98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* @(#)MarkToBasePosnSubtables.cpp 1.5 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - 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 "MarkToBasePosnSubtables.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 MarkToBasePositioningSubtable::findBaseGlyph(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 MarkToBasePositioningSubtable::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 base glyph before a previous ligature...
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GlyphIterator baseIterator(*glyphIterator, lfIgnoreMarks /*| lfIgnoreLigatures*/);
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LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
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le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph);
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const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
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le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);
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if (baseCoverage < 0 || baseCoverage >= baseCount) {
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// The base 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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const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
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Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
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const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
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LEPoint baseAnchor, markAdvance, pixels;
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anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);
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fontInstance->getGlyphAdvance(markGlyph, pixels);
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fontInstance->pixelsToUnits(pixels, markAdvance);
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float anchorDiffX = baseAnchor.fX - markAnchor.fX;
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float anchorDiffY = baseAnchor.fY - markAnchor.fY;
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if (glyphIterator->isRightToLeft()) {
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float adjustX = markAdvance.fX + anchorDiffX;
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glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX, -anchorDiffY, -adjustX, anchorDiffY);
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} else {
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LEPoint baseAdvance;
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fontInstance->getGlyphAdvance(baseGlyph, pixels);
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fontInstance->pixelsToUnits(pixels, baseAdvance);
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float adjustX = baseAdvance.fX - anchorDiffX;
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float advAdjustX = adjustX - markAdvance.fX;
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glyphIterator->adjustCurrGlyphPositionAdjustment(-adjustX, -anchorDiffY, advAdjustX, anchorDiffY);
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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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