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x11: Don't loop forever if the X server refuses a pointer grab.

This commit is contained in:
Ryan C. Gordon 2016-12-26 23:02:14 -05:00
parent 76f2ae3ca2
commit 7c31636666
2 changed files with 20 additions and 7 deletions
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2
src/video/x11/SDL_x11video.h
View File

@ -124,6 +124,8 @@ typedef struct SDL_VideoData
SDL_Scancode key_layout[256];
SDL_bool selection_waiting;
SDL_bool broken_pointer_grab; /* true if XGrabPointer seems unreliable. */
Uint32 last_mode_change_deadline;
SDL_bool global_mouse_changed;

25
src/video/x11/SDL_x11window.c
View File

@ -41,6 +41,7 @@
#include "SDL_timer.h"
#include "SDL_syswm.h"
#include "SDL_assert.h"
#include "SDL_log.h"
#define _NET_WM_STATE_REMOVE 0l
#define _NET_WM_STATE_ADD 1l
@ -1483,14 +1484,24 @@ X11_SetWindowGrab(_THIS, SDL_Window * window, SDL_bool grabbed)
if (oldstyle_fullscreen || grabbed) {
/* Try to grab the mouse */
for (;;) {
int result =
X11_XGrabPointer(display, data->xwindow, True, 0, GrabModeAsync,
GrabModeAsync, data->xwindow, None, CurrentTime);
if (result == GrabSuccess) {
break;
if (!data->videodata->broken_pointer_grab) {
int attempts;
int result;
/* Try for up to ~250ms to grab. If it still fails, stop trying. */
for (attempts = 0; attempts < 5; attempts++) {
result = X11_XGrabPointer(display, data->xwindow, True, 0, GrabModeAsync,
GrabModeAsync, data->xwindow, None, CurrentTime);
if (result == GrabSuccess) {
break;
}
SDL_Delay(50);
}
if (result != GrabSuccess) {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "The X server refused to let us grab the mouse. You might experience input bugs.");
data->videodata->broken_pointer_grab = SDL_TRUE; /* don't try again. */
}
SDL_Delay(50);
}
/* Raise the window if we grab the mouse */