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input: add a weston_pointer_clear_focus() helper function

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Valgrind has shown that in at least one place (default_grab_pointer_focus)
we're testing uninitialized values coming out of weston_compositor_pick_view.

This is happening when default_grab_pointer_focus is called when there is
nothing on the view list, and during the first repaint when only the black
surface with no input region exists.

This patch adds a function to clear pointer focus and also set the sx,sy
co-ordinates to a sentinel value we shouldn't compute with.

Assertions are added to make sure any time pointer focus is set to NULL
these values are used.

weston_compositor_pick_view() now returns these values too.

Now the values are always initialized, even when no view exists, and
they're initialized in such a way that actually doing computation
with them should fail in an obvious way, but we can compare them
safely for equality.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Derek Foreman 2015-05-11 15:40:11 -05:00 committed by Daniel Stone
parent 2ccd9a2d62
commit f9318d1452
6 changed files with 37 additions and 17 deletions
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4
desktop-shell/exposay.c
View File

@ -589,9 +589,7 @@ exposay_transition_active(struct desktop_shell *shell)
if (pointer) {
weston_pointer_start_grab(pointer,
&shell->exposay.grab_ptr);
weston_pointer_set_focus(pointer, NULL,
pointer->x,
pointer->y);
weston_pointer_clear_focus(pointer);
}
wl_list_for_each(shell_output, &shell->output_list, link) {
enum exposay_layout_state state;

4
desktop-shell/shell.c
View File

@ -3218,9 +3218,7 @@ popup_grab_focus(struct weston_pointer_grab *grab)
wl_resource_get_client(view->surface->resource) == client) {
weston_pointer_set_focus(pointer, view, sx, sy);
} else {
weston_pointer_set_focus(pointer, NULL,
wl_fixed_from_int(0),
wl_fixed_from_int(0));
weston_pointer_clear_focus(pointer);
}
}

7
src/compositor.c
View File

@ -1716,6 +1716,8 @@ weston_compositor_pick_view(struct weston_compositor *compositor,
return view;
}
*vx = wl_fixed_from_int(-1000000);
*vy = wl_fixed_from_int(-1000000);
return NULL;
}
@ -1760,10 +1762,7 @@ weston_view_unmap(struct weston_view *view)
if (keyboard && keyboard->focus == view->surface)
weston_keyboard_set_focus(keyboard, NULL);
if (pointer && pointer->focus == view)
weston_pointer_set_focus(pointer,
NULL,
wl_fixed_from_int(0),
wl_fixed_from_int(0));
weston_pointer_clear_focus(pointer);
if (touch && touch->focus == view)
weston_touch_set_focus(touch, NULL);
}

2
src/compositor.h
View File

@ -374,6 +374,8 @@ weston_pointer_set_focus(struct weston_pointer *pointer,
struct weston_view *view,
wl_fixed_t sx, wl_fixed_t sy);
void
weston_pointer_clear_focus(struct weston_pointer *pointer);
void
weston_pointer_start_grab(struct weston_pointer *pointer,
struct weston_pointer_grab *grab);
void

3
src/data-device.c
View File

@ -591,8 +591,7 @@ weston_pointer_start_drag(struct weston_pointer *pointer,
&drag->base.data_source_listener);
}
weston_pointer_set_focus(pointer, NULL,
wl_fixed_from_int(0), wl_fixed_from_int(0));
weston_pointer_clear_focus(pointer);
weston_pointer_start_grab(pointer, &drag->grab);
return 0;

34
src/input.c
View File

@ -82,7 +82,7 @@ pointer_focus_view_destroyed(struct wl_listener *listener, void *data)
container_of(listener, struct weston_pointer,
focus_view_listener);
weston_pointer_set_focus(pointer, NULL, 0, 0);
weston_pointer_clear_focus(pointer);
}
static void
@ -92,7 +92,7 @@ pointer_focus_resource_destroyed(struct wl_listener *listener, void *data)
container_of(listener, struct weston_pointer,
focus_resource_listener);
weston_pointer_set_focus(pointer, NULL, 0, 0);
weston_pointer_clear_focus(pointer);
}
static void
@ -498,6 +498,9 @@ weston_pointer_create(struct weston_seat *seat)
wl_signal_add(&seat->compositor->output_destroyed_signal,
&pointer->output_destroy_listener);
pointer->sx = wl_fixed_from_int(-1000000);
pointer->sy = wl_fixed_from_int(-1000000);
return pointer;
}
@ -628,6 +631,26 @@ seat_send_updated_caps(struct weston_seat *seat)
wl_signal_emit(&seat->updated_caps_signal, seat);
}
/** Clear the pointer focus
*
* \param pointer the pointer to clear focus for.
*
* This can be used to unset pointer focus and set the co-ordinates to the
* arbitrary values we use for the no focus case.
*
* There's no requirement to use this function. For example, passing the
* results of a weston_compositor_pick_view() directly to
* weston_pointer_set_focus() will do the right thing when no view is found.
*/
WL_EXPORT void
weston_pointer_clear_focus(struct weston_pointer *pointer)
{
weston_pointer_set_focus(pointer, NULL,
wl_fixed_from_int(-1000000),
wl_fixed_from_int(-1000000));
}
WL_EXPORT void
weston_pointer_set_focus(struct weston_pointer *pointer,
struct weston_view *view,
@ -699,6 +722,9 @@ weston_pointer_set_focus(struct weston_pointer *pointer,
pointer->sx = sx;
pointer->sy = sy;
assert(view || sx == wl_fixed_from_int(-1000000));
assert(view || sy == wl_fixed_from_int(-1000000));
wl_signal_emit(&pointer->focus_signal, pointer);
}
@ -2271,9 +2297,7 @@ weston_seat_release_pointer(struct weston_seat *seat)
seat->pointer_device_count--;
if (seat->pointer_device_count == 0) {
weston_pointer_set_focus(pointer, NULL,
wl_fixed_from_int(0),
wl_fixed_from_int(0));
weston_pointer_clear_focus(pointer);
weston_pointer_cancel_grab(pointer);
if (pointer->sprite)