private ExqFloat SortByDir(ExqHistogramEntry pHist)
{
return(pHist.color.r * sortDir.r +
pHist.color.g * sortDir.g +
pHist.color.b * sortDir.b +
pHist.color.a * sortDir.a);
}
private void Sort(ref ExqHistogramEntry ppHist, SortFunction sortfunc)
{
ExqHistogramEntry pLow, pHigh, pCur, pNext;
int n = 0;
ExqFloat sum = 0;
for (pCur = ppHist; pCur != null; pCur = pCur.pNext)
{
n++;
sum += sortfunc(pCur);
}
if (n < 2)
{
return;
}
sum /= n;
pLow = pHigh = null;
for (pCur = ppHist; pCur != null; pCur = pNext)
{
pNext = pCur.pNext;
if (sortfunc(pCur) < sum)
{
pCur.pNext = pLow;
pLow = pCur;
}
else
{
pCur.pNext = pHigh;
pHigh = pCur;
}
}
if (pLow == null)
{
ppHist = pHigh;
return;
}
if (pHigh == null)
{
ppHist = pLow;
return;
}
Sort(ref pLow, sortfunc);
Sort(ref pHigh, sortfunc);
ppHist = pLow;
while (pLow.pNext != null)
{
pLow = pLow.pNext;
}
pLow.pNext = pHigh;
}
public void Feed(byte[] pData)
{
byte channelMask = (byte)(0xFF00 >> pExq.numBitsPerChannel);
int nPixels = pData.Length / 4;
for (int i = 0; i < nPixels; i++)
{
byte r = pData[i * 4 + 0], g = pData[i * 4 + 1],
b = pData[i * 4 + 2], a = pData[i * 4 + 3];
uint hash = MakeHash(ToRGBA(r, g, b, a));
ExqHistogramEntry pCur = pExq.pHash[hash];
while (pCur != null && (pCur.ored != r || pCur.ogreen != g || pCur.oblue != b || pCur.oalpha != a))
{
pCur = pCur.pNextInHash;
}
if (pCur != null)
{
pCur.num++;
}
else
{
pCur = new ExqHistogramEntry();
pCur.pNextInHash = pExq.pHash[hash];
pExq.pHash[hash] = pCur;
pCur.ored = r; pCur.ogreen = g; pCur.oblue = b; pCur.oalpha = a;
r &= channelMask; g &= channelMask; b &= channelMask;
pCur.color.r = r / 255.0f * SCALE_R;
pCur.color.g = g / 255.0f * SCALE_G;
pCur.color.b = b / 255.0f * SCALE_B;
pCur.color.a = a / 255.0f * SCALE_A;
if (pExq.transparency)
{
pCur.color.r *= pCur.color.a;
pCur.color.g *= pCur.color.a;
pCur.color.b *= pCur.color.a;
}
pCur.num = 1;
pCur.palIndex = -1;
pCur.ditherScale.r = pCur.ditherScale.g = pCur.ditherScale.b =
pCur.ditherScale.a = -1;
pCur.ditherIndex[0] = pCur.ditherIndex[1] = pCur.ditherIndex[2] =
pCur.ditherIndex[3] = -1;
}
}
}
private ExqFloat SortByAlpha(ExqHistogramEntry pHist)
{
return(pHist.color.a);
}
private ExqFloat SortByBlue(ExqHistogramEntry pHist)
{
return(pHist.color.b);
}
private ExqFloat SortByGreen(ExqHistogramEntry pHist)
{
return(pHist.color.g);
}
private ExqFloat SortByRed(ExqHistogramEntry pHist)
{
return(pHist.color.r);
}
