Fix an coordinate issue with CopyToFrameBuffer

CopyToFrameBuffer was not correctly specifying the upper left
corner of the upper left pixel. Specifically a pixel has four
coordinates in floating point defined by its four corners.

Change-Id: Iba81e4a26efce4795dc784c2fe5b1f72cb2c3ca3
Minor compiler cleanup

Change-Id: I51ae210e6fb0c2a90519a60e1146310354031f2c
Merge topic 'mac_depth_peeling' into master

03efa724 Minor compiler cleanup
ed60226b Fix an coordinate issue with CopyToFrameBuffer