Java example source code file (DeviceTables.cpp)

This example Java source code file (DeviceTables.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

devicetable::fieldbits, devicetable\:\:fieldmasks, devicetable\:\:fieldsignbits, devicetable\:\:getadjustment, format_count, le_array_size, leerrorcode, lereferenceto, lereferencetoarrayof, swapw, u_namespace_begin, u_namespace_end

The DeviceTables.cpp Java example source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/*
 *
 *
 * (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};

#define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits)

le_int16 DeviceTable::getAdjustment(const LEReferenceTo<DeviceTable>&base, le_uint16 ppem, LEErrorCode &success) 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;

        LEReferenceToArrayOf<le_uint16> deltaValuesRef(base, success, deltaValues, (sizeIndex / count));

        if(LE_FAILURE(success)) {
          return result;
        }

        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