/*

 * 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

 * questions.

 *

 */

/*

 *

 * (C) Copyright IBM Corp and Others. 1998-2013 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "MorphTables.h"

#include "StateTables.h"

#include "MorphStateTables.h"

#include "SubtableProcessor2.h"

#include "StateTableProcessor2.h"

#include "LigatureSubstProc2.h"

#include "LEGlyphStorage.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))

#define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))

#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor2)

LigatureSubstitutionProcessor2::LigatureSubstitutionProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)

  : StateTableProcessor2(morphSubtableHeader, success),

  ligActionOffset(0),

  ligatureSubstitutionHeader(morphSubtableHeader, success), componentOffset(0), ligatureOffset(0), entryTable()

{

    if (LE_FAILURE(success)) return;

    ligActionOffset = SWAPL(ligatureSubstitutionHeader->ligActionOffset);

    componentOffset = SWAPL(ligatureSubstitutionHeader->componentOffset);

    ligatureOffset = SWAPL(ligatureSubstitutionHeader->ligatureOffset);

    entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);

}

LigatureSubstitutionProcessor2::~LigatureSubstitutionProcessor2()

{

}

void LigatureSubstitutionProcessor2::beginStateTable()

{

    m = -1;

}

le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index, LEErrorCode &success)

{

    const LigatureSubstitutionStateEntry2 *entry = entryTable.getAlias(index, success);

    if(LE_FAILURE(success)) return 0;

    le_uint16 nextStateIndex = SWAPW(entry->nextStateIndex);

    le_uint16 flags = SWAPW(entry->entryFlags);

    le_uint16 ligActionIndex = SWAPW(entry->ligActionIndex);

    if (flags & lsfSetComponent) {

        if (++m >= nComponents) {

            m = 0;

        }

        componentStack[m] = currGlyph;

    } else if ( m == -1) {

        // bad font- skip this glyph.

        //LE_DEBUG_BAD_FONT("m==-1 (componentCount went negative)")

        currGlyph+= dir;

        return nextStateIndex;

    }

    ByteOffset actionOffset = flags & lsfPerformAction;

    if (actionOffset != 0) {

        LEReferenceTo<LigatureActionEntry> ap(stHeader, success, ligActionOffset); // byte offset

        ap.addObject(ligActionIndex, success);

        LEReferenceToArrayOf<TTGlyphID> ligatureTable(stHeader, success, ligatureOffset, LE_UNBOUNDED_ARRAY);

        LigatureActionEntry action;

        le_int32 offset, i = 0;

        le_int32 stack[nComponents];

        le_int16 mm = -1;

        LEReferenceToArrayOf<le_uint16> componentTable(stHeader, success, componentOffset, LE_UNBOUNDED_ARRAY);

        if(LE_FAILURE(success)) {

          currGlyph+= dir;

          return nextStateIndex; // get out! bad font

        }

        do {

            le_uint32 componentGlyph = componentStack[m--]; // pop off

            action = SWAPL(*ap.getAlias());

            if (m < 0) {

                m = nComponents - 1;

            }

            offset = action & lafComponentOffsetMask;

            if (offset != 0) {

                  LE_DEBUG_BAD_FONT("preposterous componentGlyph");

                  currGlyph+= dir;

                  return nextStateIndex; // get out! bad font

                }

                i += SWAPW(componentTable(LE_GET_GLYPH(glyphStorage[componentGlyph]) + (SignExtend(offset, lafComponentOffsetMask)),success));

                if (action & (lafLast | lafStore))  {

                  TTGlyphID ligatureGlyph = SWAPW(ligatureTable(i,success));

                    glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph);

                    if(mm==nComponents) {

                      LE_DEBUG_BAD_FONT("exceeded nComponents");

                      mm--; // don't overrun the stack.

                    }

                    stack[++mm] = componentGlyph;

                    i = 0;

                } else {

                    glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF);

                }

            }

#if LE_ASSERT_BAD_FONT

            if(m<0) {

              LE_DEBUG_BAD_FONT("m<0")

            }

#endif

            ap.addObject(success);

        } while (LE_SUCCESS(success) && !(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items

        while (mm >= 0) {

            if (++m >= nComponents) {

                m = 0;

            }

            componentStack[m] = stack[mm--];

        }

    }

    if (!(flags & lsfDontAdvance)) {

        currGlyph += dir;

    }

    return nextStateIndex;

}

void LigatureSubstitutionProcessor2::endStateTable()

{

}

U_NAMESPACE_END