1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8005930 27 * @summary Thest verifies that color conversion does not distort 28 * alpha channel in the destination image. 29 * 30 * @run main AlphaTest 31 */ 32 33 import java.awt.AlphaComposite; 34 import java.awt.Color; 35 import java.awt.Graphics2D; 36 import java.awt.color.ColorSpace; 37 import java.awt.image.BufferedImage; 38 import java.awt.image.ColorConvertOp; 39 40 public class AlphaTest { main(String[] args)41 public static void main(String[] args) { 42 ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); 43 44 ColorConvertOp op = new ColorConvertOp(cs, null); 45 // create source image filled with an opaque color 46 BufferedImage src = createSrc(); 47 int srcAlpha = getAlpha(src); 48 49 System.out.printf("Src alpha: 0x%02x\n", srcAlpha); 50 51 // create clear (transparent black) destination image 52 BufferedImage dst = createDst(); 53 int dstAlpha = getAlpha(dst); 54 System.out.printf("Dst alpha: 0x%02x\n", dstAlpha); 55 56 57 dst = op.filter(src, dst); 58 dstAlpha = getAlpha(dst); 59 // we expect that destination image is opaque 60 // i.e. alpha is transferred from source to 61 // the destination 62 System.out.printf("Result alpha: 0x%02x\n", dstAlpha); 63 64 if (srcAlpha != dstAlpha) { 65 throw new RuntimeException("Test failed!"); 66 } 67 System.out.println("Test passed"); 68 } 69 createSrc()70 private static BufferedImage createSrc() { 71 BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); 72 73 Graphics2D g = img.createGraphics(); 74 g.setColor(Color.red); 75 g.fillRect(0, 0, w, h); 76 g.dispose(); 77 78 return img; 79 } 80 createDst()81 private static BufferedImage createDst() { 82 BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); 83 84 Graphics2D g = img.createGraphics(); 85 g.setComposite(AlphaComposite.Clear); 86 g.fillRect(0, 0, w, h); 87 g.dispose(); 88 89 return img; 90 } 91 getAlpha(BufferedImage img)92 private static int getAlpha(BufferedImage img) { 93 int argb = img.getRGB(w / 2, h / 2); 94 return 0xff & (argb >> 24); 95 } 96 97 private static final int w = 100; 98 private static final int h = 100; 99 } 100