public static byte[] Unpack(ImageInfo imgInfo, byte[] src, byte[] dst, bool scale)
{
if (imgInfo is null)
{
throw new ArgumentNullException(nameof(imgInfo));
}
if (src is null)
{
throw new ArgumentNullException(nameof(src));
}
var len1 = imgInfo.SamplesPerRow;
var len0 = imgInfo.SamplesPerRowPacked;
if (dst is null || dst.Length < len1)
{
dst = new byte[len1];
}
if (imgInfo.Packed)
{
ImageLine.UnpackInplaceByte(imgInfo, src, dst, scale);
}
else
{
Array.Copy(src, 0, dst, 0, len0);
}
return(dst);
}
private void DecodeLastReadRowToByte(byte[] buffer, int bytesRead)
{ // see http://www.libpng.org/pub/png/spec/1.2/PNG-DataRep.html
if (ImgInfo.BitDepth <= 8)
{
Array.Copy(rowb, 1, buffer, 0, bytesRead);
}
else
{ // 16 bitspc
for (int i = 0, j = 1; j < bytesRead; i++, j += 2)
{
buffer[i] = rowb[j]; // 16 bits in 1 byte: this discards the LSB!!!
}
}
if (ImgInfo.Packed && unpackedMode)
{
ImageLine.UnpackInplaceByte(ImgInfo, buffer, buffer, false);
}
}
