public RunLengthTwoParts RunLengthEncodeForDvd(Color background, Color pattern, Color emphasis1, Color emphasis2)
{
var backgroundBuffer = new byte[4];
backgroundBuffer[0] = background.B;
backgroundBuffer[1] = background.G;
backgroundBuffer[2] = background.R;
backgroundBuffer[3] = background.A;
var patternBuffer = new byte[4];
patternBuffer[0] = pattern.B;
patternBuffer[1] = pattern.G;
patternBuffer[2] = pattern.R;
patternBuffer[3] = pattern.A;
var emphasis1Buffer = new byte[4];
emphasis1Buffer[0] = emphasis1.B;
emphasis1Buffer[1] = emphasis1.G;
emphasis1Buffer[2] = emphasis1.R;
emphasis1Buffer[3] = emphasis1.A;
var emphasis2Buffer = new byte[4];
emphasis2Buffer[0] = emphasis2.B;
emphasis2Buffer[1] = emphasis2.G;
emphasis2Buffer[2] = emphasis2.R;
emphasis2Buffer[3] = emphasis2.A;
var bufferEqual = new byte[Width * Height];
var bufferUnEqual = new byte[Width * Height];
int indexBufferEqual = 0;
int indexBufferUnEqual = 0;
_pixelAddress = -4;
for (int y = 0; y < Height; y++)
{
int index;
byte[] buffer;
if (y % 2 == 0)
{
index = indexBufferEqual;
buffer = bufferEqual;
}
else
{
index = indexBufferUnEqual;
buffer = bufferUnEqual;
}
var indexHalfNibble = false;
var lastColor = -1;
var count = 0;
for (int x = 0; x < Width; x++)
{
int color = GetDvdColor(patternBuffer, emphasis1Buffer, emphasis2Buffer);
if (lastColor == -1)
{
lastColor = color;
count = 1;
}
else if (lastColor == color && count < 64) // only allow up to 63 run-length (for SubtitleCreator compatibility)
{
count++;
}
else
{
WriteRle(ref indexHalfNibble, lastColor, count, ref index, buffer);
lastColor = color;
count = 1;
}
}
if (count > 0)
{
WriteRle(ref indexHalfNibble, lastColor, count, ref index, buffer);
}
if (indexHalfNibble)
{
index++;
}
if (y % 2 == 0)
{
indexBufferEqual = index;
bufferEqual = buffer;
}
else
{
indexBufferUnEqual = index;
bufferUnEqual = buffer;
}
}
var twoParts = new RunLengthTwoParts {
Buffer1 = new byte[indexBufferEqual]
};
Buffer.BlockCopy(bufferEqual, 0, twoParts.Buffer1, 0, indexBufferEqual);
twoParts.Buffer2 = new byte[indexBufferUnEqual + 2];
Buffer.BlockCopy(bufferUnEqual, 0, twoParts.Buffer2, 0, indexBufferUnEqual);
return(twoParts);
}
public RunLengthTwoParts RunLengthEncodeForDvd(Color background, Color pattern, Color emphasis1, Color emphasis2)
{
var backgroundBuffer = new byte[4];
backgroundBuffer[0] = background.B;
backgroundBuffer[1] = background.G;
backgroundBuffer[2] = background.R;
backgroundBuffer[3] = background.A;
var patternBuffer = new byte[4];
patternBuffer[0] = pattern.B;
patternBuffer[1] = pattern.G;
patternBuffer[2] = pattern.R;
patternBuffer[3] = pattern.A;
var emphasis1Buffer = new byte[4];
emphasis1Buffer[0] = emphasis1.B;
emphasis1Buffer[1] = emphasis1.G;
emphasis1Buffer[2] = emphasis1.R;
emphasis1Buffer[3] = emphasis1.A;
var emphasis2Buffer = new byte[4];
emphasis2Buffer[0] = emphasis2.B;
emphasis2Buffer[1] = emphasis2.G;
emphasis2Buffer[2] = emphasis2.R;
emphasis2Buffer[3] = emphasis2.A;
var bufferEqual = new byte[Width * Height];
var bufferUnEqual = new byte[Width * Height];
int indexBufferEqual = 0;
int indexBufferUnEqual = 0;
_pixelAddress = -4;
for (int y = 0; y < Height; y++)
{
int index;
byte[] buffer;
if (y % 2 == 0)
{
index = indexBufferEqual;
buffer = bufferEqual;
}
else
{
index = indexBufferUnEqual;
buffer = bufferUnEqual;
}
var indexHalfNibble = false;
var lastColor = -1;
var count = 0;
for (int x = 0; x < Width; x++)
{
int color = GetDvdColor(patternBuffer, emphasis1Buffer, emphasis2Buffer);
if (lastColor == -1)
{
lastColor = color;
count = 1;
}
else if (lastColor == color && count < 64) // only allow up to 63 run-length (for SubtitleCreator compatibility)
{
count++;
}
else
{
WriteRle(ref indexHalfNibble, lastColor, count, ref index, buffer);
lastColor = color;
count = 1;
}
}
if (count > 0)
WriteRle(ref indexHalfNibble, lastColor, count, ref index, buffer);
if (indexHalfNibble)
index++;
if (y % 2 == 0)
{
indexBufferEqual = index;
bufferEqual = buffer;
}
else
{
indexBufferUnEqual = index;
bufferUnEqual = buffer;
}
}
var twoParts = new RunLengthTwoParts { Buffer1 = new byte[indexBufferEqual] };
Buffer.BlockCopy(bufferEqual, 0, twoParts.Buffer1, 0, indexBufferEqual);
twoParts.Buffer2 = new byte[indexBufferUnEqual + 2];
Buffer.BlockCopy(bufferUnEqual, 0, twoParts.Buffer2, 0, indexBufferUnEqual);
return twoParts;
}
