1 // Copyright 2016 The Fuchsia Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #pragma once
6
7 #include <stddef.h>
8 #include <stdint.h>
9
10 #define TC_MAX_ARG 16
11 #define TC_MAX_ARG_LENGTH 8 // matches vc title length
12
13 typedef struct textcon textcon_t;
14 typedef uint16_t vc_char_t;
15
vc_char_make(uint8_t ch,uint8_t fg_color,uint8_t bg_color)16 inline vc_char_t vc_char_make(uint8_t ch, uint8_t fg_color, uint8_t bg_color) {
17 return static_cast<vc_char_t>(ch | ((fg_color & 0xf) << 8)
18 | ((bg_color & 0xf) << 12));
19 }
20
vc_char_get_char(vc_char_t ch)21 inline uint8_t vc_char_get_char(vc_char_t ch) {
22 return static_cast<uint8_t>(ch & 0xff);
23 }
24
vc_char_get_fg_color(vc_char_t ch)25 inline uint8_t vc_char_get_fg_color(vc_char_t ch) {
26 return static_cast<uint8_t>((ch >> 8) & 0xf);
27 }
28
vc_char_get_bg_color(vc_char_t ch)29 inline uint8_t vc_char_get_bg_color(vc_char_t ch) {
30 return static_cast<uint8_t>((ch >> 12) & 0xf);
31 }
32
33 typedef enum textcon_param {
34 TC_INVALID,
35 TC_SET_TITLE,
36 TC_SHOW_CURSOR,
37 TC_HIDE_CURSOR,
38 } textcon_param_t;
39
40 struct textcon {
41 void (*putc)(textcon_t* tc, uint8_t c);
42
43 // backing data
44 vc_char_t* data;
45
46 // dimensions of display
47 int w;
48 int h;
49
50 // cursor position
51 int x; // 0 < x <= w; cursor may be one position beyond right edge
52 int y; // 0 < y < h
53
54 // callbacks to update visible display
55 void (*invalidate)(void* cookie, int x, int y, int w, int h);
56 void (*movecursor)(void* cookie, int x, int y);
57 void (*push_scrollback_line)(void* cookie, int y);
58 void (*copy_lines)(void* cookie, int y_dest, int y_src, int count);
59 void (*setparam)(void* cookie, int param, uint8_t* arg, size_t arglen);
60 void* cookie;
61
62 // scrolling region
63 int scroll_y0;
64 int scroll_y1;
65
66 // saved cursor position
67 int save_x;
68 int save_y;
69
70 uint8_t fg;
71 uint8_t bg;
72
73 // Escape sequence parameter parsing
74 // Numeric arguments
75 int num; // Argument currently being read
76 int argn_count; // Number of arguments read into argn[]
77 int argn[TC_MAX_ARG];
78 // String argument (e.g. for console title)
79 int argstr_size; // Number of characters read into argstr[]
80 uint8_t argstr[TC_MAX_ARG_LENGTH + 1];
81 };
82
83 void tc_init(textcon_t* tc, int w, int h, vc_char_t* data,
84 uint8_t fg, uint8_t bg, int cursor_x, int cursor_y);
85
86 void tc_copy_lines(textcon_t* tc, int y_dest, int y_src, int line_count);
87
tc_putc(textcon_t * tc,uint8_t c)88 static inline void tc_putc(textcon_t* tc, uint8_t c) {
89 tc->putc(tc, c);
90 }
91
92 void tc_seth(textcon_t* tc, int h);
93