/*

 *

 * (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)

{

    const GlyphDefinitionTableHeader *gdefTable = (const GlyphDefinitionTableHeader *) glyphDefinitionTable;

    const ClassDefinitionTable *classTable = gdefTable->getMarkAttachClassDefinitionTable();

    le_int32 *combiningClasses = LE_NEW_ARRAY(le_int32, charCount);

    le_int32 *indices = LE_NEW_ARRAY(le_int32, charCount);

    LEErrorCode status = LE_NO_ERROR;

    le_int32 i;

    for (i = 0; i < charCount; i += 1) {

        combiningClasses[i] = classTable->getGlyphClass((LEGlyphID) inChars[i]);

        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, status);

    }

    LE_DELETE_ARRAY(indices);

    LE_DELETE_ARRAY(combiningClasses);

}

U_NAMESPACE_END