From 2286440b46637ab4e66c174fb56b2782fa24db0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tam=C3=A1s=20B=C3=A1lint=20Misius?= <lbphacker@gmail.com>
Date: Sat, 21 Dec 2024 23:55:50 +0100
Subject: [PATCH] Update refresh rate when the window is moved to another
 display

---
 src/PowderToySDL.cpp | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/PowderToySDL.cpp b/src/PowderToySDL.cpp
index c96885618..96612dc10 100644
--- a/src/PowderToySDL.cpp
+++ b/src/PowderToySDL.cpp
@@ -144,6 +144,21 @@ void blit(pixel *vid)
 	SDL_RenderPresent(sdl_renderer);
 }
 
+void UpdateRefreshRate()
+{
+	std::optional<int> refreshRate;
+	int displayIndex = SDL_GetWindowDisplayIndex(sdl_window);
+	if (displayIndex >= 0)
+	{
+		SDL_DisplayMode displayMode;
+		if (!SDL_GetCurrentDisplayMode(displayIndex, &displayMode) && displayMode.refresh_rate)
+		{
+			refreshRate = displayMode.refresh_rate;
+		}
+	}
+	ui::Engine::Ref().SetRefreshRate(refreshRate);
+}
+
 void SDLOpen()
 {
 	if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0)
@@ -156,7 +171,6 @@ void SDLOpen()
 	SDLSetScreen();
 
 	int displayIndex = SDL_GetWindowDisplayIndex(sdl_window);
-	std::optional<int> refreshRate;
 	if (displayIndex >= 0)
 	{
 		SDL_Rect rect;
@@ -165,13 +179,8 @@ void SDLOpen()
 			desktopWidth = rect.w;
 			desktopHeight = rect.h;
 		}
-		SDL_DisplayMode displayMode;
-		if (!SDL_GetCurrentDisplayMode(displayIndex, &displayMode) && displayMode.refresh_rate)
-		{
-			refreshRate = displayMode.refresh_rate;
-		}
 	}
-	ui::Engine::Ref().SetRefreshRate(refreshRate);
+	UpdateRefreshRate();
 
 	StopTextInput();
 }
@@ -431,6 +440,10 @@ static void EventProcess(const SDL_Event &event)
 				calculatedInitialMouse = true;
 			}
 			break;
+
+		case SDL_WINDOWEVENT_DISPLAY_CHANGED:
+			UpdateRefreshRate();
+			break;
 		}
 		break;
 	}