Java example source code file (LEFontInstance.cpp)

This example Java source code file (LEFontInstance.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

le_illegal_argument_error, lecharmapper, lefontinstance, lefontinstance\:\:getsubfont, lefontinstance\:\:mapchartoglyph, lefontinstance\:\:transformfunits, lefontinstance\:\:unitstopoints, leglyphid, lepoint, leunicode16, leunicode32, null, true, u_namespace_end

The LEFontInstance.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.
 *
 */

/*
 *******************************************************************************
 *
 *   Copyright (C) 1999-2007, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  LEFontInstance.cpp
 *
 *   created on: 02/06/2003
 *   created by: Eric R. Mader
 */

#include "LETypes.h"
#include "LEScripts.h"
#include "LEFontInstance.h"
#include "LEGlyphStorage.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)

LECharMapper::~LECharMapper()
{
    // nothing to do.
}

LEFontInstance::~LEFontInstance()
{
    // nothing to do
}

const LEFontInstance *LEFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit,
                                                       le_int32 script, LEErrorCode &success) const
{
    if (LE_FAILURE(success)) {
        return NULL;
    }

    if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return NULL;
    }

    *offset = limit;
    return this;
}

void LEFontInstance::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count,
                                      le_bool reverse, const LECharMapper *mapper, le_bool filterZeroWidth, LEGlyphStorage &glyphStorage) const
{
    le_int32 i, out = 0, dir = 1;

    if (reverse) {
        out = count - 1;
        dir = -1;
    }

    for (i = offset; i < offset + count; i += 1, out += dir) {
        LEUnicode16 high = chars[i];
        LEUnicode32 code = high;

        if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {
            LEUnicode16 low = chars[i + 1];

            if (low >= 0xDC00 && low <= 0xDFFF) {
                code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
            }
        }

        glyphStorage[out] = mapCharToGlyph(code, mapper, filterZeroWidth);

        if (code >= 0x10000) {
            i += 1;
            glyphStorage[out += dir] = 0xFFFF;
        }
    }
}

LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
{
    return mapCharToGlyph(ch, mapper, TRUE);
}

LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const
{
    LEUnicode32 mappedChar = mapper->mapChar(ch);

    if (mappedChar == 0xFFFE || mappedChar == 0xFFFF) {
        return 0xFFFF;
    }

    if (filterZeroWidth && (mappedChar == 0x200C || mappedChar == 0x200D)) {
        return canDisplay(mappedChar)? 0x0001 : 0xFFFF;
    }

    return mapCharToGlyph(mappedChar);
}

le_bool LEFontInstance::canDisplay(LEUnicode32 ch) const
{
    return LE_GET_GLYPH(mapCharToGlyph(ch)) != 0;
}

float LEFontInstance::xUnitsToPoints(float xUnits) const
{
    return (xUnits * getXPixelsPerEm()) / (float) getUnitsPerEM();
}

float LEFontInstance::yUnitsToPoints(float yUnits) const
{
    return (yUnits * getYPixelsPerEm()) / (float) getUnitsPerEM();
}

void LEFontInstance::unitsToPoints(LEPoint &units, LEPoint &points) const
{
    points.fX = xUnitsToPoints(units.fX);
    points.fY = yUnitsToPoints(units.fY);
}

float LEFontInstance::xPixelsToUnits(float xPixels) const
{
    return (xPixels * getUnitsPerEM()) / (float) getXPixelsPerEm();
}

float LEFontInstance::yPixelsToUnits(float yPixels) const
{
    return (yPixels * getUnitsPerEM()) / (float) getYPixelsPerEm();
}

void LEFontInstance::pixelsToUnits(LEPoint &pixels, LEPoint &units) const
{
    units.fX = xPixelsToUnits(pixels.fX);
    units.fY = yPixelsToUnits(pixels.fY);
}

void LEFontInstance::transformFunits(float xFunits, float yFunits, LEPoint &pixels) const
{
    pixels.fX = xUnitsToPoints(xFunits) * getScaleFactorX();
    pixels.fY = yUnitsToPoints(yFunits) * getScaleFactorY();
}

le_int32 LEFontInstance::getLineHeight() const
{
    return getAscent() + getDescent() + getLeading();
}

U_NAMESPACE_END