ICU-511.35.tar.gz

[apple/icu.git] / icuSources / layout / ContextualGlyphInsertionProc2.cpp

/*
 *
 * (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 "ContextualGlyphInsertionProc2.h"
#include "LEGlyphStorage.h"
#include "LESwaps.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphInsertionProcessor2)

ContextualGlyphInsertionProcessor2::ContextualGlyphInsertionProcessor2(const MorphSubtableHeader2 *morphSubtableHeader)
  : StateTableProcessor2(morphSubtableHeader)
{
    contextualGlyphHeader = (const ContextualGlyphInsertionHeader2 *) morphSubtableHeader;
    le_uint32 insertionTableOffset = SWAPL(contextualGlyphHeader->insertionTableOffset);
    insertionTable = ((le_uint16 *) ((char *)&stateTableHeader->stHeader + insertionTableOffset));
    entryTable = (const ContextualGlyphInsertionStateEntry2 *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
}

ContextualGlyphInsertionProcessor2::~ContextualGlyphInsertionProcessor2()
{
}

void ContextualGlyphInsertionProcessor2::beginStateTable()
{
    markGlyph = 0;
}

le_uint16 ContextualGlyphInsertionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index)
{
    const ContextualGlyphInsertionStateEntry2 *entry = &entryTable[index];
    le_uint16 newState = SWAPW(entry->newStateIndex);
    le_uint16 flags = SWAPW(entry->flags);
    le_int16 currIndex = SWAPW(entry->currentInsertionListIndex);
    le_int16 markIndex = SWAPW(entry->markedInsertionListIndex);
    int i = 0;
    
    if (markIndex > 0) {
        le_int16 count = (flags & cgiMarkedInsertCountMask) >> 5;
        if (!(flags & cgiMarkedIsKashidaLike)) {
            // extra glyph(s) will be added directly before/after the specified marked glyph
            if (!(flags & cgiMarkInsertBefore)) {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(markGlyph, count + 1);
                for (i = 0; i < count; i++, markIndex++) {
                    insertGlyphs[i] = insertionTable[markIndex];
                }
                insertGlyphs[i] = glyphStorage[markGlyph];
                glyphStorage.applyInsertions();
            } else {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(markGlyph, count + 1);
                insertGlyphs[0] = glyphStorage[markGlyph];
                for (i = 1; i < count + 1; i++, markIndex++) {
                    insertGlyphs[i] = insertionTable[markIndex];
                }
                glyphStorage.applyInsertions();
            }            
        } else {
            // inserted as a split-vowel-like insertion
            // extra glyph(s) will be inserted some distance away from the marked glyph
            if (!(flags & cgiMarkInsertBefore)) {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(markGlyph, count + 1);
                for (i = 0; i < count; i++, markIndex++) {
                    insertGlyphs[i] = insertionTable[markIndex];
                }
                insertGlyphs[i] = glyphStorage[markGlyph];
                glyphStorage.applyInsertions();
            } else {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(markGlyph, count + 1);
                insertGlyphs[0] = glyphStorage[markGlyph];
                for (i = 1; i < count + 1; i++, markIndex++) {
                    insertGlyphs[i] = insertionTable[markIndex];
                }
                glyphStorage.applyInsertions();
            } 
        }
    }

    if (currIndex > 0) {
        le_int16 count = flags & cgiCurrentInsertCountMask;
        if (!(flags & cgiCurrentIsKashidaLike)) {
            // extra glyph(s) will be added directly before/after the specified current glyph
            if (!(flags & cgiCurrentInsertBefore)) {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(currGlyph, count + 1);
                for (i = 0; i < count; i++, currIndex++) {
                    insertGlyphs[i] = insertionTable[currIndex];
                }
                insertGlyphs[i] = glyphStorage[currGlyph];
                glyphStorage.applyInsertions();
            } else {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(currGlyph, count + 1);
                insertGlyphs[0] = glyphStorage[currGlyph];
                for (i = 1; i < count + 1; i++, currIndex++) {
                    insertGlyphs[i] = insertionTable[currIndex];
                }
                glyphStorage.applyInsertions();
            }            
        } else {
            // inserted as a split-vowel-like insertion
            // extra glyph(s) will be inserted some distance away from the current glyph
            if (!(flags & cgiCurrentInsertBefore)) {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(currGlyph, count + 1);
                for (i = 0; i < count; i++, currIndex++) {
                    insertGlyphs[i] = insertionTable[currIndex];
                }
                insertGlyphs[i] = glyphStorage[currGlyph];
                glyphStorage.applyInsertions();
            } else {
                LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(currGlyph, count + 1);
                insertGlyphs[0] = glyphStorage[currGlyph];
                for (i = 1; i < count + 1; i++, currIndex++) {
                    insertGlyphs[i] = insertionTable[currIndex];
                }
                glyphStorage.applyInsertions();
            } 
        }
    }
    
    if (flags & cgiSetMark) {
        markGlyph = currGlyph;
    }

    if (!(flags & cgiDontAdvance)) {
        currGlyph += dir;
    }

    return newState;
}

void ContextualGlyphInsertionProcessor2::endStateTable()
{
}

U_NAMESPACE_END