1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.awt.AlphaComposite; 25 import java.awt.BasicStroke; 26 import java.awt.Color; 27 import java.awt.Graphics2D; 28 import java.awt.Rectangle; 29 import java.awt.geom.Area; 30 import java.awt.image.BufferedImage; 31 import java.io.File; 32 33 import javax.imageio.ImageIO; 34 35 import static java.awt.RenderingHints.KEY_STROKE_CONTROL; 36 import static java.awt.RenderingHints.VALUE_STROKE_PURE; 37 import static java.awt.image.BufferedImage.TYPE_INT_ARGB; 38 39 /** 40 * @test 41 * @key headful 42 * @bug 8167310 43 * @summary The clip should be correct if the scale is fractional 44 */ 45 public final class IncorrectFractionalClip { 46 47 private static final int SIZE = 128; 48 49 public static final Color RED = new Color(255, 0, 0, 100); 50 51 public static final Color GREEN = new Color(0, 255, 0, 100); 52 53 public static final Color WHITE = new Color(0, 0, 0, 0); 54 55 public static final BasicStroke STROKE = new BasicStroke(2.01f); 56 57 private static final double[] SCALES = { 58 0.1, 0.25, 0.4, 0.5, 0.6, 1, 1.4, 1.5, 1.6, 2.0, 2.4, 2.5, 2.6, 4 59 }; 60 61 static BufferedImage bi; 62 63 static BufferedImage gold; 64 65 static BufferedImage redI; 66 67 static BufferedImage greenI; 68 main(final String[] args)69 public static void main(final String[] args) throws Exception { 70 bi = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB); 71 gold = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB); 72 redI = createImage(RED); 73 greenI = createImage(GREEN); 74 75 System.out.println("Will test fillRect"); 76 test(0, true); 77 test(0, false); 78 System.out.println("Will test DrawImage"); 79 test(1, true); 80 test(1, false); 81 System.out.println("Will test drawLine"); 82 test(2, true); 83 test(2, false); 84 } 85 86 /** 87 * This method draws/fills a number of rectangle, images and lines. Each 88 * time the clip is set as one vertical/horizontal line. The resulted image 89 * should not have any overlapping of different colors. The clip is set via 90 * rectangle(test) and via shape(gold). Both images should be identical. 91 */ test(final int testId, final boolean horiz)92 private static void test(final int testId, final boolean horiz) 93 throws Exception { 94 for (final double scale : SCALES) { 95 // Initialize the test and gold images 96 drawToImage(testId, horiz, scale, bi, /* Rectangle */ false); 97 drawToImage(testId, horiz, scale, gold, /* Shape */ true); 98 validate(bi, gold, testId); 99 } 100 } 101 drawToImage(int testId, boolean horiz, double scale, BufferedImage image, boolean shape)102 private static void drawToImage(int testId, boolean horiz, double scale, 103 BufferedImage image, boolean shape) { 104 Graphics2D g = image.createGraphics(); 105 g.setComposite(AlphaComposite.Src); 106 g.setColor(WHITE); 107 g.fillRect(0, 0, bi.getWidth(), bi.getHeight()); 108 g.setComposite(AlphaComposite.SrcOver); 109 g.setRenderingHint(KEY_STROKE_CONTROL, VALUE_STROKE_PURE); 110 111 // set the scale in one direction 112 if (horiz) { 113 g.scale(scale, 1); 114 } else { 115 g.scale(1, scale); 116 } 117 // cover all units in the user space to touch all pixels in the 118 // image after transform 119 final int destSize = (int) Math.ceil(SIZE / scale); 120 final int destW; 121 final int destH; 122 if (horiz) { 123 destW = destSize; 124 destH = SIZE; 125 } else { 126 destW = SIZE; 127 destH = destSize; 128 } 129 for (int step = 0; step < destSize; ++step) { 130 if (horiz) { 131 if (!shape) { 132 g.setClip(step, 0, 1, SIZE); 133 } else{ 134 g.setClip(new Area(new Rectangle(step, 0, 1, SIZE))); 135 } 136 } else { 137 if (!shape) { 138 g.setClip(0, step, SIZE, 1); 139 }else{ 140 g.setClip(new Area(new Rectangle(0, step, SIZE, 1))); 141 } 142 } 143 switch (testId) { 144 case 0: 145 g.setColor(step % 2 == 0 ? RED : GREEN); 146 g.fillRect(0, 0, destW, destH); 147 break; 148 case 1: 149 g.drawImage(step % 2 == 0 ? redI : greenI, 0, 0, 150 destW, destH, null); 151 break; 152 case 2: 153 g.setColor(step % 2 == 0 ? RED : GREEN); 154 g.setStroke(STROKE); 155 if (horiz) { 156 g.drawLine(step, 0, step, SIZE); 157 } else { 158 g.drawLine(0, step, SIZE, step); 159 } 160 break; 161 default: 162 throw new RuntimeException(); 163 } 164 } 165 g.dispose(); 166 } 167 validate(final BufferedImage bi, BufferedImage gold, final int testID)168 private static void validate(final BufferedImage bi, BufferedImage gold, 169 final int testID) throws Exception { 170 for (int x = 0; x < SIZE; ++x) { 171 for (int y = 0; y < SIZE; ++y) { 172 int rgb = bi.getRGB(x, y); 173 int goldRGB = gold.getRGB(x, y); 174 if ((rgb != GREEN.getRGB() && rgb != RED.getRGB()) 175 || rgb != goldRGB) { 176 ImageIO.write(bi, "png", new File("image.png")); 177 ImageIO.write(gold, "png", new File("gold.png")); 178 throw new RuntimeException("Test failed."); 179 } 180 } 181 } 182 } 183 createImage(final Color color)184 private static BufferedImage createImage(final Color color) { 185 BufferedImage bi = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB); 186 Graphics2D g = bi.createGraphics(); 187 g.setComposite(AlphaComposite.Src); 188 g.setColor(color); 189 g.fillRect(0, 0, bi.getWidth(), bi.getHeight()); 190 g.dispose(); 191 return bi; 192 } 193 } 194