From 1c1fe5ec53173fcccb6767a3c45b816610a8c72a Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Sat, 16 Feb 2019 15:21:14 +0100
Subject: [PATCH] Use "always on top" only for SDL >= 2.0.5

The flag SDL_WINDOW_ALWAYS_ON_TOP is available since SDL 2.0.5.

Do not use it if SDL is older, to fix compilation failure.

Fixes <https://github.com/Genymobile/scrcpy/issues/432>
---
 app/src/compat.h | 2 ++
 app/src/screen.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/app/src/compat.h b/app/src/compat.h
index 4f709af6..fd68d61a 100644
--- a/app/src/compat.h
+++ b/app/src/compat.h
@@ -39,6 +39,8 @@
 # define SCRCPY_SDL_HAS_HINT_MOUSE_FOCUS_CLICKTHROUGH
 // <https://wiki.libsdl.org/SDL_GetDisplayUsableBounds>
 # define SCRCPY_SDL_HAS_GET_DISPLAY_USABLE_BOUNDS
+// <https://wiki.libsdl.org/SDL_WindowFlags>
+# define SCRCPY_SDL_HAS_WINDOW_ALWAYS_ON_TOP
 #endif
 
 #endif
diff --git a/app/src/screen.c b/app/src/screen.c
index 4e9752c2..1632e27f 100644
--- a/app/src/screen.c
+++ b/app/src/screen.c
@@ -157,7 +157,12 @@ SDL_bool screen_init_rendering(struct screen *screen,
     window_flags |= SDL_WINDOW_ALLOW_HIGHDPI;
 #endif
     if (always_on_top) {
+#ifdef SCRCPY_SDL_HAS_WINDOW_ALWAYS_ON_TOP
         window_flags |= SDL_WINDOW_ALWAYS_ON_TOP;
+#else
+        LOGW("The 'always on top' flag is not available "
+             "(compile with SDL >= 2.0.5 to enable it)");
+#endif
     }
 
     screen->window = SDL_CreateWindow(device_name, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,