| /* |
| * @(#)DeviceTables.cpp 1.5 00/03/15 |
| * |
| * (C) Copyright IBM Corp. 1998 - 2006 - 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}; |
| |
| #define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits) |
| |
| 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) && format < FORMAT_COUNT) { |
| 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 |
