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wayland: Optimize keymap creation

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Iterate over the list of keys only once while assembling all related state for key levels and modifiers.
This commit is contained in:
Frank Praznik
2025-07-09 12:57:14 -04:00
parent 34d9db3657
commit 9b00f3a728
2 changed files with 62 additions and 80 deletions
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133
src/video/wayland/SDL_waylandevents.c
View File

@@ -1410,103 +1410,78 @@ static const struct wl_touch_listener touch_listener = {
touch_handler_orientation // Version 6
};
typedef struct Wayland_KeymapBuilderState
{
SDL_Keymap *keymap;
struct xkb_state *state;
SDL_Keymod modstate;
} Wayland_KeymapBuilderState;
static void Wayland_keymap_iter(struct xkb_keymap *keymap, xkb_keycode_t key, void *data)
{
Wayland_KeymapBuilderState *sdlKeymap = (Wayland_KeymapBuilderState *)data;
SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
const xkb_keysym_t *syms;
const xkb_mod_mask_t xkb_valid_mod_mask = seat->keyboard.xkb.shift_mask |
seat->keyboard.xkb.alt_mask |
seat->keyboard.xkb.gui_mask |
seat->keyboard.xkb.level3_mask |
seat->keyboard.xkb.level5_mask |
seat->keyboard.xkb.caps_mask;
const SDL_Scancode scancode = SDL_GetScancodeFromTable(SDL_SCANCODE_TABLE_XFREE86_2, (key - 8));
if (scancode == SDL_SCANCODE_UNKNOWN) {
return;
}
if (WAYLAND_xkb_state_key_get_syms(sdlKeymap->state, key, &syms) > 0) {
SDL_Keycode keycode = SDL_GetKeyCodeFromKeySym(syms[0], key, sdlKeymap->modstate);
const xkb_level_index_t num_levels = WAYLAND_xkb_keymap_num_levels_for_key(seat->keyboard.xkb.keymap, key, seat->keyboard.xkb.current_layout);
for (xkb_level_index_t level = 0; level < num_levels; ++level) {
if (WAYLAND_xkb_keymap_key_get_syms_by_level(seat->keyboard.xkb.keymap, key, seat->keyboard.xkb.current_layout, level, &syms) > 0) {
xkb_mod_mask_t xkb_mod_masks[16];
const size_t num_masks = WAYLAND_xkb_keymap_key_get_mods_for_level(seat->keyboard.xkb.keymap, key, seat->keyboard.xkb.current_layout, level, xkb_mod_masks, SDL_arraysize(xkb_mod_masks));
for (size_t mask = 0; mask < num_masks; ++mask) {
// Ignore this modifier set if it uses unsupported modifier types.
if ((xkb_mod_masks[mask] | xkb_valid_mod_mask) != xkb_valid_mod_mask) {
continue;
}
if (!keycode) {
switch (scancode) {
case SDL_SCANCODE_RETURN:
keycode = SDLK_RETURN;
break;
case SDL_SCANCODE_ESCAPE:
keycode = SDLK_ESCAPE;
break;
case SDL_SCANCODE_BACKSPACE:
keycode = SDLK_BACKSPACE;
break;
case SDL_SCANCODE_DELETE:
keycode = SDLK_DELETE;
break;
default:
keycode = SDL_SCANCODE_TO_KEYCODE(scancode);
break;
const SDL_Keymod sdl_mod = (xkb_mod_masks[mask] & seat->keyboard.xkb.shift_mask ? SDL_KMOD_SHIFT : 0) |
(xkb_mod_masks[mask] & seat->keyboard.xkb.alt_mask ? SDL_KMOD_ALT : 0) |
(xkb_mod_masks[mask] & seat->keyboard.xkb.gui_mask ? SDL_KMOD_GUI : 0) |
(xkb_mod_masks[mask] & seat->keyboard.xkb.level3_mask ? SDL_KMOD_MODE : 0) |
(xkb_mod_masks[mask] & seat->keyboard.xkb.level5_mask ? SDL_KMOD_LEVEL5 : 0) |
(xkb_mod_masks[mask] & seat->keyboard.xkb.caps_mask ? SDL_KMOD_CAPS : 0);
SDL_Keycode keycode = SDL_GetKeyCodeFromKeySym(syms[0], key, sdl_mod);
if (!keycode) {
switch (scancode) {
case SDL_SCANCODE_RETURN:
keycode = SDLK_RETURN;
break;
case SDL_SCANCODE_ESCAPE:
keycode = SDLK_ESCAPE;
break;
case SDL_SCANCODE_BACKSPACE:
keycode = SDLK_BACKSPACE;
break;
case SDL_SCANCODE_DELETE:
keycode = SDLK_DELETE;
break;
default:
keycode = SDL_SCANCODE_TO_KEYCODE(scancode);
break;
}
}
SDL_SetKeymapEntry(seat->keyboard.sdl_keymap, scancode, sdl_mod, keycode);
}
}
SDL_SetKeymapEntry(sdlKeymap->keymap, scancode, sdlKeymap->modstate, keycode);
}
}
static void Wayland_UpdateKeymap(SDL_WaylandSeat *seat)
{
struct Keymod_masks
{
SDL_Keymod sdl_mask;
xkb_mod_mask_t xkb_mask;
} const keymod_masks[] = {
{ SDL_KMOD_NONE, 0 },
{ SDL_KMOD_SHIFT, seat->keyboard.xkb.shift_mask },
{ SDL_KMOD_CAPS, seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_SHIFT | SDL_KMOD_CAPS, seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_MODE, seat->keyboard.xkb.level3_mask },
{ SDL_KMOD_MODE | SDL_KMOD_SHIFT, seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask },
{ SDL_KMOD_MODE | SDL_KMOD_CAPS, seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_MODE | SDL_KMOD_SHIFT | SDL_KMOD_CAPS, seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_LEVEL5, seat->keyboard.xkb.level5_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_SHIFT, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.shift_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_CAPS, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_SHIFT | SDL_KMOD_CAPS, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_MODE, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.level3_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_MODE | SDL_KMOD_SHIFT, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_MODE | SDL_KMOD_CAPS, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.caps_mask },
{ SDL_KMOD_LEVEL5 | SDL_KMOD_MODE | SDL_KMOD_SHIFT | SDL_KMOD_CAPS, seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask },
};
if (!seat->keyboard.is_virtual) {
Wayland_KeymapBuilderState keymap;
keymap.keymap = SDL_CreateKeymap(false);
if (!keymap.keymap) {
return;
}
keymap.state = WAYLAND_xkb_state_new(seat->keyboard.xkb.keymap);
if (!keymap.state) {
SDL_SetError("failed to create XKB state");
SDL_DestroyKeymap(keymap.keymap);
return;
}
for (int i = 0; i < SDL_arraysize(keymod_masks); ++i) {
keymap.modstate = keymod_masks[i].sdl_mask;
WAYLAND_xkb_state_update_mask(keymap.state,
keymod_masks[i].xkb_mask & (seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.level5_mask), 0, keymod_masks[i].xkb_mask & seat->keyboard.xkb.caps_mask,
0, 0, seat->keyboard.xkb.current_layout);
WAYLAND_xkb_keymap_key_for_each(seat->keyboard.xkb.keymap,
Wayland_keymap_iter,
&keymap);
}
WAYLAND_xkb_state_unref(keymap.state);
SDL_SetKeymap(keymap.keymap, true);
SDL_DestroyKeymap(seat->keyboard.sdl_keymap);
seat->keyboard.sdl_keymap = keymap.keymap;
seat->keyboard.sdl_keymap = SDL_CreateKeymap(false);
if (!seat->keyboard.sdl_keymap) {
return;
}
WAYLAND_xkb_keymap_key_for_each(seat->keyboard.xkb.keymap, Wayland_keymap_iter, seat);
SDL_SetKeymap(seat->keyboard.sdl_keymap, true);
} else {
// Virtual keyboards use the default keymap.
SDL_SetKeymap(NULL, true);

9
src/video/wayland/SDL_waylandsym.h
View File

@@ -153,8 +153,15 @@ SDL_WAYLAND_SYM(void, xkb_keymap_key_for_each, (struct xkb_keymap *, xkb_keymap_
SDL_WAYLAND_SYM(int, xkb_keymap_key_get_syms_by_level, (struct xkb_keymap *,
xkb_keycode_t,
xkb_layout_index_t,
xkb_layout_index_t,
xkb_level_index_t,
const xkb_keysym_t **) )
SDL_WAYLAND_SYM(xkb_level_index_t, xkb_keymap_num_levels_for_key, (struct xkb_keymap *, xkb_keycode_t, xkb_layout_index_t) )
SDL_WAYLAND_SYM(size_t, xkb_keymap_key_get_mods_for_level, (struct xkb_keymap *,
xkb_keycode_t,
xkb_layout_index_t,
xkb_level_index_t,
xkb_mod_mask_t *,
size_t masks_size) )
SDL_WAYLAND_SYM(uint32_t, xkb_keysym_to_utf32, (xkb_keysym_t) )
SDL_WAYLAND_SYM(uint32_t, xkb_keymap_mod_get_index, (struct xkb_keymap *,
const char *) )