From cab32e7e67c2a78d10e0961f746ee7408978fb43 Mon Sep 17 00:00:00 2001
From: PatTheMav <patthemav+github@gmail.com>
Date: Thu, 1 Oct 2020 18:45:13 +0200
Subject: [PATCH] UI: Disable QT's implicit colourspace conversion on macOS

Fixes issues as described in https://bugreports.qt.io/browse/QTBUG-47660
and halves CPU usage of OBS' UI by about 40-50%.
---
 UI/platform-osx.mm       | 7 +++++++
 UI/platform.hpp          | 1 +
 UI/window-basic-main.cpp | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/UI/platform-osx.mm b/UI/platform-osx.mm
index 18de5e7e9..228e38fe0 100644
--- a/UI/platform-osx.mm
+++ b/UI/platform-osx.mm
@@ -144,6 +144,13 @@ bool IsAlwaysOnTop(QWidget *window)
 	return (window->windowFlags() & Qt::WindowStaysOnTopHint) != 0;
 }
 
+void disableColorSpaceConversion(QWidget *window)
+{
+	NSView *view =
+		(__bridge NSView *)reinterpret_cast<void *>(window->winId());
+	view.window.colorSpace = NSColorSpace.sRGBColorSpace;
+}
+
 void SetAlwaysOnTop(QWidget *window, bool enable)
 {
 	Qt::WindowFlags flags = window->windowFlags();
diff --git a/UI/platform.hpp b/UI/platform.hpp
index 6100e6fc2..df218183f 100644
--- a/UI/platform.hpp
+++ b/UI/platform.hpp
@@ -67,4 +67,5 @@ QString GetMonitorName(const QString &id);
 void EnableOSXVSync(bool enable);
 void EnableOSXDockIcon(bool enable);
 void InstallNSApplicationSubclass();
+void disableColorSpaceConversion(QWidget *window);
 #endif
diff --git a/UI/window-basic-main.cpp b/UI/window-basic-main.cpp
index a93b21363..183422349 100644
--- a/UI/window-basic-main.cpp
+++ b/UI/window-basic-main.cpp
@@ -1867,6 +1867,10 @@ void OBSBasic::OBSInit()
 	SystemTray(true);
 #endif
 
+#ifdef __APPLE__
+	disableColorSpaceConversion(this);
+#endif
+
 	bool has_last_version = config_has_user_value(App()->GlobalConfig(),
 						      "General", "LastVersion");
 	bool first_run =