private void ValidateHeader()
{
if (!_colorTypes.ContainsKey(_header.ColorType))
{
throw new ImageFormatException("Color type is not supported or not valid.");
}
//if (!_colorTypes[_header.ColorType].SupportedBitDepths.Contains(_header.BitDepth))
if (!IEnum.Contains(_colorTypes[_header.ColorType].SupportedBitDepths, _header.BitDepth))
{
throw new ImageFormatException("Bit depth is not supported or not valid.");
}
if (_header.FilterMethod != 0)
{
throw new ImageFormatException("The png specification only defines 0 as filter method.");
}
if (_header.InterlaceMethod != 0)
{
throw new ImageFormatException("Interlacing is not supported.");
}
}