commit f57c0163f9c6fe8596a56df52a98f3f912f40ef5
author Robert Carr <racarr@google.com> Wed Mar 24 15:48:25 2021 -0700
committer Rob Carr <racarr@google.com> Thu Apr 01 19:41:40 2021 +0000
tree 8896745119a8484825f1e9e0d972f29058d85daf
parent 0f97905040606c3bba2f90d9dba33c16cb76873a

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

native/android/libandroid.map.txt

diff --git a/native/android/libandroid.map.txt b/native/android/libandroid.map.txt
index 35249f6..d2358b7 100644
--- a/native/android/libandroid.map.txt
+++ b/native/android/libandroid.map.txt
@@ -252,6 +252,7 @@
     ASurfaceTransaction_setColor; # introduced=29
     ASurfaceTransaction_setDamageRegion; # introduced=29
     ASurfaceTransaction_setDesiredPresentTime; # introduced=29
+    ASurfaceTransaction_setEnableBackPressure; # introduced=31
     ASurfaceTransaction_setFrameRate; # introduced=30
     ASurfaceTransaction_setFrameRateWithSeamlessness; # introduced=31
     ASurfaceTransaction_setGeometry; # introduced=29

native/android/surface_control.cpp

diff --git a/native/android/surface_control.cpp b/native/android/surface_control.cpp
index 195fd5e..8b60480 100644
--- a/native/android/surface_control.cpp
+++ b/native/android/surface_control.cpp
@@ -655,3 +655,17 @@
     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);
+}