From b492e69682945fdf0ada95a66edd1e2cb637eabd Mon Sep 17 00:00:00 2001 From: Federico Angelilli Date: Mon, 11 Nov 2024 23:04:59 +0100 Subject: Add ring effect --- src/effects/ring.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 src/effects/ring.c (limited to 'src/effects/ring.c') diff --git a/src/effects/ring.c b/src/effects/ring.c new file mode 100644 index 0000000..5de5489 --- /dev/null +++ b/src/effects/ring.c @@ -0,0 +1,83 @@ +#include +#include +#include + +#include "scheme.h" + +#include "../any_log.h" + +typedef struct { + effect_t effect; + unsigned int width; + unsigned int padding; + color_t color; +} effect_ring_t; + +extern double cubic_bezier(double x, double a, double b, double c, double d); + +static void effect_ring_post(effect_t *effect, layout_t *layout, cairo_t *cr) +{ + struct timespec now; + timespec_get(&now, TIME_UTC); + + // After half the duration we invert direction + struct timespec midpoint = timespec_div(effect->info->duration, 2); + struct timespec diff = timespec_diff(now, effect->start); + + double t = timespec_greater(midpoint, diff) + ? (double)timespec_to_ms(diff) / timespec_to_ms(midpoint) + : 1.0 - (double)timespec_to_ms(timespec_diff(diff, midpoint)) / timespec_to_ms(midpoint); + + double s = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0); + double angle = 2 * M_PI * s; + (void)angle; + + effect_ring_t *ring = (effect_ring_t *)effect; + double radius = layout->width / 2 - ring->padding - ring->width / 2; + + cairo_set_line_width(cr, ring->width); + cairo_set_source_rgba(cr, ring->color.r, ring->color.g, ring->color.b, ring->color.a); + + cairo_arc(cr, layout->x + layout->width / 2, layout->y + layout->height / 2, radius, M_PI/2, 0); + cairo_stroke(cr); +} + +static effect_t *effect_ring_allocate(const effect_info_t *info) +{ + effect_ring_t *effect = malloc(sizeof(effect_ring_t)); + effect_init((effect_t *)effect, info); + + effect->width = *(unsigned int *)info->state; + effect->padding = *(unsigned int *)(info->state + sizeof(unsigned int)); + effect->color = *(color_t*)(info->state + 2 * sizeof(unsigned int)); + + return (effect_t *)effect; +} + +static void effect_ring_finalize(effect_t *effect) +{ + free(effect); +} + +static const config_entry_t effect_ring_entries[] = { + { "width", CONFIG_UINT, NULL, 0 }, + { "padding", CONFIG_UINT, NULL, sizeof(unsigned int) }, + { "color", CONFIG_COLOR, NULL, sizeof(unsigned int) * 2}, + { 0 }, +}; + +const effect_scheme_t effect_ring_scheme = { + .name = "ring", + .info = { + .duration = { + .tv_sec = 0, + .tv_nsec = 200000000, + }, + .allocate = effect_ring_allocate, + .finalize = effect_ring_finalize, + .post = effect_ring_post, + }, + .size = sizeof(unsigned int) * 2 + sizeof(color_t), + .entries = effect_ring_entries, + .validate = NULL, +}; -- cgit v1.2.3