protected override void OnBeginRender (ISurface src, ISurface dst, Rectangle roi)
{
var histogram = new HistogramRgb ();
histogram.UpdateHistogram (src, src.Bounds);
op = histogram.MakeLevelsAuto ();
}
public object Clone()
{
LevelOp copy = new LevelOp(colorInLow, colorInHigh, (float[])gamma.Clone(), colorOutLow, colorOutHigh);
copy.CurveB = (byte[])this.CurveB.Clone();
copy.CurveG = (byte[])this.CurveG.Clone();
copy.CurveR = (byte[])this.CurveR.Clone();
return(copy);
}
public void SetFromLeveledHistogram (HistogramRgb inputHistogram, LevelOp upo)
{
if (inputHistogram == null || upo == null) {
return;
}
Clear ();
float[] before = new float[3];
float[] slopes = new float[3];
for (int c = 0; c < 3; c++) {
long[] channelHistogramOutput = histogram[c];
long[] channelHistogramInput = inputHistogram.histogram[c];
for (int v = 0; v <= 255; v++) {
ColorBgra after = ColorBgra.FromBgr ((byte)v, (byte)v, (byte)v);
upo.UnApply (after, before, slopes);
if (after[c] > upo.ColorOutHigh[c]
|| after[c] < upo.ColorOutLow[c]
|| (int)Math.Floor (before[c]) < 0
|| (int)Math.Ceiling (before[c]) > 255
|| float.IsNaN (before[c])) {
channelHistogramOutput[v] = 0;
} else if (before[c] <= upo.ColorInLow[c]) {
channelHistogramOutput[v] = 0;
for (int i = 0; i <= upo.ColorInLow[c]; i++) {
channelHistogramOutput[v] += channelHistogramInput[i];
}
} else if (before[c] >= upo.ColorInHigh[c]) {
channelHistogramOutput[v] = 0;
for (int i = upo.ColorInHigh[c]; i < 256; i++) {
channelHistogramOutput[v] += channelHistogramInput[i];
}
} else {
channelHistogramOutput[v] = (int)(slopes[c] * Utility.Lerp (
channelHistogramInput[(int)Math.Floor (before[c])],
channelHistogramInput[(int)Math.Ceiling (before[c])],
before[c] - Math.Floor (before[c])));
}
}
}
OnHistogramUpdated ();
}
public object Clone ()
{
LevelOp copy = new LevelOp (colorInLow, colorInHigh, (float[])gamma.Clone (), colorOutLow, colorOutHigh);
copy.CurveB = (byte[])this.CurveB.Clone ();
copy.CurveG = (byte[])this.CurveG.Clone ();
copy.CurveR = (byte[])this.CurveR.Clone ();
return copy;
}