From b1bde5b6fe35f9ff94ae480d37c365410b94a43b Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Sat, 21 Sep 2024 01:26:52 +0200
Subject: Add shine effect

---
 src/effects/scheme.c |  2 ++
 src/effects/shine.c  | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 src/effects/shine.c

(limited to 'src/effects')

diff --git a/src/effects/scheme.c b/src/effects/scheme.c
index 0d70dec..9de96a1 100644
--- a/src/effects/scheme.c
+++ b/src/effects/scheme.c
@@ -1,8 +1,10 @@
 #include "scheme.h"
 
 extern const effect_scheme_t effect_pulse_scheme;
+extern const effect_scheme_t effect_shine_scheme;
 
 const effect_scheme_t *effect_schemes[] = {
     &effect_pulse_scheme,
+    &effect_shine_scheme,
     NULL
 };
diff --git a/src/effects/shine.c b/src/effects/shine.c
new file mode 100644
index 0000000..3a873fe
--- /dev/null
+++ b/src/effects/shine.c
@@ -0,0 +1,83 @@
+#include <string.h>
+#include <math.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "scheme.h"
+
+#include "../any_log.h"
+
+typedef struct {
+    effect_t effect;
+    unsigned int width;
+    cairo_pattern_t *gradient;
+} effect_shine_t;
+
+extern double cubic_bezier(double x, double a, double b, double c, double d);
+
+static void effect_shine_post(effect_t *effect, layout_t *layout, cairo_t *cr)
+{
+    struct timespec now;
+    timespec_get(&now, TIME_UTC);
+
+    struct timespec diff = timespec_diff(now, effect->start);
+    double t = (double)timespec_to_ms(diff) / timespec_to_ms(effect->info->duration);
+    double s = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0);
+
+    effect_shine_t *shine = (effect_shine_t *)effect;
+
+    unsigned int x = layout->x + s * layout->width - shine->width;
+    unsigned int y = layout->y;
+
+    cairo_set_operator(cr, CAIRO_OPERATOR_ATOP);
+    cairo_set_source(cr, shine->gradient);
+    cairo_rectangle(cr, x, y - layout->height / 2, shine->width, layout->height);
+    cairo_fill(cr);
+}
+
+static effect_t *effect_shine_allocate(const effect_info_t *info)
+{
+    effect_shine_t *effect = malloc(sizeof(effect_shine_t));
+    effect_init((effect_t *)effect, info);
+
+    effect->width = 20;
+    effect->gradient = cairo_pattern_create_linear(0, 0, effect->width, 0);
+    cairo_pattern_add_color_stop_rgba(effect->gradient, 1, 1, 1, 1, 0.1);
+    cairo_pattern_add_color_stop_rgba(effect->gradient, 0.5, 1, 1, 1, 0.8);
+    cairo_pattern_add_color_stop_rgba(effect->gradient, 1, 1, 1, 1, 0.1);
+
+    return (effect_t *)effect;
+}
+
+static void effect_shine_finalize(effect_shine_t *effect)
+{
+    cairo_pattern_destroy(effect->gradient);
+    free(effect);
+}
+
+static bool effect_shine_validate(effect_info_t *info, const effect_scheme_t *scheme)
+{
+    return true;
+}
+
+static const config_entry_t effect_shine_entries[] = {
+    { 0 },
+};
+
+const effect_scheme_t effect_shine_scheme = {
+    .name = "shine",
+    .info = {
+        .duration = {
+            .tv_sec = 0,
+            .tv_nsec = 200000000,
+        },
+        .allocate = effect_shine_allocate,
+        .finalize = (effect_finalize_t)effect_shine_finalize,
+        .post = effect_shine_post,
+    },
+    .size = sizeof(unsigned int),
+    .entries = effect_shine_entries,
+    .validate = effect_shine_validate,
+};
+
-- 
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