zxing/csharp/common/ByteMatrix.cs

/*
* 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.
*/
using System;
using System.Drawing.Imaging;
using System.Drawing;
using System.Runtime.InteropServices;
namespace com.google.zxing.common
{
	
	/// <summary> A class which wraps a 2D array of bytes. The default usage is signed. If you want to use it as a
	/// unsigned container, it's up to you to do byteValue & 0xff at each location.
	/// 
	/// JAVAPORT: The original code was a 2D array of ints, but since it only ever gets assigned
	/// -1, 0, and 1, I'm going to use less memory and go with bytes.
	/// 
	/// </summary>
	/// <author>  dswitkin@google.com (Daniel Switkin)
	/// </author>
	/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
	/// </author>
	public sealed class ByteMatrix
	{
		public int Height
		{
			get
			{
				return height;
			}
			
		}
		public int Width
		{
			get
			{
				return width;
			}
			
		}
		public sbyte[][] Array
		{
			get
			{
				return bytes;
			}
			
		}
		
		//UPGRADE_NOTE: Final was removed from the declaration of 'bytes '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
		private sbyte[][] bytes;
		//UPGRADE_NOTE: Final was removed from the declaration of 'width '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
		private int width;
		//UPGRADE_NOTE: Final was removed from the declaration of 'height '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
		private int height;
		
		public ByteMatrix(int width, int height)
		{
			bytes = new sbyte[height][];
			for (int i = 0; i < height; i++)
			{
				bytes[i] = new sbyte[width];
			}
			this.width = width;
			this.height = height;
		}
		
		public sbyte get_Renamed(int x, int y)
		{
			return bytes[y][x];
		}
		
		public void  set_Renamed(int x, int y, sbyte value_Renamed)
		{
			bytes[y][x] = value_Renamed;
		}
		
		public void  set_Renamed(int x, int y, int value_Renamed)
		{
			bytes[y][x] = (sbyte) value_Renamed;
		}
		
		public void  clear(sbyte value_Renamed)
		{
			for (int y = 0; y < height; ++y)
			{
				for (int x = 0; x < width; ++x)
				{
					bytes[y][x] = value_Renamed;
				}
			}
		}
		
		public override System.String ToString()
		{
			System.Text.StringBuilder result = new System.Text.StringBuilder(2 * width * height + 2);
			for (int y = 0; y < height; ++y)
			{
				for (int x = 0; x < width; ++x)
				{
					switch (bytes[y][x])
					{
						
						case 0: 
							result.Append(" 0");
							break;
						
						case 1: 
							result.Append(" 1");
							break;
						
						default: 
							result.Append("  ");
							break;
						
					}
				}
				result.Append('\n');
			}
			return result.ToString();
		}

		/// <summary>
		/// Converts this ByteMatrix to a black and white bitmap.
		/// </summary>
		/// <returns>A black and white bitmap converted from this ByteMatrix.</returns>
		public Bitmap ToBitmap()
		{
			const byte BLACK = 0;
			const byte WHITE = 255;
			sbyte[][] array = this.Array;
			int width = this.Width;
			int height = this.Height;
			//Here create the Bitmap to the known height, width and format
			Bitmap bmp = new Bitmap(width, height, PixelFormat.Format8bppIndexed);
			//Create a BitmapData and Lock all pixels to be written
			BitmapData bmpData =
				bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height),
										 ImageLockMode.WriteOnly, bmp.PixelFormat);

			// If you wanted to support formats other than 8bpp, you should use Bitmap.GetPixelFormatSize(bmp.PixelFormat) to adjust the array size
			byte[] pixels = new byte[bmpData.Stride * height];

			int iPixelsCounter = 0;
			for (int y = 0; y < height; y++)
			{
					int offset = y * width;
					for (int x = 0; x < width; x++)
					{
						pixels[iPixelsCounter++] = array[y][x] == BLACK ? BLACK : WHITE;
					}
					iPixelsCounter += bmpData.Stride - width;
			}

			//Copy the data from the byte array into BitmapData.Scan0
			System.Runtime.InteropServices.Marshal.Copy(pixels, 0, bmpData.Scan0, pixels.Length);

			//Unlock the pixels
			bmp.UnlockBits(bmpData);

			//Return the bitmap
			return bmp;
		}
	}
}