1 /* 2 * Copyright (c) 2018, 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 6788458 27 * @summary Test verifies that PNGImageReader takes tRNS chunk values 28 * into consideration while reading non-indexed Gray PNG images. 29 * @run main ReadPngGrayImageWithTRNSChunk 30 */ 31 32 import java.awt.Graphics2D; 33 import java.awt.image.BufferedImage; 34 import java.awt.Color; 35 import java.io.File; 36 import java.io.IOException; 37 import java.nio.file.Files; 38 import java.util.Iterator; 39 import javax.imageio.ImageTypeSpecifier; 40 import javax.imageio.ImageWriter; 41 import javax.imageio.ImageIO; 42 import javax.imageio.ImageWriteParam; 43 import javax.imageio.metadata.IIOMetadata; 44 import javax.imageio.metadata.IIOMetadataNode; 45 import javax.imageio.stream.ImageOutputStream; 46 import javax.imageio.IIOImage; 47 48 public class ReadPngGrayImageWithTRNSChunk { 49 50 private static ImageOutputStream ios; 51 private static File output; 52 private static IIOMetadataNode root; 53 private static BufferedImage img; 54 private static ImageWriter writer; 55 private static ImageWriteParam param; 56 private static IIOMetadata metadata; 57 58 private static void initialize(int type) { 59 int width = 2; 60 int height = 1; 61 img = new BufferedImage(width, height, type); 62 Graphics2D g2D = img.createGraphics(); 63 64 // transparent first pixel 65 g2D.setColor(new Color(255, 255, 255)); 66 g2D.fillRect(0, 0, 1, 1); 67 // non-transparent second pixel 68 g2D.setColor(new Color(128, 128,128)); 69 g2D.fillRect(1, 0, 1, 1); 70 g2D.dispose(); 71 72 Iterator<ImageWriter> iterWriter = 73 ImageIO.getImageWritersBySuffix("png"); 74 writer = iterWriter.next(); 75 76 param = writer.getDefaultWriteParam(); 77 ImageTypeSpecifier specifier = 78 ImageTypeSpecifier. 79 createFromBufferedImageType(type); 80 metadata = writer.getDefaultImageMetadata(specifier, param); 81 } 82 83 private static void createOutputStream() throws IOException { 84 String dir = System.getProperty("test.src"); 85 String sep = System.getProperty("file.separator"); 86 String filePath = dir + sep; 87 File directory = new File(filePath); 88 output = File.createTempFile("output", "png", directory); 89 ios = ImageIO.createImageOutputStream(output); 90 } 91 92 private static void createTRNSNode(String tRNS_value) { 93 IIOMetadataNode tRNS_gray = new IIOMetadataNode("tRNS_Grayscale"); 94 tRNS_gray.setAttribute("gray", tRNS_value); 95 96 IIOMetadataNode tRNS = new IIOMetadataNode("tRNS"); 97 tRNS.appendChild(tRNS_gray); 98 root = new IIOMetadataNode("javax_imageio_png_1.0"); 99 root.appendChild(tRNS); 100 } 101 102 private static boolean verifyAlphaValue(BufferedImage img) { 103 Color firstPixel = new Color(img.getRGB(0, 0), true); 104 Color secondPixel = new Color(img.getRGB(1, 0), true); 105 106 return firstPixel.getAlpha() != 0 || 107 secondPixel.getAlpha() != 255; 108 } 109 110 private static boolean read8BitGrayPNGWithTRNSChunk() throws IOException { 111 initialize(BufferedImage.TYPE_BYTE_GRAY); 112 // Create tRNS node and merge it with default metadata 113 createTRNSNode("255"); 114 115 metadata.mergeTree("javax_imageio_png_1.0", root); 116 117 writer.setOutput(ios); 118 119 writer.write(metadata, new IIOImage(img, null, metadata), param); 120 writer.dispose(); 121 122 // Read 8 bit PNG Gray image with tRNS chunk 123 BufferedImage display_img = ImageIO.read(output); 124 // Verify alpha values present in first & second pixel 125 return verifyAlphaValue(display_img); 126 } 127 128 private static boolean read16BitGrayPNGWithTRNSChunk() throws IOException { 129 initialize(BufferedImage.TYPE_USHORT_GRAY); 130 // Create tRNS node and merge it with default metadata 131 createTRNSNode("65535"); 132 133 metadata.mergeTree("javax_imageio_png_1.0", root); 134 135 writer.setOutput(ios); 136 137 writer.write(metadata, new IIOImage(img, null, metadata), param); 138 writer.dispose(); 139 140 // Read 16 bit PNG Gray image with tRNS chunk 141 BufferedImage display_img = ImageIO.read(output); 142 // Verify alpha values present in first & second pixel 143 return verifyAlphaValue(display_img); 144 } 145 146 public static void main(String[] args) throws IOException { 147 // read 8 bit PNG Gray image with tRNS chunk 148 boolean read8BitFail, read16BitFail; 149 try { 150 createOutputStream(); 151 read8BitFail = read8BitGrayPNGWithTRNSChunk(); 152 } finally { 153 if (ios != null) { 154 ios.close(); 155 } 156 if (output != null) { 157 Files.delete(output.toPath()); 158 } 159 } 160 161 // read 16 bit PNG Gray image with tRNS chunk 162 try { 163 createOutputStream(); 164 read16BitFail = read16BitGrayPNGWithTRNSChunk(); 165 } finally { 166 if (ios != null) { 167 ios.close(); 168 } 169 if (output != null) { 170 Files.delete(output.toPath()); 171 } 172 } 173 174 if (read8BitFail || read16BitFail) { 175 throw new RuntimeException("PNGImageReader is not using" + 176 " transparent pixel information from tRNS chunk properly"); 177 } 178 } 179 } 180