From 1331103ce7b2ebc828512cc8b5138a4b2ad9fc74 Mon Sep 17 00:00:00 2001
From: lkn <lkn@localhost>
Date: Wed, 24 Jun 2026 19:28:30 +0200
Subject: [PATCH] perf: skip frame repaint during resize grab, paint on release

wl_frame_paint is expensive (pixman blit per motion event).
Decorations content does not change during resize, only geometry.
Skip repaint while grab_type==2; repaint once on grab release.
---
 src/backend/wayland/wl_framebuf.c | 5 +++++
 src/backend/wayland/wl_grab.c     | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/src/backend/wayland/wl_framebuf.c b/src/backend/wayland/wl_framebuf.c
index 9127bbf..7d63940 100644
--- a/src/backend/wayland/wl_framebuf.c
+++ b/src/backend/wayland/wl_framebuf.c
@@ -575,6 +575,11 @@ void wl_frame_paint_button(WCoreWindow *button, WTexture *texture,
 int
 wl_frame_paint(struct WFrameWindow *fwin)
 {
+    /* During live resize, skip expensive repaint — decorations content
+     * doesn't change, only geometry. Paint once on grab release. */
+    if (wl_state.grab_type == 2)
+        return 0;
+
     struct wl_frame_buf *fb = frame_buf_find(fwin->core->window);
     if (!fb || !fb->image)
         return 0;
diff --git a/src/backend/wayland/wl_grab.c b/src/backend/wayland/wl_grab.c
index 51f4d43..2e17360 100644
--- a/src/backend/wayland/wl_grab.c
+++ b/src/backend/wayland/wl_grab.c
@@ -140,9 +140,14 @@ wl_grab_apply_motion(void)
 void
 wl_grab_end(void)
 {
+    int was_resize = (wl_state.grab_type == 2);
     wl_state.grab_type  = 0;
     wl_state.grab_view  = NULL;
     wl_set_cursor_image("left_ptr");
+    /* Repaint frame decorations deferred during resize */
+    if (was_resize && wl_state.scr && wl_state.scr->focused_window
+        && wl_state.scr->focused_window->frame)
+        wm_backend->frame_paint(wl_state.scr->focused_window->frame);
 }
 
 void