Re-land: Make window stable while resizing
When the frame size and the frame position of the window are changed at
the same time, setPosition to the surface will be applied first, and
the client will draw on the new-size buffer later, which makes the
window flicker.
This CL uses applyWithNextDraw to make the new surface position can be
applied while the new frame is drawn. applyWithNextDraw is applied only
when
- the window doesn't have a move animation. So if a window needs to make
resizing stable, it may need PRIVATE_FLAG_NO_MOVE_ANIMATION.
- it is visible, e.g., the surface is shown, and the window is OK to
display -- for better performance.
If applyWithNextDraw is used while the window frame is changed to an
empty rectangle, e.g., Rect(10, 10 - 1000, 10), mNextDrawUseBlastSync
will stay true forever, because we don't draw while the dirty area is
empty, and ViewRootImpl would lose the only chance to clear the flag.
performTraversals will never be executed.
This CL makes mNextDrawUseBlastSync can be cleared in that case.
Bug: 182729646
Fix: 176874720
Test: steps in the bug
Change-Id: I81b0574ee8db7e4d9053639f56e04858d9feae90
6 files changed