Fix brightness change during screenrotation am: 1dadaa6b78

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24108563

Change-Id: Ib77c172ae28c406cce8985061aae93df5ad92d8d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index d3489ff805..faa8956108 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -7352,7 +7352,10 @@ ftl::SharedFuture<FenceResult> SurfaceFlinger::renderScreenImpl(
                                       renderArea->getHintForSeamlessTransition());
             sdrWhitePointNits = state.sdrWhitePointNits;
             displayBrightnessNits = state.displayBrightnessNits;
-            if (sdrWhitePointNits > 1.0f) {
+            // Only clamp the display brightness if this is not a seamless transition. Otherwise
+            // for seamless transitions it's important to match the current display state as the
+            // buffer will be shown under these same conditions, and we want to avoid any flickers
+            if (sdrWhitePointNits > 1.0f && !renderArea->getHintForSeamlessTransition()) {
                 // Restrict the amount of HDR "headroom" in the screenshot to avoid over-dimming
                 // the SDR portion. 2.0 chosen by experimentation
                 constexpr float kMaxScreenshotHeadroom = 2.0f;