From 8251b906b6dfda264662e604ad93d0a51bb43c56 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 6 Apr 2019 10:05:21 +0530
Subject: [PATCH] Add a listener for GPU changed events on macOS

Currently does nothing, but could potentially be used to fix:
https://github.com/kovidgoyal/kitty/issues/794

Will need someone with the hardware though to test
exactly what needs to be done to restore the custom cursor image.
---
 glfw/cocoa_window.m | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/glfw/cocoa_window.m b/glfw/cocoa_window.m
index fddcee4d4..772f9decc 100644
--- a/glfw/cocoa_window.m
+++ b/glfw/cocoa_window.m
@@ -286,6 +286,18 @@ static int translateKey(unsigned int key, GLFWbool apply_keymap)
     return _glfw.ns.keycodes[key];
 }
 
+static void
+display_reconfigured(CGDirectDisplayID display, CGDisplayChangeSummaryFlags flags, void *userInfo)
+{
+    (void)(userInfo); (void)(display); (void)(flags);
+    if (flags & kCGDisplayBeginConfigurationFlag) {
+        return;
+    }
+    if (flags & kCGDisplaySetModeFlag) {
+        // GPU possibly changed
+    }
+}
+
 // Translate a GLFW keycode to a Cocoa modifier flag
 //
 static NSUInteger translateKeyToModifierFlag(int key)
@@ -488,9 +500,15 @@ - (void)applicationDidFinishLaunching:(NSNotification *)notification
 {
     [NSApp stop:nil];
 
+    CGDisplayRegisterReconfigurationCallback(display_reconfigured, NULL);
     _glfwPlatformPostEmptyEvent();
 }
 
+- (void)applicationWillTerminate:(NSNotification *)aNotification
+{
+    CGDisplayRemoveReconfigurationCallback(display_reconfigured, NULL);
+}
+
 - (void)applicationDidHide:(NSNotification *)notification
 {
     int i;