hwc: Add BWC policy manager
Add a BWC policy manager that decides if BWC needs to be disabled on
certain conditions.
These conditions are statically determined. BWC might get used and
still fail (or cause failure of subsequent pipe requests) if SMP
blocks are not sufficient.
Change-Id: I805738911a8da7dfc6232c133c74ef844c3af5b1
diff --git a/liboverlay/overlayUtils.cpp b/liboverlay/overlayUtils.cpp
index 4b81ed3..9bfa34e 100644
--- a/liboverlay/overlayUtils.cpp
+++ b/liboverlay/overlayUtils.cpp
@@ -244,6 +244,27 @@
return dscale_factor;
}
+//Since this is unavailable on Android, defining it in terms of base 10
+static inline float log2f(const float& x) {
+ return log(x) / log(2);
+}
+
+void getDecimationFactor(const int& src_w, const int& src_h,
+ const int& dst_w, const int& dst_h, float& horDscale,
+ float& verDscale) {
+ horDscale = ceilf((float)src_w / (float)dst_w);
+ verDscale = ceilf((float)src_h / (float)dst_h);
+
+ //Next power of 2, if not already
+ horDscale = powf(2.0f, ceilf(log2f(horDscale)));
+ verDscale = powf(2.0f, ceilf(log2f(verDscale)));
+
+ //Since MDP can do 1/4 dscale and has better quality, split the task
+ //between decimator and MDP downscale
+ horDscale /= 4.0f;
+ verDscale /= 4.0f;
+}
+
static inline int compute(const uint32_t& x, const uint32_t& y,
const uint32_t& z) {
return x - ( y + z );