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8188083: NullPointerExcpn-java.awt.image.FilteredImageSource.startProduction JDK-8079607

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Reviewed-by: serb, prr, jdv
This commit is contained in:
Prahalad Narayanan 2017-12-12 14:05:21 +05:30 • committed by Prahalad Kumar Narayanan
parent 72e094dcd4
commit c0e7592e4e
2 changed files with 217 additions and 4 deletions
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9
src/java.desktop/share/classes/java/awt/image/FilteredImageSource.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1995, 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
@ -35,7 +35,8 @@ import java.awt.image.ColorModel;
/**
* This class is an implementation of the ImageProducer interface which
* takes an existing image and a filter object and uses them to produce
* image data for a new filtered version of the original image.
* image data for a new filtered version of the original image. Furthermore,
* {@code FilteredImageSource} is safe for use by multiple threads.
* Here is an example which filters an image by swapping the red and
* blue components:
* <pre>
@ -171,7 +172,7 @@ public class FilteredImageSource implements ImageProducer {
* @param ic the consumer for the filtered image
* @see ImageConsumer
*/
public void startProduction(ImageConsumer ic) {
public synchronized void startProduction(ImageConsumer ic) {
if (proxies == null) {
proxies = new Hashtable<>();
}
@ -198,7 +199,7 @@ public class FilteredImageSource implements ImageProducer {
*
* @see ImageConsumer
*/
public void requestTopDownLeftRightResend(ImageConsumer ic) {
public synchronized void requestTopDownLeftRightResend(ImageConsumer ic) {
if (proxies != null) {
ImageFilter imgf = proxies.get(ic);
if (imgf != null) {