70 lines
2.5 KiB
Java
70 lines
2.5 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.image.BaseMultiResolutionImage;
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import java.awt.image.BufferedImage;
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import java.awt.image.ImageObserver;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import static java.awt.image.BufferedImage.TYPE_INT_RGB;
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/**
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* @test
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* @bug 8257500
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* @summary Drawing MultiResolutionImage with ImageObserver may "leaks" memory
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*/
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public final class ImageObserverLeak {
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public static void main(String[] args) throws Exception {
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Reference<ImageObserver> ref = test();
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while (!ref.refersTo(null)) {
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Thread.sleep(500);
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// Cannot generate OOM here, it will clear the SoftRefs as well
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System.gc();
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}
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}
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private static Reference<ImageObserver> test() throws Exception {
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BufferedImage src = new BufferedImage(200, 200, TYPE_INT_RGB);
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Image mri = new BaseMultiResolutionImage(src);
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ImageObserver observer = new ImageObserver() {
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@Override
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public boolean imageUpdate(Image img, int infoflags, int x, int y,
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int width, int height) {
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return false;
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}
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};
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Reference<ImageObserver> ref = new WeakReference<>(observer);
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BufferedImage dst = new BufferedImage(200, 300, TYPE_INT_RGB);
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Graphics2D g2d = dst.createGraphics();
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g2d.drawImage(mri, 0, 0, observer);
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g2d.dispose();
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return ref;
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}
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}
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