/// <inheritdoc />
public byte[] Decode(IReadOnlyList <byte> input, DictionaryToken streamDictionary, int filterIndex)
{
var parameters = DecodeParameterResolver.GetFilterParameters(streamDictionary, filterIndex);
var predictor = parameters.GetIntOrDefault(NameToken.Predictor, -1);
var earlyChange = parameters.GetIntOrDefault(NameToken.EarlyChange, 1);
if (predictor > 1)
{
var decompressed = Decode(input, earlyChange == 1);
var colors = Math.Min(parameters.GetIntOrDefault(NameToken.Colors, DefaultColors), 32);
var bitsPerComponent = parameters.GetIntOrDefault(NameToken.BitsPerComponent, DefaultBitsPerComponent);
var columns = parameters.GetIntOrDefault(NameToken.Columns, DefaultColumns);
var result = PngPredictor.Decode(decompressed, predictor, colors, bitsPerComponent, columns);
return(result);
}
var data = Decode(input, earlyChange == 1);
return(data);
}
/// <inheritdoc />
public byte[] Decode(IReadOnlyList <byte> input, DictionaryToken streamDictionary, int filterIndex)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
var parameters = DecodeParameterResolver.GetFilterParameters(streamDictionary, filterIndex);
var predictor = parameters.GetIntOrDefault(NameToken.Predictor, -1);
var bytes = input.ToArray();
try
{
var decompressed = Decompress(bytes);
if (predictor == -1)
{
return(decompressed);
}
var colors = Math.Min(parameters.GetIntOrDefault(NameToken.Colors, DefaultColors), 32);
var bitsPerComponent = parameters.GetIntOrDefault(NameToken.BitsPerComponent, DefaultBitsPerComponent);
var columns = parameters.GetIntOrDefault(NameToken.Columns, DefaultColumns);
var result = PngPredictor.Decode(decompressed, predictor, colors, bitsPerComponent, columns);
return(result);
}
catch
{
// ignored.
}
return(bytes);
}