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flash: implement 'flash'

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Use our own escape sequence for the 'flash' terminfo entry.

Implemented by arming a timer FD and setting a boolean that indicates
we're currently "flashing".

The renderer draws a semi-transparent yellowish layer over the entire
window when "flashing" is active.
This commit is contained in:
Daniel Eklöf 2019-07-21 19:14:19 +02:00
parent 1ff04c5e36
commit 0dd8951cb3
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GPG key ID: 5BBD4992C116573F
5 changed files with 84 additions and 22 deletions
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24
main.c
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@ -10,6 +10,8 @@
#include <poll.h>
#include <errno.h>
#include <sys/timerfd.h>
#include <freetype/tttables.h>
#include <cairo-ft.h>
#include <wayland-client.h>
@ -325,6 +327,7 @@ main(int argc, char *const *argv)
.keypad_keys_mode = KEYPAD_NUMERICAL,
.auto_margin = true,
.window_title_stack = tll_init(),
.flash_timer_fd = timerfd_create(CLOCK_BOOTTIME, TFD_CLOEXEC),
.vt = {
.state = 1, /* STATE_GROUND */
.attrs = {
@ -681,6 +684,7 @@ main(int argc, char *const *argv)
{.fd = wl_display_get_fd(term.wl.display), .events = POLLIN},
{.fd = term.ptmx, .events = POLLIN},
{.fd = term.kbd.repeat.pipe_read_fd, .events = POLLIN},
{.fd = term.flash_timer_fd, .events = POLLIN},
};
wl_display_flush(term.wl.display);
@ -775,6 +779,23 @@ main(int argc, char *const *argv)
if (fds[2].revents & POLLHUP)
LOG_ERR("keyboard repeat handling thread died");
if (fds[3].revents & POLLIN) {
uint64_t expiration_count;
ssize_t ret = read(
term.flash_timer_fd, &expiration_count, sizeof(expiration_count));
if (ret < 0)
LOG_ERRNO("failed to read flash timer");
else
LOG_DBG("flash timer expired %llu times",
(unsigned long long)expiration_count);
term.flash_active = false;
term_damage_view(&term);
if (term.frame_callback == NULL)
grid_render(&term);
}
}
out:
@ -862,6 +883,9 @@ out:
cairo_glyph_free(f->glyph_cache[j].glyphs);
}
if (term.flash_timer_fd != -1)
close(term.flash_timer_fd);
if (term.ptmx != -1)
close(term.ptmx);