ASurfaceTransaction: Add setEnableBackpressure

Expose the backpressure flag to NDK. See comment in
header file for extensive discussion.

Bug: 177458703
Test: Need new CTS
Change-Id: I97cdaef5d499f57a270972f001517b8a520aa2fe

1 files changed, 14 insertions, 0 deletions

diff --git a/native/android/surface_control.cpp b/native/android/surface_control.cpp
index 195fd5e60295..8b60480bfe73 100644
--- a/native/android/surface_control.cpp
+++ b/native/android/surface_control.cpp
@@ -655,3 +655,17 @@ void ASurfaceTransaction_setFrameRateWithSeamlessness(ASurfaceTransaction* aSurf
     sp<SurfaceControl> surfaceControl = ASurfaceControl_to_SurfaceControl(aSurfaceControl);
     transaction->setFrameRate(surfaceControl, frameRate, compatibility, shouldBeSeamless);
 }
+
+void ASurfaceTransaction_setEnableBackPressure(ASurfaceTransaction* aSurfaceTransaction,
+                                               ASurfaceControl* aSurfaceControl,
+                                               bool enableBackpressure) {
+    CHECK_NOT_NULL(aSurfaceControl);
+    CHECK_NOT_NULL(aSurfaceTransaction);
+
+    sp<SurfaceControl> surfaceControl = ASurfaceControl_to_SurfaceControl(aSurfaceControl);
+    Transaction* transaction = ASurfaceTransaction_to_Transaction(aSurfaceTransaction);
+
+    const uint32_t flags = enableBackpressure ?
+                      layer_state_t::eEnableBackpressure : 0;
+    transaction->setFlags(surfaceControl, flags, layer_state_t::eEnableBackpressure);
+}