The image manager now falls back to loading images via the Toolkit if it

can't load the ImageIO classes. This unfortunately means that we're back
to passing a Component instance to the ImageManager at construct time.
Whee!


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@749 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/image/ImageUtil.java

@@ -0,0 +1,40 @@
+//
+// $Id: ImageUtil.java,v 1.1 2001/12/07 01:33:29 mdb Exp $
+
+package com.threerings.media;
+
+import java.awt.Image;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+
+/**
+ * Image related utility functions.
+ */
+public class ImageUtil
+{
+    /**
+     * Extracts a subimage from the supplied image with the specified
+     * dimensions. If the supplied image is an instance of {@link
+     * BufferedImage}, then the subimage will simply reference the main
+     * image. If it is not, the subimage will be created and the data will
+     * be rendered into the newly created image.
+     *
+     * @return the desired subimage.
+     */
+    public static Image getSubimage (
+        Image source, int x, int y, int width, int height)
+    {
+        if (source instanceof BufferedImage) {
+            return ((BufferedImage)source).getSubimage(x, y, width, height);
+
+        } else {
+            BufferedImage target =
+                new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
+            Graphics g = target.getGraphics();
+            g.drawImage(source, 0, 0, width, height,
+                        x, y, x+width, y+height, null);
+            g.dispose();
+            return target;
+        }
+    }
+}