Method fill_image

utils/ImageLoader.h:174–244

     */
    template <typename T>
    void fill_image(T &image)
    {
        ARM_COMPUTE_ERROR_ON(!is_open());
        ARM_COMPUTE_ERROR_ON(image.info()->dimension(0) != _width || image.info()->dimension(1) != _height);
        ARM_COMPUTE_ERROR_ON_FORMAT_NOT_IN(&image, Format::U8, Format::RGB888);
        ARM_COMPUTE_ERROR_ON(_feeder.get() == nullptr);
        try
        {
            // Map buffer if creating a CLTensor
            map(image, true);

            // Validate feeding data
            validate_info(image.info());

            switch (image.info()->format())
            {
                case Format::U8:
                {
                    // We need to convert the data from RGB to grayscale:
                    // Iterate through every pixel of the image
                    Window window;
                    window.set(Window::DimX, Window::Dimension(0, _width, 1));
                    window.set(Window::DimY, Window::Dimension(0, _height, 1));

                    Iterator out(&image, window);

                    unsigned char red   = 0;
                    unsigned char green = 0;
                    unsigned char blue  = 0;

                    execute_window_loop(
                        window,
                        [&](const Coordinates &)
                        {
                            red   = _feeder->get();
                            green = _feeder->get();
                            blue  = _feeder->get();

                            *out.ptr() = 0.2126f * red + 0.7152f * green + 0.0722f * blue;
                        },
                        out);

                    break;
                }
                case Format::RGB888:
                {
                    // There is no format conversion needed: we can simply copy the content of the input file to the image one row at the time.
                    // Create a vertical window to iterate through the image's rows:
                    Window window;
                    window.set(Window::DimY, Window::Dimension(0, _height, 1));

                    Iterator out(&image, window);
                    size_t   row_size = _width * image.info()->element_size();

                    execute_window_loop(
                        window, [&](const Coordinates &) { _feeder->get_row(out.ptr(), row_size); }, out);

                    break;