public void CombineData(byte[] prevData, int prevWidth, int prevHeight)
{
var dataX = Rect.MinX;
var dataY = Rect.MinY;
var dataWidth = Rect.SizeX;
var dataHeight = Rect.SizeY;
if (Data != null && Data.Length >= dataWidth * dataHeight && prevData != null && prevData.Length >= prevWidth * prevHeight)
{
for (var y = 0; y < dataHeight; y++)
{
for (var x = 0; x < dataWidth; x++)
{
var prevX = x + dataX;
var prevY = y + dataY;
var dataI = x + y * dataWidth;
if (prevX >= 0 && prevY >= 0 && prevX < prevWidth && prevY < prevHeight)
{
var prevI = prevX + prevY * prevWidth;
var dataA = D2dHelper.ConvertAlpha(Data[dataI]);
var prevA = D2dHelper.ConvertAlpha(prevData[prevI]);
Data[dataI] = D2dHelper.ConvertAlpha(dataA * prevA);
}
else
{
Data[dataI] = 0;
}
}
}
}
}