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/* This file provides a termbox2-based backend for the Vis editor's terminal UI.
* It is designed to be included from ui-terminal.c in place of ui-terminal-vt100.c
* or ui-terminal-curses.c. Compile with termbox2 linked and define necessary
* options like TB_OPT_ATTR_W=32 for truecolor support if desired.
*
* Focus is on portability, simplicity, and performance. We leverage termbox2's
* double-buffering to eliminate flicker while keeping overhead low. Color
* handling falls back gracefully from truecolor to 256 or 8 colors based on
* terminal capabilities.
*
* Cells are inspected properly for content; empty data uses space. Colors map
* from Vis CellColor (index or RGB) to termbox attrs, with approximation for
* reduced palettes.
*/
#define TB_OPT_V1_COMPAT
#define TB_IMPL
#include "termbox2.h"
#define TB_OUTPUT_TRUECOLOR 1
#define CELL_COLOR_BLACK { .index = 0 }
#define CELL_COLOR_RED { .index = 1 }
#define CELL_COLOR_GREEN { .index = 2 }
#define CELL_COLOR_YELLOW { .index = 3 }
#define CELL_COLOR_BLUE { .index = 4 }
#define CELL_COLOR_MAGENTA { .index = 5 }
#define CELL_COLOR_CYAN { .index = 6 }
#define CELL_COLOR_WHITE { .index = 7 }
#define CELL_COLOR_DEFAULT { .index = 9 }
#define CELL_ATTR_NORMAL 0
#define CELL_ATTR_UNDERLINE (1 << 0)
#define CELL_ATTR_REVERSE (1 << 1)
#define CELL_ATTR_BLINK (1 << 2)
#define CELL_ATTR_BOLD (1 << 3)
#define CELL_ATTR_ITALIC (1 << 4)
#define CELL_ATTR_DIM (1 << 5)
#define UI_TERMKEY_FLAGS TERMKEY_FLAG_UTF8|TERMKEY_FLAG_NOTERMIOS
static int output_mode;
static const unsigned char color_256_to_16[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
};
static void get_6cube_rgb(unsigned int n, int *r, int *g, int *b) {
if (n < 16) {
return;
} else if (n < 232) {
n -= 16;
*r = (n / 36) ? (n / 36) * 40 + 55 : 0;
*g = ((n / 6) % 6) ? ((n / 6) % 6) * 40 + 55 : 0;
*b = (n % 6) ? (n % 6) * 40 + 55 : 0;
} else if (n < 256) {
n -= 232;
*r = n * 10 + 8;
*g = n * 10 + 8;
*b = n * 10 + 8;
}
}
static inline bool cell_color_equal(CellColor c1, CellColor c2) {
if (c1.index != (uint8_t)-1 || c2.index != (uint8_t)-1)
return c1.index == c2.index;
return c1.r == c2.r && c1.g == c2.g && c1.b == c2.b;
}
static CellColor color_rgb(Ui *ui, uint8_t r, uint8_t g, uint8_t b) {
return (CellColor){ .r = r, .g = g, .b = b, .index = (uint8_t)-1 };
}
static CellColor color_terminal(Ui *ui, uint8_t index) {
return (CellColor){ .r = 0, .g = 0, .b = 0, .index = index };
}
static uintattr_t get_tb_attr(CellAttr a) {
uintattr_t ret = 0;
if (a & CELL_ATTR_BOLD) ret |= TB_BOLD;
if (a & CELL_ATTR_UNDERLINE) ret |= TB_UNDERLINE;
if (a & CELL_ATTR_REVERSE) ret |= TB_REVERSE;
if (a & CELL_ATTR_BLINK) ret |= TB_BLINK;
if (a & CELL_ATTR_ITALIC) ret |= TB_ITALIC;
if (a & CELL_ATTR_DIM) ret |= TB_DIM;
return ret;
}
static uintattr_t get_tb_color(CellColor c) {
int mode = output_mode;
int r, g, b;
if (c.index != (uint8_t)-1) {
if (c.index == 9) return TB_DEFAULT;
static const int ansi_r[8] = {0, 128, 0, 128, 0, 128, 0, 192};
static const int ansi_g[8] = {0, 0, 128, 128, 0, 0, 128, 192};
static const int ansi_b[8] = {0, 0, 0, 0, 128, 128, 128, 192};
r = ansi_r[c.index];
g = ansi_g[c.index];
b = ansi_b[c.index];
} else {
r = c.r; g = c.g; b = c.b;
}
if (mode == TB_OUTPUT_TRUECOLOR) {
return (r << 16) | (g << 8) | b;
}
// Approximate to 256-color index
int i = 0;
if ((!r || (r - 55) % 40 == 0) &&
(!g || (g - 55) % 40 == 0) &&
(!b || (b - 55) % 40 == 0)) {
i = 16;
i += r ? ((r - 55) / 40) * 36 : 0;
i += g ? ((g - 55) / 40) * 6 : 0;
i += b ? ((b - 55) / 40) : 0;
} else if (r == g && g == b && (r - 8) % 10 == 0 && r < 239) {
i = 232 + ((r - 8) / 10);
} else {
unsigned lowest = UINT_MAX;
for (int j = 16; j < 256; ++j) {
int jr, jg, jb;
get_6cube_rgb(j, &jr, &jg, &jb);
int dr = jr - r, dg = jg - g, db = jb - b;
unsigned distance = dr * dr + dg * dg + db * db;
if (distance < lowest) {
lowest = distance;
i = j;
}
}
}
if (mode == TB_OUTPUT_256) {
return i;
} else { // TB_OUTPUT_NORMAL
int idx16 = color_256_to_16[i];
if (idx16 == 0) return TB_BLACK; // Treat as black for non-default
if (idx16 < 8) return idx16 + 1;
return (idx16 - 8 + 1) | TB_BRIGHT;
}
}
static void ui_term_backend_blit(Ui *tui) {
int w = tui->width, h = tui->height;
Cell *cell = tui->cells;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
uint32_t ch = ' ';
tb_utf8_char_to_unicode(&ch, cell->data);
uintattr_t fg = get_tb_color(cell->style.fg) | get_tb_attr(cell->style.attr);
uintattr_t bg = get_tb_color(cell->style.bg);
tb_change_cell(x, y, ch, fg, bg);
cell++;
}
}
tb_present();
}
static void ui_term_backend_clear(Ui *tui) {
tb_clear();
}
static bool ui_term_backend_resize(Ui *tui, int width, int height) {
return true; // termbox2 handles resize internally
}
static void ui_term_backend_save(Ui *tui, bool fscr) {
tb_shutdown();
}
static void ui_term_backend_restore(Ui *tui) {
tb_init();
tb_select_output_mode(output_mode);
tb_hide_cursor();
tb_clear();
}
int ui_terminal_colors(void) {
switch (output_mode) {
case TB_OUTPUT_TRUECOLOR: return 16777216;
case TB_OUTPUT_256: return 256;
default: return 16;
}
}
static bool ui_term_backend_init(Ui *tui, char *term) {
if (tb_init() < 0) return false;
output_mode = tb_select_output_mode(TB_OUTPUT_TRUECOLOR);
if (output_mode != TB_OUTPUT_TRUECOLOR)
output_mode = tb_select_output_mode(TB_OUTPUT_256);
if (output_mode != TB_OUTPUT_256)
output_mode = TB_OUTPUT_NORMAL;
tb_hide_cursor();
return true;
}
static bool ui_backend_init(Ui *ui) {
return true;
}
void ui_terminal_resume(Ui *term) { }
static void ui_term_backend_suspend(Ui *tui) { }
static void ui_term_backend_free(Ui *tui) {
tb_shutdown();
}
static bool is_default_color(CellColor c) {
return c.index == ((CellColor) CELL_COLOR_DEFAULT).index;
}
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