sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEFontInstance.h"
sl@0: #include "OpenTypeTables.h"
sl@0: #include "AnchorTables.h"
sl@0: #include "MarkArrays.h"
sl@0: #include "GlyphPositioningTables.h"
sl@0: #include "AttachmentPosnSubtables.h"
sl@0: #include "MarkToMarkPosnSubtables.h"
sl@0: #include "GlyphIterator.h"
sl@0: #include "LESwaps.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator) const
sl@0: {
sl@0:     if (glyphIterator->findMark2Glyph()) {
sl@0:         return glyphIterator->getCurrGlyphID();
sl@0:     }
sl@0: 
sl@0:     return 0xFFFF;
sl@0: }
sl@0: 
sl@0: le_int32 MarkToMarkPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
sl@0: {
sl@0:     LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
sl@0:     le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
sl@0: 
sl@0:     if (markCoverage < 0) {
sl@0:         // markGlyph isn't a covered mark glyph
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     LEPoint markAnchor;
sl@0:     const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
sl@0:     le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
sl@0:     le_uint16 mcCount = SWAPW(classCount);
sl@0: 
sl@0:     if (markClass < 0 || markClass >= mcCount) {
sl@0:         // markGlyph isn't in the mark array or its
sl@0:         // mark class is too big. The table is mal-formed!
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     GlyphIterator mark2Iterator(*glyphIterator);
sl@0:     LEGlyphID mark2Glyph = findMark2Glyph(&mark2Iterator);
sl@0:     le_int32 mark2Coverage = getBaseCoverage((LEGlyphID) mark2Glyph);
sl@0:     const Mark2Array *mark2Array = (const Mark2Array *) ((char *) this + SWAPW(baseArrayOffset));
sl@0:     le_uint16 mark2Count = SWAPW(mark2Array->mark2RecordCount);
sl@0: 
sl@0:     if (mark2Coverage < 0 || mark2Coverage >= mark2Count) {
sl@0:         // The mark2 glyph isn't covered, or the coverage
sl@0:         // index is too big. The latter means that the
sl@0:         // table is mal-formed...
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     const Mark2Record *mark2Record = &mark2Array->mark2RecordArray[mark2Coverage * mcCount];
sl@0:     Offset anchorTableOffset = SWAPW(mark2Record->mark2AnchorTableOffsetArray[markClass]);
sl@0:     const AnchorTable *anchorTable = (const AnchorTable *) ((char *) mark2Array + anchorTableOffset);
sl@0:     LEPoint mark2Anchor, markAdvance, pixels;
sl@0: 
sl@0:     anchorTable->getAnchor(mark2Glyph, fontInstance, mark2Anchor);
sl@0: 
sl@0:     fontInstance->getGlyphAdvance(markGlyph, pixels);
sl@0:     fontInstance->pixelsToUnits(pixels, markAdvance);
sl@0: 
sl@0:     float anchorDiffX = mark2Anchor.fX - markAnchor.fX;
sl@0:     float anchorDiffY = mark2Anchor.fY - markAnchor.fY;
sl@0: 
sl@0:     glyphIterator->setCurrGlyphBaseOffset(mark2Iterator.getCurrStreamPosition());
sl@0: 
sl@0:     if (glyphIterator->isRightToLeft()) {
sl@0:         glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
sl@0:     } else {
sl@0:         LEPoint mark2Advance;
sl@0: 
sl@0:         fontInstance->getGlyphAdvance(mark2Glyph, pixels);
sl@0:         fontInstance->pixelsToUnits(pixels, mark2Advance);
sl@0: 
sl@0:         glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - mark2Advance.fX, anchorDiffY - mark2Advance.fY, -markAdvance.fX, -markAdvance.fY);
sl@0:     }
sl@0: 
sl@0:     return 1;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END