public void TestC()
{
// else if (highestPaletteIndex >= 16 && highestPaletteIndex <= 31)
//{
// paletteBitSize = 5;//max 31 values;
BitStreamManager bs = new BitStreamManager();
bs.AddBit(true);
bs.AddBit(false);
bs.AddByte(28, 5);
byte[] values = bs.ToByteArray();
bs = new BitStreamManager(values);
Assert.IsTrue(bs.ReadBit());
Assert.IsFalse(bs.ReadBit());
Assert.AreEqual(28, bs.ReadValue(6));
//Assert.IsFalse(bs.ReadBit());
}
private void WriteAccumulatedColor(BitStreamManager bitStream, byte accumulatedSameColor)
{
if (accumulatedSameColor > 12)
{
//Add the change action bits:
// 11: Read the next 3 bit value, and perform an action, depending on the value:
bitStream.AddBit(true);
bitStream.AddBit(true);
//Add the count bit action code: 100 (4): Read next 8 bits. Draw the number of pixels specified by these 8 bits with the current palette index (somewhat similar to RLE).
bitStream.AddByte(4, 3);
//Add the number of pixels that will be draw with this color.
bitStream.AddByte(accumulatedSameColor);
}
else
{
for (int i = 0; i < accumulatedSameColor; i++)
{
bitStream.AddBit(false);
}
}
}
public void TestArrayBuildFromBitPopulated()
{
var bitStreamManager = new BitStreamManager();
//100 = 0110 0100
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(false);
//54 = 0011 0110
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(false);
bitStreamManager.AddBit(true);
bitStreamManager.AddBit(true);
//Deixa esses dois em branco, e o bitStream tem que preencher com 0s...
//bitStreamManager.AddBit(false);
//bitStreamManager.AddBit(false);
var sourceBytes = new byte[2];
sourceBytes[0] = 100; //0110 0100
sourceBytes[1] = 54; //
Assert.AreEqual(14, bitStreamManager.Lenght);
byte[] rebuildBytes = bitStreamManager.ToByteArray();
Assert.AreEqual(sourceBytes[0], rebuildBytes[0]);
Assert.AreEqual(sourceBytes[1], rebuildBytes[1]);
}
// lines
// encoded size : 16le
// line data : size bytes
private void Encode()
{
var result = new List <byte>();
_currentLine = 0;
//Primeira passagem - Cadastra tudo alternado
while (_currentLine < (_height))
{
var bitStream = new BitStreamManager();
var lineInformation = new List <SegmentInformation>();
var currentSegmentInformation = new SegmentInformation();
byte lastColorIndex = (byte)FindTableIndex(_imageToEncode.GetPixel(0, _currentLine));
if (lastColorIndex == (byte)FindTableIndex(_imageToEncode.GetPixel(1, _currentLine)))
{
currentSegmentInformation.RepeatSameColor = true;
}
currentSegmentInformation.Colors.Add(lastColorIndex);
for (int x = 1; x < _width; x++)
{
byte currentColorIndex = (byte)FindTableIndex(_imageToEncode.GetPixel(x, _currentLine));
if (currentColorIndex != lastColorIndex)
{
if (currentSegmentInformation.RepeatSameColor)
{
//Mudou de REPETIR para NÃO REPETIR
lineInformation.Add(currentSegmentInformation);
currentSegmentInformation = new SegmentInformation();
currentSegmentInformation.RepeatSameColor = false;
}
}
else
{
if (!currentSegmentInformation.RepeatSameColor)
{
//Mudou de NÃO REPETIR para REPETIR
lineInformation.Add(currentSegmentInformation);
currentSegmentInformation = new SegmentInformation();
currentSegmentInformation.RepeatSameColor = true;
}
}
currentSegmentInformation.Colors.Add(currentColorIndex);
lastColorIndex = currentColorIndex;
}
lineInformation.Add(currentSegmentInformation);
//Segunda passagem - verifica a lista de itens não repetidos para ver se o ultimo elemento é um elemento da lista repetida seguinte.
for (int i = 1; i < lineInformation.Count; i++)
{
var previous = lineInformation[i - 1];
var previousLastIndex = previous.Colors.Count - 1;
var current = lineInformation[i - 1];
if (!previous.RepeatSameColor && current.RepeatSameColor && previous.Colors[previousLastIndex] == current.Colors[0])
{
//move o item da lista anterior para a lista atual
current.Colors.Insert(0, previous.Colors[previousLastIndex]);
previous.Colors.RemoveAt(previousLastIndex);
}
}
//Terceira passagem - procura por listas que eventualmente ficaram vazias, e as remove.
//É importante percorrer a lista ao contrários, caso contrário a lista sera lida errada, além de dar IndexOutOfBounds no final.
for (int i = lineInformation.Count - 1; i >= 0; i--)
{
if (lineInformation[i].Colors.Count == 0)
{
lineInformation.RemoveAt(i);
}
}
//Quarta passagem, divide as listas com mais de 128 itens em varias listas, pois 128 é o limite máximo de 7 bits + 1.
var finalLineInformation = new List <SegmentInformation>();
foreach (SegmentInformation segmentInformation in lineInformation)
{
if (segmentInformation.Colors.Count > 128)
{
while (segmentInformation.Colors.Count > 128)
{
var dividedLineInformation = new SegmentInformation();
dividedLineInformation.RepeatSameColor = segmentInformation.RepeatSameColor;
dividedLineInformation.Colors.AddRange(segmentInformation.Colors.Take(128).ToArray());
finalLineInformation.Add(dividedLineInformation);
segmentInformation.Colors = segmentInformation.Colors.Skip(128).ToList();
}
}
finalLineInformation.Add(segmentInformation);
}
//Quinta passagem, grava o BitStream.
foreach (SegmentInformation segmentInformation in finalLineInformation)
{
bitStream.AddBit(segmentInformation.RepeatSameColor);
if (segmentInformation.RepeatSameColor)
{
bitStream.AddByte((byte)(segmentInformation.Colors.Count - 1), 7);
bitStream.AddByte(segmentInformation.Colors[0]);
}
else
{
bitStream.AddByte((byte)(segmentInformation.Colors.Count - 1), 7);
foreach (byte differentLine in segmentInformation.Colors)
{
bitStream.AddByte(differentLine);
}
}
}
_currentLine++;
byte[] encodedLine = bitStream.ToByteArray();
result.AddRange(BinaryHelper.UInt16ToBytes((ushort)encodedLine.Length));
result.AddRange(encodedLine);
}
_imageBomp.Data = result.ToArray();
}
private StripData EncodeCompressedMethod2()
{
var strip = new StripData();
var bitStream = new BitStreamManager();
bool transparent;
int paletteSize;
VerifyStrip(out transparent, out paletteSize, true);
bool alternateCode = EncodeSettings == EncodeTypeSettings.Method2AlternateCode;
strip.CodecId = (byte)(GetSubstractionCode(transparent, true, CompressionTypes.Method2, alternateCode) + paletteSize);
if (strip.CompressionType == CompressionTypes.Unknow)
{
strip.CodecId = (byte)(GetSubstractionCode(transparent, true, CompressionTypes.Method2, !alternateCode) + paletteSize);
}
_renderdingDirection = strip.RenderdingDirection;
_currentLocation.X = 0;
_currentLocation.Y = 0;
//Color currentColor = GetNextPixel(); //pq isso fica menos errado!?
Color currentColor = _imageToEncode.GetPixel(_currentOffset + 0, 0);
int currentPaletteIndex = FindTableIndex(currentColor);
bitStream.AddByte((byte)currentPaletteIndex);
byte accumulatedSameColor = 0;
while (!(_currentLocation.X == 7 && _currentLocation.Y == (_height - 1)))
{
var newPaletteIndex = FindTableIndex(GetNextPixel());
if (newPaletteIndex == currentPaletteIndex)
{
accumulatedSameColor++; //Add one to the count of pixels with the same color.
if (accumulatedSameColor == 255)
{
//If we have pixels with the previous color drawed before the color change
//We need to write that information to the data, before process the new color.
WriteAccumulatedColor(bitStream, accumulatedSameColor);
accumulatedSameColor = 0;
}
}
else
{
if (accumulatedSameColor > 0)
{
//If we have pixels with the previous color drawed before the color change
//We need to write that information to the data, before process the new color.
WriteAccumulatedColor(bitStream, accumulatedSameColor);
accumulatedSameColor = 0;
}
/*
* Then discory the new bit code.
*
* 10: Read a new palette index from the bitstream (i.e., the number of bits specified by the parameter), and draw the next pixel.
* 11: Read the next 3 bit value, and perform an action, depending on the value:
* 000 (0): Decrease current palette index by 4.
* 001 (1): Decrease current palette index by 3.
* 010 (2): Decrease current palette index by 2.
* 011 (3): Decrease current palette index by 1.
* 100 (4): Read next 8 bits. Draw the number of pixels specified by these 8 bits with the current palette index (somewhat similar to RLE).
* 101 (5): Increase current palette index by 1.
* 110 (6): Increase current palette index by 2.
* 111 (7): Increase current palette index by 3.
*/
bitStream.AddBit(true); //Add the change action bit
if ((newPaletteIndex < (currentPaletteIndex - 4)) || (newPaletteIndex > (currentPaletteIndex + 3)))
{
//reset the negation value, read the next index from the palette,
//and draw the pixel.
bitStream.AddBit(false);
bitStream.AddByte((byte)newPaletteIndex, paletteSize);
}
else
{
//Add the read code bit
bitStream.AddBit(true);
if (newPaletteIndex == (currentPaletteIndex - 4)) //000 (0): Decrease current palette index by 4.
{
//Add the code 0
bitStream.AddByte(0, 3);
}
else if (newPaletteIndex == (currentPaletteIndex - 3)) //001 (1): Decrease current palette index by 3.
{
//Add the code 1
bitStream.AddByte(1, 3);
}
else if (newPaletteIndex == (currentPaletteIndex - 2)) //010 (2): Decrease current palette index by 2.
{
//Add the code 2
bitStream.AddByte(2, 3);
}
else if (newPaletteIndex == (currentPaletteIndex - 1)) //011 (3): Decrease current palette index by 1.
{
//Add the code 3
bitStream.AddByte(3, 3);
}
else if (newPaletteIndex == (currentPaletteIndex + 1)) //101 (5): Increase current palette index by 1.
{
//Add the code 5
bitStream.AddByte(5, 3);
}
else if (newPaletteIndex == (currentPaletteIndex + 2)) //110 (6): Increase current palette index by 2.
{
//Add the code 6
bitStream.AddByte(6, 3);
}
else if (newPaletteIndex == (currentPaletteIndex + 3)) //111 (7): Increase current palette index by 3.
{
//Add the code 7
bitStream.AddByte(7, 3);
}
else
{
throw new ImageEncodeException("nao podia ter caido aqui");
}
}
currentPaletteIndex = newPaletteIndex;
}
}
//if the loop terminated with accumulated bits pending, add these to the stream.
if (accumulatedSameColor > 0)
{
//If we have pixels with the previous color drawed before the color change
//We need to write that information to the data, before process the new color.
WriteAccumulatedColor(bitStream, accumulatedSameColor);
}
strip.ImageData = bitStream.ToByteArray();
return(strip);
}
private StripData EncodeCompressedMethod1(bool horizontalDirection)
{
var strip = new StripData();
var bitStream = new BitStreamManager();
bool transparent;
int paletteSize;
VerifyStrip(out transparent, out paletteSize, true);
strip.CodecId = (byte)(GetSubstractionCode(transparent, horizontalDirection, CompressionTypes.Method1) + paletteSize);
_renderdingDirection = strip.RenderdingDirection;
_currentLocation.X = 0;
_currentLocation.Y = 0;
int negationValue = 1;
//Color currentColor = GetNextPixel(); //pq isso fica menos errado!?
Color currentColor = _imageToEncode.GetPixel(_currentOffset + 0, 0);
int currentPaletteIndex = FindTableIndex(currentColor);
bitStream.AddByte((byte)currentPaletteIndex);
while (!(_currentLocation.X == 7 && _currentLocation.Y == (_height - 1)))
{
var newPaletteIndex = FindTableIndex(GetNextPixel());
if (newPaletteIndex == currentPaletteIndex)
{
bitStream.AddBit(false); //continue Drawing the same color.
}
else
{
bitStream.AddBit(true); //discover what to do.
if (newPaletteIndex == (currentPaletteIndex - negationValue))
{
//subtract the negation value from the palette and draw the next pixel;
bitStream.AddBit(true);
bitStream.AddBit(false);
}
else if (newPaletteIndex == (currentPaletteIndex - (negationValue * -1)))
{
//invert the negation value, subtract it from the palette
//and draw the next pixel;
negationValue *= -1;
bitStream.AddBit(true);
bitStream.AddBit(true);
}
else
{
//reset the negation value, read the next index from the palette,
//and draw the pixel.
negationValue = 1;
bitStream.AddBit(false);
bitStream.AddByte((byte)newPaletteIndex, paletteSize);
}
currentPaletteIndex = newPaletteIndex;
}
}
strip.ImageData = bitStream.ToByteArray();
return(strip);
}
