jdk/src/share/native/sun/font/layout/ContextualGlyphSubstProc2.cpp
author prr
Thu, 07 Mar 2013 10:02:20 -0800
changeset 16891 91e99bed64ae
parent 16890 36b30720a997
child 23908 fdbaab67db73
permissions -rw-r--r--
8001031: Better font processing Reviewed-by: srl, vadim
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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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/*
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 *
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 * (C) Copyright IBM Corp.  and others 1998-2013 - All Rights Reserved
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 *
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 */
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#include "LETypes.h"
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#include "MorphTables.h"
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#include "StateTables.h"
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#include "MorphStateTables.h"
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#include "SubtableProcessor2.h"
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#include "StateTableProcessor2.h"
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#include "ContextualGlyphSubstProc2.h"
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#include "LEGlyphStorage.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor2)
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ContextualGlyphSubstitutionProcessor2::ContextualGlyphSubstitutionProcessor2(
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                                  const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
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  : StateTableProcessor2(morphSubtableHeader, success), contextualGlyphHeader(morphSubtableHeader, success)
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{
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    if(LE_FAILURE(success)) return;
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    le_uint32 perGlyphTableOffset = SWAPL(contextualGlyphHeader->perGlyphTableOffset);
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    perGlyphTable = LEReferenceToArrayOf<le_uint32> (stHeader, success, perGlyphTableOffset, LE_UNBOUNDED_ARRAY);
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    entryTable = LEReferenceToArrayOf<ContextualGlyphStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
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}
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ContextualGlyphSubstitutionProcessor2::~ContextualGlyphSubstitutionProcessor2()
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{
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}
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void ContextualGlyphSubstitutionProcessor2::beginStateTable()
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{
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    markGlyph = 0;
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}
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le_uint16 ContextualGlyphSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph,
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    EntryTableIndex2 index, LEErrorCode &success)
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{
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    if(LE_FAILURE(success)) return 0;
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    const ContextualGlyphStateEntry2 *entry = entryTable.getAlias(index, success);
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    if(LE_FAILURE(success)) return 0;
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    le_uint16 newState = SWAPW(entry->newStateIndex);
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    le_uint16 flags = SWAPW(entry->flags);
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    le_int16 markIndex = SWAPW(entry->markIndex);
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    le_int16 currIndex = SWAPW(entry->currIndex);
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    if (markIndex != -1) {
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        le_uint32 offset = SWAPL(perGlyphTable(markIndex, success));
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        LEGlyphID mGlyph = glyphStorage[markGlyph];
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        TTGlyphID newGlyph = lookup(offset, mGlyph, success);
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        glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
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    }
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    if (currIndex != -1) {
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        le_uint32 offset = SWAPL(perGlyphTable(currIndex, success));
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        LEGlyphID thisGlyph = glyphStorage[currGlyph];
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        TTGlyphID newGlyph = lookup(offset, thisGlyph, success);
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        glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);
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    }
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    if (flags & cgsSetMark) {
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        markGlyph = currGlyph;
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    }
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    if (!(flags & cgsDontAdvance)) {
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        currGlyph += dir;
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    }
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    return newState;
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}
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TTGlyphID ContextualGlyphSubstitutionProcessor2::lookup(le_uint32 offset, LEGlyphID gid, LEErrorCode &success)
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{
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    TTGlyphID newGlyph = 0xFFFF;
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    if(LE_FAILURE(success))  return newGlyph;
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    LEReferenceTo<LookupTable> lookupTable(perGlyphTable, success, offset);
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    if(LE_FAILURE(success))  return newGlyph;
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    le_int16 format = SWAPW(lookupTable->format);
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    switch (format) {
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        case ltfSimpleArray: {
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#ifdef TEST_FORMAT
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            // Disabled pending for design review
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            LEReferenceTo<SimpleArrayLookupTable> lookupTable0(lookupTable, success);
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            LEReferenceToArrayOf<LookupValue> valueArray(lookupTable0, success, &lookupTable0->valueArray[0], LE_UNBOUNDED_ARRAY);
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            if(LE_FAILURE(success))  return newGlyph;
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            TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
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            newGlyph = SWAPW(lookupTable0->valueArray(glyphCode, success));
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#endif
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            break;
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        }
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        case ltfSegmentSingle: {
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#ifdef TEST_FORMAT
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            // Disabled pending for design review
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            LEReferenceTo<SegmentSingleLookupTable> lookupTable2 = (SegmentSingleLookupTable *) lookupTable;
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            const LookupSegment *segment = lookupTable2->lookupSegment(lookupTable2->segments, gid);
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            if (segment != NULL) {
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                newGlyph = SWAPW(segment->value);
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            }
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#endif
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            break;
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        }
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        case ltfSegmentArray: {
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            //printf("Context Lookup Table Format4: specific interpretation needed!\n");
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            break;
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        }
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        case ltfSingleTable:
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        {
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#ifdef TEST_FORMAT
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            // Disabled pending for design review
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            LEReferenceTo<SingleTableLookupTable> lookupTable6 = (SingleTableLookupTable *) lookupTable;
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            const LEReferenceTo<LookupSingle> segment = lookupTable6->lookupSingle(lookupTable6->entries, gid);
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            if (segment != NULL) {
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                newGlyph = SWAPW(segment->value);
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            }
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#endif
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            break;
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        }
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        case ltfTrimmedArray: {
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            LEReferenceTo<TrimmedArrayLookupTable> lookupTable8(lookupTable, success);
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            if (LE_FAILURE(success)) return newGlyph;
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            TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);
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            TTGlyphID glyphCount = SWAPW(lookupTable8->glyphCount);
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            TTGlyphID lastGlyph  = firstGlyph + glyphCount;
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            TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
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            if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
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              LEReferenceToArrayOf<LookupValue> valueArray(lookupTable8, success, &lookupTable8->valueArray[0], glyphCount);
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              newGlyph = SWAPW(valueArray(glyphCode - firstGlyph, success));
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            }
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        }
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        default:
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            break;
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    }
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    return newGlyph;
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}
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void ContextualGlyphSubstitutionProcessor2::endStateTable()
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{
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}
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U_NAMESPACE_END