[Polycasso-commit] SF.net SVN: polycasso:[139] trunk/polycasso/src/com/mebigfatguy/polycasso/ ImageSizer.java

[<dbr...@us...>]

Revision: 139
          http://polycasso.svn.sourceforge.net/polycasso/?rev=139&view=rev
Author:   dbrosius
Date:     2009-12-05 06:22:56 +0000 (Sat, 05 Dec 2009)

Log Message:
-----------
a class to wait for the loading of width/height values of an image.

Added Paths:
-----------
    trunk/polycasso/src/com/mebigfatguy/polycasso/ImageSizer.java

Added: trunk/polycasso/src/com/mebigfatguy/polycasso/ImageSizer.java
===================================================================
--- trunk/polycasso/src/com/mebigfatguy/polycasso/ImageSizer.java	                        (rev 0)
+++ trunk/polycasso/src/com/mebigfatguy/polycasso/ImageSizer.java	2009-12-05 06:22:56 UTC (rev 139)
@@ -0,0 +1,103 @@
+/*
+ * polycasso - Cubism Artwork generator
+ * Copyright 2009 MeBigFatGuy.com
+ * Copyright 2009 Dave Brosius
+ * Inspired by work by Roger Alsing
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ * 
+ *    http://www.apache.org/licenses/LICENSE-2.0 
+ *    
+ * Unless required by applicable law or agreed to in writing, 
+ * software distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and limitations 
+ * under the License. 
+ */
+package com.mebigfatguy.polycasso;
+
+import java.awt.Image;
+import java.awt.image.ImageObserver;
+
+/**
+ * ensures that the fetching of the width or height of an image will always return a non negative number
+ */
+public class ImageSizer implements ImageObserver {
+
+	private Object lock = new Object();
+	private Image image;
+	private int imageWidth = -1;
+	private int imageHeight = -1;
+	
+	/**
+	 * constructs an image sizer for the specified image
+	 * 
+	 * @param loadedImage the image to get the width and height of
+	 */
+	public ImageSizer(Image loadedImage) {
+		image = loadedImage;
+		imageWidth = image.getWidth(this);
+		imageHeight = image.getHeight(this);
+	}
+
+	/**
+	 * implements the callback to collect the width and height of the image
+	 * 
+	 * @param img the image that is being loaded
+	 * @param infoflags flags specifying what has changed
+	 * @param x the horizontal position
+	 * @param y the vertical position
+	 * @param width the width of the image
+	 * @param height the height of the image
+	 * 
+	 * @return whether further processing is desired
+	 */
+	@Override
+	public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
+		synchronized(lock) {
+			if ((infoflags & ImageObserver.WIDTH) != 0)
+				imageWidth = width;
+			if ((infoflags & ImageObserver.HEIGHT) != 0)
+				imageHeight = height;
+			
+			lock.notifyAll();
+			return (imageWidth < 0) || (imageHeight < 0);
+		}
+	}
+	
+	/**
+	 * get the width of the image, waiting if necessary
+	 * 
+	 * @return the width of the image
+	 */
+	public int getWidth() {
+		synchronized(lock) {
+			try {
+				while (imageWidth < 0) {
+					lock.wait();
+				}
+			} catch (InterruptedException ie) {
+			}
+			return imageWidth;
+		}
+	}
+	
+	/**
+	 * get the height of the image, waiting if necessary
+	 * 
+	 * @return the height of the image
+	 */
+	public int getHeight() {
+		synchronized(lock) {
+			try {
+				while (imageHeight < 0) {
+					lock.wait();
+				}
+			} catch (InterruptedException ie) {
+			}
+			return imageHeight;
+		}
+	}
+}


Property changes on: trunk/polycasso/src/com/mebigfatguy/polycasso/ImageSizer.java
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Added: svn:mime-type
   + text/plain
Added: svn:eol-style
   + native


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