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/*
* Copyright (c) 2016, 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.
*/
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import static java.awt.RenderingHints.KEY_STROKE_CONTROL;
import static java.awt.RenderingHints.VALUE_STROKE_PURE;
import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
/**
* @test
* @key headful
* @bug 8167310
* @summary The clip should be correct if the scale is fractional
*/
public final class IncorrectFractionalClip {
private static final int SIZE = 128;
public static final Color RED = new Color(255, 0, 0, 100);
public static final Color GREEN = new Color(0, 255, 0, 100);
public static final Color WHITE = new Color(0, 0, 0, 0);
public static final BasicStroke STROKE = new BasicStroke(2.01f);
private static final double[] SCALES = {
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
};
static BufferedImage bi;
static BufferedImage gold;
static BufferedImage redI;
static BufferedImage greenI;
public static void main(final String[] args) throws Exception {
bi = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB);
gold = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB);
redI = createImage(RED);
greenI = createImage(GREEN);
System.out.println("Will test fillRect");
test(0, true);
test(0, false);
System.out.println("Will test DrawImage");
test(1, true);
test(1, false);
System.out.println("Will test drawLine");
test(2, true);
test(2, false);
}
/**
* This method draws/fills a number of rectangle, images and lines. Each
* time the clip is set as one vertical/horizontal line. The resulted image
* should not have any overlapping of different colors. The clip is set via
* rectangle(test) and via shape(gold). Both images should be identical.
*/
private static void test(final int testId, final boolean horiz)
throws Exception {
for (final double scale : SCALES) {
// Initialize the test and gold images
drawToImage(testId, horiz, scale, bi, /* Rectangle */ false);
drawToImage(testId, horiz, scale, gold, /* Shape */ true);
validate(bi, gold, testId);
}
}
private static void drawToImage(int testId, boolean horiz, double scale,
BufferedImage image, boolean shape) {
Graphics2D g = image.createGraphics();
g.setComposite(AlphaComposite.Src);
g.setColor(WHITE);
g.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g.setComposite(AlphaComposite.SrcOver);
g.setRenderingHint(KEY_STROKE_CONTROL, VALUE_STROKE_PURE);
// set the scale in one direction
if (horiz) {
g.scale(scale, 1);
} else {
g.scale(1, scale);
}
// cover all units in the user space to touch all pixels in the
// image after transform
final int destSize = (int) Math.ceil(SIZE / scale);
final int destW;
final int destH;
if (horiz) {
destW = destSize;
destH = SIZE;
} else {
destW = SIZE;
destH = destSize;
}
for (int step = 0; step < destSize; ++step) {
if (horiz) {
if (!shape) {
g.setClip(step, 0, 1, SIZE);
} else{
g.setClip(new Area(new Rectangle(step, 0, 1, SIZE)));
}
} else {
if (!shape) {
g.setClip(0, step, SIZE, 1);
}else{
g.setClip(new Area(new Rectangle(0, step, SIZE, 1)));
}
}
switch (testId) {
case 0:
g.setColor(step % 2 == 0 ? RED : GREEN);
g.fillRect(0, 0, destW, destH);
break;
case 1:
g.drawImage(step % 2 == 0 ? redI : greenI, 0, 0,
destW, destH, null);
break;
case 2:
g.setColor(step % 2 == 0 ? RED : GREEN);
g.setStroke(STROKE);
if (horiz) {
g.drawLine(step, 0, step, SIZE);
} else {
g.drawLine(0, step, SIZE, step);
}
break;
default:
throw new RuntimeException();
}
}
g.dispose();
}
private static void validate(final BufferedImage bi, BufferedImage gold,
final int testID) throws Exception {
for (int x = 0; x < SIZE; ++x) {
for (int y = 0; y < SIZE; ++y) {
int rgb = bi.getRGB(x, y);
int goldRGB = gold.getRGB(x, y);
if ((rgb != GREEN.getRGB() && rgb != RED.getRGB())
|| rgb != goldRGB) {
ImageIO.write(bi, "png", new File("image.png"));
ImageIO.write(gold, "png", new File("gold.png"));
throw new RuntimeException("Test failed.");
}
}
}
}
private static BufferedImage createImage(final Color color) {
BufferedImage bi = new BufferedImage(SIZE, SIZE, TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
g.setComposite(AlphaComposite.Src);
g.setColor(color);
g.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g.dispose();
return bi;
}
}
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