content: /*
   * Copyright 2009 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;
  
  /**
   * This object extends LuminanceSource around an array of YUV data returned from the camera driver,
   * with the option to crop to a rectangle within the full data. This can be used to exclude
   * superfluous pixels around the perimeter and speed up decoding.
   * <p>
   * It works for any pixel format where the Y channel is planar and appears first, including
   * YCbCr_420_SP and YCbCr_422_SP.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   */
  public final class PlanarYUVLuminanceSourceRotate extends LuminanceSource {
  
      private byte[] matrix;
  
      public PlanarYUVLuminanceSourceRotate(
              byte[] matrix,
              int width,
              int height) {
          super(height, width);
          this.matrix = matrix;
      }
  
      @Override
      public byte[] getRow(int x, byte[] row) {
          if (x < 0 || x >= getHeight()) {
              throw new IllegalArgumentException("Requested row is outside the image: " + x);
          }
          int width = getWidth();
          if (row == null || row.length < width) {
              row = new byte[width];
          }
          for (int i = 0; i < getWidth(); i++) {
              row[i] = matrix[i * getHeight() + x];
          }
          return row;
      }
  
      @Override
      public byte[] getMatrix() {
          return null;
      }
  
      @Override
      public boolean isCropSupported() {
          return true;
      }
  }
  