Obscurers can now be told to only include changed regions in their reported obscured rectangle.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@895 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/MediaPanel.java

@@ -82,7 +82,7 @@ public class MediaPanel extends JComponent
         /**
          * Returns the region obscured by the obscurer, in screen coords.
          */
-        public Rectangle getObscured ();
+        public Rectangle getObscured (boolean changedOnly);
     }
 
     /**
@@ -342,7 +342,7 @@ public class MediaPanel extends JComponent
             _tickPaintPending = false;
         }
 
-        addObscurerDirtyRegions();
+        addObscurerDirtyRegions(true);
 
         // if we have no invalid rects, there's no need to repaint
         if (!_metamgr.getRegionManager().haveDirtyRegions()) {
@@ -386,15 +386,17 @@ public class MediaPanel extends JComponent
     /**
      * Add dirty regions for all our obscurers.
      */
-    protected void addObscurerDirtyRegions ()
+    protected void addObscurerDirtyRegions (boolean changedOnly)
     {
         if (_obscurerList != null) {
             for (Obscurer obscurer : _obscurerList) {
-
-                Rectangle obscured = obscurer.getObscured();
-                Point pt = new Point(obscured.x, obscured.y);
-                SwingUtilities.convertPointFromScreen(pt, this);
-                addObscurerDirtyRegion(new Rectangle(pt.x, pt.y, obscured.width, obscured.height));
+                Rectangle obscured = obscurer.getObscured(changedOnly);
+                if (obscured != null) {
+                    Point pt = new Point(obscured.x, obscured.y);
+                    SwingUtilities.convertPointFromScreen(pt, this);
+                    addObscurerDirtyRegion(
+                        new Rectangle(pt.x, pt.y, obscured.width, obscured.height));
+                }
             }
         }
     }

src/java/com/threerings/media/VirtualMediaPanel.java

@@ -287,6 +287,8 @@ public class VirtualMediaPanel extends MediaPanel
             // booch everything
             _vbounds.x = _nx; _vbounds.y = _ny;
 
+            addObscurerDirtyRegions(false);
+
             // let derived classes react if they so desire
             viewLocationDidChange(dx, dy);
         }