Function writeDataCallback

libffmpegthumbnailer/pngwriter.cpp:101–107

}

void writeDataCallback(png_structp png_ptr, png_bytep data, png_size_t length)
{
    vector<uint8_t>& outputBuffer = *(reinterpret_cast<vector<uint8_t>*>(png_get_io_ptr(png_ptr)));
    int prevBufSize               = outputBuffer.size();
    outputBuffer.resize(outputBuffer.size() + length);
    memcpy(&outputBuffer[prevBufSize], data, length);
}

}