private static unsafe HeifStringEncoderParameter CreateStringParameter(SafeHeifEncoder encoder,
heif_encoder_parameter nativeParameter,
string name,
bool hasDefaultValue)
{
string defaultValue = string.Empty;
if (hasDefaultValue)
{
byte[] bytes = new byte[256];
fixed(byte *ptr = bytes)
{
// The error value is ignored because some encoders return an error
// when getting the value of a valid command.
_ = LibHeifNative.heif_encoder_get_parameter_string(encoder, name, ptr, bytes.Length);
}
int count = bytes.Length;
// Look for the NUL terminator at the end of the string.
for (int i = 0; i < bytes.Length; i++)
{
if (bytes[i] == 0)
{
count = i;
break;
}
}
defaultValue = System.Text.Encoding.ASCII.GetString(bytes, 0, count);
}
var error = LibHeifNative.heif_encoder_parameter_get_valid_string_values(nativeParameter, out var stringArray);
error.ThrowIfError();
var validItems = stringArray.ToReadOnlyCollection();
return(new HeifStringEncoderParameter(name, hasDefaultValue, defaultValue, validItems));
}
