ref: 523670be3c1cf6e0f118d45b1e1cefdaeedecada
dir: /sys/src/cmd/python/Demo/tix/bitmaps/underline.xbm/
#define underline_width 16
#define underline_height 16
static unsigned char underline_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x1c, 0x38, 0x1c,
0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x70, 0x0e,
0xf0, 0x0f, 0xe0, 0x07, 0x00, 0x00, 0xf8, 0x1f};