Measure absolute value of pointer motion distance

If pointer is moving to the negative axis direction, pointer movement
distance will always less than pre-defined mMotionSlop, thus
TAP_OUTSIDE_STACK will have chance to be sent, will cause unnecessary
focus stack switch.

Change-Id: Ia4c066bebce250257c7361ef976907a0ca2c6461
Signed-off-by: tingna_sung <tingna_sung@htc.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Not include fullscreen opaque window on screenshot

Extend the fullscreen meaning by adding opaque drawn check on
screenshot application; if there is a fullscreen window but not
opaque, we will continue finding behind windows; otherwise ending up
including behind windows. It's able to help avoiding capturing BLACK
screenshot bitmap.

Change-Id: I1c7e8f513c366688ea8001c3d0c799f3522f0ffd
Signed-off-by: tingna_sung <tingna_sung@htc.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Sync focus stack frame and layer with focus app.

Update focus stack frame/layer when focus app is changed to avoid
focus stack/layer isn't updated synchronously with focus app, it's
due to performLayoutAndPlaceSurfacesLocked() is not necessarily
called on focus app change; it will cause sending mismatching
TAP_OUTSIDE_STACK message if there is effectual incoming pointer
event, hence may also result in focus stack is changed again,
therefore erroneous focus app is set by ActivityManager at final.

Change-Id: Ia0ec9a543be887b51a3b29b3e62fdd471c15edf2
Signed-off-by: tingna_sung <tingna_sung@htc.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Fix Presentation window is removed on stack change

If an activity show a Presentation window and this activity is moved
to bottom or top, thus this Presentation window will be removed from
its display window list, and no chance to be added back into window
container; It will cause the incorrect state that Presentation window
is lost from secondary display window list(displayContent.mWindows),
but still exist in app token's window list(appWindowToken.allAppWindows);
Moreover, once this activity resume again, Presentation window is not
shown because it's lost.

In this way, don't remove non-target display app windows due to only
target(or called default) display windows are removed temporarily and
re-sorted then added back into window list later.

Change-Id: I8960ce191f6c662455cba5a0a5e6a1ff9ef03ae1
Signed-off-by: tingna_sung <tingna_sung@htc.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>