/*

 * @(#)DeviceTables.cpp 1.5 00/03/15

 *

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

 *

 */

#include "LETypes.h"

#include "OpenTypeTables.h"

#include "DeviceTables.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

const le_uint16 DeviceTable::fieldMasks[]    = {0x0003, 0x000F, 0x00FF};

const le_uint16 DeviceTable::fieldSignBits[] = {0x0002, 0x0008, 0x0080};

const le_uint16 DeviceTable::fieldBits[]     = {     2,      4,      8};

le_int16 DeviceTable::getAdjustment(le_uint16 ppem) const

{

    le_uint16 start = SWAPW(startSize);

    le_uint16 format = SWAPW(deltaFormat) - 1;

    le_int16 result = 0;

    if (ppem >= start && ppem <= SWAPW(endSize)) {

        le_uint16 sizeIndex = ppem - start;

        le_uint16 bits = fieldBits[format];

        le_uint16 count = 16 / bits;

        le_uint16 word = SWAPW(deltaValues[sizeIndex / count]);

        le_uint16 fieldIndex = sizeIndex % count;

        le_uint16 shift = 16 - (bits * (fieldIndex + 1));

        le_uint16 field = (word >> shift) & fieldMasks[format];

        result = field;

        if ((field & fieldSignBits[format]) != 0) {

            result |= ~ fieldMasks[format];

        }

    }

    return result;

}

U_NAMESPACE_END