print_gfx.c

    ostringstream param;
    param << "\x4c\x1b\x47\x4c\x31\x2c\x30\x2c";
    param << string(3 - swidth.size(), '0') << swidth;
    param << ",";
    param << string(3 - sheight.size(), '0') << sheight;
    param << ";";
    string cmd = param.str();
    write(f, cmd.c_str(), cmd.size());

    vector<char> bytedata;
    bytedata.resize(width * height / 8);

    int c = 0;
    int p = 128;
    int i = 0;
    for (int y = 0; y < height; y++)
    {
        for (int x = 0; x < width; x++)
        {
            int n = pixeldata[y * width + x] ? 1 : 0;
            c += p * n;
            p /= 2;
            if (p == 0)
            {
                //dbprintf("%4d", c);
                bytedata[i++] = c;
                p = 128;
                c = 0;
            }
        }
        //dbprintf("\n");
    }

    write(f, (const char *)&bytedata[0], bytedata.size());
    close(f);