Saving a 8bpp image to PGM

save_8bpp_image_as_PGM.cpp

#include <ostream>
#include <algorithm>

void save_8bpp_image_as_PGM(
    std::ostream& out,
    const uint8_t* image_data,
    size_t width,
    size_t height,
    size_t bytes_per_row
) {
    out << "P2\n" << width << " " << height << "\n255\n";

    for(size_t y(0); y < height; ++y, out << "\n")
        for(size_t x(0); x < width; ++x, out << " ")
            out << (int) image_data[y * bytes_per_row + x] << " ";
}