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-rw-r--r--Build/source/libs/icu/icu-xetex/layout/AlternateSubstSubtables.cpp52
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