Here you can find the source of iconToImage(@Nonnull Component context, @Nullable final Icon icon)
@Nonnull public static Image iconToImage(@Nonnull Component context, @Nullable final Icon icon)
//package com.java2s; /*// ww w . j a v a 2s . c o m * Copyright 2016 Igor Maznitsa. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.awt.Component; import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import javax.annotation.Nonnull; import javax.annotation.Nullable; import javax.swing.Icon; import javax.swing.ImageIcon; public class Main { @Nonnull public static Image iconToImage(@Nonnull Component context, @Nullable final Icon icon) { if (icon instanceof ImageIcon) { return ((ImageIcon) icon).getImage(); } final int width = icon == null ? 16 : icon.getIconWidth(); final int height = icon == null ? 16 : icon.getIconHeight(); final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); if (icon != null) { final Graphics g = image.getGraphics(); try { icon.paintIcon(context, g, 0, 0); } finally { g.dispose(); } } return image; } }