Add sysprop to control HDR headroom

To accelerate tuning of the value allow it to be sysprop driven

Bug: 273624684
Test: change prop, verify silkfx headroom changes after re-launch
Change-Id: Ibad662b7ba06bd821c7a3ce48c19f4c94c716b5e

1 files changed, 7 insertions, 0 deletions

diff --git a/libs/hwui/Properties.cpp b/libs/hwui/Properties.cpp
index b0896daee2a1..9df6822b4867 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -91,6 +91,8 @@ bool Properties::isHighEndGfx = true;
 bool Properties::isLowRam = false;
 bool Properties::isSystemOrPersistent = false;
 
+float Properties::maxHdrHeadroomOn8bit = 5.f;  // TODO: Refine this number
+
 StretchEffectBehavior Properties::stretchEffectBehavior = StretchEffectBehavior::ShaderHWUI;
 
 DrawingEnabled Properties::drawingEnabled = DrawingEnabled::NotInitialized;
@@ -150,6 +152,11 @@ bool Properties::load() {
 
     enableWebViewOverlays = base::GetBoolProperty(PROPERTY_WEBVIEW_OVERLAYS_ENABLED, true);
 
+    auto hdrHeadroom = (float)atof(base::GetProperty(PROPERTY_8BIT_HDR_HEADROOM, "").c_str());
+    if (hdrHeadroom >= 1.f) {
+        maxHdrHeadroomOn8bit = std::min(hdrHeadroom, 100.f);
+    }
+
     // call isDrawingEnabled to force loading of the property
     isDrawingEnabled();