public float LevelInterval(float _Gap)
{
fLevelInterval = (global::LevelInterval)_Gap;
switch (fLevelInterval)
{
case global::LevelInterval.Zero:
fLevelIntervalAttackValue = 0;
break;
case global::LevelInterval.One:
fLevelIntervalAttackValue = 1;
break;
case global::LevelInterval.Two:
fLevelIntervalAttackValue = 2;
break;
case global::LevelInterval.Three:
fLevelIntervalAttackValue = 4;
break;
case global::LevelInterval.Four:
fLevelIntervalAttackValue = 8;
break;
case global::LevelInterval.Five:
fLevelIntervalAttackValue = 16;
break;
case global::LevelInterval.Six:
fLevelIntervalAttackValue = 32;
break;
case global::LevelInterval.Seven:
fLevelIntervalAttackValue = 64;
break;
case global::LevelInterval.Nine:
fLevelIntervalAttackValue = 128;
break;
case global::LevelInterval.Ten:
fLevelIntervalAttackValue = 256;
break;
default:
fLevelIntervalAttackValue = 512;
break;
}
return(fLevelIntervalAttackValue);
}
public static unsafe void CalculateAverageDithering(byte *pBuffer, WriteableBitmap bitmap, params object[] otherParams)
{
int width = bitmap.PixelWidth;
int height = bitmap.PixelHeight;
List <List <LevelInterval> > levelIntervals = new List <List <LevelInterval> >();
// Set up intervals for each channel
for (int c = 0; c < 3; c++)
{
int K = (int)((int[])otherParams[0])[c];
List <LevelInterval> channelLevelIntervals = new List <LevelInterval>();
for (int i = 0; i < K - 1; i++)
{
channelLevelIntervals.Add(new LevelInterval(255 / (K - 1), i));
}
levelIntervals.Add(channelLevelIntervals);
}
// Sum channel values for each interval to calculate threshold
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
for (int i = 0; i < 3; i++) // For each color channel
{
int channelValue = pBuffer[4 * x + (y * bitmap.BackBufferStride) + i];
int intervalIndex = (int)Math.Floor((double)(channelValue / (levelIntervals[i][0].intervalLength + 1)));
levelIntervals[i][intervalIndex].AddPixelValueToInterval(channelValue);
}
}
}
// After last pixel, calculate threshold
foreach (var levelInterval in levelIntervals)
{
foreach (var channelLevelInterval in levelInterval)
{
channelLevelInterval.CalculateAverageThreshold();
}
}
// Set new values
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
for (int i = 0; i < 3; i++) // For each color channel
{
int channelValue = pBuffer[4 * x + (y * bitmap.BackBufferStride) + i];
int intervalIndex = (int)Math.Floor((double)(channelValue / (levelIntervals[i][0].intervalLength + 1)));
LevelInterval interval = levelIntervals[i][intervalIndex];
if (channelValue < interval.threshold)
{
pBuffer[4 * x + (y * bitmap.BackBufferStride) + i] = (byte)interval.intervalStart;
}
else
{
pBuffer[4 * x + (y * bitmap.BackBufferStride) + i] = (byte)interval.intervalEnd;
}
}
}
}
}
