/*

  * @(#)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