1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.  Oracle designates this

     7  * particular file as subject to the "Classpath" exception as provided

     8  * by Oracle in the LICENSE file that accompanied this code.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    25 

    26 /*

    27  *

    28  *

    29  * (C) Copyright IBM Corp. 2002 - All Rights Reserved

    30  *

    31  */

    32 

    33 #include "LETypes.h"

    34 #include "OpenTypeTables.h"

    35 #include "GlyphSubstitutionTables.h"

    36 #include "LookupProcessor.h"

    37 #include "ExtensionSubtables.h"

    38 #include "GlyphIterator.h"

    39 #include "LESwaps.h"

    40 

    41 U_NAMESPACE_BEGIN

    42 

    43 // read a 32-bit value that might only be 16-bit-aligned in memory

    44 #define READ_LONG(code) (le_uint32)((SWAPW(*(le_uint16*)&code) << 16) + SWAPW(*(((le_uint16*)&code) + 1)))

    45 

    46 // FIXME: should look at the format too... maybe have a sub-class for it?

    47 le_uint32 ExtensionSubtable::process(const LEReferenceTo<ExtensionSubtable> &thisRef,

    48                                      const LookupProcessor *lookupProcessor, le_uint16 lookupType,

    49                                       GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const

    50 {

    51     if (LE_FAILURE(success)) {

    52         return 0;

    53     }

    54 

    55     le_uint16 elt = SWAPW(extensionLookupType);

    56 

    57     if (elt != lookupType) {

    58         le_uint32 extOffset = READ_LONG(extensionOffset);

    59         LEReferenceTo<LookupSubtable> subtable(thisRef, success,  extOffset);

    60 

    61         if(LE_SUCCESS(success)) {

    62           return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);

    63         }

    64     }

    65 

    66     return 0;

    67 }

    68 

    69 U_NAMESPACE_END