ftc_cmap_family_compare( FTC_CMapFamily cfam, FTC_CMapQuery cquery ) { FT_Int result = 0; /* first, compare face id and type */ if ( cfam->desc.face_id != cquery->desc->face_id || cfam->desc.type != cquery->desc->type ) goto Exit; switch ( cfam->desc.type ) { case FTC_CMAP_BY_INDEX: result = ( cfam->desc.u.index == cquery->desc->u.index ); break; case FTC_CMAP_BY_ENCODING: result = ( cfam->desc.u.encoding == cquery->desc->u.encoding ); break; case FTC_CMAP_BY_ID: result = ( cfam->desc.u.id.platform == cquery->desc->u.id.platform && cfam->desc.u.id.encoding == cquery->desc->u.id.encoding ); break; default: ; } if ( result ) { /* when found, update the 'family' and 'hash' field of the query */ FTC_QUERY( cquery )->family = FTC_FAMILY( cfam ); FTC_QUERY( cquery )->hash = FTC_CMAP_HASH( cfam, cquery ); } Exit: return FT_BOOL( result ); }
FTC_CMapCache_Lookup( FTC_CMapCache cmap_cache, FTC_FaceID face_id, FT_Int cmap_index, FT_UInt32 char_code ) { FTC_Cache cache = FTC_CACHE( cmap_cache ); FTC_CMapQueryRec query; FTC_Node node; FT_Error error; FT_UInt gindex = 0; FT_Offset hash; FT_Int no_cmap_change = 0; if ( cmap_index < 0 ) { /* Treat a negative cmap index as a special value, meaning that you */ /* don't want to change the FT_Face's character map through this */ /* call. This can be useful if the face requester callback already */ /* sets the face's charmap to the appropriate value. */ no_cmap_change = 1; cmap_index = 0; } if ( !cache ) { FT_TRACE0(( "FTC_CMapCache_Lookup: bad arguments, returning 0\n" )); return 0; } query.face_id = face_id; query.cmap_index = (FT_UInt)cmap_index; query.char_code = char_code; hash = FTC_CMAP_HASH( face_id, (FT_UInt)cmap_index, char_code ); #if 1 FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, &query, node, error ); #else error = FTC_Cache_Lookup( cache, hash, &query, &node ); #endif if ( error ) goto Exit; FT_ASSERT( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first ) < FTC_CMAP_INDICES_MAX ); /* something rotten can happen with rogue clients */ if ( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first >= FTC_CMAP_INDICES_MAX ) ) return 0; /* XXX: should return appropriate error */ gindex = FTC_CMAP_NODE( node )->indices[char_code - FTC_CMAP_NODE( node )->first]; if ( gindex == FTC_CMAP_UNKNOWN ) { FT_Face face; gindex = 0; error = FTC_Manager_LookupFace( cache->manager, FTC_CMAP_NODE( node )->face_id, &face ); if ( error ) goto Exit; if ( (FT_UInt)cmap_index < (FT_UInt)face->num_charmaps ) { FT_CharMap old, cmap = NULL; old = face->charmap; cmap = face->charmaps[cmap_index]; if ( old != cmap && !no_cmap_change ) FT_Set_Charmap( face, cmap ); gindex = FT_Get_Char_Index( face, char_code ); if ( old != cmap && !no_cmap_change ) FT_Set_Charmap( face, old ); } FTC_CMAP_NODE( node )->indices[char_code - FTC_CMAP_NODE( node )->first] = (FT_UShort)gindex; } Exit: return gindex; }
FTC_CMapCache_Lookup( FTC_CMapCache cmap_cache, FTC_FaceID face_id, FT_Int cmap_index, FT_UInt32 char_code ) { FTC_Cache cache = FTC_CACHE( cmap_cache ); FTC_CMapQueryRec query; FTC_Node node; FT_Error error; FT_UInt gindex = 0; FT_PtrDist hash; FT_Int no_cmap_change = 0; if ( cmap_index < 0 ) { /* Treat a negative cmap index as a special value, meaning that you */ /* don't want to change the FT_Face's character map through this */ /* call. This can be useful if the face requester callback already */ /* sets the face's charmap to the appropriate value. */ no_cmap_change = 1; cmap_index = 0; } if ( !cache ) { FT_TRACE0(( "FTC_CMapCache_Lookup: bad arguments, returning 0\n" )); return 0; } #ifdef FT_CONFIG_OPTION_OLD_INTERNALS /* * If cmap_index is greater than the maximum number of cachable * charmaps, we assume the request is from a legacy rogue client * using old internal header. See include/config/ftoption.h. */ if ( cmap_index > FT_MAX_CHARMAP_CACHEABLE && !no_cmap_change ) { FTC_OldCMapDesc desc = (FTC_OldCMapDesc) face_id; char_code = (FT_UInt32)cmap_index; query.face_id = desc->face_id; switch ( desc->type ) { case FTC_OLD_CMAP_BY_INDEX: query.cmap_index = desc->u.index; query.char_code = (FT_UInt32)cmap_index; break; case FTC_OLD_CMAP_BY_ENCODING: { FT_Face face; error = FTC_Manager_LookupFace( cache->manager, desc->face_id, &face ); if ( error ) return 0; FT_Select_Charmap( face, desc->u.encoding ); return FT_Get_Char_Index( face, char_code ); } default: return 0; } } else #endif /* FT_CONFIG_OPTION_OLD_INTERNALS */ { query.face_id = face_id; query.cmap_index = (FT_UInt)cmap_index; query.char_code = char_code; } hash = FTC_CMAP_HASH( face_id, cmap_index, char_code ); #if 1 FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, &query, node, error ); #else error = FTC_Cache_Lookup( cache, hash, &query, &node ); #endif if ( error ) goto Exit; FT_ASSERT( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first ) < FTC_CMAP_INDICES_MAX ); /* something rotten can happen with rogue clients */ if ( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first >= FTC_CMAP_INDICES_MAX ) ) return 0; /* XXX: should return appropriate error */ gindex = FTC_CMAP_NODE( node )->indices[char_code - FTC_CMAP_NODE( node )->first]; if ( gindex == FTC_CMAP_UNKNOWN ) { FT_Face face; gindex = 0; error = FTC_Manager_LookupFace( cache->manager, FTC_CMAP_NODE( node )->face_id, &face ); if ( error ) goto Exit; #ifdef FT_MAX_CHARMAP_CACHEABLE /* something rotten can happen with rogue clients */ if ( cmap_index > FT_MAX_CHARMAP_CACHEABLE ) return 0; /* XXX: should return appropriate error */ #endif if ( (FT_UInt)cmap_index < (FT_UInt)face->num_charmaps ) { FT_CharMap old, cmap = NULL; old = face->charmap; cmap = face->charmaps[cmap_index]; if ( old != cmap && !no_cmap_change ) FT_Set_Charmap( face, cmap ); gindex = FT_Get_Char_Index( face, char_code ); if ( old != cmap && !no_cmap_change ) FT_Set_Charmap( face, old ); } FTC_CMAP_NODE( node )->indices[char_code - FTC_CMAP_NODE( node )->first] = (FT_UShort)gindex; } Exit: return gindex; }
ftc_cmap_family_init( FTC_CMapFamily cfam, FTC_CMapQuery cquery, FTC_Cache cache ) { FTC_Manager manager = cache->manager; FTC_CMapDesc desc = cquery->desc; FT_UInt32 hash = 0; FT_Error error; FT_Face face; /* setup charmap descriptor */ cfam->desc = *desc; /* let's see whether the rest is correct too */ error = FTC_Manager_Lookup_Face( manager, desc->face_id, &face ); if ( !error ) { FT_UInt count = face->num_charmaps; FT_UInt idx = count; FT_CharMap* cur = face->charmaps; switch ( desc->type ) { case FTC_CMAP_BY_INDEX: idx = desc->u.index; hash = idx * 33; break; case FTC_CMAP_BY_ENCODING: for ( idx = 0; idx < count; idx++, cur++ ) if ( cur[0]->encoding == desc->u.encoding ) break; hash = idx * 67; break; case FTC_CMAP_BY_ID: for ( idx = 0; idx < count; idx++, cur++ ) { if ( (FT_UInt)cur[0]->platform_id == desc->u.id.platform && (FT_UInt)cur[0]->encoding_id == desc->u.id.encoding ) { hash = ( ( desc->u.id.platform << 8 ) | desc->u.id.encoding ) * 7; break; } } break; default: ; } if ( idx >= count ) goto Bad_Descriptor; /* compute hash value, both in family and query */ cfam->index = idx; cfam->hash = hash ^ FTC_FACE_ID_HASH( desc->face_id ); FTC_QUERY( cquery )->hash = FTC_CMAP_HASH( cfam, cquery ); error = ftc_family_init( FTC_FAMILY( cfam ), FTC_QUERY( cquery ), cache ); } return error; Bad_Descriptor: FT_ERROR(( "ftp_cmap_family_init: invalid charmap descriptor\n" )); return FTC_Err_Invalid_Argument; }