// /// <summary>
// /// Tests the encoder with 1,000,000 random pixel values.
// /// </summary>
// [Test]
// public void Test1000000Pixels()
// {
// ReportStart();
// RandomFill( 1000000 );
// ReportEnd();
// }
#endregion
#region private RandomFill method
/// <summary>
/// Fills _ip with random values
/// </summary>
/// <param name="count">
/// Number of values to add
/// </param>
private void RandomFill(int count)
{
Random r = new Random();
for (int blockiness = 1; blockiness < 20; blockiness++)
{
_ip = new IndexedPixels();
byte[] bytes = new byte[count];
r.NextBytes(bytes);
byte lastByte = 0;
foreach (byte b in bytes)
{
// Add a new value to the collection only if we throw a 1
int diceThrow = r.Next(1, blockiness);
if (diceThrow == 1)
{
_ip.Add(b);
lastByte = b;
}
else
{
// otherwise add the previous value again
// (this more accurately simulates colour distribution in
// an actual image)
_ip.Add(lastByte);
}
}
TestIt();
}
}
public void DefaultConstructor()
{
ReportStart();
byte[] bytes = new byte[] { 24, 39, 2 };
// Test the constructor
_ip = new IndexedPixels();
// Test the Add method
foreach (byte b in bytes)
{
_ip.Add(b);
}
Assert.AreEqual(bytes.Length, _ip.Count);
// Test the get accessor of the indexer
for (int i = 0; i < bytes.Length; i++)
{
Assert.AreEqual(bytes[i], _ip[i]);
}
// Test the set accessor of the indexer
_ip[1] = 246;
Assert.AreEqual(246, _ip[1]);
ReportEnd();
}
/// <summary>
/// Gets the indices of the colours of each of the supplied pixels
/// within the colour table.
/// </summary>
/// <param name="pixelColours">
/// A collection of the colours for which to get the indices in the
/// colour table.
/// </param>
/// <returns>
/// A collection of the indices of the colours of each of the supplied
/// pixels within the colour table.
/// </returns>
private IndexedPixels GetIndexedPixels(Color[] pixelColours)
{
IndexedPixels indexedPixels = new IndexedPixels();
// Take a copy of the distinct colours to make the IndexOf method
// available
string copyDistinctColoursCounterText = "Copying distinct colours";
AddCounter(copyDistinctColoursCounterText, _distinctColours.Count);
Collection <Color> distinctColours = new Collection <Color>();
foreach (Color c in _distinctColours.Keys)
{
MyProgressCounters[copyDistinctColoursCounterText].Value++;
distinctColours.Add(c);
}
RemoveCounter(copyDistinctColoursCounterText);
int indexInColourTable;
int red;
int green;
int blue;
int numberOfPixels = pixelColours.Length;
string indexingPixelsCounterText
= "Mapping colours to indices in colour table";
AddCounter(indexingPixelsCounterText, numberOfPixels);
for (int i = 0; i < numberOfPixels; i++)
{
MyProgressCounters[indexingPixelsCounterText].Value = i;
red = pixelColours[i].R;
green = pixelColours[i].G;
blue = pixelColours[i].B;
// Get the index in the colour table of the colour of this pixel
if (_distinctColours.Count > 256)
{
indexInColourTable = _nq.Map(red, green, blue);
}
else
{
indexInColourTable = distinctColours.IndexOf(pixelColours[i]);
}
indexedPixels.Add((byte)indexInColourTable);
}
RemoveCounter(indexingPixelsCounterText);
return(indexedPixels);
}
public void CapacityConstructorAdd()
{
ReportStart();
_ip = new IndexedPixels(3);
try
{
_ip.Add(1);
}
catch (NotSupportedException ex)
{
string message
= "You cannot add pixels to this instance because it was "
+ "instantiated with a fixed size.";
StringAssert.Contains(message, ex.Message);
ReportEnd();
throw;
}
}
/// <summary>
/// Converts the supplied image to a collection of pixel indices using
/// the supplied colour table.
/// Only used when the QuantizerType is set to UseSuppliedPalette
/// </summary>
/// <param name="act">The active colour table</param>
/// <param name="image">The image</param>
/// <returns></returns>
private IndexedPixels MakeIndexedPixels(ColourTable act, Image image)
{
//AddCounter( counterText, pixelCount );
Bitmap bitmap = (Bitmap)image;
IndexedPixels ip = new IndexedPixels();
for (int y = 0; y < image.Height; y++)
{
for (int x = 0; x < image.Width; x++)
{
Color c = bitmap.GetPixel(x, y);
int index = FindClosest(c, act);
ip.Add((byte)index);
//MyProgressCounters[counterText].Value = ip.Count;
}
}
//RemoveCounter( counterText );
return(ip);
}
public void BlockTerminatorTest()
{
ReportStart();
byte[] bytes = new byte[]
{
0x08, // LZW minimum code size
0x05, // block size = 5
// 5 bytes of LZW encoded data follows
0x00, 0x51, 0xFC, 0x1B, 0x28,
0x06, // block size = 6
// 6 bytes of LZW encoded data follows
0x70, 0xA0, 0xC1, 0x83, 0x01, 0x01,
0x00, // block terminator - end of table based image data
};
MemoryStream s = new MemoryStream();
s.Write( bytes, 0, bytes.Length );
s.Seek( 0, SeekOrigin.Begin );
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData( s, pixelCount );
Assert.AreEqual( ErrorState.Ok, _tbid.ConsolidatedState );
Assert.AreEqual( 15, _tbid.Pixels.Count );
Assert.AreEqual( ErrorState.Ok, _tbid.ConsolidatedState );
Assert.AreEqual( 8, _tbid.LzwMinimumCodeSize );
Assert.AreEqual( 9, _tbid.InitialCodeSize );
Assert.AreEqual( Math.Pow( 2, 8 ), _tbid.ClearCode );
Assert.AreEqual( Math.Pow( 2, 8 ) + 1, _tbid.EndOfInformation );
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add( 40 ); // first pixel is black - index 0 in colour table
expectedIndices.Add( 255 ); // 2nd pixel is white - index 255 in colour table
expectedIndices.Add( 255 ); // 3rd pixel
expectedIndices.Add( 255 ); // 4th pixel
expectedIndices.Add( 40 ); // 5th pixel
expectedIndices.Add( 255 ); // 6th pixel
expectedIndices.Add( 255 ); // 7th pixel
expectedIndices.Add( 255 ); // 8th pixel
expectedIndices.Add( 255 ); // 9th pixel
expectedIndices.Add( 255 ); // 10th pixel
expectedIndices.Add( 255 ); // 11th pixel
expectedIndices.Add( 255 ); // 12th pixel
expectedIndices.Add( 255 ); // 13th pixel
expectedIndices.Add( 255 ); // 14th pixel
expectedIndices.Add( 255 ); // 15th pixel
for( int i = 0; i < 15; i++ )
{
Assert.AreEqual( expectedIndices[i], _tbid.Pixels[i], "pixel " + i );
}
ReportEnd();
}
private void MissingPixels( bool xmlDebugging )
{
byte[] bytes = WikipediaExample.ImageDataBytes;
MemoryStream s = new MemoryStream();
s.Write( bytes, 0, bytes.Length );
s.Seek( 0, SeekOrigin.Begin );
// The stream contains 15 pixels, this image size implies 18 pixels
_tbid = new TableBasedImageData( s, 18, xmlDebugging );
Assert.AreEqual( 18, _tbid.Pixels.Count );
Assert.AreEqual( ErrorState.TooFewPixelsInImageData, _tbid.ConsolidatedState );
Assert.AreEqual( 8, _tbid.LzwMinimumCodeSize );
Assert.AreEqual( 9, _tbid.InitialCodeSize );
Assert.AreEqual( Math.Pow( 2, 8 ), _tbid.ClearCode );
Assert.AreEqual( Math.Pow( 2, 8 ) + 1, _tbid.EndOfInformation );
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add( 0 ); // first pixel is black - index 0 in colour table
expectedIndices.Add( 1 ); // 2nd pixel is white - index 1 in colour table
expectedIndices.Add( 1 ); // 3rd pixel
expectedIndices.Add( 1 ); // 4th pixel
expectedIndices.Add( 0 ); // 5th pixel
expectedIndices.Add( 1 ); // 6th pixel
expectedIndices.Add( 1 ); // 7th pixel
expectedIndices.Add( 1 ); // 8th pixel
expectedIndices.Add( 1 ); // 9th pixel
expectedIndices.Add( 1 ); // 10th pixel
expectedIndices.Add( 1 ); // 11th pixel
expectedIndices.Add( 1 ); // 12th pixel
expectedIndices.Add( 1 ); // 13th pixel
expectedIndices.Add( 1 ); // 14th pixel
expectedIndices.Add( 1 ); // 15th pixel
expectedIndices.Add( 0 ); // 16th pixel
expectedIndices.Add( 0 ); // 17th pixel
expectedIndices.Add( 0 ); // 18th pixel
for( int i = 0; i < 18; i++ )
{
Assert.AreEqual( expectedIndices[i], _tbid.Pixels[i], "pixel " + i );
}
}
private void DataBlockTooShort( bool xmlDebugging )
{
byte[] bytes = new byte[]
{
0x08, // LZW minimum code size
0x0b, // block size = 11
// 11 bytes of LZW encoded data follows (actually there's only 10 for this test)
0x00, 0x51, 0xFC, 0x1B, 0x28, 0x70, 0xA0, 0xC1, 0x83, 0x01, //0x01,
// 0x00 // block terminator
};
MemoryStream s = new MemoryStream();
s.Write( bytes, 0, bytes.Length );
s.Seek( 0, SeekOrigin.Begin );
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData( s, pixelCount, xmlDebugging );
Assert.AreEqual( 15, _tbid.Pixels.Count );
Assert.AreEqual( ErrorState.DataBlockTooShort | ErrorState.TooFewPixelsInImageData, _tbid.ConsolidatedState );
Assert.AreEqual( 8, _tbid.LzwMinimumCodeSize );
Assert.AreEqual( 9, _tbid.InitialCodeSize );
Assert.AreEqual( Math.Pow( 2, 8 ), _tbid.ClearCode );
Assert.AreEqual( Math.Pow( 2, 8 ) + 1, _tbid.EndOfInformation );
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add( 0 ); // first pixel
expectedIndices.Add( 0 ); // 2nd pixel
expectedIndices.Add( 0 ); // 3rd pixel
expectedIndices.Add( 0 ); // 4th pixel
expectedIndices.Add( 0 ); // 5th pixel
expectedIndices.Add( 0 ); // 6th pixel
expectedIndices.Add( 0 ); // 7th pixel
expectedIndices.Add( 0 ); // 8th pixel
expectedIndices.Add( 0 ); // 9th pixel
expectedIndices.Add( 0 ); // 10th pixel
expectedIndices.Add( 0 ); // 11th pixel
expectedIndices.Add( 0 ); // 12th pixel
expectedIndices.Add( 0 ); // 13th pixel
expectedIndices.Add( 0 ); // 14th pixel
expectedIndices.Add( 0 ); // 15th pixel
for( int i = 0; i < 15; i++ )
{
Assert.AreEqual( expectedIndices[i], _tbid.Pixels[i], "pixel " + i );
}
if( xmlDebugging )
{
Assert.AreEqual( ExpectedDebugXml, _tbid.DebugXml );
}
}
private void CodeNotInDictionary( bool xmlDebugging )
{
byte[] bytes = WikipediaExample.ImageDataBytes;
bytes[4] = 0xFF; // put an unexpected code into the stream
MemoryStream s = new MemoryStream();
s.Write( bytes, 0, bytes.Length );
s.Seek( 0, SeekOrigin.Begin );
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData( s, pixelCount, xmlDebugging );
Assert.IsTrue( _tbid.TestState( ErrorState.CodeNotInDictionary ) );
Assert.AreEqual( 15, _tbid.Pixels.Count );
Assert.AreEqual( 8, _tbid.LzwMinimumCodeSize );
Assert.AreEqual( 9, _tbid.InitialCodeSize );
Assert.AreEqual( Math.Pow( 2, 8 ), _tbid.ClearCode );
Assert.AreEqual( Math.Pow( 2, 8 ) + 1, _tbid.EndOfInformation );
IndexedPixels expectedIndices = new IndexedPixels();
// Check all the pixels have been zero-filled
expectedIndices.Add( 0 ); // first pixel
expectedIndices.Add( 0 ); // 2nd pixel
expectedIndices.Add( 0 ); // 3rd pixel
expectedIndices.Add( 0 ); // 4th pixel
expectedIndices.Add( 0 ); // 5th pixel
expectedIndices.Add( 0 ); // 6th pixel
expectedIndices.Add( 0 ); // 7th pixel
expectedIndices.Add( 0 ); // 8th pixel
expectedIndices.Add( 0 ); // 9th pixel
expectedIndices.Add( 0 ); // 10th pixel
expectedIndices.Add( 0 ); // 11th pixel
expectedIndices.Add( 0 ); // 12th pixel
expectedIndices.Add( 0 ); // 13th pixel
expectedIndices.Add( 0 ); // 14th pixel
expectedIndices.Add( 0 ); // 15th pixel
for( int i = 0; i < 15; i++ )
{
Assert.AreEqual( expectedIndices[i], _tbid.Pixels[i], "pixel " + i );
}
if( xmlDebugging )
{
Assert.AreEqual( ExpectedDebugXml, _tbid.DebugXml );
}
}
/// <summary>
/// Fills _ip with random values
/// </summary>
/// <param name="count">
/// Number of values to add
/// </param>
private void RandomFill( int count )
{
Random r = new Random();
for( int blockiness = 1; blockiness < 20; blockiness++ )
{
_ip = new IndexedPixels();
byte[] bytes = new byte[count];
r.NextBytes( bytes );
byte lastByte = 0;
foreach( byte b in bytes )
{
// Add a new value to the collection only if we throw a 1
int diceThrow = r.Next( 1, blockiness );
if( diceThrow == 1 )
{
_ip.Add( b );
lastByte = b;
}
else
{
// otherwise add the previous value again
// (this more accurately simulates colour distribution in
// an actual image)
_ip.Add( lastByte );
}
}
TestIt();
}
}
private void DataBlockTooShort(bool xmlDebugging)
{
byte[] bytes = new byte[]
{
0x08, // LZW minimum code size
0x0b, // block size = 11
// 11 bytes of LZW encoded data follows (actually there's only 10 for this test)
0x00, 0x51, 0xFC, 0x1B, 0x28, 0x70, 0xA0, 0xC1, 0x83, 0x01, //0x01,
// 0x00 // block terminator
};
MemoryStream s = new MemoryStream();
s.Write(bytes, 0, bytes.Length);
s.Seek(0, SeekOrigin.Begin);
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData(s, pixelCount, xmlDebugging);
Assert.AreEqual(15, _tbid.Pixels.Count);
Assert.AreEqual(ErrorState.DataBlockTooShort | ErrorState.TooFewPixelsInImageData, _tbid.ConsolidatedState);
Assert.AreEqual(8, _tbid.LzwMinimumCodeSize);
Assert.AreEqual(9, _tbid.InitialCodeSize);
Assert.AreEqual(Math.Pow(2, 8), _tbid.ClearCode);
Assert.AreEqual(Math.Pow(2, 8) + 1, _tbid.EndOfInformation);
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add(0); // first pixel
expectedIndices.Add(0); // 2nd pixel
expectedIndices.Add(0); // 3rd pixel
expectedIndices.Add(0); // 4th pixel
expectedIndices.Add(0); // 5th pixel
expectedIndices.Add(0); // 6th pixel
expectedIndices.Add(0); // 7th pixel
expectedIndices.Add(0); // 8th pixel
expectedIndices.Add(0); // 9th pixel
expectedIndices.Add(0); // 10th pixel
expectedIndices.Add(0); // 11th pixel
expectedIndices.Add(0); // 12th pixel
expectedIndices.Add(0); // 13th pixel
expectedIndices.Add(0); // 14th pixel
expectedIndices.Add(0); // 15th pixel
for (int i = 0; i < 15; i++)
{
Assert.AreEqual(expectedIndices[i], _tbid.Pixels[i], "pixel " + i);
}
if (xmlDebugging)
{
Assert.AreEqual(ExpectedDebugXml, _tbid.DebugXml);
}
}
private void CodeNotInDictionary(bool xmlDebugging)
{
byte[] bytes = WikipediaExample.ImageDataBytes;
bytes[4] = 0xFF; // put an unexpected code into the stream
MemoryStream s = new MemoryStream();
s.Write(bytes, 0, bytes.Length);
s.Seek(0, SeekOrigin.Begin);
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData(s, pixelCount, xmlDebugging);
Assert.IsTrue(_tbid.TestState(ErrorState.CodeNotInDictionary));
Assert.AreEqual(15, _tbid.Pixels.Count);
Assert.AreEqual(8, _tbid.LzwMinimumCodeSize);
Assert.AreEqual(9, _tbid.InitialCodeSize);
Assert.AreEqual(Math.Pow(2, 8), _tbid.ClearCode);
Assert.AreEqual(Math.Pow(2, 8) + 1, _tbid.EndOfInformation);
IndexedPixels expectedIndices = new IndexedPixels();
// Check all the pixels have been zero-filled
expectedIndices.Add(0); // first pixel
expectedIndices.Add(0); // 2nd pixel
expectedIndices.Add(0); // 3rd pixel
expectedIndices.Add(0); // 4th pixel
expectedIndices.Add(0); // 5th pixel
expectedIndices.Add(0); // 6th pixel
expectedIndices.Add(0); // 7th pixel
expectedIndices.Add(0); // 8th pixel
expectedIndices.Add(0); // 9th pixel
expectedIndices.Add(0); // 10th pixel
expectedIndices.Add(0); // 11th pixel
expectedIndices.Add(0); // 12th pixel
expectedIndices.Add(0); // 13th pixel
expectedIndices.Add(0); // 14th pixel
expectedIndices.Add(0); // 15th pixel
for (int i = 0; i < 15; i++)
{
Assert.AreEqual(expectedIndices[i], _tbid.Pixels[i], "pixel " + i);
}
if (xmlDebugging)
{
Assert.AreEqual(ExpectedDebugXml, _tbid.DebugXml);
}
}
private void MissingPixels(bool xmlDebugging)
{
byte[] bytes = WikipediaExample.ImageDataBytes;
MemoryStream s = new MemoryStream();
s.Write(bytes, 0, bytes.Length);
s.Seek(0, SeekOrigin.Begin);
// The stream contains 15 pixels, this image size implies 18 pixels
_tbid = new TableBasedImageData(s, 18, xmlDebugging);
Assert.AreEqual(18, _tbid.Pixels.Count);
Assert.AreEqual(ErrorState.TooFewPixelsInImageData, _tbid.ConsolidatedState);
Assert.AreEqual(8, _tbid.LzwMinimumCodeSize);
Assert.AreEqual(9, _tbid.InitialCodeSize);
Assert.AreEqual(Math.Pow(2, 8), _tbid.ClearCode);
Assert.AreEqual(Math.Pow(2, 8) + 1, _tbid.EndOfInformation);
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add(0); // first pixel is black - index 0 in colour table
expectedIndices.Add(1); // 2nd pixel is white - index 1 in colour table
expectedIndices.Add(1); // 3rd pixel
expectedIndices.Add(1); // 4th pixel
expectedIndices.Add(0); // 5th pixel
expectedIndices.Add(1); // 6th pixel
expectedIndices.Add(1); // 7th pixel
expectedIndices.Add(1); // 8th pixel
expectedIndices.Add(1); // 9th pixel
expectedIndices.Add(1); // 10th pixel
expectedIndices.Add(1); // 11th pixel
expectedIndices.Add(1); // 12th pixel
expectedIndices.Add(1); // 13th pixel
expectedIndices.Add(1); // 14th pixel
expectedIndices.Add(1); // 15th pixel
expectedIndices.Add(0); // 16th pixel
expectedIndices.Add(0); // 17th pixel
expectedIndices.Add(0); // 18th pixel
for (int i = 0; i < 18; i++)
{
Assert.AreEqual(expectedIndices[i], _tbid.Pixels[i], "pixel " + i);
}
}
public void BlockTerminatorTest()
{
ReportStart();
byte[] bytes = new byte[]
{
0x08, // LZW minimum code size
0x05, // block size = 5
// 5 bytes of LZW encoded data follows
0x00, 0x51, 0xFC, 0x1B, 0x28,
0x06, // block size = 6
// 6 bytes of LZW encoded data follows
0x70, 0xA0, 0xC1, 0x83, 0x01, 0x01,
0x00, // block terminator - end of table based image data
};
MemoryStream s = new MemoryStream();
s.Write(bytes, 0, bytes.Length);
s.Seek(0, SeekOrigin.Begin);
int pixelCount = WikipediaExample.FrameSize.Width
* WikipediaExample.FrameSize.Height;
_tbid = new TableBasedImageData(s, pixelCount);
Assert.AreEqual(ErrorState.Ok, _tbid.ConsolidatedState);
Assert.AreEqual(15, _tbid.Pixels.Count);
Assert.AreEqual(ErrorState.Ok, _tbid.ConsolidatedState);
Assert.AreEqual(8, _tbid.LzwMinimumCodeSize);
Assert.AreEqual(9, _tbid.InitialCodeSize);
Assert.AreEqual(Math.Pow(2, 8), _tbid.ClearCode);
Assert.AreEqual(Math.Pow(2, 8) + 1, _tbid.EndOfInformation);
IndexedPixels expectedIndices = new IndexedPixels();
expectedIndices.Add(40); // first pixel is black - index 0 in colour table
expectedIndices.Add(255); // 2nd pixel is white - index 255 in colour table
expectedIndices.Add(255); // 3rd pixel
expectedIndices.Add(255); // 4th pixel
expectedIndices.Add(40); // 5th pixel
expectedIndices.Add(255); // 6th pixel
expectedIndices.Add(255); // 7th pixel
expectedIndices.Add(255); // 8th pixel
expectedIndices.Add(255); // 9th pixel
expectedIndices.Add(255); // 10th pixel
expectedIndices.Add(255); // 11th pixel
expectedIndices.Add(255); // 12th pixel
expectedIndices.Add(255); // 13th pixel
expectedIndices.Add(255); // 14th pixel
expectedIndices.Add(255); // 15th pixel
for (int i = 0; i < 15; i++)
{
Assert.AreEqual(expectedIndices[i], _tbid.Pixels[i], "pixel " + i);
}
ReportEnd();
}
public void Test1Pixel1()
{
ReportStart();
_ip.Add(0);
TestIt();
ReportEnd();
}
/// <summary>
/// Gets the indices of the colours of each of the supplied pixels
/// within the colour table.
/// </summary>
/// <param name="pixelColours">
/// A collection of the colours for which to get the indices in the
/// colour table.
/// </param>
/// <returns>
/// A collection of the indices of the colours of each of the supplied
/// pixels within the colour table.
/// </returns>
private IndexedPixels GetIndexedPixels( Color[] pixelColours )
{
IndexedPixels indexedPixels = new IndexedPixels();
// Take a copy of the distinct colours to make the IndexOf method
// available
string copyDistinctColoursCounterText = "Copying distinct colours";
AddCounter( copyDistinctColoursCounterText, _distinctColours.Count );
Collection<Color> distinctColours = new Collection<Color>();
foreach( Color c in _distinctColours.Keys )
{
MyProgressCounters[copyDistinctColoursCounterText].Value++;
distinctColours.Add( c );
}
RemoveCounter( copyDistinctColoursCounterText );
int indexInColourTable;
int red;
int green;
int blue;
int numberOfPixels = pixelColours.Length;
string indexingPixelsCounterText
= "Mapping colours to indices in colour table";
AddCounter( indexingPixelsCounterText, numberOfPixels );
for( int i = 0; i < numberOfPixels; i++ )
{
MyProgressCounters[indexingPixelsCounterText].Value = i;
red = pixelColours[i].R;
green = pixelColours[i].G;
blue = pixelColours[i].B;
// Get the index in the colour table of the colour of this pixel
if( _distinctColours.Count > 256 )
{
indexInColourTable = _nq.Map( red, green, blue );
}
else
{
indexInColourTable = distinctColours.IndexOf( pixelColours[i] );
}
indexedPixels.Add( (byte) indexInColourTable );
}
RemoveCounter( indexingPixelsCounterText );
return indexedPixels;
}
/// <summary>
/// Converts the supplied image to a collection of pixel indices using
/// the supplied colour table.
/// Only used when the QuantizerType is set to UseSuppliedPalette
/// </summary>
/// <param name="act">The active colour table</param>
/// <param name="image">The image</param>
/// <returns></returns>
private IndexedPixels MakeIndexedPixels( ColourTable act, Image image )
{
int pixelCount = image.Height * image.Width;
string counterText = "Getting indices in colour table";
AddCounter( counterText, pixelCount );
Bitmap bitmap = (Bitmap) image;
IndexedPixels ip = new IndexedPixels();
for( int y = 0; y < image.Height; y++ )
{
for( int x = 0; x < image.Width; x++ )
{
Color c = bitmap.GetPixel( x, y );
int index = FindClosest( c, act );
ip.Add( (byte) index );
MyProgressCounters[counterText].Value = ip.Count;
}
}
RemoveCounter( counterText );
return ip;
}