1 /*

     2  *

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

     4  *

     5  */

     6 

     7 #include "LETypes.h"

     8 #include "LEGlyphFilter.h"

     9 #include "OpenTypeTables.h"

    10 #include "GlyphSubstitutionTables.h"

    11 #include "AlternateSubstSubtables.h"

    12 #include "GlyphIterator.h"

    13 #include "LESwaps.h"

    14 

    15 U_NAMESPACE_BEGIN

    16 

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

    18 {

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

    20     LEGlyphID glyph = glyphIterator->getCurrGlyphID();

    21     le_int32 coverageIndex = getGlyphCoverage(glyph);

    22 

    23     if (coverageIndex >= 0) {

    24         le_uint16 altSetCount = SWAPW(alternateSetCount);

    25 

    26         if (coverageIndex < altSetCount) {

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

    28             const AlternateSetTable *alternateSetTable =

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

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

    31 

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

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

    34             }

    35             

    36             return 1;

    37         }

    38 

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

    40     }

    41 

    42     return 0;

    43 }

    44 

    45 U_NAMESPACE_END