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Do not animate cursor trail while the cursor is hidden

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Programs that hide the cursor with DECTCEM but keep moving it causes
the trail to run a full animation after every cursor move, which is
unnecessary since the cursor is invisible.

When the cursor is hidden and the trail has fully faded out, snap the
trail corners to the cursor position instead of animating them. The
trail still tracks the hidden cursor, so switching focus to or away
from such a window still animates the trail.
This commit is contained in:
Pavel
2026-07-12 02:45:44 +02:00
parent 2607d22ac3
commit edcb87a0de
1 changed files with 8 additions and 4 deletions
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12
kitty/cursor_trail.c
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@@ -50,11 +50,15 @@ update_cursor_trail_target(CursorTrail *ct, Window *w, ndc_coords g) {
}
static bool
should_skip_cursor_trail_update(CursorTrail *ct, ndc_coords g, OSWindow *os_window) {
should_skip_cursor_trail_update(CursorTrail *ct, ndc_coords g, OSWindow *os_window, Window *w) {
if (os_window->live_resize.in_progress) {
return true;
}
if (!WD.screen->modes.mDECTCEM && ct->opacity <= 0.0f) {
return true;
}
if ((OPT(cursor_trail_start_threshold_x) > 0 || OPT(cursor_trail_start_threshold_y) > 0) && !ct->needs_render) {
int dx = (int)round((ct->corner_x[0] - EDGE(x, 1)) / g.dx);
int dy = (int)round((ct->corner_y[0] - EDGE(y, 0)) / g.dy);
@@ -66,7 +70,7 @@ should_skip_cursor_trail_update(CursorTrail *ct, ndc_coords g, OSWindow *os_wind
}
static void
update_cursor_trail_corners(CursorTrail *ct, ndc_coords g, monotonic_t now, OSWindow *os_window) {
update_cursor_trail_corners(CursorTrail *ct, ndc_coords g, monotonic_t now, OSWindow *os_window, Window *w) {
// the trail corners move towards the cursor corner at a speed proportional to their distance from the cursor corner.
// equivalent to exponential ease out animation.
static const int corner_index[2][4] = {{1, 1, 0, 0}, {0, 1, 1, 0}};
@@ -75,7 +79,7 @@ update_cursor_trail_corners(CursorTrail *ct, ndc_coords g, monotonic_t now, OSWi
float decay_fast = OPT(cursor_trail_decay_fast);
float decay_slow = OPT(cursor_trail_decay_slow);
if (should_skip_cursor_trail_update(ct, g, os_window)) {
if (should_skip_cursor_trail_update(ct, g, os_window, w)) {
for (int i = 0; i < 4; ++i) {
ct->corner_x[i] = EDGE(x, corner_index[0][i]);
ct->corner_y[i] = EDGE(y, corner_index[1][i]);
@@ -169,7 +173,7 @@ update_cursor_trail(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_wi
update_cursor_trail_target(ct, w, g);
}
update_cursor_trail_corners(ct, g, now, os_window);
update_cursor_trail_corners(ct, g, now, os_window, w);
update_cursor_trail_opacity(ct, w, now);
bool needs_render_prev = ct->needs_render;