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;
}
