From c54abdba2c3c584453c2c281df06e77de029736b Mon Sep 17 00:00:00 2001
From: Charlotte Meyer <dev@buffet.sh>
Date: Sat, 14 Aug 2021 21:31:31 +0000
Subject: [PATCH] Don't redraw on cursor movements unless required

---
 kiwmi/desktop/output.c | 23 ++++++++++++++++++++---
 kiwmi/input/cursor.c   |  4 ----
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/kiwmi/desktop/output.c b/kiwmi/desktop/output.c
index b40abd1..ea697af 100644
--- a/kiwmi/desktop/output.c
+++ b/kiwmi/desktop/output.c
@@ -137,6 +137,18 @@ send_frame_done_to_surface(
     wlr_surface_send_frame_done(surface, now);
 }
 
+static bool
+render_cursors(struct wlr_output *wlr_output)
+{
+    pixman_region32_t damage;
+    pixman_region32_init(&damage);
+    wlr_output_render_software_cursors(wlr_output, &damage);
+    bool damaged = pixman_region32_not_empty(&damage);
+    pixman_region32_fini(&damage);
+
+    return damaged;
+}
+
 static void
 output_frame_notify(struct wl_listener *listener, void *data)
 {
@@ -147,8 +159,6 @@ output_frame_notify(struct wl_listener *listener, void *data)
     struct timespec now;
     clock_gettime(CLOCK_MONOTONIC, &now);
 
-    printf("%d\n", output->damaged);
-
     if (output->damaged == 0) {
         send_frame_done_to_layer(
             &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND], &now);
@@ -169,6 +179,10 @@ output_frame_notify(struct wl_listener *listener, void *data)
             return;
         }
 
+        if (render_cursors(wlr_output)) {
+            output->damaged = 2;
+        }
+
         wlr_output_commit(wlr_output);
         return;
     }
@@ -221,7 +235,10 @@ output_frame_notify(struct wl_listener *listener, void *data)
     render_layer(&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP], &rdata);
     render_layer(&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY], &rdata);
 
-    wlr_output_render_software_cursors(wlr_output, NULL);
+    if (render_cursors(wlr_output)) {
+        output->damaged = 3;
+    }
+
     wlr_renderer_end(renderer);
 
     --output->damaged;
diff --git a/kiwmi/input/cursor.c b/kiwmi/input/cursor.c
index 5c23076..dd801b1 100644
--- a/kiwmi/input/cursor.c
+++ b/kiwmi/input/cursor.c
@@ -126,10 +126,6 @@ process_cursor_motion(struct kiwmi_server *server, uint32_t time)
     } else {
         wlr_seat_pointer_clear_focus(seat);
     }
-
-    wl_list_for_each (output, &server->desktop.outputs, link) {
-        output->damaged = 2;
-    }
 }
 
 static void