添加项目文件。

zxing.core/xx/datamatrix/DataMatrixReader.cs

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+/*
+ * Copyright 2007 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.
+ */
+
+using System.Collections.Generic;
+
+using ZXing.Common;
+using ZXing.Datamatrix.Internal;
+
+namespace ZXing.Datamatrix
+{
+   /// <summary>
+   /// This implementation can detect and decode Data Matrix codes in an image.
+   ///
+   /// <author>bbrown@google.com (Brian Brown)</author>
+   /// </summary>
+   public sealed class DataMatrixReader : Reader
+   {
+      private static readonly ResultPoint[] NO_POINTS = new ResultPoint[0];
+
+      private readonly Decoder decoder = new Decoder();
+
+      /// <summary>
+      /// Locates and decodes a Data Matrix code in an image.
+      ///
+      /// <returns>a String representing the content encoded by the Data Matrix code</returns>
+      /// <exception cref="FormatException">if a Data Matrix code cannot be decoded</exception>
+      /// </summary>
+      public Result decode(BinaryBitmap image)
+      {
+         return decode(image, null);
+      }
+
+      public Result decode(BinaryBitmap image, IDictionary<DecodeHintType, object> hints)
+      {
+         DecoderResult decoderResult;
+         ResultPoint[] points;
+         if (hints != null && hints.ContainsKey(DecodeHintType.PURE_BARCODE))
+         {
+            BitMatrix bits = extractPureBits(image.BlackMatrix);
+            if (bits == null)
+               return null;
+            decoderResult = decoder.decode(bits);
+            points = NO_POINTS;
+         }
+         else
+         {
+            DetectorResult detectorResult = new Detector(image.BlackMatrix).detect();
+            if (detectorResult == null)
+               return null;
+            decoderResult = decoder.decode(detectorResult.Bits);
+            points = detectorResult.Points;
+         }
+         if (decoderResult == null)
+            return null;
+
+         Result result = new Result(decoderResult.Text, decoderResult.RawBytes, points,
+             BarcodeFormat.DATA_MATRIX);
+         IList<byte[]> byteSegments = decoderResult.ByteSegments;
+         if (byteSegments != null)
+         {
+            result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, byteSegments);
+         }
+         var ecLevel = decoderResult.ECLevel;
+         if (ecLevel != null)
+         {
+            result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, ecLevel);
+         }
+         return result;
+      }
+
+      public void reset()
+      {
+         // do nothing
+      }
+
+      /// <summary>
+      /// This method detects a code in a "pure" image -- that is, pure monochrome image
+      /// which contains only an unrotated, unskewed, image of a code, with some white border
+      /// around it. This is a specialized method that works exceptionally fast in this special
+      /// case.
+      ///
+      /// <seealso cref="ZXing.QrCode.QRCodeReader.extractPureBits(BitMatrix)" />
+      /// </summary>
+      private static BitMatrix extractPureBits(BitMatrix image)
+      {
+         int[] leftTopBlack = image.getTopLeftOnBit();
+         int[] rightBottomBlack = image.getBottomRightOnBit();
+         if (leftTopBlack == null || rightBottomBlack == null)
+         {
+            return null;
+         }
+
+         int moduleSize;
+         if (!DataMatrixReader.moduleSize(leftTopBlack, image, out moduleSize))
+            return null;
+
+         int top = leftTopBlack[1];
+         int bottom = rightBottomBlack[1];
+         int left = leftTopBlack[0];
+         int right = rightBottomBlack[0];
+
+         int matrixWidth = (right - left + 1) / moduleSize;
+         int matrixHeight = (bottom - top + 1) / moduleSize;
+         if (matrixWidth <= 0 || matrixHeight <= 0)
+         {
+            return null;
+         }
+
+         // Push in the "border" by half the module width so that we start
+         // sampling in the middle of the module. Just in case the image is a
+         // little off, this will help recover.
+         int nudge = moduleSize >> 1;
+         top += nudge;
+         left += nudge;
+
+         // Now just read off the bits
+         BitMatrix bits = new BitMatrix(matrixWidth, matrixHeight);
+         for (int y = 0; y < matrixHeight; y++)
+         {
+            int iOffset = top + y * moduleSize;
+            for (int x = 0; x < matrixWidth; x++)
+            {
+               if (image[left + x * moduleSize, iOffset])
+               {
+                  bits[x, y] = true;
+               }
+            }
+         }
+         return bits;
+      }
+
+      private static bool moduleSize(int[] leftTopBlack, BitMatrix image, out int modulesize)
+      {
+         int width = image.Width;
+         int x = leftTopBlack[0];
+         int y = leftTopBlack[1];
+         while (x < width && image[x, y])
+         {
+            x++;
+         }
+         if (x == width)
+         {
+            modulesize = 0;
+            return false;
+         }
+
+         modulesize = x - leftTopBlack[0];
+         if (modulesize == 0)
+         {
+            return false;
+         }
+         return true;
+      }
+   }
+}