git.gag.com Git - fw/altos/blob - src/drivers/ao_console.c

   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao.h"
  16 #include "ao_console.h"
  17 #include "ao_ps2.h"
  18 #include "ao_vga.h"
  19
  20 static uint8_t  console_row, console_col;
  21
  22 #define ao_console_bitmap       ao_vga_bitmap
  23
  24 static uint8_t  console_rows, console_cols;
  25
  26 static void
  27 ao_console_scroll(void)
  28 {
  29         ao_copy(&ao_console_bitmap,
  30                 0, 0,
  31                 ao_console_bitmap.width,
  32                 ao_console_bitmap.height - ao_font.height,
  33                 &ao_console_bitmap,
  34                 0, ao_font.height,
  35                 AO_COPY);
  36         ao_rect(&ao_console_bitmap,
  37                 0,
  38                 (console_rows - 1) * ao_font.height,
  39                 ao_console_bitmap.width,
  40                 ao_font.height,
  41                 1,
  42                 AO_COPY);
  43 }
  44
  45 static void
  46 ao_console_cursor(void)
  47 {
  48         ao_rect(&ao_console_bitmap,
  49                 console_col * ao_font.width,
  50                 console_row * ao_font.height,
  51                 ao_font.width,
  52                 ao_font.height,
  53                 1,
  54                 AO_XOR);
  55 }
  56
  57 static void
  58 ao_console_clear(void)
  59 {
  60         ao_rect(&ao_console_bitmap,
  61                 0, 0,
  62                 ao_console_bitmap.width,
  63                 ao_console_bitmap.height,
  64                 1,
  65                 AO_COPY);
  66 }
  67
  68 static void
  69 ao_console_space(void)
  70 {
  71         ao_rect(&ao_console_bitmap,
  72                 console_col * ao_font.width,
  73                 console_row * ao_font.height,
  74                 ao_font.width,
  75                 ao_font.height,
  76                 1,
  77                 AO_COPY);
  78 }
  79
  80 static void
  81 ao_console_newline(void)
  82 {
  83         if (++console_row == console_rows) {
  84                 ao_console_scroll();
  85                 console_row--;
  86         }
  87 }
  88
  89 void
  90 ao_console_putchar(char c)
  91 {
  92         if (' ' <= c && c < 0x7f) {
  93                 char    text[2];
  94                 ao_console_space();
  95                 text[0] = c;
  96                 text[1] = '\0';
  97                 ao_text(&ao_console_bitmap,
  98                         console_col * ao_font.width,
  99                         console_row * ao_font.height + ao_font.ascent,
 100                         text,
 101                         0,
 102                         AO_COPY);
 103                 if (++console_col == console_cols) {
 104                         console_col = 0;
 105                         ao_console_newline();
 106                 }
 107         } else {
 108                 ao_console_cursor();
 109                 switch (c) {
 110                 case '\r':
 111                         console_col = 0;
 112                         break;
 113                 case '\t':
 114                         console_col += 8 - (console_col & 7);
 115                         if (console_col >= console_cols) {
 116                                 console_col = 0;
 117                                 ao_console_newline();
 118                         }
 119                         break;
 120                 case '\n':
 121                         ao_console_newline();
 122                         break;
 123                 case '\f':
 124                         console_col = console_row = 0;
 125                         ao_console_clear();
 126                         break;
 127                 case '\177':
 128                 case '\010':
 129                         if (console_col)
 130                                 console_col--;
 131                         break;
 132                 }
 133         }
 134         ao_console_cursor();
 135 }
 136
 137 void
 138 ao_console_init(void)
 139 {
 140         console_cols = ao_console_bitmap.width / ao_font.width;
 141         console_rows = ao_console_bitmap.height / ao_font.height;
 142 #if CONSOLE_STDIN
 143         ao_ps2_stdin = 1;
 144         ao_add_stdio(_ao_ps2_pollchar,
 145                      ao_console_putchar,
 146                      NULL);
 147 #endif
 148         ao_console_clear();
 149         ao_console_cursor();
 150         ao_vga_enable(1);
 151 }