private static unsafe void GrayToRgb(ZsImage grayImage)
{
if (grayImage == null)
{
throw new ArgumentNullException();
}
grayImage.InsertComponents(new[] { 0.0, 0.0 }, 1);
const int NotDividableMinAmountElements = 80;
double[] pixelsData = grayImage.PixelsData;
int pointsAmount = grayImage.Width * grayImage.Height;
// Decide on how many partitions we should divade the processing
// of the elements.
var partsCount = pointsAmount > NotDividableMinAmountElements
? Environment.ProcessorCount
: 1;
var partSize = (int)(pointsAmount / partsCount);
Parallel.For(0, partsCount, partIndex =>
{
var firstPointIndex = partIndex * partSize;
var lastPointIndex = firstPointIndex + partSize - 1;
if (partIndex == partsCount - 1)
{
lastPointIndex = pointsAmount - 1;
}
if (lastPointIndex > pointsAmount)
{
lastPointIndex = pointsAmount - 1;
}
fixed(double *pixelsDataP = pixelsData)
{
for (int pointIndex = lastPointIndex; pointIndex >= firstPointIndex; pointIndex--)
{
// Step 1. Inverse Companding
int i = pointIndex * 3;
// components should be in the range [0.0 , 1.0]
double gray = *(pixelsDataP + i + 0);
//*(pixelsDataP + i + 0) = gray;
*(pixelsDataP + i + 1) = gray;
*(pixelsDataP + i + 2) = gray;
}
}
});
}
public static ZsImage FromRgbToArgb(this ZsImage rgbImage, Area2D opaqueArea)
{
return(rgbImage.InsertComponents(new[] { 0.0 }, 0)
.SetComponentsValues(opaqueArea, new[] { 1.0 }, 0));
}