添加项目文件。

zxing.core/xx/multi/ByQuadrantReader.cs

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+/*
+* 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.
+*/
+
+using System.Collections.Generic;
+
+namespace ZXing.Multi
+{
+   /// <summary>
+   /// This class attempts to decode a barcode from an image, not by scanning the whole image,
+   /// but by scanning subsets of the image. This is important when there may be multiple barcodes in
+   /// an image, and detecting a barcode may find parts of multiple barcode and fail to decode
+   /// (e.g. QR Codes). Instead this scans the four quadrants of the image -- and also the center
+   /// 'quadrant' to cover the case where a barcode is found in the center.
+   /// </summary>
+   /// <seealso cref="GenericMultipleBarcodeReader" />
+   public sealed class ByQuadrantReader : Reader
+   {
+      private readonly Reader @delegate;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="ByQuadrantReader"/> class.
+      /// </summary>
+      /// <param name="delegate">The @delegate.</param>
+      public ByQuadrantReader(Reader @delegate)
+      {
+         this.@delegate = @delegate;
+      }
+
+      /// <summary>
+      /// Locates and decodes a barcode in some format within an image.
+      /// </summary>
+      /// <param name="image">image of barcode to decode</param>
+      /// <returns>
+      /// String which the barcode encodes
+      /// </returns>
+      public Result decode(BinaryBitmap image)
+      {
+         return decode(image, null);
+      }
+
+      /// <summary>
+      /// Locates and decodes a barcode in some format within an image. This method also accepts
+      /// hints, each possibly associated to some data, which may help the implementation decode.
+      /// </summary>
+      /// <param name="image">image of barcode to decode</param>
+      /// <param name="hints">passed as a <see cref="IDictionary{TKey, TValue}"/> from <see cref="DecodeHintType"/>
+      /// to arbitrary data. The
+      /// meaning of the data depends upon the hint type. The implementation may or may not do
+      /// anything with these hints.</param>
+      /// <returns>
+      /// String which the barcode encodes
+      /// </returns>
+      public Result decode(BinaryBitmap image, IDictionary<DecodeHintType, object> hints)
+      {
+         int width = image.Width;
+         int height = image.Height;
+         int halfWidth = width/2;
+         int halfHeight = height/2;
+
+         // No need to call makeAbsolute as results will be relative to original top left here
+         var result = @delegate.decode(image.crop(0, 0, halfWidth, halfHeight), hints);
+         if (result != null)
+            return result;
+
+         result = @delegate.decode(image.crop(halfWidth, 0, halfWidth, halfHeight), hints);
+         if (result != null)
+         {
+            makeAbsolute(result.ResultPoints, halfWidth, 0);
+            return result;
+         }
+
+         result = @delegate.decode(image.crop(0, halfHeight, halfWidth, halfHeight), hints);
+         if (result != null)
+         {
+            makeAbsolute(result.ResultPoints, 0, halfHeight);
+            return result;
+         }
+
+         result = @delegate.decode(image.crop(halfWidth, halfHeight, halfWidth, halfHeight), hints);
+         if (result != null)
+         {
+            makeAbsolute(result.ResultPoints, halfWidth, halfHeight);
+            return result;
+         }
+
+         int quarterWidth = halfWidth/2;
+         int quarterHeight = halfHeight/2;
+         var center = image.crop(quarterWidth, quarterHeight, halfWidth, halfHeight);
+         result = @delegate.decode(center, hints);
+         makeAbsolute(result.ResultPoints, quarterWidth, quarterHeight);
+         return result;
+      }
+
+      /// <summary>
+      /// Resets any internal state the implementation has after a decode, to prepare it
+      /// for reuse.
+      /// </summary>
+      public void reset()
+      {
+         @delegate.reset();
+      }
+
+      private static void makeAbsolute(ResultPoint[] points, int leftOffset, int topOffset)
+      {
+         if (points != null)
+         {
+            for (int i = 0; i < points.Length; i++)
+            {
+               ResultPoint relative = points[i];
+               points[i] = new ResultPoint(relative.X + leftOffset, relative.Y + topOffset);
+            }
+         }
+      }
+   }
+}