CanonShaping.cpp

/*
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 *
 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
 *
 */

#include "LETypes.h"
#include "LEGlyphStorage.h"
#include "CanonShaping.h"
#include "GlyphDefinitionTables.h"
#include "ClassDefinitionTables.h"

U_NAMESPACE_BEGIN

void CanonShaping::sortMarks(le_int32 *indices, const le_int32 *combiningClasses, le_int32 index, le_int32 limit)
{
    for (le_int32 j = index + 1; j < limit; j += 1) {
        le_int32 i;
        le_int32 v = indices[j];
        le_int32 c = combiningClasses[v];

        for (i = j - 1; i >= index; i -= 1) {
            if (c >= combiningClasses[indices[i]]) {
                break;
            }

            indices[i + 1] = indices[i];
        }

        indices[i + 1] = v;
    }
}

void CanonShaping::reorderMarks(const LEUnicode *inChars, le_int32 charCount, le_bool rightToLeft,
                                LEUnicode *outChars, LEGlyphStorage &glyphStorage)
{
    LEErrorCode success = LE_NO_ERROR;
    LEReferenceTo<GlyphDefinitionTableHeader> gdefTable(LETableReference::kStaticData, CanonShaping::glyphDefinitionTable, CanonShaping::glyphDefinitionTableLen);
    LEReferenceTo<ClassDefinitionTable> classTable = gdefTable->getMarkAttachClassDefinitionTable(gdefTable, success);
    le_int32 *combiningClasses = LE_NEW_ARRAY(le_int32, charCount);
    le_int32 *indices = LE_NEW_ARRAY(le_int32, charCount);
    le_int32 i;

    if (combiningClasses == NULL || indices == NULL) {
        if (combiningClasses != NULL) {
            LE_DELETE_ARRAY(combiningClasses);
        }
        if (indices != NULL) {
            LE_DELETE_ARRAY(indices);
        }
        return;
    }

    for (i = 0; i < charCount; i += 1) {
      combiningClasses[i] = classTable->getGlyphClass(classTable, (LEGlyphID) inChars[i], success);
        indices[i] = i;
    }

    for (i = 0; i < charCount; i += 1) {
        if (combiningClasses[i] != 0) {
            le_int32 mark;

            for (mark = i; mark < charCount; mark += 1) {
                if (combiningClasses[mark] == 0) {
                    break;
                }
            }

            sortMarks(indices, combiningClasses, i, mark);
        }
    }

    le_int32 out = 0, dir = 1;

    if (rightToLeft) {
        out = charCount - 1;
        dir = -1;
    }

    for (i = 0; i < charCount; i += 1, out += dir) {
        le_int32 index = indices[i];

        outChars[i] = inChars[index];
        glyphStorage.setCharIndex(out, index, success);
    }

    LE_DELETE_ARRAY(indices);
    LE_DELETE_ARRAY(combiningClasses);
}

U_NAMESPACE_END