98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
/*
|
|
* @(#)MarkToLigaturePositioningSubtables.cpp 1.5 00/03/15
|
|
*
|
|
* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
|
|
*
|
|
*/
|
|
|
|
#include "LETypes.h"
|
|
#include "LEFontInstance.h"
|
|
#include "OpenTypeTables.h"
|
|
#include "AnchorTables.h"
|
|
#include "MarkArrays.h"
|
|
#include "GlyphPositioningTables.h"
|
|
#include "AttachmentPositioningSubtables.h"
|
|
#include "MarkToLigaturePositioningSubtables.h"
|
|
#include "GlyphIterator.h"
|
|
#include "LESwaps.h"
|
|
|
|
LEGlyphID MarkToLigaturePositioningSubtable::findLigatureGlyph(GlyphIterator *glyphIterator)
|
|
{
|
|
if (glyphIterator->prev()) {
|
|
return glyphIterator->getCurrGlyphID();
|
|
}
|
|
|
|
return 0xFFFF;
|
|
}
|
|
|
|
le_int32 MarkToLigaturePositioningSubtable::process(GlyphIterator *glyphIterator, LEFontInstance *fontInstance)
|
|
{
|
|
LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
|
|
le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
|
|
|
|
if (markCoverage < 0) {
|
|
// markGlyph isn't a covered mark glyph
|
|
return 0;
|
|
}
|
|
|
|
LEPoint markAnchor;
|
|
MarkArray *markArray = (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 ligature before a previous base glyph...
|
|
GlyphIterator ligatureIterator(*glyphIterator, lfIgnoreMarks /*| lfIgnoreBaseGlyphs*/);
|
|
LEGlyphID ligatureGlyph = findLigatureGlyph(&ligatureIterator);
|
|
le_int32 ligatureCoverage = getBaseCoverage((LEGlyphID) ligatureGlyph);
|
|
LigatureArray *ligatureArray = (LigatureArray *) ((char *) this + SWAPW(baseArrayOffset));
|
|
le_uint16 ligatureCount = SWAPW(ligatureArray->ligatureCount);
|
|
|
|
if (ligatureCoverage < 0 || ligatureCoverage >= ligatureCount) {
|
|
// The ligature glyph isn't covered, or the coverage
|
|
// index is too big. The latter means that the
|
|
// table is mal-formed...
|
|
return 0;
|
|
}
|
|
|
|
le_int32 markPosition = glyphIterator->getCurrStreamPosition();
|
|
le_int32 component = ligatureIterator.getMarkComponent(markPosition);
|
|
Offset ligatureAttachOffset = SWAPW(ligatureArray->ligatureAttachTableOffsetArray[ligatureCoverage]);
|
|
LigatureAttachTable *ligatureAttachTable = (LigatureAttachTable *) ((char *) ligatureArray + ligatureAttachOffset);
|
|
ComponentRecord *componentRecord = &ligatureAttachTable->componentRecordArray[component * mcCount];
|
|
Offset anchorTableOffset = SWAPW(componentRecord->ligatureAnchorTableOffsetArray[markClass]);
|
|
AnchorTable *anchorTable = (AnchorTable *) ((char *) ligatureAttachTable + anchorTableOffset);
|
|
LEPoint ligatureAnchor, markAdvance, pixels;
|
|
|
|
anchorTable->getAnchor(ligatureGlyph, fontInstance, ligatureAnchor);
|
|
|
|
fontInstance->getGlyphAdvance(markGlyph, pixels);
|
|
fontInstance->pixelsToUnits(pixels, markAdvance);
|
|
|
|
float anchorDiffX = ligatureAnchor.fX - markAnchor.fX;
|
|
float anchorDiffY = ligatureAnchor.fY - markAnchor.fY;
|
|
|
|
if (glyphIterator->isRightToLeft()) {
|
|
float adjustX = markAdvance.fX + anchorDiffX;
|
|
|
|
glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX, -anchorDiffY, -adjustX, anchorDiffY);
|
|
} else {
|
|
LEPoint ligatureAdvance;
|
|
|
|
fontInstance->getGlyphAdvance(ligatureGlyph, pixels);
|
|
fontInstance->pixelsToUnits(pixels, ligatureAdvance);
|
|
|
|
float adjustX = ligatureAdvance.fX - anchorDiffX;
|
|
float advAdjustX = adjustX - markAdvance.fX;
|
|
|
|
glyphIterator->adjustCurrGlyphPositionAdjustment(-adjustX, -anchorDiffY, advAdjustX, anchorDiffY);
|
|
}
|
|
|
|
return 1;
|
|
}
|