94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/*
|
|
* @(#)MarkToMarkPositioningSubtables.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 "MarkToMarkPositioningSubtables.h"
|
|
#include "GlyphIterator.h"
|
|
#include "LESwaps.h"
|
|
|
|
LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator)
|
|
{
|
|
if (glyphIterator->prev()) {
|
|
return glyphIterator->getCurrGlyphID();
|
|
}
|
|
|
|
return 0xFFFF;
|
|
}
|
|
|
|
le_int32 MarkToMarkPositioningSubtable::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 mark before a previous base glyph...
|
|
GlyphIterator mark2Iterator(*glyphIterator, lfIgnoreLigatures /*| lfIgnoreBaseGlyphs*/);
|
|
LEGlyphID mark2Glyph = findMark2Glyph(&mark2Iterator);
|
|
le_int32 mark2Coverage = getBaseCoverage((LEGlyphID) mark2Glyph);
|
|
Mark2Array *mark2Array = (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;
|
|
}
|
|
|
|
Mark2Record *mark2Record = &mark2Array->mark2RecordArray[mark2Coverage * mcCount];
|
|
Offset anchorTableOffset = SWAPW(mark2Record->mark2AnchorTableOffsetArray[markClass]);
|
|
AnchorTable *anchorTable = (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;
|
|
|
|
if (glyphIterator->isRightToLeft()) {
|
|
float adjustX = markAdvance.fX + anchorDiffX;
|
|
|
|
glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX, -anchorDiffY, -adjustX, anchorDiffY);
|
|
} else {
|
|
LEPoint mark2Advance;
|
|
|
|
fontInstance->getGlyphAdvance(mark2Glyph, pixels);
|
|
fontInstance->pixelsToUnits(pixels, mark2Advance);
|
|
|
|
float adjustX = mark2Advance.fX - anchorDiffX;
|
|
float advAdjustX = adjustX - markAdvance.fX;
|
|
|
|
glyphIterator->adjustCurrGlyphPositionAdjustment(-adjustX, -anchorDiffY, advAdjustX, anchorDiffY);
|
|
}
|
|
|
|
return 1;
|
|
}
|