/*

 * 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

/*

 *

 * (C) Copyright IBM Corp. 1998-2010 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "LayoutEngine.h"

#include "ThaiLayoutEngine.h"

#include "ScriptAndLanguageTags.h"

#include "LEGlyphStorage.h"

#include "KernTable.h"

#include "ThaiShaping.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)

ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)

    : LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)

{

    fErrorChar = 0x25CC;

    // Figure out which presentation forms the font uses

    if (! fontInstance->canDisplay(0x0E01)) {

        // No Thai in font; don't use presentation forms.

        fGlyphSet = 3;

    } else 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;

}

// This is the same as LayoutEngline::adjustGlyphPositions() except that it doesn't call adjustMarkGlyphs

void ThaiLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool  /*reverse*/,

                                        LEGlyphStorage &glyphStorage, LEErrorCode &success)

{

    if (LE_FAILURE(success)) {

        return;

    }

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

        success = LE_ILLEGAL_ARGUMENT_ERROR;

        return;

    }

    }

    // default is no adjustments

    return;

}

U_NAMESPACE_END