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sdl2: Work around SDL2 SDL_ShowWindow() bug

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Apparently it is possible for X to send an event to a hidden SDL2
window, leading to SDL2 believing it is now shown. SDL2 will pass the
SDL_WINDOWEVENT_SHOWN message to the application without actually
showing the window; the problem is that the next SDL_ShowWindow() will
be a no-op because SDL2 assumes the window is already shown.

The correct way to react to SDL_WINDOWEVENT_SHOWN would be to clear
scon->hidden (analogous for SDL_WINDOWEVENT_HIDDEN). However, due to the
window not actually being shown, this will somehow not be correct after
all.

Therefore, just hide the window on SDL_WINDOWEVENT_SHOWN if it is
supposed to be hidden (and analogous for SDL_WINDOWEVENT_HIDDEN).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Max Reitz 2014-12-12 10:52:52 +01:00 committed by Gerd Hoffmann
parent 1dfc5c8808
commit d3f3a0f453
1 changed files with 10 additions and 0 deletions
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10
ui/sdl2.c
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@ -548,6 +548,16 @@ static void handle_windowevent(SDL_Event *ev)
qemu_system_shutdown_request();
}
break;
case SDL_WINDOWEVENT_SHOWN:
if (scon->hidden) {
SDL_HideWindow(scon->real_window);
}
break;
case SDL_WINDOWEVENT_HIDDEN:
if (!scon->hidden) {
SDL_ShowWindow(scon->real_window);
}
break;
}
}