--- /dev/null 2018-04-13 12:23:36.988791000 +0530 +++ new/test/jdk/javax/imageio/plugins/png/ReadPngRGBImageWithTRNSChunk.java 2018-04-13 12:29:32.156779000 +0530 @@ -0,0 +1,203 @@ +/* + * 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 RGB PNG images. + * @run main ReadPngRGBImageWithTRNSChunk + */ + +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; +import java.awt.image.DataBuffer; +import java.awt.image.DataBufferUShort; +import java.awt.image.WritableRaster; +import java.awt.image.Raster; +import java.awt.color.ColorSpace; +import java.awt.image.ColorModel; +import java.awt.image.ComponentColorModel; +import java.awt.Transparency; + +public class ReadPngRGBImageWithTRNSChunk { + + private static BufferedImage img; + private static IIOMetadata metadata; + private static ImageWriteParam param; + private static ImageWriter writer; + private static byte[] imageByteArray; + + private static void createTRNSNode(String tRNS_value) + throws IIOInvalidTreeException { + IIOMetadataNode tRNS_rgb = new IIOMetadataNode("tRNS_RGB"); + tRNS_rgb.setAttribute("red", tRNS_value); + tRNS_rgb.setAttribute("green", tRNS_value); + tRNS_rgb.setAttribute("blue", tRNS_value); + + IIOMetadataNode tRNS = new IIOMetadataNode("tRNS"); + tRNS.appendChild(tRNS_rgb); + 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 read8BitRGBPNGWithTRNSChunk() throws IOException { + int width = 2; + int height = 1; + // Create 8 bit PNG image + img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR); + Graphics2D g2D = img.createGraphics(); + + // transparent first pixel + g2D.setColor(Color.WHITE); + g2D.fillRect(0, 0, 1, 1); + // non-transparent second pixel + g2D.setColor(Color.RED); + g2D.fillRect(1, 0, 1, 1); + g2D.dispose(); + + Iterator iterWriter = + ImageIO.getImageWritersBySuffix("png"); + writer = iterWriter.next(); + + param = writer.getDefaultWriteParam(); + ImageTypeSpecifier specifier = + ImageTypeSpecifier. + createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR); + metadata = writer.getDefaultImageMetadata(specifier, param); + + // Create tRNS node and merge it with default metadata + createTRNSNode("255"); + + writeImage(); + + InputStream input= new ByteArrayInputStream(imageByteArray); + // Read 8 bit PNG RGB 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 read16BitRGBPNGWithTRNSChunk() throws IOException { + // Create 16 bit PNG image + int height = 1; + int width = 2; + int numBands = 3; + int shortArrayLength = width * height * numBands; + short[] pixelData = new short[shortArrayLength]; + // transparent first pixel + pixelData[0] = (short)0xffff; + pixelData[1] = (short)0xffff; + pixelData[2] = (short)0xffff; + // non-transparent second pixel + pixelData[3] = (short)0xffff; + pixelData[4] = (short)0xffff; + pixelData[5] = (short)0xfffe; + + DataBuffer buffer = new DataBufferUShort(pixelData, shortArrayLength); + + int[] bandOffset = {0, 1 ,2}; + WritableRaster ras = + Raster.createInterleavedRaster(buffer, width, height, + width * numBands, numBands, bandOffset, null); + + int nBits[] = {16, 16 ,16}; + ColorModel colorModel = new + ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB), + nBits, false, false, Transparency.OPAQUE, + DataBuffer.TYPE_USHORT); + img = new BufferedImage(colorModel, ras, false, null); + + Iterator iterWriter = + ImageIO.getImageWritersBySuffix("png"); + writer = iterWriter.next(); + + param = writer.getDefaultWriteParam(); + ImageTypeSpecifier specifier = new ImageTypeSpecifier(img); + metadata = writer.getDefaultImageMetadata(specifier, param); + + // Create tRNS node and merge it with default metadata + createTRNSNode("65535"); + + writeImage(); + + InputStream input= new ByteArrayInputStream(imageByteArray); + // Read 16 bit PNG RGB 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 RGB image with tRNS chunk + read8BitFail = read8BitRGBPNGWithTRNSChunk(); + + // read 16 bit PNG RGB image with tRNS chunk + read16BitFail = read16BitRGBPNGWithTRNSChunk(); + + if (read8BitFail || read16BitFail) { + throw new RuntimeException("PNGImageReader is not using" + + " transparent pixel information from tRNS chunk properly"); + } + } +} +