icu4c/source/layout/CursiveAttachmentSubtables.cpp

/*
 * Copyright (C) 2016 and later: Unicode, Inc. and others. License & terms of use: http://www.unicode.org/copyright.html
 *
 */

#include "LETypes.h"
#include "OpenTypeTables.h"
#include "GlyphPositioningTables.h"
#include "CursiveAttachmentSubtables.h"
#include "AnchorTables.h"
#include "GlyphIterator.h"
#include "OpenTypeUtilities.h"
#include "LESwaps.h"

U_NAMESPACE_BEGIN

le_uint32 CursiveAttachmentSubtable::process(const LEReferenceTo<CursiveAttachmentSubtable> &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
{
    LEGlyphID glyphID       = glyphIterator->getCurrGlyphID();
    le_int32  coverageIndex = getGlyphCoverage(base, glyphID, success);
    le_uint16 eeCount       = SWAPW(entryExitCount);

    LEReferenceToArrayOf<EntryExitRecord>
        entryExitRecordsArrayRef(base, success, entryExitRecords, coverageIndex);

    if (coverageIndex < 0 || coverageIndex >= eeCount || LE_FAILURE(success)) {
        glyphIterator->setCursiveGlyph();
        return 0;
    }

    LEPoint entryAnchor, exitAnchor;
    Offset entryOffset = SWAPW(entryExitRecords[coverageIndex].entryAnchor);
    Offset exitOffset  = SWAPW(entryExitRecords[coverageIndex].exitAnchor);

    if (entryOffset != 0) {
        const AnchorTable *entryAnchorTable = (const AnchorTable *) ((char *) this + entryOffset);

        entryAnchorTable->getAnchor(glyphID, fontInstance, entryAnchor);
        glyphIterator->setCursiveEntryPoint(entryAnchor);
    } else {
        //glyphIterator->clearCursiveEntryPoint();
    }

    if (exitOffset != 0) {
        const AnchorTable *exitAnchorTable = (const AnchorTable *) ((char *) this + exitOffset);

        exitAnchorTable->getAnchor(glyphID, fontInstance, exitAnchor);
        glyphIterator->setCursiveExitPoint(exitAnchor);
    } else {
        //glyphIterator->clearCursiveExitPoint();
    }

    return 1;
}

U_NAMESPACE_END