Fix wrong framebufferspace computation

When the framebuffer size is 1/2 of the display
we were multiplying with 2 instead of dividing
when computing the content.

Bug: 161793589
Bug: 168788659
Test: atest OutputTest
Change-Id: I3bba764e87a1a5e9c4491d9f2f117b6c1f51371d
3 files changed