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