/* * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 8191431 * @summary Test verifies that whether we can use same PNGImageReader instance * to read multiple images or not. It also verifies whether * imageStartPosition in PNGImageReader is updated properly when we * use same PNGImageReader instance to read multiple images. * @run main PngMultipleImageReadTest */ import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.awt.image.IndexColorModel; import java.io.File; import java.io.IOException; import java.nio.file.Files; import javax.imageio.ImageIO; import javax.imageio.ImageReadParam; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; public class PngMultipleImageReadTest { private static final ImageReader PNG_READER = ImageIO.getImageReadersByMIMEType("image/png").next(); public static void main(String[] args) throws IOException { /* * First we create a PNG image without palette so that the IDAT * start position in the stream is at some position 'x'. */ BufferedImage imageWithoutPalette = new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB); Graphics2D g1 = imageWithoutPalette.createGraphics(); g1.setColor(Color.WHITE); g1.fillRect(0, 0, 20, 20); g1.dispose(); writeAndReadImageWithoutPalette(imageWithoutPalette); /* * We create another PNG image with PLTE(palette) chunk so that * now the IDAT start position is at some 'x + y'. */ IndexColorModel cm = new IndexColorModel( 3, 1, new byte[]{10}, // r new byte[]{10}, // g new byte[]{10}); // b BufferedImage imageWithPalette = new BufferedImage( 10, 10, BufferedImage.TYPE_BYTE_INDEXED, cm); Graphics2D g2 = imageWithPalette.createGraphics(); g2.setColor(Color.BLACK); g2.fillRect(0, 0, 10, 10); g2.dispose(); writeAndReadImageWithPalette(imageWithPalette); } private static void writeAndReadImageWithoutPalette(BufferedImage image) throws IOException { File output = File.createTempFile("output", ".png"); ImageInputStream stream = null; try { ImageIO.write(image, "png", output); stream = ImageIO.createImageInputStream(output); ImageReadParam param = PNG_READER.getDefaultReadParam(); PNG_READER.setInput(stream, true, true); PNG_READER.read(0, param); } finally { if (stream != null) { stream.close(); } Files.delete(output.toPath()); } } private static void writeAndReadImageWithPalette(BufferedImage image) throws IOException { File output = File.createTempFile("output", ".png"); ImageInputStream stream = null; try { ImageIO.write(image, "png", output); stream = ImageIO.createImageInputStream(output); ImageReadParam param = PNG_READER.getDefaultReadParam(); PNG_READER.setInput(stream, true, true); PNG_READER.read(0, param); } finally { if (stream != null) { stream.close(); } Files.delete(output.toPath()); } } }