--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/MultipleSubstSubtables.cpp	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,96 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "LEGlyphFilter.h"
+#include "OpenTypeTables.h"
+#include "GlyphSubstitutionTables.h"
+#include "MultipleSubstSubtables.h"
+#include "GlyphIterator.h"
+#include "LESwaps.h"
+
+U_NAMESPACE_BEGIN
+
+le_uint32 MultipleSubstitutionSubtable::process(GlyphIterator *glyphIterator, LEErrorCode& success,
+    const LEGlyphFilter *filter) const
+{
+    if (LE_FAILURE(success)) {
+        return 0;
+    }
+
+    LEGlyphID glyph = glyphIterator->getCurrGlyphID();
+
+    // If there's a filter, we only want to do the
+    // substitution if the *input* glyphs doesn't
+    // exist.
+    //
+    // FIXME: is this always the right thing to do?
+    // FIXME: should this only be done for a non-zero
+    //        glyphCount?
+    if (filter != NULL && filter->accept(glyph)) {
+        return 0;
+    }
+
+    le_int32 coverageIndex = getGlyphCoverage(glyph);
+    le_uint16 seqCount = SWAPW(sequenceCount);
+
+    if (coverageIndex >= 0 && coverageIndex < seqCount) {
+        Offset sequenceTableOffset = SWAPW(sequenceTableOffsetArray[coverageIndex]);
+        const SequenceTable *sequenceTable = (const SequenceTable *) ((char *) this + sequenceTableOffset);
+        le_uint16 glyphCount = SWAPW(sequenceTable->glyphCount);
+
+        if (glyphCount == 0) {
+            glyphIterator->setCurrGlyphID(0xFFFF);
+            return 1;
+        } else if (glyphCount == 1) {
+            TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[0]);
+
+            if (filter != NULL && ! filter->accept(LE_SET_GLYPH(glyph, substitute))) {
+                return 0;
+            }
+
+            glyphIterator->setCurrGlyphID(substitute);
+            return 1;
+        } else {
+            // If there's a filter, make sure all of the output glyphs
+            // exist.
+            if (filter != NULL) {
+                for (le_int32 i = 0; i < glyphCount; i += 1) {
+                    TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
+
+                    if (! filter->accept(substitute)) {
+                        return 0;
+                    }
+                }
+            }
+
+            LEGlyphID *newGlyphs = glyphIterator->insertGlyphs(glyphCount, success);
+            if (LE_FAILURE(success)) {
+                return 0;
+            }
+
+            le_int32 insert = 0, direction = 1;
+
+            if (glyphIterator->isRightToLeft()) {
+                insert = glyphCount - 1;
+                direction = -1;
+            }
+
+            for (le_int32 i = 0; i < glyphCount; i += 1) {
+                TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
+
+                newGlyphs[insert] = LE_SET_GLYPH(glyph, substitute);
+                insert += direction;
+            }
+
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+U_NAMESPACE_END