From 0a9d15a9780f48e2142678ce1264cc73ff8f1b75 Mon Sep 17 00:00:00 2001
From: Sintendo <bram.speeckaert@gmail.com>
Date: Sun, 8 Nov 2020 10:34:17 +0100
Subject: [PATCH] hiro/cocoa: Implement Application::setScreenSaver

Based on code from Dolphin and SDL2.

https://github.com/dolphin-emu/dolphin/blob/908d6f8fa0bb68a48ed3ce966567ebf76abcf919/Source/Core/UICommon/UICommon.cpp#L416
https://github.com/SDL-mirror/SDL/blob/cf1c19293687f10579c32ad2106eaead3d850f93/src/video/cocoa/SDL_cocoaevents.m#L514
---
 hiro/cocoa/application.cpp | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/hiro/cocoa/application.cpp b/hiro/cocoa/application.cpp
index 2afaeb9e..4303f7c0 100755
--- a/hiro/cocoa/application.cpp
+++ b/hiro/cocoa/application.cpp
@@ -1,4 +1,5 @@
 #if defined(Hiro_Application)
+#include <IOKit/pwr_mgt/IOPMLib.h>
 
 @implementation CocoaDelegate : NSObject
 
@@ -92,7 +93,24 @@ auto pApplication::quit() -> void {
 }
 
 auto pApplication::setScreenSaver(bool screenSaver) -> void {
-  //TODO: not implemented
+  static IOPMAssertionID powerAssertion = kIOPMNullAssertionID;
+
+  // do nothing if current already matches desired state
+  bool current = powerAssertion == kIOPMNullAssertionID;
+  if(current == screenSaver) return;
+
+  @autoreleasepool {
+    if(screenSaver) {
+      IOPMAssertionRelease(powerAssertion);
+      powerAssertion = kIOPMNullAssertionID;
+    } else {
+      string reason = {Application::state().name, " screensaver suppression"};
+      NSString* assertionName = [NSString stringWithUTF8String:reason.data()];
+      bool success = IOPMAssertionCreateWithName(kIOPMAssertionTypePreventUserIdleDisplaySleep,
+        kIOPMAssertionLevelOn, (CFStringRef) assertionName, &powerAssertion) != kIOReturnSuccess;
+      if(success) powerAssertion = kIOPMNullAssertionID;
+    }
+  }
 }
 
 auto pApplication::initialize() -> void {