From 849dcd424db630dcac345874d2bc3665f04276c1 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 5 May 2024 13:42:51 +0530
Subject: [PATCH] Wayland: save energy by not rendering "suspended" windows on
 compositors that support that

Note that this breaks kitty on GNOME 45 which has a bug, but it fine on
GNOME 46.
---
 docs/changelog.rst |  2 ++
 glfw/wl_window.c   | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 4e5befd0e..60b75d07c 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -68,6 +68,8 @@ Detailed list of changes
 
 - Dont clear selections on erase in screen commands unless the erased region intersects a selection (:iss:`7408`)
 
+- Wayland: save energy by not rendering "suspended" windows on compositors that support that
+
 0.34.1 [2024-04-19]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/glfw/wl_window.c b/glfw/wl_window.c
index dfe869e65..d3786c721 100644
--- a/glfw/wl_window.c
+++ b/glfw/wl_window.c
@@ -761,6 +761,7 @@ static const struct xdg_toplevel_listener xdgToplevelListener = {
 
 static void
 apply_xdg_configure_changes(_GLFWwindow *window) {
+    bool suspended_changed = false;
     if (window->wl.pending_state & PENDING_STATE_TOPLEVEL) {
         uint32_t new_states = window->wl.pending.toplevel_states;
         int width = window->wl.pending.width;
@@ -771,6 +772,10 @@ apply_xdg_configure_changes(_GLFWwindow *window) {
             window->wl.once.surface_configured = true;
         }
 
+#ifdef XDG_TOPLEVEL_STATE_SUSPENDED_SINCE_VERSION
+        suspended_changed = ((new_states & TOPLEVEL_STATE_SUSPENDED) != (window->wl.current.toplevel_states & TOPLEVEL_STATE_SUSPENDED));
+#endif
+
         if (new_states != window->wl.current.toplevel_states ||
                 width != window->wl.current.width ||
                 height != window->wl.current.height) {
@@ -802,6 +807,12 @@ apply_xdg_configure_changes(_GLFWwindow *window) {
     inform_compositor_of_window_geometry(window, "configure");
     commit_window_surface_if_safe(window);
     window->wl.pending_state = 0;
+#ifdef XDG_TOPLEVEL_STATE_SUSPENDED_SINCE_VERSION
+    if (suspended_changed) {
+        debug("Window occlusion state changed, occluded: %d\n", (window->wl.current.toplevel_states & TOPLEVEL_STATE_SUSPENDED) != 0);
+        _glfwInputWindowOcclusion(window, window->wl.current.toplevel_states & TOPLEVEL_STATE_SUSPENDED);
+    }
+#endif
 }
 
 typedef union pixel {
@@ -1666,6 +1677,9 @@ int _glfwPlatformWindowFocused(_GLFWwindow* window)
 
 int _glfwPlatformWindowOccluded(_GLFWwindow* window UNUSED)
 {
+#ifdef XDG_TOPLEVEL_STATE_SUSPENDED_SINCE_VERSION
+    return (window->wl.current.toplevel_states & TOPLEVEL_STATE_SUSPENDED) != 0;
+#endif
     return false;
 }