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separate update_cursor_trail function in smaller pieces

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Rick Choi
2024-10-19 16:53:06 +09:00
parent af8b563eb0
commit f64d2d27fb
1 changed files with 47 additions and 29 deletions
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76
kitty/cursor_trail.c
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@@ -1,4 +1,5 @@
#include "state.h"
#include "float.h"
inline static float
norm(float x, float y) {
@@ -7,51 +8,51 @@ norm(float x, float y) {
static void
update_cursor_trail_target(CursorTrail *ct, Window *w) {
// EDGE(x, 0) left
// EDGE(x, 1) right
// EDGE(y, 0) top
// EDGE(y, 1) bottom
#define EDGE(axis, index) ct->cursor_edge_##axis[index]
#define WD w->render_data
float left, right, top, bottom;
switch (WD.screen->cursor_render_info.shape) {
case CURSOR_BLOCK:
case CURSOR_HOLLOW:
EDGE(x, 0) = WD.xstart + WD.screen->cursor_render_info.x * WD.dx;
EDGE(y, 1) = WD.ystart - (WD.screen->cursor_render_info.y + 1) * WD.dy;
EDGE(x, 1) = EDGE(x, 0) + WD.dx;
EDGE(y, 0) = EDGE(y, 1) + WD.dy;
case CURSOR_BEAM:
case CURSOR_UNDERLINE:
left = WD.xstart + WD.screen->cursor_render_info.x * WD.dx;
bottom = WD.ystart - (WD.screen->cursor_render_info.y + 1) * WD.dy;
break;
default:
left = FLT_MAX;
bottom = FLT_MAX;
}
switch (WD.screen->cursor_render_info.shape) {
case CURSOR_BLOCK:
case CURSOR_HOLLOW:
right = left + WD.dx;
top = bottom + WD.dy;
break;
case CURSOR_BEAM:
EDGE(x, 0) = WD.xstart + WD.screen->cursor_render_info.x * WD.dx;
EDGE(y, 1) = WD.ystart - (WD.screen->cursor_render_info.y + 1) * WD.dy;
EDGE(x, 1) = EDGE(x, 0) + WD.dx / WD.screen->cell_size.width * OPT(cursor_beam_thickness);
EDGE(y, 0) = EDGE(y, 1) + WD.dy;
right = left + WD.dx / WD.screen->cell_size.width * OPT(cursor_beam_thickness);
top = bottom + WD.dy;
break;
case CURSOR_UNDERLINE:
EDGE(x, 0) = WD.xstart + WD.screen->cursor_render_info.x * WD.dx;
EDGE(y, 1) = WD.ystart - (WD.screen->cursor_render_info.y + 1) * WD.dy;
EDGE(x, 1) = EDGE(x, 0) + WD.dx;
EDGE(y, 0) = EDGE(y, 1) + WD.dy / WD.screen->cell_size.height * OPT(cursor_underline_thickness);
right = left + WD.dx;
top = bottom + WD.dy / WD.screen->cell_size.height * OPT(cursor_underline_thickness);
break;
default:
break;
}
if (left != FLT_MAX) {
EDGE(x, 0) = left;
EDGE(x, 1) = right;
EDGE(y, 0) = top;
EDGE(y, 1) = bottom;
}
}
bool
update_cursor_trail(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_window) {
static bool
update_cursor_trail_corners(CursorTrail *ct, monotonic_t now, OSWindow *os_window, float dx_threshold, float dy_threshold) {
// 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 ci[4][2] = {{1, 0}, {1, 1}, {0, 1}, {0, 0}};
const float dx_threshold = WD.dx / WD.screen->cell_size.width;
const float dy_threshold = WD.dy / WD.screen->cell_size.height;
bool needs_render_prev = ct->needs_render;
ct->needs_render = false;
if (!WD.screen->paused_rendering.expires_at && OPT(cursor_trail) < now - WD.screen->cursor->position_changed_by_client_at) {
update_cursor_trail_target(ct, w);
}
// the decay time for the trail to reach 1/1024 of its distance from the cursor corner
float decay_fast = OPT(cursor_trail_decay_fast);
@@ -91,15 +92,32 @@ update_cursor_trail(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_wi
ct->corner_y[i] += dy * step;
}
}
ct->updated_at = now;
for (int i = 0; i < 4; ++i) {
float dx = fabsf(EDGE(x, ci[i][0]) - ct->corner_x[i]);
float dy = fabsf(EDGE(y, ci[i][1]) - ct->corner_y[i]);
if (dx_threshold <= dx || dy_threshold <= dy) {
ct->needs_render = true;
break;
return true;
}
}
return false;
}
bool
update_cursor_trail(CursorTrail *ct, Window *w, monotonic_t now, OSWindow *os_window) {
const float dx_threshold = WD.dx / WD.screen->cell_size.width;
const float dy_threshold = WD.dy / WD.screen->cell_size.height;
bool needs_render_prev = ct->needs_render;
ct->needs_render = false;
if (!WD.screen->paused_rendering.expires_at && OPT(cursor_trail) < now - WD.screen->cursor->position_changed_by_client_at) {
update_cursor_trail_target(ct, w);
}
if (update_cursor_trail_corners(ct, now, os_window, dx_threshold, dy_threshold)) {
ct->needs_render = true;
}
if (ct->needs_render) {
ColorProfile *cp = WD.screen->color_profile;