content: /*
   * Copyright 2008 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.datamatrix;
  
  
  import com.ailiwean.core.zxing.core.BarcodeFormat;
  import com.ailiwean.core.zxing.core.Dimension;
  import com.ailiwean.core.zxing.core.EncodeHintType;
  import com.ailiwean.core.zxing.core.Writer;
  import com.ailiwean.core.zxing.core.common.BitMatrix;
  import com.ailiwean.core.zxing.core.datamatrix.encoder.DefaultPlacement;
  import com.ailiwean.core.zxing.core.datamatrix.encoder.ErrorCorrection;
  import com.ailiwean.core.zxing.core.datamatrix.encoder.HighLevelEncoder;
  import com.ailiwean.core.zxing.core.datamatrix.encoder.SymbolInfo;
  import com.ailiwean.core.zxing.core.datamatrix.encoder.SymbolShapeHint;
  import com.ailiwean.core.zxing.core.qrcode.encoder.ByteMatrix;
  
  import java.util.Map;
  
  /**
   * This object renders a Data Matrix code as a BitMatrix 2D array of greyscale values.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   * @author Guillaume Le Biller Added to zxing lib.
   */
  public final class DataMatrixWriter implements Writer {
  
    @Override
    public BitMatrix encode(String contents, BarcodeFormat format, int width, int height) {
      return encode(contents, format, width, height, null);
    }
  
    @Override
    public BitMatrix encode(String contents, BarcodeFormat format, int width, int height, Map<EncodeHintType,?> hints) {
  
      if (contents.isEmpty()) {
        throw new IllegalArgumentException("Found empty contents");
      }
  
      if (format != BarcodeFormat.DATA_MATRIX) {
        throw new IllegalArgumentException("Can only encode DATA_MATRIX, but got " + format);
      }
  
      if (width < 0 || height < 0) {
        throw new IllegalArgumentException("Requested dimensions can't be negative: " + width + 'x' + height);
      }
  
      // Try to get force shape & min / max size
      SymbolShapeHint shape = SymbolShapeHint.FORCE_NONE;
      Dimension minSize = null;
      Dimension maxSize = null;
      if (hints != null) {
        SymbolShapeHint requestedShape = (SymbolShapeHint) hints.get(EncodeHintType.DATA_MATRIX_SHAPE);
        if (requestedShape != null) {
          shape = requestedShape;
        }
        @SuppressWarnings("deprecation")
        Dimension requestedMinSize = (Dimension) hints.get(EncodeHintType.MIN_SIZE);
        if (requestedMinSize != null) {
          minSize = requestedMinSize;
        }
        @SuppressWarnings("deprecation")
        Dimension requestedMaxSize = (Dimension) hints.get(EncodeHintType.MAX_SIZE);
        if (requestedMaxSize != null) {
          maxSize = requestedMaxSize;
        }
      }
  
  
      //1. step: Data encodation
      String encoded = HighLevelEncoder.encodeHighLevel(contents, shape, minSize, maxSize);
  
      SymbolInfo symbolInfo = SymbolInfo.lookup(encoded.length(), shape, minSize, maxSize, true);
  
      //2. step: ECC generation
      String codewords = ErrorCorrection.encodeECC200(encoded, symbolInfo);
  
      //3. step: Module placement in Matrix
      DefaultPlacement placement = new DefaultPlacement(codewords, symbolInfo.getSymbolDataWidth(), symbolInfo.getSymbolDataHeight());
      placement.place();
  
      //4. step: low-level encoding
      return encodeLowLevel(placement, symbolInfo, width, height);
    }
  
    /**
     * Encode the given symbol info to a bit matrix.
     *
     * @param placement  The DataMatrix placement.
     * @param symbolInfo The symbol info to encode.
     * @return The bit matrix generated.
     */
    private static BitMatrix encodeLowLevel(DefaultPlacement placement, SymbolInfo symbolInfo, int width, int height) {
      int symbolWidth = symbolInfo.getSymbolDataWidth();
      int symbolHeight = symbolInfo.getSymbolDataHeight();
  
      ByteMatrix matrix = new ByteMatrix(symbolInfo.getSymbolWidth(), symbolInfo.getSymbolHeight());
  
      int matrixY = 0;
  
      for (int y = 0; y < symbolHeight; y++) {
        // Fill the top edge with alternate 0 / 1
        int matrixX;
        if ((y % symbolInfo.matrixHeight) == 0) {
          matrixX = 0;
          for (int x = 0; x < symbolInfo.getSymbolWidth(); x++) {
            matrix.set(matrixX, matrixY, (x % 2) == 0);
            matrixX++;
          }
          matrixY++;
        }
        matrixX = 0;
        for (int x = 0; x < symbolWidth; x++) {
          // Fill the right edge with full 1
          if ((x % symbolInfo.matrixWidth) == 0) {
            matrix.set(matrixX, matrixY, true);
            matrixX++;
          }
          matrix.set(matrixX, matrixY, placement.getBit(x, y));
          matrixX++;
          // Fill the right edge with alternate 0 / 1
          if ((x % symbolInfo.matrixWidth) == symbolInfo.matrixWidth - 1) {
            matrix.set(matrixX, matrixY, (y % 2) == 0);
            matrixX++;
          }
        }
        matrixY++;
        // Fill the bottom edge with full 1
        if ((y % symbolInfo.matrixHeight) == symbolInfo.matrixHeight - 1) {
          matrixX = 0;
          for (int x = 0; x < symbolInfo.getSymbolWidth(); x++) {
            matrix.set(matrixX, matrixY, true);
            matrixX++;
          }
          matrixY++;
        }
      }
  
      return convertByteMatrixToBitMatrix(matrix, width, height);
    }
  
    /**
     * Convert the ByteMatrix to BitMatrix.
     *
     * @param reqHeight The requested height of the image (in pixels) with the Datamatrix code
     * @param reqWidth The requested width of the image (in pixels) with the Datamatrix code
     * @param matrix The input matrix.
     * @return The output matrix.
     */
    private static BitMatrix convertByteMatrixToBitMatrix(ByteMatrix matrix, int reqWidth, int reqHeight) {
      int matrixWidth = matrix.getWidth();
      int matrixHeight = matrix.getHeight();
      int outputWidth = Math.max(reqWidth, matrixWidth);
      int outputHeight = Math.max(reqHeight, matrixHeight);
  
      int multiple = Math.min(outputWidth / matrixWidth, outputHeight / matrixHeight);
  
      int leftPadding = (outputWidth - (matrixWidth * multiple)) / 2 ;
      int topPadding = (outputHeight - (matrixHeight * multiple)) / 2 ;
  
      BitMatrix output;
  
      // remove padding if requested width and height are too small
      if (reqHeight < matrixHeight || reqWidth < matrixWidth) {
        leftPadding = 0;
        topPadding = 0;
        output = new BitMatrix(matrixWidth, matrixHeight);
      } else {
        output = new BitMatrix(reqWidth, reqHeight);
      }
  
      output.clear();
      for (int inputY = 0, outputY = topPadding; inputY < matrixHeight; inputY++, outputY += multiple) {
        // Write the contents of this row of the bytematrix
        for (int inputX = 0, outputX = leftPadding; inputX < matrixWidth; inputX++, outputX += multiple) {
          if (matrix.get(inputX, inputY) == 1) {
            output.setRegion(outputX, outputY, multiple, multiple);
          }
        }
      }
  
      return output;
    }
  
  }
  