Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\css\parser\DeriveSizeConverter.java

/*
 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.css.parser;

import com.sun.javafx.css.Size;
import com.sun.javafx.css.SizeUnits;
import com.sun.javafx.css.StyleConverterImpl;
import javafx.css.ParsedValue;
import javafx.scene.text.Font;

/**
 * A type that combines two Size values.  The primary purpose of
 * this type is to handle "convert(size1, size2)" expressions in CSS.
 */
public final class DeriveSizeConverter extends StyleConverterImpl<ParsedValue<Size, Size>[], Size> {

// lazy, thread-safe instatiation
    private static class Holder {
        static final DeriveSizeConverter INSTANCE = new DeriveSizeConverter();
    }

public static DeriveSizeConverter getInstance() {
        return Holder.INSTANCE;
    }

private DeriveSizeConverter() {
        super();
    }

@Override
    public Size convert(ParsedValue<ParsedValue<Size, Size>[], Size> value, Font font) {
        final ParsedValue<Size, Size>[] sizes = value.getValue();
        final double px1 = sizes[0].convert(font).pixels(font);
        final double px2 = sizes[1].convert(font).pixels(font);
        return new Size(px1 + px2, SizeUnits.PX);
    }

@Override
    public String toString() {
        return "DeriveSizeConverter";
    }
}

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