1 files changed, 82 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/xlib/Drawable.java b/libjava/gnu/gcj/xlib/Drawable.java
new file mode 100644
index 00000000000..56527927b1b
--- /dev/null
+++ b/libjava/gnu/gcj/xlib/Drawable.java
@@ -0,0 +1,82 @@
+/* Copyright (C) 1999, 2000  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package gnu.gcj.xlib;
+
+import java.awt.Rectangle;
+
+/** An X11 drawable.
+ *
+ * @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
+ */
+public class Drawable extends XID
+{
+  public Drawable(Display display, int xid)
+  {
+    super(display, xid);
+  }
+
+  /**
+   * Gets as much as possible of the image data within the requested
+   * region. Data from obscured parts of windows may not be
+   * retrievable.
+   *  
+   * @param dest where to place the image data.
+   * 
+   * @return the actual region of image data that was retrieved.
+   */
+  public Rectangle copyIntoXImage(XImage dest, Rectangle bounds,
+				  int destX, int destY)
+  {
+    Rectangle newBounds = null;
+    int tries = 5;
+    while (!bounds.isEmpty())
+      {
+	if (copyIntoXImageImpl(dest, bounds.x, bounds.y,
+			       bounds.width, bounds.height,
+			       destX, destY))
+	  return bounds;
+	    
+	// failed, likely due to wrong bounds...
+	
+	newBounds = getBounds(newBounds);
+	
+	bounds = newBounds.intersection(bounds);
+	
+	tries--;
+	
+	if (tries < 0)
+	throw new RuntimeException("copyIntoXImage is buggy");
+	
+      }
+    
+    return bounds; // always empty
+  }
+
+
+
+  /**
+   * Performs an XGetSubImage. This method will fail if the X server
+   * does not possess the requested image data. This might occur when
+   * requesting the image date of a window that is partially obscured.
+   *
+   * @param desitantionImage where to place the image data
+   *
+   * @return false if method was unable to read the requested region.
+   */
+  private native boolean copyIntoXImageImpl(XImage destinationImage,
+					    int x, int y,
+					    int width, int height,
+					    int destX, int destY);
+
+  public native Rectangle getBounds(Rectangle rv);
+  
+  private static final String MSG_XGETSUBIMAGE_FAILED =
+    "XGetSubImage() failed.";
+    
+}