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.  Sun designates this

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

     8  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    21  * CA 95054 USA or visit www.sun.com if you need additional information or

    22  * have any questions.

    23  *

    24  */

    25 

    26 /*

    27  *

    28  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved

    29  *

    30  */

    31 

    32 #include "LETypes.h"

    33 #include "LEGlyphFilter.h"

    34 #include "OpenTypeTables.h"

    35 #include "GlyphSubstitutionTables.h"

    36 #include "AlternateSubstSubtables.h"

    37 #include "GlyphIterator.h"

    38 #include "LESwaps.h"

    39 

    40 le_uint32 AlternateSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const

    41 {

    42     // NOTE: For now, we'll just pick the first alternative...

    43     LEGlyphID glyph = glyphIterator->getCurrGlyphID();

    44     le_int32 coverageIndex = getGlyphCoverage(glyph);

    45 

    46     if (coverageIndex >= 0) {

    47         le_uint16 altSetCount = SWAPW(alternateSetCount);

    48 

    49         if (coverageIndex < altSetCount) {

    50             Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]);

    51             const AlternateSetTable *alternateSetTable =

    52                 (const AlternateSetTable *) ((char *) this + alternateSetTableOffset);

    53             TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);

    54 

    55             if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) {

    56                 glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));

    57             }

    58 

    59             return 1;

    60         }

    61 

    62         // XXXX If we get here, the table's mal-formed...

    63     }

    64 

    65     return 0;

    66 }