| /* |
| * 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))); |
| } |
| } |