MarkToBasePosnSubtables.cpp [plain text]
#include "LETypes.h"
#include "LEFontInstance.h"
#include "OpenTypeTables.h"
#include "AnchorTables.h"
#include "MarkArrays.h"
#include "GlyphPositioningTables.h"
#include "AttachmentPosnSubtables.h"
#include "MarkToBasePosnSubtables.h"
#include "GlyphIterator.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const
{
if (glyphIterator->prev()) {
return glyphIterator->getCurrGlyphID();
}
return 0xFFFF;
}
le_int32 MarkToBasePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
{
LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
if (markCoverage < 0) {
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) {
return 0;
}
GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks ));
LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph);
const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);
if (baseCoverage < 0 || baseCoverage >= baseCount) {
return 0;
}
const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
LEPoint baseAnchor, markAdvance, pixels;
if (anchorTableOffset == 0) {
glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
return 0;
}
anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);
fontInstance->getGlyphAdvance(markGlyph, pixels);
fontInstance->pixelsToUnits(pixels, markAdvance);
float anchorDiffX = baseAnchor.fX - markAnchor.fX;
float anchorDiffY = baseAnchor.fY - markAnchor.fY;
glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
if (glyphIterator->isRightToLeft()) {
glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
} else {
LEPoint baseAdvance;
fontInstance->getGlyphAdvance(baseGlyph, pixels);
fontInstance->pixelsToUnits(pixels, baseAdvance);
glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.fY, -markAdvance.fX, -markAdvance.fY);
}
return 1;
}
U_NAMESPACE_END