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
diff --git a/libhwcomposer/hwc_mdpcomp.h b/libhwcomposer/hwc_mdpcomp.h
index 5856946..adf74bb 100644
--- a/libhwcomposer/hwc_mdpcomp.h
+++ b/libhwcomposer/hwc_mdpcomp.h
@@ -147,8 +147,16 @@
bool partialMDPComp(hwc_context_t *ctx, hwc_display_contents_1_t* list);
/* Partial MDP comp that uses caching to save power as primary goal */
bool cacheBasedComp(hwc_context_t *ctx, hwc_display_contents_1_t* list);
- /* Partial MDP comp that uses number of pixels to optimize perf goal */
- bool loadBasedComp(hwc_context_t *ctx, hwc_display_contents_1_t* list);
+ /* Partial MDP comp that prefers GPU perf-wise. Since the GPU's
+ * perf is proportional to the pixels it processes, we use the number of
+ * pixels as a heuristic */
+ bool loadBasedCompPreferGPU(hwc_context_t *ctx,
+ hwc_display_contents_1_t* list);
+ /* Partial MDP comp that prefers MDP perf-wise. Since the MDP's perf is
+ * proportional to the bandwidth, overlaps it sees, we use that as a
+ * heuristic */
+ bool loadBasedCompPreferMDP(hwc_context_t *ctx,
+ hwc_display_contents_1_t* list);
/* Checks if its worth doing load based partial comp */
bool isLoadBasedCompDoable(hwc_context_t *ctx,
hwc_display_contents_1_t* list);