/*

 *

 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved 

 *

 * This file is a modification of the ICU file IndicLayoutEngine.cpp

 * by Jens Herden and Javier Sola for Khmer language 

 *

 */

#include "OpenTypeLayoutEngine.h"

#include "KhmerLayoutEngine.h"

#include "LEGlyphStorage.h"

#include "KhmerReordering.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)

KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

                    le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)

    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)

{

    fFeatureOrder = KhmerReordering::getFeatureOrder();

}

KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

						     le_int32 typoFlags)

    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)

{

    fFeatureOrder = KhmerReordering::getFeatureOrder();

}

KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()

{

    // nothing to do

}

// Input: characters

// Output: characters, char indices, tags

// Returns: output character count

le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,

        LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)

{

    if (LE_FAILURE(success)) {

        return 0;

    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {

        success = LE_ILLEGAL_ARGUMENT_ERROR;

        return 0;

    }

    le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough

    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    if (outChars == NULL) {

        success = LE_MEMORY_ALLOCATION_ERROR;

        return 0;

    }

    glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);

    glyphStorage.allocateAuxData(success);

    if (LE_FAILURE(success)) {

        LE_DELETE_ARRAY(outChars);

        return 0;

    }

    // NOTE: assumes this allocates featureTags...

    // (probably better than doing the worst case stuff here...)

    le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);

    glyphStorage.adoptGlyphCount(outCharCount);

    return outCharCount;

}

U_NAMESPACE_END