Issue 921 add ToBitmap

git-svn-id: https://zxing.googlecode.com/svn/trunk@1864 59b500cc-1b3d-0410-9834-0bbf25fbcc57

csharp/common/ByteMatrix.cs

@@ -14,6 +14,9 @@
 * limitations under the License.
 */
 using System;
+using System.Drawing.Imaging;
+using System.Drawing;
+using System.Runtime.InteropServices;
 namespace com.google.zxing.common
 {
 	
@@ -127,5 +130,45 @@ namespace com.google.zxing.common
 			}
 			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;
+      byte[] pixels = new byte[width * height];
+
+      for (int y = 0; y < height; y++)
+      {
+        int offset = y * width;
+        for (int x = 0; x < width; x++)
+        {
+           ixels[offset + x] = array[y][x] == 0 ? BLACK : WHITE;
+        }
+      }
+
+      //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);
+
+      //Copy the data from the byte array into BitmapData.Scan0
+      Marshal.Copy(pixels, 0, bmpData.Scan0, pixels.Length);
+
+      //Unlock the pixels
+      bmp.UnlockBits(bmpData);
+
+      //Return the bitmap
+      return bmp;
+    }
 	}
 }