/*

 *

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

 *

 */

#include "LETypes.h"

#include "LEFontInstance.h"

#include "OpenTypeTables.h"

#include "GlyphPositioningTables.h"

#include "PairPositioningSubtables.h"

#include "ValueRecords.h"

#include "GlyphIterator.h"

#include "OpenTypeUtilities.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

le_uint32 PairPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

{

    switch(SWAPW(subtableFormat))

    {

    case 0:

        return 0;

    case 1:

    {

        const PairPositioningFormat1Subtable *subtable = (const PairPositioningFormat1Subtable *) this;

        return subtable->process(glyphIterator, fontInstance);

    }

    case 2:

    {

        const PairPositioningFormat2Subtable *subtable = (const PairPositioningFormat2Subtable *) this;

        return subtable->process(glyphIterator, fontInstance);

    }

    default:

        return 0;

    }

}

le_uint32 PairPositioningFormat1Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

{

    LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();

    le_int32 coverageIndex = getGlyphCoverage(firstGlyph);

    GlyphIterator tempIterator(*glyphIterator);

    if (coverageIndex >= 0 && glyphIterator->next()) {

        Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);

        PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);

        le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);

        le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));

        le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));

        le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;

        LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();

        const PairValueRecord *pairValueRecord = NULL;

        if (pairValueCount != 0) {

            pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);

        }

        if (pairValueRecord == NULL) {

            return 0;

        }

        if (valueFormat1 != 0) {

            pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);

        }

        if (valueFormat2 != 0) {

            const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);

            valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);

        }

        return 2;

    }

    return 0;

}

le_uint32 PairPositioningFormat2Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

{

    LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();

    le_int32 coverageIndex = getGlyphCoverage(firstGlyph);

    GlyphIterator tempIterator(*glyphIterator);

    if (coverageIndex >= 0 && glyphIterator->next()) {

        LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();

        const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));

        const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));

        le_int32 class1 = classDef1->getGlyphClass(firstGlyph);

        le_int32 class2 = classDef2->getGlyphClass(secondGlyph);

        le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));

        le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));

        le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;

        le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);

        const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));

        const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));

        if (valueFormat1 != 0) {

            class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);

        }

        if (valueFormat2 != 0) {

            const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);

            valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);

        }

        return 2;

    }

    return 0;

}

const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const

{

    le_uint8 bit = OpenTypeUtilities::highBit(recordCount);

    le_uint16 power = 1 << bit;

    le_uint16 extra = (recordCount - power) * recordSize;

    le_uint16 probe = power * recordSize;

    const PairValueRecord *record = records;

    const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);

    if (SWAPW(trial->secondGlyph) <= glyphID) {

        record = trial;

    }

    while (probe > recordSize) {

        probe >>= 1;

        trial = (const PairValueRecord *) ((char *) record + probe);

        if (SWAPW(trial->secondGlyph) <= glyphID) {

            record = trial;

        }

    }

    if (SWAPW(record->secondGlyph) == glyphID) {

        return record;

    }

    return NULL;

}

U_NAMESPACE_END