font render

using bmp_type = bitmap<rgb_pixel<16>>;
uint8_t* bmp_buf = (uint8_t*)malloc(bmp_type::sizeof_buffer(bsz));
if(bmp_buf==nullptr) {
    return (int)gfx_result::out_of_memory;
}
bmp_type bmp(bsz,bmp_buf);
draw::text(bmp,(srect16)bmp.bounds(),{0,0},buf,f,scale,sfg,sbg,false);
char n[64];
generate_array(ident,itoa(cp,n,16),bmp_buf,bmp.size_bytes(),handle);
free(bmp_buf);