Method loadFromFile

src/SFML/Graphics/Image.cpp:229–316

///////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
bool Image::loadFromFile(const std::filesystem::path& filename)
{
#ifdef SFML_SYSTEM_ANDROID

    if (priv::getActivityStatesPtr() != nullptr)
    {
        priv::ResourceStream stream;
        if (!stream.open(filename))
            return false;
        return loadFromStream(stream);
    }

#endif

    // Set up the stb_image callbacks for the std::ifstream
    const auto readStdIfStream = [](void* user, char* data, int size)
    {
        auto& file = *static_cast<std::ifstream*>(user);
        file.read(data, size);
        return static_cast<int>(file.gcount());
    };
    const auto skipStdIfStream = [](void* user, int size)
    {
        auto& file = *static_cast<std::ifstream*>(user);
        if (!file.seekg(size, std::ios_base::cur))
            err() << "Failed to seek image loader std::ifstream" << std::endl;
    };
    const auto eofStdIfStream = [](void* user)
    {
        auto& file = *static_cast<std::ifstream*>(user);
        return static_cast<int>(file.eof());
    };
    const stbi_io_callbacks callbacks{readStdIfStream, skipStdIfStream, eofStdIfStream};

    // Open file
    std::ifstream file(filename, std::ios::binary);
    if (!file.is_open())
    {
        // Error, failed to open the file
        err() << "Failed to load image\n"
              << formatDebugPathInfo(filename) << "\nReason: " << std::strerror(errno) << std::endl;
        return false;
    }

    // Read a (possible) QOI magic number
    std::array<char, 4> qoiMagicNumber{};
    file.read(qoiMagicNumber.data(), static_cast<std::streamsize>(qoiMagicNumber.size()));

    // Seek back to the start of the file for reading
    file.seekg(0, std::ios::beg);

    // Read the QOI file if it's valid
    if (isQoiMagicNumber(std::string_view(qoiMagicNumber.data(), static_cast<size_t>(file.gcount()))))
    {
        // Get the size of the file
        file.seekg(0, std::ios::end);
        const auto streamSize = static_cast<std::streamsize>(file.tellg());
        file.seekg(0, std::ios::beg);