Code snippet for reading image using fd and decoding with our image decoder.

image-loader-jni.cc

// Read the image
std::unique_ptr<Image> image = nullptr;
{
    std::string image_buffer;
    image_buffer.resize(fd_length);
    int remaining_length = read(fd, &image_buffer[0], length);
    if (remaining_length != 0) {
        return env->NewStringUTF("Failed to read full image");
    }

    image = ImageFactory::FromString(image_buffer);
}