overlay: Add support for rotator downscale
Add support for rotator downscale. This is enabled from 8994 onwards
Constraints:
--Downscale should be a power of 2, max upto 32
--Both directions should have equal downscale
--{src_w, src_h} mod downscale = 0
--No BWC
--No Interlaced video support
The rotator's destination rect is modified to reflect the presence of
downscale. Any downscale calcs should be done only after adjusting
crop to meet rotator's requirements.
Smaller downscale is used if we need to chop off any more than 1
line or pixel.
Change-Id: Id07d62fefa3213035f16cca49497800716484a95
diff --git a/liboverlay/overlayMdpRot.cpp b/liboverlay/overlayMdpRot.cpp
index bb985d7..6105736 100755
--- a/liboverlay/overlayMdpRot.cpp
+++ b/liboverlay/overlayMdpRot.cpp
@@ -17,6 +17,7 @@
* limitations under the License.
*/
+#include <math.h>
#include "overlayUtils.h"
#include "overlayRotator.h"
#include "gr.h"
@@ -274,4 +275,35 @@
ovutils::getDump(buf, len, "MdpRotData", mRotDataInfo);
}
+int MdpRot::getDownscaleFactor(const int& src_w, const int& src_h,
+ const int& dst_w, const int& dst_h, const uint32_t& /*mdpFormat*/,
+ const bool& /*isInterlaced*/) {
+ int dscale_factor = utils::ROT_DS_NONE;
+ // 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)
+ {
+ float fDscale = (float)(src_w * src_h) / (float)(dst_w * dst_h);
+ uint32_t dscale = (int)sqrtf(fDscale);
+
+ 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;
+}
+
} // namespace overlay