wlroots/types/wlr_keyboard.c

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#include <assert.h>
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#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
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#include <wayland-server.h>
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#include <wlr/interfaces/wlr_keyboard.h>
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#include <wlr/types/wlr_keyboard.h>
#include <wlr/util/log.h>
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#include "util/signal.h"
int os_create_anonymous_file(off_t size);
static void keyboard_led_update(struct wlr_keyboard *keyboard) {
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if (keyboard->xkb_state == NULL) {
return;
}
uint32_t leds = 0;
for (uint32_t i = 0; i < WLR_LED_COUNT; ++i) {
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if (xkb_state_led_index_is_active(keyboard->xkb_state,
keyboard->led_indexes[i])) {
leds |= (1 << i);
}
}
wlr_keyboard_led_update(keyboard, leds);
}
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/**
* Update the modifier state of the wlr-keyboard. Returns true if the modifier
* state changed.
*/
static bool keyboard_modifier_update(struct wlr_keyboard *keyboard) {
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if (keyboard->xkb_state == NULL) {
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return false;
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}
xkb_mod_mask_t depressed = xkb_state_serialize_mods(keyboard->xkb_state,
XKB_STATE_MODS_DEPRESSED);
xkb_mod_mask_t latched = xkb_state_serialize_mods(keyboard->xkb_state,
XKB_STATE_MODS_LATCHED);
xkb_mod_mask_t locked = xkb_state_serialize_mods(keyboard->xkb_state,
XKB_STATE_MODS_LOCKED);
xkb_mod_mask_t group = xkb_state_serialize_layout(keyboard->xkb_state,
XKB_STATE_LAYOUT_EFFECTIVE);
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if (depressed == keyboard->modifiers.depressed &&
latched == keyboard->modifiers.latched &&
locked == keyboard->modifiers.locked &&
group == keyboard->modifiers.group) {
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return false;
}
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keyboard->modifiers.depressed = depressed;
keyboard->modifiers.latched = latched;
keyboard->modifiers.locked = locked;
keyboard->modifiers.group = group;
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return true;
}
// https://www.geeksforgeeks.org/move-zeroes-end-array/
static size_t push_zeroes_to_end(uint32_t arr[], size_t n) {
size_t count = 0;
for (size_t i = 0; i < n; i++) {
if (arr[i] != 0) {
arr[count++] = arr[i];
}
}
size_t ret = count;
while (count < n) {
arr[count++] = 0;
}
return ret;
}
static void keyboard_key_update(struct wlr_keyboard *keyboard,
struct wlr_event_keyboard_key *event) {
bool found = false;
size_t i = 0;
for (; i < keyboard->num_keycodes; ++i) {
if (keyboard->keycodes[i] == event->keycode) {
found = true;
break;
}
}
if (event->state == WLR_KEY_PRESSED && !found &&
keyboard->num_keycodes < WLR_KEYBOARD_KEYS_CAP) {
keyboard->keycodes[keyboard->num_keycodes++] = event->keycode;
}
if (event->state == WLR_KEY_RELEASED && found) {
keyboard->keycodes[i] = 0;
keyboard->num_keycodes = push_zeroes_to_end(keyboard->keycodes, WLR_KEYBOARD_KEYS_CAP);
}
assert(keyboard->num_keycodes <= WLR_KEYBOARD_KEYS_CAP);
}
void wlr_keyboard_notify_modifiers(struct wlr_keyboard *keyboard,
uint32_t mods_depressed, uint32_t mods_latched, uint32_t mods_locked,
uint32_t group) {
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if (keyboard->xkb_state == NULL) {
return;
}
xkb_state_update_mask(keyboard->xkb_state, mods_depressed, mods_latched,
mods_locked, 0, 0, group);
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bool updated = keyboard_modifier_update(keyboard);
if (updated) {
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wlr_signal_emit_safe(&keyboard->events.modifiers, keyboard);
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}
}
void wlr_keyboard_notify_key(struct wlr_keyboard *keyboard,
struct wlr_event_keyboard_key *event) {
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if (keyboard->xkb_state == NULL) {
return;
}
keyboard_key_update(keyboard, event);
wlr_signal_emit_safe(&keyboard->events.key, event);
if (event->update_state) {
uint32_t keycode = event->keycode + 8;
xkb_state_update_key(keyboard->xkb_state, keycode,
event->state == WLR_KEY_PRESSED ? XKB_KEY_DOWN : XKB_KEY_UP);
}
keyboard_led_update(keyboard);
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bool updated = keyboard_modifier_update(keyboard);
if (updated) {
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wlr_signal_emit_safe(&keyboard->events.modifiers, keyboard);
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}
}
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void wlr_keyboard_init(struct wlr_keyboard *kb,
struct wlr_keyboard_impl *impl) {
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kb->impl = impl;
wl_signal_init(&kb->events.key);
wl_signal_init(&kb->events.modifiers);
wl_signal_init(&kb->events.keymap);
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wl_signal_init(&kb->events.repeat_info);
// Sane defaults
kb->repeat_info.rate = 25;
kb->repeat_info.delay = 600;
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}
void wlr_keyboard_destroy(struct wlr_keyboard *kb) {
if (kb == NULL) {
return;
}
xkb_state_unref(kb->xkb_state);
xkb_keymap_unref(kb->keymap);
close(kb->keymap_fd);
if (kb->impl && kb->impl->destroy) {
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kb->impl->destroy(kb);
} else {
wl_list_remove(&kb->events.key.listener_list);
free(kb);
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}
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}
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void wlr_keyboard_led_update(struct wlr_keyboard *kb, uint32_t leds) {
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if (kb->impl && kb->impl->led_update) {
kb->impl->led_update(kb, leds);
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}
}
void wlr_keyboard_set_keymap(struct wlr_keyboard *kb,
struct xkb_keymap *keymap) {
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char *keymap_str = NULL;
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xkb_keymap_unref(kb->keymap);
kb->keymap = xkb_keymap_ref(keymap);
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xkb_state_unref(kb->xkb_state);
kb->xkb_state = xkb_state_new(kb->keymap);
if (kb->xkb_state == NULL) {
wlr_log(L_ERROR, "Failed to create XKB state");
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goto err;
}
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const char *led_names[WLR_LED_COUNT] = {
XKB_LED_NAME_NUM,
XKB_LED_NAME_CAPS,
XKB_LED_NAME_SCROLL,
};
for (size_t i = 0; i < WLR_LED_COUNT; ++i) {
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kb->led_indexes[i] = xkb_map_led_get_index(kb->keymap, led_names[i]);
}
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const char *mod_names[WLR_MODIFIER_COUNT] = {
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XKB_MOD_NAME_SHIFT,
XKB_MOD_NAME_CAPS,
XKB_MOD_NAME_CTRL, // "Control"
XKB_MOD_NAME_ALT, // "Mod1"
XKB_MOD_NAME_NUM, // "Mod2"
"Mod3",
XKB_MOD_NAME_LOGO, // "Mod4"
"Mod5",
};
// TODO: there's also "Ctrl", "Alt"?
for (size_t i = 0; i < WLR_MODIFIER_COUNT; ++i) {
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kb->mod_indexes[i] = xkb_map_mod_get_index(kb->keymap, mod_names[i]);
}
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keymap_str = xkb_keymap_get_as_string(kb->keymap,
XKB_KEYMAP_FORMAT_TEXT_V1);
kb->keymap_size = strlen(keymap_str) + 1;
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if (kb->keymap_fd) {
close(kb->keymap_fd);
}
kb->keymap_fd = os_create_anonymous_file(kb->keymap_size);
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if (kb->keymap_fd < 0) {
wlr_log(L_ERROR, "creating a keymap file for %zu bytes failed", kb->keymap_size);
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goto err;
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}
void *ptr = mmap(NULL, kb->keymap_size,
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PROT_READ | PROT_WRITE, MAP_SHARED, kb->keymap_fd, 0);
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if (ptr == (void*)-1) {
wlr_log(L_ERROR, "failed to mmap() %zu bytes", kb->keymap_size);
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goto err;
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}
strcpy(ptr, keymap_str);
free(keymap_str);
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for (size_t i = 0; i < kb->num_keycodes; ++i) {
xkb_keycode_t keycode = kb->keycodes[i] + 8;
xkb_state_update_key(kb->xkb_state, keycode, XKB_KEY_DOWN);
}
keyboard_modifier_update(kb);
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wlr_signal_emit_safe(&kb->events.keymap, kb);
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return;
err:
xkb_state_unref(kb->xkb_state);
kb->xkb_state = NULL;
xkb_keymap_unref(keymap);
kb->keymap = NULL;
close(kb->keymap_fd);
free(keymap_str);
}
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void wlr_keyboard_set_repeat_info(struct wlr_keyboard *kb, int32_t rate,
int32_t delay) {
if (kb->repeat_info.rate == rate && kb->repeat_info.delay == delay) {
return;
}
kb->repeat_info.rate = rate;
kb->repeat_info.delay = delay;
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wlr_signal_emit_safe(&kb->events.repeat_info, kb);
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}
uint32_t wlr_keyboard_get_modifiers(struct wlr_keyboard *kb) {
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xkb_mod_mask_t mask = kb->modifiers.depressed | kb->modifiers.latched;
uint32_t modifiers = 0;
for (size_t i = 0; i < WLR_MODIFIER_COUNT; ++i) {
if (kb->mod_indexes[i] != XKB_MOD_INVALID &&
(mask & (1 << kb->mod_indexes[i]))) {
modifiers |= (1 << i);
}
}
return modifiers;
}