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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * 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.
 */

package com.sun.javafx.scene.layout.region;

import javafx.css.ParsedValue;
import com.sun.javafx.css.Size;
import com.sun.javafx.css.SizeUnits;
import com.sun.javafx.css.StyleConverterImpl;
import com.sun.javafx.css.converters.BooleanConverter;
import javafx.scene.layout.BackgroundSize;
import javafx.scene.text.Font;

/**
 */
public final class BackgroundSizeConverter  extends StyleConverterImpl {
    private static final BackgroundSizeConverter BACKGROUND_SIZE_CONVERTER =
            new BackgroundSizeConverter();

    public static BackgroundSizeConverter getInstance() {
        return BACKGROUND_SIZE_CONVERTER;
    }

    // Disallow instantiation
    private BackgroundSizeConverter() { }

    @Override
    public BackgroundSize convert(ParsedValue value, Font font) {
        ParsedValue[] values = value.getValue();

        // A Size that is null represents that we are "auto" for that dimension
        final Size wSize = (values[0] != null)
                ? ((ParsedValue) values[0]).convert(font) : null;
        final Size hSize = (values[1] != null)
                ? ((ParsedValue) values[1]).convert(font) : null;

        boolean proportionalWidth = true;
        boolean proportionalHeight = true;

        if (wSize != null) {
            proportionalWidth = wSize.getUnits() == SizeUnits.PERCENT;
        }
        if (hSize != null) {
            // wSize will be null if wSize is AUTO
            proportionalHeight = hSize.getUnits() == SizeUnits.PERCENT;
        }

        double w = (wSize != null) ? wSize.pixels(font) : BackgroundSize.AUTO;
        double h = (hSize != null) ? hSize.pixels(font) : BackgroundSize.AUTO;

        boolean cover = (values[2] != null)
                ? BooleanConverter.getInstance().convert(values[2], font) : false;

        boolean contain = (values[3] != null)
                ? BooleanConverter.getInstance().convert(values[3], font) : false;

        return new BackgroundSize(w, h, proportionalWidth, proportionalHeight, contain, cover);
    }

    /**
     * @inheritDoc
     */
    @Override public String toString() {
        return "BackgroundSizeConverter";
    }
}