2 * @(#)DeviceTables.cpp 1.5 00/03/15
4 * (C) Copyright IBM Corp. 1998 - 2006 - All Rights Reserved
9 #include "OpenTypeTables.h"
10 #include "DeviceTables.h"
15 const le_uint16 DeviceTable::fieldMasks[] = {0x0003, 0x000F, 0x00FF};
16 const le_uint16 DeviceTable::fieldSignBits[] = {0x0002, 0x0008, 0x0080};
17 const le_uint16 DeviceTable::fieldBits[] = { 2, 4, 8};
19 #define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits)
21 le_int16 DeviceTable::getAdjustment(le_uint16 ppem) const
23 le_uint16 start = SWAPW(startSize);
24 le_uint16 format = SWAPW(deltaFormat) - 1;
27 if (ppem >= start && ppem <= SWAPW(endSize) && format < FORMAT_COUNT) {
28 le_uint16 sizeIndex = ppem - start;
29 le_uint16 bits = fieldBits[format];
30 le_uint16 count = 16 / bits;
31 le_uint16 word = SWAPW(deltaValues[sizeIndex / count]);
32 le_uint16 fieldIndex = sizeIndex % count;
33 le_uint16 shift = 16 - (bits * (fieldIndex + 1));
34 le_uint16 field = (word >> shift) & fieldMasks[format];
38 if ((field & fieldSignBits[format]) != 0) {
39 result |= ~ fieldMasks[format];