content: /*
   * Copyright 2013 ZXing authors
   *
   * 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.ailiwean.core.zxing.core;
  
  
  /**
   * A wrapper implementation of {@link LuminanceSource} which inverts the luminances it returns -- black becomes
   * white and vice versa, and each value becomes (255-value).
   *
   * @author Sean Owen
   */
  public final class InvertedLuminanceSource extends LuminanceSource {
  
      private final LuminanceSource delegate;
  
      public InvertedLuminanceSource(LuminanceSource delegate) {
          super(delegate.getWidth(), delegate.getHeight());
          this.delegate = delegate;
      }
  
      @Override
      public byte[] getRow(int y, byte[] row) {
          row = delegate.getRow(y, row);
          int width = getWidth();
          for (int i = 0; i < width; i++) {
              row[i] = (byte) (255 - (row[i] & 0xFF));
          }
          return row;
      }
  
      @Override
      public byte[] getMatrix() {
          byte[] matrix = delegate.getMatrix();
          int length = getWidth() * getHeight();
          byte[] invertedMatrix = new byte[length];
          for (int i = 0; i < length; i++) {
              invertedMatrix[i] = (byte) (255 - (matrix[i] & 0xFF));
          }
          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());
      }
  
  }
  