backends/fb.c at 9596ebd9f45f5d3fb8d4a60de88724922f5da5fa · pci.express/flanterm.zig

pci.express / flanterm.zig
Fast and reasonably complete (framebuffer) terminal emulator (Zig fork)
flanterm.zig / backends / fb.c
at 9596ebd9f45f5d3fb8d4a60de88724922f5da5fa 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#ifndef FLANTERM_FB_DISABLE_CANVAS
 466        uint32_t *canvas_line = ctx->canvas + x + (y + gy) * ctx->width;
 467#endif
 468        for (size_t fx = 0; fx < ctx->font_width; fx++) {
 469            bool old_draw = old_glyph[fy * ctx->font_width + fx];
 470            bool new_draw = new_glyph[fy * ctx->font_width + fx];
 471            if (old_draw == new_draw)
 472                continue;
 473            for (size_t i = 0; i < ctx->font_scale_x; i++) {
 474                size_t gx = ctx->font_scale_x * fx + i;
 475#ifndef FLANTERM_FB_DISABLE_CANVAS
 476                uint32_t bg = c->bg == 0xffffffff ? canvas_line[gx] : c->bg;
 477                uint32_t fg = c->fg == 0xffffffff ? canvas_line[gx] : c->fg;
 478#else
 479                uint32_t bg = c->bg == 0xffffffff ? default_bg : c->bg;
 480                uint32_t fg = c->fg == 0xffffffff ? default_bg : c->fg;
 481#endif
 482                fb_line[gx] = new_draw ? fg : bg;
 483            }
 484        }
 485    }
 486}
 487
 488static inline bool compare_char(struct flanterm_fb_char *a, struct flanterm_fb_char *b) {
 489    return !(a->c != b->c || a->bg != b->bg || a->fg != b->fg);
 490}
 491
 492static void push_to_queue(struct flanterm_context *_ctx, struct flanterm_fb_char *c, size_t x, size_t y) {
 493    struct flanterm_fb_context *ctx = (void *)_ctx;
 494
 495    if (x >= _ctx->cols || y >= _ctx->rows) {
 496        return;
 497    }
 498
 499    size_t i = y * _ctx->cols + x;
 500
 501    struct flanterm_fb_queue_item *q = ctx->map[i];
 502
 503    if (q == NULL) {
 504        if (compare_char(&ctx->grid[i], c)) {
 505            return;
 506        }
 507        q = &ctx->queue[ctx->queue_i++];
 508        q->x = x;
 509        q->y = y;
 510        ctx->map[i] = q;
 511    }
 512
 513    q->c = *c;
 514}
 515
 516static void flanterm_fb_revscroll(struct flanterm_context *_ctx) {
 517    struct flanterm_fb_context *ctx = (void *)_ctx;
 518
 519    for (size_t i = (_ctx->scroll_bottom_margin - 1) * _ctx->cols - 1;
 520         i >= _ctx->scroll_top_margin * _ctx->cols; i--) {
 521        if (i == (size_t)-1) {
 522            break;
 523        }
 524        struct flanterm_fb_char *c;
 525        struct flanterm_fb_queue_item *q = ctx->map[i];
 526        if (q != NULL) {
 527            c = &q->c;
 528        } else {
 529            c = &ctx->grid[i];
 530        }
 531        push_to_queue(_ctx, c, (i + _ctx->cols) % _ctx->cols, (i + _ctx->cols) / _ctx->cols);
 532    }
 533
 534    // Clear the first line of the screen.
 535    struct flanterm_fb_char empty;
 536    empty.c  = ' ';
 537    empty.fg = ctx->text_fg;
 538    empty.bg = ctx->text_bg;
 539    for (size_t i = 0; i < _ctx->cols; i++) {
 540        push_to_queue(_ctx, &empty, i, _ctx->scroll_top_margin);
 541    }
 542}
 543
 544static void flanterm_fb_scroll(struct flanterm_context *_ctx) {
 545    struct flanterm_fb_context *ctx = (void *)_ctx;
 546
 547    for (size_t i = (_ctx->scroll_top_margin + 1) * _ctx->cols;
 548         i < _ctx->scroll_bottom_margin * _ctx->cols; i++) {
 549        struct flanterm_fb_char *c;
 550        struct flanterm_fb_queue_item *q = ctx->map[i];
 551        if (q != NULL) {
 552            c = &q->c;
 553        } else {
 554            c = &ctx->grid[i];
 555        }
 556        push_to_queue(_ctx, c, (i - _ctx->cols) % _ctx->cols, (i - _ctx->cols) / _ctx->cols);
 557    }
 558
 559    // Clear the last line of the screen.
 560    struct flanterm_fb_char empty;
 561    empty.c  = ' ';
 562    empty.fg = ctx->text_fg;
 563    empty.bg = ctx->text_bg;
 564    for (size_t i = 0; i < _ctx->cols; i++) {
 565        push_to_queue(_ctx, &empty, i, _ctx->scroll_bottom_margin - 1);
 566    }
 567}
 568
 569static void flanterm_fb_clear(struct flanterm_context *_ctx, bool move) {
 570    struct flanterm_fb_context *ctx = (void *)_ctx;
 571
 572    struct flanterm_fb_char empty;
 573    empty.c  = ' ';
 574    empty.fg = ctx->text_fg;
 575    empty.bg = ctx->text_bg;
 576    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
 577        push_to_queue(_ctx, &empty, i % _ctx->cols, i / _ctx->cols);
 578    }
 579
 580    if (move) {
 581        ctx->cursor_x = 0;
 582        ctx->cursor_y = 0;
 583    }
 584}
 585
 586static void flanterm_fb_set_cursor_pos(struct flanterm_context *_ctx, size_t x, size_t y) {
 587    struct flanterm_fb_context *ctx = (void *)_ctx;
 588
 589    if (x >= _ctx->cols) {
 590        if ((int)x < 0) {
 591            x = 0;
 592        } else {
 593            x = _ctx->cols - 1;
 594        }
 595    }
 596    if (y >= _ctx->rows) {
 597        if ((int)y < 0) {
 598            y = 0;
 599        } else {
 600            y = _ctx->rows - 1;
 601        }
 602    }
 603    ctx->cursor_x = x;
 604    ctx->cursor_y = y;
 605}
 606
 607static void flanterm_fb_get_cursor_pos(struct flanterm_context *_ctx, size_t *x, size_t *y) {
 608    struct flanterm_fb_context *ctx = (void *)_ctx;
 609
 610    *x = ctx->cursor_x >= _ctx->cols ? _ctx->cols - 1 : ctx->cursor_x;
 611    *y = ctx->cursor_y >= _ctx->rows ? _ctx->rows - 1 : ctx->cursor_y;
 612}
 613
 614static 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) {
 615    struct flanterm_fb_context *ctx = (void *)_ctx;
 616
 617    if (old_x >= _ctx->cols || old_y >= _ctx->rows
 618     || new_x >= _ctx->cols || new_y >= _ctx->rows) {
 619        return;
 620    }
 621
 622    size_t i = old_x + old_y * _ctx->cols;
 623
 624    struct flanterm_fb_char *c;
 625    struct flanterm_fb_queue_item *q = ctx->map[i];
 626    if (q != NULL) {
 627        c = &q->c;
 628    } else {
 629        c = &ctx->grid[i];
 630    }
 631
 632    push_to_queue(_ctx, c, new_x, new_y);
 633}
 634
 635static void flanterm_fb_set_text_fg(struct flanterm_context *_ctx, size_t fg) {
 636    struct flanterm_fb_context *ctx = (void *)_ctx;
 637
 638    ctx->text_fg = ctx->ansi_colours[fg];
 639}
 640
 641static void flanterm_fb_set_text_bg(struct flanterm_context *_ctx, size_t bg) {
 642    struct flanterm_fb_context *ctx = (void *)_ctx;
 643
 644    ctx->text_bg = ctx->ansi_colours[bg];
 645}
 646
 647static void flanterm_fb_set_text_fg_bright(struct flanterm_context *_ctx, size_t fg) {
 648    struct flanterm_fb_context *ctx = (void *)_ctx;
 649
 650    ctx->text_fg = ctx->ansi_bright_colours[fg];
 651}
 652
 653static void flanterm_fb_set_text_bg_bright(struct flanterm_context *_ctx, size_t bg) {
 654    struct flanterm_fb_context *ctx = (void *)_ctx;
 655
 656    ctx->text_bg = ctx->ansi_bright_colours[bg];
 657}
 658
 659static void flanterm_fb_set_text_fg_rgb(struct flanterm_context *_ctx, uint32_t fg) {
 660    struct flanterm_fb_context *ctx = (void *)_ctx;
 661
 662    ctx->text_fg = fg;
 663}
 664
 665static void flanterm_fb_set_text_bg_rgb(struct flanterm_context *_ctx, uint32_t bg) {
 666    struct flanterm_fb_context *ctx = (void *)_ctx;
 667
 668    ctx->text_bg = bg;
 669}
 670
 671static void flanterm_fb_set_text_fg_default(struct flanterm_context *_ctx) {
 672    struct flanterm_fb_context *ctx = (void *)_ctx;
 673
 674    ctx->text_fg = ctx->default_fg;
 675}
 676
 677static void flanterm_fb_set_text_bg_default(struct flanterm_context *_ctx) {
 678    struct flanterm_fb_context *ctx = (void *)_ctx;
 679
 680    ctx->text_bg = 0xffffffff;
 681}
 682
 683static void flanterm_fb_set_text_fg_default_bright(struct flanterm_context *_ctx) {
 684    struct flanterm_fb_context *ctx = (void *)_ctx;
 685
 686    ctx->text_fg = ctx->default_fg_bright;
 687}
 688
 689static void flanterm_fb_set_text_bg_default_bright(struct flanterm_context *_ctx) {
 690    struct flanterm_fb_context *ctx = (void *)_ctx;
 691
 692    ctx->text_bg = ctx->default_bg_bright;
 693}
 694
 695static void draw_cursor(struct flanterm_context *_ctx) {
 696    struct flanterm_fb_context *ctx = (void *)_ctx;
 697
 698    if (ctx->cursor_x >= _ctx->cols || ctx->cursor_y >= _ctx->rows) {
 699        return;
 700    }
 701
 702    size_t i = ctx->cursor_x + ctx->cursor_y * _ctx->cols;
 703
 704    struct flanterm_fb_char c;
 705    struct flanterm_fb_queue_item *q = ctx->map[i];
 706    if (q != NULL) {
 707        c = q->c;
 708    } else {
 709        c = ctx->grid[i];
 710    }
 711    uint32_t tmp = c.fg;
 712    c.fg = c.bg;
 713    c.bg = tmp;
 714    plot_char(_ctx, &c, ctx->cursor_x, ctx->cursor_y);
 715    if (q != NULL) {
 716        ctx->grid[i] = q->c;
 717        ctx->map[i] = NULL;
 718    }
 719}
 720
 721static void flanterm_fb_double_buffer_flush(struct flanterm_context *_ctx) {
 722    struct flanterm_fb_context *ctx = (void *)_ctx;
 723
 724    if (_ctx->cursor_enabled) {
 725        draw_cursor(_ctx);
 726    }
 727
 728    for (size_t i = 0; i < ctx->queue_i; i++) {
 729        struct flanterm_fb_queue_item *q = &ctx->queue[i];
 730        size_t offset = q->y * _ctx->cols + q->x;
 731        if (ctx->map[offset] == NULL) {
 732            continue;
 733        }
 734        struct flanterm_fb_char *old = &ctx->grid[offset];
 735        if (q->c.bg == old->bg && q->c.fg == old->fg) {
 736            plot_char_fast(_ctx, old, &q->c, q->x, q->y);
 737        } else {
 738            plot_char(_ctx, &q->c, q->x, q->y);
 739        }
 740        ctx->grid[offset] = q->c;
 741        ctx->map[offset] = NULL;
 742    }
 743
 744    if ((ctx->old_cursor_x != ctx->cursor_x || ctx->old_cursor_y != ctx->cursor_y) || _ctx->cursor_enabled == false) {
 745        if (ctx->old_cursor_x < _ctx->cols && ctx->old_cursor_y < _ctx->rows) {
 746            plot_char(_ctx, &ctx->grid[ctx->old_cursor_x + ctx->old_cursor_y * _ctx->cols], ctx->old_cursor_x, ctx->old_cursor_y);
 747        }
 748    }
 749
 750    ctx->old_cursor_x = ctx->cursor_x;
 751    ctx->old_cursor_y = ctx->cursor_y;
 752
 753    ctx->queue_i = 0;
 754}
 755
 756static void flanterm_fb_raw_putchar(struct flanterm_context *_ctx, uint8_t c) {
 757    struct flanterm_fb_context *ctx = (void *)_ctx;
 758
 759    if (ctx->cursor_x >= _ctx->cols && (ctx->cursor_y < _ctx->scroll_bottom_margin - 1 || _ctx->scroll_enabled)) {
 760        ctx->cursor_x = 0;
 761        ctx->cursor_y++;
 762        if (ctx->cursor_y == _ctx->scroll_bottom_margin) {
 763            ctx->cursor_y--;
 764            flanterm_fb_scroll(_ctx);
 765        }
 766        if (ctx->cursor_y >= _ctx->cols) {
 767            ctx->cursor_y = _ctx->cols - 1;
 768        }
 769    }
 770
 771    struct flanterm_fb_char ch;
 772    ch.c  = c;
 773    ch.fg = ctx->text_fg;
 774    ch.bg = ctx->text_bg;
 775    push_to_queue(_ctx, &ch, ctx->cursor_x++, ctx->cursor_y);
 776}
 777
 778static void flanterm_fb_full_refresh(struct flanterm_context *_ctx) {
 779    struct flanterm_fb_context *ctx = (void *)_ctx;
 780
 781#ifdef FLANTERM_FB_DISABLE_CANVAS
 782    uint32_t default_bg = ctx->default_bg;
 783#endif
 784
 785    for (size_t y = 0; y < ctx->height; y++) {
 786        for (size_t x = 0; x < ctx->width; x++) {
 787#ifndef FLANTERM_FB_DISABLE_CANVAS
 788            ctx->framebuffer[y * (ctx->pitch / sizeof(uint32_t)) + x] = ctx->canvas[y * ctx->width + x];
 789#else
 790            ctx->framebuffer[y * (ctx->pitch / sizeof(uint32_t)) + x] = default_bg;
 791#endif
 792        }
 793    }
 794
 795    for (size_t i = 0; i < (size_t)_ctx->rows * _ctx->cols; i++) {
 796        size_t x = i % _ctx->cols;
 797        size_t y = i / _ctx->cols;
 798
 799        plot_char(_ctx, &ctx->grid[i], x, y);
 800    }
 801
 802    if (_ctx->cursor_enabled) {
 803        draw_cursor(_ctx);
 804    }
 805}
 806
 807static void flanterm_fb_deinit(struct flanterm_context *_ctx, void (*_free)(void *, size_t)) {
 808    struct flanterm_fb_context *ctx = (void *)_ctx;
 809
 810    _free(ctx->font_bits, ctx->font_bits_size);
 811    _free(ctx->font_bool, ctx->font_bool_size);
 812    _free(ctx->grid, ctx->grid_size);
 813    _free(ctx->queue, ctx->queue_size);
 814    _free(ctx->map, ctx->map_size);
 815
 816#ifndef FLANTERM_FB_DISABLE_CANVAS
 817    _free(ctx->canvas, ctx->canvas_size);
 818#endif
 819
 820    _free(ctx, sizeof(struct flanterm_fb_context));
 821}
 822
 823struct flanterm_context *flanterm_fb_init(
 824    void *(*_malloc)(size_t),
 825    uint32_t *framebuffer, size_t width, size_t height, size_t pitch,
 826#ifndef FLANTERM_FB_DISABLE_CANVAS
 827    uint32_t *canvas,
 828#endif
 829    uint32_t *ansi_colours, uint32_t *ansi_bright_colours,
 830    uint32_t *default_bg, uint32_t *default_fg,
 831    uint32_t *default_bg_bright, uint32_t *default_fg_bright,
 832    void *font, size_t font_width, size_t font_height, size_t font_spacing,
 833    size_t font_scale_x, size_t font_scale_y,
 834    size_t margin
 835) {
 836    struct flanterm_fb_context *ctx = _malloc(sizeof(struct flanterm_fb_context));
 837
 838    struct flanterm_context *_ctx = (void *)ctx;
 839
 840    memset(ctx, 0, sizeof(struct flanterm_fb_context));
 841
 842    if (ansi_colours != NULL) {
 843        memcpy(ctx->ansi_colours, ansi_colours, sizeof(ctx->ansi_colours));
 844    } else {
 845        ctx->ansi_colours[0] = 0x00000000; // black
 846        ctx->ansi_colours[1] = 0x00aa0000; // red
 847        ctx->ansi_colours[2] = 0x0000aa00; // green
 848        ctx->ansi_colours[3] = 0x00aa5500; // brown
 849        ctx->ansi_colours[4] = 0x000000aa; // blue
 850        ctx->ansi_colours[5] = 0x00aa00aa; // magenta
 851        ctx->ansi_colours[6] = 0x0000aaaa; // cyan
 852        ctx->ansi_colours[7] = 0x00aaaaaa; // grey
 853    }
 854
 855    if (ansi_bright_colours != NULL) {
 856        memcpy(ctx->ansi_bright_colours, ansi_bright_colours, sizeof(ctx->ansi_bright_colours));
 857    } else {
 858        ctx->ansi_bright_colours[0] = 0x00555555; // black
 859        ctx->ansi_bright_colours[1] = 0x00ff5555; // red
 860        ctx->ansi_bright_colours[2] = 0x0055ff55; // green
 861        ctx->ansi_bright_colours[3] = 0x00ffff55; // brown
 862        ctx->ansi_bright_colours[4] = 0x005555ff; // blue
 863        ctx->ansi_bright_colours[5] = 0x00ff55ff; // magenta
 864        ctx->ansi_bright_colours[6] = 0x0055ffff; // cyan
 865        ctx->ansi_bright_colours[7] = 0x00ffffff; // grey
 866    }
 867
 868    if (default_bg != NULL) {
 869        ctx->default_bg = *default_bg;
 870    } else {
 871        ctx->default_bg = 0x00000000; // background (black)
 872    }
 873
 874    if (default_fg != NULL) {
 875        ctx->default_fg = *default_fg;
 876    } else {
 877        ctx->default_fg = 0x00aaaaaa; // foreground (grey)
 878    }
 879
 880    if (default_bg_bright != NULL) {
 881        ctx->default_bg_bright = *default_bg_bright;
 882    } else {
 883        ctx->default_bg_bright = 0x00555555; // background (black)
 884    }
 885
 886    if (default_fg_bright != NULL) {
 887        ctx->default_fg_bright = *default_fg_bright;
 888    } else {
 889        ctx->default_fg_bright = 0x00ffffff; // foreground (grey)
 890    }
 891
 892    ctx->text_fg = ctx->default_fg;
 893    ctx->text_bg = 0xffffffff;
 894
 895    ctx->framebuffer = (void *)framebuffer;
 896    ctx->width = width;
 897    ctx->height = height;
 898    ctx->pitch = pitch;
 899
 900#define FONT_BYTES ((font_width * font_height * FLANTERM_FB_FONT_GLYPHS) / 8)
 901
 902    if (font != NULL) {
 903        ctx->font_width = font_width;
 904        ctx->font_height = font_height;
 905        ctx->font_bits = _malloc(FONT_BYTES);
 906        memcpy(ctx->font_bits, font, FONT_BYTES);
 907    } else {
 908        ctx->font_width = font_width = 8;
 909        ctx->font_height = font_height = 16;
 910        font_spacing = 1;
 911        ctx->font_bits = _malloc(FONT_BYTES);
 912        memcpy(ctx->font_bits, builtin_font, FONT_BYTES);
 913    }
 914
 915    ctx->font_bits_size = FONT_BYTES;
 916
 917#undef FONT_BYTES
 918
 919    ctx->font_width += font_spacing;
 920
 921    ctx->font_bool_size = FLANTERM_FB_FONT_GLYPHS * font_height * ctx->font_width * sizeof(bool);
 922    ctx->font_bool = _malloc(ctx->font_bool_size);
 923
 924    for (size_t i = 0; i < FLANTERM_FB_FONT_GLYPHS; i++) {
 925        uint8_t *glyph = &ctx->font_bits[i * font_height];
 926
 927        for (size_t y = 0; y < font_height; y++) {
 928            // NOTE: the characters in VGA fonts are always one byte wide.
 929            // 9 dot wide fonts have 8 dots and one empty column, except
 930            // characters 0xC0-0xDF replicate column 9.
 931            for (size_t x = 0; x < 8; x++) {
 932                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;
 933
 934                if ((glyph[y] & (0x80 >> x))) {
 935                    ctx->font_bool[offset] = true;
 936                } else {
 937                    ctx->font_bool[offset] = false;
 938                }
 939            }
 940            // fill columns above 8 like VGA Line Graphics Mode does
 941            for (size_t x = 8; x < ctx->font_width; x++) {
 942                size_t offset = i * font_height * ctx->font_width + y * ctx->font_width + x;
 943
 944                if (i >= 0xc0 && i <= 0xdf) {
 945                    ctx->font_bool[offset] = (glyph[y] & 1);
 946                } else {
 947                    ctx->font_bool[offset] = false;
 948                }
 949            }
 950        }
 951    }
 952
 953    ctx->font_scale_x = font_scale_x;
 954    ctx->font_scale_y = font_scale_y;
 955
 956    ctx->glyph_width = ctx->font_width * font_scale_x;
 957    ctx->glyph_height = font_height * font_scale_y;
 958
 959    _ctx->cols = (ctx->width - margin * 2) / ctx->glyph_width;
 960    _ctx->rows = (ctx->height - margin * 2) / ctx->glyph_height;
 961
 962    ctx->offset_x = margin + ((ctx->width - margin * 2) % ctx->glyph_width) / 2;
 963    ctx->offset_y = margin + ((ctx->height - margin * 2) % ctx->glyph_height) / 2;
 964
 965    ctx->grid_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_char);
 966    ctx->grid = _malloc(ctx->grid_size);
 967    for (size_t i = 0; i < _ctx->rows * _ctx->cols; i++) {
 968        ctx->grid[i].c = ' ';
 969        ctx->grid[i].fg = ctx->text_fg;
 970        ctx->grid[i].bg = ctx->text_bg;
 971    }
 972
 973    ctx->queue_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_queue_item);
 974    ctx->queue = _malloc(ctx->queue_size);
 975    ctx->queue_i = 0;
 976    memset(ctx->queue, 0, ctx->queue_size);
 977
 978    ctx->map_size = _ctx->rows * _ctx->cols * sizeof(struct flanterm_fb_queue_item *);
 979    ctx->map = _malloc(ctx->map_size);
 980    memset(ctx->map, 0, ctx->map_size);
 981
 982#ifndef FLANTERM_FB_DISABLE_CANVAS
 983    ctx->canvas_size = ctx->width * ctx->height * sizeof(uint32_t);
 984    ctx->canvas = _malloc(ctx->canvas_size);
 985    if (canvas != NULL) {
 986        memcpy(ctx->canvas, canvas, ctx->canvas_size);
 987    } else {
 988        for (size_t i = 0; i < ctx->width * ctx->height; i++) {
 989            ctx->canvas[i] = ctx->default_bg;
 990        }
 991    }
 992#endif
 993
 994    _ctx->raw_putchar = flanterm_fb_raw_putchar;
 995    _ctx->clear = flanterm_fb_clear;
 996    _ctx->set_cursor_pos = flanterm_fb_set_cursor_pos;
 997    _ctx->get_cursor_pos = flanterm_fb_get_cursor_pos;
 998    _ctx->set_text_fg = flanterm_fb_set_text_fg;
 999    _ctx->set_text_bg = flanterm_fb_set_text_bg;
1000    _ctx->set_text_fg_bright = flanterm_fb_set_text_fg_bright;
1001    _ctx->set_text_bg_bright = flanterm_fb_set_text_bg_bright;
1002    _ctx->set_text_fg_rgb = flanterm_fb_set_text_fg_rgb;
1003    _ctx->set_text_bg_rgb = flanterm_fb_set_text_bg_rgb;
1004    _ctx->set_text_fg_default = flanterm_fb_set_text_fg_default;
1005    _ctx->set_text_bg_default = flanterm_fb_set_text_bg_default;
1006    _ctx->set_text_fg_default_bright = flanterm_fb_set_text_fg_default_bright;
1007    _ctx->set_text_bg_default_bright = flanterm_fb_set_text_bg_default_bright;
1008    _ctx->move_character = flanterm_fb_move_character;
1009    _ctx->scroll = flanterm_fb_scroll;
1010    _ctx->revscroll = flanterm_fb_revscroll;
1011    _ctx->swap_palette = flanterm_fb_swap_palette;
1012    _ctx->save_state = flanterm_fb_save_state;
1013    _ctx->restore_state = flanterm_fb_restore_state;
1014    _ctx->double_buffer_flush = flanterm_fb_double_buffer_flush;
1015    _ctx->full_refresh = flanterm_fb_full_refresh;
1016    _ctx->deinit = flanterm_fb_deinit;
1017
1018    flanterm_context_reinit(_ctx);
1019    flanterm_fb_full_refresh(_ctx);
1020
1021    return _ctx;
1022}