From 7661f5a3d758c334926e47920fb2a190f8c10104 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Mon, 20 Aug 2018 21:36:23 -0700
Subject: [PATCH] Use SetThreadExecutionState() to disable the screensaver
 since SDL doesn't currently call that. Fixes #46

---
 app/streaming/session.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/app/streaming/session.cpp b/app/streaming/session.cpp
index b8a90769..cf69b5d3 100644
--- a/app/streaming/session.cpp
+++ b/app/streaming/session.cpp
@@ -5,6 +5,12 @@
 #include <SDL.h>
 #include "utils.h"
 
+// HACK: Need to call SetThreadExecutionState() because SDL doesn't
+#ifdef Q_OS_WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#endif
+
 #ifdef HAVE_FFMPEG
 #include "video/ffmpeg.h"
 #endif
@@ -732,6 +738,13 @@ void Session::exec()
     // Disable the screen saver
     SDL_DisableScreenSaver();
 
+#ifdef Q_OS_WIN32
+    // HACK: SDL doesn't call this, so we must do so to disable the
+    // screensaver when we're in windowed mode. DirectX will disable
+    // it for us when we're in full-screen exclusive mode.
+    SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
+#endif
+
     // Set timer resolution to 1 ms on Windows for greater
     // sleep precision and more accurate callback timing.
     SDL_SetHint(SDL_HINT_TIMER_RESOLUTION, "1");
@@ -869,6 +882,11 @@ void Session::exec()
                  SDL_GetError());
 
 DispatchDeferredCleanup:
+#ifdef Q_OS_WIN32
+    // HACK: See comment above
+    SetThreadExecutionState(ES_CONTINUOUS);
+#endif
+
     // Uncapture the mouse and hide the window immediately,
     // so we can return to the Qt GUI ASAP.
     SDL_SetRelativeMouseMode(SDL_FALSE);