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Use new parametrized curve rendering for rounded separators

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Kovid Goyal
2025-05-10 09:23:12 +05:30
parent 8ba9bfd460
commit 0f3603c0eb
1 changed files with 21 additions and 10 deletions
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31
kitty/decorations.c
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@@ -593,16 +593,26 @@ typedef struct CubicBezier {
#define bezier_eq(which) { \
const CubicBezier *cb = v; \
double tm1 = 1 - t; \
double tm1_3 = tm1 * tm1 * tm1; \
double t_3 = t * t * t; \
return tm1_3 * cb->start.which + 3 * t * tm1 * (tm1 * cb->c1.which + t * cb->c2.which) + t_3 * cb->end.which; \
const double u = 1. - t; \
const double u_3 = u * u * u; \
const double t_3 = t * t * t; \
return u_3 * cb->start.which + 3 * t * u * (u * cb->c1.which + t * cb->c2.which) + t_3 * cb->end.which; \
}
static double
bezier_x(const void *v, double t) { bezier_eq(x); }
static double
bezier_y(const void *v, double t) { bezier_eq(y); }
#define bezier_prime_eq(which) { \
const CubicBezier *cb = v; \
const double u = 1. - t; \
const double u_2 = u * u; \
const double t_2 = t * t; \
return 3 * u_2 * (cb->c1.which - cb->start.which) + 6 * t * u * (cb->c2.which - cb->c1.which) + 3 * t_2 * (cb->end.which - cb->c2.which); \
}
static double bezier_x(const void *v, double t) { bezier_eq(x); }
static double bezier_y(const void *v, double t) { bezier_eq(y); }
static double bezier_prime_x(const void *v, double t) { bezier_prime_eq(x); }
static double bezier_prime_y(const void *v, double t) { bezier_prime_eq(y); }
#undef bezier_eq
#undef bezier_prime_eq
static int
find_bezier_for_D(int width, int height) {
@@ -754,8 +764,9 @@ rounded_separator(Canvas *self, uint level, bool left) {
uint gap = thickness(self, level, true);
int c1x = find_bezier_for_D(minus(self->width, gap), self->height);
CubicBezier cb = {.end={.y=self->height - 1}, .c1={.x=c1x}, .c2={.x=c1x, .y=self->height - 1}};
if (left) { draw_parametrized_curve(self, level, bezier_x(&cb, t), bezier_y(&cb, t)); }
else { mirror_horizontally(draw_parametrized_curve(self, level, bezier_x(&cb, t), bezier_y(&cb, t))); }
#define d draw_parametrized_curve_with_derivative(self, &cb, level, bezier_x, bezier_y, bezier_prime_x, bezier_prime_y, 0, 0, 0)
if (left) { d; } else { mirror_horizontally(d); }
#undef d
}
static void