/*

  *

  * (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