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wayland: Optimize keyboard_handle_modifiers. 

1. Mod index values are (mostly) constant, so can be done with xkb_state_new
2. Mods can change without the group changing, avoid remap events if possible

Lastly, as a bonus, I added braces to the locale check, because I was nearby.
This commit is contained in:
Ethan Lee 2022-03-25 12:51:38 -04:00
parent 69d0b6e3c6
commit 7a1c45bd1c
2 changed files with 41 additions and 17 deletions
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47
src/video/wayland/SDL_waylandevents.c
View File

@ -817,6 +817,16 @@ keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
return;
}
#define GET_MOD_INDEX(mod) \
WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_##mod)
input->xkb.idx_shift = 1 << GET_MOD_INDEX(SHIFT);
input->xkb.idx_ctrl = 1 << GET_MOD_INDEX(CTRL);
input->xkb.idx_alt = 1 << GET_MOD_INDEX(ALT);
input->xkb.idx_gui = 1 << GET_MOD_INDEX(LOGO);
input->xkb.idx_num = 1 << GET_MOD_INDEX(NUM);
input->xkb.idx_caps = 1 << GET_MOD_INDEX(CAPS);
#undef GET_MOD_INDEX
input->xkb.state = WAYLAND_xkb_state_new(input->xkb.keymap);
if (!input->xkb.state) {
fprintf(stderr, "failed to create XKB state\n");
@ -831,10 +841,14 @@ keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
*/
/* Look up the preferred locale, falling back to "C" as default */
if (!(locale = SDL_getenv("LC_ALL")))
if (!(locale = SDL_getenv("LC_CTYPE")))
if (!(locale = SDL_getenv("LANG")))
if (!(locale = SDL_getenv("LC_ALL"))) {
if (!(locale = SDL_getenv("LC_CTYPE"))) {
if (!(locale = SDL_getenv("LANG"))) {
locale = "C";
}
}
}
/* Set up XKB compose table */
input->xkb.compose_table = WAYLAND_xkb_compose_table_new_from_locale(input->display->xkb_context,
locale, XKB_COMPOSE_COMPILE_NO_FLAGS);
@ -1056,26 +1070,24 @@ keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
{
struct SDL_WaylandInput *input = data;
Wayland_Keymap keymap;
xkb_mod_index_t shift, ctrl, alt, gui, num, caps;
uint32_t modstate = (mods_depressed | mods_latched | mods_locked);
shift = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_SHIFT);
ctrl = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_CTRL);
alt = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_ALT);
gui = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_LOGO);
num = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_NUM);
caps = WAYLAND_xkb_keymap_mod_get_index(input->xkb.keymap, XKB_MOD_NAME_CAPS);
WAYLAND_xkb_state_update_mask(input->xkb.state, mods_depressed, mods_latched,
mods_locked, 0, 0, group);
SDL_ToggleModState(KMOD_SHIFT, modstate & (1 << shift));
SDL_ToggleModState(KMOD_CTRL, modstate & (1 << ctrl));
SDL_ToggleModState(KMOD_CAPS, modstate & (1 << alt));
SDL_ToggleModState(KMOD_GUI, modstate & (1 << gui));
SDL_ToggleModState(KMOD_NUM, modstate & (1 << num));
SDL_ToggleModState(KMOD_CAPS, modstate & (1 << caps));
SDL_ToggleModState(KMOD_SHIFT, modstate & input->xkb.idx_shift);
SDL_ToggleModState(KMOD_CTRL, modstate & input->xkb.idx_ctrl);
SDL_ToggleModState(KMOD_ALT, modstate & input->xkb.idx_alt);
SDL_ToggleModState(KMOD_GUI, modstate & input->xkb.idx_gui);
SDL_ToggleModState(KMOD_NUM, modstate & input->xkb.idx_num);
SDL_ToggleModState(KMOD_CAPS, modstate & input->xkb.idx_caps);
if (group == input->xkb.current_group) {
return;
}
/* The layout changed, remap and fire an event */
input->xkb.current_group = group;
keymap.layout = group;
SDL_GetDefaultKeymap(keymap.keymap);
WAYLAND_xkb_keymap_key_for_each(input->xkb.keymap,
@ -2032,6 +2044,7 @@ Wayland_display_add_input(SDL_VideoData *d, uint32_t id, uint32_t version)
input->seat = wl_registry_bind(d->registry, id, &wl_seat_interface, SDL_min(5, version));
input->sx_w = wl_fixed_from_int(0);
input->sy_w = wl_fixed_from_int(0);
input->xkb.current_group = ~0;
d->input = input;
if (d->data_device_manager != NULL) {

11
src/video/wayland/SDL_waylandevents_c.h
View File

@ -96,6 +96,17 @@ struct SDL_WaylandInput {
struct xkb_state *state;
struct xkb_compose_table *compose_table;
struct xkb_compose_state *compose_state;
/* Keyboard layout "group" */
uint32_t current_group;
/* Modifier bitshift values */
uint32_t idx_shift;
uint32_t idx_ctrl;
uint32_t idx_alt;
uint32_t idx_gui;
uint32_t idx_num;
uint32_t idx_caps;
} xkb;
/* information about axis events on current frame */