Add ring effectrewrite

1 files changed, 83 insertions, 0 deletions

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 <string.h>
+#include <assert.h>
+#include <math.h>
+
+#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,
+};