1 /* 2 * Copyright (c) 2017, 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 8191431 27 * @summary Test verifies that whether we can use same PNGImageReader instance 28 * to read multiple images or not. It also verifies whether 29 * imageStartPosition in PNGImageReader is updated properly when we 30 * use same PNGImageReader instance to read multiple images. 31 * @run main PngMultipleImageReadTest 32 */ 33 34 import java.awt.Color; 35 import java.awt.Graphics2D; 36 import java.awt.image.BufferedImage; 37 import java.awt.image.IndexColorModel; 38 import java.io.File; 39 import java.io.IOException; 40 import java.nio.file.Files; 41 import javax.imageio.ImageIO; 42 import javax.imageio.ImageReadParam; 43 import javax.imageio.ImageReader; 44 import javax.imageio.stream.ImageInputStream; 45 46 public class PngMultipleImageReadTest { 47 48 private static final ImageReader PNG_READER = 49 ImageIO.getImageReadersByMIMEType("image/png").next(); 50 51 public static void main(String[] args) throws IOException { 52 53 /* 54 * First we create a PNG image without palette so that the IDAT 55 * start position in the stream is at some position 'x'. 56 */ 57 BufferedImage imageWithoutPalette = 58 new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB); 59 Graphics2D g1 = imageWithoutPalette.createGraphics(); 60 g1.setColor(Color.WHITE); 61 g1.fillRect(0, 0, 20, 20); 62 g1.dispose(); 63 // write and read the image without palette 64 writeAndReadImage(imageWithoutPalette); 65 66 /* 67 * We create another PNG image with PLTE(palette) chunk so that 68 * now the IDAT start position is at some 'x + y'. 69 */ 70 IndexColorModel cm = new IndexColorModel( 71 3, 72 1, 73 new byte[]{10}, // r 74 new byte[]{10}, // g 75 new byte[]{10}); // b 76 BufferedImage imageWithPalette = new BufferedImage( 77 10, 10, 78 BufferedImage.TYPE_BYTE_INDEXED, 79 cm); 80 Graphics2D g2 = imageWithPalette.createGraphics(); 81 g2.setColor(Color.BLACK); 82 g2.fillRect(0, 0, 10, 10); 83 g2.dispose(); 84 // write and read the image with palette 85 writeAndReadImage(imageWithPalette); 86 } 87 88 private static void writeAndReadImage(BufferedImage image) 89 throws IOException { 90 File output = File.createTempFile("output", ".png"); 91 ImageInputStream stream = null; 92 try { 93 ImageIO.write(image, "png", output); 94 95 stream = ImageIO.createImageInputStream(output); 96 ImageReadParam param = PNG_READER.getDefaultReadParam(); 97 PNG_READER.setInput(stream, true, true); 98 PNG_READER.read(0, param); 99 } finally { 100 if (stream != null) { 101 stream.close(); 102 } 103 Files.delete(output.toPath()); 104 } 105 } 106 } 107