Merge "SF: fix BufferTX counter for null buffers" into sc-dev am: 90b688e087

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15240586

Change-Id: Ib4b14063dd4a2f8c8b3919cf27d8b84c8a9ee9bd
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index e65c721..2d99fc1 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -562,6 +562,10 @@
     return (what & layer_state_t::eBufferChanged) || (what & layer_state_t::eCachedBufferChanged);
 }
 
+bool layer_state_t::hasValidBuffer() const {
+    return buffer || cachedBuffer.isValid();
+}
+
 status_t layer_state_t::matrix22_t::write(Parcel& output) const {
     SAFE_PARCEL(output.writeFloat, dsdx);
     SAFE_PARCEL(output.writeFloat, dtdx);
diff --git a/libs/gui/include/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
index 8ac1e5d..465e34c 100644
--- a/libs/gui/include/gui/LayerState.h
+++ b/libs/gui/include/gui/LayerState.h
@@ -126,6 +126,7 @@
     status_t write(Parcel& output) const;
     status_t read(const Parcel& input);
     bool hasBufferChanges() const;
+    bool hasValidBuffer() const;
 
     struct matrix22_t {
         float dsdx{0};
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 0c23dc1..ea23263 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -6858,7 +6858,7 @@
 void SurfaceFlinger::TransactionState::traverseStatesWithBuffers(
         std::function<void(const layer_state_t&)> visitor) {
     for (const auto& state : states) {
-        if (state.state.hasBufferChanges() && (state.state.surface)) {
+        if (state.state.hasBufferChanges() && state.state.hasValidBuffer() && state.state.surface) {
             visitor(state.state);
         }
     }