Add support for restricting HDR headroom for video

This is needed for allowing apps to vote for HDR headroom restrictions
for SurfaceView and SurfaceControl

Bug: 323964760
Test: manually poking at test app
Test: SurfaceViewTests
Test: SurfaceControlTest
Test: ASurfaceControlTest
Change-Id: Ie886e67879525462d49fdedc535aea659d69321a

1 files changed, 15 insertions, 0 deletions

diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 219a8e20a4..736fec6fb2 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -3395,6 +3395,14 @@ bool Layer::setExtendedRangeBrightness(float currentBufferRatio, float desiredRa
     return true;
 }
 
+bool Layer::setDesiredHdrHeadroom(float desiredRatio) {
+    if (mDrawingState.desiredHdrSdrRatio == desiredRatio) return false;
+    mDrawingState.desiredHdrSdrRatio = desiredRatio;
+    mDrawingState.modified = true;
+    setTransactionFlags(eTransactionNeeded);
+    return true;
+}
+
 bool Layer::setCachingHint(gui::CachingHint cachingHint) {
     if (mDrawingState.cachingHint == cachingHint) return false;
     mDrawingState.cachingHint = cachingHint;
@@ -3991,6 +3999,13 @@ bool Layer::isSimpleBufferUpdate(const layer_state_t& s) const {
         }
     }
 
+    if (s.what & layer_state_t::eDesiredHdrHeadroomChanged) {
+        if (mDrawingState.desiredHdrSdrRatio != s.desiredHdrSdrRatio) {
+            ATRACE_FORMAT_INSTANT("%s: false [eDesiredHdrHeadroomChanged changed]", __func__);
+            return false;
+        }
+    }
+
     return true;
 }