The plugin works well in paint.net, but I tried in my app and got InvalidFile

[sati32]

I tried this:

    HEIFInterface           heifInterface;

    if (heifInterface.isValid())
    {
        heif_context    *context;

        context = heifInterface.createContext();

        if (context)
        {
            IOCallbacks fileIO;
            Status      stat;

            _myFile = file;
            fileIO.GetPosition = MyGetPosition;
            fileIO.GetSize = MyGetSize;
            fileIO.Read = MyRead;
            fileIO.Seek = MySeek;
            fileIO.Write = MyWrite;

            stat = heifInterface.loadFileIntoContext(context, &fileIO);

but stat gives always an InvalidFile. Do you know why?

[0xC0000054]

My only guess is that you may need to seek to the beginning of the file before calling loadFileIntoContext.

[sati32]

Thank you for your help. But this is not the solution. My file callbacks are called GetPosition and returns 0, GetSize and Read (4 Bytes and gives the first 4 Bytes of the file). I will try to check the source of LibHeic.

[sati32]

OK, the problem was my Read-Callback function. It has to return "0" for no error, not the amount of bytes read, as expected.

[sati32]

Works fine now. May I ask if there is a way to get 16 bit per channel instead of 8? Is there a way to get data without alpha or is there a way to detect if alpha is present?

[0xC0000054]

You would have to modify the C++ wrapper code to add those features.

Paint.NET uses 8-bit RGBA as its native image format, so the C++ wrapper code used by this plugin only supports that format. There was no point in adding features to the wrapper that Paint.NET does not support.