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/*
*
* (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 "MarkToMarkPosnSubtables.h"
#include "GlyphIterator.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator) const
{
if (glyphIterator->findMark2Glyph()) {
return glyphIterator->getCurrGlyphID();
}
return 0xFFFF;
}
le_int32 MarkToMarkPositioningSubtable::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;
}
GlyphIterator mark2Iterator(*glyphIterator);
LEGlyphID mark2Glyph = findMark2Glyph(&mark2Iterator);
le_int32 mark2Coverage = getBaseCoverage((LEGlyphID) mark2Glyph);
const Mark2Array *mark2Array = (const Mark2Array *) ((char *) this + SWAPW(baseArrayOffset));
le_uint16 mark2Count = SWAPW(mark2Array->mark2RecordCount);
if (mark2Coverage < 0 || mark2Coverage >= mark2Count) {
// The mark2 glyph isn't covered, or the coverage
// index is too big. The latter means that the
// table is mal-formed...
return 0;
}
const Mark2Record *mark2Record = &mark2Array->mark2RecordArray[mark2Coverage * mcCount];
Offset anchorTableOffset = SWAPW(mark2Record->mark2AnchorTableOffsetArray[markClass]);
const AnchorTable *anchorTable = (const AnchorTable *) ((char *) mark2Array + anchorTableOffset);
LEPoint mark2Anchor, markAdvance, pixels;
anchorTable->getAnchor(mark2Glyph, fontInstance, mark2Anchor);
fontInstance->getGlyphAdvance(markGlyph, pixels);
fontInstance->pixelsToUnits(pixels, markAdvance);
float anchorDiffX = mark2Anchor.fX - markAnchor.fX;
float anchorDiffY = mark2Anchor.fY - markAnchor.fY;
glyphIterator->setCurrGlyphBaseOffset(mark2Iterator.getCurrStreamPosition());
if (glyphIterator->isRightToLeft()) {
glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
} else {
LEPoint mark2Advance;
fontInstance->getGlyphAdvance(mark2Glyph, pixels);
fontInstance->pixelsToUnits(pixels, mark2Advance);
glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - mark2Advance.fX, anchorDiffY - mark2Advance.fY, -markAdvance.fX, -markAdvance.fY);
}
return 1;
}
U_NAMESPACE_END
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