--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/MarkToBasePosnSubtables.cpp	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,99 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "LEFontInstance.h"
+#include "OpenTypeTables.h"
+#include "AnchorTables.h"
+#include "MarkArrays.h"
+#include "GlyphPositioningTables.h"
+#include "AttachmentPosnSubtables.h"
+#include "MarkToBasePosnSubtables.h"
+#include "GlyphIterator.h"
+#include "LESwaps.h"
+
+U_NAMESPACE_BEGIN
+
+LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const
+{
+    if (glyphIterator->prev()) {
+        return glyphIterator->getCurrGlyphID();
+    }
+
+    return 0xFFFF;
+}
+
+le_int32 MarkToBasePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
+{
+    LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
+    le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
+
+    if (markCoverage < 0) {
+        // markGlyph isn't a covered mark glyph
+        return 0;
+    }
+
+    LEPoint markAnchor;
+    const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
+    le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
+    le_uint16 mcCount = SWAPW(classCount);
+
+    if (markClass < 0 || markClass >= mcCount) {
+        // markGlyph isn't in the mark array or its
+        // mark class is too big. The table is mal-formed!
+        return 0;
+    }
+
+    // FIXME: We probably don't want to find a base glyph before a previous ligature... 
+    GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/));
+    LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
+    le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph);
+    const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
+    le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);
+
+    if (baseCoverage < 0 || baseCoverage >= baseCount) {
+        // The base glyph isn't covered, or the coverage
+        // index is too big. The latter means that the
+        // table is mal-formed...
+        return 0;
+    }
+
+    const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
+    Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
+    const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
+    LEPoint baseAnchor, markAdvance, pixels;
+
+    if (anchorTableOffset == 0) {
+        // this means the table is mal-formed...
+        glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
+        return 0;
+    }
+
+    anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);
+
+    fontInstance->getGlyphAdvance(markGlyph, pixels);
+    fontInstance->pixelsToUnits(pixels, markAdvance);
+
+    float anchorDiffX = baseAnchor.fX - markAnchor.fX;
+    float anchorDiffY = baseAnchor.fY - markAnchor.fY;
+
+    glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
+
+    if (glyphIterator->isRightToLeft()) {
+        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
+    } else {
+        LEPoint baseAdvance;
+
+        fontInstance->getGlyphAdvance(baseGlyph, pixels);
+        fontInstance->pixelsToUnits(pixels, baseAdvance);
+
+        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.fY, -markAdvance.fX, -markAdvance.fY);
+    }
+
+    return 1;
+}
+
+U_NAMESPACE_END