private unsafe PixColor GetPixel(Pix pix, int x, int y)
{
var pixDepth = pix.Depth;
var pixData = pix.GetData();
var pixLine = (uint *)pixData.Data + pixData.WordsPerLine * y;
uint pixValue;
if (pixDepth == 1)
{
pixValue = PixData.GetDataBit(pixLine, x);
}
else if (pixDepth == 4)
{
pixValue = PixData.GetDataQBit(pixLine, x);
}
else if (pixDepth == 8)
{
pixValue = PixData.GetDataByte(pixLine, x);
}
else if (pixDepth == 32)
{
pixValue = PixData.GetDataFourByte(pixLine, x);
}
else
{
throw new ArgumentException(String.Format("Bit depth of {0} is not supported.", pix.Depth), "pix");
}
if (pix.Colormap != null)
{
return(pix.Colormap[(int)pixValue]);
}
else
{
if (pixDepth == 32)
{
return(PixColor.FromRgba(pixValue));
}
else
{
byte grayscale = (byte)(pixValue * 255 / ((1 << 16) - 1));
return(new PixColor(grayscale, grayscale, grayscale));
}
}
}
private static unsafe void TransferData32(PixData pixData, BitmapData imgData, int alphaMask)
{
var imgFormat = imgData.PixelFormat;
var height = imgData.Height;
var width = imgData.Width;
for (int y = 0; y < height; y++)
{
byte *imgLine = (byte *)imgData.Scan0 + (y * imgData.Stride);
uint *pixLine = (uint *)pixData.Data + (y * pixData.WordsPerLine);
for (int x = 0; x < width; x++)
{
var pixVal = PixColor.FromRgba(pixLine[x]);
byte *pixelPtr = imgLine + (x << 2);
pixelPtr[0] = pixVal.Blue;
pixelPtr[1] = pixVal.Green;
pixelPtr[2] = pixVal.Red;
pixelPtr[3] = (byte)(alphaMask | pixVal.Alpha); // Allow user to include alpha or not
}
}
}