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foot/terminal.c
Daniel Eklöf 36ef0463b7
term: use logical DPI+scale factor when scaling fonts 
This fixes an issue where the fonts were rendered too small when the
output had fractional scaling.

For integral scaling, using the logical (scaled) DPI multiplied with
the scaling factor results in the same final DPI value as if we had
used the physical DPI.

But for fractional scaling, this works around the fact that the
compositor downscales the surface after we've rendered it.

Closes #5
2020-03-14 22:34:03 +01:00

2165 lines
60 KiB
C
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#include "terminal.h"
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/timerfd.h>
#include <fcntl.h>
#include <linux/input-event-codes.h>
#define LOG_MODULE "terminal"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "async.h"
#include "config.h"
#include "grid.h"
#include "quirks.h"
#include "render.h"
#include "selection.h"
#include "sixel.h"
#include "slave.h"
#include "vt.h"
#define ALEN(v) (sizeof(v) / sizeof(v[0]))
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))
static const char *const XCURSOR_LEFT_PTR = "left_ptr";
static const char *const XCURSOR_TEXT = "text";
static const char *const XCURSOR_HAND2 = "hand2";
bool
term_to_slave(struct terminal *term, const void *_data, size_t len)
{
if (term->ptmx < 0) {
/* We're probably in "hold" */
return false;
}
size_t async_idx = 0;
if (tll_length(term->ptmx_buffer) > 0) {
/* With a non-empty queue, EPOLLOUT has already been enabled */
goto enqueue_data;
}
/*
* Try a synchronous write first. If we fail to write everything,
* switch to asynchronous.
*/
switch (async_write(term->ptmx, _data, len, &async_idx)) {
case ASYNC_WRITE_REMAIN:
/* Switch to asynchronous mode; let FDM write the remaining data */
if (!fdm_event_add(term->fdm, term->ptmx, EPOLLOUT))
return false;
goto enqueue_data;
case ASYNC_WRITE_DONE:
return true;
case ASYNC_WRITE_ERR:
LOG_ERRNO("failed to synchronously write %zu bytes to slave", len);
return false;
}
/* Shouldn't get here */
assert(false);
return false;
enqueue_data:
/*
* We're in asynchronous mode - push data to queue and let the FDM
* handler take care of it
*/
{
void *copy = malloc(len);
memcpy(copy, _data, len);
struct ptmx_buffer queued = {
.data = copy,
.len = len,
.idx = async_idx,
};
tll_push_back(term->ptmx_buffer, queued);
}
return true;
}
static bool
fdm_ptmx_out(struct fdm *fdm, int fd, int events, void *data)
{
struct terminal *term = data;
/* If there is no queued data, then we shouldn't be in asynchronous mode */
assert(tll_length(term->ptmx_buffer) > 0);
/* Don't use pop() since we may not be able to write the entire buffer */
tll_foreach(term->ptmx_buffer, it) {
switch (async_write(term->ptmx, it->item.data, it->item.len, &it->item.idx)) {
case ASYNC_WRITE_DONE:
free(it->item.data);
tll_remove(term->ptmx_buffer, it);
break;
case ASYNC_WRITE_REMAIN:
/* to_slave() updated it->item.idx */
return true;
case ASYNC_WRITE_ERR:
LOG_ERRNO("failed to asynchronously write %zu bytes to slave",
it->item.len - it->item.idx);
return false;
}
}
/* No more queued data, switch back to synchronous mode */
fdm_event_del(term->fdm, term->ptmx, EPOLLOUT);
return true;
}
#define PTMX_TIMING 0
#if PTMX_TIMING
static struct timespec last = {0};
#endif
static bool
fdm_ptmx(struct fdm *fdm, int fd, int events, void *data)
{
struct terminal *term = data;
const bool pollin = events & EPOLLIN;
const bool pollout = events & EPOLLOUT;
const bool hup = events & EPOLLHUP;
if (pollout) {
if (!fdm_ptmx_out(fdm, fd, events, data))
return false;
}
#if 0
if (!pollin)
return true;
#endif
/* Prevent blinking while typing */
term_cursor_blink_restart(term);
uint8_t buf[24 * 1024];
ssize_t count = sizeof(buf);
const size_t max_iterations = 10;
for (size_t i = 0; i < max_iterations && pollin && count == sizeof(buf); i++) {
assert(pollin);
count = read(term->ptmx, buf, sizeof(buf));
if (count < 0) {
LOG_ERRNO("failed to read from pseudo terminal");
return false;
}
vt_from_slave(term, buf, count);
}
/*
* We likely need to re-render. But, we don't want to do it
* immediately. Often, a single client update is done through
* multiple writes. This could lead to us rendering one frame with
* "intermediate" state.
*
* For example, we might end up rendering a frame
* where the client just erased a line, while in the
* next frame, the client wrote to the same line. This
* causes screen "flickering".
*
* Mitigate by always incuring a small delay before
* rendering the next frame. This gives the client
* some time to finish the operation (and thus gives
* us time to receive the last writes before doing any
* actual rendering).
*
* We incur this delay *every* time we receive
* input. To ensure we don't delay rendering
* indefinitely, we start a second timer that is only
* reset when we render.
*
* Note that when the client is producing data at a
* very high pace, we're rate limited by the wayland
* compositor anyway. The delay we introduce here only
* has any effect when the renderer is idle.
*/
if (term->window->frame_callback == NULL) {
if (term->render.app_sync_updates.enabled)
term->render.refresh.grid = true;
else {
/* First timeout - reset each time we receive input. */
#if PTMX_TIMING
struct timespec now;
clock_gettime(1, &now);
if (last.tv_sec > 0 || last.tv_nsec > 0) {
struct timeval diff;
struct timeval l = {last.tv_sec, last.tv_nsec / 1000};
struct timeval n = {now.tv_sec, now.tv_nsec / 1000};
timersub(&n, &l, &diff);
LOG_INFO("waited %lu µs for more input", diff.tv_usec);
}
last = now;
#endif
timerfd_settime(
term->delayed_render_timer.lower_fd, 0,
&(struct itimerspec){.it_value = {.tv_nsec = 500000}},
NULL);
/* Second timeout - only reset when we render. Set to one
* frame (assuming 60Hz) */
if (!term->delayed_render_timer.is_armed) {
timerfd_settime(
term->delayed_render_timer.upper_fd, 0,
&(struct itimerspec){.it_value = {.tv_nsec = 16666666 / 2}},
NULL);
term->delayed_render_timer.is_armed = true;
}
}
} else
term->render.pending.grid = true;
if (hup) {
if (term->hold_at_exit) {
fdm_del(fdm, fd);
term->ptmx = -1;
return true;
} else
return term_shutdown(term);
}
return true;
}
static bool
fdm_flash(struct fdm *fdm, int fd, int events, void *data)
{
if (events & EPOLLHUP)
return false;
struct terminal *term = data;
uint64_t expiration_count;
ssize_t ret = read(
term->flash.fd, &expiration_count, sizeof(expiration_count));
if (ret < 0) {
if (errno == EAGAIN)
return true;
LOG_ERRNO("failed to read flash timer");
return false;
}
LOG_DBG("flash timer expired %llu times",
(unsigned long long)expiration_count);
term->flash.active = false;
term_damage_view(term);
render_refresh(term);
return true;
}
static bool
fdm_blink(struct fdm *fdm, int fd, int events, void *data)
{
if (events & EPOLLHUP)
return false;
struct terminal *term = data;
uint64_t expiration_count;
ssize_t ret = read(
term->blink.fd, &expiration_count, sizeof(expiration_count));
if (ret < 0) {
if (errno == EAGAIN)
return true;
LOG_ERRNO("failed to read blink timer");
return false;
}
LOG_DBG("blink timer expired %llu times",
(unsigned long long)expiration_count);
/* Invert blink state */
term->blink.state = term->blink.state == BLINK_ON
? BLINK_OFF : BLINK_ON;
/* Scan all visible cells and mark rows with blinking cells dirty */
bool no_blinking_cells = true;
for (int r = 0; r < term->rows; r++) {
struct row *row = grid_row_in_view(term->grid, r);
for (int col = 0; col < term->cols; col++) {
struct cell *cell = &row->cells[col];
if (cell->attrs.blink) {
cell->attrs.clean = 0;
row->dirty = true;
no_blinking_cells = false;
}
}
}
if (no_blinking_cells) {
LOG_DBG("disarming blink timer");
term->blink.active = false;
term->blink.state = BLINK_ON;
static const struct itimerspec disarm = {{0}};
if (timerfd_settime(term->blink.fd, 0, &disarm, NULL) < 0)
LOG_ERRNO("failed to disarm blink timer");
} else
render_refresh(term);
return true;
}
void
term_arm_blink_timer(struct terminal *term)
{
if (term->blink.active)
return;
LOG_DBG("arming blink timer");
struct itimerspec alarm = {
.it_value = {.tv_sec = 0, .tv_nsec = 500 * 1000000},
.it_interval = {.tv_sec = 0, .tv_nsec = 500 * 1000000},
};
if (timerfd_settime(term->blink.fd, 0, &alarm, NULL) < 0)
LOG_ERRNO("failed to arm blink timer");
else
term->blink.active = true;
}
static void
cursor_refresh(struct terminal *term)
{
term->grid->cur_row->cells[term->cursor.point.col].attrs.clean = 0;
term->grid->cur_row->dirty = true;
render_refresh(term);
}
static bool
fdm_cursor_blink(struct fdm *fdm, int fd, int events, void *data)
{
if (events & EPOLLHUP)
return false;
struct terminal *term = data;
uint64_t expiration_count;
ssize_t ret = read(
term->cursor_blink.fd, &expiration_count, sizeof(expiration_count));
if (ret < 0) {
if (errno == EAGAIN)
return true;
LOG_ERRNO("failed to read cursor blink timer");
return false;
}
LOG_DBG("cursor blink timer expired %llu times",
(unsigned long long)expiration_count);
/* Invert blink state */
term->cursor_blink.state = term->cursor_blink.state == CURSOR_BLINK_ON
? CURSOR_BLINK_OFF : CURSOR_BLINK_ON;
cursor_refresh(term);
return true;
}
static bool
fdm_delayed_render(struct fdm *fdm, int fd, int events, void *data)
{
if (events & EPOLLHUP)
return false;
struct terminal *term = data;
if (!term->delayed_render_timer.is_armed)
return true;
uint64_t unused;
ssize_t ret1 = 0;
ssize_t ret2 = 0;
if (fd == term->delayed_render_timer.lower_fd)
ret1 = read(term->delayed_render_timer.lower_fd, &unused, sizeof(unused));
if (fd == term->delayed_render_timer.upper_fd)
ret2 = read(term->delayed_render_timer.upper_fd, &unused, sizeof(unused));
if ((ret1 < 0 || ret2 < 0)) {
if (errno == EAGAIN)
return true;
LOG_ERRNO("failed to read timeout timer");
return false;
}
if (ret1 > 0)
LOG_DBG("lower delay timer expired");
else if (ret2 > 0)
LOG_DBG("upper delay timer expired");
#if PTMX_TIMING
last = (struct timespec){0};
#endif
render_refresh(term);
/* Reset timers */
struct itimerspec reset = {{0}};
timerfd_settime(term->delayed_render_timer.lower_fd, 0, &reset, NULL);
timerfd_settime(term->delayed_render_timer.upper_fd, 0, &reset, NULL);
term->delayed_render_timer.is_armed = false;
return true;
}
static bool
fdm_app_sync_updates_timeout(
struct fdm *fdm, int fd, int events, void *data)
{
if (events & EPOLLHUP)
return false;
struct terminal *term = data;
uint64_t unused;
ssize_t ret = read(term->render.app_sync_updates.timer_fd,
&unused, sizeof(unused));
if (ret < 0) {
if (errno == EAGAIN)
return true;
LOG_ERRNO("failed to read application synchronized updates timeout timer");
return false;
}
term_disable_app_sync_updates(term);
return true;
}
static void
initialize_color_cube(struct terminal *term)
{
/* First 16 entries have already been initialized from conf */
for (size_t r = 0; r < 6; r++) {
for (size_t g = 0; g < 6; g++) {
for (size_t b = 0; b < 6; b++) {
term->colors.default_table[16 + r * 6 * 6 + g * 6 + b]
= r * 51 << 16 | g * 51 << 8 | b * 51;
}
}
}
for (size_t i = 0; i < 24; i++)
term->colors.default_table[232 + i] = i * 11 << 16 | i * 11 << 8 | i * 11;
memcpy(term->colors.table, term->colors.default_table, sizeof(term->colors.table));
}
static bool
initialize_render_workers(struct terminal *term)
{
LOG_INFO("using %zu rendering threads", term->render.workers.count);
sem_init(&term->render.workers.start, 0, 0);
sem_init(&term->render.workers.done, 0, 0);
mtx_init(&term->render.workers.lock, mtx_plain);
cnd_init(&term->render.workers.cond);
term->render.workers.threads = calloc(
term->render.workers.count, sizeof(term->render.workers.threads[0]));
for (size_t i = 0; i < term->render.workers.count; i++) {
struct render_worker_context *ctx = malloc(sizeof(*ctx));
*ctx = (struct render_worker_context) {
.term = term,
.my_id = 1 + i,
};
int ret = thrd_create(
&term->render.workers.threads[i], &render_worker_thread, ctx);
if (ret != 0) {
LOG_ERRNO_P("failed to create render worker thread", ret);
term->render.workers.threads[i] = 0;
return false;
}
}
return true;
}
static bool
term_set_fonts(struct terminal *term, struct font *fonts[static 4])
{
for (size_t i = 0; i < 4; i++) {
assert(fonts[i] != NULL);
font_destroy(term->fonts[i]);
term->fonts[i] = fonts[i];
}
term->cell_width = term->fonts[0]->space_x_advance > 0
? term->fonts[0]->space_x_advance : term->fonts[0]->max_x_advance;
term->cell_height = max(term->fonts[0]->height,
term->fonts[0]->ascent + term->fonts[0]->descent);
LOG_INFO("cell width=%d, height=%d", term->cell_width, term->cell_height);
render_resize_force(term, term->width / term->scale, term->height / term->scale);
return true;
}
static unsigned
get_font_dpi(const struct terminal *term)
{
/*
* Use output's DPI to scale font. This is to ensure the font has
* the same physical height (if measured by a ruler) regardless of
* monitor.
*
* Conceptually, we use the physical monitor specs to calculate
* the DPI, and we ignore the output's scaling factor.
*
* However, to deal with fractional scaling, where we're told to
* render at e.g. 2x, but are then downscaled by the compositor to
* e.g. 1.25, we use the scaled DPI value multiplied by the scale
* factor instead.
*
* For integral scaling factors the resulting DPI is the same as
* if we had used the physical DPI.
*
* For fractional scaling factors we'll get a DPI *larger* than
* the physical DPI, that ends up being right when later
* downscaled by the compositor.
*/
/* Use highest DPI from outputs we're mapped on */
unsigned dpi = 0;
assert(term->window != NULL);
tll_foreach(term->window->on_outputs, it) {
if (it->item->ppi.scaled.y > dpi)
dpi = it->item->ppi.scaled.y * term->scale;
}
/* If we're not mapped, use DPI from first monitor. Hopefully this is where we'll get mapped later... */
if (dpi == 0) {
tll_foreach(term->wl->monitors, it) {
dpi = it->item.ppi.scaled.y * term->scale;
break;
}
}
if (dpi == 0) {
/* No monitors? */
dpi = 96;
}
return dpi;
}
static bool
load_fonts_from_conf(const struct terminal *term, const struct config *conf,
struct font *fonts[static 4])
{
const size_t count = tll_length(conf->fonts);
const char *names[count];
size_t i = 0;
tll_foreach(conf->fonts, it)
names[i++] = it->item;
char attrs0[64], attrs1[64], attrs2[64], attrs3[64];
snprintf(attrs0, sizeof(attrs0), "dpi=%u", term->font_dpi);
snprintf(attrs1, sizeof(attrs1), "dpi=%u:weight=bold", term->font_dpi);
snprintf(attrs2, sizeof(attrs2), "dpi=%u:slant=italic", term->font_dpi);
snprintf(attrs3, sizeof(attrs3), "dpi=%u:weight=bold:slant=italic", term->font_dpi);
fonts[0] = fonts[1] = fonts[2] = fonts[3] = NULL;
bool ret =
(fonts[0] = font_from_name(count, names, attrs0)) != NULL &&
(fonts[1] = font_from_name(count, names, attrs1)) != NULL &&
(fonts[2] = font_from_name(count, names, attrs2)) != NULL &&
(fonts[3] = font_from_name(count, names, attrs3)) != NULL;
if (!ret) {
LOG_ERR("failed to load primary fonts");
for (size_t i = 0; i < 4; i++) {
font_destroy(fonts[i]);
fonts[i] = NULL;
}
}
return ret;
}
struct terminal *
term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
const char *term_env, bool login_shell, const char *foot_exe,
const char *cwd, int argc, char *const *argv,
void (*shutdown_cb)(void *data, int exit_code), void *shutdown_data)
{
int ptmx = -1;
int flash_fd = -1;
int blink_fd = -1;
int cursor_blink_fd = -1;
int delay_lower_fd = -1;
int delay_upper_fd = -1;
int app_sync_updates_fd = -1;
struct terminal *term = malloc(sizeof(*term));
if ((ptmx = posix_openpt(O_RDWR | O_NOCTTY)) == -1) {
LOG_ERRNO("failed to open PTY");
goto close_fds;
}
if ((flash_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1) {
LOG_ERRNO("failed to create flash timer FD");
goto close_fds;
}
if ((blink_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1) {
LOG_ERRNO("failed to create blink timer FD");
goto close_fds;
}
if ((cursor_blink_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1) {
LOG_ERRNO("failed to create cursor blink timer FD");
goto close_fds;
}
if ((delay_lower_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1 ||
(delay_upper_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1)
{
LOG_ERRNO("failed to create delayed rendering timer FDs");
goto close_fds;
}
if ((app_sync_updates_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK)) == -1)
{
LOG_ERRNO("failed to create application synchronized updates timer FD");
goto close_fds;
}
int ptmx_flags;
if ((ptmx_flags = fcntl(ptmx, F_GETFL)) < 0 ||
fcntl(ptmx, F_SETFL, ptmx_flags | O_NONBLOCK) < 0)
{
LOG_ERRNO("failed to configure ptmx as non-blocking");
goto err;
}
if (!fdm_add(fdm, ptmx, EPOLLIN, &fdm_ptmx, term) ||
!fdm_add(fdm, flash_fd, EPOLLIN, &fdm_flash, term) ||
!fdm_add(fdm, blink_fd, EPOLLIN, &fdm_blink, term) ||
!fdm_add(fdm, cursor_blink_fd, EPOLLIN, &fdm_cursor_blink, term) ||
!fdm_add(fdm, delay_lower_fd, EPOLLIN, &fdm_delayed_render, term) ||
!fdm_add(fdm, delay_upper_fd, EPOLLIN, &fdm_delayed_render, term) ||
!fdm_add(fdm, app_sync_updates_fd, EPOLLIN, &fdm_app_sync_updates_timeout, term))
{
goto err;
}
/* Initialize configure-based terminal attributes */
*term = (struct terminal) {
.fdm = fdm,
.conf = conf,
.quit = false,
.ptmx = ptmx,
.ptmx_buffer = tll_init(),
.font_dpi = 0,
.font_adjustments = 0,
.cursor_keys_mode = CURSOR_KEYS_NORMAL,
.keypad_keys_mode = KEYPAD_NUMERICAL,
.auto_margin = true,
.window_title_stack = tll_init(),
.scale = 1,
.flash = {.fd = flash_fd},
.blink = {.fd = blink_fd},
.vt = {
.state = 0, /* STATE_GROUND */
},
.colors = {
.fg = conf->colors.fg,
.bg = conf->colors.bg,
.default_fg = conf->colors.fg,
.default_bg = conf->colors.bg,
.default_table = {
conf->colors.regular[0],
conf->colors.regular[1],
conf->colors.regular[2],
conf->colors.regular[3],
conf->colors.regular[4],
conf->colors.regular[5],
conf->colors.regular[6],
conf->colors.regular[7],
conf->colors.bright[0],
conf->colors.bright[1],
conf->colors.bright[2],
conf->colors.bright[3],
conf->colors.bright[4],
conf->colors.bright[5],
conf->colors.bright[6],
conf->colors.bright[7],
},
.alpha = conf->colors.alpha,
},
.origin = ORIGIN_ABSOLUTE,
.default_cursor_style = conf->cursor.style,
.cursor_style = conf->cursor.style,
.cursor_blink = {
.active = false,
.state = CURSOR_BLINK_ON,
.fd = cursor_blink_fd,
},
.default_cursor_color = {
.text = conf->cursor.color.text,
.cursor = conf->cursor.color.cursor,
},
.cursor_color = {
.text = conf->cursor.color.text,
.cursor = conf->cursor.color.cursor,
},
.xcursor = "text",
.selection = {
.start = {-1, -1},
.end = {-1, -1},
},
.normal = {.damage = tll_init(), .scroll_damage = tll_init()},
.alt = {.damage = tll_init(), .scroll_damage = tll_init()},
.grid = &term->normal,
.meta = {
.esc_prefix = true,
.eight_bit = true,
},
.tab_stops = tll_init(),
.wl = wayl,
.render = {
.scrollback_lines = conf->scrollback_lines,
.app_sync_updates.timer_fd = app_sync_updates_fd,
.workers = {
.count = conf->render_worker_count,
.queue = tll_init(),
},
.presentation_timings = conf->presentation_timings,
},
.delayed_render_timer = {
.is_armed = false,
.lower_fd = delay_lower_fd,
.upper_fd = delay_upper_fd,
},
.sixel = {
.palette_size = SIXEL_MAX_COLORS,
},
.sixel_images = tll_init(),
.hold_at_exit = conf->hold_at_exit,
.shutdown_cb = shutdown_cb,
.shutdown_data = shutdown_data,
.foot_exe = strdup(foot_exe),
.cwd = strdup(cwd),
};
/* Guess scale; we're not mapped yet, so we don't know on which
* output we'll be. Pick highest scale we find for now */
tll_foreach(term->wl->monitors, it) {
if (it->item.scale > term->scale)
term->scale = it->item.scale;
}
initialize_color_cube(term);
if (!initialize_render_workers(term))
goto err;
/* Initialize the Wayland window backend */
if ((term->window = wayl_win_init(term)) == NULL)
goto err;
/* Let the Wayland backend know we exist */
tll_push_back(wayl->terms, term);
wayl_roundtrip(term->wl);
term_set_window_title(term, "foot");
/* Load fonts */
if (!term_font_dpi_changed(term))
goto err;
/* Start the slave/client */
if ((term->slave = slave_spawn(term->ptmx, argc, term->cwd, argv, term_env, conf->shell, login_shell)) == -1)
goto err;
return term;
err:
term_destroy(term);
return NULL;
close_fds:
fdm_del(fdm, ptmx);
fdm_del(fdm, flash_fd);
fdm_del(fdm, blink_fd);
fdm_del(fdm, cursor_blink_fd);
fdm_del(fdm, delay_lower_fd);
fdm_del(fdm, delay_upper_fd);
fdm_del(fdm, app_sync_updates_fd);
free(term);
return NULL;
}
static bool
fdm_shutdown(struct fdm *fdm, int fd, int events, void *data)
{
LOG_DBG("FDM shutdown");
struct terminal *term = data;
/* Kill the event FD */
fdm_del(term->fdm, fd);
wayl_win_destroy(term->window);
term->window = NULL;
struct wayland *wayl __attribute__((unused)) = term->wl;
/*
* Normally we'd get unmapped when we destroy the Wayland
* above.
*
* However, it appears that under certain conditions, those events
* are deferred (for example, when a screen locker is active), and
* thus we can get here without having been unmapped.
*/
if (wayl->kbd_focus == term)
wayl->kbd_focus = NULL;
if (wayl->mouse_focus == term)
wayl->mouse_focus = NULL;
assert(wayl->kbd_focus != term);
assert(wayl->mouse_focus != term);
void (*cb)(void *, int) = term->shutdown_cb;
void *cb_data = term->shutdown_data;
int exit_code = term_destroy(term);
if (cb != NULL)
cb(cb_data, exit_code);
return true;
}
bool
term_shutdown(struct terminal *term)
{
if (term->is_shutting_down)
return true;
term->is_shutting_down = true;
/*
* Close FDs then postpone self-destruction to the next poll
* iteration, by creating an event FD that we trigger immediately.
*/
term_cursor_blink_disable(term);
fdm_del(term->fdm, term->render.app_sync_updates.timer_fd);
fdm_del(term->fdm, term->delayed_render_timer.lower_fd);
fdm_del(term->fdm, term->delayed_render_timer.upper_fd);
fdm_del(term->fdm, term->cursor_blink.fd);
fdm_del(term->fdm, term->blink.fd);
fdm_del(term->fdm, term->flash.fd);
fdm_del(term->fdm, term->ptmx);
term->render.app_sync_updates.timer_fd = -1;
term->delayed_render_timer.lower_fd = -1;
term->delayed_render_timer.upper_fd = -1;
term->cursor_blink.fd = -1;
term->blink.fd = -1;
term->flash.fd = -1;
term->ptmx = -1;
int event_fd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (event_fd == -1) {
LOG_ERRNO("failed to create terminal shutdown event FD");
return false;
}
if (!fdm_add(term->fdm, event_fd, EPOLLIN, &fdm_shutdown, term)) {
close(event_fd);
return false;
}
if (write(event_fd, &(uint64_t){1}, sizeof(uint64_t)) != sizeof(uint64_t)) {
LOG_ERRNO("failed to send terminal shutdown event");
fdm_del(term->fdm, event_fd);
return false;
}
return true;
}
static volatile sig_atomic_t alarm_raised;
static void
sig_alarm(int signo)
{
LOG_DBG("SIGALRM");
alarm_raised = 1;
}
int
term_destroy(struct terminal *term)
{
if (term == NULL)
return 0;
tll_foreach(term->wl->terms, it) {
if (it->item == term) {
tll_remove(term->wl->terms, it);
break;
}
}
fdm_del(term->fdm, term->render.app_sync_updates.timer_fd);
fdm_del(term->fdm, term->delayed_render_timer.lower_fd);
fdm_del(term->fdm, term->delayed_render_timer.upper_fd);
fdm_del(term->fdm, term->cursor_blink.fd);
fdm_del(term->fdm, term->blink.fd);
fdm_del(term->fdm, term->flash.fd);
fdm_del(term->fdm, term->ptmx);
if (term->window != NULL)
wayl_win_destroy(term->window);
mtx_lock(&term->render.workers.lock);
assert(tll_length(term->render.workers.queue) == 0);
/* Count livinig threads - we may get here when only some of the
* threads have been successfully started */
size_t worker_count = 0;
for (size_t i = 0; i < term->render.workers.count; i++, worker_count++) {
if (term->render.workers.threads[i] == 0)
break;
}
for (size_t i = 0; i < worker_count; i++) {
sem_post(&term->render.workers.start);
tll_push_back(term->render.workers.queue, -2);
}
cnd_broadcast(&term->render.workers.cond);
mtx_unlock(&term->render.workers.lock);
free(term->vt.osc.data);
for (int row = 0; row < term->normal.num_rows; row++)
grid_row_free(term->normal.rows[row]);
free(term->normal.rows);
for (int row = 0; row < term->alt.num_rows; row++)
grid_row_free(term->alt.rows[row]);
free(term->alt.rows);
free(term->window_title);
tll_free_and_free(term->window_title_stack, free);
for (size_t i = 0; i < sizeof(term->fonts) / sizeof(term->fonts[0]); i++)
font_destroy(term->fonts[i]);
free(term->search.buf);
for (size_t i = 0; i < term->render.workers.count; i++) {
if (term->render.workers.threads[i] != 0)
thrd_join(term->render.workers.threads[i], NULL);
}
free(term->render.workers.threads);
cnd_destroy(&term->render.workers.cond);
mtx_destroy(&term->render.workers.lock);
sem_destroy(&term->render.workers.start);
sem_destroy(&term->render.workers.done);
assert(tll_length(term->render.workers.queue) == 0);
tll_free(term->render.workers.queue);
tll_foreach(term->ptmx_buffer, it)
free(it->item.data);
tll_free(term->ptmx_buffer);
tll_free(term->tab_stops);
tll_foreach(term->sixel_images, it)
sixel_destroy(&it->item);
tll_free(term->sixel_images);
free(term->foot_exe);
free(term->cwd);
int ret = EXIT_SUCCESS;
if (term->slave > 0) {
LOG_DBG("waiting for slave (PID=%u) to die", term->slave);
/*
* Note: we've closed ptmx, so the slave *should* exit...
*
* But, since it is possible to write clients that ignore
* this, we need to handle it in *some* way.
*
* So, what we do is register a SIGALRM handler, and configure
* a 2 second alarm. If the slave hasn't died after this time,
* we send it a SIGTERM, then wait another 2 seconds (using
* the same alarm mechanism). If it still hasn't died, we send
* it a SIGKILL.
*
* Note that this solution is *not* asynchronous, and any
* other events etc will be ignored during this time. This of
* course only applies to a 'foot --server' instance, where
* there might be other terminals running.
*/
sigaction(SIGALRM, &(const struct sigaction){.sa_handler = &sig_alarm}, NULL);
alarm(2);
int status;
int kill_signal = SIGTERM;
while (true) {
int r = waitpid(term->slave, &status, 0);
if (r == term->slave)
break;
if (r == -1) {
assert(errno == EINTR);
if (alarm_raised) {
LOG_DBG("slave hasn't died yet, sending: %s (%d)",
kill_signal == SIGTERM ? "SIGTERM" : "SIGKILL",
kill_signal);
kill(term->slave, kill_signal);
alarm_raised = 0;
if (kill_signal != SIGKILL)
alarm(2);
kill_signal = SIGKILL;
}
}
}
/* Cancel alarm */
alarm(0);
sigaction(SIGALRM, &(const struct sigaction){.sa_handler = SIG_DFL}, NULL);
ret = EXIT_FAILURE;
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
LOG_DBG("slave exited with code %d", ret);
} else if (WIFSIGNALED(status)) {
ret = WTERMSIG(status);
LOG_WARN("slave exited with signal %d (%s)", ret, strsignal(ret));
} else {
LOG_WARN("slave exited for unknown reason (status = 0x%08x)", status);
}
}
free(term);
#if defined(__GLIBC__)
if (!malloc_trim(0))
LOG_WARN("failed to trim memory");
#endif
return ret;
}
void
term_reset(struct terminal *term, bool hard)
{
term->cursor_keys_mode = CURSOR_KEYS_NORMAL;
term->keypad_keys_mode = KEYPAD_NUMERICAL;
term->reverse = false;
term->hide_cursor = false;
term->auto_margin = true;
term->insert_mode = false;
term->bracketed_paste = false;
term->focus_events = false;
term->mouse_tracking = MOUSE_NONE;
term->mouse_reporting = MOUSE_NORMAL;
term->charsets.selected = 0;
term->charsets.set[0] = CHARSET_ASCII;
term->charsets.set[1] = CHARSET_ASCII;
term->charsets.set[2] = CHARSET_ASCII;
term->charsets.set[3] = CHARSET_ASCII;
term->saved_charsets = term->charsets;
tll_free_and_free(term->window_title_stack, free);
free(term->window_title);
term->window_title = strdup("foot");
term->scroll_region.start = 0;
term->scroll_region.end = term->rows;
free(term->vt.osc.data);
memset(&term->vt, 0, sizeof(term->vt));
term->vt.state = 0; /* GROUND */
if (term->grid == &term->alt) {
term->grid = &term->normal;
term_restore_cursor(term);
selection_cancel(term);
}
term->meta.esc_prefix = true;
term->meta.eight_bit = true;
tll_foreach(term->sixel_images, it)
sixel_destroy(&it->item);
tll_free(term->sixel_images);
if (!hard)
return;
term->flash.active = false;
term->blink.active = false;
term->blink.state = BLINK_ON;
term->colors.fg = term->colors.default_fg;
term->colors.bg = term->colors.default_bg;
for (size_t i = 0; i < 256; i++)
term->colors.table[i] = term->colors.default_table[i];
term->origin = ORIGIN_ABSOLUTE;
term->cursor.lcf = false;
term->cursor = (struct cursor){.point = {0, 0}};
term->saved_cursor = (struct cursor){.point = {0, 0}};
term->alt_saved_cursor = (struct cursor){.point = {0, 0}};
term->cursor_style = term->default_cursor_style;
term_cursor_blink_disable(term);
term->cursor_color.text = term->default_cursor_color.text;
term->cursor_color.cursor = term->default_cursor_color.cursor;
selection_cancel(term);
term->normal.offset = term->normal.view = 0;
term->alt.offset = term->alt.view = 0;
for (size_t i = 0; i < term->rows; i++) {
term->normal.rows[i] = grid_row_alloc(term->cols, true);
term->alt.rows[i] = grid_row_alloc(term->cols, true);
}
for (size_t i = term->rows; i < term->normal.num_rows; i++) {
grid_row_free(term->normal.rows[i]);
term->normal.rows[i] = NULL;
}
for (size_t i = term->rows; i < term->alt.num_rows; i++) {
grid_row_free(term->alt.rows[i]);
term->alt.rows[i] = NULL;
}
term->normal.cur_row = term->normal.rows[0];
term->alt.cur_row = term->alt.rows[0];
tll_free(term->normal.damage);
tll_free(term->normal.scroll_damage);
tll_free(term->alt.damage);
tll_free(term->alt.scroll_damage);
term->render.last_cursor.cell = NULL;
term->render.was_flashing = false;
term_damage_all(term);
}
static bool
term_font_size_adjust(struct terminal *term, double amount)
{
struct font *fonts[4] = {
font_size_adjust(term->fonts[0], amount),
font_size_adjust(term->fonts[1], amount),
font_size_adjust(term->fonts[2], amount),
font_size_adjust(term->fonts[3], amount),
};
if (fonts[0] == NULL || fonts[1] == NULL ||
fonts[2] == NULL || fonts[3] == NULL)
{
for (size_t i = 0; i < 4; i++)
font_destroy(fonts[i]);
return false;
}
term_set_fonts(term, fonts);
return true;
}
bool
term_font_size_increase(struct terminal *term)
{
if (!term_font_size_adjust(term, 0.5))
return false;
term->font_adjustments++;
return true;
}
bool
term_font_size_decrease(struct terminal *term)
{
if (!term_font_size_adjust(term, -0.5))
return false;
term->font_adjustments--;
return true;
}
bool
term_font_size_reset(struct terminal *term)
{
struct font *fonts[4];
if (!load_fonts_from_conf(term, term->conf, fonts))
return false;
term_set_fonts(term, fonts);
term->font_adjustments = 0;
return true;
}
bool
term_font_dpi_changed(struct terminal *term)
{
unsigned dpi = get_font_dpi(term);
if (dpi == term->font_dpi)
return true;
LOG_DBG("DPI changed (%u -> %u): reloading fonts", term->font_dpi, dpi);
term->font_dpi = dpi;
struct font *fonts[4];
if (!load_fonts_from_conf(term, term->conf, fonts))
return false;
if (term->font_adjustments == 0)
return term_set_fonts(term, fonts);
/* User has adjusted the font size run-time, re-apply */
double amount = term->font_adjustments * 0.5;
struct font *adjusted_fonts[4] = {
font_size_adjust(fonts[0], amount),
font_size_adjust(fonts[1], amount),
font_size_adjust(fonts[2], amount),
font_size_adjust(fonts[3], amount),
};
if (adjusted_fonts[0] == NULL || adjusted_fonts[1] == NULL ||
adjusted_fonts[2] == NULL || adjusted_fonts[3] == NULL)
{
for (size_t i = 0; i < 4; i++)
font_destroy(adjusted_fonts[i]);
/* At least use the newly re-loaded default fonts */
term->font_adjustments = 0;
return term_set_fonts(term, fonts);
} else {
for (size_t i = 0; i < 4; i++)
font_destroy(fonts[i]);
return term_set_fonts(term, adjusted_fonts);
}
assert(false);
return false;
}
void
term_damage_rows(struct terminal *term, int start, int end)
{
assert(start <= end);
for (int r = start; r <= end; r++) {
struct row *row = grid_row(term->grid, r);
row->dirty = true;
for (int c = 0; c < term->grid->num_cols; c++)
row->cells[c].attrs.clean = 0;
}
}
void
term_damage_rows_in_view(struct terminal *term, int start, int end)
{
assert(start <= end);
for (int r = start; r <= end; r++) {
struct row *row = grid_row_in_view(term->grid, r);
row->dirty = true;
for (int c = 0; c < term->grid->num_cols; c++)
row->cells[c].attrs.clean = 0;
}
}
void
term_damage_all(struct terminal *term)
{
term_damage_rows(term, 0, term->rows - 1);
}
void
term_damage_view(struct terminal *term)
{
term_damage_rows_in_view(term, 0, term->rows - 1);
}
void
term_damage_scroll(struct terminal *term, enum damage_type damage_type,
struct scroll_region region, int lines)
{
if (tll_length(term->grid->scroll_damage) > 0) {
struct damage *dmg = &tll_back(term->grid->scroll_damage);
if (dmg->type == damage_type &&
dmg->scroll.region.start == region.start &&
dmg->scroll.region.end == region.end)
{
dmg->scroll.lines += lines;
return;
}
}
struct damage dmg = {
.type = damage_type,
.scroll = {.region = region, .lines = lines},
};
tll_push_back(term->grid->scroll_damage, dmg);
}
static inline void
erase_cell_range(struct terminal *term, struct row *row, int start, int end)
{
assert(start < term->cols);
assert(end < term->cols);
if (unlikely(term->vt.attrs.have_bg)) {
for (int col = start; col <= end; col++) {
struct cell *c = &row->cells[col];
c->wc = 0;
c->attrs = (struct attributes){.have_bg = 1, .bg = term->vt.attrs.bg};
}
} else
memset(&row->cells[start], 0, (end - start + 1) * sizeof(row->cells[0]));
row->dirty = true;
}
static inline void
erase_line(struct terminal *term, struct row *row)
{
erase_cell_range(term, row, 0, term->cols - 1);
row->linebreak = false;
}
void
term_erase(struct terminal *term, const struct coord *start, const struct coord *end)
{
assert(start->row <= end->row);
assert(start->col <= end->col || start->row < end->row);
if (start->row == end->row) {
struct row *row = grid_row(term->grid, start->row);
erase_cell_range(term, row, start->col, end->col);
sixel_delete_at_row(term, start->row);
return;
}
assert(end->row > start->row);
erase_cell_range(
term, grid_row(term->grid, start->row), start->col, term->cols - 1);
for (int r = start->row + 1; r < end->row; r++)
erase_line(term, grid_row(term->grid, r));
erase_cell_range(term, grid_row(term->grid, end->row), 0, end->col);
sixel_delete_in_range(term, start->row, end->row);
}
int
term_row_rel_to_abs(const struct terminal *term, int row)
{
switch (term->origin) {
case ORIGIN_ABSOLUTE:
return min(row, term->rows - 1);
case ORIGIN_RELATIVE:
return min(row + term->scroll_region.start, term->scroll_region.end - 1);
}
assert(false);
return -1;
}
void
term_cursor_to(struct terminal *term, int row, int col)
{
assert(row < term->rows);
assert(col < term->cols);
term->cursor.lcf = false;
term->cursor.point.col = col;
term->cursor.point.row = row;
term->grid->cur_row = grid_row(term->grid, row);
}
void
term_cursor_home(struct terminal *term)
{
term_cursor_to(term, term_row_rel_to_abs(term, 0), 0);
}
void
term_cursor_left(struct terminal *term, int count)
{
int move_amount = min(term->cursor.point.col, count);
term->cursor.point.col -= move_amount;
assert(term->cursor.point.col >= 0);
term->cursor.lcf = false;
}
void
term_cursor_right(struct terminal *term, int count)
{
int move_amount = min(term->cols - term->cursor.point.col - 1, count);
term->cursor.point.col += move_amount;
assert(term->cursor.point.col < term->cols);
term->cursor.lcf = false;
}
void
term_cursor_up(struct terminal *term, int count)
{
int top = term->origin == ORIGIN_ABSOLUTE ? 0 : term->scroll_region.start;
assert(term->cursor.point.row >= top);
int move_amount = min(term->cursor.point.row - top, count);
term_cursor_to(term, term->cursor.point.row - move_amount, term->cursor.point.col);
}
void
term_cursor_down(struct terminal *term, int count)
{
int bottom = term->origin == ORIGIN_ABSOLUTE ? term->rows : term->scroll_region.end;
assert(bottom >= term->cursor.point.row);
int move_amount = min(bottom - term->cursor.point.row - 1, count);
term_cursor_to(term, term->cursor.point.row + move_amount, term->cursor.point.col);
}
static bool
cursor_blink_start_timer(struct terminal *term)
{
static const struct itimerspec timer = {
.it_value = {.tv_sec = 0, .tv_nsec = 500000000},
.it_interval = {.tv_sec = 0, .tv_nsec = 500000000},
};
if (timerfd_settime(term->cursor_blink.fd, 0, &timer, NULL) < 0) {
LOG_ERRNO("failed to arm cursor blink timer");
return false;
}
return true;
}
static bool
cursor_blink_stop_timer(struct terminal *term)
{
return timerfd_settime(term->cursor_blink.fd, 0, &(struct itimerspec){{0}}, NULL) == 0;
}
void
term_cursor_blink_enable(struct terminal *term)
{
term->cursor_blink.state = CURSOR_BLINK_ON;
term->cursor_blink.active = term->wl->kbd_focus == term
? cursor_blink_start_timer(term) : true;
}
void
term_cursor_blink_disable(struct terminal *term)
{
term->cursor_blink.active = false;
term->cursor_blink.state = CURSOR_BLINK_ON;
cursor_blink_stop_timer(term);
}
void
term_cursor_blink_restart(struct terminal *term)
{
if (term->cursor_blink.active) {
term->cursor_blink.state = CURSOR_BLINK_ON;
term->cursor_blink.active = term->wl->kbd_focus == term
? cursor_blink_start_timer(term) : true;
}
}
void
term_scroll_partial(struct terminal *term, struct scroll_region region, int rows)
{
LOG_DBG("scroll: rows=%d, region.start=%d, region.end=%d",
rows, region.start, region.end);
#if 0
if (rows > region.end - region.start) {
/* For now, clamp */
rows = region.end - region.start;
}
#endif
bool view_follows = term->grid->view == term->grid->offset;
term->grid->offset += rows;
term->grid->offset &= term->grid->num_rows - 1;
if (view_follows)
term->grid->view = term->grid->offset;
/* Top non-scrolling region. */
for (int i = region.start - 1; i >= 0; i--)
grid_swap_row(term->grid, i - rows, i, false);
/* Bottom non-scrolling region */
for (int i = term->rows - 1; i >= region.end; i--)
grid_swap_row(term->grid, i - rows, i, false);
/* Erase scrolled in lines */
for (int r = max(region.end - rows, region.start); r < region.end; r++) {
erase_line(term, grid_row_and_alloc(term->grid, r));
//sixel_delete_at_row(term, r);
if (selection_on_row_in_view(term, r))
selection_cancel(term);
}
sixel_delete_in_range(term, max(region.end - rows, region.start), region.end - 1);
term_damage_scroll(term, DAMAGE_SCROLL, region, rows);
term->grid->cur_row = grid_row(term->grid, term->cursor.point.row);
}
void
term_scroll(struct terminal *term, int rows)
{
term_scroll_partial(term, term->scroll_region, rows);
}
void
term_scroll_reverse_partial(struct terminal *term,
struct scroll_region region, int rows)
{
LOG_DBG("scroll reverse: rows=%d, region.start=%d, region.end=%d",
rows, region.start, region.end);
#if 0
if (rows > region.end - region.start) {
/* For now, clamp */
rows = region.end - region.start;
}
#endif
bool view_follows = term->grid->view == term->grid->offset;
term->grid->offset -= rows;
while (term->grid->offset < 0)
term->grid->offset += term->grid->num_rows;
term->grid->offset &= term->grid->num_rows - 1;
assert(term->grid->offset >= 0);
assert(term->grid->offset < term->grid->num_rows);
if (view_follows)
term->grid->view = term->grid->offset;
/* Bottom non-scrolling region */
for (int i = region.end + rows; i < term->rows + rows; i++)
grid_swap_row(term->grid, i, i - rows, false);
/* Top non-scrolling region */
for (int i = 0 + rows; i < region.start + rows; i++)
grid_swap_row(term->grid, i, i - rows, false);
/* Erase scrolled in lines */
for (int r = region.start; r < min(region.start + rows, region.end); r++) {
erase_line(term, grid_row_and_alloc(term->grid, r));
//sixel_delete_at_row(term, r);
if (selection_on_row_in_view(term, r))
selection_cancel(term);
}
sixel_delete_in_range(term, region.start, min(region.start + rows, region.end) - 1);
term_damage_scroll(term, DAMAGE_SCROLL_REVERSE, region, rows);
term->grid->cur_row = grid_row(term->grid, term->cursor.point.row);
}
void
term_scroll_reverse(struct terminal *term, int rows)
{
term_scroll_reverse_partial(term, term->scroll_region, rows);
}
void
term_formfeed(struct terminal *term)
{
term_cursor_left(term, term->cursor.point.col);
}
void
term_linefeed(struct terminal *term)
{
term->grid->cur_row->linebreak = true;
if (term->cursor.point.row == term->scroll_region.end - 1)
term_scroll(term, 1);
else
term_cursor_down(term, 1);
}
void
term_reverse_index(struct terminal *term)
{
if (term->cursor.point.row == term->scroll_region.start)
term_scroll_reverse(term, 1);
else
term_cursor_up(term, 1);
}
void
term_reset_view(struct terminal *term)
{
if (term->grid->view == term->grid->offset)
return;
term->grid->view = term->grid->offset;
term_damage_view(term);
}
void
term_restore_cursor(struct terminal *term)
{
int row = min(term->saved_cursor.point.row, term->rows - 1);
int col = min(term->saved_cursor.point.col, term->cols - 1);
term_cursor_to(term, row, col);
term->cursor.lcf = term->saved_cursor.lcf;
}
void
term_visual_focus_in(struct terminal *term)
{
if (term->visual_focus)
return;
term->visual_focus = true;
if (term->cursor_blink.active)
cursor_blink_start_timer(term);
render_refresh_csd(term);
cursor_refresh(term);
}
void
term_visual_focus_out(struct terminal *term)
{
if (!term->visual_focus)
return;
term->visual_focus = false;
if (term->cursor_blink.active)
cursor_blink_stop_timer(term);
render_refresh_csd(term);
cursor_refresh(term);
}
void
term_kbd_focus_in(struct terminal *term)
{
if (term->focus_events)
term_to_slave(term, "\033[I", 3);
}
void
term_kbd_focus_out(struct terminal *term)
{
if (term->focus_events)
term_to_slave(term, "\033[O", 3);
}
static int
linux_mouse_button_to_x(int button)
{
switch (button) {
case BTN_LEFT: return 1;
case BTN_MIDDLE: return 2;
case BTN_RIGHT: return 3;
case BTN_BACK: return 4;
case BTN_FORWARD: return 5;
case BTN_SIDE: return 8;
case BTN_EXTRA: return 9;
case BTN_TASK: return -1; /* TODO: ??? */
default:
LOG_WARN("unrecognized mouse button: %d (0x%x)", button, button);
return -1;
}
}
static int
encode_xbutton(int xbutton)
{
switch (xbutton) {
case 1: case 2: case 3:
return xbutton - 1;
case 4: case 5:
/* Like button 1 and 2, but with 64 added */
return xbutton - 4 + 64;
case 6: case 7:
/* Same as 4 and 5. Note: the offset should be something else? */
return xbutton - 6 + 64;
case 8: case 9: case 10: case 11:
/* Similar to 4 and 5, but adding 128 instead of 64 */
return xbutton - 8 + 128;
default:
LOG_ERR("cannot encode X mouse button: %d", xbutton);
return -1;
}
}
static void
report_mouse_click(struct terminal *term, int encoded_button, int row, int col,
bool release)
{
char response[128];
switch (term->mouse_reporting) {
case MOUSE_NORMAL: {
int encoded_col = 32 + col + 1;
int encoded_row = 32 + row + 1;
if (encoded_col > 255 || encoded_row > 255)
return;
snprintf(response, sizeof(response), "\033[M%c%c%c",
32 + (release ? 3 : encoded_button), encoded_col, encoded_row);
break;
}
case MOUSE_SGR:
snprintf(response, sizeof(response), "\033[<%d;%d;%d%c",
encoded_button, col + 1, row + 1, release ? 'm' : 'M');
break;
case MOUSE_URXVT:
snprintf(response, sizeof(response), "\033[%d;%d;%dM",
32 + (release ? 3 : encoded_button), col + 1, row + 1);
break;
case MOUSE_UTF8:
/* Unimplemented */
return;
}
term_to_slave(term, response, strlen(response));
}
static void
report_mouse_motion(struct terminal *term, int encoded_button, int row, int col)
{
report_mouse_click(term, encoded_button, row, col, false);
}
bool
term_mouse_grabbed(const struct terminal *term)
{
/*
* Mouse is grabbed by us, regardless of whether mouse tracking has been enabled or not.
*/
return
term->wl->kbd_focus == term &&
term->wl->kbd.shift &&
!term->wl->kbd.alt && /*!term->wl->kbd.ctrl &&*/ !term->wl->kbd.meta;
}
void
term_mouse_down(struct terminal *term, int button, int row, int col)
{
if (term_mouse_grabbed(term))
return;
/* Map libevent button event code to X button number */
int xbutton = linux_mouse_button_to_x(button);
if (xbutton == -1)
return;
int encoded = encode_xbutton(xbutton);
if (encoded == -1)
return;
bool has_focus = term->wl->kbd_focus == term;
bool shift = has_focus ? term->wl->kbd.shift : false;
bool alt = has_focus ? term->wl->kbd.alt : false;
bool ctrl = has_focus ? term->wl->kbd.ctrl : false;
encoded += (shift ? 4 : 0) + (alt ? 8 : 0) + (ctrl ? 16 : 0);
switch (term->mouse_tracking) {
case MOUSE_NONE:
break;
case MOUSE_CLICK:
case MOUSE_DRAG:
case MOUSE_MOTION:
report_mouse_click(term, encoded, row, col, false);
break;
case MOUSE_X10:
/* Never enabled */
assert(false && "unimplemented");
break;
}
}
void
term_mouse_up(struct terminal *term, int button, int row, int col)
{
if (term_mouse_grabbed(term))
return;
/* Map libevent button event code to X button number */
int xbutton = linux_mouse_button_to_x(button);
if (xbutton == -1)
return;
if (xbutton == 4 || xbutton == 5) {
/* No release events for scroll buttons */
return;
}
int encoded = encode_xbutton(xbutton);
if (encoded == -1)
return;
bool has_focus = term->wl->kbd_focus == term;
bool shift = has_focus ? term->wl->kbd.shift : false;
bool alt = has_focus ? term->wl->kbd.alt : false;
bool ctrl = has_focus ? term->wl->kbd.ctrl : false;
encoded += (shift ? 4 : 0) + (alt ? 8 : 0) + (ctrl ? 16 : 0);
switch (term->mouse_tracking) {
case MOUSE_NONE:
break;
case MOUSE_CLICK:
case MOUSE_DRAG:
case MOUSE_MOTION:
report_mouse_click(term, encoded, row, col, true);
break;
case MOUSE_X10:
/* Never enabled */
assert(false && "unimplemented");
break;
}
}
void
term_mouse_motion(struct terminal *term, int button, int row, int col)
{
if (term_mouse_grabbed(term))
return;
int encoded = 0;
if (button != 0) {
/* Map libevent button event code to X button number */
int xbutton = linux_mouse_button_to_x(button);
if (xbutton == -1)
return;
encoded = encode_xbutton(xbutton);
if (encoded == -1)
return;
} else
encoded = 3; /* "released" */
bool has_focus = term->wl->kbd_focus == term;
bool shift = has_focus ? term->wl->kbd.shift : false;
bool alt = has_focus ? term->wl->kbd.alt : false;
bool ctrl = has_focus ? term->wl->kbd.ctrl : false;
encoded += 32; /* Motion event */
encoded += (shift ? 4 : 0) + (alt ? 8 : 0) + (ctrl ? 16 : 0);
switch (term->mouse_tracking) {
case MOUSE_NONE:
case MOUSE_CLICK:
return;
case MOUSE_DRAG:
if (button == 0)
return;
/* FALLTHROUGH */
case MOUSE_MOTION:
report_mouse_motion(term, encoded, row, col);
break;
case MOUSE_X10:
/* Never enabled */
assert(false && "unimplemented");
break;
}
}
void
term_xcursor_update(struct terminal *term)
{
term->xcursor =
term->is_searching ? XCURSOR_LEFT_PTR :
selection_enabled(term) ? XCURSOR_TEXT :
XCURSOR_HAND2;
render_xcursor_set(term);
}
void
term_set_window_title(struct terminal *term, const char *title)
{
free(term->window_title);
term->window_title = strdup(title);
render_set_title(term, term->window_title);
}
void
term_flash(struct terminal *term, unsigned duration_ms)
{
LOG_DBG("FLASH for %ums", duration_ms);
struct itimerspec alarm = {
.it_value = {.tv_sec = 0, .tv_nsec = duration_ms * 1000000},
};
if (timerfd_settime(term->flash.fd, 0, &alarm, NULL) < 0)
LOG_ERRNO("failed to arm flash timer");
else {
term->flash.active = true;
}
}
bool
term_spawn_new(const struct terminal *term)
{
pid_t pid = fork();
if (pid < 0) {
LOG_ERRNO("failed to fork new terminal");
return false;
}
if (pid == 0) {
/* Child */
int pipe_fds[2] = {-1, -1};
if (pipe2(pipe_fds, O_CLOEXEC) < 0) {
LOG_ERRNO("failed to create pipe");
goto err;
}
/* Double fork */
pid_t pid2 = fork();
if (pid2 < 0) {
LOG_ERRNO("failed to double fork new terminal");
goto err;
}
if (pid2 == 0) {
/* Child */
close(pipe_fds[0]);
if (chdir(term->cwd) < 0 ||
execlp(term->foot_exe, term->foot_exe, NULL) < 0)
{
(void)!write(pipe_fds[1], &errno, sizeof(errno));
_exit(errno);
}
assert(false);
_exit(errno);
}
/* Parent */
close(pipe_fds[1]);
int _errno;
static_assert(sizeof(_errno) == sizeof(errno), "errno size mismatch");
ssize_t ret = read(pipe_fds[0], &_errno, sizeof(_errno));
close(pipe_fds[0]);
if (ret == 0)
_exit(0);
else if (ret < 0)
LOG_ERRNO("failed to read from pipe");
else {
LOG_ERRNO_P("%s: failed to spawn new terminal", _errno, term->foot_exe);
errno = _errno;
waitpid(pid2, NULL, 0);
}
err:
if (pipe_fds[0] != -1)
close(pipe_fds[0]);
_exit(errno);
}
int result;
waitpid(pid, &result, 0);
return WIFEXITED(result) && WEXITSTATUS(result) == 0;
}
void
term_enable_app_sync_updates(struct terminal *term)
{
term->render.app_sync_updates.enabled = true;
if (timerfd_settime(
term->render.app_sync_updates.timer_fd, 0,
&(struct itimerspec){.it_value = {.tv_sec = 1}}, NULL) < 0)
{
LOG_ERR("failed to arm timer for application synchronized updates");
}
/* Disarm delayed rendering timers */
timerfd_settime(
term->delayed_render_timer.lower_fd, 0,
&(struct itimerspec){{0}}, NULL);
timerfd_settime(
term->delayed_render_timer.upper_fd, 0,
&(struct itimerspec){{0}}, NULL);
}
void
term_disable_app_sync_updates(struct terminal *term)
{
if (!term->render.app_sync_updates.enabled)
return;
term->render.app_sync_updates.enabled = false;
/* Reset timers */
timerfd_settime(
term->render.app_sync_updates.timer_fd, 0,
&(struct itimerspec){{0}}, NULL);
}
static inline void
print_linewrap(struct terminal *term)
{
if (likely(!term->cursor.lcf)) {
/* Not and end of line */
return;
}
if (unlikely(!term->auto_margin)) {
/* Auto-wrap disabled */
return;
}
if (term->cursor.point.row == term->scroll_region.end - 1) {
term_scroll(term, 1);
term_cursor_to(term, term->cursor.point.row, 0);
} else
term_cursor_to(term, min(term->cursor.point.row + 1, term->rows - 1), 0);
}
static inline void
print_insert(struct terminal *term, int width)
{
assert(width > 0);
if (unlikely(term->insert_mode)) {
struct row *row = term->grid->cur_row;
const size_t move_count = max(0, term->cols - term->cursor.point.col - width);
memmove(
&row->cells[term->cursor.point.col + width],
&row->cells[term->cursor.point.col],
move_count * sizeof(struct cell));
/* Mark moved cells as dirty */
for (size_t i = term->cursor.point.col + width; i < term->cols; i++)
row->cells[i].attrs.clean = 0;
}
}
void
term_print(struct terminal *term, wchar_t wc, int width)
{
if (unlikely(width <= 0))
return;
print_linewrap(term);
print_insert(term, width);
sixel_delete_at_cursor(term);
/* *Must* get current cell *after* linewrap+insert */
struct row *row = term->grid->cur_row;
struct cell *cell = &row->cells[term->cursor.point.col];
cell->wc = term->vt.last_printed = wc;
cell->attrs = term->vt.attrs;
row->dirty = true;
cell->attrs.clean = 0;
/* Advance cursor the 'additional' columns while dirty:ing the cells */
for (int i = 1; i < width && term->cursor.point.col < term->cols - 1; i++) {
term_cursor_right(term, 1);
assert(term->cursor.point.col < term->cols);
struct cell *cell = &row->cells[term->cursor.point.col];
cell->wc = 0;
cell->attrs.clean = 0;
}
/* Advance cursor */
if (term->cursor.point.col < term->cols - 1)
term_cursor_right(term, 1);
else
term->cursor.lcf = true;
}
enum term_surface
term_surface_kind(const struct terminal *term, const struct wl_surface *surface)
{
if (surface == term->window->surface)
return TERM_SURF_GRID;
else if (surface == term->window->search_surface)
return TERM_SURF_SEARCH;
else if (surface == term->window->csd.surface[CSD_SURF_TITLE])
return TERM_SURF_TITLE;
else if (surface == term->window->csd.surface[CSD_SURF_LEFT])
return TERM_SURF_BORDER_LEFT;
else if (surface == term->window->csd.surface[CSD_SURF_RIGHT])
return TERM_SURF_BORDER_RIGHT;
else if (surface == term->window->csd.surface[CSD_SURF_TOP])
return TERM_SURF_BORDER_TOP;
else if (surface == term->window->csd.surface[CSD_SURF_BOTTOM])
return TERM_SURF_BORDER_BOTTOM;
else if (surface == term->window->csd.surface[CSD_SURF_MINIMIZE])
return TERM_SURF_BUTTON_MINIMIZE;
else if (surface == term->window->csd.surface[CSD_SURF_MAXIMIZE])
return TERM_SURF_BUTTON_MAXIMIZE;
else if (surface == term->window->csd.surface[CSD_SURF_CLOSE])
return TERM_SURF_BUTTON_CLOSE;
else
return TERM_SURF_NONE;
}
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