hwc: Add GPU-preferred and MDP-preferred modes to load based comp.
GPU's perf is proportional to the number of pixels it processes, so
the load based strategy that prefers GPU, attempts to load it less
in terms of pixels, and at the same time makes sure the MDP has
enough pipes and mixer stages.
MDP's perf is real time and proportional to the instantaneous b/w
which is a function of overlaps. So the load based strategy that
prefers MDP would look at sending only as many full-screen layers
that MDP could support.
This mode is used when the GPU-preferred mode fails.
Change-Id: I3221a94bb01c43112370c248cd4ab217f2bd8ed1
2 files changed