diff options
Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp b/Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp new file mode 100644 index 00000000000..ffe65b320fe --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp @@ -0,0 +1,52 @@ +/* + * + * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved + * + */ + +#include "LETypes.h" +#include "LEGlyphFilter.h" +#include "OpenTypeTables.h" +#include "GlyphSubstitutionTables.h" +#include "AlternateSubstSubtables.h" +#include "GlyphIterator.h" +#include "LESwaps.h" + +U_NAMESPACE_BEGIN + +le_uint32 AlternateSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const +{ + // NOTE: For now, we'll just pick the first alternative... + LEGlyphID glyph = glyphIterator->getCurrGlyphID(); + le_int32 coverageIndex = getGlyphCoverage(glyph); + + if (coverageIndex >= 0) { + le_uint16 altSetCount = SWAPW(alternateSetCount); + + if (coverageIndex < altSetCount) { + Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]); + const AlternateSetTable *alternateSetTable = + (const AlternateSetTable *) ((char *) this + alternateSetTableOffset); + le_int32 altIndex = glyphIterator->getFeatureParam(); + + if (altIndex < SWAPW(alternateSetTable->glyphCount)) { + TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[altIndex]); + + if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) { + glyphIterator->setCurrGlyphID(alternate); + } + + return 1; + } + + // feature param was out of range for the glyph + return 0; + } + + // XXXX If we get here, the table's mal-formed... + } + + return 0; +} + +U_NAMESPACE_END |