Fix seamless rotation with SurfaceView WM bypass.
First a brief review on seamless rotation. In seamless rotation
the WM will do the following atomically:
1. Update the display transform.
2. Set window transforms to make the surfaces at their old size appear
at the correct location in the new coordinate space.
3. Set a flag to undo the transforms when the surfaces resize.
However, windows with NATIVE_WINDOW_TRANSFORM_DISPLAY needed to be special cased.
The flag will perform step 2 in terms of buffer mapping, but not in terms of bounds
computation. So to compensate the WM would apply the transform to the bounds,
set these bounds, and then skip applying the transform matrix (as the buffer is
transformed by the flag).
Now that the WM can't see the Camera view, it can't implement this special logic
and the Camera view inherits the parent transform. We compensate for this in
SurfaceFlinger by omitting parent rotation transform components for
Surfaces with NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY. To some extent this
breaks arbitrary rotation for surfaces with NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY
but this is essentially ok:
1. We lived with that bug until N-MR1
2. We fixed it in N-MR1 because the camera was falling back to ROTATE
a lot which shouldn't be happening anymore, following introduction
of specifying rotation animation in manifest.
Test: Rotate camera, disable HWC, rotate camera some more. Switch to front camera, repeat.
Bug: 36230754
Bug: 36727915
Change-Id: Ied390c9cb3968fcce32a84ee7947f699746fdc81
9 files changed