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67 lines
2.3 KiB
C#
67 lines
2.3 KiB
C#
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// /*
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// * Copyright 2009 ZXing authors
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// *
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// * Licensed under the Apache License, Version 2.0 (the "License");
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// * you may not use this file except in compliance with the License.
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// * You may obtain a copy of the License at
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// *
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// * http://www.apache.org/licenses/LICENSE-2.0
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// *
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// * Unless required by applicable law or agreed to in writing, software
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// * distributed under the License is distributed on an "AS IS" BASIS,
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// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// * See the License for the specific language governing permissions and
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// * limitations under the License.
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// */
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using System;
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using ZXing.Common;
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namespace ZXing.PDF417
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{
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/// <summary>
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/// Bit matrix extensions to assist in PDF417 Detection
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/// </summary>
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public static class BitMatrixExtensions
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{
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/// <summary>
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/// Rotates the Matrix by 180 degrees in-place
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/// </summary>
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/// <param name="bitMatrix">Bit matrix.</param>
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public static void Rotate180(this BitMatrix bitMatrix)
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{
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int width = bitMatrix.Width;
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int height = bitMatrix.Height;
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BitArray firstRowBitArray = new BitArray(width);
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BitArray secondRowBitArray = new BitArray(width);
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BitArray tmpBitArray = new BitArray(width); // re-use this to save on 'new' calls
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for (int y = 0; y < height + 1 >> 1; y++)
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{
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firstRowBitArray = bitMatrix.getRow(y, firstRowBitArray);
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Mirror(bitMatrix.getRow(height - 1 - y, secondRowBitArray), ref tmpBitArray);
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bitMatrix.setRow(y, tmpBitArray);
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Mirror(firstRowBitArray, ref tmpBitArray);
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bitMatrix.setRow(height - 1 - y, tmpBitArray);
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}
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}
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/// <summary>
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/// Copies the bits from the input to the result BitArray in reverse order.
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/// SF: Not sure how this is different than BitArray.Reverse();
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/// </summary>
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/// <param name="input">Input.</param>
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/// <param name="result">Result.</param>
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private static void Mirror(BitArray input, ref BitArray result)
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{
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result.clear();
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int size = input.Size;
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for (int i = 0; i < size; i++)
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{
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result[size - 1 - i] = input[i];
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}
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}
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}
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}
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