tree 28ebf44ea836cfdcbe41ead53943104a1d026b8d
parent e0a676a3bb0e7b9aced9359a021e4c5d2ffef752
author Jeff Brown <jeffbrown@google.com> 1354658668 -0800
committer Jeff Brown <jeffbrown@google.com> 1354660823 -0800

Pin electron beam surface to natural orientation.

If a rotation occurred while the electron beam surface was showing,
the surface may have appeared in the wrong orientation.  We fix this
problem by adjusting the transformation matrix of the electron beam
surface according to the display orientation whenever a display
transaction occurs.

The rotation itself is allowed to proceed but it is not visible
to the user.  We must let this happen so that the lock screen
is correctly oriented when the screen is turned back on.

Note that the electron beam surface serves two purposes.

First, it is used to play the screen off animation.
When the animation is finished, the surface remains visible but is
solid black.  Then we turn the screen off.

Second, when we turn the screen back on we leave the electron beam
surface showing until the window manager is ready to show the
new content.  This prevents the user from seeing a flash of the
old content while the screen is being turned on.  When everything is
ready, we dismiss the electron beam.

It's important for the electron beam to remain visible for
the entire duration from just before the screen is turned off until
after the screen is turned on and is ready to be seen.  This is
why we cannot fix the bug by deferring rotation or otherwise
getting in the way of the window manager doing what it needs
to do to get the screen ready when the screen is turned on again.

Bug: 7479740
Change-Id: I2fcf35114ad9b2e00fdfc67793be6df62c8dc4c3