backends/fb.c at 044a96b48e81cb895007115ac78ca9af8cf4c6ef · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / backends / fb.c
at 044a96b48e81cb895007115ac78ca9af8cf4c6ef 48 kB view raw
   1/* Copyright (C) 2022-2023 mintsuki and contributors.
   2 *
   3 * Redistribution and use in source and binary forms, with or without
   4 * modification, are permitted provided that the following conditions are met:
   5 *
   6 * 1. Redistributions of source code must retain the above copyright notice,
   7 *    this list of conditions and the following disclaimer.
   8 *
   9 * 2. Redistributions in binary form must reproduce the above copyright notice,
  10 *    this list of conditions and the following disclaimer in the documentation
  11 *    and/or other materials provided with the distribution.
  12 *
  13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  17 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23 * POSSIBILITY OF SUCH DAMAGE.
  24 */
  25
  26#include <stdint.h>
  27#include <stddef.h>
  28
  29#include "../flanterm.h"
  30#include "fb.h"
  31
  32void *memset(void *, int, size_t);
  33void *memcpy(void *, const void *, size_t);
  34
  35// Builtin font originally taken from:
  36// https://github.com/viler-int10h/vga-text-mode-fonts/raw/master/FONTS/PC-OTHER/TOSH-SAT.F16
  37static const uint8_t builtin_font[] = {
  38  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  39  0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x42, 0x81, 0x81, 0xa5, 0xa5, 0x81,
  40  0x81, 0xa5, 0x99, 0x81, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x3c, 0x7e, 0xff,
  41  0xff, 0xdb, 0xdb, 0xff, 0xff, 0xdb, 0xe7, 0xff, 0x7e, 0x3c, 0x00, 0x00,
  42  0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0x7c, 0x7c, 0x38, 0x38, 0x10,
  43  0x10, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe,
  44  0x7c, 0x7c, 0x38, 0x38, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
  45  0x3c, 0x3c, 0xdb, 0xff, 0xff, 0xdb, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00,
  46  0x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0xff, 0x66, 0x18, 0x18,
  47  0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x78,
  48  0x78, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
  49  0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  50  0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0x84, 0x84, 0xcc, 0x78, 0x00,
  51  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd,
  52  0xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x1e,
  53  0x0e, 0x1e, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
  54  0x00, 0x00, 0x00, 0x78, 0xcc, 0xcc, 0xcc, 0x78, 0x30, 0xfc, 0x30, 0x30,
  55  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x18, 0x1c, 0x1e, 0x16, 0x12,
  56  0x10, 0x10, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x30, 0x38, 0x2c,
  57  0x26, 0x32, 0x3a, 0x2e, 0x26, 0x22, 0x62, 0xe2, 0xc6, 0x0e, 0x0c, 0x00,
  58  0x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18,
  59  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf8, 0xfe,
  60  0xf8, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
  61  0x06, 0x0e, 0x3e, 0xfe, 0x3e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
  62  0x00, 0x00, 0x30, 0x78, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0xfc, 0x78,
  63  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc,
  64  0xcc, 0xcc, 0x00, 0xcc, 0xcc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xdb,
  65  0xdb, 0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00,
  66  0x00, 0x00, 0x7c, 0xc6, 0x60, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x0c,
  67  0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  68  0x00, 0x00, 0xfe, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x78,
  69  0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0xfc, 0x78, 0x30, 0xfc, 0x00, 0x00,
  70  0x00, 0x00, 0x30, 0x78, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
  71  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
  72  0x30, 0x30, 0xfc, 0x78, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  73  0x00, 0x18, 0x0c, 0xfe, 0xfe, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
  74  0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x60, 0xfe, 0xfe, 0x60, 0x30, 0x00,
  75  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0,
  76  0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  77  0x00, 0x24, 0x66, 0xff, 0xff, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00,
  78  0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe, 0xfe,
  79  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe, 0x7c, 0x7c,
  80  0x38, 0x38, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  81  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  82  0x00, 0x00, 0x30, 0x78, 0x78, 0x78, 0x78, 0x30, 0x30, 0x30, 0x00, 0x30,
  83  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x00,
  84  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x6c,
  85  0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00,
  86  0x00, 0x18, 0x18, 0x7c, 0xc6, 0xc0, 0xc0, 0x7c, 0x06, 0x06, 0xc6, 0x7c,
  87  0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0x0c, 0x0c, 0x18, 0x38,
  88  0x30, 0x60, 0x60, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
  89  0x6c, 0x38, 0x30, 0x76, 0xde, 0xcc, 0xcc, 0xde, 0x76, 0x00, 0x00, 0x00,
  90  0x00, 0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  91  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0x60, 0x60, 0x60,
  92  0x60, 0x60, 0x60, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30,
  93  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00,
  94  0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x38, 0xfe, 0x38, 0x6c, 0x00, 0x00,
  95  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e,
  96  0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  97  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00,
  98  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00,
  99  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 100  0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x06,
 101  0x0c, 0x0c, 0x18, 0x38, 0x30, 0x60, 0x60, 0xc0, 0xc0, 0x00, 0x00, 0x00,
 102  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0xc6,
 103  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18,
 104  0x18, 0x18, 0x18, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
 105  0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00,
 106  0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0x06, 0xc6,
 107  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x0c, 0x1c, 0x3c, 0x6c, 0xcc,
 108  0xfe, 0x0c, 0x0c, 0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0,
 109  0xc0, 0xc0, 0xfc, 0x06, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00,
 110  0x00, 0x00, 0x3c, 0x60, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
 111  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18,
 112  0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
 113  0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00,
 114  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x0c,
 115  0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
 116  0x18, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 117  0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00,
 118  0x00, 0x00, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x60, 0x30, 0x18, 0x0c,
 119  0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00,
 120  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x60,
 121  0x30, 0x18, 0x0c, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00, 0x00, 0x00,
 122  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x00, 0x30,
 123  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xde, 0xde,
 124  0xde, 0xde, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
 125  0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
 126  0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
 127  0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0,
 128  0xc0, 0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xcc,
 129  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00, 0x00, 0x00,
 130  0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
 131  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0,
 132  0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
 133  0xc0, 0xc0, 0xc0, 0xde, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00,
 134  0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6,
 135  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30,
 136  0x30, 0x30, 0x30, 0x30, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x0c,
 137  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00,
 138  0x00, 0x00, 0xc6, 0xc6, 0xcc, 0xd8, 0xf0, 0xe0, 0xf0, 0xd8, 0xcc, 0xc6,
 139  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
 140  0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
 141  0xee, 0xfe, 0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
 142  0x00, 0x00, 0xc6, 0xc6, 0xe6, 0xe6, 0xf6, 0xde, 0xce, 0xce, 0xc6, 0xc6,
 143  0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
 144  0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6,
 145  0xc6, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00,
 146  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xf6, 0xda,
 147  0x6c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc,
 148  0xd8, 0xcc, 0xcc, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
 149  0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00,
 150  0x00, 0x00, 0xff, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
 151  0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
 152  0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
 153  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x10, 0x00, 0x00, 0x00,
 154  0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xd6, 0xfe, 0x6c,
 155  0x6c, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x38,
 156  0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc, 0xcc,
 157  0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00,
 158  0x00, 0x00, 0xfe, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc0, 0xc0,
 159  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x60, 0x60, 0x60, 0x60, 0x60,
 160  0x60, 0x60, 0x60, 0x60, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0,
 161  0x60, 0x60, 0x30, 0x38, 0x18, 0x0c, 0x0c, 0x06, 0x06, 0x00, 0x00, 0x00,
 162  0x00, 0x00, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
 163  0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00,
 164  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 165  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
 166  0x00, 0x00, 0x18, 0x18, 0x18, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 167  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0x06, 0x06,
 168  0x7e, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0,
 169  0xc0, 0xdc, 0xe6, 0xc6, 0xc6, 0xc6, 0xc6, 0xe6, 0xdc, 0x00, 0x00, 0x00,
 170  0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0, 0xc6,
 171  0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x06, 0x06, 0x76, 0xce, 0xc6,
 172  0xc6, 0xc6, 0xc6, 0xce, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 173  0x00, 0x7c, 0xc6, 0xc6, 0xfe, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00,
 174  0x00, 0x00, 0x1c, 0x36, 0x30, 0x30, 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30,
 175  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xce, 0xc6,
 176  0xc6, 0xc6, 0xce, 0x76, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0xc0, 0xc0,
 177  0xc0, 0xdc, 0xe6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
 178  0x00, 0x00, 0x18, 0x00, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
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 211  0x7c, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x18, 0x30, 0x00, 0x7c, 0xc6, 0xc6,
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 230  0x18, 0x30, 0x60, 0x00, 0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0,
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 314  0x18, 0x18, 0x18, 0x18, 0x18, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00,
 315  0x00, 0x00, 0x00, 0x00, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0xff,
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 326  0x18, 0x18, 0x18, 0x18, 0x18, 0xff, 0xff, 0x18, 0x18, 0xff, 0xff, 0x18,
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 330  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 331  0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 332  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xf0, 0xf0, 0xf0,
 333  0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
 334  0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
 335  0x0f, 0x0f, 0x0f, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 336  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 337  0x00, 0x76, 0xd6, 0xdc, 0xc8, 0xc8, 0xdc, 0xd6, 0x76, 0x00, 0x00, 0x00,
 338  0x00, 0x00, 0x78, 0xcc, 0xcc, 0xcc, 0xd8, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc,
 339  0xd8, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0xfe, 0xc6, 0xc6, 0xc0, 0xc0, 0xc0,
 340  0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 341  0x00, 0x7e, 0xfe, 0x24, 0x24, 0x24, 0x24, 0x66, 0xc6, 0x00, 0x00, 0x00,
 342  0x00, 0x00, 0xfe, 0xfe, 0xc2, 0x60, 0x30, 0x18, 0x30, 0x60, 0xc2, 0xfe,
 343  0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc8, 0xcc,
 344  0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 345  0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x76, 0x6c, 0x60, 0xc0, 0x00,
 346  0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0xfc, 0x98, 0x18, 0x18, 0x18, 0x18,
 347  0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x30, 0x30, 0x78, 0xcc, 0xcc,
 348  0xcc, 0x78, 0x30, 0x30, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
 349  0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00, 0x00, 0x00,
 350  0x00, 0x00, 0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x6c, 0x6c,
 351  0xee, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0x60, 0x30, 0x78, 0xcc,
 352  0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 353  0x00, 0x76, 0xbb, 0x99, 0x99, 0xdd, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00,
 354  0x00, 0x00, 0x02, 0x06, 0x3c, 0x6c, 0xce, 0xd6, 0xd6, 0xe6, 0x6c, 0x78,
 355  0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x30, 0x60, 0xc0, 0xc0, 0xfe,
 356  0xc0, 0xc0, 0x60, 0x30, 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
 357  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00,
 358  0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00,
 359  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0xfc,
 360  0x30, 0x30, 0x00, 0x00, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 361  0x60, 0x30, 0x18, 0x0c, 0x18, 0x30, 0x60, 0x00, 0xfc, 0x00, 0x00, 0x00,
 362  0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0xc0, 0x60, 0x30, 0x18, 0x00,
 363  0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c, 0x36, 0x36, 0x30, 0x30, 0x30,
 364  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x18, 0x18, 0x18,
 365  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xd8, 0xd8, 0x70, 0x00, 0x00, 0x00,
 366  0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0xfc, 0x00, 0x30, 0x30, 0x00,
 367  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00,
 368  0x76, 0xdc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0xcc, 0xcc,
 369  0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 370  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00,
 371  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30,
 372  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x0c, 0x0c,
 373  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0x6c, 0x3c, 0x1c, 0x0c, 0x00, 0x00,
 374  0x00, 0xd8, 0xec, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x00, 0x00, 0x00, 0x00,
 375  0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c, 0x0c, 0x18, 0x30, 0x60, 0x7c,
 376  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 377  0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00,
 378  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 379  0x00, 0x00, 0x00, 0x00
 380};
 381
 382static void flanterm_fb_save_state(struct flanterm_context *_ctx) {
 383    struct flanterm_fb_context *ctx = (void *)_ctx;
 384    ctx->saved_state_text_fg = ctx->text_fg;
 385    ctx->saved_state_text_bg = ctx->text_bg;
 386    ctx->saved_state_cursor_x = ctx->cursor_x;
 387    ctx->saved_state_cursor_y = ctx->cursor_y;
 388}
 389
 390static void flanterm_fb_restore_state(struct flanterm_context *_ctx) {
 391    struct flanterm_fb_context *ctx = (void *)_ctx;
 392    ctx->text_fg = ctx->saved_state_text_fg;
 393    ctx->text_bg = ctx->saved_state_text_bg;
 394    ctx->cursor_x = ctx->saved_state_cursor_x;
 395    ctx->cursor_y = ctx->saved_state_cursor_y;
 396}
 397
 398static void flanterm_fb_swap_palette(struct flanterm_context *_ctx) {
 399    struct flanterm_fb_context *ctx = (void *)_ctx;
 400    uint32_t tmp = ctx->text_bg;
 401    ctx->text_bg = ctx->text_fg;
 402    ctx->text_fg = tmp;
 403}
 404
 405static void plot_char(struct flanterm_context *_ctx, struct flanterm_fb_char *c, size_t x, size_t y) {
 406    struct flanterm_fb_context *ctx = (void *)_ctx;
 407
 408    if (x >= _ctx->cols || y >= _ctx->rows) {
 409        return;
 410    }
 411    
 412#ifdef FLANTERM_FB_DISABLE_CANVAS
 413    uint32_t default_bg = ctx->default_bg;
 414#endif
 415
 416    x = ctx->offset_x + x * ctx->glyph_width;
 417    y = ctx->offset_y + y * ctx->glyph_height;
 418
 419    bool *glyph = &ctx->font_bool[c->c * ctx->font_height * ctx->font_width];
 420    // naming: fx,fy for font coordinates, gx,gy for glyph coordinates
 421    for (size_t gy = 0; gy < ctx->glyph_height; gy++) {
 422        uint8_t fy = gy / ctx->font_scale_y;
 423        volatile uint32_t *fb_line = ctx->framebuffer + x + (y + gy) * (ctx->pitch / 4);
 424        
 425#ifndef FLANTERM_FB_DISABLE_CANVAS
 426        uint32_t *canvas_line = ctx->canvas + x + (y + gy) * ctx->width;
 427#endif
 428        
 429        for (size_t fx = 0; fx < ctx->font_width; fx++) {
 430            bool draw = glyph[fy * ctx->font_width + fx];
 431            for (size_t i = 0; i < ctx->font_scale_x; i++) {
 432                size_t gx = ctx->font_scale_x * fx + i;
 433#ifndef FLANTERM_FB_DISABLE_CANVAS
 434                uint32_t bg = c->bg == 0xffffffff ? canvas_line[gx] : c->bg;
 435                uint32_t fg = c->fg == 0xffffffff ? canvas_line[gx] : c->fg;
 436#else
 437                uint32_t bg = c->bg == 0xffffffff ? default_bg : c->bg;
 438                uint32_t fg = c->fg == 0xffffffff ? default_bg : c->fg;
 439#endif
 440                fb_line[gx] = draw ? fg : bg;
 441            }
 442        }
 443    }
 444}
 445
 446static void plot_char_fast(struct flanterm_context *_ctx, struct flanterm_fb_char *old, struct flanterm_fb_char *c, size_t x, size_t y) {
 447    struct flanterm_fb_context *ctx = (void *)_ctx;
 448
 449    if (x >= _ctx->cols || y >= _ctx->rows) {
 450        return;
 451    }
 452
 453    x = ctx->offset_x + x * ctx->glyph_width;
 454    y = ctx->offset_y + y * ctx->glyph_height;
 455    
 456#ifdef FLANTERM_FB_DISABLE_CANVAS
 457    uint32_t default_bg = ctx->default_bg;
 458#endif
 459
 460    bool *new_glyph = &ctx->font_bool[c->c * ctx->font_height * ctx->font_width];
 461    bool *old_glyph = &ctx->font_bool[old->c * ctx->font_height * ctx->font_width];
 462    for (size_t gy = 0; gy < ctx->glyph_height; gy++) {
 463        uint8_t fy = gy / ctx->font_scale_y;
 464        volatile uint32_t *fb_line = ctx->framebuffer + x + (y + gy) * (ctx->pitch / 4);
 465        uint32_t *canvas_line = ctx->canvas + x + (y + gy) * ctx->width;
 466        for (size_t fx = 0; fx < ctx->font_width; fx++) {
 467            bool old_draw = old_glyph[fy * ctx->font_width + fx];
 468            bool new_draw = new_glyph[fy * ctx->font_width + fx];
 469            if (old_draw == new_draw)
 470                continue;
 471            for (size_t i = 0; i < ctx->font_scale_x; i++) {
 472                size_t gx = ctx->font_scale_x * fx + i;
 473#ifndef FLANTERM_FB_DISABLE_CANVAS
 474                uint32_t bg = c->bg == 0xffffffff ? canvas_line[gx] : c->bg;
 475                uint32_t fg = c->fg == 0xffffffff ? canvas_line[gx] : c->fg;
 476#else
 477                uint32_t bg = c->bg == 0xffffffff ? default_bg : c->bg;
 478                uint32_t fg = c->fg == 0xffffffff ? default_bg : c->fg;
 479#endif
 480                fb_line[gx] = new_draw ? fg : bg;
 481            }
 482        }
 483    }
 484}
 485
 486static inline bool compare_char(struct flanterm_fb_char *a, struct flanterm_fb_char *b) {
 487    return !(a->c != b->c || a->bg != b->bg || a->fg != b->fg);
 488}
 489
 490static void push_to_queue(struct flanterm_context *_ctx, struct flanterm_fb_char *c, size_t x, size_t y) {
 491    struct flanterm_fb_context *ctx = (void *)_ctx;
 492
 493    if (x >= _ctx->cols || y >= _ctx->rows) {
 494        return;
 495    }
 496
 497    size_t i = y * _ctx->cols + x;
 498
 499    struct flanterm_fb_queue_item *q = ctx->map[i];
 500
 501    if (q == NULL) {
 502        if (compare_char(&ctx->grid[i], c)) {
 503            return;
 504        }
 505        q = &ctx->queue[ctx->queue_i++];
 506        q->x = x;
 507        q->y = y;
 508        ctx->map[i] = q;
 509    }
 510
 511    q->c = *c;
 512}
 513
 514static void flanterm_fb_revscroll(struct flanterm_context *_ctx) {
 515    struct flanterm_fb_context *ctx = (void *)_ctx;
 516
 517    for (size_t i = (_ctx->scroll_bottom_margin - 1) * _ctx->cols - 1;
 518         i >= _ctx->scroll_top_margin * _ctx->cols; i--) {
 519        if (i == (size_t)-1) {
 520            break;
 521        }
 522        struct flanterm_fb_char *c;
 523        struct flanterm_fb_queue_item *q = ctx->map[i];
 524        if (q != NULL) {
 525            c = &q->c;
 526        } else {
 527            c = &ctx->grid[i];
 528        }
 529        push_to_queue(_ctx, c, (i + _ctx->cols) % _ctx->cols, (i + _ctx->cols) / _ctx->cols);
 530    }
 531
 532    // Clear the first line of the screen.
 533    struct flanterm_fb_char empty;
 534    empty.c  = ' ';
 535    empty.fg = ctx->text_fg;
 536    empty.bg = ctx->text_bg;
 537    for (size_t i = 0; i < _ctx->cols; i++) {
 538        push_to_queue(_ctx, &empty, i, _ctx->scroll_top_margin);
 539    }
 540}
 541
 542static void flanterm_fb_scroll(struct flanterm_context *_ctx) {
 543    struct flanterm_fb_context *ctx = (void *)_ctx;
 544
 545    for (size_t i = (_ctx->scroll_top_margin + 1) * _ctx->cols;
 546         i < _ctx->scroll_bottom_margin * _ctx->cols; i++) {
 547        struct flanterm_fb_char *c;
 548        struct flanterm_fb_queue_item *q = ctx->map[i];
 549        if (q != NULL) {
 550            c = &q->c;
 551        } else {
 552            c = &ctx->grid[i];
 553        }
 554        push_to_queue(_ctx, c, (i - _ctx->cols) % _ctx->cols, (i - _ctx->cols) / _ctx->cols);
 555    }
 556
 557    // Clear the last line of the screen.
 558    struct flanterm_fb_char empty;
 559    empty.c  = ' ';
 560    empty.fg = ctx->text_fg;
 561    empty.bg = ctx->text_bg;
 562    for (size_t i = 0; i < _ctx->cols; i++) {
 563        push_to_queue(_ctx, &empty, i, _ctx->scroll_bottom_margin - 1);
 564    }
 565}
 566
 567static void flanterm_fb_clear(struct flanterm_context *_ctx, bool move) {
 568    struct flanterm_fb_context *ctx = (void *)_ctx;
 569
 570    struct flanterm_fb_char empty;
 571    empty.c  = ' ';
 572    empty.fg = ctx->text_fg;
 573    empty.bg = ctx->text_bg;
 574    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
 575        push_to_queue(_ctx, &empty, i % _ctx->cols, i / _ctx->cols);
 576    }
 577
 578    if (move) {
 579        ctx->cursor_x = 0;
 580        ctx->cursor_y = 0;
 581    }
 582}
 583
 584static void flanterm_fb_set_cursor_pos(struct flanterm_context *_ctx, size_t x, size_t y) {
 585    struct flanterm_fb_context *ctx = (void *)_ctx;
 586
 587    if (x >= _ctx->cols) {
 588        if ((int)x < 0) {
 589            x = 0;
 590        } else {
 591            x = _ctx->cols - 1;
 592        }
 593    }
 594    if (y >= _ctx->rows) {
 595        if ((int)y < 0) {
 596            y = 0;
 597        } else {
 598            y = _ctx->rows - 1;
 599        }
 600    }
 601    ctx->cursor_x = x;
 602    ctx->cursor_y = y;
 603}
 604
 605static void flanterm_fb_get_cursor_pos(struct flanterm_context *_ctx, size_t *x, size_t *y) {
 606    struct flanterm_fb_context *ctx = (void *)_ctx;
 607
 608    *x = ctx->cursor_x >= _ctx->cols ? _ctx->cols - 1 : ctx->cursor_x;
 609    *y = ctx->cursor_y >= _ctx->rows ? _ctx->rows - 1 : ctx->cursor_y;
 610}
 611
 612static void flanterm_fb_move_character(struct flanterm_context *_ctx, size_t new_x, size_t new_y, size_t old_x, size_t old_y) {
 613    struct flanterm_fb_context *ctx = (void *)_ctx;
 614
 615    if (old_x >= _ctx->cols || old_y >= _ctx->rows
 616     || new_x >= _ctx->cols || new_y >= _ctx->rows) {
 617        return;
 618    }
 619
 620    size_t i = old_x + old_y * _ctx->cols;
 621
 622    struct flanterm_fb_char *c;
 623    struct flanterm_fb_queue_item *q = ctx->map[i];
 624    if (q != NULL) {
 625        c = &q->c;
 626    } else {
 627        c = &ctx->grid[i];
 628    }
 629
 630    push_to_queue(_ctx, c, new_x, new_y);
 631}
 632
 633static void flanterm_fb_set_text_fg(struct flanterm_context *_ctx, size_t fg) {
 634    struct flanterm_fb_context *ctx = (void *)_ctx;
 635
 636    ctx->text_fg = ctx->ansi_colours[fg];
 637}
 638
 639static void flanterm_fb_set_text_bg(struct flanterm_context *_ctx, size_t bg) {
 640    struct flanterm_fb_context *ctx = (void *)_ctx;
 641
 642    ctx->text_bg = ctx->ansi_colours[bg];
 643}
 644
 645static void flanterm_fb_set_text_fg_bright(struct flanterm_context *_ctx, size_t fg) {
 646    struct flanterm_fb_context *ctx = (void *)_ctx;
 647
 648    ctx->text_fg = ctx->ansi_bright_colours[fg];
 649}
 650
 651static void flanterm_fb_set_text_bg_bright(struct flanterm_context *_ctx, size_t bg) {
 652    struct flanterm_fb_context *ctx = (void *)_ctx;
 653
 654    ctx->text_bg = ctx->ansi_bright_colours[bg];
 655}
 656
 657static void flanterm_fb_set_text_fg_rgb(struct flanterm_context *_ctx, uint32_t fg) {
 658    struct flanterm_fb_context *ctx = (void *)_ctx;
 659
 660    ctx->text_fg = fg;
 661}
 662
 663static void flanterm_fb_set_text_bg_rgb(struct flanterm_context *_ctx, uint32_t bg) {
 664    struct flanterm_fb_context *ctx = (void *)_ctx;
 665
 666    ctx->text_bg = bg;
 667}
 668
 669static void flanterm_fb_set_text_fg_default(struct flanterm_context *_ctx) {
 670    struct flanterm_fb_context *ctx = (void *)_ctx;
 671
 672    ctx->text_fg = ctx->default_fg;
 673}
 674
 675static void flanterm_fb_set_text_bg_default(struct flanterm_context *_ctx) {
 676    struct flanterm_fb_context *ctx = (void *)_ctx;
 677
 678    ctx->text_bg = 0xffffffff;
 679}
 680
 681static void flanterm_fb_set_text_fg_default_bright(struct flanterm_context *_ctx) {
 682    struct flanterm_fb_context *ctx = (void *)_ctx;
 683
 684    ctx->text_fg = ctx->default_fg_bright;
 685}
 686
 687static void flanterm_fb_set_text_bg_default_bright(struct flanterm_context *_ctx) {
 688    struct flanterm_fb_context *ctx = (void *)_ctx;
 689
 690    ctx->text_bg = ctx->default_bg_bright;
 691}
 692
 693static void draw_cursor(struct flanterm_context *_ctx) {
 694    struct flanterm_fb_context *ctx = (void *)_ctx;
 695
 696    if (ctx->cursor_x >= _ctx->cols || ctx->cursor_y >= _ctx->rows) {
 697        return;
 698    }
 699
 700    size_t i = ctx->cursor_x + ctx->cursor_y * _ctx->cols;
 701
 702    struct flanterm_fb_char c;
 703    struct flanterm_fb_queue_item *q = ctx->map[i];
 704    if (q != NULL) {
 705        c = q->c;
 706    } else {
 707        c = ctx->grid[i];
 708    }
 709    uint32_t tmp = c.fg;
 710    c.fg = c.bg;
 711    c.bg = tmp;
 712    plot_char(_ctx, &c, ctx->cursor_x, ctx->cursor_y);
 713    if (q != NULL) {
 714        ctx->grid[i] = q->c;
 715        ctx->map[i] = NULL;
 716    }
 717}
 718
 719static void flanterm_fb_double_buffer_flush(struct flanterm_context *_ctx) {
 720    struct flanterm_fb_context *ctx = (void *)_ctx;
 721
 722    if (_ctx->cursor_enabled) {
 723        draw_cursor(_ctx);
 724    }
 725
 726    for (size_t i = 0; i < ctx->queue_i; i++) {
 727        struct flanterm_fb_queue_item *q = &ctx->queue[i];
 728        size_t offset = q->y * _ctx->cols + q->x;
 729        if (ctx->map[offset] == NULL) {
 730            continue;
 731        }
 732        struct flanterm_fb_char *old = &ctx->grid[offset];
 733        if (q->c.bg == old->bg && q->c.fg == old->fg) {
 734            plot_char_fast(_ctx, old, &q->c, q->x, q->y);
 735        } else {
 736            plot_char(_ctx, &q->c, q->x, q->y);
 737        }
 738        ctx->grid[offset] = q->c;
 739        ctx->map[offset] = NULL;
 740    }
 741
 742    if ((ctx->old_cursor_x != ctx->cursor_x || ctx->old_cursor_y != ctx->cursor_y) || _ctx->cursor_enabled == false) {
 743        if (ctx->old_cursor_x < _ctx->cols && ctx->old_cursor_y < _ctx->rows) {
 744            plot_char(_ctx, &ctx->grid[ctx->old_cursor_x + ctx->old_cursor_y * _ctx->cols], ctx->old_cursor_x, ctx->old_cursor_y);
 745        }
 746    }
 747
 748    ctx->old_cursor_x = ctx->cursor_x;
 749    ctx->old_cursor_y = ctx->cursor_y;
 750
 751    ctx->queue_i = 0;
 752}
 753
 754static void flanterm_fb_raw_putchar(struct flanterm_context *_ctx, uint8_t c) {
 755    struct flanterm_fb_context *ctx = (void *)_ctx;
 756
 757    if (ctx->cursor_x >= _ctx->cols && (ctx->cursor_y < _ctx->scroll_bottom_margin - 1 || _ctx->scroll_enabled)) {
 758        ctx->cursor_x = 0;
 759        ctx->cursor_y++;
 760        if (ctx->cursor_y == _ctx->scroll_bottom_margin) {
 761            ctx->cursor_y--;
 762            flanterm_fb_scroll(_ctx);
 763        }
 764        if (ctx->cursor_y >= _ctx->cols) {
 765            ctx->cursor_y = _ctx->cols - 1;
 766        }
 767    }
 768
 769    struct flanterm_fb_char ch;
 770    ch.c  = c;
 771    ch.fg = ctx->text_fg;
 772    ch.bg = ctx->text_bg;
 773    push_to_queue(_ctx, &ch, ctx->cursor_x++, ctx->cursor_y);
 774}
 775
 776static void flanterm_fb_full_refresh(struct flanterm_context *_ctx) {
 777    struct flanterm_fb_context *ctx = (void *)_ctx;
 778    
 779#ifdef FLANTERM_FB_DISABLE_CANVAS
 780    uint32_t default_bg = ctx->default_bg;
 781#endif
 782
 783    for (size_t y = 0; y < ctx->height; y++) {
 784        for (size_t x = 0; x < ctx->width; x++) {
 785#ifndef FLANTERM_FB_DISABLE_CANVAS
 786            ctx->framebuffer[y * (ctx->pitch / sizeof(uint32_t)) + x] = ctx->canvas[y * ctx->width + x];
 787#else
 788            ctx->framebuffer[y * (ctx->pitch / sizeof(uint32_t)) + x] = default_bg;
 789#endif
 790        }
 791    }
 792
 793    for (size_t i = 0; i < (size_t)_ctx->rows * _ctx->cols; i++) {
 794        size_t x = i % _ctx->cols;
 795        size_t y = i / _ctx->cols;
 796
 797        plot_char(_ctx, &ctx->grid[i], x, y);
 798    }
 799
 800    if (_ctx->cursor_enabled) {
 801        draw_cursor(_ctx);
 802    }
 803}
 804
 805static void flanterm_fb_deinit(struct flanterm_context *_ctx, void (*_free)(void *, size_t)) {
 806    struct flanterm_fb_context *ctx = (void *)_ctx;
 807
 808    _free(ctx->font_bits, ctx->font_bits_size);
 809    _free(ctx->font_bool, ctx->font_bool_size);
 810    _free(ctx->grid, ctx->grid_size);
 811    _free(ctx->queue, ctx->queue_size);
 812    _free(ctx->map, ctx->map_size);
 813    
 814#ifndef FLANTERM_FB_DISABLE_CANVAS
 815    _free(ctx->canvas, ctx->canvas_size);
 816#endif
 817    
 818    _free(ctx, sizeof(struct flanterm_fb_context));
 819}
 820
 821struct flanterm_context *flanterm_fb_init(
 822    void *(*_malloc)(size_t),
 823    uint32_t *framebuffer, size_t width, size_t height, size_t pitch,
 824#ifndef FLANTERM_FB_DISABLE_CANVAS
 825    uint32_t *canvas,
 826#endif
 827    uint32_t *ansi_colours, uint32_t *ansi_bright_colours,
 828    uint32_t *default_bg, uint32_t *default_fg,
 829    uint32_t *default_bg_bright, uint32_t *default_fg_bright,
 830    void *font, size_t font_width, size_t font_height, size_t font_spacing,
 831    size_t font_scale_x, size_t font_scale_y,
 832    size_t margin
 833) {
 834    struct flanterm_fb_context *ctx = _malloc(sizeof(struct flanterm_fb_context));
 835
 836    struct flanterm_context *_ctx = (void *)ctx;
 837
 838    memset(ctx, 0, sizeof(struct flanterm_fb_context));
 839
 840    if (ansi_colours != NULL) {
 841        memcpy(ctx->ansi_colours, ansi_colours, sizeof(ctx->ansi_colours));
 842    } else {
 843        ctx->ansi_colours[0] = 0x00000000; // black
 844        ctx->ansi_colours[1] = 0x00aa0000; // red
 845        ctx->ansi_colours[2] = 0x0000aa00; // green
 846        ctx->ansi_colours[3] = 0x00aa5500; // brown
 847        ctx->ansi_colours[4] = 0x000000aa; // blue
 848        ctx->ansi_colours[5] = 0x00aa00aa; // magenta
 849        ctx->ansi_colours[6] = 0x0000aaaa; // cyan
 850        ctx->ansi_colours[7] = 0x00aaaaaa; // grey
 851    }
 852
 853    if (ansi_bright_colours != NULL) {
 854        memcpy(ctx->ansi_bright_colours, ansi_bright_colours, sizeof(ctx->ansi_bright_colours));
 855    } else {
 856        ctx->ansi_bright_colours[0] = 0x00555555; // black
 857        ctx->ansi_bright_colours[1] = 0x00ff5555; // red
 858        ctx->ansi_bright_colours[2] = 0x0055ff55; // green
 859        ctx->ansi_bright_colours[3] = 0x00ffff55; // brown
 860        ctx->ansi_bright_colours[4] = 0x005555ff; // blue
 861        ctx->ansi_bright_colours[5] = 0x00ff55ff; // magenta
 862        ctx->ansi_bright_colours[6] = 0x0055ffff; // cyan
 863        ctx->ansi_bright_colours[7] = 0x00ffffff; // grey
 864    }
 865
 866    if (default_bg != NULL) {
 867        ctx->default_bg = *default_bg;
 868    } else {
 869        ctx->default_bg = 0x00000000; // background (black)
 870    }
 871
 872    if (default_fg != NULL) {
 873        ctx->default_fg = *default_fg;
 874    } else {
 875        ctx->default_fg = 0x00aaaaaa; // foreground (grey)
 876    }
 877
 878    if (default_bg_bright != NULL) {
 879        ctx->default_bg_bright = *default_bg_bright;
 880    } else {
 881        ctx->default_bg_bright = 0x00555555; // background (black)
 882    }
 883
 884    if (default_fg_bright != NULL) {
 885        ctx->default_fg_bright = *default_fg_bright;
 886    } else {
 887        ctx->default_fg_bright = 0x00ffffff; // foreground (grey)
 888    }
 889
 890    ctx->text_fg = ctx->default_fg;
 891    ctx->text_bg = 0xffffffff;
 892
 893    ctx->framebuffer = (void *)framebuffer;
 894    ctx->width = width;
 895    ctx->height = height;
 896    ctx->pitch = pitch;
 897
 898#define FONT_BYTES ((font_width * font_height * FLANTERM_FB_FONT_GLYPHS) / 8)
 899
 900    if (font != NULL) {
 901        ctx->font_width = font_width;
 902        ctx->font_height = font_height;
 903        ctx->font_bits = _malloc(FONT_BYTES);
 904        memcpy(ctx->font_bits, font, FONT_BYTES);
 905    } else {
 906        ctx->font_width = font_width = 8;
 907        ctx->font_height = font_height = 16;
 908        font_spacing = 1;
 909        ctx->font_bits = _malloc(FONT_BYTES);
 910        memcpy(ctx->font_bits, builtin_font, FONT_BYTES);
 911    }
 912
 913    ctx->font_bits_size = FONT_BYTES;
 914
 915#undef FONT_BYTES
 916
 917    ctx->font_width += font_spacing;
 918
 919    ctx->font_bool_size = FLANTERM_FB_FONT_GLYPHS * font_height * ctx->font_width * sizeof(bool);
 920    ctx->font_bool = _malloc(ctx->font_bool_size);
 921
 922    for (size_t i = 0; i < FLANTERM_FB_FONT_GLYPHS; i++) {
 923        uint8_t *glyph = &ctx->font_bits[i * font_height];
 924
 925        for (size_t y = 0; y < font_height; y++) {
 926            // NOTE: the characters in VGA fonts are always one byte wide.
 927            // 9 dot wide fonts have 8 dots and one empty column, except
 928            // characters 0xC0-0xDF replicate column 9.
 929            for (size_t x = 0; x < 8; x++) {
 930                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;
 931
 932                if ((glyph[y] & (0x80 >> x))) {
 933                    ctx->font_bool[offset] = true;
 934                } else {
 935                    ctx->font_bool[offset] = false;
 936                }
 937            }
 938            // fill columns above 8 like VGA Line Graphics Mode does
 939            for (size_t x = 8; x < ctx->font_width; x++) {
 940                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;
 941
 942                if (i >= 0xc0 && i <= 0xdf) {
 943                    ctx->font_bool[offset] = (glyph[y] & 1);
 944                } else {
 945                    ctx->font_bool[offset] = false;
 946                }
 947            }
 948        }
 949    }
 950
 951    ctx->font_scale_x = font_scale_x;
 952    ctx->font_scale_y = font_scale_y;
 953
 954    ctx->glyph_width = ctx->font_width * font_scale_x;
 955    ctx->glyph_height = font_height * font_scale_y;
 956
 957    _ctx->cols = (ctx->width - margin * 2) / ctx->glyph_width;
 958    _ctx->rows = (ctx->height - margin * 2) / ctx->glyph_height;
 959
 960    ctx->offset_x = margin + ((ctx->width - margin * 2) % ctx->glyph_width) / 2;
 961    ctx->offset_y = margin + ((ctx->height - margin * 2) % ctx->glyph_height) / 2;
 962
 963    ctx->grid_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_char);
 964    ctx->grid = _malloc(ctx->grid_size);
 965    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
 966        ctx->grid[i].c = ' ';
 967        ctx->grid[i].fg = ctx->text_fg;
 968        ctx->grid[i].bg = ctx->text_bg;
 969    }
 970
 971    ctx->queue_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_queue_item);
 972    ctx->queue = _malloc(ctx->queue_size);
 973    ctx->queue_i = 0;
 974    memset(ctx->queue, 0, ctx->queue_size);
 975
 976    ctx->map_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_queue_item *);
 977    ctx->map = _malloc(ctx->map_size);
 978    memset(ctx->map, 0, ctx->map_size);
 979
 980#ifndef FLANTERM_FB_DISABLE_CANVAS
 981    ctx->canvas_size = ctx->width * ctx->height * sizeof(uint32_t);
 982    ctx->canvas = _malloc(ctx->canvas_size);
 983    if (canvas != NULL) {
 984        memcpy(ctx->canvas, canvas, ctx->canvas_size);
 985    } else {
 986        for (size_t i = 0; i < ctx->width * ctx->height; i++) {
 987            ctx->canvas[i] = ctx->default_bg;
 988        }
 989    }
 990#endif
 991
 992    _ctx->raw_putchar = flanterm_fb_raw_putchar;
 993    _ctx->clear = flanterm_fb_clear;
 994    _ctx->set_cursor_pos = flanterm_fb_set_cursor_pos;
 995    _ctx->get_cursor_pos = flanterm_fb_get_cursor_pos;
 996    _ctx->set_text_fg = flanterm_fb_set_text_fg;
 997    _ctx->set_text_bg = flanterm_fb_set_text_bg;
 998    _ctx->set_text_fg_bright = flanterm_fb_set_text_fg_bright;
 999    _ctx->set_text_bg_bright = flanterm_fb_set_text_bg_bright;
1000    _ctx->set_text_fg_rgb = flanterm_fb_set_text_fg_rgb;
1001    _ctx->set_text_bg_rgb = flanterm_fb_set_text_bg_rgb;
1002    _ctx->set_text_fg_default = flanterm_fb_set_text_fg_default;
1003    _ctx->set_text_bg_default = flanterm_fb_set_text_bg_default;
1004    _ctx->set_text_fg_default_bright = flanterm_fb_set_text_fg_default_bright;
1005    _ctx->set_text_bg_default_bright = flanterm_fb_set_text_bg_default_bright;
1006    _ctx->move_character = flanterm_fb_move_character;
1007    _ctx->scroll = flanterm_fb_scroll;
1008    _ctx->revscroll = flanterm_fb_revscroll;
1009    _ctx->swap_palette = flanterm_fb_swap_palette;
1010    _ctx->save_state = flanterm_fb_save_state;
1011    _ctx->restore_state = flanterm_fb_restore_state;
1012    _ctx->double_buffer_flush = flanterm_fb_double_buffer_flush;
1013    _ctx->full_refresh = flanterm_fb_full_refresh;
1014    _ctx->deinit = flanterm_fb_deinit;
1015
1016    flanterm_context_reinit(_ctx);
1017    flanterm_fb_full_refresh(_ctx);
1018
1019    return _ctx;
1020}