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foot/main.c
Daniel Eklöf ccf625b991
render: gamma-correct blending 
This implements gamma-correct blending, which mainly affects font
rendering.

The implementation requires compile-time availability of the new
color-management protocol (available in wayland-protocols >= 1.41),
and run-time support for the same in the compositor (specifically, the
EXT_LINEAR TF function and sRGB primaries).

How it works: all colors are decoded from sRGB to linear (using a
lookup table, generated in the exact same way pixman generates it's
internal conversion tables) before being used by pixman. The resulting
image buffer is thus in decoded/linear format. We use the
color-management protocol to inform the compositor of this, by tagging
the wayland surfaces with the 'ext_linear' image attribute.

Sixes: all colors are sRGB internally, and decoded to linear before
being used in any sixels. Thus, the image buffers will contain linear
colors. This is important, since otherwise there would be a
decode/encode penalty every time a sixel is blended to the grid.

Emojis: we require fcft >= 3.2, which adds support for sRGB decoding
color glyphs. Meaning, the emoji pixman surfaces can be blended
directly to the grid, just like sixels.

Gamma-correct blending is enabled by default *when the compositor
supports it*. There's a new option to explicitly enable/disable it:
gamma-correct-blending=no|yes. If set to 'yes', and the compositor
does not implement the required color-management features, warning
logs are emitted.

There's a loss of precision when storing linear pixels in 8-bit
channels. For this reason, this patch also adds supports for 10-bit
surfaces. For now, this is disabled by default since such surfaces
only have 2 bits for alpha. It can be enabled with
tweak.surface-bit-depth=10-bit.

Perhaps, in the future, we can enable it by default if:

* gamma-correct blending is enabled
* the user has not enabled a transparent background
2025-03-05 18:45:01 +01:00

697 lines
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <limits.h>
#include <locale.h>
#include <getopt.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <fcft/fcft.h>
#define LOG_MODULE "main"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "config.h"
#include "fdm.h"
#include "foot-features.h"
#include "key-binding.h"
#include "macros.h"
#include "reaper.h"
#include "render.h"
#include "server.h"
#include "shm.h"
#include "terminal.h"
#include "util.h"
#include "version.h"
#include "xmalloc.h"
#include "xsnprintf.h"
#if !defined(__STDC_UTF_32__) || !__STDC_UTF_32__
#error "char32_t does not use UTF-32"
#endif
static bool
fdm_sigint(struct fdm *fdm, int signo, void *data)
{
*(volatile sig_atomic_t *)data = true;
return true;
}
static const char *
version_and_features(void)
{
static char buf[256];
snprintf(buf, sizeof(buf),
"version: %s %cpgo %cime %cgraphemes %ctoplevel-icon %csystem-bell %ccolor-management %cassertions",
FOOT_VERSION,
feature_pgo() ? '+' : '-',
feature_ime() ? '+' : '-',
feature_graphemes() ? '+' : '-',
feature_xdg_toplevel_icon() ? '+' : '-',
feature_xdg_system_bell() ? '+' : '-',
feature_wp_color_management() ? '+' : '-',
feature_assertions() ? '+' : '-');
return buf;
}
static void
print_usage(const char *prog_name)
{
static const char options[] =
"\nOptions:\n"
" -c,--config=PATH load configuration from PATH ($XDG_CONFIG_HOME/foot/foot.ini)\n"
" -C,--check-config verify configuration, exit with 0 if ok, otherwise exit with 1\n"
" -o,--override=[section.]key=value override configuration option\n"
" -f,--font=FONT comma separated list of fonts in fontconfig format (monospace)\n"
" -t,--term=TERM value to set the environment variable TERM to (" FOOT_DEFAULT_TERM ")\n"
" -T,--title=TITLE initial window title (foot)\n"
" -a,--app-id=ID window application ID (foot)\n"
" -m,--maximized start in maximized mode\n"
" -F,--fullscreen start in fullscreen mode\n"
" -L,--login-shell start shell as a login shell\n"
" --pty=PATH display an existing PTY instead of creating one\n"
" -D,--working-directory=DIR directory to start in (CWD)\n"
" -w,--window-size-pixels=WIDTHxHEIGHT initial width and height, in pixels\n"
" -W,--window-size-chars=WIDTHxHEIGHT initial width and height, in characters\n"
" -s,--server[=PATH] run as a server (use 'footclient' to start terminals).\n"
" Without PATH, $XDG_RUNTIME_DIR/foot-$WAYLAND_DISPLAY.sock will be used.\n"
" -H,--hold remain open after child process exits\n"
" -p,--print-pid=FILE|FD print PID to file or FD (only applicable in server mode)\n"
" -d,--log-level={info|warning|error|none} log level (warning)\n"
" -l,--log-colorize=[{never|always|auto}] enable/disable colorization of log output on stderr\n"
" -S,--log-no-syslog disable syslog logging (only applicable in server mode)\n"
" -v,--version show the version number and quit\n"
" -e ignored (for compatibility with xterm -e)\n";
printf("Usage: %s [OPTIONS...]\n", prog_name);
printf("Usage: %s [OPTIONS...] command [ARGS...]\n", prog_name);
puts(options);
}
bool
locale_is_utf8(void)
{
static const char u8[] = u8"ö";
xassert(strlen(u8) == 2);
char32_t w;
if (mbrtoc32(&w, u8, 2, &(mbstate_t){0}) != 2)
return false;
return w == U'ö';
}
struct shutdown_context {
struct terminal **term;
int exit_code;
};
static void
term_shutdown_cb(void *data, int exit_code)
{
struct shutdown_context *ctx = data;
*ctx->term = NULL;
ctx->exit_code = exit_code;
}
static bool
print_pid(const char *pid_file, bool *unlink_at_exit)
{
LOG_DBG("printing PID to %s", pid_file);
errno = 0;
char *end;
int pid_fd = strtoul(pid_file, &end, 10);
if (errno != 0 || *end != '\0') {
if ((pid_fd = open(pid_file,
O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < 0) {
LOG_ERRNO("%s: failed to open", pid_file);
return false;
} else
*unlink_at_exit = true;
}
if (pid_fd >= 0) {
char pid[32];
size_t n = xsnprintf(pid, sizeof(pid), "%u\n", getpid());
ssize_t bytes = write(pid_fd, pid, n);
close(pid_fd);
if (bytes < 0) {
LOG_ERRNO("failed to write PID to FD=%u", pid_fd);
return false;
}
LOG_DBG("wrote %zd bytes to FD=%d", bytes, pid_fd);
return true;
} else
return false;
}
static void
sanitize_signals(void)
{
sigset_t mask;
sigemptyset(&mask);
sigprocmask(SIG_SETMASK, &mask, NULL);
struct sigaction dfl = {.sa_handler = SIG_DFL};
sigemptyset(&dfl.sa_mask);
for (int i = 1; i < SIGRTMAX; i++)
sigaction(i, &dfl, NULL);
}
enum {
PTY_OPTION = CHAR_MAX + 1,
};
int
main(int argc, char *const *argv)
{
/* Custom exit code, to enable users to differentiate between foot
* itself failing, and the client application failing */
static const int foot_exit_failure = -26;
int ret = foot_exit_failure;
sanitize_signals();
/* XDG startup notifications */
const char *token = getenv("XDG_ACTIVATION_TOKEN");
unsetenv("XDG_ACTIVATION_TOKEN");
/* Startup notifications; we don't support it, but must ensure we
* don't pass this on to programs launched by us */
unsetenv("DESKTOP_STARTUP_ID");
const char *const prog_name = argc > 0 ? argv[0] : "<nullptr>";
static const struct option longopts[] = {
{"config", required_argument, NULL, 'c'},
{"check-config", no_argument, NULL, 'C'},
{"override", required_argument, NULL, 'o'},
{"term", required_argument, NULL, 't'},
{"title", required_argument, NULL, 'T'},
{"app-id", required_argument, NULL, 'a'},
{"login-shell", no_argument, NULL, 'L'},
{"working-directory", required_argument, NULL, 'D'},
{"font", required_argument, NULL, 'f'},
{"window-size-pixels", required_argument, NULL, 'w'},
{"window-size-chars", required_argument, NULL, 'W'},
{"server", optional_argument, NULL, 's'},
{"hold", no_argument, NULL, 'H'},
{"maximized", no_argument, NULL, 'm'},
{"fullscreen", no_argument, NULL, 'F'},
{"presentation-timings", no_argument, NULL, 'P'}, /* Undocumented */
{"pty", required_argument, NULL, PTY_OPTION},
{"print-pid", required_argument, NULL, 'p'},
{"log-level", required_argument, NULL, 'd'},
{"log-colorize", optional_argument, NULL, 'l'},
{"log-no-syslog", no_argument, NULL, 'S'},
{"version", no_argument, NULL, 'v'},
{"help", no_argument, NULL, 'h'},
{NULL, no_argument, NULL, 0},
};
bool check_config = false;
const char *conf_path = NULL;
const char *custom_cwd = NULL;
const char *pty_path = NULL;
bool as_server = false;
const char *conf_server_socket_path = NULL;
bool presentation_timings = false;
bool hold = false;
bool unlink_pid_file = false;
const char *pid_file = NULL;
enum log_class log_level = LOG_CLASS_WARNING;
enum log_colorize log_colorize = LOG_COLORIZE_AUTO;
bool log_syslog = true;
user_notifications_t user_notifications = tll_init();
config_override_t overrides = tll_init();
while (true) {
int c = getopt_long(argc, argv, "+c:Co:t:T:a:LD:f:w:W:s::HmFPp:d:l::Sveh", longopts, NULL);
if (c == -1)
break;
switch (c) {
case 'c':
conf_path = optarg;
break;
case 'C':
check_config = true;
break;
case 'o':
tll_push_back(overrides, xstrdup(optarg));
break;
case 't':
tll_push_back(overrides, xstrjoin("term=", optarg));
break;
case 'L':
tll_push_back(overrides, xstrdup("login-shell=yes"));
break;
case 'T':
tll_push_back(overrides, xstrjoin("title=", optarg));
break;
case 'a':
tll_push_back(overrides, xstrjoin("app-id=", optarg));
break;
case 'D': {
struct stat st;
if (stat(optarg, &st) < 0 || !(st.st_mode & S_IFDIR)) {
fprintf(stderr, "error: %s: not a directory\n", optarg);
return ret;
}
custom_cwd = optarg;
break;
}
case 'f': {
char *font_override = xstrjoin("font=", optarg);
tll_push_back(overrides, font_override);
break;
}
case 'w': {
unsigned width, height;
if (sscanf(optarg, "%ux%u", &width, &height) != 2 || width == 0 || height == 0) {
fprintf(stderr, "error: invalid window-size-pixels: %s\n", optarg);
return ret;
}
tll_push_back(
overrides, xasprintf("initial-window-size-pixels=%ux%u",
width, height));
break;
}
case 'W': {
unsigned width, height;
if (sscanf(optarg, "%ux%u", &width, &height) != 2 || width == 0 || height == 0) {
fprintf(stderr, "error: invalid window-size-chars: %s\n", optarg);
return ret;
}
tll_push_back(
overrides, xasprintf("initial-window-size-chars=%ux%u",
width, height));
break;
}
case 's':
as_server = true;
if (optarg != NULL)
conf_server_socket_path = optarg;
break;
case PTY_OPTION:
pty_path = optarg;
break;
case 'P':
presentation_timings = true;
break;
case 'H':
hold = true;
break;
case 'm':
tll_push_back(overrides, xstrdup("initial-window-mode=maximized"));
break;
case 'F':
tll_push_back(overrides, xstrdup("initial-window-mode=fullscreen"));
break;
case 'p':
pid_file = optarg;
break;
case 'd': {
int lvl = log_level_from_string(optarg);
if (unlikely(lvl < 0)) {
fprintf(
stderr,
"-d,--log-level: %s: argument must be one of %s\n",
optarg,
log_level_string_hint());
return ret;
}
log_level = lvl;
break;
}
case 'l':
if (optarg == NULL || streq(optarg, "auto"))
log_colorize = LOG_COLORIZE_AUTO;
else if (streq(optarg, "never"))
log_colorize = LOG_COLORIZE_NEVER;
else if (streq(optarg, "always"))
log_colorize = LOG_COLORIZE_ALWAYS;
else {
fprintf(stderr, "%s: argument must be one of 'never', 'always' or 'auto'\n", optarg);
return ret;
}
break;
case 'S':
log_syslog = false;
break;
case 'v':
printf("foot %s\n", version_and_features());
return EXIT_SUCCESS;
case 'h':
print_usage(prog_name);
return EXIT_SUCCESS;
case 'e':
break;
case '?':
return ret;
}
}
if (as_server && pty_path) {
fputs("error: --pty is incompatible with server mode\n", stderr);
return ret;
}
log_init(log_colorize, as_server && log_syslog,
as_server ? LOG_FACILITY_DAEMON : LOG_FACILITY_USER, log_level);
if (argc > 0) {
argc -= optind;
argv += optind;
}
LOG_INFO("%s", version_and_features());
{
struct utsname name;
if (uname(&name) < 0)
LOG_ERRNO("uname() failed");
else
LOG_INFO("arch: %s %s/%zu-bit",
name.sysname, name.machine, sizeof(void *) * 8);
}
srand(time(NULL));
const char *locale = setlocale(LC_CTYPE, "");
if (locale == NULL) {
/*
* If the user has configured an invalid locale, or a name of a locale
* that does not exist on this system, then the above call may return
* NULL. We should just continue with the fallback method below.
*/
LOG_ERR("setlocale() failed. The most common cause is that the "
"configured locale is not available, or has been misspelled");
}
LOG_INFO("locale: %s", locale != NULL ? locale : "<invalid>");
bool bad_locale = locale == NULL || !locale_is_utf8();
if (bad_locale) {
static const char fallback_locales[][12] = {
"C.UTF-8",
"en_US.UTF-8",
};
char *saved_locale = locale != NULL ? xstrdup(locale) : NULL;
/*
* Try to force an UTF-8 locale. If we succeed, launch the
* user's shell as usual, but add a user-notification saying
* the locale has been changed.
*/
for (size_t i = 0; i < ALEN(fallback_locales); i++) {
const char *const fallback_locale = fallback_locales[i];
if (setlocale(LC_CTYPE, fallback_locale) != NULL) {
if (saved_locale != NULL) {
LOG_WARN(
"'%s' is not a UTF-8 locale, falling back to '%s'",
saved_locale, fallback_locale);
user_notification_add_fmt(
&user_notifications, USER_NOTIFICATION_WARNING,
"'%s' is not a UTF-8 locale, falling back to '%s'",
saved_locale, fallback_locale);
} else {
LOG_WARN(
"invalid locale, falling back to '%s'", fallback_locale);
user_notification_add_fmt(
&user_notifications, USER_NOTIFICATION_WARNING,
"invalid locale, falling back to '%s'", fallback_locale);
}
bad_locale = false;
break;
}
}
if (bad_locale) {
if (saved_locale != NULL) {
LOG_ERR(
"'%s' is not a UTF-8 locale, and failed to find a fallback",
saved_locale);
user_notification_add_fmt(
&user_notifications, USER_NOTIFICATION_ERROR,
"'%s' is not a UTF-8 locale, and failed to find a fallback",
saved_locale);
} else {
LOG_ERR("invalid locale, and failed to find a fallback");
user_notification_add_fmt(
&user_notifications, USER_NOTIFICATION_ERROR,
"invalid locale, and failed to find a fallback");
}
}
free(saved_locale);
}
struct config conf = {NULL};
bool conf_successful = config_load(
&conf, conf_path, &user_notifications, &overrides, check_config, as_server);
tll_free_and_free(overrides, free);
if (!conf_successful) {
config_free(&conf);
return ret;
}
if (check_config) {
config_free(&conf);
return EXIT_SUCCESS;
}
_Static_assert((int)LOG_CLASS_ERROR == (int)FCFT_LOG_CLASS_ERROR,
"fcft log level enum offset");
_Static_assert((int)LOG_COLORIZE_ALWAYS == (int)FCFT_LOG_COLORIZE_ALWAYS,
"fcft colorize enum mismatch");
fcft_init(
(enum fcft_log_colorize)log_colorize,
as_server && log_syslog,
(enum fcft_log_class)log_level);
fcft_set_scaling_filter(conf.tweak.fcft_filter);
if (conf_server_socket_path != NULL) {
free(conf.server_socket_path);
conf.server_socket_path = xstrdup(conf_server_socket_path);
}
conf.presentation_timings = presentation_timings;
conf.hold_at_exit = hold;
if (conf.tweak.font_monospace_warn && conf.fonts[0].count > 0) {
check_if_font_is_monospaced(
conf.fonts[0].arr[0].pattern, &conf.notifications);
}
if (bad_locale) {
static char *const bad_locale_fake_argv[] = {"/bin/sh", "-c", "", NULL};
argc = 1;
argv = bad_locale_fake_argv;
conf.hold_at_exit = true;
}
struct fdm *fdm = NULL;
struct reaper *reaper = NULL;
struct key_binding_manager *key_binding_manager = NULL;
struct wayland *wayl = NULL;
struct renderer *renderer = NULL;
struct terminal *term = NULL;
struct server *server = NULL;
struct shutdown_context shutdown_ctx = {.term = &term, .exit_code = foot_exit_failure};
const char *cwd = custom_cwd;
char *_cwd = NULL;
if (cwd == NULL) {
size_t buf_len = 1024;
do {
_cwd = xrealloc(_cwd, buf_len);
errno = 0;
if (getcwd(_cwd, buf_len) == NULL && errno != ERANGE) {
LOG_ERRNO("failed to get current working directory");
goto out;
}
buf_len *= 2;
} while (errno == ERANGE);
cwd = _cwd;
}
const char *pwd = getenv("PWD");
if (pwd != NULL) {
char *resolved_path_cwd = realpath(cwd, NULL);
char *resolved_path_pwd = realpath(pwd, NULL);
if (resolved_path_cwd != NULL &&
resolved_path_pwd != NULL &&
streq(resolved_path_cwd, resolved_path_pwd))
{
/*
* The resolved path of $PWD matches the resolved path of
* the *actual* working directory - use $PWD.
*
* This makes a difference when $PWD refers to a symlink.
*/
cwd = pwd;
}
free(resolved_path_cwd);
free(resolved_path_pwd);
}
shm_set_max_pool_size(conf.tweak.max_shm_pool_size);
if ((fdm = fdm_init()) == NULL)
goto out;
if ((reaper = reaper_init(fdm)) == NULL)
goto out;
if ((key_binding_manager = key_binding_manager_new()) == NULL)
goto out;
if ((wayl = wayl_init(
fdm, key_binding_manager, conf.presentation_timings)) == NULL)
{
goto out;
}
if ((renderer = render_init(fdm, wayl)) == NULL)
goto out;
if (!as_server && (term = term_init(
&conf, fdm, reaper, wayl, "foot", cwd, token, pty_path,
argc, argv, NULL,
&term_shutdown_cb, &shutdown_ctx)) == NULL) {
goto out;
}
free(_cwd);
_cwd = NULL;
if (as_server && (server = server_init(&conf, fdm, reaper, wayl)) == NULL)
goto out;
volatile sig_atomic_t aborted = false;
if (!fdm_signal_add(fdm, SIGINT, &fdm_sigint, (void *)&aborted) ||
!fdm_signal_add(fdm, SIGTERM, &fdm_sigint, (void *)&aborted))
{
goto out;
}
struct sigaction sig_ign = {.sa_handler = SIG_IGN};
sigemptyset(&sig_ign.sa_mask);
if (sigaction(SIGHUP, &sig_ign, NULL) < 0 ||
sigaction(SIGPIPE, &sig_ign, NULL) < 0)
{
LOG_ERRNO("failed to ignore SIGHUP+SIGPIPE");
goto out;
}
if (as_server)
LOG_INFO("running as server; launch terminals by running footclient");
if (as_server && pid_file != NULL) {
if (!print_pid(pid_file, &unlink_pid_file))
goto out;
}
ret = EXIT_SUCCESS;
while (likely(!aborted && (as_server || tll_length(wayl->terms) > 0))) {
if (unlikely(!fdm_poll(fdm))) {
ret = foot_exit_failure;
break;
}
}
out:
free(_cwd);
server_destroy(server);
term_destroy(term);
shm_fini();
render_destroy(renderer);
wayl_destroy(wayl);
key_binding_manager_destroy(key_binding_manager);
reaper_destroy(reaper);
fdm_signal_del(fdm, SIGTERM);
fdm_signal_del(fdm, SIGINT);
fdm_destroy(fdm);
config_free(&conf);
if (unlink_pid_file)
unlink(pid_file);
LOG_INFO("goodbye");
fcft_fini();
log_deinit();
return ret == EXIT_SUCCESS && !as_server ? shutdown_ctx.exit_code : ret;
}
UNITTEST
{
char *s = xstrjoin("foo", "bar");
xassert(streq(s, "foobar"));
free(s);
s = xstrjoin3("foo", " ", "bar");
xassert(streq(s, "foo bar"));
free(s);
s = xstrjoin3("foo", ",", "bar");
xassert(streq(s, "foo,bar"));
free(s);
s = xstrjoin3("foo", "bar", "baz");
xassert(streq(s, "foobarbaz"));
free(s);
}
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