From 9ed89c17dee752154c36d71cae93d20cccfc71ef Mon Sep 17 00:00:00 2001
From: Berke Güzel <wenekar1@gmail.com>
Date: Mon, 12 Oct 2026 14:27:51 +0300
Subject: perf: optimize hot-path loops, data structures, and cache locality

---
 src/wayland/buffer.c | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

(limited to 'src/wayland/buffer.c')

diff --git a/src/wayland/buffer.c b/src/wayland/buffer.c
index a1486fa..0561da3 100644
--- a/src/wayland/buffer.c
+++ b/src/wayland/buffer.c
@@ -322,19 +322,16 @@ int buffer_pick_free_index(const struct buffer *bufs, int cur)
     return free_buf_lut[(unsigned)cur & 3][busy];
 }
 
-struct latency_feedback {
-    struct wayland_surface *window;
-    struct wp_presentation_feedback *proxy;
-    struct latency_feedback *next;
-};
-
 static void feedback_destroy(struct latency_feedback *feedback)
 {
     struct latency_feedback **link = &feedback->window->latency_feedbacks;
     while (*link && *link != feedback) link = &(*link)->next;
     if (*link) *link = feedback->next;
     wp_presentation_feedback_destroy(feedback->proxy);
-    free(feedback);
+    if (feedback->in_pool)
+        *feedback = (struct latency_feedback){0};
+    else
+        free(feedback);
 }
 
 void surface_feedback_destroy(struct wayland_surface *w)
@@ -386,10 +383,22 @@ void surface_request_presentation_feedback(struct wayland_surface *w)
         return;
     struct wp_presentation_feedback *fb =
         wp_presentation_feedback(w->conn->presentation, w->surface);
-    struct latency_feedback *feedback = fb ? calloc(1, sizeof(*feedback)) : NULL;
-    if (!feedback) {
-        if (fb) wp_presentation_feedback_destroy(fb);
+    if (!fb)
         return;
+    struct latency_feedback *feedback = NULL;
+    for (int i = 0; i < 8; i++) {
+        if (!w->latency_pool[i].window) {
+            feedback = &w->latency_pool[i];
+            feedback->in_pool = true;
+            break;
+        }
+    }
+    if (!feedback) {
+        feedback = calloc(1, sizeof(*feedback));
+        if (!feedback) {
+            wp_presentation_feedback_destroy(fb);
+            return;
+        }
     }
     feedback->window = w;
     feedback->proxy = fb;
@@ -449,7 +458,10 @@ bool wayland_surface_present(struct wayland_surface *w, const struct yasl_frameb
         fb->size.x != w->width || fb->size.y != w->height)
         return false;
 
-    w->damage = *damage;
+    w->damage.n = damage->n;
+    w->damage.bounds = damage->bounds;
+    if (damage->n > 0)
+        memcpy(w->damage.rects, damage->rects, (size_t)damage->n * sizeof(damage->rects[0]));
     arm_frame(w);
     if (w->closed)
         return false;
-- 
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