Better take on InvertedLuminanceSource -- allow possibility of rotation and efficient un-inversion

git-svn-id: https://zxing.googlecode.com/svn/trunk@2576 59b500cc-1b3d-0410-9834-0bbf25fbcc57

core/src/com/google/zxing/InvertedLuminanceSource.java

@@ -52,4 +52,37 @@ public final class InvertedLuminanceSource extends LuminanceSource {
     return invertedMatrix;
   }
   
+  @Override
+  public boolean isCropSupported() {
+    return delegate.isCropSupported();
+  }
+
+  @Override
+  public LuminanceSource crop(int left, int top, int width, int height) {
+    return new InvertedLuminanceSource(delegate.crop(left, top, width, height));
+  }
+
+  @Override
+  public boolean isRotateSupported() {
+    return delegate.isRotateSupported();
+  }
+
+  /**
+   * @return original delegate {@link LuminanceSource} since invert undoes itself
+   */
+  @Override
+  public LuminanceSource invert() {
+    return delegate;
+  }
+
+  @Override
+  public LuminanceSource rotateCounterClockwise() {
+    return new InvertedLuminanceSource(delegate.rotateCounterClockwise());
+  }
+
+  @Override
+  public LuminanceSource rotateCounterClockwise45() {
+    return new InvertedLuminanceSource(delegate.rotateCounterClockwise45());
+  }
+
 }

core/src/com/google/zxing/LuminanceSource.java

@@ -105,7 +105,7 @@ public abstract class LuminanceSource {
    * @return a wrapper of this {@code LuminanceSource} which inverts the luminances it returns -- black becomes
    *  white and vice versa, and each value becomes (255-value).
    */
-  public final LuminanceSource invert() {
+  public LuminanceSource invert() {
     return new InvertedLuminanceSource(this);
   }