MaxInputLength;
                                        /* maximal input length       */
    TTO_ClassDefinition    InputClassDef;
                                        /* InputClassDef table        */
    FT_UShort              MaxLookaheadLength;
                                        /* maximal lookahead length   */
    TTO_ClassDefinition    LookaheadClassDef;
                                        /* LookaheadClassDef table    */

    FT_UShort              ChainSubClassSetCount;
                                        /* number of ChainSubClassSet
                                           tables                     */
    TTO_ChainSubClassSet*  ChainSubClassSet;
                                        /* array of ChainSubClassSet
                                           tables                     */
  };

  typedef struct TTO_ChainContextSubstFormat2_  TTO_ChainContextSubstFormat2;


  struct  TTO_ChainContextSubstFormat3_
  {
    FT_UShort               BacktrackGlyphCount;
                                        /* number of backtrack glyphs    */
    TTO_Coverage*           BacktrackCoverage;
                                        /* array of backtrack Coverage
                                           tables                        */
    FT_UShort               InputGlyphCount;
                                        /* number of input glyphs        */
    TTO_Coverage*           InputCoverage;
                                        /* array of input coverage
                                           tables                        */
    FT_UShort               LookaheadGlyphCount;
                                        /* number of lookahead glyphs    */
    TTO_Coverage*           LookaheadCoverage;
                                        /* array of lookahead coverage
                                           tables                        */
    FT_UShort               SubstCount; /* number of SubstLookupRecords  */
    TTO_SubstLookupRecord*  SubstLookupRecord;
                                        /* array of substitution lookups */
  };

  typedef struct TTO_ChainContextSubstFormat3_  TTO_ChainContextSubstFormat3;


  struct  TTO_ChainContextSubst_
  {
    FT_UShort  SubstFormat;             /* 1, 2, or 3 */

    union
    {
      TTO_ChainContextSubstFormat1  ccsf1;
      TTO_ChainContextSubstFormat2  ccsf2;
      TTO_ChainContextSubstFormat3  ccsf3;
    } ccsf;
  };

  typedef struct TTO_ChainContextSubst_  TTO_ChainContextSubst;


  union  TTO_GSUB_SubTable_
  {
    TTO_SingleSubst        single;
    TTO_MultipleSubst      multiple;
    TTO_AlternateSubst     alternate;
    TTO_LigatureSubst      ligature;
    TTO_ContextSubst       context;
    TTO_ChainContextSubst  chain;
  };

  typedef union TTO_GSUB_SubTable_  TTO_GSUB_SubTable;


  /* A simple string object.  It can both `send' and `receive' data.
     In case of sending, `length' and `pos' will be used.  In case of
     receiving, `pos' points to the first free slot, and `allocated'
     specifies the amount of allocated memory (and the `length' field
     will be ignored).  The routine TT_Add_String() will increase the
     amount of memory if necessary.  After end of receive, `length'
     should be set to the value of `pos', and `pos' will be set to zero.

     `properties' (which is treated as a bit field) gives the glyph's
     properties: If a certain bit is set for a glyph, the feature which
     has the same bit set in its property value is applied.

     `components' is an internal array which tracks components of
     ligatures.  We need this for MarkToLigature Attachment Positioning
     Subtables (in GPOS) together with `ligIDs' (which is used to mark
     ligatures and the skipped glyphs during a ligature lookup).
     `max_ligID' is increased after a successful ligature lookup.

     NEVER modify any elements of the structure!  You should rather copy
     its contents if necessary.

     TT_Add_String() will also handle allocation; you should use
     free() in case you want to destroy the arrays in the object. */


  /* finally, the GSUB API */

  /*  EXPORT_DEF
      TT_Error  TT_Init_GSUB_Extension( TT_Engine  engine ); */

  EXPORT_DEF
  FT_Error  TT_Load_GSUB_Table( FT_Face          face,
                                TTO_GSUBHeader** gsub,
                                TTO_GDEFHeader*  gdef );

  EXPORT_DEF
  FT_Error  TT_Done_GSUB_Table( TTO_GSUBHeader*  gsub );

  EXPORT_DEF
  FT_Error  TT_GSUB_Select_Script( TTO_GSUBHeader*  gsub,
                                   FT_ULong         script_tag,
                                   FT_UShort*       script_index );
  EXPORT_DEF
  FT_Error  TT_GSUB_Select_Language( TTO_GSUBHeader*  gsub,
                                     FT_ULong         language_tag,
                                     FT_UShort        script_index,
                                     FT_UShort*       language_index,
                                     FT_UShort*       req_feature_index );
  EXPORT_DEF
  FT_Error  TT_GSUB_Select_Feature( TTO_GSUBHeader*  gsub,
                                    FT_ULong         feature_tag,
                                    FT_UShort        script_index,
                                    FT_UShort        language_index,
                                    FT_UShort*       feature_index );

  EXPORT_DEF
  FT_Error  TT_GSUB_Query_Scripts( TTO_GSUBHeader*  gsub,
                                   FT_ULong**       script_tag_list );
  EXPORT_DEF
  FT_Error  TT_GSUB_Query_Languages( TTO_GSUBHeader*  gsub,
                                     FT_UShort        script_index,
                                     FT_ULong**       language_tag_list );
  EXPORT_DEF
  FT_Error  TT_GSUB_Query_Features( TTO_GSUBHeader*  gsub,
                                    FT_UShort        script_index,
                                    FT_UShort        language_index,
                                    FT_ULong**       feature_tag_list );

  EXPORT_DEF
  FT_Error  TT_GSUB_Add_Feature( TTO_GSUBHeader*  gsub,
                                 FT_UShort        feature_index,
                                 FT_UInt          property );
  EXPORT_DEF
  FT_Error  TT_GSUB_Clear_Features( TTO_GSUBHeader*  gsub );

  EXPORT_DEF
  FT_Error  TT_GSUB_Register_Alternate_Function( TTO_GSUBHeader*  gsub,
                                                 TTO_AltFunction  altfunc,
                                                 void*            data );
  
  EXPORT_DEF
  FT_Error  TT_GSUB_Apply_String( TTO_GSUBHeader*   gsub,
				  OTL_Buffer        buffer );


#ifdef __cplusplus
}
#endif

#endif /* FTXGSUB_H */


/* END */