public static void Convert(PngHeader header, byte[] inData, byte[] outData)
{
int stride = header.Stride;
PngFilter decoder = new PngFilter(stride,header.BytesPerPixel);
int inOfs=1;
int outOfs= 0;
for(int row = 0; row < header.Height; row++)
{
decoder.Decode(inData,outData,inOfs,outOfs);
inOfs += stride+1;
outOfs += stride;
}
}
public static void WriteRows(byte[] data, PngHeader header, Stream stream)
{
int stride=header.Stride;
if(header.IsMonochrome)
{
int ofs = 0;
for(int row=0; row < header.Height; row++)
{
stream.WriteByte((byte)Filter.None);
stream.Write(data,ofs,stride);
ofs+=stride;
};
}
else
{
var lines=new Dictionary<Filter, byte[]>();
foreach(Filter filter in Enum.GetValues(typeof(Filter)))
lines.Add(filter,new byte[stride]);
PngFilter encoder = new PngFilter(stride,header.BytesPerPixel);
int ofs = 0;
for(int row=0; row < header.Height; row++)
{
Filter filter = encoder.Encode(data,ofs,lines);
stream.WriteByte((byte)filter);
stream.Write(lines[filter],0,stride);
ofs+=stride;
};
}
}
