コード例 #1
0
 public void NullPixels()
 {
     try
     {
         _e = new LzwEncoder( null );
     }
     catch( ArgumentNullException ex )
     {
         Assert.AreEqual( "pixels", ex.ParamName );
         throw;
     }
 }
コード例 #2
0
 public void NullStream()
 {
     _e = new LzwEncoder( _ip );
     try
     {
         _e.Encode( null );
     }
     catch( ArgumentNullException ex )
     {
         Assert.AreEqual( "outputStream", ex.ParamName );
         throw;
     }
 }
コード例 #3
0
        /// <summary>
        /// Encodes _ip and decodes the encoded data, then compares the decoded
        /// data against the original.
        /// Also calculates the compression rate.
        /// </summary>
        private void TestIt()
        {
            MemoryStream s = new MemoryStream();
            _e = new LzwEncoder( _ip );
            _e.Encode( s );
            int encodedByteCount = (int) s.Position;

            s.Seek( 0, SeekOrigin.Begin );
            TableBasedImageData tbid = new TableBasedImageData( s, _ip.Count );

            s.Seek( 0, SeekOrigin.Begin );
            byte[] encodedBytes = new byte[encodedByteCount];
            s.Read( encodedBytes, 0, encodedByteCount );

            Assert.AreEqual( _ip.Count, tbid.Pixels.Count, "Pixel counts differ" );
            for( int i = 0; i < _ip.Count; i++ )
            {
                Assert.AreEqual( _ip[i], tbid.Pixels[i], "pixel index " + i );
            }

            float compression = 100 - (100 * encodedByteCount / _ip.Count);
            WriteMessage( "Original byte count: " + _ip.Count
                          + ". Encoded byte count: " + encodedByteCount
                          + ". Compression rate: " + compression + "%" );
        }
コード例 #4
0
		/// <summary>
		/// Encodes and writes pixel data to the supplied stream
		/// </summary>
		/// <param name="indexedPixels">
		/// Collection of indices of the pixel colours within the active colour 
		/// table.
		/// </param>
		/// <param name="outputStream">
		/// The stream to write to.
		/// </param>
		private static void WritePixels( IndexedPixels indexedPixels,
		                                 Stream outputStream )
		{
			LzwEncoder encoder = new LzwEncoder( indexedPixels );
			encoder.Encode( outputStream );
		}