jdk/src/share/native/sun/font/layout/ExtensionSubtables.cpp
author prr
Thu, 07 Mar 2013 10:02:20 -0800
changeset 16891 91e99bed64ae
parent 7486 6a36b1ebc620
child 18256 79d3f8278a38
permissions -rw-r--r--
8001031: Better font processing Reviewed-by: srl, vadim

/*
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 *
 *
 * (C) Copyright IBM Corp. 2002 - All Rights Reserved
 *
 */

#include "LETypes.h"
#include "OpenTypeTables.h"
#include "GlyphSubstitutionTables.h"
#include "LookupProcessor.h"
#include "ExtensionSubtables.h"
#include "GlyphIterator.h"
#include "LESwaps.h"

U_NAMESPACE_BEGIN

// read a 32-bit value that might only be 16-bit-aligned in memory
#define READ_LONG(code) (le_uint32)((SWAPW(*(le_uint16*)&code) << 16) + SWAPW(*(((le_uint16*)&code) + 1)))

// FIXME: should look at the format too... maybe have a sub-class for it?
le_uint32 ExtensionSubtable::process(const LookupProcessor *lookupProcessor, le_uint16 lookupType,
                                      GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const
{
    const LEReferenceTo<ExtensionSubtable> thisRef(lookupProcessor->getReference(), success); // create a reference to this

    if (LE_FAILURE(success)) {
        return 0;
    }

    le_uint16 elt = SWAPW(extensionLookupType);

    if (elt != lookupType) {
        le_uint32 extOffset = READ_LONG(extensionOffset);
        LEReferenceTo<LookupSubtable> subtable(thisRef, success, extOffset);

        if(LE_SUCCESS(success)) {
          return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);
        }
    }

    return 0;
}

U_NAMESPACE_END