liboverlay: Rotator-assisted MDP downscaling of videos.
Engage the rotator to assist MDP in performing video downscale for
primary and external. This saves bandwidth and avoids causing the
driver to make too many panel mode switches between BLT (writeback)
and non-BLT (direct) modes.
Change-Id: Icfabc2c0f978a23cf96c78a9976cf69cea697b5f
CRs-Fixed: 434852
diff --git a/liboverlay/overlayMdp.cpp b/liboverlay/overlayMdp.cpp
index 48630a5..12ff8a9 100644
--- a/liboverlay/overlayMdp.cpp
+++ b/liboverlay/overlayMdp.cpp
@@ -111,19 +111,22 @@
return true;
}
-bool MdpCtrl::setTransform(const utils::eTransform& orient,
- const bool& rotUsed) {
+bool MdpCtrl::setTransform(const utils::eTransform& orient) {
int rot = utils::getMdpOrient(orient);
setUserData(rot);
//getMdpOrient will switch the flips if the source is 90 rotated.
//Clients in Android dont factor in 90 rotation while deciding the flip.
mOrientation = static_cast<utils::eTransform>(rot);
- //Rotator can be requested by client even if layer has 0 orientation.
- mRotUsed = rotUsed;
return true;
}
+void MdpCtrl::setRotatorUsed(const bool& rotUsed) {
+ //rotUsed dictates whether rotator hardware can be used.
+ //It is set if transformation or downscaling is required.
+ mRotUsed = rotUsed;
+}
+
void MdpCtrl::doTransform() {
adjustSrcWhf(mRotUsed);
setRotationFlags();
@@ -140,9 +143,52 @@
}
}
+int MdpCtrl::getDownscalefactor() {
+ int dscale_factor = utils::ROT_DS_NONE;
+ int src_w = mOVInfo.src_rect.w;
+ int src_h = mOVInfo.src_rect.h;
+ int dst_w = mOVInfo.dst_rect.w;
+ int dst_h = mOVInfo.dst_rect.h;
+ // We need this check to engage the rotator whenever possible to assist MDP
+ // in performing video downscale.
+ // This saves bandwidth and avoids causing the driver to make too many panel
+ // -mode switches between BLT (writeback) and non-BLT (Direct) modes.
+ // Use-case: Video playback [with downscaling and rotation].
+
+ if (dst_w && dst_h)
+ {
+ uint32_t dscale = (src_w * src_h) / (dst_w * dst_h);
+
+ if(dscale < 2) {
+ // Down-scale to > 50% of orig.
+ dscale_factor = utils::ROT_DS_NONE;
+ } else if(dscale < 4) {
+ // Down-scale to between > 25% to <= 50% of orig.
+ dscale_factor = utils::ROT_DS_HALF;
+ } else if(dscale < 8) {
+ // Down-scale to between > 12.5% to <= 25% of orig.
+ dscale_factor = utils::ROT_DS_FOURTH;
+ } else {
+ // Down-scale to <= 12.5% of orig.
+ dscale_factor = utils::ROT_DS_EIGHTH;
+ }
+ }
+
+ return dscale_factor;
+}
+
+void MdpCtrl::doDownscale(int dscale_factor) {
+
+ if( dscale_factor ) {
+ mOVInfo.src_rect.x >>= dscale_factor;
+ mOVInfo.src_rect.y >>= dscale_factor;
+ mOVInfo.src_rect.w >>= dscale_factor;
+ mOVInfo.src_rect.h >>= dscale_factor;
+ }
+}
+
bool MdpCtrl::set() {
//deferred calcs, so APIs could be called in any order.
- doTransform();
utils::Whf whf = getSrcWhf();
if(utils::isYuv(whf.format)) {
normalizeCrop(mOVInfo.src_rect.x, mOVInfo.src_rect.w);