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sdl: Limit sdl_grab_end in handle_activation to Windows hosts 

There are scenarios on Linux with some SDL versions where
handle_activation is continuous invoked with state = SDL_APPINPUTFOCUS
and gain = 0 while we grabbed the input. This causes a ping-pong when we
grab the input after an absolute mouse entered the window.

As this sdl_grab_end was once introduced to work around a Windows-only
issue (0294ffb9c8), limit it to that platform.

CC: Erik Rull <erik.rull@rdsoftware.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2012-01-31 13:45:31 +01:00 committed by Anthony Liguori
parent 822f98d2a5
commit 02df4d6fb4
1 changed files with 4 additions and 0 deletions
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4
ui/sdl.c
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@ -828,10 +828,14 @@ static void handle_mousebutton(DisplayState *ds, SDL_Event *ev)
static void handle_activation(DisplayState *ds, SDL_Event *ev) static void handle_activation(DisplayState *ds, SDL_Event *ev)
{ {
#ifdef _WIN32
/* Disable grab if the window no longer has the focus
* (Windows-only workaround) */
if (gui_grab && ev->active.state == SDL_APPINPUTFOCUS && if (gui_grab && ev->active.state == SDL_APPINPUTFOCUS &&
!ev->active.gain && !gui_fullscreen) { !ev->active.gain && !gui_fullscreen) {
sdl_grab_end(); sdl_grab_end();
} }
#endif
if (!gui_grab && ev->active.gain && is_graphic_console() && if (!gui_grab && ev->active.gain && is_graphic_console() &&
(kbd_mouse_is_absolute() || absolute_enabled)) { (kbd_mouse_is_absolute() || absolute_enabled)) {
absolute_mouse_grab(); absolute_mouse_grab();