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This section contains the declaration of functions to validate some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, trak, prop, lcar).
Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).
FT_EXPORT( FT_Error ) FT_TrueTypeGX_Validate( FT_Face face, FT_UInt validation_flags, FT_Bytes tables[FT_VALIDATE_GX_LENGTH], FT_UInt table_length );
Validate various TrueTypeGX tables to assure that all offsets and indices are valid. The idea is that a higher-level library that actually does the text layout can access those tables without error checking (which can be quite time consuming).
A handle to the input face.
A bit field that specifies the tables to be validated. See FT_VALIDATE_GXXXX for possible values.
The size of the ‘tables’ array. Normally, FT_VALIDATE_GX_LENGTH should be passed.
The array where all validated sfnt tables are stored. The array itself must be allocated by a client.
FreeType error code. 0 means success.
This function only works with TrueTypeGX fonts, returning an error otherwise.
After use, the application should deallocate the buffers pointed to by each ‘tables’ element, by calling FT_TrueTypeGX_Free. A NULL value indicates that the table either doesn't exist in the font, the application hasn't asked for validation, or the validator doesn't have the ability to validate the sfnt table.
FT_EXPORT( void ) FT_TrueTypeGX_Free( FT_Face face, FT_Bytes table );
Free the buffer allocated by TrueTypeGX validator.
The pointer to the buffer allocated by FT_TrueTypeGX_Validate.
This function must be used to free the buffer allocated by FT_TrueTypeGX_Validate only.
FT_EXPORT( FT_Error ) FT_ClassicKern_Validate( FT_Face face, FT_UInt validation_flags, FT_Bytes *ckern_table );
Validate classic (16-bit format) kern table to assure that the offsets and indices are valid. The idea is that a higher-level library that actually does the text layout can access those tables without error checking (which can be quite time consuming).
The ‘kern’ table validator in FT_TrueTypeGX_Validate deals with both the new 32-bit format and the classic 16-bit format, while FT_ClassicKern_Validate only supports the classic 16-bit format.
A bit field that specifies the dialect to be validated. See FT_VALIDATE_CKERNXXX for possible values.
A pointer to the kern table.
After use, the application should deallocate the buffers pointed to by ‘ckern_table’, by calling FT_ClassicKern_Free. A NULL value indicates that the table doesn't exist in the font.
FT_EXPORT( void ) FT_ClassicKern_Free( FT_Face face, FT_Bytes table );
Free the buffer allocated by classic Kern validator.
The pointer to the buffer that is allocated by FT_ClassicKern_Validate.
This function must be used to free the buffer allocated by FT_ClassicKern_Validate only.
#define FT_VALIDATE_GX_LENGTH ( FT_VALIDATE_GX_LAST_INDEX + 1 )
The number of tables checked in this module. Use it as a parameter for the ‘table-length’ argument of function FT_TrueTypeGX_Validate.
#define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat ) #define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort ) #define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx ) #define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln ) #define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just ) #define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern ) #define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd ) #define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak ) #define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop ) #define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar ) #define FT_VALIDATE_GX ( FT_VALIDATE_feat | \ FT_VALIDATE_mort | \ FT_VALIDATE_morx | \ FT_VALIDATE_bsln | \ FT_VALIDATE_just | \ FT_VALIDATE_kern | \ FT_VALIDATE_opbd | \ FT_VALIDATE_trak | \ FT_VALIDATE_prop | \ FT_VALIDATE_lcar )
A list of bit-field constants used with FT_TrueTypeGX_Validate to indicate which TrueTypeGX/AAT Type tables should be validated.
Validate ‘feat’ table.
Validate ‘mort’ table.
Validate ‘morx’ table.
Validate ‘bsln’ table.
Validate ‘just’ table.
Validate ‘kern’ table.
Validate ‘opbd’ table.
Validate ‘trak’ table.
Validate ‘prop’ table.
Validate ‘lcar’ table.
Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, trak, prop and lcar).
#define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 ) #define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 ) #define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
A list of bit-field constants used with FT_ClassicKern_Validate to indicate the classic kern dialect or dialects. If the selected type doesn't fit, FT_ClassicKern_Validate regards the table as invalid.
Handle the ‘kern’ table as a classic Microsoft kern table.
Handle the ‘kern’ table as a classic Apple kern table.
Handle the ‘kern’ as either classic Apple or Microsoft kern table.