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;
  
  import com.ailiwean.core.zxing.core.common.BitArray;
  import com.ailiwean.core.zxing.core.common.BitMatrix;
  
  /**
   * This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
   * accept a BinaryBitmap and attempt to decode it.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   */
  public final class BinaryBitmap {
  
      private final Binarizer binarizer;
      private BitMatrix matrix;
  
      public BinaryBitmap(Binarizer binarizer) {
          if (binarizer == null) {
              throw new IllegalArgumentException("Binarizer must be non-null.");
          }
          this.binarizer = binarizer;
      }
  
      public Binarizer getBinarizer() {
          return binarizer;
      }
  
      /**
       * @return The width of the bitmap.
       */
      public int getWidth() {
          return binarizer.getWidth();
      }
  
      /**
       * @return The height of the bitmap.
       */
      public int getHeight() {
          return binarizer.getHeight();
      }
  
      /**
       * Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
       * cached data. Callers should assume this method is expensive and call it as seldom as possible.
       * This method is intended for decoding 1D barcodes and may choose to apply sharpening.
       *
       * @param y   The row to fetch, which must be in [0, bitmap height)
       * @param row An optional preallocated array. If null or too small, it will be ignored.
       *            If used, the Binarizer will call BitArray.clear(). Always use the returned object.
       * @return The array of bits for this row (true means black).
       * @throws NotFoundException if row can't be binarized
       */
      public BitArray getBlackRow(int y, BitArray row) throws NotFoundException {
          return binarizer.getBlackRow(y, row);
      }
  
      /**
       * Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
       * and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
       * may not apply sharpening. Therefore, a row from this matrix may not be identical to one
       * fetched using getBlackRow(), so don't mix and match between them.
       *
       * @return The 2D array of bits for the image (true means black).
       * @throws NotFoundException if image can't be binarized to make a matrix
       */
      public BitMatrix getBlackMatrix() throws NotFoundException {
          // The matrix is created on demand the first time it is requested, then cached. There are two
          // reasons for this:
          // 1. This work will never be done if the caller only installs 1D Reader objects, or if a
          //    1D Reader finds a barcode before the 2D Readers run.
          // 2. This work will only be done once even if the caller installs multiple 2D Readers.
          if (matrix == null) {
              matrix = binarizer.getBlackMatrix();
          }
          return matrix;
      }
  
      /**
       * @return Whether this bitmap can be cropped.
       */
      public boolean isCropSupported() {
          return binarizer.getLuminanceSource().isCropSupported();
      }
  
      /**
       * Returns a new object with cropped image data. Implementations may keep a reference to the
       * original data rather than a copy. Only callable if isCropSupported() is true.
       *
       * @param left   The left coordinate, which must be in [0,getWidth())
       * @param top    The top coordinate, which must be in [0,getHeight())
       * @param width  The width of the rectangle to crop.
       * @param height The height of the rectangle to crop.
       * @return A cropped version of this object.
       */
      public BinaryBitmap crop(int left, int top, int width, int height) {
          LuminanceSource newSource = binarizer.getLuminanceSource().crop(left, top, width, height);
          return new BinaryBitmap(binarizer.createBinarizer(newSource));
      }
  
      /**
       * @return Whether this bitmap supports counter-clockwise rotation.
       */
      public boolean isRotateSupported() {
          return binarizer.getLuminanceSource().isRotateSupported();
      }
  
      /**
       * Returns a new object with rotated image data by 90 degrees counterclockwise.
       * Only callable if {@link #isRotateSupported()} is true.
       *
       * @return A rotated version of this object.
       */
      public BinaryBitmap rotateCounterClockwise() {
          LuminanceSource newSource = binarizer.getLuminanceSource().rotateCounterClockwise();
          return new BinaryBitmap(binarizer.createBinarizer(newSource));
      }
  
      /**
       * Returns a new object with rotated image data by 45 degrees counterclockwise.
       * Only callable if {@link #isRotateSupported()} is true.
       *
       * @return A rotated version of this object.
       */
      public BinaryBitmap rotateCounterClockwise45() {
          LuminanceSource newSource = binarizer.getLuminanceSource().rotateCounterClockwise45();
          return new BinaryBitmap(binarizer.createBinarizer(newSource));
      }
  
      @Override
      public String toString() {
          try {
              return getBlackMatrix().toString();
          } catch (NotFoundException e) {
              return "";
          }
      }
  
  }
  