/* * Copyright (c) 2003, 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 4888478 * @summary Test that colors do not distort when buffered image with * premultiplied alpha is encoded to png format */ import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import javax.imageio.ImageIO; public class PngPremultAlphaTest { protected static int width = 100; protected static int height = 100; protected static String format = "png"; protected static int[] iBufferedImageTypes = { BufferedImage.TYPE_INT_RGB, BufferedImage.TYPE_INT_ARGB, BufferedImage.TYPE_4BYTE_ABGR_PRE, BufferedImage.TYPE_INT_ARGB_PRE }; protected static String[] strBufferedImageTypes = { "TYPE_INT_RGB", "TYPE_INT_ARGB", "BufferedImage.TYPE_4BYTE_ABGR_PRE", "BufferedImage.TYPE_INT_ARGB_PRE" }; public static void main(String[] arg) { for(int i=0; i<iBufferedImageTypes.length; i++) { System.out.println("Test for " + strBufferedImageTypes[i]); doTest(iBufferedImageTypes[i]); } } public static void doTest(int type) { try { BufferedImage src = new BufferedImage(100, 100, type); Graphics2D g = src.createGraphics(); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f)); g.setColor(new Color(0x20, 0x40, 0x60)); g.fillRect(0,0,100,100); int[] samples = new int[src.getData().getNumBands()]; src.getData().getPixels(0,0,1,1,samples); for(int i=0; i<samples.length; i++) { System.out.println("sample["+i+"]="+Integer.toHexString(samples[i])); } ByteArrayOutputStream baos = new ByteArrayOutputStream(); ImageIO.write(src, format, baos); baos.close(); ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); BufferedImage dst = ImageIO.read(bais); isSameColors(src, dst); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("Test failed."); } } private static boolean isSameColors(BufferedImage src, BufferedImage dst) { Object dstPixel = dst.getRaster().getDataElements(width/2, height/2, null); Object srcPixel = src.getRaster().getDataElements(width/2, height/2, null); // take into account the rounding error if ( Math.abs(src.getColorModel().getRed(srcPixel) - dst.getColorModel().getRed(dstPixel)) > 1 || Math.abs(src.getColorModel().getGreen(srcPixel) - dst.getColorModel().getGreen(dstPixel)) > 1 || Math.abs(src.getColorModel().getBlue(srcPixel) - dst.getColorModel().getBlue(dstPixel)) > 1) { showPixel(src, width/2, height/2); showPixel(dst, width/2, height/2); throw new RuntimeException( "Colors are different: " + Integer.toHexString(src.getColorModel().getRGB(srcPixel)) + " and " + Integer.toHexString(dst.getColorModel().getRGB(dstPixel))); } return true; } private static void showPixel(BufferedImage src, int x, int y) { System.out.println("Img is " + src); System.out.println("CM is " + src.getColorModel().getClass().getName()); Object p = src.getRaster().getDataElements(x, y, null); System.out.println("RGB: " + Integer.toHexString(src.getColorModel().getRGB(p))); System.out.println("Red: " + Integer.toHexString(src.getColorModel().getRed(p))); System.out.println("Green: " + Integer.toHexString(src.getColorModel().getGreen(p))); System.out.println("Blue: " + Integer.toHexString(src.getColorModel().getBlue(p))); System.out.println("Alpha: " + Integer.toHexString(src.getColorModel().getAlpha(p))); } }