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This CL adds a windowBackground drawable equivalent to the covers shown by lockscreen
and app, to remove the black screen in between. With this CL I mostly see no artifacts
when opening camera from lockscreen. Some issues:
* to improve memory usage in system UI holding the lockscreen preview, a vector
camera blanket was added in ag/587418 to ic_camera_blanket. That works transparently
everywhere so far but not in resource drawables that can only handle bitmaps in
layer-list items. Split the vector and bitmaps here, which means only the lockscreen
uses the vector -- this also surfaced a color mismatch between the vector and our PNG
bitmaps, corrected in the new ic_camera_blanket_vector resource. This is a bit fragile
as we rely on pixel match of the two resources, would like a cleaner solution but the
layer-list limitation is tough -- without this change the app crashes at runtime within
BitmapDrawable when the windowBackground is loaded.
* likewise both the lockscreen and app covers explicitly size the bitmap, there are no
provisions to do so within layer-list. Will follow up with a refactor of in-app cover
(ModeTransitionView) to remove explicit sizing and then all will rely on bitmap size
(per above will still need vector file size coordinated with bitmap).
* current implementation relies upon a black window background, we restore that in onCreate.
* Both secure camera and v21 main camera currently use the windowBackground, will submit
just for secure then introduce for main camera when we always start into Camera mode.
* For L explicitly set android:windowDrawsSystemBarBackgrounds to false to ensure the
system preview into the DecorView doesn't take the navigation bar into account when
vertically centering the cover bitmap, to make the preview identical to the other covers.
Bug: 18369862
Change-Id: Ia481e2d1d94bdc5a5d39b4d35b32c29a75bf99ec
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