--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/LigatureSubstProc.cpp	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,117 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "MorphTables.h"
+#include "StateTables.h"
+#include "MorphStateTables.h"
+#include "SubtableProcessor.h"
+#include "StateTableProcessor.h"
+#include "LigatureSubstProc.h"
+#include "LEGlyphStorage.h"
+#include "LESwaps.h"
+
+U_NAMESPACE_BEGIN
+
+#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
+#define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))
+#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor)
+
+LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)
+  : StateTableProcessor(morphSubtableHeader)
+{
+    ligatureSubstitutionHeader = (const LigatureSubstitutionHeader *) morphSubtableHeader;
+    ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset);
+    componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset);
+    ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset);
+
+    entryTable = (const LigatureSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
+}
+
+LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor()
+{
+}
+
+void LigatureSubstitutionProcessor::beginStateTable()
+{
+    m = -1;
+}
+
+ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
+{
+    const LigatureSubstitutionStateEntry *entry = &entryTable[index];
+    ByteOffset newState = SWAPW(entry->newStateOffset);
+    le_int16 flags = SWAPW(entry->flags);
+
+    if (flags & lsfSetComponent) {
+        if (++m >= nComponents) {
+            m = 0;
+        }
+
+        componentStack[m] = currGlyph;
+    }
+
+    ByteOffset actionOffset = flags & lsfActionOffsetMask;
+
+    if (actionOffset != 0) {
+        const LigatureActionEntry *ap = (const LigatureActionEntry *) ((char *) &ligatureSubstitutionHeader->stHeader + actionOffset);
+        LigatureActionEntry action;
+        le_int32 offset, i = 0;
+        le_int32 stack[nComponents];
+        le_int16 mm = -1;
+
+        do {
+            le_uint32 componentGlyph = componentStack[m--];
+
+            action = SWAPL(*ap++);
+
+            if (m < 0) {
+                m = nComponents - 1;
+            }
+
+            offset = action & lafComponentOffsetMask;
+            if (offset != 0) {
+                const le_int16 *offsetTable = (const le_int16 *)((char *) &ligatureSubstitutionHeader->stHeader + 2 * SignExtend(offset, lafComponentOffsetMask));
+
+                i += SWAPW(offsetTable[LE_GET_GLYPH(glyphStorage[componentGlyph])]);
+
+                if (action & (lafLast | lafStore))  {
+                    const TTGlyphID *ligatureOffset = (const TTGlyphID *) ((char *) &ligatureSubstitutionHeader->stHeader + i);
+                    TTGlyphID ligatureGlyph = SWAPW(*ligatureOffset);
+
+                    glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph);
+                    stack[++mm] = componentGlyph;
+                    i = 0;
+                } else {
+                    glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF);
+                }
+            }
+        } while (!(action & lafLast));
+
+        while (mm >= 0) {
+            if (++m >= nComponents) {
+                m = 0;
+            }
+
+            componentStack[m] = stack[mm--];
+        }
+    }
+
+    if (!(flags & lsfDontAdvance)) {
+        // should handle reverse too!
+        currGlyph += 1;
+    }
+
+    return newState;
+}
+
+void LigatureSubstitutionProcessor::endStateTable()
+{
+}
+
+U_NAMESPACE_END