/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * 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.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

/*

 *

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

 *

 */

#include "LETypes.h"

#include "LayoutEngine.h"

#include "ThaiLayoutEngine.h"

#include "ScriptAndLanguageTags.h"

#include "LEGlyphStorage.h"

#include "ThaiShaping.h"

ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance,

    le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)

    : LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)

{

    fErrorChar = 0x25CC;

    // Figure out which presentation forms the font uses

    if (fontInstance->canDisplay(0x0E64)) {

        // WorldType uses reserved space in Thai block

        fGlyphSet = 0;

    } else if (fontInstance->canDisplay(0xF701)) {

        // Microsoft corporate zone

        fGlyphSet = 1;

        if (!fontInstance->canDisplay(fErrorChar)) {

            fErrorChar = 0xF71B;

        }

    } else if (fontInstance->canDisplay(0xF885)) {

        // Apple corporate zone

        fGlyphSet = 2;

    } else {

        // no presentation forms in the font

        fGlyphSet = 3;

    }

}

ThaiLayoutEngine::~ThaiLayoutEngine()

{

    // nothing to do

}

// Input: characters (0..max provided for context)

// Output: glyphs, char indices

// Returns: the glyph count

// NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...

le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset,

    le_int32 count, le_int32 max, le_bool /*rightToLeft*/,

    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;

    }

    LEUnicode *outChars;

    le_int32 glyphCount;

    // This is enough room for the worst-case expansion

    // (it says here...)

    outChars = LE_NEW_ARRAY(LEUnicode, count * 2);

    if (outChars == NULL) {

        success = LE_MEMORY_ALLOCATION_ERROR;

        return 0;

    }

    glyphStorage.allocateGlyphArray(count * 2, FALSE, success);

    if (LE_FAILURE(success)) {

        LE_DELETE_ARRAY(outChars);

        success = LE_MEMORY_ALLOCATION_ERROR;

        return 0;

    }

    glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar,

        outChars, glyphStorage);

    mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);

    LE_DELETE_ARRAY(outChars);

    glyphStorage.adoptGlyphCount(glyphCount);

    return glyphCount;

}