106 lines
4.0 KiB
C++
106 lines
4.0 KiB
C++
/*
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* %W% %E%
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*
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* (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "LEFontInstance.h"
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#include "OpenTypeTables.h"
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#include "AnchorTables.h"
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#include "MarkArrays.h"
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#include "GlyphPositioningTables.h"
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#include "AttachmentPosnSubtables.h"
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#include "MarkToLigaturePosnSubtables.h"
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#include "GlyphIterator.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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LEGlyphID MarkToLigaturePositioningSubtable::findLigatureGlyph(GlyphIterator *glyphIterator) const
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{
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if (glyphIterator->prev()) {
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return glyphIterator->getCurrGlyphID();
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}
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return 0xFFFF;
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}
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le_int32 MarkToLigaturePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
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{
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LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
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le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
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if (markCoverage < 0) {
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// markGlyph isn't a covered mark glyph
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return 0;
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}
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LEPoint markAnchor;
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const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
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le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
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le_uint16 mcCount = SWAPW(classCount);
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if (markClass < 0 || markClass >= mcCount) {
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// markGlyph isn't in the mark array or its
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// mark class is too big. The table is mal-formed!
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return 0;
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}
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// FIXME: we probably don't want to find a ligature before a previous base glyph...
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GlyphIterator ligatureIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreBaseGlyphs*/));
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LEGlyphID ligatureGlyph = findLigatureGlyph(&ligatureIterator);
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le_int32 ligatureCoverage = getBaseCoverage((LEGlyphID) ligatureGlyph);
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const LigatureArray *ligatureArray = (const LigatureArray *) ((char *) this + SWAPW(baseArrayOffset));
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le_uint16 ligatureCount = SWAPW(ligatureArray->ligatureCount);
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if (ligatureCoverage < 0 || ligatureCoverage >= ligatureCount) {
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// The ligature glyph isn't covered, or the coverage
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// index is too big. The latter means that the
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// table is mal-formed...
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return 0;
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}
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le_int32 markPosition = glyphIterator->getCurrStreamPosition();
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Offset ligatureAttachOffset = SWAPW(ligatureArray->ligatureAttachTableOffsetArray[ligatureCoverage]);
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const LigatureAttachTable *ligatureAttachTable = (const LigatureAttachTable *) ((char *) ligatureArray + ligatureAttachOffset);
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le_int32 componentCount = SWAPW(ligatureAttachTable->componentCount);
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le_int32 component = ligatureIterator.getMarkComponent(markPosition);
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if (component >= componentCount) {
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// should really just bail at this point...
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component = componentCount - 1;
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}
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const ComponentRecord *componentRecord = &ligatureAttachTable->componentRecordArray[component * mcCount];
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Offset anchorTableOffset = SWAPW(componentRecord->ligatureAnchorTableOffsetArray[markClass]);
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const AnchorTable *anchorTable = (const AnchorTable *) ((char *) ligatureAttachTable + anchorTableOffset);
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LEPoint ligatureAnchor, markAdvance, pixels;
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anchorTable->getAnchor(ligatureGlyph, fontInstance, ligatureAnchor);
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fontInstance->getGlyphAdvance(markGlyph, pixels);
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fontInstance->pixelsToUnits(pixels, markAdvance);
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float anchorDiffX = ligatureAnchor.fX - markAnchor.fX;
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float anchorDiffY = ligatureAnchor.fY - markAnchor.fY;
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glyphIterator->setCurrGlyphBaseOffset(ligatureIterator.getCurrStreamPosition());
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if (glyphIterator->isRightToLeft()) {
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glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
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} else {
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LEPoint ligatureAdvance;
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fontInstance->getGlyphAdvance(ligatureGlyph, pixels);
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fontInstance->pixelsToUnits(pixels, ligatureAdvance);
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glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX - ligatureAdvance.fX, anchorDiffY - ligatureAdvance.fY, -markAdvance.fX, -markAdvance.fY);
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}
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return 1;
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}
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U_NAMESPACE_END
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