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/*
* Copyright (c) 2018, 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 6788458
* @summary Test verifies that PNGImageReader takes tRNS chunk values
* into consideration while reading non-indexed Gray PNG images.
* @run main ReadPngGrayImageWithTRNSChunk
*/
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.Color;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriter;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.IIOImage;
public class ReadPngGrayImageWithTRNSChunk {
private static BufferedImage img;
private static ImageWriter writer;
private static ImageWriteParam param;
private static IIOMetadata metadata;
private static byte[] imageByteArray;
private static void initialize(int type) {
int width = 2;
int height = 1;
img = new BufferedImage(width, height, type);
Graphics2D g2D = img.createGraphics();
// transparent first pixel
g2D.setColor(new Color(255, 255, 255));
g2D.fillRect(0, 0, 1, 1);
// non-transparent second pixel
g2D.setColor(new Color(128, 128,128));
g2D.fillRect(1, 0, 1, 1);
g2D.dispose();
Iterator<ImageWriter> iterWriter =
ImageIO.getImageWritersBySuffix("png");
writer = iterWriter.next();
param = writer.getDefaultWriteParam();
ImageTypeSpecifier specifier =
ImageTypeSpecifier.
createFromBufferedImageType(type);
metadata = writer.getDefaultImageMetadata(specifier, param);
}
private static void createTRNSNode(String tRNS_value)
throws IIOInvalidTreeException {
IIOMetadataNode tRNS_gray = new IIOMetadataNode("tRNS_Grayscale");
tRNS_gray.setAttribute("gray", tRNS_value);
IIOMetadataNode tRNS = new IIOMetadataNode("tRNS");
tRNS.appendChild(tRNS_gray);
IIOMetadataNode root = new IIOMetadataNode("javax_imageio_png_1.0");
root.appendChild(tRNS);
metadata.mergeTree("javax_imageio_png_1.0", root);
}
private static void writeImage() throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
writer.setOutput(ios);
writer.write(metadata, new IIOImage(img, null, metadata), param);
writer.dispose();
baos.flush();
imageByteArray = baos.toByteArray();
baos.close();
}
private static boolean verifyAlphaValue(BufferedImage img) {
Color firstPixel = new Color(img.getRGB(0, 0), true);
Color secondPixel = new Color(img.getRGB(1, 0), true);
return firstPixel.getAlpha() != 0 ||
secondPixel.getAlpha() != 255;
}
private static boolean read8BitGrayPNGWithTRNSChunk() throws IOException {
initialize(BufferedImage.TYPE_BYTE_GRAY);
// Create tRNS node and merge it with default metadata
createTRNSNode("255");
writeImage();
InputStream input= new ByteArrayInputStream(imageByteArray);
// Read 8 bit PNG Gray image with tRNS chunk
BufferedImage verify_img = ImageIO.read(input);
input.close();
// Verify alpha values present in first & second pixel
return verifyAlphaValue(verify_img);
}
private static boolean read16BitGrayPNGWithTRNSChunk() throws IOException {
initialize(BufferedImage.TYPE_USHORT_GRAY);
// Create tRNS node and merge it with default metadata
createTRNSNode("65535");
writeImage();
InputStream input= new ByteArrayInputStream(imageByteArray);
// Read 16 bit PNG Gray image with tRNS chunk
BufferedImage verify_img = ImageIO.read(input);
input.close();
// Verify alpha values present in first & second pixel
return verifyAlphaValue(verify_img);
}
public static void main(String[] args) throws IOException {
boolean read8BitFail, read16BitFail;
// read 8 bit PNG Gray image with tRNS chunk
read8BitFail = read8BitGrayPNGWithTRNSChunk();
// read 16 bit PNG Gray image with tRNS chunk
read16BitFail = read16BitGrayPNGWithTRNSChunk();
if (read8BitFail || read16BitFail) {
throw new RuntimeException("PNGImageReader is not using" +
" transparent pixel information from tRNS chunk properly");
}
}
}
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