#include <stdint.h>
#include <stddef.h>

#include "../term.h"
#include "framebuffer.h"

void *memset(void *, int, size_t);
void *memcpy(void *, const void *, size_t);

// Builtin font originally taken from:
// https://github.com/viler-int10h/vga-text-mode-fonts/raw/master/FONTS/PC-OTHER/TOSH-SAT.F16
static const uint8_t builtin_font[] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x42, 0x81, 0x81, 0xa5, 0xa5, 0x81,
  0x81, 0xa5, 0x99, 0x81, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x3c, 0x7e, 0xff,
  0xff, 0xdb, 0xdb, 0xff, 0xff, 0xdb, 0xe7, 0xff, 0x7e, 0x3c, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0x7c, 0x7c, 0x38, 0x38, 0x10,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe,
  0x7c, 0x7c, 0x38, 0x38, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
  0x3c, 0x3c, 0xdb, 0xff, 0xff, 0xdb, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0xff, 0x66, 0x18, 0x18,
  0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x78,
  0x78, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0x84, 0x84, 0xcc, 0x78, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd,
  0xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x1e,
  0x0e, 0x1e, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x78, 0xcc, 0xcc, 0xcc, 0x78, 0x30, 0xfc, 0x30, 0x30,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x18, 0x1c, 0x1e, 0x16, 0x12,
  0x10, 0x10, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x30, 0x38, 0x2c,
  0x26, 0x32, 0x3a, 0x2e, 0x26, 0x22, 0x62, 0xe2, 0xc6, 0x0e, 0x0c, 0x00,
  0x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf8, 0xfe,
  0xf8, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
  0x06, 0x0e, 0x3e, 0xfe, 0x3e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x30, 0x78, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0xfc, 0x78,
  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc,
  0xcc, 0xcc, 0x00, 0xcc, 0xcc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xdb,
  0xdb, 0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0x60, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x0c,
  0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xfe, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x78,
  0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0xfc, 0x78, 0x30, 0xfc, 0x00, 0x00,
  0x00, 0x00, 0x30, 0x78, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
  0x30, 0x30, 0xfc, 0x78, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x18, 0x0c, 0xfe, 0xfe, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x60, 0xfe, 0xfe, 0x60, 0x30, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0,
  0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x24, 0x66, 0xff, 0xff, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe, 0xfe,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe, 0x7c, 0x7c,
  0x38, 0x38, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x30, 0x78, 0x78, 0x78, 0x78, 0x30, 0x30, 0x30, 0x00, 0x30,
  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x6c,
  0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00,
  0x00, 0x18, 0x18, 0x7c, 0xc6, 0xc0, 0xc0, 0x7c, 0x06, 0x06, 0xc6, 0x7c,
  0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0x0c, 0x0c, 0x18, 0x38,
  0x30, 0x60, 0x60, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
  0x6c, 0x38, 0x30, 0x76, 0xde, 0xcc, 0xcc, 0xde, 0x76, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0x60, 0x60, 0x60,
  0x60, 0x60, 0x60, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30,
  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x38, 0xfe, 0x38, 0x6c, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e,
  0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x06,
  0x0c, 0x0c, 0x18, 0x38, 0x30, 0x60, 0x60, 0xc0, 0xc0, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0xc6,
  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18,
  0x18, 0x18, 0x18, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
  0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0x06, 0xc6,
  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x0c, 0x1c, 0x3c, 0x6c, 0xcc,
  0xfe, 0x0c, 0x0c, 0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0,
  0xc0, 0xc0, 0xfc, 0x06, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x3c, 0x60, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18,
  0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
  0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x0c,
  0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
  0x18, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00,
  0x00, 0x00, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x60, 0x30, 0x18, 0x0c,
  0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00,
  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x60,
  0x30, 0x18, 0x0c, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x00, 0x30,
  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xde, 0xde,
  0xde, 0xde, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
  0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
  0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0,
  0xc0, 0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xcc,
  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0,
  0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
  0xc0, 0xc0, 0xc0, 0xde, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6,
  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30,
  0x30, 0x30, 0x30, 0x30, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x0c,
  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xc6, 0xc6, 0xcc, 0xd8, 0xf0, 0xe0, 0xf0, 0xd8, 0xcc, 0xc6,
  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
  0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
  0xee, 0xfe, 0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xc6, 0xc6, 0xe6, 0xe6, 0xf6, 0xde, 0xce, 0xce, 0xc6, 0xc6,
  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
  0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6,
  0xc6, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xf6, 0xda,
  0x6c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc,
  0xd8, 0xcc, 0xcc, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
  0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xff, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
  0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
  0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x10, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xd6, 0xfe, 0x6c,
  0x6c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x38,
  0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc,
  0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xfe, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc0, 0xc0,
  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x60, 0x60, 0x60, 0x60, 0x60,
  0x60, 0x60, 0x60, 0x60, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0,
  0x60, 0x60, 0x30, 0x38, 0x18, 0x0c, 0x0c, 0x06, 0x06, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
  0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
  0x00, 0x00, 0x18, 0x18, 0x18, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0x06, 0x06,
  0x7e, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0,
  0xc0, 0xdc, 0xe6, 0xc6, 0xc6, 0xc6, 0xc6, 0xe6, 0xdc, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0, 0xc6,
  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x06, 0x06, 0x76, 0xce, 0xc6,
  0xc6, 0xc6, 0xc6, 0xce, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x7c, 0xc6, 0xc6, 0xfe, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x1c, 0x36, 0x30, 0x30, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30,
  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xce, 0xc6,
  0xc6, 0xc6, 0xce, 0x76, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0xc0, 0xc0,
  0xc0, 0xdc, 0xe6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x18, 0x00, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
  0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x1e, 0x06, 0x06,
  0x06, 0x06, 0x06, 0x06, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0xc0, 0xc0,
  0xc0, 0xc6, 0xcc, 0xd8, 0xf0, 0xf0, 0xd8, 0xcc, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
  0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xec, 0xfe, 0xd6,
  0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0xdc, 0xe6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xdc, 0xe6, 0xc6,
  0xc6, 0xc6, 0xe6, 0xdc, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x76, 0xce, 0xc6, 0xc6, 0xc6, 0xce, 0x76, 0x06, 0x06, 0x06, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0xdc, 0xe6, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
  0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc0,
  0x70, 0x1c, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30,
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  0xcc, 0x78, 0x30, 0x30, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
  0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x6c, 0x6c,
  0xee, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0x60, 0x30, 0x78, 0xcc,
  0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x76, 0xbb, 0x99, 0x99, 0xdd, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x02, 0x06, 0x3c, 0x6c, 0xce, 0xd6, 0xd6, 0xe6, 0x6c, 0x78,
  0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x30, 0x60, 0xc0, 0xc0, 0xfe,
  0xc0, 0xc0, 0x60, 0x30, 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0xfc,
  0x30, 0x30, 0x00, 0x00, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x60, 0x30, 0x18, 0x0c, 0x18, 0x30, 0x60, 0x00, 0xfc, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0xc0, 0x60, 0x30, 0x18, 0x00,
  0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c, 0x36, 0x36, 0x30, 0x30, 0x30,
  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x18, 0x18, 0x18,
  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xd8, 0xd8, 0x70, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0xfc, 0x00, 0x30, 0x30, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00,
  0x76, 0xdc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0xcc,
  0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x0c, 0x0c,
  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0x6c, 0x3c, 0x1c, 0x0c, 0x00, 0x00,
  0x00, 0xd8, 0xec, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c, 0x0c, 0x18, 0x30, 0x60, 0x7c,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00
};

static void fbterm_save_state(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;
    ctx->saved_state_text_fg = ctx->text_fg;
    ctx->saved_state_text_bg = ctx->text_bg;
    ctx->saved_state_cursor_x = ctx->cursor_x;
    ctx->saved_state_cursor_y = ctx->cursor_y;
}

static void fbterm_restore_state(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;
    ctx->text_fg = ctx->saved_state_text_fg;
    ctx->text_bg = ctx->saved_state_text_bg;
    ctx->cursor_x = ctx->saved_state_cursor_x;
    ctx->cursor_y = ctx->saved_state_cursor_y;
}

static void fbterm_swap_palette(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;
    uint32_t tmp = ctx->text_bg;
    ctx->text_bg = ctx->text_fg;
    ctx->text_fg = tmp;
}

static void plot_char(struct term_context *_ctx, struct fbterm_char *c, size_t x, size_t y) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (x >= _ctx->cols || y >= _ctx->rows) {
        return;
    }

    x = ctx->offset_x + x * ctx->glyph_width;
    y = ctx->offset_y + y * ctx->glyph_height;

    bool *glyph = &ctx->font_bool[c->c * ctx->font_height * ctx->font_width];
    // naming: fx,fy for font coordinates, gx,gy for glyph coordinates
    for (size_t gy = 0; gy < ctx->glyph_height; gy++) {
        uint8_t fy = gy / ctx->font_scale_y;
        volatile uint32_t *fb_line = ctx->framebuffer + x + (y + gy) * (ctx->pitch / 4);
        uint32_t *canvas_line = ctx->canvas + x + (y + gy) * ctx->width;
        for (size_t fx = 0; fx < ctx->font_width; fx++) {
            bool draw = glyph[fy * ctx->font_width + fx];
            for (size_t i = 0; i < ctx->font_scale_x; i++) {
                size_t gx = ctx->font_scale_x * fx + i;
                uint32_t bg = c->bg == 0xffffffff ? canvas_line[gx] : c->bg;
                uint32_t fg = c->fg == 0xffffffff ? canvas_line[gx] : c->fg;
                fb_line[gx] = draw ? fg : bg;
            }
        }
    }
}

static void plot_char_fast(struct term_context *_ctx, struct fbterm_char *old, struct fbterm_char *c, size_t x, size_t y) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (x >= _ctx->cols || y >= _ctx->rows) {
        return;
    }

    x = ctx->offset_x + x * ctx->glyph_width;
    y = ctx->offset_y + y * ctx->glyph_height;

    bool *new_glyph = &ctx->font_bool[c->c * ctx->font_height * ctx->font_width];
    bool *old_glyph = &ctx->font_bool[old->c * ctx->font_height * ctx->font_width];
    for (size_t gy = 0; gy < ctx->glyph_height; gy++) {
        uint8_t fy = gy / ctx->font_scale_y;
        volatile uint32_t *fb_line = ctx->framebuffer + x + (y + gy) * (ctx->pitch / 4);
        uint32_t *canvas_line = ctx->canvas + x + (y + gy) * ctx->width;
        for (size_t fx = 0; fx < ctx->font_width; fx++) {
            bool old_draw = old_glyph[fy * ctx->font_width + fx];
            bool new_draw = new_glyph[fy * ctx->font_width + fx];
            if (old_draw == new_draw)
                continue;
            for (size_t i = 0; i < ctx->font_scale_x; i++) {
                size_t gx = ctx->font_scale_x * fx + i;
                uint32_t bg = c->bg == 0xffffffff ? canvas_line[gx] : c->bg;
                uint32_t fg = c->fg == 0xffffffff ? canvas_line[gx] : c->fg;
                fb_line[gx] = new_draw ? fg : bg;
            }
        }
    }
}

static inline bool compare_char(struct fbterm_char *a, struct fbterm_char *b) {
    return !(a->c != b->c || a->bg != b->bg || a->fg != b->fg);
}

static void push_to_queue(struct term_context *_ctx, struct fbterm_char *c, size_t x, size_t y) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (x >= _ctx->cols || y >= _ctx->rows) {
        return;
    }

    size_t i = y * _ctx->cols + x;

    struct fbterm_queue_item *q = ctx->map[i];

    if (q == NULL) {
        if (compare_char(&ctx->grid[i], c)) {
            return;
        }
        q = &ctx->queue[ctx->queue_i++];
        q->x = x;
        q->y = y;
        ctx->map[i] = q;
    }

    q->c = *c;
}

static void fbterm_revscroll(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    for (size_t i = (_ctx->scroll_bottom_margin - 1) * _ctx->cols - 1; ; i--) {
        struct fbterm_char *c;
        struct fbterm_queue_item *q = ctx->map[i];
        if (q != NULL) {
            c = &q->c;
        } else {
            c = &ctx->grid[i];
        }
        push_to_queue(_ctx, c, (i + _ctx->cols) % _ctx->cols, (i + _ctx->cols) / _ctx->cols);
        if (i == _ctx->scroll_top_margin * _ctx->cols) {
            break;
        }
    }

    // Clear the first line of the screen.
    struct fbterm_char empty;
    empty.c  = ' ';
    empty.fg = ctx->text_fg;
    empty.bg = ctx->text_bg;
    for (size_t i = _ctx->scroll_top_margin * _ctx->cols;
         i < (_ctx->scroll_top_margin + 1) * _ctx->cols; i++) {
        push_to_queue(_ctx, &empty, i % _ctx->cols, i / _ctx->cols);
    }
}

static void fbterm_scroll(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    for (size_t i = (_ctx->scroll_top_margin + 1) * _ctx->cols;
         i < _ctx->scroll_bottom_margin * _ctx->cols; i++) {
        struct fbterm_char *c;
        struct fbterm_queue_item *q = ctx->map[i];
        if (q != NULL) {
            c = &q->c;
        } else {
            c = &ctx->grid[i];
        }
        push_to_queue(_ctx, c, (i - _ctx->cols) % _ctx->cols, (i - _ctx->cols) / _ctx->cols);
    }

    // Clear the last line of the screen.
    struct fbterm_char empty;
    empty.c  = ' ';
    empty.fg = ctx->text_fg;
    empty.bg = ctx->text_bg;
    for (size_t i = (_ctx->scroll_bottom_margin - 1) * _ctx->cols;
         i < _ctx->scroll_bottom_margin * _ctx->cols; i++) {
        push_to_queue(_ctx, &empty, i % _ctx->cols, i / _ctx->cols);
    }
}

static void fbterm_clear(struct term_context *_ctx, bool move) {
    struct fbterm_context *ctx = (void *)_ctx;

    struct fbterm_char empty;
    empty.c  = ' ';
    empty.fg = ctx->text_fg;
    empty.bg = ctx->text_bg;
    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
        push_to_queue(_ctx, &empty, i % _ctx->cols, i / _ctx->cols);
    }

    if (move) {
        ctx->cursor_x = 0;
        ctx->cursor_y = 0;
    }
}

static void fbterm_enable_cursor(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->cursor_status = true;
}

static bool fbterm_disable_cursor(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    bool ret = ctx->cursor_status;
    ctx->cursor_status = false;
    return ret;
}

static void fbterm_set_cursor_pos(struct term_context *_ctx, size_t x, size_t y) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (x >= _ctx->cols) {
        if ((int)x < 0) {
            x = 0;
        } else {
            x = _ctx->cols - 1;
        }
    }
    if (y >= _ctx->rows) {
        if ((int)y < 0) {
            y = 0;
        } else {
            y = _ctx->rows - 1;
        }
    }
    ctx->cursor_x = x;
    ctx->cursor_y = y;
}

static void fbterm_get_cursor_pos(struct term_context *_ctx, size_t *x, size_t *y) {
    struct fbterm_context *ctx = (void *)_ctx;

    *x = ctx->cursor_x;
    *y = ctx->cursor_y;
}

static void fbterm_move_character(struct term_context *_ctx, size_t new_x, size_t new_y, size_t old_x, size_t old_y) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (old_x >= _ctx->cols || old_y >= _ctx->rows
     || new_x >= _ctx->cols || new_y >= _ctx->rows) {
        return;
    }

    size_t i = old_x + old_y * _ctx->cols;

    struct fbterm_char *c;
    struct fbterm_queue_item *q = ctx->map[i];
    if (q != NULL) {
        c = &q->c;
    } else {
        c = &ctx->grid[i];
    }

    push_to_queue(_ctx, c, new_x, new_y);
}

static void fbterm_set_text_fg(struct term_context *_ctx, size_t fg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_fg = ctx->ansi_colours[fg];
}

static void fbterm_set_text_bg(struct term_context *_ctx, size_t bg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_bg = ctx->ansi_colours[bg];
}

static void fbterm_set_text_fg_bright(struct term_context *_ctx, size_t fg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_fg = ctx->ansi_bright_colours[fg];
}

static void fbterm_set_text_bg_bright(struct term_context *_ctx, size_t bg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_bg = ctx->ansi_bright_colours[bg];
}

static void fbterm_set_text_fg_rgb(struct term_context *_ctx, uint32_t fg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_fg = fg;
}

static void fbterm_set_text_bg_rgb(struct term_context *_ctx, uint32_t bg) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_bg = bg;
}

static void fbterm_set_text_fg_default(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_fg = ctx->default_fg;
}

static void fbterm_set_text_bg_default(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    ctx->text_bg = 0xffffffff;
}

static void draw_cursor(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    size_t i = ctx->cursor_x + ctx->cursor_y * _ctx->cols;
    struct fbterm_char c;
    struct fbterm_queue_item *q = ctx->map[i];
    if (q != NULL) {
        c = q->c;
    } else {
        c = ctx->grid[i];
    }
    uint32_t tmp = c.fg;
    c.fg = c.bg;
    c.bg = tmp;
    plot_char(_ctx, &c, ctx->cursor_x, ctx->cursor_y);
    if (q != NULL) {
        ctx->grid[i] = q->c;
        ctx->map[i] = NULL;
    }
}

static void fbterm_double_buffer_flush(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    if (ctx->cursor_status) {
        draw_cursor(_ctx);
    }

    for (size_t i = 0; i < ctx->queue_i; i++) {
        struct fbterm_queue_item *q = &ctx->queue[i];
        size_t offset = q->y * _ctx->cols + q->x;
        if (ctx->map[offset] == NULL) {
            continue;
        }
        struct fbterm_char *old = &ctx->grid[offset];
        if (q->c.bg == old->bg && q->c.fg == old->fg) {
            plot_char_fast(_ctx, old, &q->c, q->x, q->y);
        } else {
            plot_char(_ctx, &q->c, q->x, q->y);
        }
        ctx->grid[offset] = q->c;
        ctx->map[offset] = NULL;
    }

    if ((ctx->old_cursor_x != ctx->cursor_x || ctx->old_cursor_y != ctx->cursor_y) || ctx->cursor_status == false) {
        plot_char(_ctx, &ctx->grid[ctx->old_cursor_x + ctx->old_cursor_y * _ctx->cols], ctx->old_cursor_x, ctx->old_cursor_y);
    }

    ctx->old_cursor_x = ctx->cursor_x;
    ctx->old_cursor_y = ctx->cursor_y;

    ctx->queue_i = 0;
}

static void fbterm_raw_putchar(struct term_context *_ctx, uint8_t c) {
    struct fbterm_context *ctx = (void *)_ctx;

    struct fbterm_char ch;
    ch.c  = c;
    ch.fg = ctx->text_fg;
    ch.bg = ctx->text_bg;
    push_to_queue(_ctx, &ch, ctx->cursor_x++, ctx->cursor_y);
    if (ctx->cursor_x == _ctx->cols && (ctx->cursor_y < _ctx->scroll_bottom_margin - 1 || _ctx->scroll_enabled)) {
        ctx->cursor_x = 0;
        ctx->cursor_y++;
    }
    if (ctx->cursor_y == _ctx->scroll_bottom_margin) {
        ctx->cursor_y--;
        fbterm_scroll(_ctx);
    }
}

static void fbterm_full_refresh(struct term_context *_ctx) {
    struct fbterm_context *ctx = (void *)_ctx;

    for (size_t y = 0; y < ctx->height; y++) {
        for (size_t x = 0; x < ctx->width; x++) {
            ctx->framebuffer[y * (ctx->pitch / sizeof(uint32_t)) + x] = ctx->canvas[y * ctx->width + x];
        }
    }

    for (size_t i = 0; i < (size_t)_ctx->rows * _ctx->cols; i++) {
        size_t x = i % _ctx->cols;
        size_t y = i / _ctx->cols;

        plot_char(_ctx, &ctx->grid[i], x, y);
    }

    if (ctx->cursor_status) {
        draw_cursor(_ctx);
    }
}

static void fbterm_deinit(struct term_context *_ctx, void (*_free)(void *, size_t)) {
    struct fbterm_context *ctx = (void *)_ctx;

    _free(ctx->font_bits, ctx->font_bits_size);
    _free(ctx->font_bool, ctx->font_bool_size);
    _free(ctx->grid, ctx->grid_size);
    _free(ctx->queue, ctx->queue_size);
    _free(ctx->map, ctx->map_size);
    _free(ctx->canvas, ctx->canvas_size);
    _free(ctx, sizeof(struct fbterm_context));
}

struct term_context *fbterm_init(
    void *(*_malloc)(size_t),
    uint32_t *framebuffer, size_t width, size_t height, size_t pitch,
    uint32_t *canvas,
    uint32_t *ansi_colours, uint32_t *ansi_bright_colours,
    uint32_t *default_bg, uint32_t *default_fg,
    void *font, size_t font_width, size_t font_height, size_t font_spacing,
    size_t font_scale_x, size_t font_scale_y,
    size_t margin
) {
    struct fbterm_context *ctx = _malloc(sizeof(struct fbterm_context));

    struct term_context *_ctx = (void *)ctx;

    memset(ctx, 0, sizeof(struct fbterm_context));

    ctx->cursor_status = true;

    if (ansi_colours != NULL) {
        memcpy(ctx->ansi_colours, ansi_colours, sizeof(ctx->ansi_colours));
    } else {
        ctx->ansi_colours[0] = 0x00000000; // black
        ctx->ansi_colours[1] = 0x00aa0000; // red
        ctx->ansi_colours[2] = 0x0000aa00; // green
        ctx->ansi_colours[3] = 0x00aa5500; // brown
        ctx->ansi_colours[4] = 0x000000aa; // blue
        ctx->ansi_colours[5] = 0x00aa00aa; // magenta
        ctx->ansi_colours[6] = 0x0000aaaa; // cyan
        ctx->ansi_colours[7] = 0x00aaaaaa; // grey
    }

    if (ansi_bright_colours != NULL) {
        memcpy(ctx->ansi_bright_colours, ansi_bright_colours, sizeof(ctx->ansi_bright_colours));
    } else {
        ctx->ansi_bright_colours[0] = 0x00555555; // black
        ctx->ansi_bright_colours[1] = 0x00ff5555; // red
        ctx->ansi_bright_colours[2] = 0x0055ff55; // green
        ctx->ansi_bright_colours[3] = 0x00ffff55; // brown
        ctx->ansi_bright_colours[4] = 0x005555ff; // blue
        ctx->ansi_bright_colours[5] = 0x00ff55ff; // magenta
        ctx->ansi_bright_colours[6] = 0x0055ffff; // cyan
        ctx->ansi_bright_colours[7] = 0x00ffffff; // grey
    }

    if (default_bg != NULL) {
        ctx->default_bg = *default_bg;
    } else {
        ctx->default_bg = 0x00000000; // background (black)
    }

    if (default_fg != NULL) {
        ctx->default_fg = *default_fg;
    } else {
        ctx->default_fg = 0x00aaaaaa; // foreground (grey)
    }

    ctx->text_fg = ctx->default_fg;
    ctx->text_bg = 0xffffffff;

    ctx->framebuffer = (void *)framebuffer;
    ctx->width = width;
    ctx->height = height;
    ctx->pitch = pitch;

#define FONT_BYTES ((font_width * font_height * FBTERM_FONT_GLYPHS) / 8)

    if (font != NULL) {
        ctx->font_width = font_width;
        ctx->font_height = font_height;
        ctx->font_bits = _malloc(FONT_BYTES);
        memcpy(ctx->font_bits, font, FONT_BYTES);
    } else {
        ctx->font_width = font_width = 8;
        ctx->font_height = font_height = 16;
        font_spacing = 1;
        ctx->font_bits = _malloc(FONT_BYTES);
        memcpy(ctx->font_bits, builtin_font, FONT_BYTES);
    }

    ctx->font_bits_size = FONT_BYTES;

#undef FONT_BYTES

    ctx->font_width += font_spacing;

    ctx->font_bool_size = FBTERM_FONT_GLYPHS * font_height * ctx->font_width * sizeof(bool);
    ctx->font_bool = _malloc(ctx->font_bool_size);

    for (size_t i = 0; i < FBTERM_FONT_GLYPHS; i++) {
        uint8_t *glyph = &ctx->font_bits[i * font_height];

        for (size_t y = 0; y < font_height; y++) {
            // NOTE: the characters in VGA fonts are always one byte wide.
            // 9 dot wide fonts have 8 dots and one empty column, except
            // characters 0xC0-0xDF replicate column 9.
            for (size_t x = 0; x < 8; x++) {
                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;

                if ((glyph[y] & (0x80 >> x))) {
                    ctx->font_bool[offset] = true;
                } else {
                    ctx->font_bool[offset] = false;
                }
            }
            // fill columns above 8 like VGA Line Graphics Mode does
            for (size_t x = 8; x < ctx->font_width; x++) {
                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;

                if (i >= 0xc0 && i <= 0xdf) {
                    ctx->font_bool[offset] = (glyph[y] & 1);
                } else {
                    ctx->font_bool[offset] = false;
                }
            }
        }
    }

    ctx->font_scale_x = font_scale_x;
    ctx->font_scale_y = font_scale_y;

    ctx->glyph_width = ctx->font_width * font_scale_x;
    ctx->glyph_height = font_height * font_scale_y;

    _ctx->cols = (ctx->width - margin * 2) / ctx->glyph_width;
    _ctx->rows = (ctx->height - margin * 2) / ctx->glyph_height;

    ctx->offset_x = margin + ((ctx->width - margin * 2) % ctx->glyph_width) / 2;
    ctx->offset_y = margin + ((ctx->height - margin * 2) % ctx->glyph_height) / 2;

    ctx->grid_size = _ctx->rows * _ctx->cols * sizeof(struct fbterm_char);
    ctx->grid = _malloc(ctx->grid_size);
    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
        ctx->grid[i].c = ' ';
        ctx->grid[i].fg = ctx->text_fg;
        ctx->grid[i].bg = ctx->text_bg;
    }

    ctx->queue_size = _ctx->rows * _ctx->cols * sizeof(struct fbterm_queue_item);
    ctx->queue = _malloc(ctx->queue_size);
    ctx->queue_i = 0;
    memset(ctx->queue, 0, ctx->queue_size);

    ctx->map_size = _ctx->rows * _ctx->cols * sizeof(struct fbterm_queue_item *);
    ctx->map = _malloc(ctx->map_size);
    memset(ctx->map, 0, ctx->map_size);

    ctx->canvas_size = ctx->width * ctx->height * sizeof(uint32_t);
    ctx->canvas = _malloc(ctx->canvas_size);
    if (canvas != NULL) {
        memcpy(ctx->canvas, canvas, ctx->canvas_size);
    } else {
        for (size_t i = 0; i < ctx->width * ctx->height; i++) {
            ctx->canvas[i] = ctx->default_bg;
        }
    }

    _ctx->raw_putchar = fbterm_raw_putchar;
    _ctx->clear = fbterm_clear;
    _ctx->enable_cursor = fbterm_enable_cursor;
    _ctx->disable_cursor = fbterm_disable_cursor;
    _ctx->set_cursor_pos = fbterm_set_cursor_pos;
    _ctx->get_cursor_pos = fbterm_get_cursor_pos;
    _ctx->set_text_fg = fbterm_set_text_fg;
    _ctx->set_text_bg = fbterm_set_text_bg;
    _ctx->set_text_fg_bright = fbterm_set_text_fg_bright;
    _ctx->set_text_bg_bright = fbterm_set_text_bg_bright;
    _ctx->set_text_fg_rgb = fbterm_set_text_fg_rgb;
    _ctx->set_text_bg_rgb = fbterm_set_text_bg_rgb;
    _ctx->set_text_fg_default = fbterm_set_text_fg_default;
    _ctx->set_text_bg_default = fbterm_set_text_bg_default;
    _ctx->move_character = fbterm_move_character;
    _ctx->scroll = fbterm_scroll;
    _ctx->revscroll = fbterm_revscroll;
    _ctx->swap_palette = fbterm_swap_palette;
    _ctx->save_state = fbterm_save_state;
    _ctx->restore_state = fbterm_restore_state;
    _ctx->double_buffer_flush = fbterm_double_buffer_flush;
    _ctx->full_refresh = fbterm_full_refresh;
    _ctx->deinit = fbterm_deinit;

    term_context_reinit(_ctx);

    return _ctx;
}