116 lines
4.4 KiB
C++
116 lines
4.4 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 1998-2013 - 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(const LETableReference &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
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{
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LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
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le_int32 markCoverage = getGlyphCoverage(base, (LEGlyphID) markGlyph, success);
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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, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/));
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LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
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le_int32 baseCoverage = getBaseCoverage(base, (LEGlyphID) baseGlyph, success);
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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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if (anchorTableOffset == 0) {
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// this means the table is mal-formed...
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glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
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return 0;
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}
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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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glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
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if (glyphIterator->isRightToLeft()) {
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// FIXME: need similar patch to below; also in MarkToLigature and MarkToMark
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// (is there a better way to approach this for all the cases?)
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glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
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} else {
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LEPoint baseAdvance;
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fontInstance->getGlyphAdvance(baseGlyph, pixels);
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//JK: adjustment needs to account for non-zero advance of any marks between base glyph and current mark
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GlyphIterator gi(baseIterator, (le_uint16)0); // copy of baseIterator that won't ignore marks
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gi.next(); // point beyond the base glyph
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while (gi.getCurrStreamPosition() < glyphIterator->getCurrStreamPosition()) { // for all intervening glyphs (marks)...
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LEGlyphID otherMark = gi.getCurrGlyphID();
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LEPoint px;
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fontInstance->getGlyphAdvance(otherMark, px); // get advance, in case it's non-zero
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pixels.fX += px.fX; // and add that to the base glyph's advance
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pixels.fY += px.fY;
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gi.next();
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}
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// end of JK patch
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fontInstance->pixelsToUnits(pixels, baseAdvance);
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glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.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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