Java tutorial
//package com.java2s; /* * Copyright (C) 2011 The Android Open Source Project * * 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.AlphaComposite; import java.awt.Graphics2D; import java.awt.Paint; import java.awt.image.BufferedImage; public class Main { /** * Fills the given {@link BufferedImage} with a {@link Paint}, preserving its alpha channel. * * @param source The source image. * @param paint The paint to fill with. * @return A new, painted/filled image. */ public static BufferedImage filledImage(BufferedImage source, Paint paint) { BufferedImage newImage = newArgbBufferedImage(source.getWidth(), source.getHeight()); Graphics2D g = (Graphics2D) newImage.getGraphics(); g.drawImage(source, 0, 0, null); g.setComposite(AlphaComposite.SrcAtop); g.setPaint(paint); g.fillRect(0, 0, source.getWidth(), source.getHeight()); return newImage; } /** * Creates a new ARGB {@link BufferedImage} of the given width and height. * * @param width The width of the new image. * @param height The height of the new image. * @return The newly created image. */ public static BufferedImage newArgbBufferedImage(int width, int height) { return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); } }