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add distance threshold to cursor trail

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This commit is contained in:
Rick Choi 2024-10-24 18:16:36 +09:00
parent cfed32281d
commit 39deb82795
1 changed files with 21 additions and 8 deletions
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29
kitty/cursor_trail.c
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@ -46,6 +46,23 @@ update_cursor_trail_target(CursorTrail *ct, Window *w) {
}
}
static bool
should_skip_cursor_trail_update(CursorTrail *ct, Window *w, OSWindow *os_window) {
if (os_window->live_resize.in_progress) {
return true;
}
int distance_threshold = 2; // make it option
if (distance_threshold > 0 && !ct->needs_render) {
int dx = (int)round((ct->corner_x[0] - EDGE(x, 1)) / WD.dx);
int dy = (int)round((ct->corner_y[0] - EDGE(y, 0)) / WD.dy);
if (abs(dx) + abs(dy) <= distance_threshold) {
return true;
}
}
return false;
}
static bool
update_cursor_trail_corners(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_window) {
// the trail corners move towards the cursor corner at a speed proportional to their distance from the cursor corner.
@ -58,7 +75,7 @@ update_cursor_trail_corners(CursorTrail *ct, Window *w, monotonic_t now, OSWindo
float decay_fast = OPT(cursor_trail_decay_fast);
float decay_slow = OPT(cursor_trail_decay_slow);
if (os_window->live_resize.in_progress) {
if (should_skip_cursor_trail_update(ct, w, os_window)) {
for (int i = 0; i < 4; ++i) {
ct->corner_x[i] = EDGE(x, ci[i][0]);
ct->corner_y[i] = EDGE(y, ci[i][1]);
@ -70,11 +87,11 @@ update_cursor_trail_corners(CursorTrail *ct, Window *w, monotonic_t now, OSWindo
float cursor_diag_2 = norm(EDGE(x, 1) - EDGE(x, 0), EDGE(y, 1) - EDGE(y, 0)) * 0.5f;
float dt = (float)monotonic_t_to_s_double(now - ct->updated_at);
float dx[4], dy[4];
float dot[4]; // dot product of "direction vector" and "cursor center to corner vector"
// dot product here is used to dynamically adjust the decay speed of
// each corner. The closer the corner is to the cursor, the faster it
// moves.
float dx[4], dy[4];
float dot[4]; // dot product of "direction vector" and "cursor center to corner vector"
for (int i = 0; i < 4; ++i) {
dx[i] = EDGE(x, ci[i][0]) - ct->corner_x[i];
dy[i] = EDGE(y, ci[i][1]) - ct->corner_y[i];
@ -127,11 +144,7 @@ update_cursor_trail(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_wi
}
bool needs_render_prev = ct->needs_render;
ct->needs_render = false;
if (update_cursor_trail_corners(ct, w, now, os_window)) {
ct->needs_render = true;
}
ct->needs_render = update_cursor_trail_corners(ct, w, now, os_window);
// returning true here will cause the cells to be drawn
return ct->needs_render || needs_render_prev;